cgram.y revision 1.341
1 %{ 2 /* $NetBSD: cgram.y,v 1.341 2021/07/25 18:44:21 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 1.341 2021/07/25 18:44:21 rillig Exp $"); 39 #endif 40 41 #include <limits.h> 42 #include <stdlib.h> 43 #include <string.h> 44 45 #include "lint1.h" 46 47 extern char *yytext; 48 49 /* 50 * Contains the level of current declaration, used for symbol table entries. 51 * 0 is the top-level, > 0 is inside a function body. 52 */ 53 int block_level; 54 55 /* 56 * level for memory allocation. Normally the same as block_level. 57 * An exception is the declaration of arguments in prototypes. Memory 58 * for these can't be freed after the declaration, but symbols must 59 * be removed from the symbol table after the declaration. 60 */ 61 int mem_block_level; 62 63 /* 64 * Save the no-warns state and restore it to avoid the problem where 65 * if (expr) { stmt } / * NOLINT * / stmt; 66 */ 67 static int olwarn = LWARN_BAD; 68 69 static void cgram_declare(sym_t *, bool, sbuf_t *); 70 static void read_until_rparen(void); 71 static sym_t *symbolrename(sym_t *, sbuf_t *); 72 73 74 #ifdef DEBUG 75 static void 76 CLEAR_WARN_FLAGS(const char *file, size_t line) 77 { 78 printf("%s:%d: %s:%zu: clearing flags\n", 79 curr_pos.p_file, curr_pos.p_line, file, line); 80 clear_warn_flags(); 81 olwarn = LWARN_BAD; 82 } 83 84 static void 85 SAVE_WARN_FLAGS(const char *file, size_t line) 86 { 87 lint_assert(olwarn == LWARN_BAD); 88 printf("%s:%d: %s:%zu: saving flags %d\n", 89 curr_pos.p_file, curr_pos.p_line, file, line, lwarn); 90 olwarn = lwarn; 91 } 92 93 static void 94 RESTORE_WARN_FLAGS(const char *file, size_t line) 95 { 96 if (olwarn != LWARN_BAD) { 97 lwarn = olwarn; 98 printf("%s:%d: %s:%zu: restoring flags %d\n", 99 curr_pos.p_file, curr_pos.p_line, file, line, lwarn); 100 olwarn = LWARN_BAD; 101 } else 102 CLEAR_WARN_FLAGS(file, line); 103 } 104 #define cgram_debug(fmt, args...) printf("cgram_debug: " fmt "\n", ##args) 105 #else 106 #define CLEAR_WARN_FLAGS(f, l) clear_warn_flags(), olwarn = LWARN_BAD 107 #define SAVE_WARN_FLAGS(f, l) olwarn = lwarn 108 #define RESTORE_WARN_FLAGS(f, l) \ 109 (void)(olwarn == LWARN_BAD ? (clear_warn_flags(), 0) : (lwarn = olwarn)) 110 #define cgram_debug(fmt, args...) do { } while (false) 111 #endif 112 113 #define clear_warning_flags() CLEAR_WARN_FLAGS(__FILE__, __LINE__) 114 #define save_warning_flags() SAVE_WARN_FLAGS(__FILE__, __LINE__) 115 #define restore_warning_flags() RESTORE_WARN_FLAGS(__FILE__, __LINE__) 116 117 /* unbind the anonymous struct members from the struct */ 118 static void 119 anonymize(sym_t *s) 120 { 121 for ( ; s != NULL; s = s->s_next) 122 s->s_styp = NULL; 123 } 124 125 %} 126 127 %expect 159 128 129 %union { 130 val_t *y_val; 131 sbuf_t *y_name; 132 sym_t *y_sym; 133 op_t y_op; 134 scl_t y_scl; 135 tspec_t y_tspec; 136 tqual_t y_tqual; 137 type_t *y_type; 138 tnode_t *y_tnode; 139 range_t y_range; 140 strg_t *y_string; 141 qual_ptr *y_qual_ptr; 142 bool y_seen_statement; 143 struct generic_association *y_generic; 144 }; 145 146 %token T_LBRACE T_RBRACE T_LBRACK T_RBRACK T_LPAREN T_RPAREN 147 %token T_POINT T_ARROW 148 %token T_COMPLEMENT T_LOGNOT 149 %token <y_op> T_INCDEC 150 %token T_SIZEOF 151 %token T_BUILTIN_OFFSETOF 152 %token T_TYPEOF 153 %token T_EXTENSION 154 %token T_ALIGNAS 155 %token T_ALIGNOF 156 %token T_ASTERISK 157 %token <y_op> T_MULTIPLICATIVE 158 %token <y_op> T_ADDITIVE 159 %token <y_op> T_SHIFT 160 %token <y_op> T_RELATIONAL 161 %token <y_op> T_EQUALITY 162 %token T_AMPER 163 %token T_BITXOR 164 %token T_BITOR 165 %token T_LOGAND 166 %token T_LOGOR 167 %token T_QUEST 168 %token T_COLON 169 %token T_ASSIGN 170 %token <y_op> T_OPASSIGN 171 %token T_COMMA 172 %token T_SEMI 173 %token T_ELLIPSIS 174 %token T_REAL 175 %token T_IMAG 176 %token T_GENERIC 177 %token T_NORETURN 178 179 /* storage classes (extern, static, auto, register and typedef) */ 180 %token <y_scl> T_SCLASS 181 182 /* 183 * predefined type keywords (char, int, short, long, unsigned, signed, 184 * float, double, void); see T_TYPENAME for types from typedef 185 */ 186 %token <y_tspec> T_TYPE 187 188 /* qualifiers (const, volatile, restrict, _Thread_local) */ 189 %token <y_tqual> T_QUAL 190 191 /* struct or union */ 192 %token <y_tspec> T_STRUCT_OR_UNION 193 194 /* remaining keywords */ 195 %token T_ASM 196 %token T_BREAK 197 %token T_CASE 198 %token T_CONTINUE 199 %token T_DEFAULT 200 %token T_DO 201 %token T_ELSE 202 %token T_ENUM 203 %token T_FOR 204 %token T_GOTO 205 %token T_IF 206 %token T_PACKED 207 %token T_RETURN 208 %token T_SWITCH 209 %token T_SYMBOLRENAME 210 %token T_WHILE 211 212 %token T_ATTRIBUTE 213 %token T_AT_ALIAS 214 %token T_AT_ALIGNED 215 %token T_AT_ALLOC_SIZE 216 %token T_AT_ALWAYS_INLINE 217 %token T_AT_BOUNDED 218 %token T_AT_BUFFER 219 %token T_AT_COLD 220 %token T_AT_COMMON 221 %token T_AT_CONSTRUCTOR 222 %token T_AT_DEPRECATED 223 %token T_AT_DESTRUCTOR 224 %token T_AT_FALLTHROUGH 225 %token T_AT_FORMAT 226 %token T_AT_FORMAT_ARG 227 %token T_AT_FORMAT_GNU_PRINTF 228 %token T_AT_FORMAT_PRINTF 229 %token T_AT_FORMAT_SCANF 230 %token T_AT_FORMAT_STRFMON 231 %token T_AT_FORMAT_STRFTIME 232 %token T_AT_FORMAT_SYSLOG 233 %token T_AT_GNU_INLINE 234 %token T_AT_HOT 235 %token T_AT_MALLOC 236 %token T_AT_MAY_ALIAS 237 %token T_AT_MINBYTES 238 %token T_AT_MODE 239 %token T_AT_NOINLINE 240 %token T_AT_NONNULL 241 %token T_AT_NONSTRING 242 %token T_AT_NORETURN 243 %token T_AT_NOTHROW 244 %token T_AT_NO_INSTRUMENT_FUNCTION 245 %token T_AT_OPTIMIZE 246 %token T_AT_PACKED 247 %token T_AT_PCS 248 %token T_AT_PURE 249 %token T_AT_RETURNS_TWICE 250 %token T_AT_SECTION 251 %token T_AT_SENTINEL 252 %token T_AT_STRING 253 %token T_AT_TLS_MODEL 254 %token T_AT_TUNION 255 %token T_AT_UNUSED 256 %token T_AT_USED 257 %token T_AT_VISIBILITY 258 %token T_AT_WARN_UNUSED_RESULT 259 %token T_AT_WEAK 260 261 %left T_THEN 262 %left T_ELSE 263 %left T_COMMA 264 %right T_ASSIGN T_OPASSIGN 265 %right T_QUEST T_COLON 266 %left T_LOGOR 267 %left T_LOGAND 268 %left T_BITOR 269 %left T_BITXOR 270 %left T_AMPER 271 %left T_EQUALITY 272 %left T_RELATIONAL 273 %left T_SHIFT 274 %left T_ADDITIVE 275 %left T_ASTERISK T_MULTIPLICATIVE 276 277 %token <y_name> T_NAME 278 %token <y_name> T_TYPENAME 279 %token <y_val> T_CON 280 %token <y_string> T_STRING 281 282 %type <y_sym> identifier_sym 283 %type <y_name> identifier 284 %type <y_string> string 285 %type <y_string> string2 286 287 %type <y_tnode> primary_expression 288 %type <y_tnode> generic_selection 289 %type <y_generic> generic_assoc_list 290 %type <y_generic> generic_association 291 %type <y_tnode> postfix_expression 292 %type <y_tnode> gcc_statement_expr_list 293 %type <y_tnode> gcc_statement_expr_item 294 %type <y_op> point_or_arrow 295 %type <y_tnode> argument_expression_list 296 %type <y_tnode> unary_expression 297 %type <y_tnode> cast_expression 298 %type <y_tnode> conditional_expression 299 %type <y_tnode> assignment_expression 300 %type <y_tnode> expression_opt 301 %type <y_tnode> expression 302 %type <y_tnode> constant_expr 303 304 %type <y_type> begin_type_typespec 305 %type <y_type> type_specifier 306 %type <y_type> notype_type_specifier 307 %type <y_type> struct_or_union_specifier 308 %type <y_tspec> struct_or_union 309 %type <y_sym> braced_struct_declaration_list 310 %type <y_sym> struct_declaration_list_with_rbrace 311 %type <y_sym> struct_declaration_list 312 %type <y_sym> struct_declaration 313 %type <y_sym> notype_struct_declarators 314 %type <y_sym> type_struct_declarators 315 %type <y_sym> notype_struct_declarator 316 %type <y_sym> type_struct_declarator 317 %type <y_type> enum_specifier 318 %type <y_sym> enum_declaration 319 %type <y_sym> enums_with_opt_comma 320 %type <y_sym> enumerator_list 321 %type <y_sym> enumerator 322 %type <y_qual_ptr> type_qualifier 323 %type <y_qual_ptr> pointer 324 %type <y_qual_ptr> asterisk 325 %type <y_qual_ptr> type_qualifier_list_opt 326 %type <y_qual_ptr> type_qualifier_list 327 %type <y_sym> notype_declarator 328 %type <y_sym> type_declarator 329 %type <y_sym> notype_direct_declarator 330 %type <y_sym> type_direct_declarator 331 %type <y_sym> type_param_declarator 332 %type <y_sym> notype_param_declarator 333 %type <y_sym> direct_param_declarator 334 %type <y_sym> direct_notype_param_declarator 335 %type <y_sym> param_list 336 %type <y_tnode> array_size 337 %type <y_sym> identifier_list 338 %type <y_type> type_name 339 %type <y_sym> abstract_declaration 340 %type <y_sym> abstract_declarator 341 %type <y_sym> direct_abstract_declarator 342 %type <y_sym> abstract_decl_param_list 343 %type <y_sym> vararg_parameter_type_list 344 %type <y_sym> parameter_type_list 345 %type <y_sym> parameter_declaration 346 %type <y_range> range 347 %type <y_name> asm_or_symbolrename_opt 348 349 %type <y_seen_statement> block_item_list 350 %type <y_seen_statement> block_item 351 %type <y_tnode> do_while_expr 352 %type <y_sym> func_declarator 353 354 %% 355 356 program: 357 /* empty */ { 358 if (sflag) { 359 /* empty translation unit */ 360 error(272); 361 } else if (!tflag) { 362 /* empty translation unit */ 363 warning(272); 364 } 365 } 366 | translation_unit 367 ; 368 369 identifier_sym: /* helper for struct/union/enum */ 370 identifier { 371 $$ = getsym($1); 372 } 373 ; 374 375 /* K&R ???, C90 ???, C99 6.4.2.1, C11 ??? */ 376 identifier: 377 T_NAME { 378 cgram_debug("name '%s'", $1->sb_name); 379 $$ = $1; 380 } 381 | T_TYPENAME { 382 cgram_debug("typename '%s'", $1->sb_name); 383 $$ = $1; 384 } 385 ; 386 387 /* see C99 6.4.5, string literals are joined by 5.1.1.2 */ 388 string: 389 T_STRING 390 | T_STRING string2 { 391 $$ = cat_strings($1, $2); 392 } 393 ; 394 395 /* see C99 6.4.5, string literals are joined by 5.1.1.2 */ 396 string2: 397 T_STRING { 398 if (tflag) { 399 /* concatenated strings are illegal in traditional C */ 400 warning(219); 401 } 402 $$ = $1; 403 } 404 | string2 T_STRING { 405 $$ = cat_strings($1, $2); 406 } 407 ; 408 409 /* K&R 7.1, C90 ???, C99 6.5.1, C11 6.5.1 */ 410 primary_expression: 411 T_NAME { 412 /* XXX really necessary? */ 413 if (yychar < 0) 414 yychar = yylex(); 415 $$ = build_name(getsym($1), yychar); 416 } 417 | T_CON { 418 $$ = build_constant(gettyp($1->v_tspec), $1); 419 } 420 | string { 421 $$ = build_string($1); 422 } 423 | T_LPAREN expression T_RPAREN { 424 if ($2 != NULL) 425 $2->tn_parenthesized = true; 426 $$ = $2; 427 } 428 | generic_selection 429 /* GCC primary-expression, see c_parser_postfix_expression */ 430 | T_BUILTIN_OFFSETOF T_LPAREN type_name T_COMMA identifier T_RPAREN { 431 symtyp = FMEMBER; 432 $$ = build_offsetof($3, getsym($5)); 433 } 434 ; 435 436 /* K&R ---, C90 ---, C99 ---, C11 6.5.1.1 */ 437 generic_selection: 438 T_GENERIC T_LPAREN assignment_expression T_COMMA 439 generic_assoc_list T_RPAREN { 440 /* generic selection requires C11 or later */ 441 c11ism(345); 442 $$ = build_generic_selection($3, $5); 443 } 444 ; 445 446 /* K&R ---, C90 ---, C99 ---, C11 6.5.1.1 */ 447 generic_assoc_list: 448 generic_association 449 | generic_assoc_list T_COMMA generic_association { 450 $3->ga_prev = $1; 451 $$ = $3; 452 } 453 ; 454 455 /* K&R ---, C90 ---, C99 ---, C11 6.5.1.1 */ 456 generic_association: 457 type_name T_COLON assignment_expression { 458 $$ = getblk(sizeof(*$$)); 459 $$->ga_arg = $1; 460 $$->ga_result = $3; 461 } 462 | T_DEFAULT T_COLON assignment_expression { 463 $$ = getblk(sizeof(*$$)); 464 $$->ga_arg = NULL; 465 $$->ga_result = $3; 466 } 467 ; 468 469 /* K&R 7.1, C90 ???, C99 6.5.2, C11 6.5.2 */ 470 postfix_expression: 471 primary_expression 472 | postfix_expression T_LBRACK expression T_RBRACK { 473 $$ = build_unary(INDIR, build_binary($1, PLUS, $3)); 474 } 475 | postfix_expression T_LPAREN T_RPAREN { 476 $$ = build_function_call($1, NULL); 477 } 478 | postfix_expression T_LPAREN argument_expression_list T_RPAREN { 479 $$ = build_function_call($1, $3); 480 } 481 | postfix_expression point_or_arrow T_NAME { 482 $$ = build_member_access($1, $2, $3); 483 } 484 | postfix_expression T_INCDEC { 485 $$ = build_unary($2 == INC ? INCAFT : DECAFT, $1); 486 } 487 | T_LPAREN type_name T_RPAREN { /* C99 6.5.2.5 "Compound literals" */ 488 sym_t *tmp = mktempsym($2); 489 begin_initialization(tmp); 490 cgram_declare(tmp, true, NULL); 491 } init_lbrace initializer_list comma_opt init_rbrace { 492 if (!Sflag) 493 /* compound literals are a C9X/GCC extension */ 494 gnuism(319); 495 $$ = build_name(*current_initsym(), 0); 496 end_initialization(); 497 } 498 | T_LPAREN compound_statement_lbrace gcc_statement_expr_list { 499 block_level--; 500 mem_block_level--; 501 begin_initialization(mktempsym(dup_type($3->tn_type))); 502 mem_block_level++; 503 block_level++; 504 /* ({ }) is a GCC extension */ 505 gnuism(320); 506 } compound_statement_rbrace T_RPAREN { 507 $$ = build_name(*current_initsym(), 0); 508 end_initialization(); 509 } 510 ; 511 512 comma_opt: /* helper for 'postfix_expression' */ 513 /* empty */ 514 | T_COMMA 515 ; 516 517 /* 518 * The inner part of a GCC statement-expression of the form ({ ... }). 