cgram.y revision 1.337
1 %{ 2 /* $NetBSD: cgram.y,v 1.337 2021/07/25 15:58:24 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 1.337 2021/07/25 15:58:24 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 156 128 129 %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, false, false, false, false, false, true); 612 } 613 | T_SIZEOF T_LPAREN type_name T_RPAREN { 614 $$ = build_sizeof($3); 615 } 616 /* K&R ---, C90 ---, C99 ---, C11 6.5.3 */ 617 | T_ALIGNOF T_LPAREN type_name T_RPAREN { 618 /* TODO: c11ism */ 619 $$ = build_alignof($3); 620 } 621 ; 622 623 /* The rule 'unary_operator' is inlined into unary_expression. */ 624 625 /* K&R 7.2, C90 ???, C99 6.5.4, C11 6.5.4 */ 626 cast_expression: 627 unary_expression 628 | T_LPAREN type_name T_RPAREN cast_expression { 629 $$ = cast($4, $2); 630 } 631 ; 632 633 expression_opt: 634 /* empty */ { 635 $$ = NULL; 636 } 637 | expression 638 ; 639 640 /* 'conditional_expression' also implements 'multiplicative_expression'. */ 641 /* 'conditional_expression' also implements 'additive_expression'. */ 642 /* 'conditional_expression' also implements 'shift_expression'. */ 643 /* 'conditional_expression' also implements 'relational_expression'. */ 644 /* 'conditional_expression' also implements 'equality_expression'. */ 645 /* 'conditional_expression' also implements 'AND_expression'. */ 646 /* 'conditional_expression' also implements 'exclusive_OR_expression'. */ 647 /* 'conditional_expression' also implements 'inclusive_OR_expression'. */ 648 /* 'conditional_expression' also implements 'logical_AND_expression'. */ 649 /* 'conditional_expression' also implements 'logical_OR_expression'. */ 650 /* K&R ???, C90 ???, C99 6.5.5 to 6.5.15, C11 6.5.5 to 6.5.15 */ 651 conditional_expression: 652 conditional_expression T_ASTERISK conditional_expression { 653 $$ = build_binary($1, MULT, $3); 654 } 655 | conditional_expression T_MULTIPLICATIVE conditional_expression { 656 $$ = build_binary($1, $2, $3); 657 } 658 | conditional_expression T_ADDITIVE conditional_expression { 659 $$ = build_binary($1, $2, $3); 660 } 661 | conditional_expression T_SHIFT conditional_expression { 662 $$ = build_binary($1, $2, $3); 663 } 664 | conditional_expression T_RELATIONAL conditional_expression { 665 $$ = build_binary($1, $2, $3); 666 } 667 | conditional_expression T_EQUALITY conditional_expression { 668 $$ = build_binary($1, $2, $3); 669 } 670 | conditional_expression T_AMPER conditional_expression { 671 $$ = build_binary($1, BITAND, $3); 672 } 673 | conditional_expression T_BITXOR conditional_expression { 674 $$ = build_binary($1, BITXOR, $3); 675 } 676 | conditional_expression T_BITOR conditional_expression { 677 $$ = build_binary($1, BITOR, $3); 678 } 679 | conditional_expression T_LOGAND conditional_expression { 680 $$ = build_binary($1, LOGAND, $3); 681 } 682 | conditional_expression T_LOGOR conditional_expression { 683 $$ = build_binary($1, LOGOR, $3); 684 } 685 | conditional_expression T_QUEST conditional_expression 686 T_COLON conditional_expression { 687 $$ = build_binary($1, QUEST, build_binary($3, COLON, $5)); 688 } 689 | cast_expression; 690 691 /* K&R ???, C90 ???, C99 6.5.16, C11 6.5.16 */ 692 assignment_expression: 693 conditional_expression 694 | assignment_expression