cgram.y revision 1.329
1 %{ 2 /* $NetBSD: cgram.y,v 1.329 2021/07/20 19:35:53 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 1.329 2021/07/20 19:35:53 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 ignore_up_to_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 165 128 129 %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 $$ = getsym($1); 372 } 373 ; 374 375 /* K&R ???, C90 ???, C99 6.4.2.1, C11 ??? */ 376 identifier: 377 T_NAME { 378 $$ = $1; 379 cgram_debug("name '%s'", $$->sb_name); 380 } 381 | T_TYPENAME { 382 $$ = $1; 383 cgram_debug("typename '%s'", $$->sb_name); 384 } 385 ; 386 387 /* see C99 6.4.5, string literals are joined by 5.1.1.2 */ 388 string: 389 T_STRING 390 | T_STRING string2 { 391 $$ = 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 $$ = new_name_node(getsym($1), yychar); 416 } 417 | T_CON { 418 $$ = expr_new_constant(gettyp($1->v_tspec), $1); 419 } 420 | string { 421 $$ = new_string_node($1); 422 } 423 | T_LPAREN expression T_RPAREN { 424 if ($2 != NULL) 425 $2->tn_parenthesized = true; 426 $$ = $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 $$ = new_function_call_node($1, NULL); 477 } 478 | postfix_expression T_LPAREN argument_expression_list T_RPAREN { 479 $$ = new_function_call_node($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 $$ = new_name_node(*current_initsym(), 0); 496 end_initialization(); 497 } 498 | T_LPAREN compound_statement_lbrace gcc_statement_expr_list { 499 block_level--; 500 mem_block_level--; 501 begin_initialization(mktempsym(dup_type($3->tn_type))); 502 mem_block_level++; 503 block_level++; 504 /* ({ }) is a GCC extension */ 505 gnuism(320); 506 } compound_statement_rbrace T_RPAREN { 507 $$ = new_name_node(*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 $$ = $1; 547 expr($1, false, false, false, false); 548 seen_fallthrough = false; 549 } 550 } 551 ; 552 553 point_or_arrow: /* helper for 'postfix_expression' */ 554 T_POINT { 555 symtyp = FMEMBER; 556 $$ = POINT; 557 } 558 | T_ARROW { 559 symtyp = FMEMBER; 560 $$ = ARROW; 561 } 562 ; 563 564 /* K&R 7.1, C90 ???, C99 6.5.2, C11 6.5.2 */ 565 argument_expression_list: 566 assignment_expression { 567 $$ = new_function_argument_node(NULL, $1); 568 } 569 | argument_expression_list T_COMMA assignment_expression { 570 $$ = new_function_argument_node($1, $3); 571 } 572 ; 573 574 /* K&R 7.2, C90 ???, C99 6.5.3, C11 6.5.3 */ 575 unary_expression: 576 postfix_expression 577 | T_INCDEC unary_expression { 578 $$ = 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, false, false, false, false, false, true); 612 } 613 | T_SIZEOF T_LPAREN type_name T_RPAREN { 614 $$ = build_sizeof($3); 615 } 616 /* K&R ---, C90 ---, C99 ---, C11 6.5.3 */ 617 | T_ALIGNOF T_LPAREN type_name T_RPAREN { 618 $$ = 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 conditional_expression T_ASTERISK conditional_expression { 652 $$ = build_binary($1, MULT, $3); 653 } 654 | conditional_expression T_MULTIPLICATIVE conditional_expression { 655 $$ = build_binary($1, $2, $3); 656 } 657 | conditional_expression T_ADDITIVE conditional_expression { 658 $$ = build_binary($1, $2, $3); 659 } 660 | conditional_expression T_SHIFT conditional_expression { 661 $$ = build_binary($1, $2, $3); 662 } 663 | conditional_expression T_RELATIONAL conditional_expression { 664 $$ = build_binary($1, $2, $3); 665 } 666 | conditional_expression T_EQUALITY conditional_expression { 667 $$ = build_binary($1, $2, $3); 668 } 669 | conditional_expression T_AMPER conditional_expression { 670 $$ = build_binary($1, BITAND, $3); 671 } 672 | conditional_expression T_BITXOR conditional_expression { 673 $$ = build_binary($1, BITXOR, $3); 674 } 675 | conditional_expression T_BITOR conditional_expression { 676 $$ = build_binary($1, BITOR, $3); 677 } 678 | conditional_expression T_LOGAND conditional_expression { 679 $$ = build_binary($1, LOGAND, $3); 680 } 681 | conditional_expression T_LOGOR conditional_expression { 682 $$ = build_binary($1, LOGOR, $3); 683 } 684 | conditional_expression T_QUEST conditional_expression 685 T_COLON conditional_expression { 686 $$ = build_binary($1, QUEST, build_binary($3, COLON, $5)); 687 } 688 | cast_expression; 689 690 /* K&R ???, C90 ???, C99 6.5.16, C11 6.5.16 */ 691 assignment_expression: 692 conditional_expression 693 | assignment_expression T_ASSIGN conditional_expression { 694 $$ = build_binary($1, ASSIGN, $3); 695 } 696 | assignment_expression T_OPASSIGN conditional_expression { 697 $$ = build_binary($1, $2, $3); 698 } 699 ; 700 701 /* K&R ???, C90 ???, C99 6.5.17, C11 6.5.17 */ 702 expression: 703 assignment_expression 704 | expression