519 * 520 * https://gcc.gnu.org/onlinedocs/gcc/Statement-Exprs.html 521 */ 522 gcc_statement_expr_list: 523 gcc_statement_expr_item 524 | gcc_statement_expr_list gcc_statement_expr_item { 525 $$ = $2; 526 } 527 ; 528 529 gcc_statement_expr_item: 530 declaration_or_error { 531 clear_warning_flags(); 532 $$ = NULL; 533 } 534 | non_expr_statement { 535 $$ = expr_zalloc_tnode(); 536 $$->tn_type = gettyp(VOID); 537 } 538 | expression T_SEMI { 539 if ($1 == NULL) { /* in case of syntax errors */ 540 $$ = expr_zalloc_tnode(); 541 $$->tn_type = gettyp(VOID); 542 } else { 543 /* XXX: do that only on the last name */ 544 if ($1->tn_op == NAME) 545 $1->tn_sym->s_used = true; 546 expr($1, false, false, false, false); 547 seen_fallthrough = false; 548 $$ = $1; 549 } 550 } 551 ; 552 553 point_or_arrow: /* helper for 'postfix_expression' */ 554 T_POINT { 555 symtyp = FMEMBER; 556 $$ = POINT; 557 } 558 | T_ARROW { 559 symtyp = FMEMBER; 560 $$ = ARROW; 561 } 562 ; 563 564 /* K&R 7.1, C90 ???, C99 6.5.2, C11 6.5.2 */ 565 argument_expression_list: 566 assignment_expression { 567 $$ = build_function_argument(NULL, $1); 568 } 569 | argument_expression_list T_COMMA assignment_expression { 570 $$ = build_function_argument($1, $3); 571 } 572 ; 573 574 /* K&R 7.2, C90 ???, C99 6.5.3, C11 6.5.3 */ 575 unary_expression: 576 postfix_expression 577 | T_INCDEC unary_expression { 578 $$ = build_unary($1 == INC ? INCBEF : DECBEF, $2); 579 } 580 | T_AMPER cast_expression { 581 $$ = build_unary(ADDR, $2); 582 } 583 | T_ASTERISK cast_expression { 584 $$ = build_unary(INDIR, $2); 585 } 586 | T_ADDITIVE cast_expression { 587 if (tflag && $1 == PLUS) { 588 /* unary + is illegal in traditional C */ 589 warning(100); 590 } 591 $$ = build_unary($1 == PLUS ? UPLUS : UMINUS, $2); 592 } 593 | T_COMPLEMENT cast_expression { 594 $$ = build_unary(COMPL, $2); 595 } 596 | T_LOGNOT cast_expression { 597 $$ = build_unary(NOT, $2); 598 } 599 | T_REAL cast_expression { /* GCC c_parser_unary_expression */ 600 $$ = build_unary(REAL, $2); 601 } 602 | T_IMAG cast_expression { /* GCC c_parser_unary_expression */ 603 $$ = build_unary(IMAG, $2); 604 } 605 | T_EXTENSION cast_expression { /* GCC c_parser_unary_expression */ 606 $$ = $2; 607 } 608 | T_SIZEOF unary_expression { 609 $$ = $2 == NULL ? NULL : build_sizeof($2->tn_type); 610 if ($$ != NULL) 611 check_expr_misc($2, 612 false, false, false, false, false, true); 613 } 614 | T_SIZEOF T_LPAREN type_name T_RPAREN { 615 $$ = build_sizeof($3); 616 } 617 /* K&R ---, C90 ---, C99 ---, C11 6.5.3 */ 618 | T_ALIGNOF T_LPAREN type_name T_RPAREN { 619 /* TODO: c11ism */ 620 $$ = build_alignof($3); 621 } 622 ; 623 624 /* The rule 'unary_operator' is inlined into unary_expression. */ 625 626 /* K&R 7.2, C90 ???, C99 6.5.4, C11 6.5.4 */ 627 cast_expression: 628 unary_expression 629 | T_LPAREN type_name T_RPAREN cast_expression { 630 $$ = cast($4, $2); 631 } 632 ; 633 634 expression_opt: 635 /* empty */ { 636 $$ = NULL; 637 } 638 | expression 639 ; 640 641 /* 'conditional_expression' also implements 'multiplicative_expression'. */ 642 /* 'conditional_expression' also implements 'additive_expression'. */ 643 /* 'conditional_expression' also implements 'shift_expression'. */ 644 /* 'conditional_expression' also implements 'relational_expression'. */ 645 /* 'conditional_expression' also implements 'equality_expression'. */ 646 /* 'conditional_expression' also implements 'AND_expression'. */ 647 /* 'conditional_expression' also implements 'exclusive_OR_expression'. */ 648 /* 'conditional_expression' also implements 'inclusive_OR_expression'. */ 649 /* 'conditional_expression' also implements 'logical_AND_expression'. */ 650 /* 'conditional_expression' also implements 'logical_OR_expression'. */ 651 /* K&R ???, C90 ???, C99 6.5.5 to 6.5.15, C11 6.5.5 to 6.5.15 */ 652 conditional_expression: 653 conditional_expression T_ASTERISK conditional_expression { 654 $$ = build_binary($1, MULT, $3); 655 } 656 | conditional_expression T_MULTIPLICATIVE conditional_expression { 657 $$ = build_binary($1, $2, $3); 658 } 659 | conditional_expression T_ADDITIVE conditional_expression { 660 $$ = build_binary($1, $2, $3); 661 } 662 | conditional_expression T_SHIFT conditional_expression { 663 $$ = build_binary($1, $2, $3); 664 } 665 | conditional_expression T_RELATIONAL conditional_expression { 666 $$ = build_binary($1, $2, $3); 667 } 668 | conditional_expression T_EQUALITY conditional_expression { 669 $$ = build_binary($1, $2, $3); 670 } 671 | conditional_expression T_AMPER conditional_expression { 672 $$ = build_binary($1, BITAND, $3); 673 } 674 | conditional_expression T_BITXOR conditional_expression { 675 $$ = build_binary($1, BITXOR, $3); 676 } 677 | conditional_expression T_BITOR conditional_expression { 678 $$ = build_binary($1, BITOR, $3); 679 } 680 | conditional_expression T_LOGAND conditional_expression { 681 $$ = build_binary($1, LOGAND, $3); 682 } 683 | conditional_expression T_LOGOR conditional_expression { 684 $$ = build_binary($1, LOGOR, $3); 685 } 686 | conditional_expression T_QUEST conditional_expression 687 T_COLON conditional_expression { 688 $$ = build_binary($1, QUEST, build_binary($3, COLON, $5)); 689 } 690 | cast_expression; 691 692 /* K&R ???, C90 ???, C99 6.5.16, C11 6.5.16 */ 693 assignment_expression: 694 conditional_expression 695 | assignment_expression T_ASSIGN conditional_expression { 696 $$ = build_binary($1, ASSIGN, $3); 697 } 698 | assignment_expression T_OPASSIGN conditional_expression { 699 $$ = build_binary($1, $2, $3); 700 } 701 ; 702 703 /* K&R ???, C90 ???, C99 6.5.17, C11 6.5.17 */ 704 expression: 705 assignment_expression 706 | expression T_COMMA assignment_expression { 707 $$ = build_binary($1, COMMA, $3); 708 } 709 ; 710 711 constant_expr_list_opt: /* helper for gcc_attribute */ 712 /* empty */ 713 | constant_expr_list 714 ; 715 716 constant_expr_list: /* helper for gcc_attribute */ 717 constant_expr 718 | constant_expr_list T_COMMA constant_expr 719 ; 720 721 constant_expr: /* C99 6.6 */ 722 conditional_expression 723 ; 724 725 declaration_or_error: 726 declaration 727 | error T_SEMI 728 ; 729 730 declaration: /* C99 6.7 */ 731 begin_type_declmods end_type T_SEMI { 732 if (dcs->d_scl == TYPEDEF) { 733 /* typedef declares no type name */ 734 warning(72); 735 } else { 736 /* empty declaration */ 737 warning(2); 738 } 739 } 740 | begin_type_declmods end_type notype_init_declarators T_SEMI 741 /* ^^ There is no check for the missing type-specifier. */ 742 | begin_type_declaration_specifiers end_type T_SEMI { 743 if (dcs->d_scl == TYPEDEF) { 744 /* typedef declares no type name */ 745 warning(72); 746 } else if (!dcs->d_nonempty_decl) { 747 /* empty declaration */ 748 warning(2); 749 } 750 } 751 | begin_type_declaration_specifiers end_type 752 type_init_declarators T_SEMI 753 ; 754 755 begin_type_declaration_specifiers: /* see C99 6.7 */ 756 begin_type_typespec { 757 add_type($1); 758 } 759 | begin_type_declmods type_specifier { 760 add_type($2); 761 } 762 | type_attribute begin_type_declaration_specifiers 763 | begin_type_declaration_specifiers declmod 764 | begin_type_declaration_specifiers notype_type_specifier { 765 add_type($2); 766 } 767 ; 768 769 begin_type_declmods: /* see C99 6.7 */ 770 begin_type T_QUAL { 771 add_qualifier($2); 772 } 773 | begin_type T_SCLASS { 774 add_storage_class($2); 775 } 776 | begin_type_declmods declmod 777 ; 778 779 begin_type_specifier_qualifier_list: /* see C11 6.7.2.1 */ 780 begin_type_typespec { 781 add_type($1); 782 } 783 /* TODO: shift/reduce conflict for type_attribute */ 784 | type_attribute begin_type_specifier_qualifier_list 785 | begin_type_qualifier_list type_specifier { 786 add_type($2); 787 } 788 | begin_type_specifier_qualifier_list T_QUAL { 789 add_qualifier($2); 790 } 791 | begin_type_specifier_qualifier_list notype_type_specifier { 792 add_type($2); 793 } 794 | begin_type_specifier_qualifier_list type_attribute 795 ; 796 797 begin_type_typespec: 798 begin_type notype_type_specifier { 799 $$ = $2; 800 } 801 | T_TYPENAME begin_type { 802 $$ = getsym($1)->s_type; 803 } 804 ; 805 806 begin_type_qualifier_list: 807 begin_type T_QUAL { 808 add_qualifier($2); 809 } 810 | begin_type_qualifier_list T_QUAL { 811 add_qualifier($2); 812 } 813 ; 814 815 declmod: 816 T_QUAL { 817 add_qualifier($1); 818 } 819 | T_SCLASS { 820 add_storage_class($1); 821 } 822 | type_attribute_list 823 ; 824 825 type_attribute_list: 826 type_attribute 827 | type_attribute_list type_attribute 828 ; 829 830 type_attribute_opt: 831 /* empty */ 832 | type_attribute 833 ; 834 835 type_attribute: /* See C11 6.7 declaration-specifiers */ 836 gcc_attribute 837 /* TODO: c11ism */ 838 | T_ALIGNAS T_LPAREN align_as T_RPAREN 839 | T_PACKED { 840 addpacked(); 841 } 842 | T_NORETURN 843 ; 844 845 align_as: /* See alignment-specifier in C11 6.7.5 */ 846 type_specifier 847 | constant_expr 848 ; 849 850 begin_type: 851 /* empty */ { 852 begin_type(); 853 } 854 ; 855 856 end_type: 857 /* empty */ { 858 end_type(); 859 } 860 ; 861 862 type_specifier: /* C99 6.7.2 */ 863 notype_type_specifier 864 | T_TYPENAME { 865 $$ = getsym($1)->s_type; 866 } 867 ; 868 869 notype_type_specifier: /* see C99 6.7.2 */ 870 T_TYPE { 871 $$ = gettyp($1); 872 } 873 | T_TYPEOF T_LPAREN expression T_RPAREN { /* GCC extension */ 874 $$ = $3->tn_type; 875 } 876 | struct_or_union_specifier { 877 end_declaration_level(); 878 $$ = $1; 879 } 880 | enum_specifier { 881 end_declaration_level(); 882 $$ = $1; 883 } 884 ; 885 886 struct_or_union_specifier: /* C99 6.7.2.1 */ 887 struct_or_union identifier_sym { 888 /* 889 * STDC requires that "struct a;" always introduces 890 * a new tag if "a" is not declared at current level 891 * 892 * yychar is valid because otherwise the parser would not 893 * have been able to decide if it must shift or reduce 894 */ 895 $$ = mktag($2, $1, false, yychar == T_SEMI); 896 } 897 | struct_or_union identifier_sym { 898 dcs->d_tagtyp = mktag($2, $1, true, false); 899 } braced_struct_declaration_list { 900 $$ = complete_tag_struct_or_union(dcs->d_tagtyp, $4); 901 } 902 | struct_or_union { 903 dcs->d_tagtyp = mktag(NULL, $1, true, false); 904 } braced_struct_declaration_list { 905 $$ = complete_tag_struct_or_union(dcs->d_tagtyp, $3); 906 } 907 | struct_or_union error { 908 symtyp = FVFT; 909 $$ = gettyp(INT); 910 } 911 ; 912 913 struct_or_union: /* C99 6.7.2.1 */ 914 struct_or_union type_attribute 915 | T_STRUCT_OR_UNION { 916 symtyp = FTAG; 917 begin_declaration_level($1 == STRUCT ? MOS : MOU); 918 dcs->d_offset = 0; 919 dcs->d_sou_align_in_bits = CHAR_SIZE; 920 $$ = $1; 921 } 922 ; 923 924 braced_struct_declaration_list: /* see C99 6.7.2.1 */ 925 struct_declaration_lbrace struct_declaration_list_with_rbrace { 926 $$ = $2; 927 } 928 ; 929 930 struct_declaration_lbrace: /* see C99 6.7.2.1 */ 931 T_LBRACE { 932 symtyp = FVFT; 933 } 934 ; 935 936 struct_declaration_list_with_rbrace: /* see C99 6.7.2.1 */ 937 struct_declaration_list T_RBRACE 938 | T_RBRACE { 939 /* XXX: This is not allowed by any C standard. */ 940 $$ = NULL; 941 } 942 ; 943 944 struct_declaration_list: /* C99 6.7.2.1 */ 945 struct_declaration 946 | struct_declaration_list struct_declaration { 947 $$ = lnklst($1, $2); 948 } 949 ; 950 951 struct_declaration: /* C99 6.7.2.1 */ 952 begin_type_qualifier_list end_type { 953 /* ^^ There is no check for the missing type-specifier. */ 954 /* too late, i know, but getsym() compensates it */ 955 symtyp = FMEMBER; 956 } notype_struct_declarators type_attribute_opt T_SEMI { 957 symtyp = FVFT; 958 $$ = $4; 959 } 960 | begin_type_specifier_qualifier_list end_type { 961 symtyp = FMEMBER; 962 } type_struct_declarators type_attribute_opt T_SEMI { 963 symtyp = FVFT; 964 $$ = $4; 965 } 966 | begin_type_qualifier_list end_type type_attribute_opt T_SEMI { 967 /* syntax error '%s' */ 968 error(249, "member without type"); 969 $$ = NULL; 970 } 971 | begin_type_specifier_qualifier_list end_type type_attribute_opt 972 T_SEMI { 973 symtyp = FVFT; 974 if (!Sflag) 975 /* anonymous struct/union members is a C9X feature */ 976 warning(49); 977 if (is_struct_or_union(dcs->d_type->t_tspec)) { 978 $$ = dcs->d_type->t_str->sou_first_member; 979 /* add all the members of the anonymous struct/union */ 980 anonymize($$); 981 } else { 982 /* syntax error '%s' */ 983 error(249, "unnamed member"); 984 $$ = NULL; 985 } 986 } 987 | error T_SEMI { 988 symtyp = FVFT; 989 $$ = NULL; 990 } 991 ; 992 993 notype_struct_declarators: 994 notype_struct_declarator { 995 $$ = declarator_1_struct_union($1); 996 } 997 | notype_struct_declarators { 998 symtyp = FMEMBER; 999 } T_COMMA type_struct_declarator { 1000 $$ = lnklst($1, declarator_1_struct_union($4)); 1001 } 1002 ; 1003 1004 type_struct_declarators: 1005 type_struct_declarator { 1006 $$ = declarator_1_struct_union($1); 1007 } 1008 | type_struct_declarators { 1009 symtyp = FMEMBER; 1010 } T_COMMA type_struct_declarator { 1011 $$ = lnklst($1, declarator_1_struct_union($4)); 1012 } 1013 ; 1014 1015 notype_struct_declarator: 1016 notype_declarator 1017 | notype_declarator T_COLON constant_expr { /* C99 6.7.2.1 */ 1018 $$ = bitfield($1, to_int_constant($3, true)); 1019 } 1020 | { 1021 symtyp = FVFT; 1022 } T_COLON constant_expr { /* C99 6.7.2.1 */ 1023 $$ = bitfield(NULL, to_int_constant($3, true)); 1024 } 1025 ; 1026 1027 type_struct_declarator: 1028 type_declarator 1029 | type_declarator T_COLON constant_expr { 1030 $$ = bitfield($1, to_int_constant($3, true)); 1031 } 1032 | { 1033 symtyp = FVFT; 1034 } T_COLON constant_expr { 1035 $$ = bitfield(NULL, to_int_constant($3, true)); 1036 } 1037 ; 1038 1039 enum_specifier: /* C99 6.7.2.2 */ 1040 enum gcc_attribute_list_opt identifier_sym { 1041 $$ = mktag($3, ENUM, false, false); 1042 } 1043 | enum gcc_attribute_list_opt identifier_sym { 1044 dcs->d_tagtyp = mktag($3, ENUM, true, false); 1045 } enum_declaration /*gcc_attribute_list_opt*/ { 1046 $$ = complete_tag_enum(dcs->d_tagtyp, $5); 1047 } 1048 | enum gcc_attribute_list_opt { 1049 dcs->d_tagtyp = mktag(NULL, ENUM, true, false); 1050 } enum_declaration /*gcc_attribute_list_opt*/ { 1051 $$ = complete_tag_enum(dcs->d_tagtyp, $4); 1052 } 1053 | enum error { 1054 symtyp = FVFT; 1055 $$ = gettyp(INT); 1056 } 1057 ; 1058 1059 enum: /* helper for C99 6.7.2.2 */ 1060 T_ENUM { 1061 symtyp = FTAG; 1062 begin_declaration_level(CTCONST); 1063 } 1064 ; 1065 1066 enum_declaration: /* helper for C99 6.7.2.2 */ 1067 enum_decl_lbrace enums_with_opt_comma T_RBRACE { 1068 $$ = $2; 1069 } 1070 ; 1071 1072 enum_decl_lbrace: /* helper for C99 6.7.2.2 */ 1073 T_LBRACE { 1074 symtyp = FVFT; 1075 enumval = 0; 1076 } 1077 ; 1078 1079 enums_with_opt_comma: /* helper for C99 6.7.2.2 */ 1080 enumerator_list 1081 | enumerator_list T_COMMA { 1082 if (sflag) { 1083 /* trailing ',' prohibited in enum declaration */ 1084 error(54); 1085 } else { 1086 /* trailing ',' prohibited in enum declaration */ 1087 c99ism(54); 1088 } 1089 $$ = $1; 1090 } 1091 ; 1092 1093 enumerator_list: /* C99 6.7.2.2 */ 1094 enumerator 1095 | enumerator_list T_COMMA enumerator { 1096 $$ = lnklst($1, $3); 1097 } 1098 | error { 1099 $$ = NULL; 1100 } 1101 ; 1102 1103 enumerator: /* C99 6.7.2.2 */ 1104 identifier_sym { 1105 $$ = enumeration_constant($1, enumval, true); 1106 } 1107 | identifier_sym T_ASSIGN constant_expr { 1108 $$ = enumeration_constant($1, to_int_constant($3, true), 1109 false); 1110 } 1111 ; 1112 1113 type_qualifier: /* C99 6.7.3 */ 1114 T_QUAL { 1115 $$ = xcalloc(1, sizeof(*$$)); 1116 if ($1 == CONST) 1117 $$->p_const = true; 1118 if ($1 == VOLATILE) 1119 $$->p_volatile = true; 1120 } 1121 ; 1122 1123 pointer: /* C99 6.7.5 */ 1124 asterisk type_qualifier_list_opt { 1125 $$ = merge_qualified_pointer($1, $2); 1126 } 1127 | asterisk type_qualifier_list_opt pointer { 1128 $$ = merge_qualified_pointer($1, $2); 1129 $$ = merge_qualified_pointer($$, $3); 1130 } 1131 ; 1132 1133 asterisk: /* helper for 'pointer' */ 1134 T_ASTERISK { 1135 $$ = xcalloc(1, sizeof(*$$)); 1136 $$->p_pointer = true; 1137 } 1138 ; 1139 1140 type_qualifier_list_opt: /* see C99 6.7.5 */ 1141 /* empty */ { 1142 $$ = NULL; 1143 } 1144 | type_qualifier_list 1145 ; 1146 1147 type_qualifier_list: /* C99 6.7.5 */ 1148 type_qualifier 1149 | type_qualifier_list type_qualifier { 1150 $$ = merge_qualified_pointer($1, $2); 1151 } 1152 ; 1153 1154 /* 1155 * For an explanation of 'notype' in the following rules, see the Bison 1156 * manual, section 7.1 "Semantic Info in Token Kinds". 1157 */ 1158 1159 notype_init_declarators: 1160 notype_init_declarator 1161 | notype_init_declarators T_COMMA type_init_declarator 1162 ; 1163 1164 type_init_declarators: 1165 type_init_declarator 1166 | type_init_declarators T_COMMA type_init_declarator 1167 ; 1168 1169 notype_init_declarator: 1170 notype_declarator asm_or_symbolrename_opt { 1171 cgram_declare($1, false, $2); 1172 check_size($1); 1173 } 1174 | notype_declarator asm_or_symbolrename_opt { 1175 begin_initialization($1); 1176 cgram_declare($1, true, $2); 1177 } T_ASSIGN initializer { 1178 check_size($1); 1179 end_initialization(); 1180 } 1181 ; 1182 1183 type_init_declarator: 1184 type_declarator asm_or_symbolrename_opt { 1185 cgram_declare($1, false, $2); 1186 check_size($1); 1187 } 1188 | type_declarator asm_or_symbolrename_opt { 1189 begin_initialization($1); 1190 cgram_declare($1, true, $2); 1191 } T_ASSIGN initializer { 1192 check_size($1); 1193 end_initialization(); 1194 } 1195 ; 1196 1197 notype_declarator: 1198 notype_direct_declarator 1199 | pointer notype_direct_declarator { 1200 $$ = add_pointer($2, $1); 1201 } 1202 ; 1203 1204 type_declarator: 1205 type_direct_declarator 1206 | pointer type_direct_declarator { 1207 $$ = add_pointer($2, $1); 1208 } 1209 ; 1210 1211 notype_direct_declarator: 1212 T_NAME { 1213 $$ = declarator_name(getsym($1)); 1214 } 1215 | T_LPAREN type_declarator T_RPAREN { 1216 $$ = $2; 1217 } 1218 | type_attribute notype_direct_declarator { 1219 $$ = $2; 1220 } 1221 | notype_direct_declarator T_LBRACK T_RBRACK { 1222 $$ = add_array($1, false, 0); 1223 } 1224 | notype_direct_declarator T_LBRACK array_size T_RBRACK { 1225 $$ = add_array($1, true, to_int_constant($3, false)); 1226 } 1227 | notype_direct_declarator param_list asm_or_symbolrename_opt { 1228 $$ = add_function(symbolrename($1, $3), $2); 1229 end_declaration_level(); 1230 block_level--; 1231 } 1232 | notype_direct_declarator type_attribute 1233 ; 1234 1235 type_direct_declarator: 1236 identifier { 1237 $$ = declarator_name(getsym($1)); 1238 } 1239 | T_LPAREN type_declarator T_RPAREN { 1240 $$ = $2; 1241 } 1242 | type_attribute type_direct_declarator { 1243 $$ = $2; 1244 } 1245 | type_direct_declarator T_LBRACK T_RBRACK { 1246 $$ = add_array($1, false, 0); 1247 } 1248 | type_direct_declarator T_LBRACK array_size T_RBRACK { 1249 $$ = add_array($1, true, to_int_constant($3, false)); 1250 } 1251 | type_direct_declarator param_list asm_or_symbolrename_opt { 1252 $$ = add_function(symbolrename($1, $3), $2); 1253 end_declaration_level(); 1254 block_level--; 1255 } 1256 | type_direct_declarator type_attribute 1257 ; 1258 1259 /* 1260 * The two distinct rules type_param_declarator and notype_param_declarator 1261 * avoid a conflict in argument lists. A typename enclosed in parentheses is 1262 * always treated as a typename, not an argument name. For example, after 1263 * "typedef double a;", the declaration "f(int (a));" is interpreted as 1264 * "f(int (double));", not "f(int a);". 1265 */ 1266 type_param_declarator: 1267 direct_param_declarator 1268 | pointer direct_param_declarator { 1269 $$ = add_pointer($2, $1); 1270 } 1271 ; 1272 1273 notype_param_declarator: 1274 direct_notype_param_declarator 1275 | pointer direct_notype_param_declarator { 1276 $$ = add_pointer($2, $1); 1277 } 1278 ; 1279 1280 direct_param_declarator: 1281 identifier type_attribute_list { 1282 $$ = declarator_name(getsym($1)); 1283 } 1284 | identifier { 1285 $$ = declarator_name(getsym($1)); 1286 } 1287 | T_LPAREN notype_param_declarator T_RPAREN { 1288 $$ = $2; 1289 } 1290 | direct_param_declarator T_LBRACK T_RBRACK { 1291 $$ = add_array($1, false, 0); 1292 } 1293 | direct_param_declarator T_LBRACK array_size T_RBRACK { 1294 $$ = add_array($1, true, to_int_constant($3, false)); 1295 } 1296 | direct_param_declarator param_list asm_or_symbolrename_opt { 1297 $$ = add_function(symbolrename($1, $3), $2); 1298 end_declaration_level(); 1299 block_level--; 1300 } 1301 ; 1302 1303 direct_notype_param_declarator: 1304 identifier { 1305 $$ = declarator_name(getsym($1)); 1306 } 1307 | T_LPAREN notype_param_declarator T_RPAREN { 1308 $$ = $2; 1309 } 1310 | direct_notype_param_declarator T_LBRACK T_RBRACK { 1311 $$ = add_array($1, false, 0); 1312 } 1313 | direct_notype_param_declarator T_LBRACK array_size T_RBRACK { 1314 $$ = add_array($1, true, to_int_constant($3, false)); 1315 } 1316 | direct_notype_param_declarator param_list asm_or_symbolrename_opt { 1317 $$ = add_function(symbolrename($1, $3), $2); 1318 end_declaration_level(); 1319 block_level--; 1320 } 1321 ; 1322 1323 param_list: 1324 id_list_lparen identifier_list T_RPAREN { 1325 $$ = $2; 1326 } 1327 | abstract_decl_param_list 1328 ; 1329 1330 id_list_lparen: 1331 T_LPAREN { 1332 block_level++; 1333 