T_ASSIGN conditional_expression { 695 $$ = build_binary($1, ASSIGN, $3); 696 } 697 | assignment_expression T_OPASSIGN conditional_expression { 698 $$ = build_binary($1, $2, $3); 699 } 700 ; 701 702 /* K&R ???, C90 ???, C99 6.5.17, C11 6.5.17 */ 703 expression: 704 assignment_expression 705 | expression T_COMMA assignment_expression { 706 $$ = build_binary($1, COMMA, $3); 707 } 708 ; 709 710 constant_expr_list_opt: /* helper for gcc_attribute */ 711 /* empty */ 712 | constant_expr_list 713 ; 714 715 constant_expr_list: /* helper for gcc_attribute */ 716 constant_expr 717 | constant_expr_list T_COMMA constant_expr 718 ; 719 720 constant_expr: /* C99 6.6 */ 721 conditional_expression 722 ; 723 724 declaration_or_error: 725 declaration 726 | error T_SEMI 727 ; 728 729 declaration: /* C99 6.7 */ 730 begin_type_declmods end_type T_SEMI { 731 if (dcs->d_scl == TYPEDEF) { 732 /* typedef declares no type name */ 733 warning(72); 734 } else { 735 /* empty declaration */ 736 warning(2); 737 } 738 } 739 | begin_type_declmods end_type notype_init_declarators T_SEMI 740 /* ^^ There is no check for the missing type-specifier. */ 741 | begin_type_declaration_specifiers end_type T_SEMI { 742 if (dcs->d_scl == TYPEDEF) { 743 /* typedef declares no type name */ 744 warning(72); 745 } else if (!dcs->d_nonempty_decl) { 746 /* empty declaration */ 747 warning(2); 748 } 749 } 750 | begin_type_declaration_specifiers end_type 751 type_init_declarators T_SEMI 752 ; 753 754 begin_type_declaration_specifiers: /* see C99 6.7 */ 755 begin_type_typespec { 756 add_type($1); 757 } 758 | begin_type_declmods type_specifier { 759 add_type($2); 760 } 761 | type_attribute begin_type_declaration_specifiers 762 | begin_type_declaration_specifiers declmod 763 | begin_type_declaration_specifiers notype_type_specifier { 764 add_type($2); 765 } 766 ; 767 768 begin_type_declmods: /* see C99 6.7 */ 769 begin_type T_QUAL { 770 add_qualifier($2); 771 } 772 | begin_type T_SCLASS { 773 add_storage_class($2); 774 } 775 | begin_type_declmods declmod 776 ; 777 778 begin_type_specifier_qualifier_list: /* see C11 6.7.2.1 */ 779 begin_type_typespec { 780 add_type($1); 781 } 782 /* TODO: shift/reduce conflict for type_attribute */ 783 | type_attribute begin_type_specifier_qualifier_list 784 | begin_type_qualifier_list type_specifier { 785 add_type($2); 786 } 787 | begin_type_specifier_qualifier_list T_QUAL { 788 add_qualifier($2); 789 } 790 | begin_type_specifier_qualifier_list notype_type_specifier { 791 add_type($2); 792 } 793 | begin_type_specifier_qualifier_list type_attribute 794 ; 795 796 begin_type_typespec: 797 begin_type notype_type_specifier { 798 $$ = $2; 799 } 800 | T_TYPENAME begin_type { 801 $$ = getsym($1)->s_type; 802 } 803 ; 804 805 begin_type_qualifier_list: 806 begin_type T_QUAL { 807 add_qualifier($2); 808 } 809 | begin_type_qualifier_list T_QUAL { 810 add_qualifier($2); 811 } 812 ; 813 814 declmod: 815 T_QUAL { 816 add_qualifier($1); 817 } 818 | T_SCLASS { 819 add_storage_class($1); 820 } 821 | type_attribute_list 822 ; 823 824 type_attribute_list: 825 type_attribute 826 | type_attribute_list type_attribute 827 ; 828 829 type_attribute_opt: 830 /* empty */ 831 | type_attribute 832 ; 833 834 type_attribute: /* See C11 