cgram.y revision 1.344
1 %{ 2 /* $NetBSD: cgram.y,v 1.344 2021/07/25 19:27:26 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) && !defined(lint) 38 __RCSID("$NetBSD: cgram.y,v 1.344 2021/07/25 19:27:26 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 int 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 static int olwarn = LWARN_BAD; 68 69 static void cgram_declare(sym_t *, bool, sbuf_t *); 70 static void read_until_rparen(void); 71 static sym_t *symbolrename(sym_t *, sbuf_t *); 72 73 74 #ifdef DEBUG 75 static void 76 CLEAR_WARN_FLAGS(const char *file, size_t line) 77 { 78 printf("%s:%d: %s:%zu: clearing flags\n", 79 curr_pos.p_file, curr_pos.p_line, file, line); 80 clear_warn_flags(); 81 olwarn = LWARN_BAD; 82 } 83 84 static void 85 SAVE_WARN_FLAGS(const char *file, size_t line) 86 { 87 lint_assert(olwarn == LWARN_BAD); 88 printf("%s:%d: %s:%zu: saving flags %d\n", 89 curr_pos.p_file, curr_pos.p_line, file, line, lwarn); 90 olwarn = lwarn; 91 } 92 93 static void 94 RESTORE_WARN_FLAGS(const char *file, size_t line) 95 { 96 if (olwarn != LWARN_BAD) { 97 lwarn = olwarn; 98 printf("%s:%d: %s:%zu: restoring flags %d\n", 99 curr_pos.p_file, curr_pos.p_line, file, line, lwarn); 100 olwarn = LWARN_BAD; 101 } else 102 CLEAR_WARN_FLAGS(file, line); 103 } 104 #define cgram_debug(fmt, args...) printf("cgram_debug: " fmt "\n", ##args) 105 #else 106 #define CLEAR_WARN_FLAGS(f, l) clear_warn_flags(), olwarn = LWARN_BAD 107 #define SAVE_WARN_FLAGS(f, l) olwarn = lwarn 108 #define RESTORE_WARN_FLAGS(f, l) \ 109 (void)(olwarn == LWARN_BAD ? (clear_warn_flags(), 0) : (lwarn = olwarn)) 110 #define cgram_debug(fmt, args...) do { } while (false) 111 #endif 112 113 #define clear_warning_flags() CLEAR_WARN_FLAGS(__FILE__, __LINE__) 114 #define save_warning_flags() SAVE_WARN_FLAGS(__FILE__, __LINE__) 115 #define restore_warning_flags() RESTORE_WARN_FLAGS(__FILE__, __LINE__) 116 117 /* unbind the anonymous struct members from the struct */ 118 static void 119 anonymize(sym_t *s) 120 { 121 for ( ; s != NULL; s = s->s_next) 122 s->s_styp = NULL; 123 } 124 125 %} 126 127 %expect 150 128 129 %union { 130 val_t *y_val; 131 sbuf_t *y_name; 132 sym_t *y_sym; 133 op_t y_op; 134 scl_t y_scl; 135 tspec_t y_tspec; 136 tqual_t y_tqual; 137 type_t *y_type; 138 tnode_t *y_tnode; 139 range_t y_range; 140 strg_t *y_string; 141 qual_ptr *y_qual_ptr; 142 bool y_seen_statement; 143 struct generic_association *y_generic; 144 }; 145 146 %token T_LBRACE T_RBRACE T_LBRACK T_RBRACK T_LPAREN T_RPAREN 147 %token T_POINT T_ARROW 148 %token T_COMPLEMENT T_LOGNOT 149 %token <y_op> T_INCDEC 150 %token T_SIZEOF 151 %token T_BUILTIN_OFFSETOF 152 %token T_TYPEOF 153 %token T_EXTENSION 154 %token T_ALIGNAS 155 %token T_ALIGNOF 156 %token T_ASTERISK 157 %token <y_op> T_MULTIPLICATIVE 158 %token <y_op> T_ADDITIVE 159 %token <y_op> T_SHIFT 160 %token <y_op> T_RELATIONAL 161 %token <y_op> T_EQUALITY 162 %token T_AMPER 163 %token T_BITXOR 164 %token T_BITOR 165 %token T_LOGAND 166 %token T_LOGOR 167 %token T_QUEST 168 %token T_COLON 169 %token T_ASSIGN 170 %token <y_op> T_OPASSIGN 171 %token T_COMMA 172 %token T_SEMI 173 %token T_ELLIPSIS 174 %token T_REAL 175 %token T_IMAG 176 %token T_GENERIC 177 %token T_NORETURN 178 179 /* storage classes (extern, static, auto, register and typedef) */ 180 %token <y_scl> T_SCLASS 181 182 /* 183 * predefined type keywords (char, int, short, long, unsigned, signed, 184 * float, double, void); see T_TYPENAME for types from typedef 185 */ 186 %token <y_tspec> T_TYPE 187 188 /* qualifiers (const, volatile, restrict, _Thread_local) */ 189 %token <y_tqual> T_QUAL 190 191 /* struct or union */ 192 %token <y_tspec> T_STRUCT_OR_UNION 193 194 /* remaining keywords */ 195 %token T_ASM 196 %token T_BREAK 197 %token T_CASE 198 %token T_CONTINUE 199 %token T_DEFAULT 200 %token T_DO 201 %token T_ELSE 202 %token T_ENUM 203 %token T_FOR 204 %token T_GOTO 205 %token T_IF 206 %token T_PACKED 207 %token T_RETURN 208 %token T_SWITCH 209 %token T_SYMBOLRENAME 210 %token T_WHILE 211 212 %token T_ATTRIBUTE 213 %token T_AT_ALIAS 214 %token T_AT_ALIGNED 215 %token T_AT_ALLOC_SIZE 216 %token T_AT_ALWAYS_INLINE 217 %token T_AT_BOUNDED 218 %token T_AT_BUFFER 219 %token T_AT_COLD 220 %token T_AT_COMMON 221 %token T_AT_CONSTRUCTOR 222 %token T_AT_DEPRECATED 223 %token T_AT_DESTRUCTOR 224 %token T_AT_FALLTHROUGH 225 %token T_AT_FORMAT 226 %token T_AT_FORMAT_ARG 227 %token T_AT_FORMAT_GNU_PRINTF 228 %token T_AT_FORMAT_PRINTF 229 %token T_AT_FORMAT_SCANF 230 %token T_AT_FORMAT_STRFMON 231 %token T_AT_FORMAT_STRFTIME 232 %token T_AT_FORMAT_SYSLOG 233 %token T_AT_GNU_INLINE 234 %token T_AT_HOT 235 %token T_AT_MALLOC 236 %token T_AT_MAY_ALIAS 237 %token T_AT_MINBYTES 238 %token T_AT_MODE 239 %token T_AT_NOINLINE 240 %token T_AT_NONNULL 241 %token T_AT_NONSTRING 242 %token T_AT_NORETURN 243 %token T_AT_NOTHROW 244 %token T_AT_NO_INSTRUMENT_FUNCTION 245 %token T_AT_OPTIMIZE 246 %token T_AT_PACKED 247 %token T_AT_PCS 248 %token T_AT_PURE 249 %token T_AT_RETURNS_TWICE 250 %token T_AT_SECTION 251 %token T_AT_SENTINEL 252 %token T_AT_STRING 253 %token T_AT_TLS_MODEL 254 %token T_AT_TUNION 255 %token T_AT_UNUSED 256 %token T_AT_USED 257 %token T_AT_VISIBILITY 258 %token T_AT_WARN_UNUSED_RESULT 259 %token T_AT_WEAK 260 261 %left T_THEN 262 %left T_ELSE 263 %left T_COMMA 264 %right T_ASSIGN T_OPASSIGN 265 %right T_QUEST T_COLON 266 %left T_LOGOR 267 %left T_LOGAND 268 %left T_BITOR 269 %left T_BITXOR 270 %left T_AMPER 271 %left T_EQUALITY 272 %left T_RELATIONAL 273 %left T_SHIFT 274 %left T_ADDITIVE 275 %left T_ASTERISK T_MULTIPLICATIVE 276 277 %token <y_name> T_NAME 278 %token <y_name> T_TYPENAME 279 %token <y_val> T_CON 280 %token <y_string> T_STRING 281 282 %type <y_sym> identifier_sym 283 %type <y_name> identifier 284 %type <y_string> string 285 %type <y_string> string2 286 287 %type <y_tnode> primary_expression 288 %type <y_tnode> generic_selection 289 %type <y_generic> generic_assoc_list 290 %type <y_generic> generic_association 291 %type <y_tnode> postfix_expression 292 %type <y_tnode> gcc_statement_expr_list 293 %type <y_tnode> gcc_statement_expr_item 294 %type <y_op> point_or_arrow 295 %type <y_tnode> argument_expression_list 296 %type <y_tnode> unary_expression 297 %type <y_tnode> cast_expression 298 %type <y_tnode> conditional_expression 299 %type <y_tnode> assignment_expression 300 %type <y_tnode> expression_opt 301 %type <y_tnode> expression 302 %type <y_tnode> constant_expr 303 304 %type <y_type> begin_type_typespec 305 %type <y_type> type_specifier 306 %type <y_type> notype_type_specifier 307 %type <y_type> struct_or_union_specifier 308 %type <y_tspec> struct_or_union 309 %type <y_sym> braced_struct_declaration_list 310 %type <y_sym> struct_declaration_list_with_rbrace 311 %type <y_sym> struct_declaration_list 312 %type <y_sym> struct_declaration 313 %type <y_sym> notype_struct_declarators 314 %type <y_sym> type_struct_declarators 315 %type <y_sym> notype_struct_declarator 316 %type <y_sym> type_struct_declarator 317 %type <y_type> enum_specifier 318 %type <y_sym> enum_declaration 319 %type <y_sym> enums_with_opt_comma 320 %type <y_sym> enumerator_list 321 %type <y_sym> enumerator 322 %type <y_qual_ptr> type_qualifier 323 %type <y_qual_ptr> pointer 324 %type <y_qual_ptr> asterisk 325 %type <y_qual_ptr> type_qualifier_list_opt 326 %type <y_qual_ptr> type_qualifier_list 327 %type <y_sym> notype_declarator 328 %type <y_sym> type_declarator 329 %type <y_sym> notype_direct_declarator 330 %type <y_sym> type_direct_declarator 331 %type <y_sym> type_param_declarator 332 %type <y_sym> notype_param_declarator 333 %type <y_sym> direct_param_declarator 334 %type <y_sym> direct_notype_param_declarator 335 %type <y_sym> param_list 336 %type <y_tnode> array_size 337 %type <y_sym> identifier_list 338 %type <y_type> type_name 339 %type <y_sym> abstract_declaration 340 %type <y_sym> abstract_declarator 341 %type <y_sym> direct_abstract_declarator 342 %type <y_sym> abstract_decl_param_list 343 %type <y_sym> vararg_parameter_type_list 344 %type <y_sym> parameter_type_list 345 %type <y_sym> parameter_declaration 346 %type <y_range> range 347 %type <y_name> asm_or_symbolrename_opt 348 349 %type <y_seen_statement> block_item_list 350 %type <y_seen_statement> block_item 351 %type <y_tnode> do_while_expr 352 %type <y_sym> func_declarator 353 354 %% 355 356 program: 357 /* empty */ { 358 if (sflag) { 359 /* empty translation unit */ 360 error(272); 361 } else if (!tflag) { 362 /* empty translation unit */ 363 warning(272); 364 } 365 } 366 | translation_unit 367 ; 368 369 identifier_sym: /* helper for struct/union/enum */ 370 identifier { 371 $$ = getsym($1); 372 } 373 ; 374 375 /* K&R ???, C90 ???, C99 6.4.2.1, C11 ??? */ 376 identifier: 377 T_NAME { 378 cgram_debug("name '%s'", $1->sb_name); 379 $$ = $1; 380 } 381 | T_TYPENAME { 382 cgram_debug("typename '%s'", $1->sb_name); 383 $$ = $1; 384 } 385 ; 386 387 /* see C99 6.4.5, string literals are joined by 5.1.1.2 */ 388 string: 389 T_STRING 390 | T_STRING string2 { 391 $$ = cat_strings($1, $2); 392 } 393 ; 394 395 /* see C99 6.4.5, string literals are joined by 5.1.1.2 */ 396 string2: 397 T_STRING { 398 if (tflag) { 399 /* concatenated strings are illegal in traditional C */ 400 warning(219); 401 } 402 $$ = $1; 403 } 404 | string2 T_STRING { 405 $$ = cat_strings($1, $2); 406 } 407 ; 408 409 /* K&R 7.1, C90 ???, C99 6.5.1, C11 6.5.1 */ 410 primary_expression: 411 T_NAME { 412 /* XXX really necessary? */ 413 if (yychar < 0) 414 yychar = yylex(); 415 $$ = build_name(getsym($1), yychar); 416 } 417 | T_CON { 418 $$ = build_constant(gettyp($1->v_tspec), $1); 419 } 420 | string { 421 $$ = build_string($1); 422 } 423 | T_LPAREN expression T_RPAREN { 424 if ($2 != NULL) 425 $2->tn_parenthesized = true; 426 $$ = $2; 427 } 428 | generic_selection 429 /* GCC primary-expression, see c_parser_postfix_expression */ 430 | T_BUILTIN_OFFSETOF T_LPAREN type_name T_COMMA identifier T_RPAREN { 431 symtyp = FMEMBER; 432 $$ = build_offsetof($3, getsym($5)); 433 } 434 ; 435 436 /* K&R ---, C90 ---, C99 ---, C11 6.5.1.1 */ 437 generic_selection: 438 T_GENERIC T_LPAREN assignment_expression T_COMMA 439 generic_assoc_list T_RPAREN { 440 /* generic selection requires C11 or later */ 441 c11ism(345); 442 $$ = build_generic_selection($3, $5); 443 } 444 ; 445 446 /* K&R ---, C90 ---, C99 ---, C11 6.5.1.1 */ 447 generic_assoc_list: 448 generic_association 449 | generic_assoc_list T_COMMA generic_association { 450 $3->ga_prev = $1; 451 $$ = $3; 452 } 453 ; 454 455 /* K&R ---, C90 ---, C99 ---, C11 6.5.1.1 */ 456 generic_association: 457 type_name T_COLON assignment_expression { 458 $$ = getblk(sizeof(*$$)); 459 $$->ga_arg = $1; 460 $$->ga_result = $3; 461 } 462 | T_DEFAULT T_COLON assignment_expression { 463 $$ = getblk(sizeof(*$$)); 464 $$->ga_arg = NULL; 465 $$->ga_result = $3; 466 } 467 ; 468 469 /* K&R 7.1, C90 ???, C99 6.5.2, C11 6.5.2 */ 470 postfix_expression: 471 primary_expression 472 | postfix_expression T_LBRACK expression T_RBRACK { 473 $$ = build_unary(INDIR, build_binary($1, PLUS, $3)); 474 } 475 | postfix_expression T_LPAREN T_RPAREN { 476 $$ = build_function_call($1, NULL); 477 } 478 | postfix_expression T_LPAREN argument_expression_list T_RPAREN { 479 $$ = build_function_call($1, $3); 480 } 481 | postfix_expression point_or_arrow T_NAME { 482 $$ = build_member_access($1, $2, $3); 483 } 484 | postfix_expression T_INCDEC { 485 $$ = build_unary($2 == INC ? INCAFT : DECAFT, $1); 486 } 487 | T_LPAREN type_name T_RPAREN { /* C99 6.5.2.5 "Compound literals" */ 488 sym_t *tmp = mktempsym($2); 489 begin_initialization(tmp); 490 cgram_declare(tmp, true, NULL); 491 } init_lbrace initializer_list comma_opt init_rbrace { 492 if (!Sflag) 493 /* compound literals are a C9X/GCC extension */ 494 gnuism(319); 495 $$ = build_name(*current_initsym(), 0); 496 end_initialization(); 497 } 498 | T_LPAREN compound_statement_lbrace gcc_statement_expr_list { 499 block_level--; 500 mem_block_level--; 501 begin_initialization(mktempsym(dup_type($3->tn_type))); 502 mem_block_level++; 503 block_level++; 504 /* ({ }) is a GCC extension */ 505 gnuism(320); 506 } compound_statement_rbrace T_RPAREN { 507 $$ = build_name(*current_initsym(), 0); 508 end_initialization(); 509 } 510 ; 511 512 comma_opt: /* helper for 'postfix_expression' */ 513 /* empty */ 514 | T_COMMA 515 ; 516 517 /* 518 * The inner part of a GCC statement-expression of the form ({ ... }). 519 * 520 * https://gcc.gnu.org/onlinedocs/gcc/Statement-Exprs.html 521 */ 522 gcc_statement_expr_list: 523 gcc_statement_expr_item 524 | gcc_statement_expr_list gcc_statement_expr_item { 525 $$ = $2; 526 } 527 ; 528 529 gcc_statement_expr_item: 530 declaration_or_error { 531 clear_warning_flags(); 532 $$ = NULL; 533 } 534 | non_expr_statement { 535 $$ = expr_zalloc_tnode(); 536 $$->tn_type = gettyp(VOID); 537 } 538 | expression T_SEMI { 539 if ($1 == NULL) { /* in case of syntax errors */ 540 $$ = expr_zalloc_tnode(); 541 $$->tn_type = gettyp(VOID); 542 } else { 543 /* XXX: do that only on the last name */ 544 if ($1->tn_op == NAME) 545 $1->tn_sym->s_used = true; 546 expr($1, false, false, false, false); 547 seen_fallthrough = false; 548 $$ = $1; 549 } 550 } 551 ; 552 553 point_or_arrow: /* helper for 'postfix_expression' */ 554 T_POINT { 555 symtyp = FMEMBER; 556 $$ = POINT; 557 } 558 | T_ARROW { 559 symtyp = FMEMBER; 560 $$ = ARROW; 561 } 562 ; 563 564 /* K&R 7.1, C90 ???, C99 6.5.2, C11 6.5.2 */ 565 