T_COMMA assignment_expression { 705 $$ = build_binary($1, COMMA, $3); 706 } 707 ; 708 709 constant_expr_list_opt: /* helper for gcc_attribute */ 710 /* empty */ 711 | constant_expr_list 712 ; 713 714 constant_expr_list: /* helper for gcc_attribute */ 715 constant_expr 716 | constant_expr_list T_COMMA constant_expr 717 ; 718 719 constant_expr: /* C99 6.6 */ 720 conditional_expression 721 ; 722 723 declaration_or_error: 724 declaration 725 | error T_SEMI 726 ; 727 728 declaration: /* C99 6.7 */ 729 begin_type_declmods end_type T_SEMI { 730 if (dcs->d_scl == TYPEDEF) { 731 /* typedef declares no type name */ 732 warning(72); 733 } else { 734 /* empty declaration */ 735 warning(2); 736 } 737 } 738 | begin_type_declmods end_type notype_init_declarators T_SEMI 739 | begin_type_declaration_specifiers end_type T_SEMI { 740 if (dcs->d_scl == TYPEDEF) { 741 /* typedef declares no type name */ 742 warning(72); 743 } else if (!dcs->d_nonempty_decl) { 744 /* empty declaration */ 745 warning(2); 746 } 747 } 748 | begin_type_declaration_specifiers end_type 749 type_init_declarators T_SEMI 750 ; 751 752 begin_type_declaration_specifiers: /* see C99 6.7 */ 753 begin_type_typespec { 754 add_type($1); 755 } 756 | begin_type_declmods type_specifier { 757 add_type($2); 758 } 759 | type_attribute begin_type_declaration_specifiers 760 | begin_type_declaration_specifiers declmod 761 | begin_type_declaration_specifiers notype_type_specifier { 762 add_type($2); 763 } 764 ; 765 766 begin_type_declmods: /* see C99 6.7 */ 767 begin_type T_QUAL { 768 add_qualifier($2); 769 } 770 | begin_type T_SCLASS { 771 add_storage_class($2); 772 } 773 | begin_type_declmods declmod 774 ; 775 776 begin_type_noclass_declspecs: 777 begin_type_typespec { 778 add_type($1); 779 } 780 | type_attribute begin_type_noclass_declspecs 781 | begin_type_noclass_declmods type_specifier { 782 add_type($2); 783 } 784 | begin_type_noclass_declspecs T_QUAL { 785 add_qualifier($2); 786 } 787 | begin_type_noclass_declspecs notype_type_specifier { 788 add_type($2); 789 } 790 | begin_type_noclass_declspecs type_attribute 791 ; 792 793 begin_type_typespec: 794 begin_type notype_type_specifier { 795 $$ = $2; 796 } 797 | T_TYPENAME begin_type { 798 $$ = getsym($1)->s_type; 799 } 800 ; 801 802 begin_type_noclass_declmods: 803 begin_type T_QUAL { 804 add_qualifier($2); 805 } 806 | begin_type_noclass_declmods T_QUAL { 807 add_qualifier($2); 808 } 809 ; 810 811 declmod: 812 T_QUAL { 813 add_qualifier($1); 814 } 815 | T_SCLASS { 816 add_storage_class($1); 817 } 818 | type_attribute_list 819 ; 820 821 type_attribute_list: 822 type_attribute 823 | type_attribute_list type_attribute 824 ; 825 826 type_attribute_opt: 827 /* empty */ 828 | type_attribute 829 ; 830 831 type_attribute: /* See C11 6.7 declaration-specifiers */ 832 T_ATTRIBUTE T_LPAREN T_LPAREN { 833 attron = true; 834 } gcc_attribute_spec_list { 835 attron = false; 836 } T_RPAREN T_RPAREN 837 | T_ALIGNAS T_LPAREN align_as T_RPAREN 838 | T_PACKED { 839 addpacked(); 840 } 841 | T_NORETURN 842 ; 843 844 align_as: /* See alignment-specifier in C11 6.7.5 */ 845 type_specifier 846 | constant_expr 847 ; 848 849 begin_type: 850 /* empty */ { 851 begin_type(); 852 } 853 ; 854 855 end_type: 856 /* empty */ { 857 end_type(); 858 } 859 ; 860 861 type_specifier: /* C99 6.7.2 */ 862 notype_type_specifier 863 | T_TYPENAME { 864 $$ = getsym($1)->s_type; 865 } 866 ; 867 868 notype_type_specifier: /* see C99 6.7.2 */ 869 T_TYPE { 870 $$ = gettyp($1); 871 } 872 | T_TYPEOF cast_expression { /* GCC extension */ 873 $$ = $2->tn_type; 874 } 875 | struct_or_union_specifier { 876 end_declaration_level(); 877 $$ = $1; 878 } 879 | enum_specifier { 880 end_declaration_level(); 881 $$ = $1; 882 } 883 ; 884 885 struct_or_union_specifier: /* C99 6.7.2.1 */ 886 struct_or_union identifier_sym { 887 /* 888 * STDC requires that "struct a;" always introduces 889 * a new tag if "a" is not declared at current level 890 * 891 * yychar is valid because otherwise the parser would not 892 * have been able to decide if it must shift or reduce 893 */ 894 $$ = mktag($2, $1, false, yychar == T_SEMI); 895 } 896 | struct_or_union identifier_sym { 897 dcs->d_tagtyp = mktag($2, $1, true, false); 898 } braced_struct_declaration_list { 899 $$ = complete_tag_struct_or_union(dcs->d_tagtyp, $4); 900 } 901 | struct_or_union { 902 dcs->d_tagtyp = mktag(NULL, $1, true, false); 903 } braced_struct_declaration_list { 904 $$ = complete_tag_struct_or_union(dcs->d_tagtyp, $3); 905 } 906 | struct_or_union error { 907 symtyp = FVFT; 908 $$ = gettyp(INT); 909 } 910 ; 911 912 struct_or_union: /* C99 6.7.2.1 */ 913 