6.7 declaration-specifiers */ 835 T_ATTRIBUTE T_LPAREN T_LPAREN { 836 attron = true; 837 } gcc_attribute_spec_list { 838 attron = false; 839 } T_RPAREN T_RPAREN 840 /* TODO: c11ism */ 841 | T_ALIGNAS T_LPAREN align_as T_RPAREN 842 | T_PACKED { 843 addpacked(); 844 } 845 | T_NORETURN 846 ; 847 848 align_as: /* See alignment-specifier in C11 6.7.5 */ 849 type_specifier 850 | constant_expr 851 ; 852 853 begin_type: 854 /* empty */ { 855 begin_type(); 856 } 857 ; 858 859 end_type: 860 /* empty */ { 861 end_type(); 862 } 863 ; 864 865 type_specifier: /* C99 6.7.2 */ 866 notype_type_specifier 867 | T_TYPENAME { 868 $$ = getsym($1)->s_type; 869 } 870 ; 871 872 notype_type_specifier: /* see C99 6.7.2 */ 873 T_TYPE { 874 $$ = gettyp($1); 875 } 876 | T_TYPEOF T_LPAREN expression T_RPAREN { /* GCC extension */ 877 $$ = $3->tn_type; 878 } 879 | struct_or_union_specifier { 880 end_declaration_level(); 881 $$ = $1; 882 } 883 | enum_specifier { 884 end_declaration_level(); 885 $$ = $1; 886 } 887 ; 888 889 struct_or_union_specifier: /* C99 6.7.2.1 */ 890 struct_or_union identifier_sym { 891 /* 892 * STDC requires that "struct a;" always introduces 893 * a new tag if "a" is not declared at current level 894 * 895 * yychar is valid because otherwise the parser would not 896 * have been able to decide if it must shift or reduce 897 */ 898 $$ = mktag($2, $1, false, yychar == T_SEMI); 899 } 900 | struct_or_union identifier_sym { 901 dcs->d_tagtyp = mktag($2, $1, true, false); 902 } braced_struct_declaration_list { 903 $$ = complete_tag_struct_or_union(dcs->d_tagtyp, $4); 904 } 905 | struct_or_union { 906 dcs->d_tagtyp = mktag(NULL, $1, true, false); 907 } braced_struct_declaration_list { 908 $$ = complete_tag_struct_or_union(dcs->d_tagtyp, $3); 909 } 910 | struct_or_union error { 911 symtyp = FVFT; 912 $$ = gettyp(INT); 913 } 914 ; 915 916 struct_or_union: /* C99 6.7.2.1 */ 917 struct_or_union type_attribute 918 | T_STRUCT_OR_UNION { 919 symtyp = FTAG; 920 begin_declaration_level($1 == STRUCT ? MOS : MOU); 921 dcs->d_offset = 0; 922 dcs->d_sou_align_in_bits = CHAR_SIZE; 923 $$ = $1; 924 } 925 ; 926 927 braced_struct_declaration_list: /* see C99 6.7.2.1 */ 928 struct_declaration_lbrace struct_declaration_list_with_rbrace { 929 $$ = $2; 930 } 931 ; 932 933 struct_declaration_lbrace: /* see C99 6.7.2.1 */ 934 T_LBRACE { 935 symtyp = FVFT; 936 } 937 ; 938 939 struct_declaration_list_with_rbrace: /* see C99 6.7.2.1 */ 940 struct_declaration_list T_RBRACE 941 | T_RBRACE { 942 /* XXX: This is not allowed by any C standard. */ 943 $$ = NULL; 944 } 945 ; 946 947 struct_declaration_list: /* C99 6.7.2.1 */ 948 struct_declaration 949 | struct_declaration_list struct_declaration { 950 $$ = lnklst($1, $2); 951 } 952 ; 953 954 struct_declaration: /* C99 6.7.2.1 */ 955 begin_type_qualifier_list end_type { 956 /* ^^ There is no check for the missing type-specifier. */ 957 /* too late, i know, but getsym() compensates it */ 958 symtyp = FMEMBER; 959 } notype_struct_declarators type_attribute_opt T_SEMI { 960 symtyp = FVFT; 961 $$ = $4; 962 } 963 | begin_type_specifier_qualifier_list end_type { 964 symtyp = FMEMBER; 965 } type_struct_declarators type_attribute_opt T_SEMI { 966 symtyp = FVFT; 967 $$ = $4; 968 } 969 | begin_type_qualifier_list