cgram.y revision 1.343
1 %{ 2 /* $NetBSD: cgram.y,v 1.343 2021/07/25 19:05:27 rillig Exp $ */ 3 4 /* 5 * Copyright (c) 1996 Christopher G. Demetriou. All Rights Reserved. 6 * Copyright (c) 1994, 1995 Jochen Pohl 7 * All Rights Reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. All advertising materials mentioning features or use of this software 18 * must display the following acknowledgement: 19 * This product includes software developed by Jochen Pohl for 20 * The NetBSD Project. 21 * 4. The name of the author may not be used to endorse or promote products 22 * derived from this software without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 25 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 26 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 27 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 28 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 29 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 30 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 31 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 32 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 33 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 34 */ 35 36 #include <sys/cdefs.h> 37 #if defined(__RCSID) && !defined(lint) 38 __RCSID("$NetBSD: cgram.y,v 1.343 2021/07/25 19:05:27 rillig Exp $"); 39 #endif 40 41 #include <limits.h> 42 #include <stdlib.h> 43 #include <string.h> 44 45 #include "lint1.h" 46 47 extern char *yytext; 48 49 /* 50 * Contains the level of current declaration, used for symbol table entries. 51 * 0 is the top-level, > 0 is inside a function body. 52 */ 53 int block_level; 54 55 /* 56 * level for memory allocation. Normally the same as block_level. 57 * An exception is the declaration of arguments in prototypes. Memory 58 * for these can't be freed after the declaration, but symbols must 59 * be removed from the symbol table after the declaration. 60 */ 61 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 159 128 129 %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_typespec { 782 add_type($1); 783 } 784 /* TODO: shift/reduce conflict for type_attribute */ 785 | type_attribute begin_type_specifier_qualifier_list 786 | begin_type_qualifier_list type_specifier { 787 add_type($2); 788 } 789 | begin_type_specifier_qualifier_list T_QUAL { 790 add_qualifier($2); 791 } 792 | begin_type_specifier_qualifier_list notype_type_specifier { 793 add_type($2); 794 } 795 | begin_type_specifier_qualifier_list type_attribute 796 ; 797 798 begin_type_typespec: 799 begin_type notype_type_specifier { 800 $$ = $2; 801 } 802 | T_TYPENAME begin_type { 803 $$ = getsym($1)->s_type; 804 } 805 ; 806 807 begin_type_qualifier_list: 808 begin_type T_QUAL { 809 add_qualifier($2); 810 } 811 | begin_type_qualifier_list T_QUAL { 812 add_qualifier($2); 813 } 814 ; 815 816 declmod: 817 T_QUAL { 818 add_qualifier($1); 819 } 820 | T_SCLASS { 821 add_storage_class($1); 822 } 823 | type_attribute_list 824 ; 825 826 type_attribute_list: 827 type_attribute 828 | type_attribute_list type_attribute 829 ; 830 831 type_attribute_opt: 832 /* empty */ 833 | type_attribute 834 ; 835 836 type_attribute: /* See C11 6.7 declaration-specifiers */ 837 gcc_attribute 838 /* TODO: c11ism */ 839 | T_ALIGNAS T_LPAREN align_as T_RPAREN 840 | T_PACKED { 841 addpacked(); 842 } 843 | T_NORETURN 844 ; 845 846 align_as: /* See alignment-specifier in C11 6.7.5 */ 847 type_specifier 848 | constant_expr 849 ; 850 851 begin_type: 852 /* empty */ { 853 begin_type(); 854 } 855 ; 856 857 end_type: 858 /* empty */ { 859 end_type(); 860 } 861 ; 862 863 type_specifier: /* C99 6.7.2 */ 864 notype_type_specifier 865 | T_TYPENAME { 866 $$ = getsym($1)->s_type; 867 } 868 ; 869 870 notype_type_specifier: /* see C99 6.7.2 */ 871 T_TYPE { 872 $$ = gettyp($1); 873 } 874 | T_TYPEOF T_LPAREN expression T_RPAREN { /* GCC extension */ 875 $$ = $3->tn_type; 876 } 877 | struct_or_union_specifier { 878 end_declaration_level(); 879 $$ = $1; 880 } 881 | enum_specifier { 882 end_declaration_level(); 883 $$ = $1; 884 } 885 ; 886 887 struct_or_union_specifier: /* C99 6.7.2.1 */ 888 struct_or_union identifier_sym { 889 /* 890 * STDC requires that "struct a;" always introduces 891 * a new tag if "a" is not declared at current