argument_expression_list: 566 assignment_expression { 567 $$ = build_function_argument(NULL, $1); 568 } 569 | argument_expression_list T_COMMA assignment_expression { 570 $$ = build_function_argument($1, $3); 571 } 572 ; 573 574 /* K&R 7.2, C90 ???, C99 6.5.3, C11 6.5.3 */ 575 unary_expression: 576 postfix_expression 577 | T_INCDEC unary_expression { 578 $$ = build_unary($1 == INC ? INCBEF : DECBEF, $2); 579 } 580 | T_AMPER cast_expression { 581 $$ = build_unary(ADDR, $2); 582 } 583 | T_ASTERISK cast_expression { 584 $$ = build_unary(INDIR, $2); 585 } 586 | T_ADDITIVE cast_expression { 587 if (tflag && $1 == PLUS) { 588 /* unary + is illegal in traditional C */ 589 warning(100); 590 } 591 $$ = build_unary($1 == PLUS ? UPLUS : UMINUS, $2); 592 } 593 | T_COMPLEMENT cast_expression { 594 $$ = build_unary(COMPL, $2); 595 } 596 | T_LOGNOT cast_expression { 597 $$ = build_unary(NOT, $2); 598 } 599 | T_REAL cast_expression { /* GCC c_parser_unary_expression */ 600 $$ = build_unary(REAL, $2); 601 } 602 | T_IMAG cast_expression { /* GCC c_parser_unary_expression */ 603 $$ = build_unary(IMAG, $2); 604 } 605 | T_EXTENSION cast_expression { /* GCC c_parser_unary_expression */ 606 $$ = $2; 607 } 608 | T_SIZEOF unary_expression { 609 $$ = $2 == NULL ? NULL : build_sizeof($2->tn_type); 610 if ($$ != NULL) 611 check_expr_misc($2, 612 false, false, false, false, false, true); 613 } 614 | T_SIZEOF T_LPAREN type_name T_RPAREN { 615 $$ = build_sizeof($3); 616 } 617 /* K&R ---, C90 ---, C99 ---, C11 6.5.3 */ 618 | T_ALIGNOF T_LPAREN type_name T_RPAREN { 619 /* TODO: c11ism */ 620 $$ = build_alignof($3); 621 } 622 ; 623 624 /* The rule 'unary_operator' is inlined into unary_expression. */ 625 626 /* K&R 7.2, C90 ???, C99 6.5.4, C11 6.5.4 */ 627 cast_expression: 628 unary_expression 629 | T_LPAREN type_name T_RPAREN cast_expression { 630 $$ = cast($4, $2); 631 } 632 ; 633 634 expression_opt: 635 /* empty */ { 636 $$ = NULL; 637 } 638 | expression 639 ; 640 641 /* 'conditional_expression' also implements 'multiplicative_expression'. */ 642 /* 'conditional_expression' also implements 'additive_expression'. */ 643 /* 'conditional_expression' also implements 'shift_expression'. */ 644 /* 'conditional_expression' also implements 'relational_expression'. */ 645 /* 'conditional_expression' also implements 'equality_expression'. */ 646 /* 'conditional_expression' also implements 'AND_expression'. */ 647 /* 'conditional_expression' also implements 'exclusive_OR_expression'. */ 648 /* 'conditional_expression' also implements 'inclusive_OR_expression'. */ 649 /* 'conditional_expression' also implements 'logical_AND_expression'. */ 650 /* 'conditional_expression' also implements 'logical_OR_expression'. */ 651 /* K&R ???, C90 ???, C99 6.5.5 to 6.5.15, C11 6.5.5 to 6.5.15 */ 652 conditional_expression: 653 cast_expression 654 | conditional_expression T_ASTERISK conditional_expression { 655 $$ = build_binary($1, MULT, $3); 656 } 657 | conditional_expression T_MULTIPLICATIVE conditional_expression { 658 $$ = build_binary($1, $2, $3); 659 } 660 | conditional_expression T_ADDITIVE conditional_expression { 661 $$ = build_binary($1, $2, $3); 662 } 663 | conditional_expression T_SHIFT conditional_expression { 664 $$ = build_binary($1, $2, $3); 665 } 666 | conditional_expression T_RELATIONAL conditional_expression { 667 $$ = build_binary($1, $2, $3); 668 } 669 | conditional_expression T_EQUALITY conditional_expression { 670 $$ = build_binary($1, $2, $3); 671 } 672 | conditional_expression T_AMPER conditional_expression { 673 $$ = build_binary($1, BITAND, $3); 674 } 675 | conditional_expression T_BITXOR conditional_expression { 676 $$ = build_binary($1, BITXOR, $3); 677 } 678 | conditional_expression T_BITOR conditional_expression { 679 $$ = build_binary($1, BITOR, $3); 680 } 681 | conditional_expression T_LOGAND conditional_expression { 682 $$ = build_binary($1, LOGAND, $3); 683 } 684 | conditional_expression T_LOGOR conditional_expression { 685 $$ = build_binary($1, LOGOR, $3); 686 } 687 | conditional_expression T_QUEST conditional_expression 688 T_COLON conditional_expression { 689 $$ = build_binary($1, QUEST, build_binary($3, COLON, $5)); 690 } 691 ; 692 693 /* K&R ???, C90 ???, C99 6.5.16, C11 6.5.16 */ 694 assignment_expression: 695 conditional_expression 696 | assignment_expression T_ASSIGN conditional_expression { 697 $$ = build_binary($1, ASSIGN, $3); 698 } 699 | assignment_expression T_OPASSIGN conditional_expression { 700 $$ = build_binary($1, $2, $3); 701 } 702 ; 703 704 /* K&R ???, C90 ???, C99 6.5.17, C11 6.5.17 */ 705 expression: 706 assignment_expression 707 | expression T_COMMA assignment_expression { 708 $$ = build_binary($1, COMMA, $3); 709 } 710 ; 711 712 constant_expr_list_opt: /* helper for gcc_attribute */ 713 /* empty */ 714 | constant_expr_list 715 ; 716 717 constant_expr_list: /* helper for gcc_attribute */ 718 constant_expr 719 | constant_expr_list T_COMMA constant_expr 720 ; 721 722 constant_expr: /* C99 6.6 */ 723 conditional_expression 724 ; 725 726 declaration_or_error: 727 declaration 728 | error T_SEMI 729 ; 730 731 declaration: /* C99 6.7 */ 732 begin_type_declmods end_type T_SEMI { 733 if (dcs->d_scl == TYPEDEF) { 734 /* typedef declares no type name */ 735 warning(72); 736 } else { 737 /* empty declaration */ 738 warning(2); 739 } 740 } 741 | begin_type_declmods end_type notype_init_declarators T_SEMI 742 /* ^^ There is no check for the missing type-specifier. */ 743 | begin_type_declaration_specifiers end_type T_SEMI { 744 if (dcs->d_scl == TYPEDEF) { 745 /* typedef declares no type name */ 746 warning(72); 747 } else if (!dcs->d_nonempty_decl) { 748 /* empty declaration */ 749 warning(2); 750 } 751 } 752 | begin_type_declaration_specifiers end_type 753 type_init_declarators T_SEMI 754 ; 755 756 begin_type_declaration_specifiers: /* see C99 6.7 */ 757 begin_type_typespec { 758 add_type($1); 759 } 760 | begin_type_declmods type_specifier { 761 add_type($2); 762 } 763 | type_attribute begin_type_declaration_specifiers 764 | begin_type_declaration_specifiers declmod 765 | begin_type_declaration_specifiers notype_type_specifier { 766 add_type($2); 767 } 768 ; 769 770 begin_type_declmods: /* see C99 6.7 */ 771 begin_type T_QUAL { 772 add_qualifier($2); 773 } 774 | begin_type T_SCLASS { 775 add_storage_class($2); 776 } 777 | begin_type_declmods declmod 778 ; 779 780 begin_type_specifier_qualifier_list: /* see C11 6.7.2.1 */ 781 begin_type_specifier_qualifier_list_postfix 782 | type_attribute_list begin_type_specifier_qualifier_list_postfix 783 ; 784 785 begin_type_specifier_qualifier_list_postfix: 786 begin_type_typespec { 787 add_type($1); 788 } 789 | begin_type_qualifier_list type_specifier { 790 add_type($2); 791 } 792 | begin_type_specifier_qualifier_list_postfix T_QUAL { 793 add_qualifier($2); 794 } 795 | begin_type_specifier_qualifier_list_postfix notype_type_specifier { 796 add_type($2); 797 } 798 | begin_type_specifier_qualifier_list_postfix type_attribute 799 ; 800 801 begin_type_typespec: 802 begin_type notype_type_specifier { 803 $$ = $2; 804 } 805 | T_TYPENAME begin_type { 806 $$ = getsym($1)->s_type; 807 } 808 ; 809 810 begin_type_qualifier_list: 811 begin_type T_QUAL { 812 add_qualifier($2); 813 } 814 | begin_type_qualifier_list T_QUAL { 815 add_qualifier($2); 816 } 817 ; 818 819 declmod: 820 T_QUAL { 821 add_qualifier($1); 822 } 823 | T_SCLASS { 824 add_storage_class($1); 825 } 826 | type_attribute_list 827 ; 828 829 type_attribute_list: 830 type_attribute 831 | type_attribute_list type_attribute 832 ; 833 834 type_attribute_opt: 835 /* empty */ 836 | type_attribute 837 ; 838 839 type_attribute: /* See C11 6.7 declaration-specifiers */ 840 gcc_attribute 841 /* TODO: c11ism */ 842 | T_ALIGNAS T_LPAREN align_as T_RPAREN 843 | T_PACKED { 844 addpacked(); 845 } 846 | T_NORETURN 847 ; 848 849 align_as: /* See alignment-specifier in C11 6.7.5 */ 850 type_specifier 851 | constant_expr 852 ; 853 854 begin_type: 855 /* empty */ { 856 begin_type(); 857 } 858 ; 859 860 end_type: 861 /* empty */ { 862 end_type(); 863 } 864 ; 865 866 type_specifier: /* C99 6.7.2 */ 867 notype_type_specifier 868 | T_TYPENAME { 869 $$ = getsym($1)->s_type; 870 } 871 ; 872 873 notype_type_specifier: /* see C99 6.7.2 */ 874 T_TYPE { 875 $$ = gettyp($1); 876 } 877 | T_TYPEOF T_LPAREN expression T_RPAREN { /* GCC extension */ 878 $$ = $3->tn_type; 879 } 880 | struct_or_union_specifier { 881 end_declaration_level(); 882 $$ = $1; 883 } 884 | enum_specifier { 885 end_declaration_level(); 886 $$ = $1; 887 } 888 ; 889 890 struct_or_union_specifier: /* C99 6.7.2.1 */ 891 struct_or_union identifier_sym { 892 /* 893 * STDC requires that "struct a;" always introduces 894 * a new tag if "a" is not declared at current level 895 * 896 * yychar is valid because otherwise the parser would not 897 * have been able to decide if it must shift or reduce 898 */ 899 $$ = mktag($2, $1, false, yychar == T_SEMI); 900 } 901 | struct_or_union identifier_sym { 902 dcs->d_tagtyp = mktag($2, $1, true, false); 903 } braced_struct_declaration_list { 904 $$ = complete_tag_struct_or_union(dcs->d_tagtyp, $4); 905 } 906 | struct_or_union { 907 dcs->d_tagtyp = mktag(NULL, $1, true, false); 908 } braced_struct_declaration_list { 909 $$ = complete_tag_struct_or_union(dcs->d_tagtyp, $3); 910 } 911 | struct_or_union error { 912 symtyp = FVFT; 913 $$ = gettyp(INT); 914 } 915 ; 916 917 struct_or_union: /* C99 6.7.2.1 */ 918 T_STRUCT_OR_UNION { 919 symtyp = FTAG; 920 begin_declaration_level($1 == STRUCT ? MOS : MOU); 921 dcs->d_offset = 0; 922 dcs->d_sou_align_in_bits = CHAR_SIZE; 923 $$ = $1; 924 } 925 | struct_or_union type_attribute 926 ; 927 928 braced_struct_declaration_list: /* see C99 6.7.2.1 */ 929 struct_declaration_lbrace struct_declaration_list_with_rbrace { 930 $$ = $2; 931 } 932 ; 933 934 struct_declaration_lbrace: /* see C99 6.7.2.1 */ 935 T_LBRACE { 936 symtyp = FVFT; 937 } 938 ; 939 940 struct_declaration_list_with_rbrace: /* see C99 6.7.2.1 */ 941 struct_declaration_list T_RBRACE 942 | T_RBRACE { 943 /* XXX: This is not allowed by any C standard. */ 944 $$ = NULL; 945 } 946 ; 947 948 struct_declaration_list: /* C99 6.7.2.1 */ 949 struct_declaration 950 | struct_declaration_list struct_declaration { 951 $$ = lnklst($1, $2); 952 } 953 ; 954 955 struct_declaration: /* C99 6.7.2.1 */ 956 begin_type_qualifier_list end_type { 957 /* ^^ There is no check for the missing type-specifier. */ 958 /* too late, i know, but getsym() compensates it */ 959 symtyp = FMEMBER; 960 } notype_struct_declarators type_attribute_opt T_SEMI { 961 symtyp = FVFT; 962 $$ = $4; 963 } 964 | begin_type_specifier_qualifier_list end_type { 965 symtyp = FMEMBER; 966 } type_struct_declarators type_attribute_opt T_SEMI { 967 symtyp = FVFT; 968 $$ = $4; 969 } 970 | begin_type_qualifier_list end_type type_attribute_opt T_SEMI { 971 /* syntax error '%s' */ 972 error(249, "member without type"); 973 $$ = NULL; 974 } 975 | begin_type_specifier_qualifier_list end_type type_attribute_opt 976 T_SEMI { 977 symtyp = FVFT; 978 if (!Sflag) 979 /* anonymous struct/union members is a C9X feature */ 980 warning(49); 981 if (is_struct_or_union(dcs->d_type->t_tspec)) { 982 $$ = dcs->d_type->t_str->sou_first_member; 983 /* add all the members of the anonymous struct/union */ 984 anonymize($$); 985 } else { 986 /* syntax error '%s' */ 987 error(249, "unnamed member"); 988 $$ = NULL; 989 } 990 } 991 | error T_SEMI { 992 symtyp = FVFT; 993 $$ = NULL; 994 } 995 ; 996 997 notype_struct_declarators: 998 notype_struct_declarator { 999 $$ = declarator_1_struct_union($1); 1000 } 1001 | notype_struct_declarators { 1002 symtyp = FMEMBER; 1003 } T_COMMA type_struct_declarator { 1004 $$ = lnklst($1, declarator_1_struct_union($4)); 1005 } 1006 ; 1007 1008 type_struct_declarators: 1009 type_struct_declarator { 1010 $$ = declarator_1_struct_union($1); 1011 } 1012 | type_struct_declarators { 1013 symtyp = FMEMBER; 1014 } T_COMMA type_struct_declarator { 1015 $$ = lnklst($1, declarator_1_struct_union($4)); 1016 } 1017 ; 1018 1019 notype_struct_declarator: 1020 notype_declarator 1021 | notype_declarator T_COLON constant_expr { /* C99 6.7.2.1 */ 1022 $$ = bitfield($1, to_int_constant($3, true)); 1023 } 1024 | { 1025 symtyp = FVFT; 1026 } T_COLON constant_expr { /* C99 6.7.2.1 */ 1027 $$ = bitfield(NULL, to_int_constant($3, true)); 1028 } 1029 ; 1030 1031 type_struct_declarator: 1032 type_declarator 1033 | type_declarator T_COLON constant_expr { 1034 $$ = bitfield($1, to_int_constant($3, true)); 1035 } 1036 | { 1037 symtyp = FVFT; 1038 } T_COLON constant_expr { 1039 $$ = bitfield(NULL, to_int_constant($3, true)); 1040 } 1041 ; 1042 1043 enum_specifier: /* C99 6.7.2.2 */ 1044 enum gcc_attribute_list_opt identifier_sym { 1045 $$ = mktag($3, ENUM, false, false); 1046 } 1047 | enum gcc_attribute_list_opt identifier_sym { 1048 dcs->d_tagtyp = mktag($3, ENUM, true, false); 1049 } enum_declaration /*gcc_attribute_list_opt*/ { 1050 $$ = complete_tag_enum(dcs->d_tagtyp, $5); 1051 } 1052 | enum gcc_attribute_list_opt { 1053 dcs->d_tagtyp = mktag(NULL, ENUM, true, false); 1054 } enum_declaration /*gcc_attribute_list_opt*/ { 1055 $$ = complete_tag_enum(dcs->d_tagtyp, $4); 1056 } 1057 | enum error { 1058 symtyp = FVFT; 1059 $$ = gettyp(INT); 1060 } 1061 ; 1062 1063 enum: /* helper for C99 6.7.2.2 */ 1064 T_ENUM { 1065 symtyp = FTAG; 1066 begin_declaration_level(CTCONST); 1067 } 1068 ; 1069 1070 enum_declaration: /* helper for C99 6.7.2.2 */ 