end_type type_attribute_opt T_SEMI { 970 /* syntax error '%s' */ 971 error(249, "member without type"); 972 $$ = NULL; 973 } 974 | begin_type_specifier_qualifier_list end_type type_attribute_opt T_SEMI { 975 symtyp = FVFT; 976 if (!Sflag) 977 /* anonymous struct/union members is a C9X feature */ 978 warning(49); 979 if (is_struct_or_union(dcs->d_type->t_tspec)) { 980 $$ = dcs->d_type->t_str->sou_first_member; 981 /* add all the members of the anonymous struct/union */ 982 anonymize($$); 983 } else { 984 /* syntax error '%s' */ 985 error(249, "unnamed member"); 986 $$ = NULL; 987 } 988 } 989 | error T_SEMI { 990 symtyp = FVFT; 991 $$ = NULL; 992 } 993 ; 994 995 notype_struct_declarators: 996 notype_struct_declarator { 997 $$ = declarator_1_struct_union($1); 998 } 999 | notype_struct_declarators { 1000 symtyp = FMEMBER; 1001 } T_COMMA type_struct_declarator { 1002 $$ = lnklst($1, declarator_1_struct_union($4)); 1003 } 1004 ; 1005 1006 type_struct_declarators: 1007 type_struct_declarator { 1008 $$ = declarator_1_struct_union($1); 1009 } 1010 | type_struct_declarators { 1011 symtyp = FMEMBER; 1012 } T_COMMA type_struct_declarator { 1013 $$ = lnklst($1, declarator_1_struct_union($4)); 1014 } 1015 ; 1016 1017 notype_struct_declarator: 1018 notype_declarator 1019 | notype_declarator T_COLON constant_expr { /* C99 6.7.2.1 */ 1020 $$ = bitfield($1, to_int_constant($3, true)); 1021 } 1022 | { 1023 symtyp = FVFT; 1024 } T_COLON constant_expr { /* C99 6.7.2.1 */ 1025 $$ = bitfield(NULL, to_int_constant($3, true)); 1026 } 1027 ; 1028 1029 type_struct_declarator: 1030 type_declarator 1031 | type_declarator T_COLON constant_expr { 1032 $$ = bitfield($1, to_int_constant($3, true)); 1033 } 1034 | { 1035 symtyp = FVFT; 1036 } T_COLON constant_expr { 1037 $$ = bitfield(NULL, to_int_constant($3, true)); 1038 } 1039 ; 1040 1041 enum_specifier: /* C99 6.7.2.2 */ 1042 enum identifier_sym { 1043 $$ = mktag($2, ENUM, false, false); 1044 } 1045 | enum identifier_sym { 1046 dcs->d_tagtyp = mktag($2, ENUM, true, false); 1047 } enum_declaration { 1048 $$ = complete_tag_enum(dcs->d_tagtyp, $4); 1049 } 1050 | enum { 1051 dcs->d_tagtyp = mktag(NULL, ENUM, true, false); 1052 } enum_declaration { 1053 $$ = complete_tag_enum(dcs->d_tagtyp, $3); 1054 } 1055 | enum error { 1056 symtyp = FVFT; 1057 $$ = gettyp(INT); 1058 } 1059 ; 1060 1061 enum: /* helper for C99 6.7.2.2 */ 1062 T_ENUM { 1063 symtyp = FTAG; 1064 begin_declaration_level(CTCONST); 1065 } 1066 ; 1067 1068 enum_declaration: /* helper for C99 6.7.2.2 */ 1069 enum_decl_lbrace enums_with_opt_comma T_RBRACE { 1070 $$ = $2; 1071 } 1072 ; 1073 1074 enum_decl_lbrace: /* helper for C99 6.7.2.2 */ 1075 T_LBRACE { 1076 symtyp = FVFT; 1077 enumval = 0; 1078 } 1079 ; 1080 1081 enums_with_opt_comma: /* helper for C99 6.7.2.2 */ 1082 enumerator_list 1083 | enumerator_list T_COMMA { 1084 if (sflag) { 1085 /* trailing ',' prohibited in enum declaration */ 1086 error(54); 1087 } else { 1088 /* trailing ',' prohibited in enum declaration */ 1089 c99ism(54); 1090 } 1091 $$ = $1; 1092 } 1093 ; 1094 1095 enumerator_list: /* C99 6.7.2.2 */ 1096 enumerator 1097 | enumerator_list T_COMMA enumerator { 1098 $$ = lnklst($1, $3); 1099 } 1100 | error { 1101 $$ = NULL; 1102 } 1103 ; 1104 