cgram.y revision 1.351
1 %{ 2 /* $NetBSD: cgram.y,v 1.351 2021/07/27 05:52:53 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 1.351 2021/07/27 05:52:53 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 %right T_QUEST T_COLON 264 %left T_LOGOR 265 %left T_LOGAND 266 %left T_BITOR 267 %left T_BITXOR 268 %left T_AMPER 269 %left T_EQUALITY 270 %left T_RELATIONAL 271 %left T_SHIFT 272 %left T_ADDITIVE 273 %left T_ASTERISK T_MULTIPLICATIVE 274 275 %token <y_name> T_NAME 276 %token <y_name> T_TYPENAME 277 %token <y_val> T_CON 278 %token <y_string> T_STRING 279 280 %type <y_sym> identifier_sym 281 %type <y_name> identifier 282 %type <y_string> string 283 %type <y_string> string2 284 285 %type <y_tnode> primary_expression 286 %type <y_tnode> generic_selection 287 %type <y_generic> generic_assoc_list 288 %type <y_generic> generic_association 289 %type <y_tnode> postfix_expression 290 %type <y_tnode> gcc_statement_expr_list 291 %type <y_tnode> gcc_statement_expr_item 292 %type <y_op> point_or_arrow 293 %type <y_tnode> argument_expression_list 294 %type <y_tnode> unary_expression 295 %type <y_tnode> cast_expression 296 %type <y_tnode> conditional_expression 297 %type <y_tnode> assignment_expression 298 %type <y_tnode> expression_opt 299 %type <y_tnode> expression 300 %type <y_tnode> constant_expr 301 302 %type <y_type> begin_type_typespec 303 %type <y_type> type_specifier 304 %type <y_type> notype_type_specifier 305 %type <y_type> struct_or_union_specifier 306 %type <y_tspec> struct_or_union 307 %type <y_sym> braced_struct_declaration_list 308 %type <y_sym> struct_declaration_list_with_rbrace 309 %type <y_sym> struct_declaration_list 310 %type <y_sym> struct_declaration 311 %type <y_sym> notype_struct_declarators 312 %type <y_sym> type_struct_declarators 313 %type <y_sym> notype_struct_declarator 314 %type <y_sym> type_struct_declarator 315 %type <y_type> enum_specifier 316 %type <y_sym> enum_declaration 317 %type <y_sym> enums_with_opt_comma 318 %type <y_sym> enumerator_list 319 %type <y_sym> enumerator 320 %type <y_qual_ptr> type_qualifier 321 %type <y_qual_ptr> pointer 322 %type <y_qual_ptr> asterisk 323 %type <y_qual_ptr> type_qualifier_list_opt 324 %type <y_qual_ptr> type_qualifier_list 325 %type <y_sym> notype_declarator 326 %type <y_sym> type_declarator 327 %type <y_sym> notype_direct_declarator 328 %type <y_sym> type_direct_declarator 329 %type <y_sym> type_param_declarator 330 %type <y_sym> notype_param_declarator 331 %type <y_sym> direct_param_declarator 332 %type <y_sym> direct_notype_param_declarator 333 %type <y_sym> param_list 334 %type <y_tnode> array_size 335 %type <y_sym> identifier_list 336 %type <y_type> type_name 337 %type <y_sym> abstract_declaration 338 %type <y_sym> abstract_declarator 339 %type <y_sym> direct_abstract_declarator 340 %type <y_sym> abstract_decl_param_list 341 %type <y_sym> vararg_parameter_type_list 342 %type <y_sym> parameter_type_list 343 %type <y_sym> parameter_declaration 344 %type <y_range> range 345 %type <y_name> asm_or_symbolrename_opt 346 347 %type <y_seen_statement> block_item_list 348 %type <y_seen_statement> block_item 349 %type <y_tnode> do_while_expr 350 %type <y_sym> func_declarator 351 352 %% 353 354 program: 355 /* empty */ { 356 if (sflag) { 357 /* empty translation unit */ 358 error(272); 359 } else if (!tflag) { 360 /* empty translation unit */ 361 warning(272); 362 } 363 } 364 | translation_unit 365 ; 366 367 identifier_sym: /* helper for struct/union/enum */ 368 identifier { 369 $$ = getsym($1); 370 } 371 ; 372 373 /* K&R ???, C90 ???, C99 6.4.2.1, C11 ??? */ 374 identifier: 375 T_NAME { 376 cgram_debug("name '%s'", $1->sb_name); 377 $$ = $1; 378 } 379 | T_TYPENAME { 380 cgram_debug("typename '%s'", $1->sb_name); 381 $$ = $1; 382 } 383 ; 384 385 /* see C99 6.4.5, string literals are joined by 5.1.1.2 */ 386 string: 387 T_STRING 388 | T_STRING string2 { 389 $$ = cat_strings($1, $2); 390 } 391 ; 392 393 /* see C99 6.4.5, string literals are joined by 5.1.1.2 */ 394 string2: 395 T_STRING { 396 if (tflag) { 397 /* concatenated strings are illegal in traditional C */ 398 warning(219); 399 } 400 $$ = $1; 401 } 402 | string2 T_STRING { 403 $$ = cat_strings($1, $2); 404 } 405 ; 406 407 /* K&R 7.1, C90 ???, C99 6.5.1, C11 6.5.1 */ 408 primary_expression: 409 T_NAME { 410 /* XXX really necessary? */ 411 if (yychar < 0) 412 yychar = yylex(); 413 $$ = build_name(getsym($1), yychar); 414 } 415 | T_CON { 416 $$ = build_constant(gettyp($1->v_tspec), $1); 417 } 418 | string { 419 $$ = build_string($1); 420 } 421 | T_LPAREN expression T_RPAREN { 422 if ($2 != NULL) 423 $2->tn_parenthesized = true; 424 $$ = $2; 425 } 426 | generic_selection 427 /* GCC primary-expression, see c_parser_postfix_expression */ 428 | T_BUILTIN_OFFSETOF T_LPAREN type_name T_COMMA identifier T_RPAREN { 429 symtyp = FMEMBER; 430 $$ = build_offsetof($3, getsym($5)); 431 } 432 ; 433 434 /* K&R ---, C90 ---, C99 ---, C11 6.5.1.1 */ 435 generic_selection: 436 T_GENERIC T_LPAREN assignment_expression T_COMMA 437 generic_assoc_list T_RPAREN { 438 /* generic selection requires C11 or later */ 439 c11ism(345); 440 $$ = build_generic_selection($3, $5); 441 } 442 ; 443 444 /* K&R ---, C90 ---, C99 ---, C11 6.5.1.1 */ 445 generic_assoc_list: 446 generic_association 447 | generic_assoc_list T_COMMA generic_association { 448 $3->ga_prev = $1; 449 $$ = $3; 450 } 451 ; 452 453 /* K&R ---, C90 ---, C99 ---, C11 6.5.1.1 */ 454 generic_association: 455 type_name T_COLON assignment_expression { 456 $$ = getblk(sizeof(*$$)); 457 $$->ga_arg = $1; 458 $$->ga_result = $3; 459 } 460 | T_DEFAULT T_COLON assignment_expression { 461 $$ = getblk(sizeof(*$$)); 462 $$->ga_arg = NULL; 463 $$->ga_result = $3; 464 } 465 ; 466 467 /* K&R 7.1, C90 ???, C99 6.5.2, C11 6.5.2 */ 468 postfix_expression: 469 primary_expression 470 | postfix_expression T_LBRACK expression T_RBRACK { 471 $$ = build_unary(INDIR, build_binary($1, PLUS, $3)); 472 } 473 | postfix_expression T_LPAREN T_RPAREN { 474 $$ = build_function_call($1, NULL); 475 } 476 | postfix_expression T_LPAREN argument_expression_list T_RPAREN { 477 $$ = build_function_call($1, $3); 478 } 479 | postfix_expression point_or_arrow T_NAME { 480 $$ = build_member_access($1, $2, $3); 481 } 482 | postfix_expression T_INCDEC { 483 $$ = build_unary($2 == INC ? INCAFT : DECAFT, $1); 484 } 485 | T_LPAREN type_name T_RPAREN { /* C99 6.5.2.5 "Compound literals" */ 486 sym_t *tmp = mktempsym($2); 487 begin_initialization(tmp); 488 cgram_declare(tmp, true, NULL); 489 } init_lbrace initializer_list comma_opt init_rbrace { 490 if (!Sflag) 491 /* compound literals are a C9X/GCC extension */ 492 gnuism(319); 493 $$ = build_name(*current_initsym(), 0); 494 end_initialization(); 495 } 496 | T_LPAREN compound_statement_lbrace gcc_statement_expr_list { 497 block_level--; 498 mem_block_level--; 499 begin_initialization(mktempsym(dup_type($3->tn_type))); 500 mem_block_level++; 501 block_level++; 502 /* ({ }) is a GCC extension */ 503 gnuism(320); 504 } compound_statement_rbrace T_RPAREN { 505 $$ = build_name(*current_initsym(), 0); 506 end_initialization(); 507 } 508 ; 509 510 comma_opt: /* helper for 'postfix_expression' */ 511 /* empty */ 512 | T_COMMA 513 ; 514 515 /* 516 * The inner part of a GCC statement-expression of the form ({ ... }). 517 * 518 * https://gcc.gnu.org/onlinedocs/gcc/Statement-Exprs.html 519 */ 520 gcc_statement_expr_list: 521 gcc_statement_expr_item 522 | gcc_statement_expr_list gcc_statement_expr_item { 523 $$ = $2; 524 } 525 ; 526 527 gcc_statement_expr_item: 528 declaration_or_error { 529 clear_warning_flags(); 530 $$ = NULL; 531 } 532 | non_expr_statement { 533 $$ = expr_zalloc_tnode(); 534 $$->tn_type = gettyp(VOID); 535 } 536 | expression T_SEMI { 537 if ($1 == NULL) { /* in case of syntax errors */ 538 $$ = expr_zalloc_tnode(); 539 $$->tn_type = gettyp(VOID); 540 } else { 541 /* XXX: do that only on the last name */ 542 if ($1->tn_op == NAME) 543 $1->tn_sym->s_used = true; 544 expr($1, false, false, false, false); 545 seen_fallthrough = false; 546 $$ = $1; 547 } 548 } 549 ; 550 551 point_or_arrow: /* helper for 'postfix_expression' */ 552 T_POINT { 553 symtyp = FMEMBER; 554 $$ = POINT; 555 } 556 | T_ARROW { 557 symtyp = FMEMBER; 558 $$ = ARROW; 559 } 560 ; 561 562 /* K&R 7.1, C90 ???, C99 6.5.2, C11 6.5.2 */ 563 argument_expression_list: 564 assignment_expression { 565 $$ = build_function_argument(NULL, $1); 566 } 567 | argument_expression_list T_COMMA assignment_expression { 568 $$ = build_function_argument($1, $3); 569 } 570 ; 571 572 /* K&R 7.2, C90 ???, C99 6.5.3, C11 6.5.3 */ 573 unary_expression: 574 postfix_expression 575 | T_INCDEC unary_expression { 576 $$ = build_unary($1 == INC ? INCBEF : DECBEF, $2); 577 } 578 | T_AMPER cast_expression { 579 $$ = build_unary(ADDR, $2); 580 } 581 | T_ASTERISK cast_expression { 582 $$ = build_unary(INDIR, $2); 583 } 584 | T_ADDITIVE cast_expression { 585 if (tflag && $1 == PLUS) { 586 /* unary + is illegal in traditional C */ 587 warning(100); 588 } 589 $$ = build_unary($1 == PLUS ? UPLUS : UMINUS, $2); 590 } 591 | T_COMPLEMENT cast_expression { 592 $$ = build_unary(COMPL, $2); 593 } 594 | T_LOGNOT cast_expression { 595 $$ = build_unary(NOT, $2); 596 } 597 | T_REAL cast_expression { /* GCC c_parser_unary_expression */ 598 $$ = build_unary(REAL, $2); 599 } 600 | T_IMAG cast_expression { /* GCC c_parser_unary_expression */ 601 $$ = build_unary(IMAG, $2); 602 } 603 | T_EXTENSION cast_expression { /* GCC c_parser_unary_expression */ 604 $$ = $2; 605 } 606 | T_SIZEOF unary_expression { 607 $$ = $2 == NULL ? NULL : build_sizeof($2->tn_type); 608 if ($$ != NULL) 609 check_expr_misc($2, 610 false, false, false, false, false, true); 611 } 612 | T_SIZEOF T_LPAREN type_name T_RPAREN { 613 $$ = build_sizeof($3); 614 } 615 /* K&R ---, C90 ---, C99 ---, C11 6.5.3 */ 616 | T_ALIGNOF T_LPAREN type_name T_RPAREN { 617 /* TODO: c11ism */ 618 $$ = build_alignof($3); 619 } 620 ; 621 622 /* The rule 'unary_operator' is inlined into unary_expression. */ 623 624 /* K&R 7.2, C90 ???, C99 6.5.4, C11 6.5.4 */ 625 cast_expression: 626 unary_expression 627 | T_LPAREN type_name T_RPAREN cast_expression { 628 $$ = cast($4, $2); 629 } 630 ; 631 632 expression_opt: 633 /* empty */ { 634 $$ = NULL; 635 } 636 | expression 637 ; 638 639 /* 'conditional_expression' also implements 'multiplicative_expression'. */ 640 /* 'conditional_expression' also implements 'additive_expression'. */ 641 /* 'conditional_expression' also implements 'shift_expression'. */ 642 /* 'conditional_expression' also implements 'relational_expression'. */ 643 /* 'conditional_expression' also implements 'equality_expression'. */ 644 /* 'conditional_expression' also implements 'AND_expression'. */ 645 /* 'conditional_expression' also implements 'exclusive_OR_expression'. */ 646 /* 'conditional_expression' also implements 'inclusive_OR_expression'. */ 647 /* 'conditional_expression' also implements 'logical_AND_expression'. */ 648 /* 'conditional_expression' also implements 'logical_OR_expression'. */ 649 /* K&R ???, C90 ???, C99 6.5.5 to 6.5.15, C11 6.5.5 to 6.5.15 */ 650 conditional_expression: 651 cast_expression 652 | conditional_expression T_ASTERISK conditional_expression { 653 $$ = build_binary($1, MULT, $3); 654 } 655 | conditional_expression T_MULTIPLICATIVE conditional_expression { 656 $$ = build_binary($1, $2, $3); 657 } 658 | conditional_expression T_ADDITIVE conditional_expression { 659 $$ = build_binary($1, $2, $3); 660 } 661 | conditional_expression T_SHIFT conditional_expression { 662 $$ = build_binary($1, $2, $3); 663 } 664 | conditional_expression T_RELATIONAL conditional_expression { 665 $$ = build_binary($1, $2, $3); 666 } 667 | conditional_expression T_EQUALITY conditional_expression { 668 $$ = build_binary($1, $2, $3); 669 } 670 | conditional_expression T_AMPER conditional_expression { 671 $$ = build_binary($1, BITAND, $3); 672 } 673 | conditional_expression T_BITXOR conditional_expression { 674 $$ = build_binary($1, BITXOR, $3); 675 } 676 | conditional_expression T_BITOR conditional_expression { 677 $$ = build_binary($1, BITOR, $3); 678 } 679 | conditional_expression T_LOGAND conditional_expression { 680 $$ = build_binary($1, LOGAND, $3); 681 } 682 | conditional_expression T_LOGOR conditional_expression { 683 $$ = build_binary($1, LOGOR, $3); 684 } 685 | conditional_expression T_QUEST expression 686 T_COLON conditional_expression { 687 $$ = build_binary($1, QUEST, build_binary($3, COLON, $5)); 688 } 689 ; 690 691 /* K&R ???, C90 ???, C99 6.5.16, C11 6.5.16 */ 692 assignment_expression: 693 conditional_expression 694 | unary_expression T_ASSIGN assignment_expression { 695 $$ = build_binary($1, ASSIGN, $3); 696 } 697 | unary_expression T_OPASSIGN assignment_expression { 698 $$ = build_binary($1, $2, $3); 699 } 700 ; 701 702 /* K&R ???, C90 ???, C99 6.5.17, C11 6.5.17 */ 703 expression: 704 assignment_expression 705 | expression T_COMMA assignment_expression { 706 $$ = build_binary($1, COMMA, $3); 707 } 708 ; 709 710 constant_expr_list_opt: /* helper for gcc_attribute */ 711 /* empty */ 712 | constant_expr_list 713 ; 714 715 constant_expr_list: /* helper for gcc_attribute */ 716 constant_expr 717 | constant_expr_list T_COMMA constant_expr 718 ; 719 720 constant_expr: /* C99 6.6 */ 721 conditional_expression 722 ; 723 724 declaration_or_error: 725 declaration 726 | error T_SEMI 727 ; 728 729 declaration: /* C99 6.7 */ 730 begin_type_declmods end_type T_SEMI { 731 if (dcs->d_scl == TYPEDEF) { 732 /* typedef declares no type name */ 733 warning(72); 734 } else { 735 /* empty declaration */ 736 warning(2); 737 } 738 } 739 | begin_type_declmods end_type notype_init_declarators T_SEMI 740 /* ^^ There is no check for the missing type-specifier. */ 741 | begin_type_declaration_specifiers end_type T_SEMI { 742 if (dcs->d_scl == TYPEDEF) { 743 /* typedef declares no type name */ 744 warning(72); 745 } else if (!dcs->d_nonempty_decl) { 746 /* empty declaration */ 747 warning(2); 748 } 749 } 750 | begin_type_declaration_specifiers end_type 751 type_init_declarators T_SEMI 752 ; 753 754 begin_type_declaration_specifiers: /* see C99 6.7 */ 755 begin_type_typespec { 756 add_type($1); 757 } 758 | begin_type_declmods type_specifier { 759 add_type($2); 760 } 761 | type_attribute begin_type_declaration_specifiers 762 | begin_type_declaration_specifiers declmod 763 | begin_type_declaration_specifiers notype_type_specifier { 764 add_type($2); 765 } 766 ; 767 768 begin_type_declmods: /* see C99 6.7 */ 769 begin_type T_QUAL { 770 add_qualifier($2); 771 } 772 | begin_type T_SCLASS { 773 add_storage_class($2); 774 } 775 | begin_type_declmods declmod 776 ; 777 778 begin_type_specifier_qualifier_list: /* see C11 6.7.2.1 */ 779 begin_type_specifier_qualifier_list_postfix 780 | type_attribute_list begin_type_specifier_qualifier_list_postfix 781 ; 782 783 begin_type_specifier_qualifier_list_postfix: 784 begin_type_typespec { 785 add_type($1); 786 } 787 | begin_type_qualifier_list type_specifier { 788 add_type($2); 789 } 790 | begin_type_specifier_qualifier_list_postfix T_QUAL { 791 add_qualifier($2); 792 } 793 | begin_type_specifier_qualifier_list_postfix notype_type_specifier { 794 add_type($2); 795 } 796 | begin_type_specifier_qualifier_list_postfix type_attribute 797 ; 798 799 begin_type_typespec: 800 begin_type notype_type_specifier { 801 $$ = $2; 802 } 803 | T_TYPENAME begin_type { 804 $$ = getsym($1)->s_type; 805 } 806 ; 807 808 begin_type_qualifier_list: 809 begin_type T_QUAL { 810 add_qualifier($2); 811 } 812 | begin_type_qualifier_list T_QUAL { 813 add_qualifier($2); 814 } 815 ; 816 817 declmod: 818 T_QUAL { 819 add_qualifier($1); 820 } 821 | T_SCLASS { 822 add_storage_class($1); 823 } 824 | type_attribute_list 825 ; 826 827 type_attribute_list: 828 type_attribute 829 | type_attribute_list type_attribute 830 ; 831 832 type_attribute_opt: 833 /* empty */ 834 | type_attribute 835 ; 836 837 type_attribute: /* See C11 6.7 declaration-specifiers */ 838 gcc_attribute 839 | T_ALIGNAS T_LPAREN type_specifier T_RPAREN /* C11 6.7.5 */ 840 | T_ALIGNAS T_LPAREN constant_expr T_RPAREN /* C11 6.7.5 */ 841 | T_PACKED { 842 addpacked(); 843 } 844 | T_NORETURN 845 ; 846 847 begin_type: 848 /* empty */ { 849 begin_type(); 850 } 851 ; 852 853 end_type: 854 /* empty */ { 855 end_type(); 856 } 857 ; 858 859 type_specifier: /* C99 6.7.2 */ 860 notype_type_specifier 861 | T_TYPENAME { 862 $$ = getsym($1)->s_type; 863 } 864 ; 865 866 notype_type_specifier: /* see C99 6.7.2 */ 867 T_TYPE { 868 $$ = gettyp($1); 869 } 870 | T_TYPEOF T_LPAREN expression T_RPAREN { /* GCC extension */ 871 $$ = $3->tn_type; 872 } 873 | struct_or_union_specifier { 874 end_declaration_level(); 875 $$ = $1; 876 } 877 | enum_specifier { 878 end_declaration_level(); 879 $$ = $1; 880 } 881 ; 882 883 struct_or_union_specifier: /* C99 6.7.2.1 */ 884 struct_or_union identifier_sym { 885 /* 886 * STDC requires that "struct a;" always introduces 887 * a new tag if "a" is not declared at current level 888 * 889 * yychar is valid because otherwise the parser would not 890 * have been able to decide if it must shift or reduce 891 */ 892 $$ = mktag($2, $1, false, yychar == T_SEMI); 893 } 894 | struct_or_union identifier_sym { 895 dcs->d_tagtyp = mktag($2, $1, true, false); 896 } braced_struct_declaration_list { 897 $$ = complete_tag_struct_or_union(dcs->d_tagtyp, $4); 898 } 899 | struct_or_union { 900 dcs->d_tagtyp = mktag(NULL, $1, true, false); 901 } braced_struct_declaration_list { 902 $$ = complete_tag_struct_or_union(dcs->d_tagtyp, $3); 903 } 904 | struct_or_union error { 905 symtyp = FVFT; 906 $$ = gettyp(INT); 907 } 908 ; 909 910 struct_or_union: /* C99 6.7.2.1 */ 911 T_STRUCT_OR_UNION { 912 symtyp = FTAG; 913 begin_declaration_level($1 == STRUCT ? MOS : MOU); 914 dcs->d_offset = 0; 915 dcs->d_sou_align_in_bits = CHAR_SIZE; 916 $$ = $1; 917 } 918 | struct_or_union type_attribute 919 ; 920 921 braced_struct_declaration_list: /* see C99 6.7.2.1 */ 922 struct_declaration_lbrace struct_declaration_list_with_rbrace { 923 $$ = $2; 924 } 925 ; 926 927 struct_declaration_lbrace: /* see C99 6.7.2.1 */ 928 T_LBRACE { 929 symtyp = FVFT; 930 } 931 ; 932 933 struct_declaration_list_with_rbrace: /* see C99 6.7.2.1 */ 934 struct_declaration_list T_RBRACE 935 | T_RBRACE { 936 /* XXX: This is not allowed by any C standard. */ 937 $$ = NULL; 938 } 939 ; 940 941 struct_declaration_list: /* C99 6.7.2.1 */ 