1071 enum_decl_lbrace enums_with_opt_comma T_RBRACE { 1072 $$ = $2; 1073 } 1074 ; 1075 1076 enum_decl_lbrace: /* helper for C99 6.7.2.2 */ 1077 T_LBRACE { 1078 symtyp = FVFT; 1079 enumval = 0; 1080 } 1081 ; 1082 1083 enums_with_opt_comma: /* helper for C99 6.7.2.2 */ 1084 enumerator_list 1085 | enumerator_list T_COMMA { 1086 if (sflag) { 1087 /* trailing ',' prohibited in enum declaration */ 1088 error(54); 1089 } else { 1090 /* trailing ',' prohibited in enum declaration */ 1091 c99ism(54); 1092 } 1093 $$ = $1; 1094 } 1095 ; 1096 1097 enumerator_list: /* C99 6.7.2.2 */ 1098 enumerator 1099 | enumerator_list T_COMMA enumerator { 1100 $$ = lnklst($1, $3); 1101 } 1102 | error { 1103 $$ = NULL; 1104 } 1105 ; 1106 1107 enumerator: /* C99 6.7.2.2 */ 1108 identifier_sym gcc_attribute_list_opt { 1109 $$ = enumeration_constant($1, enumval, true); 1110 } 1111 | identifier_sym gcc_attribute_list_opt T_ASSIGN constant_expr { 1112 $$ = enumeration_constant($1, to_int_constant($4, true), 1113 false); 1114 } 1115 ; 1116 1117 type_qualifier: /* C99 6.7.3 */ 1118 T_QUAL { 1119 $$ = xcalloc(1, sizeof(*$$)); 1120 if ($1 == CONST) 1121 $$->p_const = true; 1122 if ($1 == VOLATILE) 1123 $$->p_volatile = true; 1124 } 1125 ; 1126 1127 pointer: /* C99 6.7.5 */ 1128 asterisk type_qualifier_list_opt { 1129 $$ = merge_qualified_pointer($1, $2); 1130 } 1131 | asterisk type_qualifier_list_opt pointer { 1132 $$ = merge_qualified_pointer($1, $2); 1133 $$ = merge_qualified_pointer($$, $3); 1134 } 1135 ; 1136 1137 asterisk: /* helper for 'pointer' */ 1138 T_ASTERISK { 1139 $$ = xcalloc(1, sizeof(*$$)); 1140 $$->p_pointer = true; 1141 } 1142 ; 1143 1144 type_qualifier_list_opt: /* see C99 6.7.5 */ 1145 /* empty */ { 1146 $$ = NULL; 1147 } 1148 | type_qualifier_list 1149 ; 1150 1151 type_qualifier_list: /* C99 6.7.5 */ 1152 type_qualifier 1153 | type_qualifier_list type_qualifier { 1154 $$ = merge_qualified_pointer($1, $2); 1155 } 1156 ; 1157 1158 /* 1159 * For an explanation of 'notype' in the following rules, see the Bison 1160 * manual, section 7.1 "Semantic Info in Token Kinds". 1161 */ 1162 1163 notype_init_declarators: 1164 notype_init_declarator 1165 | notype_init_declarators T_COMMA type_init_declarator 1166 ; 1167 1168 type_init_declarators: 1169 type_init_declarator 1170 | type_init_declarators T_COMMA type_init_declarator 1171 ; 1172 1173 notype_init_declarator: 1174 notype_declarator asm_or_symbolrename_opt { 1175 cgram_declare($1, false, $2); 1176 check_size($1); 1177 } 1178 | notype_declarator asm_or_symbolrename_opt { 1179 begin_initialization($1); 1180 cgram_declare($1, true, $2); 1181 } T_ASSIGN initializer { 1182 check_size($1); 1183 end_initialization(); 1184 } 1185 ; 1186 1187 type_init_declarator: 1188 type_declarator asm_or_symbolrename_opt { 1189 cgram_declare($1, false, $2); 1190 check_size($1); 1191 } 1192 | type_declarator asm_or_symbolrename_opt { 1193 begin_initialization($1); 1194 cgram_declare($1, true, $2); 1195 } T_ASSIGN initializer { 1196 check_size($1); 1197 end_initialization(); 1198 } 1199 ; 1200 1201 notype_declarator: 1202 notype_direct_declarator 1203 | pointer notype_direct_declarator { 1204 $$ = add_pointer($2, $1); 1205 } 1206 ; 1207 1208 type_declarator: 1209 type_direct_declarator 1210 | pointer type_direct_declarator { 1211 $$ = add_pointer($2, $1); 1212 } 1213 ; 1214 1215 notype_direct_declarator: 1216 T_NAME { 1217 $$ = declarator_name(getsym($1)); 1218 } 1219 | T_LPAREN type_declarator T_RPAREN { 1220 $$ = $2; 1221 } 1222 | type_attribute notype_direct_declarator { 1223 $$ = $2; 1224 } 1225 | notype_direct_declarator T_LBRACK T_RBRACK { 1226 $$ = add_array($1, false, 0); 1227 } 1228 | notype_direct_declarator T_LBRACK array_size T_RBRACK { 1229 $$ = add_array($1, true, to_int_constant($3, false)); 1230 } 1231 | notype_direct_declarator param_list asm_or_symbolrename_opt { 1232 $$ = add_function(symbolrename($1, $3), $2); 1233 end_declaration_level(); 1234 block_level--; 1235 } 1236 | notype_direct_declarator type_attribute 1237 ; 1238 1239 type_direct_declarator: 1240 identifier { 1241 $$ = declarator_name(getsym($1)); 1242 } 1243 | T_LPAREN type_declarator T_RPAREN { 1244 $$ = $2; 1245 } 1246 | type_attribute type_direct_declarator { 1247 $$ = $2; 1248 } 1249 | type_direct_declarator T_LBRACK T_RBRACK { 1250 $$ = add_array($1, false, 0); 1251 } 1252 | type_direct_declarator T_LBRACK array_size T_RBRACK { 1253 $$ = add_array($1, true, to_int_constant($3, false)); 1254 } 1255 | type_direct_declarator param_list asm_or_symbolrename_opt { 1256 $$ = add_function(symbolrename($1, $3), $2); 1257 end_declaration_level(); 1258 block_level--; 1259 } 1260 | type_direct_declarator type_attribute 1261 ; 1262 1263 /* 1264 * The two distinct rules type_param_declarator and notype_param_declarator 1265 * avoid a conflict in argument lists. A typename enclosed in parentheses is 1266 * always treated as a typename, not an argument name. For example, after 1267 * "typedef double a;", the declaration "f(int (a));" is interpreted as 1268 * "f(int (double));", not "f(int a);". 1269 */ 1270 type_param_declarator: 1271 direct_param_declarator 1272 | pointer direct_param_declarator { 1273 $$ = add_pointer($2, $1); 1274 } 1275 ; 1276 1277 notype_param_declarator: 1278 direct_notype_param_declarator 1279 | pointer direct_notype_param_declarator { 1280 $$ = add_pointer($2, $1); 1281 } 1282 ; 1283 1284 direct_param_declarator: 1285 identifier type_attribute_list { 1286 $$ = declarator_name(getsym($1)); 1287 } 1288 | identifier { 1289 $$ = declarator_name(getsym($1)); 1290 } 1291 | T_LPAREN notype_param_declarator T_RPAREN { 1292 $$ = $2; 1293 } 1294 | direct_param_declarator T_LBRACK T_RBRACK { 1295 $$ = add_array($1, false, 0); 1296 } 1297 | direct_param_declarator T_LBRACK array_size T_RBRACK { 1298 $$ = add_array($1, true, to_int_constant($3, false)); 1299 } 1300 | direct_param_declarator param_list asm_or_symbolrename_opt { 1301 $$ = add_function(symbolrename($1, $3), $2); 1302 end_declaration_level(); 1303 block_level--; 1304 } 1305 ; 1306 1307 direct_notype_param_declarator: 1308 identifier { 1309 $$ = declarator_name(getsym($1)); 1310 } 1311 | T_LPAREN notype_param_declarator T_RPAREN { 1312 $$ = $2; 1313 } 1314 | direct_notype_param_declarator T_LBRACK T_RBRACK { 1315 $$ = add_array($1, false, 0); 1316 } 1317 | direct_notype_param_declarator T_LBRACK array_size T_RBRACK { 1318 $$ = add_array($1, true, to_int_constant($3, false)); 1319 } 1320 | direct_notype_param_declarator param_list asm_or_symbolrename_opt { 1321 $$ = add_function(symbolrename($1, $3), $2); 1322 end_declaration_level(); 1323 block_level--; 1324 } 1325 ; 1326 1327 param_list: 1328 id_list_lparen identifier_list T_RPAREN { 1329 $$ = $2; 