1105 enumerator: /* C99 6.7.2.2 */ 1106 identifier_sym { 1107 $$ = enumeration_constant($1, enumval, true); 1108 } 1109 | identifier_sym T_ASSIGN constant_expr { 1110 $$ = enumeration_constant($1, to_int_constant($3, true), false); 1111 } 1112 ; 1113 1114 type_qualifier: /* C99 6.7.3 */ 1115 T_QUAL { 1116 $$ = xcalloc(1, sizeof(*$$)); 1117 if ($1 == CONST) 1118 $$->p_const = true; 1119 if ($1 == VOLATILE) 1120 $$->p_volatile = true; 1121 } 1122 ; 1123 1124 pointer: /* C99 6.7.5 */ 1125 asterisk type_qualifier_list_opt { 1126 $$ = merge_qualified_pointer($1, $2); 1127 } 1128 | asterisk type_qualifier_list_opt pointer { 1129 $$ = merge_qualified_pointer($1, $2); 1130 $$ = merge_qualified_pointer($$, $3); 1131 } 1132 ; 1133 1134 asterisk: /* helper for 'pointer' */ 1135 T_ASTERISK { 1136 $$ = xcalloc(1, sizeof(*$$)); 1137 $$->p_pointer = true; 1138 } 1139 ; 1140 1141 type_qualifier_list_opt: /* see C99 6.7.5 */ 1142 /* empty */ { 1143 $$ = NULL; 1144 } 1145 | type_qualifier_list 1146 ; 1147 1148 type_qualifier_list: /* C99 6.7.5 */ 1149 type_qualifier 1150 | type_qualifier_list type_qualifier { 1151 $$ = merge_qualified_pointer($1, $2); 1152 } 1153 ; 1154 1155 /* 1156 * For an explanation of 'notype' in the following rules, see the Bison 1157 * manual, section 7.1 "Semantic Info in Token Kinds". 1158 */ 1159 1160 notype_init_declarators: 1161 notype_init_declarator 1162 | notype_init_declarators T_COMMA type_init_declarator 1163 ; 1164 1165 type_init_declarators: 1166 type_init_declarator 1167 | type_init_declarators T_COMMA type_init_declarator 1168 ; 1169 1170 notype_init_declarator: 1171 notype_declarator asm_or_symbolrename_opt { 1172 cgram_declare($1, false, $2); 1173 check_size($1); 1174 } 1175 | notype_declarator asm_or_symbolrename_opt { 1176 begin_initialization($1); 1177 cgram_declare($1, true, $2); 1178 } T_ASSIGN initializer { 1179 check_size($1); 1180 end_initialization(); 1181 } 1182 ; 1183 1184 type_init_declarator: 1185 type_declarator asm_or_symbolrename_opt { 1186 cgram_declare($1, false, $2); 1187 check_size($1); 1188 } 1189 | type_declarator asm_or_symbolrename_opt { 1190 begin_initialization($1); 1191 cgram_declare($1, true, $2); 1192 } T_ASSIGN initializer { 1193 check_size($1); 1194 end_initialization(); 1195 } 1196 ; 1197 1198 notype_declarator: 1199 notype_direct_declarator 1200 | pointer notype_direct_declarator { 1201 $$ = add_pointer($2, $1); 1202 } 1203 ; 1204 1205 type_declarator: 1206 type_direct_declarator 1207 | pointer type_direct_declarator { 1208 $$ = add_pointer($2, $1); 1209 } 1210 ; 1211 1212 notype_direct_declarator: 1213 T_NAME { 1214 $$ = declarator_name(getsym($1)); 1215 } 1216 | T_LPAREN type_declarator T_RPAREN { 1217 $$ = $2; 1218 } 1219 | type_attribute notype_direct_declarator { 1220 $$ = $2; 1221 } 1222 | notype_direct_declarator T_LBRACK T_RBRACK { 1223 $$ = add_array($1, false, 0); 1224 } 1225 | notype_direct_declarator T_LBRACK array_size T_RBRACK { 1226 $$ = add_array($1, true, to_int_constant($3, false)); 1227 } 1228 | notype_direct_declarator param_list asm_or_symbolrename_opt { 1229 $$ = add_function(symbolrename($1, $3), $2); 1230 end_declaration_level(); 1231 block_level--; 1232 } 1233 | notype_direct_declarator type_attribute 1234 ; 1235 