942 struct_declaration 943 | struct_declaration_list struct_declaration { 944 $$ = lnklst($1, $2); 945 } 946 ; 947 948 struct_declaration: /* C99 6.7.2.1 */ 949 begin_type_qualifier_list end_type { 950 /* ^^ There is no check for the missing type-specifier. */ 951 /* too late, i know, but getsym() compensates it */ 952 symtyp = FMEMBER; 953 } notype_struct_declarators type_attribute_opt T_SEMI { 954 symtyp = FVFT; 955 $$ = $4; 956 } 957 | begin_type_specifier_qualifier_list end_type { 958 symtyp = FMEMBER; 959 } type_struct_declarators type_attribute_opt T_SEMI { 960 symtyp = FVFT; 961 $$ = $4; 962 } 963 | begin_type_qualifier_list end_type type_attribute_opt T_SEMI { 964 /* syntax error '%s' */ 965 error(249, "member without type"); 966 $$ = NULL; 967 } 968 | begin_type_specifier_qualifier_list end_type type_attribute_opt 969 T_SEMI { 970 symtyp = FVFT; 971 if (!Sflag) 972 /* anonymous struct/union members is a C9X feature */ 973 warning(49); 974 if (is_struct_or_union(dcs->d_type->t_tspec)) { 975 $$ = dcs->d_type->t_str->sou_first_member; 976 /* add all the members of the anonymous struct/union */ 977 anonymize($$); 978 } else { 979 /* syntax error '%s' */ 980 error(249, "unnamed member"); 981 $$ = NULL; 982 } 983 } 984 | error T_SEMI { 985 symtyp = FVFT; 986 $$ = NULL; 987 } 988 ; 989 990 notype_struct_declarators: 991 notype_struct_declarator { 992 $$ = declarator_1_struct_union($1); 993 } 994 | notype_struct_declarators { 995 symtyp = FMEMBER; 996 } T_COMMA type_struct_declarator { 997 $$ = lnklst($1, declarator_1_struct_union($4)); 998 } 999 ; 1000 1001 type_struct_declarators: 1002 type_struct_declarator { 1003 $$ = declarator_1_struct_union($1); 1004 } 1005 | type_struct_declarators { 1006 symtyp = FMEMBER; 1007 } T_COMMA type_struct_declarator { 1008 $$ = lnklst($1, declarator_1_struct_union($4)); 1009 } 1010 ; 1011 1012 notype_struct_declarator: 1013 notype_declarator 1014 | notype_declarator T_COLON constant_expr { /* C99 6.7.2.1 */ 1015 $$ = bitfield($1, to_int_constant($3, true)); 1016 } 1017 | { 1018 symtyp = FVFT; 1019 } T_COLON constant_expr { /* C99 6.7.2.1 */ 1020 $$ = bitfield(NULL, to_int_constant($3, true)); 1021 } 1022 ; 1023 1024 type_struct_declarator: 1025 type_declarator 1026 | type_declarator T_COLON constant_expr { 1027 $$ = bitfield($1, to_int_constant($3, true)); 1028 } 1029 | { 1030 symtyp = FVFT; 1031 } T_COLON constant_expr { 1032 $$ = bitfield(NULL, to_int_constant($3, true)); 1033 } 1034 ; 1035 1036 enum_specifier: /* C99 6.7.2.2 */ 1037 enum gcc_attribute_list_opt identifier_sym { 1038 $$ = mktag($3, ENUM, false, false); 1039 } 1040 | enum gcc_attribute_list_opt identifier_sym { 1041 dcs->d_tagtyp = mktag($3, ENUM, true, false); 1042 } enum_declaration /*gcc_attribute_list_opt*/ { 1043 $$ = complete_tag_enum(dcs->d_tagtyp, $5); 1044 } 1045 | enum gcc_attribute_list_opt { 1046 dcs->d_tagtyp = mktag(NULL, ENUM, true, false); 1047 } enum_declaration /*gcc_attribute_list_opt*/ { 1048 $$ = complete_tag_enum(dcs->d_tagtyp, $4); 1049 } 1050 | enum error { 1051 symtyp = FVFT; 1052 $$ = gettyp(INT); 1053 } 1054 ; 1055 1056 enum: /* helper for C99 6.7.2.2 */ 1057 T_ENUM { 1058 symtyp = FTAG; 1059 begin_declaration_level(CTCONST); 1060 } 1061 ; 1062 1063 enum_declaration: /* helper for C99 6.7.2.2 */ 1064 enum_decl_lbrace enums_with_opt_comma T_RBRACE { 1065 $$ = $2; 1066 } 1067 ; 1068 1069 enum_decl_lbrace: /* helper for C99 6.7.2.2 */ 1070 T_LBRACE { 1071 symtyp = FVFT; 1072 enumval = 0; 1073 } 1074 ; 1075 1076 enums_with_opt_comma: /* helper for C99 6.7.2.2 */ 1077 enumerator_list 1078 | enumerator_list T_COMMA { 1079 if (sflag) { 1080 /* trailing ',' prohibited in enum declaration */ 1081 error(54); 1082 } else { 1083 /* trailing ',' prohibited in enum declaration */ 1084 c99ism(54); 1085 } 1086 $$ = $1; 1087 } 1088 ; 1089 1090 enumerator_list: /* C99 6.7.2.2 */ 1091 enumerator 1092 | enumerator_list T_COMMA enumerator { 1093 $$ = lnklst($1, $3); 1094 } 1095 | error { 1096 $$ = NULL; 1097 } 1098 ; 1099 1100 enumerator: /* C99 6.7.2.2 */ 1101 identifier_sym gcc_attribute_list_opt { 1102 $$ = enumeration_constant($1, enumval, true); 1103 } 1104 | identifier_sym gcc_attribute_list_opt T_ASSIGN constant_expr { 1105 $$ = enumeration_constant($1, to_int_constant($4, true), 1106 false); 1107 } 1108 ; 1109 1110 type_qualifier: /* C99 6.7.3 */ 1111 T_QUAL { 1112 $$ = xcalloc(1, sizeof(*$$)); 1113 if ($1 == CONST) 1114 $$->p_const = true; 1115 if ($1 == VOLATILE) 1116 $$->p_volatile = true; 1117 } 1118 ; 1119 1120 pointer: /* C99 6.7.5 */ 1121 asterisk type_qualifier_list_opt { 1122 $$ = merge_qualified_pointer($1, $2); 1123 } 1124 | asterisk type_qualifier_list_opt pointer { 1125 $$ = merge_qualified_pointer($1, $2); 1126 $$ = merge_qualified_pointer($$, $3); 1127 } 1128 ; 1129 1130 asterisk: /* helper for 'pointer' */ 1131 T_ASTERISK { 1132 $$ = xcalloc(1, sizeof(*$$)); 1133 $$->p_pointer = true; 1134 } 1135 ; 1136 1137 type_qualifier_list_opt: /* see C99 6.7.5 */ 1138 /* empty */ { 1139 $$ = NULL; 1140 } 1141 | type_qualifier_list 1142 ; 1143 1144 type_qualifier_list: /* C99 6.7.5 */ 1145 type_qualifier 1146 | type_qualifier_list type_qualifier { 1147 $$ = merge_qualified_pointer($1, $2); 1148 } 1149 ; 1150 1151 /* 1152 * For an explanation of 'notype' in the following rules, see 1153 * https://www.gnu.org/software/bison/manual/bison.html#Semantic-Tokens. 