level 892 * 893 * yychar is valid because otherwise the parser would not 894 * have been able to decide if it must shift or reduce 895 */ 896 $$ = mktag($2, $1, false, yychar == T_SEMI); 897 } 898 | struct_or_union identifier_sym { 899 dcs->d_tagtyp = mktag($2, $1, true, false); 900 } braced_struct_declaration_list { 901 $$ = complete_tag_struct_or_union(dcs->d_tagtyp, $4); 902 } 903 | struct_or_union { 904 dcs->d_tagtyp = mktag(NULL, $1, true, false); 905 } braced_struct_declaration_list { 906 $$ = complete_tag_struct_or_union(dcs->d_tagtyp, $3); 907 } 908 | struct_or_union error { 909 symtyp = FVFT; 910 $$ = gettyp(INT); 911 } 912 ; 913 914 struct_or_union: /* C99 6.7.2.1 */ 915 T_STRUCT_OR_UNION { 916 symtyp = FTAG; 917 begin_declaration_level($1 == STRUCT ? MOS : MOU); 918 dcs->d_offset = 0; 919 dcs->d_sou_align_in_bits = CHAR_SIZE; 920 $$ = $1; 921 } 922 | struct_or_union type_attribute 923 ; 924 925 braced_struct_declaration_list: /* see C99 6.7.2.1 */ 926 struct_declaration_lbrace struct_declaration_list_with_rbrace { 927 $$ = $2; 928 } 929 ; 930 931 struct_declaration_lbrace: /* see C99 6.7.2.1 */ 932 T_LBRACE { 933 symtyp = FVFT; 934 } 935 ; 936 937 struct_declaration_list_with_rbrace: /* see C99 6.7.2.1 */ 938 struct_declaration_list T_RBRACE 939 | T_RBRACE { 940 /* XXX: This is not allowed by any C standard. */ 941 $$ = NULL; 942 } 943 ; 944 945 struct_declaration_list: /* C99 6.7.2.1 */ 946 struct_declaration 947 | struct_declaration_list struct_declaration { 948 $$ = lnklst($1, $2); 949 } 950 ; 951 952 struct_declaration: /* C99 6.7.2.1 */ 953 begin_type_qualifier_list end_type { 954 /* ^^ There is no check for the missing type-specifier. */ 955 /* too late, i know, but getsym() compensates it */ 956 symtyp = FMEMBER; 957 } notype_struct_declarators type_attribute_opt T_SEMI { 958 symtyp = FVFT; 959 $$ = $4; 960 } 961 | begin_type_specifier_qualifier_list end_type { 962 symtyp = FMEMBER; 963 } type_struct_declarators type_attribute_opt T_SEMI { 964 symtyp = FVFT; 965 $$ = $4; 966 } 967 | begin_type_qualifier_list end_type type_attribute_opt T_SEMI { 968 /* syntax error '%s' */ 969 error(249, "member without type"); 970 $$ = NULL; 971 } 972 | begin_type_specifier_qualifier_list end_type type_attribute_opt 973 T_SEMI { 974 symtyp = FVFT; 975 if (!Sflag) 976 /* anonymous struct/union members is a C9X feature */ 977 warning(49); 978 if (is_struct_or_union(dcs->d_type->t_tspec)) { 979 $$ = dcs->d_type->t_str->sou_first_member; 980 /* add all the members of the anonymous struct/union */ 981 anonymize($$); 982 } else { 983 /* syntax error '%s' */ 984 error(249, "unnamed member"); 985 $$ = NULL; 986 } 987 } 988 | error T_SEMI { 989 symtyp = FVFT; 990 $$ = NULL; 991 } 992 ; 993 994 notype_struct_declarators: 995 notype_struct_declarator { 996 $$ = declarator_1_struct_union($1); 997 } 998 | notype_struct_declarators { 999 symtyp = FMEMBER; 1000 } T_COMMA type_struct_declarator { 1001 $$ = lnklst($1, declarator_1_struct_union($4)); 1002 } 1003 ; 1004 1005 type_struct_declarators: 1006 type_struct_declarator { 1007 $$ = declarator_1_struct_union($1); 1008 } 1009 | type_struct_declarators { 1010 symtyp = FMEMBER; 1011 } T_COMMA type_struct_declarator { 1012 $$ = lnklst($1, declarator_1_struct_union($4)); 1013 } 1014 ; 1015 1016 notype_struct_declarator: 1017 notype_declarator 1018 | notype_declarator T_COLON constant_expr { /* C99 6.7.2.1 */ 1019 $$ = bitfield($1, to_int_constant($3, true)); 1020 } 1021 | { 1022 symtyp = FVFT; 1023 } T_COLON constant_expr { /* C99 6.7.2.1 */ 1024 $$ = bitfield(NULL, to_int_constant($3, true)); 1025 } 1026 ; 1027 1028 type_struct_declarator: 1029 type_declarator 1030 | type_declarator T_COLON constant_expr { 1031 $$ = bitfield($1, to_int_constant($3, true)); 1032 } 1033 | { 1034 symtyp = FVFT; 1035 } T_COLON constant_expr { 1036 $$ = bitfield(NULL, to_int_constant($3, true)); 1037 } 1038 ; 1039 1040 enum_specifier: /* C99 6.7.2.2 */ 1041 enum gcc_attribute_list_opt identifier_sym { 1042 $$ = mktag($3, ENUM, false, false); 1043 } 1044 | enum gcc_attribute_list_opt identifier_sym { 1045 dcs->d_tagtyp = mktag($3, ENUM, true, false); 1046 } enum_declaration /*gcc_attribute_list_opt*/ { 1047 $$ = complete_tag_enum(dcs->d_tagtyp, $5); 1048 } 1049 | enum gcc_attribute_list_opt { 1050 dcs->d_tagtyp = mktag(NULL, ENUM, true, false); 1051 } enum_declaration /*gcc_attribute_list_opt*/ { 1052 $$ = complete_tag_enum(dcs->d_tagtyp, $4); 1053 } 1054 | enum error { 1055 symtyp = FVFT; 1056 $$ = gettyp(INT); 1057 } 1058 ; 1059 1060 enum: /* helper for C99 6.7.2.2 */ 1061 T_ENUM { 1062 symtyp = FTAG; 1063 begin_declaration_level(CTCONST); 1064 } 1065 ; 1066 1067 enum_declaration: /* helper for C99 6.7.2.2 */ 1068 enum_decl_lbrace enums_with_opt_comma T_RBRACE { 1069 $$ = $2; 1070 } 1071 ; 1072 1073 enum_decl_lbrace: /* helper for C99 6.7.2.2 */ 1074 T_LBRACE { 1075 symtyp = FVFT; 1076 enumval = 0; 1077 } 1078 ; 1079 1080 enums_with_opt_comma: /* helper for C99 6.7.2.2 */ 1081 enumerator_list 1082 | enumerator_list T_COMMA { 1083 if (sflag) { 1084 /* trailing ',' prohibited in enum declaration */ 1085 error(54); 1086 } else { 1087 /* trailing ',' prohibited in enum declaration */ 1088 c99ism(54); 1089 } 1090 $$ = $1; 1091 } 1092 ; 1093 1094 enumerator_list: /* C99 6.7.2.2 */ 1095 enumerator 1096 | enumerator_list T_COMMA enumerator { 1097 $$ = lnklst($1, $3); 1098 } 1099 | error { 1100 $$ = NULL; 1101 } 1102 ; 1103 1104 enumerator: /* C99 6.7.2.2 */ 1105 identifier_sym gcc_attribute_list_opt { 1106 $$ = enumeration_constant($1, enumval, true); 1107 } 1108 | identifier_sym gcc_attribute_list_opt T_ASSIGN constant_expr { 1109 $$ = enumeration_constant($1, to_int_constant($4, true), 1110 false); 1111 } 1112 ; 1113 1114 type_qualifier: /* C99 6.7.3 */ 1115 T_QUAL { 1116 $$ = xcalloc(1, sizeof(*$$)); 1117 if ($1 == CONST) 1118 $$->p_const = true; 1119 if ($1 == VOLATILE) 1120 $$->p_volatile = true; 1121 } 1122 ; 1123 1124 pointer: /* C99 6.7.5 */ 1125 asterisk type_qualifier_list_opt { 1126 $$ = merge_qualified_pointer($1, $2); 1127 } 1128 | asterisk type_qualifier_list_opt pointer { 1129 $$ = merge_qualified_pointer($1, $2); 1130 $$ = merge_qualified_pointer($$, $3); 1131 } 1132 ; 1133 1134 asterisk: /* helper for 'pointer' */ 1135 T_ASTERISK { 1136 $$ = xcalloc(1, sizeof(*$$)); 1137 $$->p_pointer = true; 1138 } 1139 ; 1140 1141 type_qualifier_list_opt: /* see C99 6.7.5 */ 1142 /* empty */ { 1143 $$ = NULL; 1144 } 1145 | type_qualifier_list 1146 ; 1147 1148 type_qualifier_list: /* C99 6.7.5 */ 1149 type_qualifier 1150 | type_qualifier_list type_qualifier { 1151 $$ = merge_qualified_pointer($1, $2); 1152 } 1153 ; 1154 1155 /* 1156 * For an explanation of 'notype' in the following rules, see the Bison 1157 * manual, section 7.1 "Semantic Info in Token Kinds". 1158 */ 1159 1160 notype_init_declarators: 1161 notype_init_declarator 1162 | notype_init_declarators T_COMMA type_init_declarator 1163 ; 1164 1165 type_init_declarators: 1166 type_init_declarator 1167 | type_init_declarators T_COMMA type_init_declarator 1168 ; 1169 1170 notype_init_declarator: 1171 notype_declarator asm_or_symbolrename_opt { 1172 cgram_declare($1, false, $2); 1173 check_size($1); 1174 } 1175 | notype_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 type_init_declarator: 1185 type_declarator asm_or_symbolrename_opt { 1186 cgram_declare($1, false, $2); 1187 check_size($1); 1188 } 1189 | type_declarator asm_or_symbolrename_opt { 1190 begin_initialization($1); 1191 cgram_declare($1, true, $2); 1192 } T_ASSIGN initializer { 1193 check_size($1); 1194 end_initialization(); 1195 } 1196 ; 1197 1198 notype_declarator: 1199 notype_direct_declarator 1200 | pointer notype_direct_declarator { 1201 $$ = add_pointer($2, $1); 1202 } 1203 ; 1204 1205 type_declarator: 1206 type_direct_declarator 1207 | pointer type_direct_declarator { 1208 $$ = add_pointer($2, $1); 1209 } 1210 ; 1211 1212 notype_direct_declarator: 1213 T_NAME { 1214 $$ = declarator_name(getsym($1)); 1215 } 1216 | T_LPAREN type_declarator T_RPAREN { 1217 $$ = $2; 1218 } 1219 | type_attribute notype_direct_declarator { 1220 $$ = $2; 1221 } 1222 | notype_direct_declarator T_LBRACK T_RBRACK { 1223 $$ = add_array($1, false, 0); 1224 } 1225 | notype_direct_declarator T_LBRACK array_size T_RBRACK { 1226 $$ = add_array($1, true, to_int_constant($3, false)); 1227 } 1228 | notype_direct_declarator param_list asm_or_symbolrename_opt { 1229 $$ = add_function(symbolrename($1, $3), $2); 1230 end_declaration_level(); 