1330 } 1331 | abstract_decl_param_list 1332 ; 1333 1334 id_list_lparen: 1335 T_LPAREN { 1336 block_level++; 1337 begin_declaration_level(PROTO_ARG); 1338 } 1339 ; 1340 1341 array_size: 1342 type_qualifier_list_opt T_SCLASS constant_expr { 1343 /* C11 6.7.6.3p7 */ 1344 if ($2 != STATIC) 1345 yyerror("Bad attribute"); 1346 /* static array size is a C11 extension */ 1347 c11ism(343); 1348 $$ = $3; 1349 } 1350 | constant_expr 1351 ; 1352 1353 identifier_list: /* C99 6.7.5 */ 1354 T_NAME { 1355 $$ = old_style_function_name(getsym($1)); 1356 } 1357 | identifier_list T_COMMA T_NAME { 1358 $$ = lnklst($1, old_style_function_name(getsym($3))); 1359 } 1360 | identifier_list error 1361 ; 1362 1363 /* XXX: C99 requires an additional specifier-qualifier-list. */ 1364 type_name: /* C99 6.7.6 */ 1365 { 1366 begin_declaration_level(ABSTRACT); 1367 } abstract_declaration { 1368 end_declaration_level(); 1369 $$ = $2->s_type; 1370 } 1371 ; 1372 1373 abstract_declaration: /* specific to lint */ 1374 begin_type_qualifier_list end_type { 1375 $$ = declare_1_abstract(abstract_name()); 1376 } 1377 | begin_type_specifier_qualifier_list end_type { 1378 $$ = declare_1_abstract(abstract_name()); 1379 } 1380 | begin_type_qualifier_list end_type abstract_declarator { 1381 $$ = declare_1_abstract($3); 1382 } 1383 | begin_type_specifier_qualifier_list end_type abstract_declarator { 1384 $$ = declare_1_abstract($3); 1385 } 1386 ; 1387 1388 /* K&R 8.7, C90 ???, C99 6.7.6, C11 6.7.7 */ 1389 /* In K&R, abstract-declarator could be empty and was still simpler. */ 1390 abstract_declarator: 1391 pointer { 1392 $$ = add_pointer(abstract_name(), $1); 1393 } 1394 | direct_abstract_declarator 1395 | pointer direct_abstract_declarator { 1396 $$ = add_pointer($2, $1); 1397 } 1398 ; 1399 1400 /* K&R ---, C90 ???, C99 6.7.6, C11 6.7.7 */ 1401 direct_abstract_declarator: 1402 T_LPAREN abstract_declarator T_RPAREN { 1403 $$ = $2; 1404 } 1405 | T_LBRACK T_RBRACK { 1406 $$ = add_array(abstract_name(), false, 0); 1407 } 1408 | T_LBRACK array_size T_RBRACK { 1409 $$ = add_array(abstract_name(), true, 1410 to_int_constant($2, false)); 1411 } 1412 | type_attribute direct_abstract_declarator { 1413 $$ = $2; 1414 } 1415 | direct_abstract_declarator T_LBRACK T_RBRACK { 1416 $$ = add_array($1, false, 0); 1417 } 1418 | direct_abstract_declarator T_LBRACK T_ASTERISK T_RBRACK { /* C99 */ 1419 $$ = add_array($1, false, 0); 1420 } 1421 | direct_abstract_declarator T_LBRACK array_size T_RBRACK { 1422 $$ = add_array($1, true, to_int_constant($3, false)); 1423 } 1424 | abstract_decl_param_list asm_or_symbolrename_opt { 1425 $$ = add_function(symbolrename(abstract_name(), $2), $1); 1426 end_declaration_level(); 1427 block_level--; 1428 } 1429 | direct_abstract_declarator abstract_decl_param_list 1430 asm_or_symbolrename_opt { 1431 $$ = add_function(symbolrename($1, $3), $2); 1432 end_declaration_level(); 1433 block_level--; 1434 } 1435 | direct_abstract_declarator type_attribute_list 1436 ; 1437 1438 abstract_decl_param_list: /* specific to lint */ 1439 abstract_decl_lparen T_RPAREN type_attribute_opt { 1440 $$ = NULL; 1441 } 1442 | abstract_decl_lparen vararg_parameter_type_list T_RPAREN 1443 type_attribute_opt { 1444 dcs->d_proto = true; 1445 $$ = $2; 1446 } 1447 | abstract_decl_lparen error T_RPAREN type_attribute_opt { 1448 $$ = NULL; 1449 } 1450 ; 1451 1452 abstract_decl_lparen: /* specific to lint */ 1453 T_LPAREN { 1454 block_level++; 1455 begin_declaration_level(PROTO_ARG); 1456 } 1457 ; 1458 1459 vararg_parameter_type_list: /* specific to lint */ 1460 parameter_type_list 1461 | parameter_type_list T_COMMA T_ELLIPSIS { 1462 dcs->d_vararg = true; 1463 $$ = $1; 1464 } 1465 | T_ELLIPSIS { 1466 if (sflag) { 1467 /* ANSI C requires formal parameter before '...' */ 1468 error(84); 1469 } else if (!tflag) { 1470 /* ANSI C requires formal parameter before '...' */ 1471 warning(84); 1472 } 1473 dcs->d_vararg = true; 1474 $$ = NULL; 1475 } 1476 ; 1477 1478 /* XXX: C99 6.7.5 defines the same name, but it looks different. */ 1479 parameter_type_list: 1480 parameter_declaration 1481 | parameter_type_list T_COMMA parameter_declaration { 1482 $$ = lnklst($1, $3); 1483 } 1484 ; 1485 1486 /* XXX: C99 6.7.5 defines the same name, but it looks completely different. */ 1487 parameter_declaration: 1488 begin_type_declmods end_type { 1489 /* ^^ There is no check for the missing type-specifier. */ 1490 $$ = declare_argument(abstract_name(), false); 1491 } 1492 | begin_type_declaration_specifiers end_type { 1493 $$ = declare_argument(abstract_name(), false); 1494 } 1495 | begin_type_declmods end_type notype_param_declarator { 1496 /* ^^ There is no check for the missing type-specifier. */ 1497 $$ = declare_argument($3, false); 1498 } 1499 /* 1500 * type_param_declarator is needed because of following conflict: 1501 * "typedef int a; f(int (a));" could be parsed as 1502 * "function with argument a of type int", or 1503 * "function with an abstract argument of type function". 1504 * This grammar realizes the second case. 1505 */ 1506 | begin_type_declaration_specifiers end_type type_param_declarator { 1507 $$ = declare_argument($3, false); 1508 } 1509 | begin_type_declmods end_type abstract_declarator { 1510 /* ^^ There is no check for the missing type-specifier. */ 1511 $$ = declare_argument($3, false); 1512 } 1513 | begin_type_declaration_specifiers end_type abstract_declarator { 1514 $$ = declare_argument($3, false); 1515 } 1516 ; 1517 1518 initializer: /* C99 6.7.8 "Initialization" */ 1519 assignment_expression { 1520 init_expr($1); 1521 } 1522 | init_lbrace init_rbrace { 1523 /* XXX: Empty braces are not covered by C99 6.7.8. */ 1524 } 1525 | init_lbrace initializer_list comma_opt init_rbrace 1526 /* XXX: What is this error handling for? */ 1527 | error 1528 ; 1529 1530 initializer_list: /* C99 6.7.8 "Initialization" */ 1531 initializer_list_item 1532 | initializer_list T_COMMA initializer_list_item 1533 ; 1534 1535 initializer_list_item: /* helper */ 1536 designation initializer 1537 | initializer 1538 ; 1539 1540 designation: /* C99 6.7.8 "Initialization" */ 1541 designator_list T_ASSIGN 1542 | identifier T_COLON { 1543 /* GCC style struct or union member name in initializer */ 1544 gnuism(315); 1545 add_designator_member($1); 1546 } 1547 ; 1548 1549 designator_list: /* C99 6.7.8 "Initialization" */ 1550 designator 1551 | designator_list designator 1552 ; 1553 1554 designator: /* C99 6.7.8 "Initialization" */ 1555 T_LBRACK range T_RBRACK { 1556 add_designator_subscript($2); 1557 if (!Sflag) 1558 /* array initializer with des.s is a C9X feature */ 1559 warning(321); 1560 } 1561 | T_POINT identifier { 1562 if (!Sflag) 1563 /* struct or union member name in initializer is ... */ 1564 warning(313); 1565 add_designator_member($2); 1566 } 1567 ; 1568 1569 range: 1570 constant_expr { 1571 $$.