1154 */ 1155 1156 notype_init_declarators: 1157 notype_init_declarator 1158 | notype_init_declarators T_COMMA type_init_declarator 1159 ; 1160 1161 type_init_declarators: 1162 type_init_declarator 1163 | type_init_declarators T_COMMA type_init_declarator 1164 ; 1165 1166 notype_init_declarator: 1167 notype_declarator asm_or_symbolrename_opt { 1168 cgram_declare($1, false, $2); 1169 check_size($1); 1170 } 1171 | notype_declarator asm_or_symbolrename_opt { 1172 begin_initialization($1); 1173 cgram_declare($1, true, $2); 1174 } T_ASSIGN initializer { 1175 check_size($1); 1176 end_initialization(); 1177 } 1178 ; 1179 1180 type_init_declarator: 1181 type_declarator asm_or_symbolrename_opt { 1182 cgram_declare($1, false, $2); 1183 check_size($1); 1184 } 1185 | type_declarator asm_or_symbolrename_opt { 1186 begin_initialization($1); 1187 cgram_declare($1, true, $2); 1188 } T_ASSIGN initializer { 1189 check_size($1); 1190 end_initialization(); 1191 } 1192 ; 1193 1194 notype_declarator: 1195 notype_direct_declarator 1196 | pointer notype_direct_declarator { 1197 $$ = add_pointer($2, $1); 1198 } 1199 ; 1200 1201 type_declarator: 1202 type_direct_declarator 1203 | pointer type_direct_declarator { 1204 $$ = add_pointer($2, $1); 1205 } 1206 ; 1207 1208 notype_direct_declarator: 1209 T_NAME { 1210 $$ = declarator_name(getsym($1)); 1211 } 1212 | T_LPAREN type_declarator T_RPAREN { 1213 $$ = $2; 1214 } 1215 | type_attribute notype_direct_declarator { 1216 $$ = $2; 1217 } 1218 | notype_direct_declarator T_LBRACK T_RBRACK { 1219 $$ = add_array($1, false, 0); 1220 } 1221 | notype_direct_declarator T_LBRACK array_size T_RBRACK { 1222 $$ = add_array($1, true, to_int_constant($3, false)); 1223 } 1224 | notype_direct_declarator param_list asm_or_symbolrename_opt { 1225 $$ = add_function(symbolrename($1, $3), $2); 1226 end_declaration_level(); 1227 block_level--; 1228 } 1229 | notype_direct_declarator type_attribute 1230 ; 1231 1232 type_direct_declarator: 1233 identifier { 1234 $$ = declarator_name(getsym($1)); 1235 } 1236 | T_LPAREN type_declarator T_RPAREN { 1237 $$ = $2; 1238 } 1239 | type_attribute type_direct_declarator { 1240 $$ = $2; 1241 } 1242 | type_direct_declarator T_LBRACK T_RBRACK { 1243 $$ = add_array($1, false, 0); 1244 } 1245 | type_direct_declarator T_LBRACK array_size T_RBRACK { 1246 $$ = add_array($1, true, to_int_constant($3, false)); 1247 } 1248 | type_direct_declarator param_list asm_or_symbolrename_opt { 1249 $$ = add_function(symbolrename($1, $3), $2); 1250 end_declaration_level(); 1251 block_level--; 1252 } 1253 | type_direct_declarator type_attribute 1254 ; 1255 1256 /* 1257 * The two distinct rules type_param_declarator and notype_param_declarator 1258 * avoid a conflict in argument lists. A typename enclosed in parentheses is 1259 * always treated as a typename, not an argument name. For example, after 1260 * "typedef double a;", the declaration "f(int (a));" is interpreted as 1261 * "f(int (double));", not "f(int a);". 1262 */ 1263 type_param_declarator: 1264 direct_param_declarator 1265 | pointer direct_param_declarator { 1266 $$ = add_pointer($2, $1); 1267 } 1268 ; 1269 1270 notype_param_declarator: 1271 direct_notype_param_declarator 1272 | pointer direct_notype_param_declarator { 1273 $$ = add_pointer($2, $1); 1274 } 1275 ; 1276 1277 direct_param_declarator: 1278 identifier type_attribute_list { 1279 $$ = declarator_name(getsym($1)); 1280 } 1281 | identifier { 1282 $$ = declarator_name(getsym($1)); 1283 } 1284 | T_LPAREN notype_param_declarator T_RPAREN { 1285 $$ = $2; 1286 } 1287 | direct_param_declarator T_LBRACK T_RBRACK { 1288 $$ = add_array($1, false, 0); 1289 } 1290 | direct_param_declarator T_LBRACK array_size T_RBRACK { 1291 $$ = add_array($1, true, to_int_constant($3, false)); 1292 } 1293 | direct_param_declarator param_list asm_or_symbolrename_opt { 1294 $$ = add_function(symbolrename($1, $3), $2); 1295 end_declaration_level(); 1296 block_level--; 1297 } 1298 ; 1299 1300 direct_notype_param_declarator: 1301 identifier { 1302 $$ = declarator_name(getsym($1)); 1303 } 1304 | T_LPAREN notype_param_declarator T_RPAREN { 1305 $$ = $2; 1306 } 1307 | direct_notype_param_declarator T_LBRACK T_RBRACK { 1308 $$ = add_array($1, false, 0); 1309 } 1310 | direct_notype_param_declarator T_LBRACK array_size T_RBRACK { 1311 $$ = add_array($1, true, to_int_constant($3, false)); 1312 } 1313 | direct_notype_param_declarator param_list asm_or_symbolrename_opt { 1314 $$ = add_function(symbolrename($1, $3), $2); 1315 end_declaration_level(); 1316 block_level--; 1317 } 1318 ; 1319 1320 param_list: 1321 id_list_lparen identifier_list T_RPAREN { 1322 $$ = $2; 1323 } 1324 | abstract_decl_param_list 1325 ; 1326 1327 id_list_lparen: 1328 T_LPAREN { 1329 block_level++; 1330 begin_declaration_level(PROTO_ARG); 1331 } 1332 ; 1333 1334 array_size: 1335 type_qualifier_list_opt T_SCLASS constant_expr { 1336 /* C11 6.7.6.3p7 */ 1337 if ($2 != STATIC) 1338 yyerror("Bad attribute"); 1339 /* static array size is a C11 extension */ 1340 c11ism(343); 1341 $$ = $3; 1342 } 1343 | constant_expr 1344 ; 1345 1346 identifier_list: /* C99 6.7.5 */ 1347 T_NAME { 1348 $$ = old_style_function_name(getsym($1)); 1349 } 1350 | identifier_list T_COMMA T_NAME { 1351 $$ = lnklst($1, old_style_function_name(getsym($3))); 1352 } 1353 | identifier_list error 1354 ; 1355 1356 /* XXX: C99 requires an additional specifier-qualifier-list. */ 1357 type_name: /* C99 6.7.6 */ 1358 { 1359 begin_declaration_level(ABSTRACT); 1360 } abstract_declaration { 1361 end_declaration_level(); 1362 $$ = $2->s_type; 1363 } 1364 ; 1365 1366 abstract_declaration: /* specific to lint */ 1367 begin_type_qualifier_list end_type { 1368 $$ = declare_1_abstract(abstract_name()); 1369 } 1370 | begin_type_specifier_qualifier_list end_type { 1371 $$ = declare_1_abstract(abstract_name()); 1372 } 1373 | begin_type_qualifier_list end_type abstract_declarator { 1374 $$ = declare_1_abstract($3); 1375 } 1376 | begin_type_specifier_qualifier_list end_type abstract_declarator { 1377 $$ = declare_1_abstract($3); 1378 } 1379 ; 1380 1381 /* K&R 8.7, C90 ???, C99 6.7.6, C11 6.7.7 */ 1382 /* In K&R, abstract-declarator could be empty and was still simpler. */ 1383 abstract_declarator: 1384 pointer { 1385 $$ = add_pointer(abstract_name(), $1); 1386 } 1387 | direct_abstract_declarator 1388 | pointer direct_abstract_declarator { 1389 $$ = add_pointer($2, $1); 1390 } 1391 ; 1392 1393 /* K&R ---, C90 ???, C99 6.7.6, C11 6.7.7 */ 1394 direct_abstract_declarator: 1395 T_LPAREN abstract_declarator T_RPAREN { 1396 $$ = $2; 1397 } 1398 | T_LBRACK T_RBRACK { 1399 $$ = add_array(abstract_name(), false, 0); 1400 } 1401 | T_LBRACK array_size T_RBRACK { 1402 $$ = add_array(abstract_name(), true, 1403 to_int_constant($2, false)); 1404 } 1405 | type_attribute direct_abstract_declarator { 1406 $$ = $2; 1407 } 1408 | direct_abstract_declarator T_LBRACK T_RBRACK { 