1231 block_level--; 1232 } 1233 | notype_direct_declarator type_attribute 1234 ; 1235 1236 type_direct_declarator: 1237 identifier { 1238 $$ = declarator_name(getsym($1)); 1239 } 1240 | T_LPAREN type_declarator T_RPAREN { 1241 $$ = $2; 1242 } 1243 | type_attribute type_direct_declarator { 1244 $$ = $2; 1245 } 1246 | type_direct_declarator T_LBRACK T_RBRACK { 1247 $$ = add_array($1, false, 0); 1248 } 1249 | type_direct_declarator T_LBRACK array_size T_RBRACK { 1250 $$ = add_array($1, true, to_int_constant($3, false)); 1251 } 1252 | type_direct_declarator param_list asm_or_symbolrename_opt { 1253 $$ = add_function(symbolrename($1, $3), $2); 1254 end_declaration_level(); 1255 block_level--; 1256 } 1257 | type_direct_declarator type_attribute 1258 ; 1259 1260 /* 1261 * The two distinct rules type_param_declarator and notype_param_declarator 1262 * avoid a conflict in argument lists. A typename enclosed in parentheses is 1263 * always treated as a typename, not an argument name. For example, after 1264 * "typedef double a;", the declaration "f(int (a));" is interpreted as 1265 * "f(int (double));", not "f(int a);". 1266 */ 1267 type_param_declarator: 1268 direct_param_declarator 1269 | pointer direct_param_declarator { 1270 $$ = add_pointer($2, $1); 1271 } 1272 ; 1273 1274 notype_param_declarator: 1275 direct_notype_param_declarator 1276 | pointer direct_notype_param_declarator { 1277 $$ = add_pointer($2, $1); 1278 } 1279 ; 1280 1281 direct_param_declarator: 1282 identifier type_attribute_list { 1283 $$ = declarator_name(getsym($1)); 1284 } 1285 | identifier { 1286 $$ = declarator_name(getsym($1)); 1287 } 1288 | T_LPAREN notype_param_declarator T_RPAREN { 1289 $$ = $2; 1290 } 1291 | direct_param_declarator T_LBRACK T_RBRACK { 1292 $$ = add_array($1, false, 0); 1293 } 1294 | direct_param_declarator T_LBRACK array_size T_RBRACK { 1295 $$ = add_array($1, true, to_int_constant($3, false)); 1296 } 1297 | direct_param_declarator param_list asm_or_symbolrename_opt { 1298 $$ = add_function(symbolrename($1, $3), $2); 1299 end_declaration_level(); 1300 block_level--; 1301 } 1302 ; 1303 1304 direct_notype_param_declarator: 1305 identifier { 1306 $$ = declarator_name(getsym($1)); 1307 } 1308 | T_LPAREN notype_param_declarator T_RPAREN { 1309 $$ = $2; 1310 } 1311 | direct_notype_param_declarator T_LBRACK T_RBRACK { 1312 $$ = add_array($1, false, 0); 1313 } 1314 | direct_notype_param_declarator T_LBRACK array_size T_RBRACK { 1315 $$ = add_array($1, true, to_int_constant($3, false)); 1316 } 1317 | direct_notype_param_declarator param_list asm_or_symbolrename_opt { 1318 $$ = add_function(symbolrename($1, $3), $2); 1319 end_declaration_level(); 1320 block_level--; 1321 } 1322 ; 1323 1324 param_list: 1325 id_list_lparen identifier_list T_RPAREN { 1326 $$ = $2; 1327 } 1328 | abstract_decl_param_list 1329 ; 1330 1331 id_list_lparen: 1332 T_LPAREN { 1333 block_level++; 1334 begin_declaration_level(PROTO_ARG); 1335 } 1336 ; 1337 1338 array_size: 1339 type_qualifier_list_opt T_SCLASS constant_expr { 1340 /* C11 6.7.6.3p7 */ 1341 if ($2 != STATIC) 1342 yyerror("Bad attribute"); 1343 /* static array size is a C11 extension */ 1344 c11ism(343); 1345 $$ = $3; 1346 } 1347 | constant_expr 1348 ; 1349 1350 identifier_list: /* C99 6.7.5 */ 1351 T_NAME { 1352 $$ = old_style_function_name(getsym($1)); 1353 } 1354 | identifier_list T_COMMA T_NAME { 1355 $$ = lnklst($1, old_style_function_name(getsym($3))); 1356 } 1357 | identifier_list error 1358 ; 1359 1360 /* XXX: C99 requires an additional specifier-qualifier-list. */ 1361 type_name: /* C99 6.7.6 */ 1362 { 1363 begin_declaration_level(ABSTRACT); 1364 } abstract_declaration { 1365 end_declaration_level(); 1366 $$ = $2->s_type; 1367 } 1368 ; 1369 1370 abstract_declaration: /* specific to lint */ 1371 begin_type_qualifier_list end_type { 1372 $$ = declare_1_abstract(abstract_name()); 1373 } 1374 | begin_type_specifier_qualifier_list end_type { 1375 $$ = declare_1_abstract(abstract_name()); 1376 } 1377 | begin_type_qualifier_list end_type abstract_declarator { 1378 $$ = declare_1_abstract($3); 1379 } 1380 | begin_type_specifier_qualifier_list end_type abstract_declarator { 1381 $$ = declare_1_abstract($3); 1382 } 1383 ; 1384 1385 /* K&R 8.7, C90 ???, C99 6.7.6, C11 6.7.7 */ 1386 /* In K&R, abstract-declarator could be empty and was still simpler. */ 1387 abstract_declarator: 1388 pointer { 1389 $$ = add_pointer(abstract_name(), $1); 1390 } 1391 | direct_abstract_declarator 1392 | pointer direct_abstract_declarator { 1393 $$ = add_pointer($2, $1); 1394 } 1395 ; 1396 1397 /* K&R ---, C90 ???, C99 6.7.6, C11 6.7.7 */ 1398 direct_abstract_declarator: 1399 T_LPAREN abstract_declarator T_RPAREN { 1400 $$ = $2; 1401 } 1402 | T_LBRACK T_RBRACK { 1403 $$ = add_array(abstract_name(), false, 0); 1404 } 1405 | T_LBRACK array_size T_RBRACK { 1406 $$ = add_array(abstract_name(), true, 1407 to_int_constant($2, false)); 1408 } 1409 | type_attribute direct_abstract_declarator { 1410 $$ = $2; 1411 } 1412 | direct_abstract_declarator T_LBRACK T_RBRACK { 1413 $$ = add_array($1, false, 0); 1414 } 1415 | direct_abstract_declarator T_LBRACK T_ASTERISK T_RBRACK { /* C99 */ 1416 $$ = add_array($1, false, 0); 1417 } 1418 | direct_abstract_declarator T_LBRACK array_size T_RBRACK { 1419 $$ = add_array($1, true, to_int_constant($3, false)); 1420 } 1421 | abstract_decl_param_list asm_or_symbolrename_opt { 1422 $$ = add_function(symbolrename(abstract_name(), $2), $1); 1423 end_declaration_level(); 1424 block_level--; 1425 } 1426 | direct_abstract_declarator abstract_decl_param_list 1427 asm_or_symbolrename_opt { 1428 $$ = add_function(symbolrename($1, $3), $2); 1429 end_declaration_level(); 1430 block_level--; 1431 } 1432 | direct_abstract_declarator type_attribute_list 1433 ; 1434 1435 abstract_decl_param_list: /* specific to lint */ 1436 abstract_decl_lparen T_RPAREN type_attribute_opt { 1437 $$ = NULL; 1438 } 1439 | abstract_decl_lparen vararg_parameter_type_list T_RPAREN 1440 type_attribute_opt { 1441 dcs->d_proto = true; 1442 $$ = $2; 1443 } 1444 | abstract_decl_lparen error T_RPAREN type_attribute_opt { 1445 $$ = NULL; 1446 } 1447 ; 1448 1449 abstract_decl_lparen: /* specific to lint */ 1450 T_LPAREN { 1451 block_level++; 1452 begin_declaration_level(PROTO_ARG); 1453 } 1454 ; 1455 1456 vararg_parameter_type_list: /* specific to lint */ 1457 parameter_type_list 1458 | parameter_type_list T_COMMA T_ELLIPSIS { 1459 dcs->d_vararg = true; 1460 $$ = $1; 1461 } 1462 | T_ELLIPSIS { 1463 if (sflag) { 1464 /* ANSI C requires formal parameter before '...' */ 1465 error(84); 1466 } else if (!tflag) { 1467 /* ANSI C requires formal parameter before '...' */ 1468 warning(84); 1469 } 1470 dcs->d_vararg = true; 1471 $$ = NULL; 1472 } 1473 ; 1474 1475 /* XXX: C99 6.7.5 defines the same name, but it looks different. */ 1476 parameter_type_list: 1477 parameter_declaration 1478 | parameter_type_list T_COMMA parameter_declaration { 1479 $$ = lnklst($1, $3); 1480 } 1481 ; 1482 1483 /* XXX: C99 6.7.5 defines the same name, but it looks completely different. */ 1484 parameter_declaration: 1485 begin_type_declmods end_type { 1486 /* ^^ There is no check for the missing type-specifier. */ 1487 $$ = declare_argument(abstract_name(), false); 1488 } 1489 | begin_type_declaration_specifiers end_type { 1490 $$ = declare_argument(abstract_name(), false); 1491 } 1492 | begin_type_declmods end_type notype_param_declarator { 1493 /* ^^ There is no check for the missing type-specifier. */ 1494 $$ = declare_argument($3, false); 1495 } 1496 /* 1497 * type_param_declarator is needed because of following conflict: 1498 * "typedef int a; f(int (a));" could be parsed as 1499 * "function with argument a of type int", or 1500 * "function with an abstract argument of type function". 1501 * This grammar realizes the second case. 1502 */ 1503 | begin_type_declaration_specifiers end_type type_param_declarator { 1504 $$ = declare_argument($3, false); 1505 } 1506 | begin_type_declmods end_type abstract_declarator { 1507 /* ^^ There is no check for the missing type-specifier. */ 1508 $$ = declare_argument($3, false); 1509 } 1510 | begin_type_declaration_specifiers end_type abstract_declarator { 1511 $$ = declare_argument($3, false); 1512 } 1513 ; 1514 1515 initializer: /* C99 6.7.8 "Initialization" */ 1516 assignment_expression { 1517 init_expr($1); 1518 } 1519 | init_lbrace init_rbrace { 1520 /* XXX: Empty braces are not covered by C99 6.7.8. */ 1521 } 1522 | init_lbrace initializer_list