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 $$ = NULL; 1597 } 1598 | T_ASM T_LPAREN T_STRING T_RPAREN gcc_attribute_list_opt { 1599 freeyyv(&$3, T_STRING); 1600 $$ = NULL; 1601 } 1602 | T_SYMBOLRENAME T_LPAREN T_NAME T_RPAREN gcc_attribute_list_opt { 1603 $$ = $3; 1604 } 1605 ; 1606 1607 statement: /* C99 6.8 */ 1608 expression_statement 1609 | non_expr_statement 1610 ; 1611 1612 non_expr_statement: /* helper for C99 6.8 */ 1613 type_attribute T_SEMI 1614 | labeled_statement 1615 | compound_statement 1616 | selection_statement 1617 | iteration_statement 1618 | jump_statement { 1619 seen_fallthrough = false; 1620 } 1621 | asm_statement 1622 ; 1623 1624 labeled_statement: /* C99 6.8.1 */ 1625 label type_attribute_opt statement 1626 ; 1627 1628 label: 1629 T_NAME T_COLON { 1630 symtyp = FLABEL; 1631 named_label(getsym($1)); 1632 } 1633 | T_CASE constant_expr T_COLON { 1634 case_label($2); 1635 seen_fallthrough = true; 1636 } 1637 | T_CASE constant_expr T_ELLIPSIS constant_expr T_COLON { 1638 /* XXX: We don't fill all cases */ 1639 case_label($2); 1640 seen_fallthrough = true; 1641 } 1642 | T_DEFAULT T_COLON { 1643 default_label(); 1644 seen_fallthrough = true; 1645 } 1646 ; 1647 1648 compound_statement: /* C99 6.8.2 */ 1649 compound_statement_lbrace compound_statement_rbrace 1650 | compound_statement_lbrace block_item_list compound_statement_rbrace 1651 ; 1652 1653 compound_statement_lbrace: 1654 T_LBRACE { 1655 block_level++; 1656 mem_block_level++; 1657 begin_declaration_level(AUTO); 1658 } 1659 ; 1660 1661 compound_statement_rbrace: 1662 T_RBRACE { 1663 end_declaration_level(); 1664 freeblk(); 1665 mem_block_level--; 1666 block_level--; 1667 seen_fallthrough = false; 1668 } 1669 ; 1670 1671 block_item_list: /* C99 6.8.2 */ 1672 block_item 1673 | block_item_list block_item { 1674 if (!Sflag && $1 && !$2) 1675 /* declarations after statements is a C99 feature */ 1676 c99ism(327); 1677 $$ = $1 || $2; 1678 } 1679 ; 1680 1681 block_item: /* C99 6.8.2 */ 1682 declaration_or_error { 1683 $$ = false; 1684 restore_warning_flags(); 1685 } 1686 | statement { 1687 $$ = true; 1688 restore_warning_flags(); 1689 } 1690 ; 1691 1692 expression_statement: /* C99 6.8.3 */ 1693 expression T_SEMI { 1694 expr($1, false, false, false, false); 1695 seen_fallthrough = false; 1696 } 1697 | T_SEMI { 1698 seen_fallthrough = false; 1699 } 1700 ; 1701 1702 selection_statement: /* C99 6.8.4 */ 1703 if_without_else %prec T_THEN { 1704 save_warning_flags(); 1705 if2(); 1706 if3(false); 1707 } 1708 | if_without_else T_ELSE { 1709 save_warning_flags(); 1710 if2(); 1711 } statement { 1712 clear_warning_flags(); 1713 if3(true); 1714 } 1715 | if_without_else T_ELSE error { 1716 clear_warning_flags(); 1717 if3(false); 1718 } 1719 | switch_expr statement { 1720 clear_warning_flags(); 1721 switch2(); 1722 } 1723 | switch_expr error { 1724 clear_warning_flags(); 1725 switch2(); 1726 } 1727 ; 1728 1729 if_without_else: /* see C99 6.8.4 */ 1730 if_expr statement 1731 | if_expr error 1732 ; 1733 1734 if_expr: /* see C99 6.8.4 */ 1735 T_IF T_LPAREN expression T_RPAREN { 1736 if1($3); 1737 clear_warning_flags(); 1738 } 1739 ; 1740 1741 switch_expr: /* see C99 6.8.4 */ 1742 T_SWITCH T_LPAREN expression T_RPAREN { 1743 switch1($3); 1744 clear_warning_flags(); 1745 } 1746 ; 1747 1748 iteration_statement: /* C99 6.8.5 */ 1749 while_expr statement { 1750 clear_warning_flags(); 1751 while2(); 1752 } 1753 | while_expr error { 1754 clear_warning_flags(); 1755 while2(); 1756 } 1757 | do_statement do_while_expr { 1758 do2($2); 1759 seen_fallthrough = false; 1760 } 1761 | do error { 1762 clear_warning_flags(); 1763 do2(NULL); 1764 } 1765 | for_exprs statement { 1766 clear_warning_flags(); 1767 for2(); 1768 end_declaration_level(); 1769 block_level--; 1770 } 1771 | for_exprs error { 1772 clear_warning_flags(); 1773 for2(); 1774 end_declaration_level(); 1775 block_level--; 1776 } 1777 ; 1778 1779 while_expr: /* see C99 6.8.5 */ 1780 T_WHILE T_LPAREN expression T_RPAREN { 1781 while1($3); 1782 clear_warning_flags(); 1783 } 1784 ; 1785 1786 do_statement: /* see C99 6.8.5 */ 1787 do statement { 1788 clear_warning_flags(); 1789 } 1790 ; 1791 1792 do: /* see C99 6.8.5 */ 1793 T_DO { 1794 do1(); 1795 } 1796 ; 1797 1798 do_while_expr: /* see C99 6.8.5 */ 1799 T_WHILE T_LPAREN expression T_RPAREN T_SEMI { 1800 $$ = $3; 1801 } 1802 ; 1803 1804 for_start: /* see C99 6.8.5 */ 1805 T_FOR T_LPAREN { 1806 begin_declaration_level(AUTO); 1807 block_level++; 1808 } 1809 ; 1810 1811 for_exprs: /* see C99 6.8.5 */ 1812 for_start 1813 begin_type_declaration_specifiers end_type 1814 notype_init_declarators T_SEMI 1815 expression_opt T_SEMI expression_opt T_RPAREN { 1816 /* variable declaration in for loop */ 1817 c99ism(325); 1818 for1(NULL, $6, $8); 1819 clear_warning_flags(); 1820 } 1821 | for_start 1822 expression_opt T_SEMI 1823 expression_opt T_SEMI 1824 expression_opt T_RPAREN { 1825 for1($2, $4, $6); 1826 clear_warning_flags(); 1827 } 1828 ; 1829 1830 jump_statement: /* C99 6.8.6 */ 1831 goto identifier T_SEMI { 1832 do_goto(getsym($2)); 1833 } 1834 | goto error T_SEMI { 1835 symtyp = FVFT; 1836 } 1837 | T_CONTINUE T_SEMI { 1838 do_continue(); 1839 } 1840 | T_BREAK T_SEMI { 1841 do_break(); 1842 } 1843 | T_RETURN T_SEMI { 1844 do_return(NULL); 1845 } 1846 | T_RETURN expression T_SEMI { 1847 do_return($2); 1848 } 1849 ; 1850 1851 goto: /* see C99 6.8.6 */ 1852 T_GOTO { 1853 symtyp = FLABEL; 1854 } 1855 ; 1856 1857 asm_statement: /* GCC extension */ 1858 T_ASM T_LPAREN read_until_rparen T_SEMI { 1859 setasm(); 1860 } 1861 | T_ASM T_QUAL T_LPAREN read_until_rparen T_SEMI { 1862 setasm(); 1863 } 1864 | T_ASM error 1865 ; 1866 1867 read_until_rparen: /* helper for 'asm_statement' */ 1868 /* empty */ { 1869 read_until_rparen(); 1870 } 1871 ; 1872 1873 translation_unit: /* C99 6.9 */ 1874 external_declaration 1875 | translation_unit external_declaration 1876 ; 1877 1878 external_declaration: /* C99 6.9 */ 1879 function_definition { 1880 global_clean_up_decl(false); 1881 clear_warning_flags(); 1882 } 1883 | top_level_declaration { 1884 global_clean_up_decl(false); 1885 clear_warning_flags(); 1886 } 1887 | asm_statement /* GCC extension */ 1888 | T_SEMI { /* GCC extension */ 1889 if (sflag) { 1890 /* empty declaration */ 1891 error(0); 1892 } else if (!tflag) { 1893 /* empty declaration */ 1894 warning(0); 1895 } 1896 } 1897 ; 1898 1899 /* 1900 * On the top level, lint allows several forms of declarations that it doesn't 1901 * allow in functions. For example, a single ';' is an empty declaration and 1902 * is supported by some compilers, but in a function it would be an empty 1903 * statement, not a declaration. This makes a difference in C90 mode, where 1904 * a statement must not be followed by a declaration. 