1409 $$ = add_array($1, false, 0); 1410 } 1411 | direct_abstract_declarator T_LBRACK T_ASTERISK T_RBRACK { /* C99 */ 1412 $$ = add_array($1, false, 0); 1413 } 1414 | direct_abstract_declarator T_LBRACK array_size T_RBRACK { 1415 $$ = add_array($1, true, to_int_constant($3, false)); 1416 } 1417 | abstract_decl_param_list asm_or_symbolrename_opt { 1418 $$ = add_function(symbolrename(abstract_name(), $2), $1); 1419 end_declaration_level(); 1420 block_level--; 1421 } 1422 | direct_abstract_declarator abstract_decl_param_list 1423 asm_or_symbolrename_opt { 1424 $$ = add_function(symbolrename($1, $3), $2); 1425 end_declaration_level(); 1426 block_level--; 1427 } 1428 | direct_abstract_declarator type_attribute_list 1429 ; 1430 1431 abstract_decl_param_list: /* specific to lint */ 1432 abstract_decl_lparen T_RPAREN type_attribute_opt { 1433 $$ = NULL; 1434 } 1435 | abstract_decl_lparen vararg_parameter_type_list T_RPAREN 1436 type_attribute_opt { 1437 dcs->d_proto = true; 1438 $$ = $2; 1439 } 1440 | abstract_decl_lparen error T_RPAREN type_attribute_opt { 1441 $$ = NULL; 1442 } 1443 ; 1444 1445 abstract_decl_lparen: /* specific to lint */ 1446 T_LPAREN { 1447 block_level++; 1448 begin_declaration_level(PROTO_ARG); 1449 } 1450 ; 1451 1452 vararg_parameter_type_list: /* specific to lint */ 1453 parameter_type_list 1454 | parameter_type_list T_COMMA T_ELLIPSIS { 1455 dcs->d_vararg = true; 1456 $$ = $1; 1457 } 1458 | T_ELLIPSIS { 1459 if (sflag) { 1460 /* ANSI C requires formal parameter before '...' */ 1461 error(84); 1462 } else if (!tflag) { 1463 /* ANSI C requires formal parameter before '...' */ 1464 warning(84); 1465 } 1466 dcs->d_vararg = true; 1467 $$ = NULL; 1468 } 1469 ; 1470 1471 /* XXX: C99 6.7.5 defines the same name, but it looks different. */ 1472 parameter_type_list: 1473 parameter_declaration 1474 | parameter_type_list T_COMMA parameter_declaration { 1475 $$ = lnklst($1, $3); 1476 } 1477 ; 1478 1479 /* XXX: C99 6.7.5 defines the same name, but it looks completely different. */ 1480 parameter_declaration: 1481 begin_type_declmods end_type { 1482 /* ^^ There is no check for the missing type-specifier. */ 1483 $$ = declare_argument(abstract_name(), false); 1484 } 1485 | begin_type_declaration_specifiers end_type { 1486 $$ = declare_argument(abstract_name(), false); 1487 } 1488 | begin_type_declmods end_type notype_param_declarator { 1489 /* ^^ There is no check for the missing type-specifier. */ 1490 $$ = declare_argument($3, false); 1491 } 1492 /* 1493 * type_param_declarator is needed because of following conflict: 1494 * "typedef int a; f(int (a));" could be parsed as 1495 * "function with argument a of type int", or 1496 * "function with an abstract argument of type function". 1497 * This grammar realizes the second case. 1498 */ 1499 | begin_type_declaration_specifiers end_type type_param_declarator { 1500 $$ = declare_argument($3, false); 1501 } 1502 | begin_type_declmods end_type abstract_declarator { 1503 /* ^^ There is no check for the missing type-specifier. */ 1504 $$ = declare_argument($3, false); 1505 } 1506 | begin_type_declaration_specifiers end_type abstract_declarator { 1507 $$ = declare_argument($3, false); 1508 } 1509 ; 1510 1511 initializer: /* C99 6.7.8 "Initialization" */ 1512 assignment_expression { 1513 init_expr($1); 1514 } 1515 | init_lbrace init_rbrace { 1516 /* XXX: Empty braces are not covered by C99 6.7.8. */ 1517 } 1518 | init_lbrace initializer_list comma_opt init_rbrace 1519 /* XXX: What is this error handling for? */ 1520 | error 1521 ; 1522 1523 initializer_list: /* C99 6.7.8 "Initialization" */ 1524 initializer_list_item 1525 | initializer_list T_COMMA initializer_list_item 1526 ; 1527 1528 initializer_list_item: /* helper */ 1529 designation initializer 1530 | initializer 1531 ; 1532 1533 designation: /* C99 6.7.8 "Initialization" */ 1534 designator_list T_ASSIGN 1535 | identifier T_COLON { 1536 /* GCC style struct or union member name in initializer */ 1537 gnuism(315); 1538 add_designator_member($1); 1539 } 1540 ; 1541 1542 designator_list: /* C99 6.7.8 "Initialization" */ 1543 designator 1544 | designator_list designator 1545 ; 1546 1547 designator: /* C99 6.7.8 "Initialization" */ 1548 T_LBRACK range T_RBRACK { 1549 add_designator_subscript($2); 1550 if (!Sflag) 1551 /* array initializer with des.s is a C9X feature */ 1552 warning(321); 1553 } 1554 | T_POINT identifier { 1555 if (!Sflag) 1556 /* struct or union member name in initializer is ... */ 1557 warning(313); 1558 add_designator_member($2); 1559 } 1560 ; 1561 1562 range: 1563 constant_expr { 1564 $$.lo = to_int_constant($1, true); 1565 $$.hi = $$.lo; 1566 } 1567 | constant_expr T_ELLIPSIS constant_expr { 1568 $$.lo = to_int_constant($1, true); 1569 $$.hi = to_int_constant($3, true); 1570 /* initialization with '[a...b]' is a GCC extension */ 1571 gnuism(340); 1572 } 1573 ; 1574 1575 init_lbrace: /* helper */ 1576 T_LBRACE { 1577 init_lbrace(); 1578 } 1579 ; 1580 1581 init_rbrace: /* helper */ 1582 T_RBRACE { 1583 init_rbrace(); 1584 } 1585 ; 1586 1587 asm_or_symbolrename_opt: /* GCC extensions */ 1588 /* empty */ { 1589 $$ = NULL; 1590 } 1591 | T_ASM T_LPAREN T_STRING T_RPAREN gcc_attribute_list_opt { 1592 freeyyv(&$3, T_STRING); 1593 $$ = NULL; 1594 } 1595 | T_SYMBOLRENAME T_LPAREN T_NAME T_RPAREN gcc_attribute_list_opt { 1596 $$ = $3; 1597 } 1598 ; 1599 1600 statement: /* C99 6.8 */ 1601 expression_statement 1602 | non_expr_statement 1603 ; 1604 1605 non_expr_statement: /* helper for C99 6.8 */ 1606 type_attribute T_SEMI 1607 | labeled_statement 1608 | compound_statement 1609 | selection_statement 1610 | iteration_statement 1611 | jump_statement { 1612 seen_fallthrough = false; 1613 } 1614 | asm_statement 1615 ; 1616 1617 labeled_statement: /* C99 6.8.1 */ 1618 label type_attribute_opt statement 1619 ; 1620 1621 label: 1622 T_NAME T_COLON { 1623 symtyp = FLABEL; 1624 named_label(getsym($1)); 1625 } 1626 | T_CASE constant_expr T_COLON { 1627 case_label($2); 1628 seen_fallthrough = true; 1629 } 1630 | T_CASE constant_expr T_ELLIPSIS constant_expr T_COLON { 1631 /* XXX: We don't fill all cases */ 1632 case_label($2); 1633 seen_fallthrough = true; 1634 } 1635 | T_DEFAULT T_COLON { 1636 default_label(); 1637 seen_fallthrough = true; 1638 } 1639 ; 1640 1641 compound_statement: /* C99 6.8.2 */ 1642 compound_statement_lbrace compound_statement_rbrace 1643 | compound_statement_lbrace block_item_list compound_statement_rbrace 1644 ; 1645 1646 compound_statement_lbrace: 1647 T_LBRACE { 1648 block_level++; 1649 mem_block_level++; 1650 begin_declaration_level(AUTO); 1651 } 1652 ; 1653 1654 compound_statement_rbrace: 1655 T_RBRACE { 1656 end_declaration_level(); 1657 freeblk(); 1658 mem_block_level--; 1659 block_level--; 1660 seen_fallthrough = false; 1661 } 1662 ; 1663 1664 block_item_list: /* C99 6.8.2 */ 1665 block_item 1666 | block_item_list block_item { 1667 if (!Sflag && $1 && !