struct_or_union type_attribute 914 | T_STRUCT_OR_UNION { 915 symtyp = FTAG; 916 begin_declaration_level($1 == STRUCT ? MOS : MOU); 917 dcs->d_offset = 0; 918 dcs->d_sou_align_in_bits = CHAR_SIZE; 919 $$ = $1; 920 } 921 ; 922 923 braced_struct_declaration_list: /* see C99 6.7.2.1 */ 924 struct_declaration_lbrace struct_declaration_list_with_rbrace { 925 $$ = $2; 926 } 927 ; 928 929 struct_declaration_lbrace: /* see C99 6.7.2.1 */ 930 T_LBRACE { 931 symtyp = FVFT; 932 } 933 ; 934 935 struct_declaration_list_with_rbrace: /* see C99 6.7.2.1 */ 936 struct_declaration_list T_RBRACE 937 | T_RBRACE { 938 /* XXX: This is not allowed by any C standard. */ 939 $$ = NULL; 940 } 941 ; 942 943 struct_declaration_list: /* C99 6.7.2.1 */ 944 struct_declaration 945 | struct_declaration_list struct_declaration { 946 $$ = lnklst($1, $2); 947 } 948 ; 949 950 struct_declaration: /* C99 6.7.2.1 */ 951 begin_type_noclass_declmods end_type { 952 /* too late, i know, but getsym() compensates it */ 953 symtyp = FMEMBER; 954 } notype_struct_declarators type_attribute_opt T_SEMI { 955 symtyp = FVFT; 956 $$ = $4; 957 } 958 | begin_type_noclass_declspecs end_type { 959 symtyp = FMEMBER; 960 } type_struct_declarators type_attribute_opt T_SEMI { 961 symtyp = FVFT; 962 $$ = $4; 963 } 964 | begin_type_noclass_declmods end_type type_attribute_opt T_SEMI { 965 /* syntax error '%s' */ 966 error(249, "member without type"); 967 $$ = NULL; 968 } 969 | begin_type_noclass_declspecs end_type type_attribute_opt T_SEMI { 970 symtyp = FVFT; 971 if (!Sflag) 972 /* anonymous struct/union members is a C9X feature */ 973 warning(49); 974 if (is_struct_or_union(dcs->d_type->t_tspec)) { 975 $$ = 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 $$ = bitfield(NULL, to_int_constant($3, true)); 1033 } 1034 ; 1035 1036 enum_specifier: /* C99 6.7.2.2 */ 1037 enum identifier_sym { 1038 $$ = mktag($2, ENUM, false, false); 1039 } 1040 | enum identifier_sym { 1041 dcs->d_tagtyp = mktag($2, ENUM, true, false); 1042 } enum_declaration { 1043 $$ = complete_tag_enum(dcs->d_tagtyp, $4); 1044 } 1045 | enum { 1046 dcs->d_tagtyp = mktag(NULL, ENUM, true, false); 1047 } enum_declaration { 1048 $$ = complete_tag_enum(dcs->d_tagtyp, $3); 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 $$ = NULL; 1097 } 1098 ; 1099 1100 enumerator: /* C99 6.7.2.2 */ 1101 identifier_sym { 1102 $$ = enumeration_constant($1, enumval, true); 1103 } 1104 | identifier_sym T_ASSIGN constant_expr { 1105 $$ = enumeration_constant($1, to_int_constant($3, true), false); 1106 } 1107 ; 1108 1109 type_qualifier: /* C99 6.7.3 */ 1110 T_QUAL { 1111 $$ = xcalloc(1, sizeof(*$$)); 1112 if ($1 == CONST) { 1113 $$->p_const = true; 1114 } else if ($1 == VOLATILE) { 1115 $$->p_volatile = true; 1116 } else { 1117 lint_assert($1 == RESTRICT || $1 == THREAD); 1118 } 1119 } 1120 ; 1121 1122 pointer: /* C99 6.7.5 */ 1123 asterisk type_qualifier_list_opt { 1124 $$ = merge_qualified_pointer($1, $2); 1125 } 1126 | asterisk type_qualifier_list_opt pointer { 1127 $$ = merge_qualified_pointer($1, $2); 1128 $$ = merge_qualified_pointer($$, $3); 1129 } 1130 ; 1131 1132 asterisk: /* helper for 'pointer' */ 1133 T_ASTERISK { 1134 $$ = xcalloc(1, sizeof(*$$)); 1135 $$->p_pointer = true; 1136 } 1137 ; 1138 1139 type_qualifier_list_opt: /* see C99 6.7.5 */ 1140 /* empty */ { 1141 $$ = NULL; 1142 } 1143 | type_qualifier_list 1144 ; 1145 1146 type_qualifier_list: /* C99 6.7.5 */ 1147 type_qualifier 1148 | type_qualifier_list type_qualifier { 1149 $$ = merge_qualified_pointer($1, $2); 1150 } 1151 ; 1152 1153 /* 1154 * For an explanation of 'notype' in the following rules, see the Bison 1155 * manual, section 7.1 "Semantic Info in Token Kinds". 1156 */ 1157 1158 notype_init_declarators: 1159 notype_init_declarator 1160 | notype_init_declarators T_COMMA type_init_declarator 1161 ; 1162 1163 type_init_declarators: 1164 type_init_declarator 1165 | type_init_declarators T_COMMA type_init_declarator 1166 ; 1167 1168 notype_init_declarator: 1169 notype_declarator asm_or_symbolrename_opt { 1170 cgram_declare($1, false, $2); 1171 check_size($1); 1172 } 1173 | notype_declarator asm_or_symbolrename_opt { 1174 begin_initialization($1); 1175 cgram_declare($1, true, $2); 1176 } T_ASSIGN initializer { 1177 check_size($1); 1178 end_initialization(); 1179 } 1180 ; 1181 1182 type_init_declarator: 1183 type_declarator asm_or_symbolrename_opt { 1184 cgram_declare($1, false, $2); 1185 check_size($1); 1186 } 1187 | type_declarator asm_or_symbolrename_opt { 1188 begin_initialization($1); 1189 cgram_declare($1, true, $2); 1190 } T_ASSIGN initializer { 1191 check_size($1); 1192 