1905 * 1906 * See 'declaration' for all other declarations. 1907 */ 1908 top_level_declaration: /* C99 6.9 calls this 'declaration' */ 1909 begin_type end_type notype_init_declarators T_SEMI { 1910 if (sflag) { 1911 /* old style declaration; add 'int' */ 1912 error(1); 1913 } else if (!tflag) { 1914 /* old style declaration; add 'int' */ 1915 warning(1); 1916 } 1917 } 1918 | declaration 1919 | error T_SEMI { 1920 global_clean_up(); 1921 } 1922 | error T_RBRACE { 1923 global_clean_up(); 1924 } 1925 ; 1926 1927 function_definition: /* C99 6.9.1 */ 1928 func_declarator { 1929 if ($1->s_type->t_tspec != FUNC) { 1930 /* syntax error '%s' */ 1931 error(249, yytext); 1932 YYERROR; 1933 } 1934 if ($1->s_type->t_typedef) { 1935 /* ()-less function definition */ 1936 error(64); 1937 YYERROR; 1938 } 1939 funcdef($1); 1940 block_level++; 1941 begin_declaration_level(ARG); 1942 if (lwarn == LWARN_NONE) 1943 $1->s_used = true; 1944 } arg_declaration_list_opt { 1945 end_declaration_level(); 1946 block_level--; 1947 check_func_lint_directives(); 1948 check_func_old_style_arguments(); 1949 begin_control_statement(CS_FUNCTION_BODY); 1950 } compound_statement { 1951 funcend(); 1952 end_control_statement(CS_FUNCTION_BODY); 1953 } 1954 ; 1955 1956 func_declarator: 1957 begin_type end_type notype_declarator { 1958 /* ^^ There is no check for the missing type-specifier. */ 1959 $$ = $3; 1960 } 1961 | begin_type_declmods end_type notype_declarator { 1962 /* ^^ There is no check for the missing type-specifier. */ 1963 $$ = $3; 1964 } 1965 | begin_type_declaration_specifiers end_type type_declarator { 1966 $$ = $3; 1967 } 1968 ; 1969 1970 arg_declaration_list_opt: /* C99 6.9.1p13 example 1 */ 1971 /* empty */ 1972 | arg_declaration_list 1973 ; 1974 1975 arg_declaration_list: /* C99 6.9.1p13 example 1 */ 1976 arg_declaration 1977 | arg_declaration_list arg_declaration 1978 /* XXX or better "arg_declaration error" ? */ 1979 | error 1980 ; 1981 1982 /* 1983 * "arg_declaration" is separated from "declaration" because it 1984 * needs other error handling. 1985 */ 1986 arg_declaration: 1987 begin_type_declmods end_type T_SEMI { 1988 /* empty declaration */ 1989 warning(2); 1990 } 1991 | begin_type_declmods end_type notype_init_declarators T_SEMI 1992 | begin_type_declaration_specifiers end_type T_SEMI { 1993 if (!dcs->d_nonempty_decl) { 1994 /* empty declaration */ 1995 warning(2); 1996 } else { 1997 /* '%s' declared in argument declaration list */ 1998 warning(3, type_name(dcs->d_type)); 1999 } 2000 } 2001 | begin_type_declaration_specifiers end_type 2002 type_init_declarators T_SEMI { 2003 if (dcs->d_nonempty_decl) { 2004 /* '%s' declared in argument declaration list */ 2005 warning(3, type_name(dcs->d_type)); 2006 } 2007 } 2008 | begin_type_declmods error 2009 | begin_type_declaration_specifiers error 2010 ; 2011 2012 gcc_attribute_list_opt: 2013 /* empty */ 2014 | gcc_attribute_list 2015 ; 2016 2017 gcc_attribute_list: 2018 gcc_attribute 2019 | gcc_attribute_list gcc_attribute 2020 ; 2021 2022 gcc_attribute: 2023 T_ATTRIBUTE T_LPAREN T_LPAREN { 2024 attron = true; 2025 } gcc_attribute_spec_list { 2026 attron = false; 2027 } T_RPAREN T_RPAREN 2028 ; 2029 2030 gcc_attribute_spec_list: 2031 gcc_attribute_spec 2032 | gcc_attribute_spec_list T_COMMA gcc_attribute_spec 2033 ; 2034 2035 gcc_attribute_spec: 2036 /* empty */ 2037 | T_AT_ALWAYS_INLINE 2038 | T_AT_ALIAS T_LPAREN string T_RPAREN 2039 | T_AT_ALIGNED T_LPAREN constant_expr T_RPAREN 2040 | T_AT_ALIGNED 2041 | T_AT_ALLOC_SIZE T_LPAREN constant_expr T_COMMA constant_expr T_RPAREN 2042 | T_AT_ALLOC_SIZE T_LPAREN constant_expr T_RPAREN 2043 | T_AT_BOUNDED T_LPAREN gcc_attribute_bounded 2044 T_COMMA constant_expr T_COMMA constant_expr T_RPAREN 2045 | T_AT_COLD 2046 | T_AT_COMMON 2047 | T_AT_CONSTRUCTOR T_LPAREN constant_expr T_RPAREN 2048 | T_AT_CONSTRUCTOR 2049 | T_AT_DEPRECATED T_LPAREN string T_RPAREN 2050 | T_AT_DEPRECATED 2051 | T_AT_DESTRUCTOR T_LPAREN constant_expr T_RPAREN 2052 | T_AT_DESTRUCTOR 2053 | T_AT_FALLTHROUGH { 2054 fallthru(1); 2055 } 2056 | T_AT_FORMAT T_LPAREN gcc_attribute_format T_COMMA 2057 constant_expr T_COMMA constant_expr T_RPAREN 2058 | T_AT_FORMAT_ARG T_LPAREN constant_expr T_RPAREN 2059 | T_AT_GNU_INLINE 2060 | T_AT_HOT 2061 | T_AT_MALLOC 2062 | T_AT_MAY_ALIAS 2063 | T_AT_MODE T_LPAREN T_NAME T_RPAREN 2064 | T_AT_NOINLINE 2065 | T_AT_NONNULL T_LPAREN constant_expr_list_opt T_RPAREN 2066 | T_AT_NONNULL 2067 | T_AT_NONSTRING 2068 | T_AT_NORETURN 2069 | T_AT_NOTHROW 2070 | T_AT_NO_INSTRUMENT_FUNCTION 2071 | T_AT_OPTIMIZE T_LPAREN string T_RPAREN 2072 | T_AT_PACKED { 2073 addpacked(); 2074 } 2075 | T_AT_PCS T_LPAREN string T_RPAREN 2076 | T_AT_PURE 2077 | T_AT_RETURNS_TWICE 2078 | T_AT_SECTION T_LPAREN string T_RPAREN 2079 | T_AT_SENTINEL T_LPAREN constant_expr T_RPAREN 2080 | T_AT_SENTINEL 2081 | T_AT_TLS_MODEL T_LPAREN string T_RPAREN 2082 | T_AT_TUNION 2083 | T_AT_UNUSED { 2084 add_attr_used(); 2085 } 2086 | T_AT_USED { 2087 add_attr_used(); 2088 } 2089 | T_AT_VISIBILITY T_LPAREN constant_expr T_RPAREN 2090 | T_AT_WARN_UNUSED_RESULT 2091 | T_AT_WEAK 2092 | T_QUAL { 2093 if ($1 != CONST) 2094 yyerror("Bad attribute"); 2095 } 2096 ; 2097 2098 gcc_attribute_bounded: 2099 T_AT_MINBYTES 2100 | T_AT_STRING 2101 | T_AT_BUFFER 2102 ; 2103 2104 gcc_attribute_format: 2105 T_AT_FORMAT_GNU_PRINTF 2106 | T_AT_FORMAT_PRINTF 2107 | T_AT_FORMAT_SCANF 2108 | T_AT_FORMAT_STRFMON 2109 | T_AT_FORMAT_STRFTIME 2110 | T_AT_FORMAT_SYSLOG 2111 ; 2112 2113 %% 2114 2115 /* ARGSUSED */ 2116 int 2117 yyerror(const char *msg) 2118 { 2119 /* syntax error '%s' */ 2120 error(249, yytext); 2121 if (++sytxerr >= 5) 2122 norecover(); 2123 return 0; 2124 } 2125 2126 static void 2127 cgram_declare(sym_t *decl, bool initflg, sbuf_t *renaming) 2128 { 2129 declare(decl, initflg, renaming); 2130 if (renaming != NULL) 2131 freeyyv(&renaming, T_NAME); 2132 } 2133 2134 /* 2135 * Discard all input tokens up to and including the next 2136 * unmatched right paren 2137 */ 2138 static void 2139 read_until_rparen(void) 2140 { 2141 int level; 2142 2143 if (yychar < 0) 2144 yychar = yylex(); 2145 freeyyv(&yylval, yychar); 2146 2147 level = 1; 2148 while (yychar != T_RPAREN || --level > 0) { 2149 if (yychar == T_LPAREN) { 2150 level++; 2151 } else if (yychar <= 0) { 2152 break; 2153 } 2154 freeyyv(&yylval, yychar = yylex()); 2155 } 2156 2157 yyclearin; 2158 } 2159 2160 static sym_t * 2161 symbolrename(sym_t *s, sbuf_t *sb) 2162 { 2163 if (sb != NULL) 2164 s->s_rename = sb->sb_name; 2165 return s; 2166 } 2167
Indexes created Fri Oct 03 02:09:57 GMT 2025