$2) 1668 /* declarations after statements is a C99 feature */ 1669 c99ism(327); 1670 $$ = $1 || $2; 1671 } 1672 ; 1673 1674 block_item: /* C99 6.8.2 */ 1675 declaration_or_error { 1676 $$ = false; 1677 restore_warning_flags(); 1678 } 1679 | statement { 1680 $$ = true; 1681 restore_warning_flags(); 1682 } 1683 ; 1684 1685 expression_statement: /* C99 6.8.3 */ 1686 expression T_SEMI { 1687 expr($1, false, false, false, false); 1688 seen_fallthrough = false; 1689 } 1690 | T_SEMI { 1691 seen_fallthrough = false; 1692 } 1693 ; 1694 1695 selection_statement: /* C99 6.8.4 */ 1696 if_without_else %prec T_THEN { 1697 save_warning_flags(); 1698 if2(); 1699 if3(false); 1700 } 1701 | if_without_else T_ELSE { 1702 save_warning_flags(); 1703 if2(); 1704 } statement { 1705 clear_warning_flags(); 1706 if3(true); 1707 } 1708 | if_without_else T_ELSE error { 1709 clear_warning_flags(); 1710 if3(false); 1711 } 1712 | switch_expr statement { 1713 clear_warning_flags(); 1714 switch2(); 1715 } 1716 | switch_expr error { 1717 clear_warning_flags(); 1718 switch2(); 1719 } 1720 ; 1721 1722 if_without_else: /* see C99 6.8.4 */ 1723 if_expr statement 1724 | if_expr error 1725 ; 1726 1727 if_expr: /* see C99 6.8.4 */ 1728 T_IF T_LPAREN expression T_RPAREN { 1729 if1($3); 1730 clear_warning_flags(); 1731 } 1732 ; 1733 1734 switch_expr: /* see C99 6.8.4 */ 1735 T_SWITCH T_LPAREN expression T_RPAREN { 1736 switch1($3); 1737 clear_warning_flags(); 1738 } 1739 ; 1740 1741 iteration_statement: /* C99 6.8.5 */ 1742 while_expr statement { 1743 clear_warning_flags(); 1744 while2(); 1745 } 1746 | while_expr error { 1747 clear_warning_flags(); 1748 while2(); 1749 } 1750 | do_statement do_while_expr { 1751 do2($2); 1752 seen_fallthrough = false; 1753 } 1754 | do error { 1755 clear_warning_flags(); 1756 do2(NULL); 1757 } 1758 | for_exprs statement { 1759 clear_warning_flags(); 1760 for2(); 1761 end_declaration_level(); 1762 block_level--; 1763 } 1764 | for_exprs error { 1765 clear_warning_flags(); 1766 for2(); 1767 end_declaration_level(); 1768 block_level--; 1769 } 1770 ; 1771 1772 while_expr: /* see C99 6.8.5 */ 1773 T_WHILE T_LPAREN expression T_RPAREN { 1774 while1($3); 1775 clear_warning_flags(); 1776 } 1777 ; 1778 1779 do_statement: /* see C99 6.8.5 */ 1780 do statement { 1781 clear_warning_flags(); 1782 } 1783 ; 1784 1785 do: /* see C99 6.8.5 */ 1786 T_DO { 1787 do1(); 1788 } 1789 ; 1790 1791 do_while_expr: /* see C99 6.8.5 */ 1792 T_WHILE T_LPAREN expression T_RPAREN T_SEMI { 1793 $$ = $3; 1794 } 1795 ; 1796 1797 for_start: /* see C99 6.8.5 */ 1798 T_FOR T_LPAREN { 1799 begin_declaration_level(AUTO); 1800 block_level++; 1801 } 1802 ; 1803 1804 for_exprs: /* see C99 6.8.5 */ 1805 for_start 1806 begin_type_declaration_specifiers end_type 1807 notype_init_declarators T_SEMI 1808 expression_opt T_SEMI expression_opt T_RPAREN { 1809 /* variable declaration in for loop */ 1810 c99ism(325); 1811 for1(NULL, $6, $8); 1812 clear_warning_flags(); 1813 } 1814 | for_start 1815 expression_opt T_SEMI 1816 expression_opt T_SEMI 1817 expression_opt T_RPAREN { 1818 for1($2, $4, $6); 1819 clear_warning_flags(); 1820 } 1821 ; 1822 1823 jump_statement: /* C99 6.8.6 */ 1824 goto identifier T_SEMI { 1825 do_goto(getsym($2)); 1826 } 1827 | goto error T_SEMI { 1828 symtyp = FVFT; 1829 } 1830 | T_CONTINUE T_SEMI { 1831 do_continue(); 1832 } 1833 | T_BREAK T_SEMI { 1834 do_break(); 1835 } 1836 | T_RETURN T_SEMI { 1837 do_return(NULL); 1838 } 1839 | T_RETURN expression T_SEMI { 1840 do_return($2); 1841 } 1842 ; 1843 1844 goto: /* see C99 6.8.6 */ 1845 T_GOTO { 1846 symtyp = FLABEL; 1847 } 1848 ; 1849 1850 asm_statement: /* GCC extension */ 1851 T_ASM T_LPAREN read_until_rparen T_SEMI { 1852 setasm(); 1853 } 1854 | T_ASM T_QUAL T_LPAREN read_until_rparen T_SEMI { 1855 setasm(); 1856 } 1857 | T_ASM error 1858 ; 1859 1860 read_until_rparen: /* helper for 'asm_statement' */ 1861 /* empty */ { 1862 read_until_rparen(); 1863 } 1864 ; 1865 1866 translation_unit: /* C99 6.9 */ 1867 external_declaration 1868 | translation_unit external_declaration 1869 ; 1870 1871 external_declaration: /* C99 6.9 */ 1872 function_definition { 1873 global_clean_up_decl(false); 1874 clear_warning_flags(); 1875 } 1876 | top_level_declaration { 1877 global_clean_up_decl(false); 1878 clear_warning_flags(); 1879 } 1880 | asm_statement /* GCC extension */ 1881 | T_SEMI { /* GCC extension */ 1882 if (sflag) { 1883 /* empty declaration */ 1884 error(0); 1885 } else if (!tflag) { 1886 /* empty declaration */ 1887 warning(0); 1888 } 1889 } 1890 ; 1891 1892 /* 1893 * On the top level, lint allows several forms of declarations that it doesn't 1894 * allow in functions. For example, a single ';' is an empty declaration and 1895 * is supported by some compilers, but in a function it would be an empty 1896 * statement, not a declaration. This makes a difference in C90 mode, where 1897 * a statement must not be followed by a declaration. 1898 * 1899 * See 'declaration' for all other declarations. 