comma_opt init_rbrace 1523 /* XXX: What is this error handling for? */ 1524 | error 1525 ; 1526 1527 initializer_list: /* C99 6.7.8 "Initialization" */ 1528 initializer_list_item 1529 | initializer_list T_COMMA initializer_list_item 1530 ; 1531 1532 initializer_list_item: /* helper */ 1533 designation initializer 1534 | initializer 1535 ; 1536 1537 designation: /* C99 6.7.8 "Initialization" */ 1538 designator_list T_ASSIGN 1539 | identifier T_COLON { 1540 /* GCC style struct or union member name in initializer */ 1541 gnuism(315); 1542 add_designator_member($1); 1543 } 1544 ; 1545 1546 designator_list: /* C99 6.7.8 "Initialization" */ 1547 designator 1548 | designator_list designator 1549 ; 1550 1551 designator: /* C99 6.7.8 "Initialization" */ 1552 T_LBRACK range T_RBRACK { 1553 add_designator_subscript($2); 1554 if (!Sflag) 1555 /* array initializer with des.s is a C9X feature */ 1556 warning(321); 1557 } 1558 | T_POINT identifier { 1559 if (!Sflag) 1560 /* struct or union member name in initializer is ... */ 1561 warning(313); 1562 add_designator_member($2); 1563 } 1564 ; 1565 1566 range: 1567 constant_expr { 1568 $$.lo = to_int_constant($1, true); 1569 $$.hi = $$.lo; 1570 } 1571 | constant_expr T_ELLIPSIS constant_expr { 1572 $$.lo = to_int_constant($1, true); 1573 $$.hi = to_int_constant($3, true); 1574 /* initialization with '[a...b]' is a GCC extension */ 1575 gnuism(340); 1576 } 1577 ; 1578 1579 init_lbrace: /* helper */ 1580 T_LBRACE { 1581 init_lbrace(); 1582 } 1583 ; 1584 1585 init_rbrace: /* helper */ 1586 T_RBRACE { 1587 init_rbrace(); 1588 } 1589 ; 1590 1591 asm_or_symbolrename_opt: /* GCC extensions */ 1592 /* empty */ { 1593 $$ = NULL; 1594 } 1595 | T_ASM T_LPAREN T_STRING T_RPAREN gcc_attribute_list_opt { 1596 freeyyv(&$3, T_STRING); 1597 $$ = NULL; 1598 } 1599 | T_SYMBOLRENAME T_LPAREN T_NAME T_RPAREN gcc_attribute_list_opt { 1600 $$ = $3; 1601 } 1602 ; 1603 1604 statement: /* C99 6.8 */ 1605 expression_statement 1606 | non_expr_statement 1607 ; 1608 1609 non_expr_statement: /* helper for C99 6.8 */ 1610 type_attribute T_SEMI 1611 | labeled_statement 1612 | compound_statement 1613 | selection_statement 1614 | iteration_statement 1615 | jump_statement { 1616 seen_fallthrough = false; 1617 } 1618 | asm_statement 1619 ; 1620 1621 labeled_statement: /* C99 6.8.1 */ 1622 label type_attribute_opt statement 1623 ; 1624 1625 label: 1626 T_NAME T_COLON { 1627 symtyp = FLABEL; 1628 named_label(getsym($1)); 1629 } 1630 | T_CASE constant_expr T_COLON { 1631 case_label($2); 1632 seen_fallthrough = true; 1633 } 1634 | T_CASE constant_expr T_ELLIPSIS constant_expr T_COLON { 1635 /* XXX: We don't fill all cases */ 1636 case_label($2); 1637 seen_fallthrough = true; 1638 } 1639 | T_DEFAULT T_COLON { 1640 default_label(); 1641 seen_fallthrough = true; 1642 } 1643 ; 1644 1645 compound_statement: /* C99 6.8.2 */ 1646 compound_statement_lbrace compound_statement_rbrace 1647 | compound_statement_lbrace block_item_list compound_statement_rbrace 1648 ; 1649 1650 compound_statement_lbrace: 1651 T_LBRACE { 1652 block_level++; 1653 mem_block_level++; 1654 begin_declaration_level(AUTO); 1655 } 1656 ; 1657 1658 compound_statement_rbrace: 1659 T_RBRACE { 1660 end_declaration_level(); 1661 freeblk(); 1662 mem_block_level--; 1663 block_level--; 1664 seen_fallthrough = false; 1665 } 1666 ; 1667 1668 block_item_list: /* C99 6.8.2 */ 1669 block_item 1670 | block_item_list block_item { 1671 if (!Sflag && $1 && !$2) 1672 /* declarations after statements is a C99 feature */ 1673 c99ism(327); 1674 $$ = $1 || $2; 1675 } 1676 ; 1677 1678 block_item: /* C99 6.8.2 */ 1679 declaration_or_error { 1680 $$ = false; 1681 restore_warning_flags(); 1682 } 1683 | statement { 1684 $$ = true; 1685 restore_warning_flags(); 1686 } 1687 ; 1688 1689 expression_statement: /* C99 6.8.3 */ 1690 expression T_SEMI { 1691 expr($1, false, false, false, false); 1692 seen_fallthrough = false; 1693 } 1694 | T_SEMI { 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(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 expression_opt T_RPAREN { 1813 /* variable declaration in for loop */ 1814 c99ism(325); 1815 for1(NULL, $6, $8); 1816 clear_warning_flags(); 1817 } 1818 | for_start 1819 expression_opt T_SEMI 