end_initialization(); 1193 } 1194 ; 1195 1196 notype_declarator: 1197 notype_direct_declarator 1198 | pointer notype_direct_declarator { 1199 $$ = add_pointer($2, $1); 1200 } 1201 ; 1202 1203 type_declarator: 1204 type_direct_declarator 1205 | pointer type_direct_declarator { 1206 $$ = add_pointer($2, $1); 1207 } 1208 ; 1209 1210 notype_direct_declarator: 1211 T_NAME { 1212 $$ = declarator_name(getsym($1)); 1213 } 1214 | T_LPAREN type_declarator T_RPAREN { 1215 $$ = $2; 1216 } 1217 | type_attribute notype_direct_declarator { 1218 $$ = $2; 1219 } 1220 | notype_direct_declarator T_LBRACK T_RBRACK { 1221 $$ = add_array($1, false, 0); 1222 } 1223 | notype_direct_declarator T_LBRACK array_size T_RBRACK { 1224 $$ = add_array($1, true, to_int_constant($3, false)); 1225 } 1226 | notype_direct_declarator param_list asm_or_symbolrename_opt { 1227 $$ = add_function(symbolrename($1, $3), $2); 1228 end_declaration_level(); 1229 block_level--; 1230 } 1231 | notype_direct_declarator type_attribute 1232 ; 1233 1234 type_direct_declarator: 1235 identifier { 1236 $$ = declarator_name(getsym($1)); 1237 } 1238 | T_LPAREN type_declarator T_RPAREN { 1239 $$ = $2; 1240 } 1241 | type_attribute type_direct_declarator { 1242 $$ = $2; 1243 } 1244 | type_direct_declarator T_LBRACK T_RBRACK { 1245 $$ = add_array($1, false, 0); 1246 } 1247 | type_direct_declarator T_LBRACK array_size T_RBRACK { 1248 $$ = add_array($1, true, to_int_constant($3, false)); 1249 } 1250 | type_direct_declarator param_list asm_or_symbolrename_opt { 1251 $$ = add_function(symbolrename($1, $3), $2); 1252 end_declaration_level(); 1253 block_level--; 1254 } 1255 | type_direct_declarator type_attribute 1256 ; 1257 1258 /* 1259 * The two distinct rules type_param_declarator and notype_param_declarator avoid a 1260 * conflict in argument lists. A typename enclosed in parentheses is always 1261 * treated as a typename, not an argument name. For example, after 1262 * "typedef double a;", the declaration "f(int (a));" is interpreted as 1263 * "f(int (double));", not "f(int a);". 1264 */ 1265 type_param_declarator: 1266 direct_param_declarator 1267 | pointer direct_param_declarator { 1268 $$ = add_pointer($2, $1); 1269 } 1270 ; 1271 1272 notype_param_declarator: 1273 direct_notype_param_declarator 1274 | pointer direct_notype_param_declarator { 1275 $$ = add_pointer($2, $1); 1276 } 1277 ; 1278 1279 direct_param_declarator: 1280 identifier type_attribute_list { 1281 $$ = declarator_name(getsym($1)); 1282 } 1283 | identifier { 1284 $$ = declarator_name(getsym($1)); 1285 } 1286 | T_LPAREN notype_param_declarator T_RPAREN { 1287 $$ = $2; 1288 } 1289 | direct_param_declarator T_LBRACK T_RBRACK { 1290 $$ = add_array($1, false, 0); 1291 } 1292 | direct_param_declarator T_LBRACK array_size T_RBRACK { 1293 $$ = add_array($1, true, to_int_constant($3, false)); 1294 } 1295 | direct_param_declarator param_list asm_or_symbolrename_opt { 1296 $$ = add_function(symbolrename($1, $3), $2); 1297 end_declaration_level(); 1298 block_level--; 1299 } 1300 ; 1301 1302 direct_notype_param_declarator: 1303 identifier { 1304 $$ = declarator_name(getsym($1)); 1305 } 1306 | T_LPAREN notype_param_declarator T_RPAREN { 1307 $$ = $2; 1308 } 1309 | direct_notype_param_declarator T_LBRACK T_RBRACK { 1310 $$ = add_array($1, false, 0); 1311 } 1312 | direct_notype_param_declarator T_LBRACK array_size T_RBRACK { 1313 $$ = add_array($1, true, to_int_constant($3, false)); 1314 } 1315 | direct_notype_param_declarator param_list asm_or_symbolrename_opt { 1316 $$ = add_function(symbolrename($1, $3), $2); 1317 end_declaration_level(); 1318 block_level--; 1319 } 1320 ; 1321 1322 param_list: 1323 id_list_lparen identifier_list T_RPAREN { 1324 $$ = $2; 1325 } 1326 | abstract_decl_param_list 1327 ; 1328 1329 id_list_lparen: 1330 T_LPAREN { 1331 block_level++; 1332 begin_declaration_level(PROTO_ARG); 1333 } 1334 ; 1335 1336 array_size: 1337 type_qualifier_list_opt T_SCLASS constant_expr { 1338 /* C11 6.7.6.3p7 */ 1339 if ($2 != STATIC) 1340 yyerror("Bad attribute"); 1341 /* static array size is a C11 extension */ 1342 c11ism(343); 1343 $$ = $3; 1344 } 1345 | constant_expr 1346 ; 1347 1348 identifier_list: /* C99 6.7.5 */ 1349 T_NAME { 1350 $$ = old_style_function_name(getsym($1)); 1351 } 1352 | identifier_list T_COMMA T_NAME { 1353 $$ = lnklst($1, old_style_function_name(getsym($3))); 1354 } 1355 | identifier_list error 1356 ; 1357 1358 /* XXX: C99 requires an additional specifier-qualifier-list. */ 1359 type_name: /* C99 6.7.6 */ 1360 { 1361 begin_declaration_level(ABSTRACT); 1362 } abstract_declaration { 1363 end_declaration_level(); 1364 $$ = $2->s_type; 