1900 */ 1901 top_level_declaration: /* C99 6.9 calls this 'declaration' */ 1902 begin_type end_type notype_init_declarators T_SEMI { 1903 if (sflag) { 1904 /* old style declaration; add 'int' */ 1905 error(1); 1906 } else if (!tflag) { 1907 /* old style declaration; add 'int' */ 1908 warning(1); 1909 } 1910 } 1911 | declaration 1912 | error T_SEMI { 1913 global_clean_up(); 1914 } 1915 | error T_RBRACE { 1916 global_clean_up(); 1917 } 1918 ; 1919 1920 function_definition: /* C99 6.9.1 */ 1921 func_declarator { 1922 if ($1->s_type->t_tspec != FUNC) { 1923 /* syntax error '%s' */ 1924 error(249, yytext); 1925 YYERROR; 1926 } 1927 if ($1->s_type->t_typedef) { 1928 /* ()-less function definition */ 1929 error(64); 1930 YYERROR; 1931 } 1932 funcdef($1); 1933 block_level++; 1934 begin_declaration_level(ARG); 1935 if (lwarn == LWARN_NONE) 1936 $1->s_used = true; 1937 } arg_declaration_list_opt { 1938 end_declaration_level(); 1939 block_level--; 1940 check_func_lint_directives(); 1941 check_func_old_style_arguments(); 1942 begin_control_statement(CS_FUNCTION_BODY); 1943 } compound_statement { 1944 funcend(); 1945 end_control_statement(CS_FUNCTION_BODY); 1946 } 1947 ; 1948 1949 func_declarator: 1950 begin_type end_type notype_declarator { 1951 /* ^^ There is no check for the missing type-specifier. */ 1952 $$ = $3; 1953 } 1954 | begin_type_declmods end_type notype_declarator { 1955 /* ^^ There is no check for the missing type-specifier. */ 1956 $$ = $3; 1957 } 1958 | begin_type_declaration_specifiers end_type type_declarator { 1959 $$ = $3; 1960 } 1961 ; 1962 1963 arg_declaration_list_opt: /* C99 6.9.1p13 example 1 */ 1964 /* empty */ 1965 | arg_declaration_list 1966 ; 1967 1968 arg_declaration_list: /* C99 6.9.1p13 example 1 */ 1969 arg_declaration 1970 | arg_declaration_list arg_declaration 1971 /* XXX or better "arg_declaration error" ? */ 1972 | error 1973 ; 1974 1975 /* 1976 * "arg_declaration" is separated from "declaration" because it 1977 * needs other error handling. 1978 */ 1979 arg_declaration: 1980 begin_type_declmods end_type T_SEMI { 1981 /* empty declaration */ 1982 warning(2); 1983 } 1984 | begin_type_declmods end_type notype_init_declarators T_SEMI 1985 | begin_type_declaration_specifiers end_type T_SEMI { 1986 if (!dcs->d_nonempty_decl) { 1987 /* empty declaration */ 1988 warning(2); 1989 } else { 1990 /* '%s' declared in argument declaration list */ 1991 warning(3, type_name(dcs->d_type)); 1992 } 1993 } 1994 | begin_type_declaration_specifiers end_type 1995 type_init_declarators T_SEMI { 1996 if (dcs->d_nonempty_decl) { 1997 /* '%s' declared in argument declaration list */ 1998 warning(3, type_name(dcs->d_type)); 1999 } 2000 } 2001 | begin_type_declmods error 2002 | begin_type_declaration_specifiers error 2003 ; 2004 2005 gcc_attribute_list_opt: 2006 /* empty */ 2007 | gcc_attribute_list 2008 ; 2009 2010 gcc_attribute_list: 2011 gcc_attribute 2012 | gcc_attribute_list gcc_attribute 2013 ; 2014 2015 gcc_attribute: 2016 T_ATTRIBUTE T_LPAREN T_LPAREN { 2017 attron = true; 2018 } gcc_attribute_spec_list { 2019 attron = false; 2020 } T_RPAREN T_RPAREN 2021 ; 2022 2023 gcc_attribute_spec_list: 2024 gcc_attribute_spec 2025 | gcc_attribute_spec_list T_COMMA gcc_attribute_spec 2026 ; 2027 2028 gcc_attribute_spec: 2029 /* empty */ 2030 | T_AT_ALWAYS_INLINE 2031 | T_AT_ALIAS T_LPAREN string T_RPAREN 2032 | T_AT_ALIGNED T_LPAREN constant_expr T_RPAREN 2033 | T_AT_ALIGNED 2034 | T_AT_ALLOC_SIZE T_LPAREN constant_expr T_COMMA constant_expr T_RPAREN 2035 | T_AT_ALLOC_SIZE T_LPAREN constant_expr T_RPAREN 2036 | T_AT_BOUNDED T_LPAREN gcc_attribute_bounded 2037 T_COMMA constant_expr T_COMMA constant_expr T_RPAREN 2038 | T_AT_COLD 2039 | T_AT_COMMON 2040 | T_AT_CONSTRUCTOR T_LPAREN constant_expr T_RPAREN 2041 | T_AT_CONSTRUCTOR 2042 | T_AT_DEPRECATED T_LPAREN string T_RPAREN 2043 | T_AT_DEPRECATED 2044 | T_AT_DESTRUCTOR T_LPAREN constant_expr T_RPAREN 2045 | T_AT_DESTRUCTOR 2046 | T_AT_FALLTHROUGH { 2047 fallthru(1); 2048 } 2049 | T_AT_FORMAT T_LPAREN gcc_attribute_format T_COMMA 2050 constant_expr T_COMMA constant_expr T_RPAREN 2051 | T_AT_FORMAT_ARG T_LPAREN constant_expr T_RPAREN 2052 | T_AT_GNU_INLINE 2053 | T_AT_HOT 2054 | T_AT_MALLOC 2055 | T_AT_MAY_ALIAS 2056 | T_AT_MODE T_LPAREN T_NAME T_RPAREN 2057 | T_AT_NOINLINE 2058 | T_AT_NONNULL T_LPAREN constant_expr_list_opt T_RPAREN 2059 | T_AT_NONNULL 2060 | T_AT_NONSTRING 2061 | T_AT_NORETURN 2062 | T_AT_NOTHROW 2063 | T_AT_NO_INSTRUMENT_FUNCTION 2064 | T_AT_OPTIMIZE T_LPAREN string T_RPAREN 2065 | T_AT_PACKED { 2066 addpacked(); 2067 } 2068 | T_AT_PCS T_LPAREN string T_RPAREN 2069 | T_AT_PURE 2070 | T_AT_RETURNS_TWICE 2071 | T_AT_SECTION T_LPAREN string T_RPAREN 2072 | T_AT_SENTINEL T_LPAREN constant_expr T_RPAREN 2073 | T_AT_SENTINEL 2074 | T_AT_TLS_MODEL T_LPAREN string T_RPAREN 2075 | T_AT_TUNION 2076 | T_AT_UNUSED { 2077 add_attr_used(); 2078 } 2079 | T_AT_USED { 2080 add_attr_used(); 2081 } 2082 | T_AT_VISIBILITY T_LPAREN constant_expr T_RPAREN 2083 | T_AT_WARN_UNUSED_RESULT 2084 | T_AT_WEAK 2085 | T_QUAL { 2086 if ($1 != CONST) 2087 yyerror("Bad attribute"); 2088 } 2089 ; 2090 2091 gcc_attribute_bounded: 2092 T_AT_MINBYTES 2093 | T_AT_STRING 2094 | T_AT_BUFFER 2095 ; 2096 2097 gcc_attribute_format: 2098 T_AT_FORMAT_GNU_PRINTF 2099 | T_AT_FORMAT_PRINTF 2100 | T_AT_FORMAT_SCANF 2101 | T_AT_FORMAT_STRFMON 2102 | T_AT_FORMAT_STRFTIME 2103 | T_AT_FORMAT_SYSLOG 2104 ; 2105 2106 %% 2107 2108 /* ARGSUSED */ 2109 int 2110 yyerror(const char *msg) 2111 { 2112 /* syntax error '%s' */ 2113 error(249, yytext); 2114 if (++sytxerr >= 5) 2115 norecover(); 2116 return 0; 2117 } 2118 2119 static void 2120 cgram_declare(sym_t *decl, bool initflg, sbuf_t *renaming) 2121 { 2122 declare(decl, initflg, renaming); 2123 if (renaming != NULL) 2124 freeyyv(&renaming, T_NAME); 2125 } 2126 2127 /* 2128 * Discard all input tokens up to and including the next 2129 * unmatched right paren 2130 */ 2131 static void 2132 read_until_rparen(void) 2133 { 2134 int level; 2135 2136 if (yychar < 0) 2137 yychar = yylex(); 2138 freeyyv(&yylval, yychar); 2139 2140 level = 1; 2141 while (yychar != T_RPAREN || --level > 0) { 2142 if (yychar == T_LPAREN) { 2143 level++; 2144 } else if (yychar <= 0) { 2145 break; 2146 } 2147 freeyyv(&yylval, yychar = yylex()); 2148 } 2149 2150 yyclearin; 2151 } 2152 2153 static sym_t * 2154 symbolrename(sym_t *s, sbuf_t *sb) 2155 { 2156 if (sb != NULL) 2157 s->s_rename = sb->sb_name; 2158 return s; 2159 } 2160
Indexes created Fri Oct 03 02:09:57 GMT 2025