begin_declaration_level(PROTO_ARG); 1334 } 1335 ; 1336 1337 array_size: 1338 type_qualifier_list_opt T_SCLASS constant_expr { 1339 /* C11 6.7.6.3p7 */ 1340 if ($2 != STATIC) 1341 yyerror("Bad attribute"); 1342 /* static array size is a C11 extension */ 1343 c11ism(343); 1344 $$ = $3; 1345 } 1346 | constant_expr 1347 ; 1348 1349 identifier_list: /* C99 6.7.5 */ 1350 T_NAME { 1351 $$ = old_style_function_name(getsym($1)); 1352 } 1353 | identifier_list T_COMMA T_NAME { 1354 $$ = lnklst($1, old_style_function_name(getsym($3))); 1355 } 1356 | identifier_list error 1357 ; 1358 1359 /* XXX: C99 requires an additional specifier-qualifier-list. */ 1360 type_name: /* C99 6.7.6 */ 1361 { 1362 begin_declaration_level(ABSTRACT); 1363 } abstract_declaration { 1364 end_declaration_level(); 1365 $$ = $2->s_type; 1366 } 1367 ; 1368 1369 abstract_declaration: /* specific to lint */ 1370 begin_type_qualifier_list end_type { 1371 $$ = declare_1_abstract(abstract_name()); 1372 } 1373 | begin_type_specifier_qualifier_list end_type { 1374 $$ = declare_1_abstract(abstract_name()); 1375 } 1376 | begin_type_qualifier_list end_type abstract_declarator { 1377 $$ = declare_1_abstract($3); 1378 } 1379 | begin_type_specifier_qualifier_list end_type abstract_declarator { 1380 $$ = declare_1_abstract($3); 1381 } 1382 ; 1383 1384 /* K&R 8.7, C90 ???, C99 6.7.6, C11 6.7.7 */ 1385 /* In K&R, abstract-declarator could be empty and was still simpler. */ 1386 abstract_declarator: 1387 pointer { 1388 $$ = add_pointer(abstract_name(), $1); 1389 } 1390 | direct_abstract_declarator 1391 | pointer direct_abstract_declarator { 1392 $$ = add_pointer($2, $1); 1393 } 1394 ; 1395 1396 /* K&R ---, C90 ???, C99 6.7.6, C11 6.7.7 */ 1397 direct_abstract_declarator: 1398 T_LPAREN abstract_declarator T_RPAREN { 1399 $$ = $2; 1400 } 1401 | T_LBRACK T_RBRACK { 1402 $$ = add_array(abstract_name(), false, 0); 1403 } 1404 | T_LBRACK array_size T_RBRACK { 1405 $$ = add_array(abstract_name(), true, 1406 to_int_constant($2, false)); 1407 } 1408 | type_attribute direct_abstract_declarator { 1409 $$ = $2; 1410 } 1411 | direct_abstract_declarator T_LBRACK T_RBRACK { 1412 $$ = add_array($1, false, 0); 1413 } 1414 | direct_abstract_declarator T_LBRACK T_ASTERISK T_RBRACK { /* C99 */ 1415 $$ = add_array($1, false, 0); 1416 } 1417 | direct_abstract_declarator T_LBRACK array_size T_RBRACK { 1418 $$ = add_array($1, true, to_int_constant($3, false)); 1419 } 1420 | abstract_decl_param_list asm_or_symbolrename_opt { 1421 $$ = add_function(symbolrename(abstract_name(), $2), $1); 1422 end_declaration_level(); 1423 block_level--; 1424 } 1425 | direct_abstract_declarator abstract_decl_param_list 1426 asm_or_symbolrename_opt { 1427 $$ = add_function(symbolrename($1, $3), $2); 1428 end_declaration_level(); 1429 block_level--; 1430 } 1431 | direct_abstract_declarator type_attribute_list 1432 ; 1433 1434 abstract_decl_param_list: /* specific to lint */ 1435 abstract_decl_lparen T_RPAREN type_attribute_opt { 1436 $$ = NULL; 1437 } 1438 | abstract_decl_lparen vararg_parameter_type_list T_RPAREN 1439 type_attribute_opt { 1440 dcs->d_proto = true; 1441 $$ = $2; 1442 } 1443 | abstract_decl_lparen error T_RPAREN type_attribute_opt { 1444 $$ = NULL; 1445 } 1446 ; 1447 1448 abstract_decl_lparen: /* specific to lint */ 1449 T_LPAREN { 1450 block_level++; 1451 begin_declaration_level(PROTO_ARG); 1452 } 1453 ; 1454 1455 vararg_parameter_type_list: /* specific to lint */ 1456 parameter_type_list 1457 | parameter_type_list T_COMMA T_ELLIPSIS { 1458 dcs->d_vararg = true; 1459 $$ = $1; 1460 } 1461 | T_ELLIPSIS { 1462 if (sflag) { 1463 /* ANSI C requires formal parameter before '...' */ 1464 error(84); 1465 } else if (!tflag) { 1466 /* ANSI C requires formal parameter before '...' */ 1467 warning(84); 1468 } 1469 dcs->d_vararg = true; 1470 $$ = NULL; 1471 } 1472 ; 1473 1474 /* XXX: C99 6.7.5 defines the same name, but it looks different. */ 1475 parameter_type_list: 1476 parameter_declaration 1477 | parameter_type_list T_COMMA parameter_declaration { 1478 $$ = lnklst($1, $3); 1479 } 1480 ; 1481 1482 /* XXX: C99 6.7.5 defines the same name, but it looks completely different. */ 1483 parameter_declaration: 1484 begin_type_declmods end_type { 1485 /* ^^ There is no check for the missing type-specifier. */ 1486 $$ = declare_argument(abstract_name(), false); 1487 } 1488 | begin_type_declaration_specifiers end_type { 1489 $$ = declare_argument(abstract_name(), false); 1490 } 1491 | begin_type_declmods end_type notype_param_declarator { 1492 /* ^^ There is no check for the missing type-specifier. */ 1493 $$ = declare_argument($3, false); 1494 } 1495 /* 1496 * type_param_declarator is needed because of following conflict: 1497 * "typedef int a; f(int (a));" could be parsed as 1498 * "function with argument a of type int", or 1499 * "function with an abstract argument of type function". 1500 * This grammar realizes the second case. 1501 */ 1502 | begin_type_declaration_specifiers end_type type_param_declarator { 1503 $$ = declare_argument($3, false); 1504 } 1505 | begin_type_declmods end_type abstract_declarator { 1506 /* ^^ There is no check for the missing type-specifier. */ 1507 $$ = declare_argument($3, false); 1508 } 1509 | begin_type_declaration_specifiers end_type abstract_declarator { 1510 $$ = declare_argument($3, false); 1511 } 1512 ; 1513 1514 initializer: /* C99 6.7.8 "Initialization" */ 1515 assignment_expression { 1516 init_expr($1); 1517 } 1518 | init_lbrace init_rbrace { 1519 /* XXX: Empty braces are not covered by C99 6.7.8. */ 1520 } 1521 | init_lbrace initializer_list comma_opt init_rbrace 1522 /* XXX: What is this error handling for? */ 1523 | error 1524 ; 1525 1526 initializer_list: /* C99 6.7.8 "Initialization" */ 1527 initializer_list_item 1528 | initializer_list T_COMMA initializer_list_item 1529 ; 1530 1531 initializer_list_item: /* helper */ 1532 designation initializer 1533 | initializer 1534 ; 1535 1536 designation: /* C99 6.7.8 "Initialization" */ 1537 designator_list T_ASSIGN 1538 | identifier T_COLON { 1539 /* GCC style struct or union member name in initializer */ 1540 gnuism(315); 1541 add_designator_member($1); 1542 } 1543 ; 1544 1545 designator_list: /* C99 6.7.8 "Initialization" */ 1546 designator 1547 | designator_list designator 1548 ; 1549 1550 designator: /* C99 6.7.8 "Initialization" */ 1551 T_LBRACK range T_RBRACK { 1552 add_designator_subscript($2); 1553 if (!Sflag) 1554 /* array initializer with des.s is a C9X feature */ 1555 warning(321); 1556 } 1557 | T_POINT identifier { 1558 if (!Sflag) 1559 /* struct or union member name in initializer is ... */ 1560 warning(313); 1561 add_designator_member($2); 1562 } 1563 ; 1564 1565 range: 1566 constant_expr { 1567 $$.lo = to_int_constant($1, true); 1568 $$.hi = $$.lo; 1569 } 1570 | constant_expr T_ELLIPSIS constant_expr { 1571 $$.lo = to_int_constant($1, true); 