1365 } 1366 ; 1367 1368 abstract_declaration: 1369 begin_type_noclass_declmods end_type { 1370 $$ = declare_1_abstract(abstract_name()); 1371 } 1372 | begin_type_noclass_declspecs end_type { 1373 $$ = declare_1_abstract(abstract_name()); 1374 } 1375 | begin_type_noclass_declmods end_type abstract_declarator { 1376 $$ = declare_1_abstract($3); 1377 } 1378 | begin_type_noclass_declspecs end_type abstract_declarator { 1379 $$ = declare_1_abstract($3); 1380 } 1381 ; 1382 1383 abstract_declarator: /* C99 6.7.6 */ 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 | T_TYPEOF cast_expression { /* GCC extension */ 1392 $$ = mktempsym($2->tn_type); 1393 } 1394 ; 1395 1396 direct_abstract_declarator: /* C99 6.7.6 */ 1397 T_LPAREN abstract_declarator T_RPAREN { 1398 $$ = $2; 1399 } 1400 | T_LBRACK T_RBRACK { 1401 $$ = add_array(abstract_name(), false, 0); 1402 } 1403 | T_LBRACK array_size T_RBRACK { 1404 $$ = add_array(abstract_name(), true, to_int_constant($2, false)); 1405 } 1406 | type_attribute direct_abstract_declarator { 1407 $$ = $2; 1408 } 1409 | direct_abstract_declarator T_LBRACK T_RBRACK { 1410 $$ = add_array($1, false, 0); 1411 } 1412 | direct_abstract_declarator T_LBRACK T_ASTERISK T_RBRACK { /* C99 */ 1413 $$ = add_array($1, false, 0); 1414 } 1415 | direct_abstract_declarator T_LBRACK array_size T_RBRACK { 1416 $$ = add_array($1, true, to_int_constant($3, false)); 1417 } 1418 | abstract_decl_param_list asm_or_symbolrename_opt { 1419 $$ = add_function(symbolrename(abstract_name(), $2), $1); 1420 end_declaration_level(); 1421 block_level--; 1422 } 1423 | direct_abstract_declarator abstract_decl_param_list asm_or_symbolrename_opt { 1424 $$ = 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: 1432 abstract_decl_lparen T_RPAREN type_attribute_opt { 1433 $$ = NULL; 1434 } 1435 | abstract_decl_lparen vararg_parameter_type_list T_RPAREN type_attribute_opt { 1436 dcs->d_proto = true; 1437 $$ = $2; 1438 } 1439 | abstract_decl_lparen error T_RPAREN type_attribute_opt { 1440 $$ = NULL; 1441 } 1442 ; 1443 1444 abstract_decl_lparen: 1445 T_LPAREN { 1446 block_level++; 1447 begin_declaration_level(PROTO_ARG); 1448 } 1449 ; 1450 1451 vararg_parameter_type_list: 1452 parameter_type_list 1453 | parameter_type_list T_COMMA T_ELLIPSIS { 1454 dcs->d_vararg = true; 1455 $$ = $1; 1456 } 1457 | T_ELLIPSIS { 1458 if (sflag) { 1459 /* ANSI C requires formal parameter before '...' */ 1460 error(84); 1461 } else if (!tflag) { 1462 /* ANSI C requires formal parameter before '...' */ 1463 warning(84); 1464 } 1465 dcs->d_vararg = true; 1466 $$ = NULL; 1467 } 1468 ; 1469 1470 /* XXX: C99 6.7.5 defines the same name, but it looks different. */ 1471 parameter_type_list: 1472 parameter_declaration 1473 | parameter_type_list T_COMMA parameter_declaration { 1474 $$ = lnklst($1, $3); 1475 } 1476 ; 1477 1478 /* XXX: C99 6.7.5 defines the same name, but it looks completely different. */ 1479 parameter_declaration: 1480 begin_type_declmods end_type { 1481 $$ = declare_argument(abstract_name(), false); 1482 } 1483 | begin_type_declaration_specifiers end_type { 1484 $$ = declare_argument(abstract_name(), false); 1485 } 1486 | begin_type_declmods end_type notype_param_declarator { 1487 $$ = declare_argument($3, false); 1488 } 1489 /* 1490 * type_param_declarator is needed because of following conflict: 1491 * "typedef int a; f(int (a));" could be parsed as 1492 * "function with argument a of type int", or 1493 * "function with an abstract argument of type function". 1494 * This grammar realizes the second case. 1495 */ 1496 | begin_type_declaration_specifiers end_type type_param_declarator { 1497 $$ = declare_argument($3, false); 1498 } 1499 | begin_type_declmods end_type abstract_declarator { 1500 $$ = declare_argument($3, false); 1501 } 1502 | begin_type_declaration_specifiers end_type abstract_declarator { 1503 $$ = declare_argument($3, false); 1504 } 1505 ; 1506 1507 initializer: /* C99 6.7.8 "Initialization" */ 1508 assignment_expression { 1509 init_expr($1); 1510 } 1511 | init_lbrace init_rbrace { 1512 /* XXX: Empty braces are not covered by C99 6.7.8. */ 1513 } 1514 | init_lbrace initializer_list comma_opt init_rbrace 1515 | error 1516 ; 1517 1518 initializer_list: /* C99 6.7.8 "Initialization" */ 1519 initializer_list_item 1520 | initializer_list T_COMMA initializer_list_item 1521 ; 1522 1523 initializer_list_item: /* helper */ 1524 designation initializer 1525 | initializer 1526 ; 1527 1528 designation: /* C99 6.7.8 "Initialization" */ 1529 designator_list T_ASSIGN 1530 | identifier T_COLON { 1531 /* GCC style struct or union member name in initializer */ 1532 