1820 expression_opt T_SEMI 1821 expression_opt T_RPAREN { 1822 for1($2, $4, $6); 1823 clear_warning_flags(); 1824 } 1825 ; 1826 1827 jump_statement: /* C99 6.8.6 */ 1828 goto identifier T_SEMI { 1829 do_goto(getsym($2)); 1830 } 1831 | goto error T_SEMI { 1832 symtyp = FVFT; 1833 } 1834 | T_CONTINUE T_SEMI { 1835 do_continue(); 1836 } 1837 | T_BREAK T_SEMI { 1838 do_break(); 1839 } 1840 | T_RETURN T_SEMI { 1841 do_return(NULL); 1842 } 1843 | T_RETURN expression T_SEMI { 1844 do_return($2); 1845 } 1846 ; 1847 1848 goto: /* see C99 6.8.6 */ 1849 T_GOTO { 1850 symtyp = FLABEL; 1851 } 1852 ; 1853 1854 asm_statement: /* GCC extension */ 1855 T_ASM T_LPAREN read_until_rparen T_SEMI { 1856 setasm(); 1857 } 1858 | T_ASM T_QUAL T_LPAREN read_until_rparen T_SEMI { 1859 setasm(); 1860 } 1861 | T_ASM error 1862 ; 1863 1864 read_until_rparen: /* helper for 'asm_statement' */ 1865 /* empty */ { 1866 read_until_rparen(); 1867 } 1868 ; 1869 1870 translation_unit: /* C99 6.9 */ 1871 external_declaration 1872 | translation_unit external_declaration 1873 ; 1874 1875 external_declaration: /* C99 6.9 */ 1876 function_definition { 1877 global_clean_up_decl(false); 1878 clear_warning_flags(); 1879 } 1880 | top_level_declaration { 1881 global_clean_up_decl(false); 1882 clear_warning_flags(); 1883 } 1884 | asm_statement /* GCC extension */ 1885 | T_SEMI { /* GCC extension */ 1886 if (sflag) { 1887 /* empty declaration */ 1888 error(0); 1889 } else if (!tflag) { 1890 /* empty declaration */ 1891 warning(0); 1892 } 1893 } 1894 ; 1895 1896 /* 1897 * On the top level, lint allows several forms of declarations that it doesn't 1898 * allow in functions. For example, a single ';' is an empty declaration and 1899 * is supported by some compilers, but in a function it would be an empty 1900 * statement, not a declaration. This makes a difference in C90 mode, where 1901 * a statement must not be followed by a declaration. 1902 * 1903 * See 'declaration' for all other declarations. 1904 */ 1905 top_level_declaration: /* C99 6.9 calls this 'declaration' */ 1906 begin_type end_type notype_init_declarators T_SEMI { 1907 if (sflag) { 1908 /* old style declaration; add 'int' */ 1909 error(1); 1910 } else if (!tflag) { 1911 /* old style declaration; add 'int' */ 1912 warning(1); 1913 } 1914 } 1915 | declaration 1916 | error T_SEMI { 1917 global_clean_up(); 1918 } 1919 | error T_RBRACE { 1920 global_clean_up(); 1921 } 1922 ; 1923 1924 function_definition: /* C99 6.9.1 */ 1925 func_declarator { 1926 if ($1->s_type->t_tspec != FUNC) { 1927 /* syntax error '%s' */ 1928 error(249, yytext); 1929 YYERROR; 1930 } 1931 if ($1->s_type->t_typedef) { 1932 /* ()-less function definition */ 1933 error(64); 1934 YYERROR; 1935 } 1936 funcdef($1); 1937 block_level++; 1938 begin_declaration_level(ARG); 1939 if (lwarn == LWARN_NONE) 1940 $1->s_used = true; 1941 } arg_declaration_list_opt { 1942 end_declaration_level(); 1943 block_level--; 1944 check_func_lint_directives(); 1945 check_func_old_style_arguments(); 1946 begin_control_statement(CS_FUNCTION_BODY); 1947 } compound_statement { 1948 funcend(); 1949 end_control_statement(CS_FUNCTION_BODY); 1950 } 1951 ; 1952 1953 func_declarator: 1954 begin_type end_type notype_declarator { 1955 /* ^^ There is no check for the missing type-specifier. */ 1956 $$ = $3; 1957 } 1958 | begin_type_declmods end_type notype_declarator { 1959 /* ^^ There is no check for the missing type-specifier. */ 1960 $$ = $3; 1961 } 1962 | begin_type_declaration_specifiers end_type type_declarator { 1963 $$ = $3; 1964 } 1965 ; 1966 1967 arg_declaration_list_opt: /* C99 6.9.1p13 example 1 */ 1968 /* empty */ 1969 | arg_declaration_list 1970 ; 1971 1972 arg_declaration_list: /* C99 6.9.1p13 example 1 */ 1973 arg_declaration 1974 | arg_declaration_list arg_declaration 1975 /* XXX or better "arg_declaration error" ? */ 1976 | error 1977 ; 1978 1979 /* 1980 * "arg_declaration" is separated from "declaration" because it 1981 * needs other error handling. 