1572 $$.hi = to_int_constant($3, true); 1573 /* initialization with '[a...b]' is a GCC extension */ 1574 gnuism(340); 1575 } 1576 ; 1577 1578 init_lbrace: /* helper */ 1579 T_LBRACE { 1580 init_lbrace(); 1581 } 1582 ; 1583 1584 init_rbrace: /* helper */ 1585 T_RBRACE { 1586 init_rbrace(); 1587 } 1588 ; 1589 1590 asm_or_symbolrename_opt: /* GCC extensions */ 1591 /* empty */ { 1592 $$ = NULL; 1593 } 1594 | T_ASM T_LPAREN T_STRING T_RPAREN gcc_attribute_list_opt { 1595 freeyyv(&$3, T_STRING); 1596 $$ = NULL; 1597 } 1598 | T_SYMBOLRENAME T_LPAREN T_NAME T_RPAREN gcc_attribute_list_opt { 1599 $$ = $3; 1600 } 1601 ; 1602 1603 statement: /* C99 6.8 */ 1604 expression_statement 1605 | non_expr_statement 1606 ; 1607 1608 non_expr_statement: /* helper for C99 6.8 */ 1609 type_attribute T_SEMI 1610 | labeled_statement 1611 | compound_statement 1612 | selection_statement 1613 | iteration_statement 1614 | jump_statement { 1615 seen_fallthrough = false; 1616 } 1617 | asm_statement 1618 ; 1619 1620 labeled_statement: /* C99 6.8.1 */ 1621 label type_attribute_opt statement 1622 ; 1623 1624 label: 1625 T_NAME T_COLON { 1626 symtyp = FLABEL; 1627 named_label(getsym($1)); 1628 } 1629 | T_CASE constant_expr T_COLON { 1630 case_label($2); 1631 seen_fallthrough = true; 1632 } 1633 | T_CASE constant_expr T_ELLIPSIS constant_expr T_COLON { 1634 /* XXX: We don't fill all cases */ 1635 case_label($2); 1636 seen_fallthrough = true; 1637 } 1638 | T_DEFAULT T_COLON { 1639 default_label(); 1640 seen_fallthrough = true; 1641 } 1642 ; 1643 1644 compound_statement: /* C99 6.8.2 */ 1645 compound_statement_lbrace compound_statement_rbrace 1646 | compound_statement_lbrace block_item_list compound_statement_rbrace 1647 ; 1648 1649 compound_statement_lbrace: 1650 T_LBRACE { 1651 block_level++; 1652 mem_block_level++; 1653 begin_declaration_level(AUTO); 1654 } 1655 ; 1656 1657 compound_statement_rbrace: 1658 T_RBRACE { 1659 end_declaration_level(); 1660 freeblk(); 1661 mem_block_level--; 1662 block_level--; 1663 seen_fallthrough = false; 1664 } 1665 ; 1666 1667 block_item_list: /* C99 6.8.2 */ 1668 block_item 1669 | block_item_list block_item { 1670 if (!Sflag && $1 && !$2) 1671 /* declarations after statements is a C99 feature */ 1672 c99ism(327); 1673 $$ = $1 || $2; 1674 } 1675 ; 1676 1677 block_item: /* C99 6.8.2 */ 1678 declaration_or_error { 1679 $$ = false; 1680 restore_warning_flags(); 1681 } 1682 | statement { 1683 $$ = true; 1684 restore_warning_flags(); 1685 } 1686 ; 1687 1688 expression_statement: /* C99 6.8.3 */ 1689 expression T_SEMI { 1690 expr($1, false, false, false, false); 1691 seen_fallthrough = false; 1692 } 1693 | T_SEMI { 1694 seen_fallthrough = false; 1695 } 1696 ; 1697 1698 selection_statement: /* C99 6.8.4 */ 1699 if_without_else %prec T_THEN { 1700 save_warning_flags(); 1701 if2(); 1702 if3(false); 1703 } 1704 | if_without_else T_ELSE { 1705 save_warning_flags(); 1706 if2(); 1707 } statement { 1708 clear_warning_flags(); 1709 if3(true); 1710 } 1711 | if_without_else T_ELSE error { 1712 clear_warning_flags(); 1713 if3(false); 1714 } 1715 | switch_expr statement { 1716 clear_warning_flags(); 1717 switch2(); 1718 } 1719 | switch_expr error { 1720 clear_warning_flags(); 1721 switch2(); 1722 } 1723 ; 1724 1725 if_without_else: /* see C99 6.8.4 */ 1726 if_expr statement 1727 | if_expr error 1728 ; 1729 1730 if_expr: /* see C99 6.8.4 */ 1731 T_IF T_LPAREN expression T_RPAREN { 1732 if1($3); 1733 clear_warning_flags(); 1734 } 1735 ; 1736 1737 switch_expr: /* see C99 6.8.4 */ 1738 T_SWITCH T_LPAREN expression T_RPAREN { 1739 switch1($3); 1740 clear_warning_flags(); 1741 } 1742 ; 1743 1744 iteration_statement: /* C99 6.8.5 */ 1745 while_expr statement { 1746 clear_warning_flags(); 1747 while2(); 1748 } 1749 | while_expr error { 1750 clear_warning_flags(); 1751 while2(); 1752 } 1753 | do_statement do_while_expr { 1754 do2($2); 1755 seen_fallthrough = false; 1756 } 1757 | do error { 1758 clear_warning_flags(); 1759 do2(NULL); 1760 } 1761 | for_exprs statement { 1762 clear_warning_flags(); 1763 for2(); 1764 end_declaration_level(); 1765 block_level--; 1766 } 1767 | for_exprs error { 1768 clear_warning_flags(); 1769 for2(); 1770 end_declaration_level(); 1771 block_level--; 1772 } 1773 ; 1774 1775 while_expr: /* see C99 6.8.5 */ 1776 T_WHILE T_LPAREN expression T_RPAREN { 1777 while1($3); 1778 clear_warning_flags(); 1779 } 1780 ; 1781 1782 do_statement: /* see C99 6.8.5 */ 1783 do statement { 1784 clear_warning_flags(); 1785 } 1786 ; 1787 1788 do: /* see C99 6.8.5 */ 1789 T_DO { 1790 do1(); 1791 } 1792 ; 1793 1794 do_while_expr: /* see C99 6.8.5 */ 1795 T_WHILE T_LPAREN expression T_RPAREN T_SEMI { 1796 $$ = $3; 1797 } 1798 ; 1799 1800 for_start: /* see C99 6.8.5 */ 1801 T_FOR T_LPAREN { 1802 begin_declaration_level(AUTO); 1803 block_level++; 1804 } 1805 ; 1806 1807 for_exprs: /* see C99 6.8.5 */ 1808 for_start 1809 begin_type_declaration_specifiers end_type 1810 notype_init_declarators T_SEMI 1811 expression_opt T_SEMI expression_opt T_RPAREN { 1812 /* variable declaration in for loop */ 1813 c99ism(325); 1814 for1(NULL, $6, $8); 1815 clear_warning_flags(); 1816 } 1817 | for_start 1818 expression_opt T_SEMI 1819 expression_opt T_SEMI 1820 expression_opt T_RPAREN { 1821 for1($2, $4, $6); 1822 clear_warning_flags(); 1823 } 1824 ; 1825 1826 jump_statement: /* C99 6.8.6 */ 1827 goto identifier T_SEMI { 1828 do_goto(getsym($2)); 1829 } 1830 | goto error T_SEMI { 1831 symtyp = FVFT; 1832 } 1833 | T_CONTINUE T_SEMI { 1834 do_continue(); 1835 } 1836 | T_BREAK T_SEMI { 1837 do_break(); 1838 } 1839 | T_RETURN T_SEMI { 1840 do_return(NULL); 1841 } 1842 | T_RETURN expression T_SEMI { 1843 do_return($2); 1844 } 1845 ; 1846 1847 goto: /* see C99 6.8.6 */ 1848 T_GOTO { 1849 symtyp = FLABEL; 1850 } 1851 ; 1852 1853 asm_statement: /* GCC extension */ 1854 T_ASM T_LPAREN read_until_rparen T_SEMI { 1855 setasm(); 1856 } 1857 | T_ASM T_QUAL T_LPAREN read_until_rparen T_SEMI { 1858 setasm(); 1859 } 1860 | T_ASM error 1861 ; 1862 1863 read_until_rparen: /* helper for 'asm_statement' */ 1864 /* empty */ { 1865 read_until_rparen(); 1866 } 1867 ; 1868 1869 translation_unit: /* C99 6.9 */ 1870 external_declaration 1871 | translation_unit external_declaration 1872 ; 1873 1874 external_declaration: /* C99 6.9 */ 1875 function_definition { 1876 global_clean_up_decl(false); 1877 clear_warning_flags(); 1878 } 1879 | top_level_declaration { 1880 global_clean_up_decl(false); 1881 clear_warning_flags(); 1882 } 1883 | asm_statement /* GCC extension */ 1884 | T_SEMI { /* GCC extension */ 1885 if (sflag) { 1886 /* empty declaration */ 1887 error(0); 1888 } else if (!tflag) { 1889 /* empty declaration */ 1890 warning(0); 1891 } 1892 } 1893 ; 1894 1895 /* 1896 * On the top level, lint allows several forms of declarations that it doesn't 1897 * allow in functions. For example, a single ';' is an empty declaration and 1898 * is supported by some compilers, but in a function it would be an empty 1899 * statement, not a declaration. This makes a difference in C90 mode, where 1900 * a statement must not be followed by a declaration. 