gnuism(315); 1533 add_designator_member($1); 1534 } 1535 ; 1536 1537 designator_list: /* C99 6.7.8 "Initialization" */ 1538 designator 1539 | designator_list designator 1540 ; 1541 1542 designator: /* C99 6.7.8 "Initialization" */ 1543 T_LBRACK range T_RBRACK { 1544 add_designator_subscript($2); 1545 if (!Sflag) 1546 /* array initializer with des.s is a C9X feature */ 1547 warning(321); 1548 } 1549 | T_POINT identifier { 1550 if (!Sflag) 1551 /* struct or union member name in initializer is ... */ 1552 warning(313); 1553 add_designator_member($2); 1554 } 1555 ; 1556 1557 range: 1558 constant_expr { 1559 $$.lo = to_int_constant($1, true); 1560 $$.hi = $$.lo; 1561 } 1562 | constant_expr T_ELLIPSIS constant_expr { 1563 $$.lo = to_int_constant($1, true); 1564 $$.hi = to_int_constant($3, true); 1565 /* initialization with '[a...b]' is a GCC extension */ 1566 gnuism(340); 1567 } 1568 ; 1569 1570 init_lbrace: /* helper */ 1571 T_LBRACE { 1572 init_lbrace(); 1573 } 1574 ; 1575 1576 init_rbrace: /* helper */ 1577 T_RBRACE { 1578 init_rbrace(); 1579 } 1580 ; 1581 1582 asm_or_symbolrename_opt: /* GCC extensions */ 1583 /* empty */ { 1584 $$ = NULL; 1585 } 1586 | T_ASM T_LPAREN T_STRING T_RPAREN { 1587 freeyyv(&$3, T_STRING); 1588 $$ = NULL; 1589 } 1590 | T_SYMBOLRENAME T_LPAREN T_NAME T_RPAREN { 1591 $$ = $3; 1592 } 1593 ; 1594 1595 statement: /* C99 6.8 */ 1596 expression_statement 1597 | non_expr_statement 1598 ; 1599 1600 non_expr_statement: /* helper for C99 6.8 */ 1601 type_attribute T_SEMI 1602 | labeled_statement 1603 | compound_statement 1604 | selection_statement 1605 | iteration_statement 1606 | jump_statement { 1607 seen_fallthrough = false; 1608 } 1609 | asm_statement 1610 ; 1611 1612 labeled_statement: /* C99 6.8.1 */ 1613 label type_attribute_opt statement 1614 ; 1615 1616 label: 1617 T_NAME T_COLON { 1618 symtyp = FLABEL; 1619 named_label(getsym($1)); 1620 } 1621 | T_CASE constant_expr T_COLON { 1622 case_label($2); 1623 seen_fallthrough = true; 1624 } 1625 | T_CASE constant_expr T_ELLIPSIS constant_expr T_COLON { 1626 /* XXX: We don't fill all cases */ 1627 case_label($2); 1628 seen_fallthrough = true; 1629 } 1630 | T_DEFAULT T_COLON { 1631 default_label(); 1632 seen_fallthrough = true; 1633 } 1634 ; 1635 1636 compound_statement: /* C99 6.8.2 */ 1637 compound_statement_lbrace compound_statement_rbrace 1638 | compound_statement_lbrace block_item_list compound_statement_rbrace 1639 ; 1640 1641 compound_statement_lbrace: 1642 T_LBRACE { 1643 block_level++; 1644 mem_block_level++; 1645 begin_declaration_level(AUTO); 1646 } 1647 ; 1648 1649 compound_statement_rbrace: 1650 T_RBRACE { 1651 end_declaration_level(); 1652 freeblk(); 1653 mem_block_level--; 1654 block_level--; 1655 seen_fallthrough = false; 1656 } 1657 ; 1658 1659 block_item_list: /* C99 6.8.2 */ 1660 block_item 1661 | block_item_list block_item { 1662 if (!Sflag && $1 && !$2) 1663 /* declarations after statements is a C99 feature */ 1664 c99ism(327); 1665 $$ = $1 || $2; 1666 } 1667 ; 1668 1669 block_item: /* C99 6.8.2 */ 1670 declaration_or_error { 1671 $$ = false; 1672 restore_warning_flags(); 1673 } 1674 | statement { 1675 $$ = true; 1676 restore_warning_flags(); 1677 } 1678 ; 1679 1680 expression_statement: /* C99 6.8.3 */ 1681 expression T_SEMI { 1682 expr($1, false, false, false, false); 1683 seen_fallthrough = false; 1684 } 1685 | T_SEMI { 1686 seen_fallthrough = false; 1687 } 1688 ; 1689 1690 selection_statement: /* C99 6.8.4 */ 1691 if_without_else %prec T_THEN { 1692 save_warning_flags(); 1693 if2(); 1694 if3(false); 1695 } 1696 | if_without_else T_ELSE { 1697 save_warning_flags(); 1698 if2(); 1699 } statement { 1700 clear_warning_flags(); 1701 if3(true); 1702 } 1703 | if_without_else T_ELSE error { 1704 clear_warning_flags(); 1705 if3(false); 1706 } 1707 | switch_expr statement { 1708 clear_warning_flags(); 1709 switch2(); 1710 } 1711 | switch_expr error { 1712 clear_warning_flags(); 1713 switch2(); 1714 } 1715 ; 1716 1717 if_without_else: /* see C99 6.8.4 */ 1718 if_expr statement 1719 | if_expr error 1720 ; 1721 1722 if_expr: /* see C99 6.8.4 */ 1723 T_IF T_LPAREN expression T_RPAREN { 1724 if1($3); 1725 clear_warning_flags(); 1726 } 1727 ; 1728 1729 switch_expr: /* see C99 6.8.4 */ 1730 T_SWITCH T_LPAREN expression T_RPAREN { 1731 switch1($3); 1732 clear_warning_flags(); 1733 } 1734 ; 1735 1736 iteration_statement: /* C99 6.8.5 */ 1737 while_expr statement { 1738 clear_warning_flags(); 1739 while2(); 1740 } 1741 | while_expr error { 1742 clear_warning_flags(); 1743 while2(); 1744 } 1745 | do_statement do_while_expr { 1746 do2($2); 1747 seen_fallthrough = false; 1748 } 1749 | do error { 1750 clear_warning_flags(); 1751 do2(NULL); 1752 } 1753 | for_exprs statement { 1754 clear_warning_flags(); 1755 for2(); 1756 end_declaration_level(); 1757 block_level--; 1758 } 1759 | for_exprs error { 1760 clear_warning_flags(); 1761 for2(); 1762 end_declaration_level(); 1763 block_level--; 1764 } 1765 ; 1766 1767 while_expr: /* see C99 6.8.5 */ 1768 T_WHILE T_LPAREN expression T_RPAREN { 1769 while1($3); 1770 clear_warning_flags(); 1771 } 1772 ; 1773 1774 do_statement: /* see C99 6.8.5 */ 1775 do statement { 1776 clear_warning_flags(); 1777 } 1778 ; 1779 1780 do: /* see C99 6.8.5 */ 1781 T_DO { 1782 do1(); 1783 } 1784 ; 1785 1786 do_while_expr: /* see C99 6.8.5 */ 1787 T_WHILE T_LPAREN expression T_RPAREN T_SEMI { 1788 $$ = $3; 1789 } 1790 ; 1791 1792 for_start: /* see C99 6.8.5 */ 1793 T_FOR T_LPAREN { 1794 begin_declaration_level(AUTO); 1795 block_level++; 1796 } 1797 ; 1798 1799 for_exprs: /* see C99 6.8.5 */ 1800 for_start 1801 begin_type_declaration_specifiers end_type 1802 notype_init_declarators T_SEMI 1803 expression_opt T_SEMI expression_opt T_RPAREN { 1804 /* variable declaration in for loop */ 1805 c99ism(325); 1806 for1(NULL, $6, $8); 1807 clear_warning_flags(); 1808 } 1809 | for_start 1810 expression_opt T_SEMI 1811 expression_opt T_SEMI 1812 expression_opt T_RPAREN { 1813 for1($2, $4, $6); 1814 clear_warning_flags(); 1815 } 1816 ; 1817 1818 jump_statement: /* C99 6.8.6 */ 1819 goto identifier T_SEMI { 1820 do_goto(getsym($2)); 1821 } 1822 | goto error T_SEMI { 1823 symtyp = FVFT; 1824 } 1825 | T_CONTINUE T_SEMI { 1826 do_continue(); 1827 } 1828 | T_BREAK T_SEMI { 1829 do_break(); 1830 } 1831 | T_RETURN T_SEMI { 1832 do_return(NULL); 1833 } 1834 | T_RETURN expression T_SEMI { 1835 do_return($2); 1836 } 1837 ; 1838 1839 goto: /* see C99 6.8.6 */ 1840 T_GOTO { 1841 symtyp = FLABEL; 1842 } 1843 ; 1844 1845 asm_statement: /* GCC extension */ 1846 T_ASM T_LPAREN read_until_rparen T_SEMI { 1847 setasm(); 1848 } 1849 | T_ASM T_QUAL T_LPAREN read_until_rparen T_SEMI { 1850 setasm(); 1851 } 1852 | T_ASM error 1853 ; 1854 1855 read_until_rparen: /* helper for 'asm_statement' */ 1856 /* empty */ { 1857 ignore_up_to_rparen(); 1858 } 1859 ; 1860 1861 translation_unit: /* C99 6.9 */ 1862 external_declaration 1863 | translation_unit external_declaration 1864 ; 1865 1866 external_declaration: /* C99 6.9 */ 1867 asm_statement 1868 | function_definition { 1869 global_clean_up_decl(false); 1870 clear_warning_flags(); 1871 } 1872 | top_level_declaration { 1873 global_clean_up_decl(false); 1874 clear_warning_flags(); 1875 } 1876 ; 1877 1878 /* 1879 * On the top level, lint allows several forms of declarations that it doesn't 1880 * allow in functions. For example, a single ';' is an empty declaration and 1881 * is supported by some compilers, but in a function it would be an empty 1882 * statement, not a declaration. This makes a difference in C90 mode, where 1883 * a statement must not be followed by a declaration. 1884 * 1885 * See 'declaration' for all other declarations. 1886 */ 1887 top_level_declaration: /* C99 6.9 calls this 'declaration' */ 1888 T_SEMI { 1889 if (sflag) { 1890 /* empty declaration */ 1891 error(0); 1892 } else if (!tflag) { 1893 /* empty declaration */ 1894 warning(0); 1895 } 1896 } 1897 | begin_type end_type notype_init_declarators T_SEMI { 1898 if (sflag) { 1899 /* old style declaration; add 'int' */ 1900 error(1); 1901 } else if (!tflag) { 1902 /* old style declaration; add 'int' */ 1903 warning(1); 1904 } 1905 } 1906 | declaration 1907 | error T_SEMI { 1908 global_clean_up(); 1909 } 1910 | error T_RBRACE { 1911 global_clean_up(); 1912 } 1913 ; 1914 1915 function_definition: /* C99 6.9.1 */ 1916 func_declarator { 1917 if ($1->s_type->t_tspec != FUNC) { 1918 /* syntax error '%s' */ 1919 error(249, yytext); 1920 YYERROR; 1921 } 1922 if ($1->s_type->t_typedef) { 1923 /* ()-less function definition */ 1924 error(64); 1925 YYERROR; 1926 } 1927 funcdef($1); 1928 block_level++; 1929 begin_declaration_level(ARG); 1930 if (lwarn == LWARN_NONE) 1931 $1->s_used = true; 1932 } arg_declaration_list_opt { 1933 end_declaration_level(); 1934 block_level--; 1935 check_func_lint_directives(); 1936 check_func_old_style_arguments(); 1937 begin_control_statement(CS_FUNCTION_BODY); 1938 } compound_statement { 1939 funcend(); 1940 end_control_statement(CS_FUNCTION_BODY); 1941 } 1942 ; 1943 1944 func_declarator: 1945 begin_type end_type notype_declarator { 1946 $$ = $3; 1947 } 1948 | begin_type_declmods end_type notype_declarator { 1949 $$ = $3; 1950 } 1951 | begin_type_declaration_specifiers end_type type_declarator { 1952 $$ = $3; 1953 } 1954 ; 1955 1956 arg_declaration_list_opt: /* C99 6.9.1p13 example 1 */ 1957 /* empty */ 1958 | arg_declaration_list 1959 ; 1960 1961 arg_declaration_list: /* C99 6.9.1p13 example 1 */ 1962 arg_declaration 1963 | arg_declaration_list arg_declaration 1964 /* XXX or better "arg_declaration error" ? */ 1965 | error 1966 ; 1967 1968 /* 1969 * "arg_declaration" is separated from "declaration" because it 1970 * needs other error handling. 