1982 */ 1983 arg_declaration: 1984 begin_type_declmods end_type T_SEMI { 1985 /* empty declaration */ 1986 warning(2); 1987 } 1988 | begin_type_declmods end_type notype_init_declarators T_SEMI 1989 | begin_type_declaration_specifiers end_type T_SEMI { 1990 if (!dcs->d_nonempty_decl) { 1991 /* empty declaration */ 1992 warning(2); 1993 } else { 1994 /* '%s' declared in argument declaration list */ 1995 warning(3, type_name(dcs->d_type)); 1996 } 1997 } 1998 | begin_type_declaration_specifiers end_type 1999 type_init_declarators T_SEMI { 2000 if (dcs->d_nonempty_decl) { 2001 /* '%s' declared in argument declaration list */ 2002 warning(3, type_name(dcs->d_type)); 2003 } 2004 } 2005 | begin_type_declmods error 2006 | begin_type_declaration_specifiers error 2007 ; 2008 2009 gcc_attribute_list_opt: 2010 /* empty */ 2011 | gcc_attribute_list 2012 ; 2013 2014 gcc_attribute_list: 2015 gcc_attribute 2016 | gcc_attribute_list gcc_attribute 2017 ; 2018 2019 gcc_attribute: 2020 T_ATTRIBUTE T_LPAREN T_LPAREN { 2021 attron = true; 2022 } gcc_attribute_spec_list { 2023 attron = false; 2024 } T_RPAREN T_RPAREN 2025 ; 2026 2027 gcc_attribute_spec_list: 2028 gcc_attribute_spec 2029 | gcc_attribute_spec_list T_COMMA gcc_attribute_spec 2030 ; 2031 2032 gcc_attribute_spec: 2033 /* empty */ 2034 | T_AT_ALWAYS_INLINE 2035 | T_AT_ALIAS T_LPAREN string T_RPAREN 2036 | T_AT_ALIGNED T_LPAREN constant_expr T_RPAREN 2037 | T_AT_ALIGNED 2038 | T_AT_ALLOC_SIZE T_LPAREN constant_expr T_COMMA constant_expr T_RPAREN 2039 | T_AT_ALLOC_SIZE T_LPAREN constant_expr T_RPAREN 2040 | T_AT_BOUNDED T_LPAREN gcc_attribute_bounded 2041 T_COMMA constant_expr T_COMMA constant_expr T_RPAREN 2042 | T_AT_COLD 2043 | T_AT_COMMON 2044 | T_AT_CONSTRUCTOR T_LPAREN constant_expr T_RPAREN 2045 | T_AT_CONSTRUCTOR 2046 | T_AT_DEPRECATED T_LPAREN string T_RPAREN 2047 | T_AT_DEPRECATED 2048 | T_AT_DESTRUCTOR T_LPAREN constant_expr T_RPAREN 2049 | T_AT_DESTRUCTOR 2050 | T_AT_FALLTHROUGH { 2051 fallthru(1); 2052 } 2053 | T_AT_FORMAT T_LPAREN gcc_attribute_format T_COMMA 2054 constant_expr T_COMMA constant_expr T_RPAREN 2055 | T_AT_FORMAT_ARG T_LPAREN constant_expr T_RPAREN 2056 | T_AT_GNU_INLINE 2057 | T_AT_HOT 2058 | T_AT_MALLOC 2059 | T_AT_MAY_ALIAS 2060 | T_AT_MODE T_LPAREN T_NAME T_RPAREN 2061 | T_AT_NOINLINE 2062 | T_AT_NONNULL T_LPAREN constant_expr_list_opt T_RPAREN 2063 | T_AT_NONNULL 2064 | T_AT_NONSTRING 2065 | T_AT_NORETURN 2066 | T_AT_NOTHROW 2067 | T_AT_NO_INSTRUMENT_FUNCTION 2068 | T_AT_OPTIMIZE T_LPAREN string T_RPAREN 2069 | T_AT_PACKED { 2070 addpacked(); 2071 } 2072 | T_AT_PCS T_LPAREN string T_RPAREN 2073 | T_AT_PURE 2074 | T_AT_RETURNS_TWICE 2075 | T_AT_SECTION T_LPAREN string T_RPAREN 2076 | T_AT_SENTINEL T_LPAREN constant_expr T_RPAREN 2077 | T_AT_SENTINEL 2078 | T_AT_TLS_MODEL T_LPAREN string T_RPAREN 2079 | T_AT_TUNION 2080 | T_AT_UNUSED { 2081 add_attr_used(); 2082 } 2083 | T_AT_USED { 2084 add_attr_used(); 2085 } 2086 | T_AT_VISIBILITY T_LPAREN constant_expr T_RPAREN 2087 | T_AT_WARN_UNUSED_RESULT 2088 | T_AT_WEAK 2089 | T_QUAL { 2090 if ($1 != CONST) 2091 yyerror("Bad attribute"); 2092 } 2093 ; 2094 2095 gcc_attribute_bounded: 2096 T_AT_MINBYTES 2097 | T_AT_STRING 2098 | T_AT_BUFFER 2099 ; 2100 2101 gcc_attribute_format: 2102 T_AT_FORMAT_GNU_PRINTF 2103 | T_AT_FORMAT_PRINTF 2104 | T_AT_FORMAT_SCANF 2105 | T_AT_FORMAT_STRFMON 2106 | T_AT_FORMAT_STRFTIME 2107 | T_AT_FORMAT_SYSLOG 2108 ; 2109 2110 %% 2111 2112 /* ARGSUSED */ 2113 int 2114 yyerror(const char *msg) 2115 { 2116 /* syntax error '%s' */ 2117 error(249, yytext); 2118 if (++sytxerr >= 5) 2119 norecover(); 2120 return 0; 2121 } 2122 2123 static void 2124 cgram_declare(sym_t *decl, bool initflg, sbuf_t *renaming) 2125 { 2126 declare(decl, initflg, renaming); 2127 if (renaming != NULL) 2128 freeyyv(&renaming, T_NAME); 2129 } 2130 2131 /* 2132 * Discard all input tokens up to and including the next 2133 * unmatched right paren 2134 */ 2135 static void 2136 read_until_rparen(void) 2137 { 2138 int level; 2139 2140 if (yychar < 0) 2141 yychar = yylex(); 2142 freeyyv(&yylval, yychar); 2143 2144 level = 1; 2145 while (yychar != T_RPAREN || --level > 0) { 2146 if (yychar == T_LPAREN) { 2147 level++; 2148 } else if (yychar <= 0) { 2149 break; 2150 } 2151 freeyyv(&yylval, yychar = yylex()); 2152 } 2153 2154 yyclearin; 2155 } 2156 2157 static sym_t * 2158 symbolrename(sym_t *s, sbuf_t *sb) 2159 { 2160 if (sb != NULL) 2161 s->s_rename = sb->sb_name; 2162 return s; 2163 } 2164
Indexes created Fri Oct 03 02:09:57 GMT 2025