1901 * 1902 * See 'declaration' for all other declarations. 1903 */ 1904 top_level_declaration: /* C99 6.9 calls this 'declaration' */ 1905 begin_type end_type notype_init_declarators T_SEMI { 1906 if (sflag) { 1907 /* old style declaration; add 'int' */ 1908 error(1); 1909 } else if (!tflag) { 1910 /* old style declaration; add 'int' */ 1911 warning(1); 1912 } 1913 } 1914 | declaration 1915 | error T_SEMI { 1916 global_clean_up(); 1917 } 1918 | error T_RBRACE { 1919 global_clean_up(); 1920 } 1921 ; 1922 1923 function_definition: /* C99 6.9.1 */ 1924 func_declarator { 1925 if ($1->s_type->t_tspec != FUNC) { 1926 /* syntax error '%s' */ 1927 error(249, yytext); 1928 YYERROR; 1929 } 1930 if ($1->s_type->t_typedef) { 1931 /* ()-less function definition */ 1932 error(64); 1933 YYERROR; 1934 } 1935 funcdef($1); 1936 block_level++; 1937 begin_declaration_level(ARG); 1938 if (lwarn == LWARN_NONE) 1939 $1->s_used = true; 1940 } arg_declaration_list_opt { 1941 end_declaration_level(); 1942 block_level--; 1943 check_func_lint_directives(); 1944 check_func_old_style_arguments(); 1945 begin_control_statement(CS_FUNCTION_BODY); 1946 } compound_statement { 1947 funcend(); 1948 end_control_statement(CS_FUNCTION_BODY); 1949 } 1950 ; 1951 1952 func_declarator: 1953 begin_type end_type notype_declarator { 1954 /* ^^ There is no check for the missing type-specifier. */ 1955 $$ = $3; 1956 } 1957 | begin_type_declmods end_type notype_declarator { 1958 /* ^^ There is no check for the missing type-specifier. */ 1959 $$ = $3; 1960 } 1961 | begin_type_declaration_specifiers end_type type_declarator { 1962 $$ = $3; 1963 } 1964 ; 1965 1966 arg_declaration_list_opt: /* C99 6.9.1p13 example 1 */ 1967 /* empty */ 1968 | arg_declaration_list 1969 ; 1970 1971 arg_declaration_list: /* C99 6.9.1p13 example 1 */ 1972 arg_declaration 1973 | arg_declaration_list arg_declaration 1974 /* XXX or better "arg_declaration error" ? */ 1975 | error 1976 ; 1977 1978 /* 1979 * "arg_declaration" is separated from "declaration" because it 1980 * needs other error handling. 1981 */ 1982 arg_declaration: 1983 begin_type_declmods end_type T_SEMI { 1984 /* empty declaration */ 1985 warning(2); 1986 } 1987 | begin_type_declmods end_type notype_init_declarators T_SEMI 1988 | begin_type_declaration_specifiers end_type T_SEMI { 1989 if (!dcs->d_nonempty_decl) { 1990 /* empty declaration */ 1991 warning(2); 1992 } else { 1993 /* '%s' declared in argument declaration list */ 1994 warning(3, type_name(dcs->d_type)); 1995 } 1996 } 1997 | begin_type_declaration_specifiers end_type 1998 type_init_declarators T_SEMI { 1999 if (dcs->d_nonempty_decl) { 2000 /* '%s' declared in argument declaration list */ 2001 warning(3, type_name(dcs->d_type)); 2002 } 2003 } 2004 | begin_type_declmods error 2005 | begin_type_declaration_specifiers error 2006 ; 2007 2008 gcc_attribute_list_opt: 2009 /* empty */ 2010 | gcc_attribute_list 2011 ; 2012 2013 gcc_attribute_list: 2014 gcc_attribute 2015 | gcc_attribute_list gcc_attribute 2016 ; 2017 2018 gcc_attribute: 2019 T_ATTRIBUTE T_LPAREN T_LPAREN { 2020 attron = true; 2021 } gcc_attribute_spec_list { 2022 attron = false; 2023 } T_RPAREN T_RPAREN 2024 ; 2025 2026 gcc_attribute_spec_list: 2027 gcc_attribute_spec 2028 | gcc_attribute_spec_list T_COMMA gcc_attribute_spec 2029 ; 2030 2031 gcc_attribute_spec: 2032 /* empty */ 2033 | T_AT_ALWAYS_INLINE 2034 | T_AT_ALIAS T_LPAREN string T_RPAREN 2035 | T_AT_ALIGNED T_LPAREN constant_expr T_RPAREN 2036 | T_AT_ALIGNED 2037 | T_AT_ALLOC_SIZE T_LPAREN constant_expr T_COMMA constant_expr T_RPAREN 2038 | T_AT_ALLOC_SIZE T_LPAREN constant_expr T_RPAREN 2039 | T_AT_BOUNDED T_LPAREN gcc_attribute_bounded 2040 T_COMMA constant_expr T_COMMA constant_expr T_RPAREN 2041 | T_AT_COLD 2042 | T_AT_COMMON 2043 | T_AT_CONSTRUCTOR T_LPAREN constant_expr T_RPAREN 2044 | T_AT_CONSTRUCTOR 2045 | T_AT_DEPRECATED T_LPAREN string T_RPAREN 2046 | T_AT_DEPRECATED 2047 | T_AT_DESTRUCTOR T_LPAREN constant_expr T_RPAREN 2048 | T_AT_DESTRUCTOR 2049 | T_AT_FALLTHROUGH { 2050 fallthru(1); 2051 } 2052 | T_AT_FORMAT T_LPAREN gcc_attribute_format T_COMMA 2053 constant_expr T_COMMA constant_expr T_RPAREN 2054 | T_AT_FORMAT_ARG T_LPAREN constant_expr T_RPAREN 2055 | T_AT_GNU_INLINE 2056 | T_AT_HOT 2057 | T_AT_MALLOC 2058 | T_AT_MAY_ALIAS 2059 | T_AT_MODE T_LPAREN T_NAME T_RPAREN 2060 | T_AT_NOINLINE 2061 | T_AT_NONNULL T_LPAREN constant_expr_list_opt T_RPAREN 2062 | T_AT_NONNULL 2063 | T_AT_NONSTRING 2064 | T_AT_NORETURN 2065 | T_AT_NOTHROW 2066 | T_AT_NO_INSTRUMENT_FUNCTION 2067 | T_AT_OPTIMIZE T_LPAREN string T_RPAREN 2068 | T_AT_PACKED { 2069 addpacked(); 2070 } 2071 | T_AT_PCS T_LPAREN string T_RPAREN 2072 | T_AT_PURE 2073 | T_AT_RETURNS_TWICE 2074 | T_AT_SECTION T_LPAREN string T_RPAREN 2075 | T_AT_SENTINEL T_LPAREN constant_expr T_RPAREN 2076 | T_AT_SENTINEL 2077 | T_AT_TLS_MODEL T_LPAREN string T_RPAREN 2078 | T_AT_TUNION 2079 | T_AT_UNUSED { 2080 add_attr_used(); 2081 } 2082 | T_AT_USED { 2083 add_attr_used(); 2084 } 2085 | T_AT_VISIBILITY T_LPAREN constant_expr T_RPAREN 2086 | T_AT_WARN_UNUSED_RESULT 2087 | T_AT_WEAK 2088 | T_QUAL { 2089 if ($1 != CONST) 2090 yyerror("Bad attribute"); 2091 } 2092 ; 2093 2094 gcc_attribute_bounded: 2095 T_AT_MINBYTES 2096 | T_AT_STRING 2097 | T_AT_BUFFER 2098 ; 2099 2100 gcc_attribute_format: 2101 T_AT_FORMAT_GNU_PRINTF 2102 | T_AT_FORMAT_PRINTF 2103 | T_AT_FORMAT_SCANF 2104 | T_AT_FORMAT_STRFMON 2105 | T_AT_FORMAT_STRFTIME 2106 | T_AT_FORMAT_SYSLOG 2107 ; 2108 2109 %% 2110 2111 /* ARGSUSED */ 2112 int 2113 yyerror(const char *msg) 2114 { 2115 /* syntax error '%s' */ 2116 error(249, yytext); 2117 if (++sytxerr >= 5) 2118 norecover(); 2119 return 0; 2120 } 2121 2122 static void 2123 cgram_declare(sym_t *decl, bool initflg, sbuf_t *renaming) 2124 { 2125 declare(decl, initflg, renaming); 2126 if (renaming != NULL) 2127 freeyyv(&renaming, T_NAME); 2128 } 2129 2130 /* 2131 * Discard all input tokens up to and including the next 2132 * unmatched right paren 2133 */ 2134 static void 2135 read_until_rparen(void) 2136 { 2137 int level; 2138 2139 if (yychar < 0) 2140 yychar = yylex(); 2141 freeyyv(&yylval, yychar); 2142 2143 level = 1; 2144 while (yychar != T_RPAREN || --level > 0) { 2145 if (yychar == T_LPAREN) { 2146 level++; 2147 } else if (yychar <= 0) { 2148 break; 2149 } 2150 freeyyv(&yylval, yychar = yylex()); 2151 } 2152 2153 yyclearin; 2154 } 2155 2156 static sym_t * 2157 symbolrename(sym_t *s, sbuf_t *sb) 2158 { 2159 if (sb != NULL) 2160 s->s_rename = sb->sb_name; 2161 return s; 2162 } 2163
Indexes created Fri Oct 03 02:09:57 GMT 2025