1971 */ 1972 arg_declaration: 1973 begin_type_declmods end_type T_SEMI { 1974 /* empty declaration */ 1975 warning(2); 1976 } 1977 | begin_type_declmods end_type notype_init_declarators T_SEMI 1978 | begin_type_declaration_specifiers end_type T_SEMI { 1979 if (!dcs->d_nonempty_decl) { 1980 /* empty declaration */ 1981 warning(2); 1982 } else { 1983 /* '%s' declared in argument declaration list */ 1984 warning(3, type_name(dcs->d_type)); 1985 } 1986 } 1987 | begin_type_declaration_specifiers end_type 1988 type_init_declarators T_SEMI { 1989 if (dcs->d_nonempty_decl) { 1990 /* '%s' declared in argument declaration list */ 1991 warning(3, type_name(dcs->d_type)); 1992 } 1993 } 1994 | begin_type_declmods error 1995 | begin_type_declaration_specifiers error 1996 ; 1997 1998 gcc_attribute_spec_list: 1999 gcc_attribute_spec 2000 | gcc_attribute_spec_list T_COMMA gcc_attribute_spec 2001 ; 2002 2003 gcc_attribute_spec: 2004 /* empty */ 2005 | T_AT_ALWAYS_INLINE 2006 | T_AT_ALIAS T_LPAREN string T_RPAREN 2007 | T_AT_ALIGNED T_LPAREN constant_expr T_RPAREN 2008 | T_AT_ALIGNED 2009 | T_AT_ALLOC_SIZE T_LPAREN constant_expr T_COMMA constant_expr T_RPAREN 2010 | T_AT_ALLOC_SIZE T_LPAREN constant_expr T_RPAREN 2011 | T_AT_BOUNDED T_LPAREN gcc_attribute_bounded 2012 T_COMMA constant_expr T_COMMA constant_expr T_RPAREN 2013 | T_AT_COLD 2014 | T_AT_COMMON 2015 | T_AT_CONSTRUCTOR T_LPAREN constant_expr T_RPAREN 2016 | T_AT_CONSTRUCTOR 2017 | T_AT_DEPRECATED T_LPAREN string T_RPAREN 2018 | T_AT_DEPRECATED 2019 | T_AT_DESTRUCTOR T_LPAREN constant_expr T_RPAREN 2020 | T_AT_DESTRUCTOR 2021 | T_AT_FALLTHROUGH { 2022 fallthru(1); 2023 } 2024 | T_AT_FORMAT T_LPAREN gcc_attribute_format T_COMMA 2025 constant_expr T_COMMA constant_expr T_RPAREN 2026 | T_AT_FORMAT_ARG T_LPAREN constant_expr T_RPAREN 2027 | T_AT_GNU_INLINE 2028 | T_AT_HOT 2029 | T_AT_MALLOC 2030 | T_AT_MAY_ALIAS 2031 | T_AT_MODE T_LPAREN T_NAME T_RPAREN 2032 | T_AT_NOINLINE 2033 | T_AT_NONNULL T_LPAREN constant_expr_list_opt T_RPAREN 2034 | T_AT_NONNULL 2035 | T_AT_NONSTRING 2036 | T_AT_NORETURN 2037 | T_AT_NOTHROW 2038 | T_AT_NO_INSTRUMENT_FUNCTION 2039 | T_AT_OPTIMIZE T_LPAREN string T_RPAREN 2040 | T_AT_PACKED { 2041 addpacked(); 2042 } 2043 | T_AT_PCS T_LPAREN string T_RPAREN 2044 | T_AT_PURE 2045 | T_AT_RETURNS_TWICE 2046 | T_AT_SECTION T_LPAREN string T_RPAREN 2047 | T_AT_SENTINEL T_LPAREN constant_expr T_RPAREN 2048 | T_AT_SENTINEL 2049 | T_AT_TLS_MODEL T_LPAREN string T_RPAREN 2050 | T_AT_TUNION 2051 | T_AT_UNUSED { 2052 add_attr_used(); 2053 } 2054 | T_AT_USED { 2055 add_attr_used(); 2056 } 2057 | T_AT_VISIBILITY T_LPAREN constant_expr T_RPAREN 2058 | T_AT_WARN_UNUSED_RESULT 2059 | T_AT_WEAK 2060 | T_QUAL { 2061 if ($1 != CONST) 2062 yyerror("Bad attribute"); 2063 } 2064 ; 2065 2066 gcc_attribute_bounded: 2067 T_AT_MINBYTES 2068 | T_AT_STRING 2069 | T_AT_BUFFER 2070 ; 2071 2072 gcc_attribute_format: 2073 T_AT_FORMAT_GNU_PRINTF 2074 | T_AT_FORMAT_PRINTF 2075 | T_AT_FORMAT_SCANF 2076 | T_AT_FORMAT_STRFMON 2077 | T_AT_FORMAT_STRFTIME 2078 | T_AT_FORMAT_SYSLOG 2079 ; 2080 2081 %% 2082 2083 /* ARGSUSED */ 2084 int 2085 yyerror(const char *msg) 2086 { 2087 /* syntax error '%s' */ 2088 error(249, yytext); 2089 if (++sytxerr >= 5) 2090 norecover(); 2091 return 0; 2092 } 2093 2094 static void 2095 cgram_declare(sym_t *decl, bool initflg, sbuf_t *renaming) 2096 { 2097 declare(decl, initflg, renaming); 2098 if (renaming != NULL) 2099 freeyyv(&renaming, T_NAME); 2100 } 2101 2102 /* 2103 * Discard all input tokens up to and including the next 2104 * unmatched right paren 2105 */ 2106 static void 2107 ignore_up_to_rparen(void) 2108 { 2109 int level; 2110 2111 if (yychar < 0) 2112 yychar = yylex(); 2113 freeyyv(&yylval, yychar); 2114 2115 level = 1; 2116 while (yychar != T_RPAREN || --level > 0) { 2117 if (yychar == T_LPAREN) { 2118 level++; 2119 } else if (yychar <= 0) { 2120 break; 2121 } 2122 freeyyv(&yylval, yychar = yylex()); 2123 } 2124 2125 yyclearin; 2126 } 2127 2128 static sym_t * 2129 symbolrename(sym_t *s, sbuf_t *sb) 2130 { 2131 if (sb != NULL) 2132 s->s_rename = sb->sb_name; 2133 return s; 2134 } 2135
Indexes created Thu Oct 02 14:10:14 GMT 2025