1236 type_direct_declarator: 1237 identifier { 1238 $$ = declarator_name(getsym($1)); 1239 } 1240 | T_LPAREN type_declarator T_RPAREN { 1241 $$ = $2; 1242 } 1243 | type_attribute type_direct_declarator { 1244 $$ = $2; 1245 } 1246 | type_direct_declarator T_LBRACK T_RBRACK { 1247 $$ = add_array($1, false, 0); 1248 } 1249 | type_direct_declarator T_LBRACK array_size T_RBRACK { 1250 $$ = add_array($1, true, to_int_constant($3, false)); 1251 } 1252 | type_direct_declarator param_list asm_or_symbolrename_opt { 1253 $$ = add_function(symbolrename($1, $3), $2); 1254 end_declaration_level(); 1255 block_level--; 1256 } 1257 | type_direct_declarator type_attribute 1258 ; 1259 1260 /* 1261 * The two distinct rules type_param_declarator and notype_param_declarator avoid a 1262 * conflict in argument lists. A typename enclosed in parentheses is always 1263 * treated as a typename, not an argument name. For example, after 1264 * "typedef double a;", the declaration "f(int (a));" is interpreted as 1265 * "f(int (double));", not "f(int a);". 1266 */ 1267 type_param_declarator: 1268 direct_param_declarator 1269 | pointer direct_param_declarator { 1270 $$ = add_pointer($2, $1); 1271 } 1272 ; 1273 1274 notype_param_declarator: 1275 direct_notype_param_declarator 1276 | pointer direct_notype_param_declarator { 1277 $$ = add_pointer($2, $1); 1278 } 1279 ; 1280 1281 direct_param_declarator: 1282 identifier type_attribute_list { 1283 $$ = declarator_name(getsym($1)); 1284 } 1285 | identifier { 1286 $$ = declarator_name(getsym($1)); 1287 } 1288 | T_LPAREN notype_param_declarator T_RPAREN { 1289 $$ = $2; 1290 } 1291 | direct_param_declarator T_LBRACK T_RBRACK { 1292 $$ = add_array($1, false, 0); 1293 } 1294 | direct_param_declarator T_LBRACK array_size T_RBRACK { 1295 $$ = add_array($1, true, to_int_constant($3, false)); 1296 } 1297 | direct_param_declarator param_list asm_or_symbolrename_opt { 1298 $$ = add_function(symbolrename($1, $3), $2); 1299 end_declaration_level(); 1300 block_level--; 1301 } 1302 ; 1303 1304 direct_notype_param_declarator: 1305 identifier { 1306 $$ = declarator_name(getsym($1)); 1307 } 1308 | T_LPAREN notype_param_declarator T_RPAREN { 1309 $$ = $2; 1310 } 1311 | direct_notype_param_declarator T_LBRACK T_RBRACK { 1312 $$ = add_array($1, false, 0); 1313 } 1314 | direct_notype_param_declarator T_LBRACK array_size T_RBRACK { 1315 $$ = add_array($1, true, to_int_constant($3, false)); 1316 } 1317 | direct_notype_param_declarator param_list asm_or_symbolrename_opt { 1318 $$ = add_function(symbolrename($1, $3), $2); 1319 end_declaration_level(); 1320 block_level--; 1321 } 1322 ; 1323 1324 param_list: 1325 id_list_lparen identifier_list T_RPAREN { 1326 $$ = $2; 1327 } 1328 | abstract_decl_param_list 1329 ; 1330 1331 id_list_lparen: 1332 T_LPAREN { 1333 block_level++; 1334 begin_declaration_level(PROTO_ARG); 1335 } 1336 ; 1337 1338 array_size: 1339 type_qualifier_list_opt T_SCLASS constant_expr { 1340 /* C11 6.7.6.3p7 */ 1341 if ($2 != STATIC) 1342 yyerror("Bad attribute"); 1343 /* static array size is a C11 extension */ 1344 c11ism(343); 1345 $$ = $3; 1346 } 1347 | constant_expr 1348 ; 1349 1350 identifier_list: /* C99 6.7.5 */ 1351 T_NAME { 1352 $$ = old_style_function_name(getsym($1)); 1353 } 1354 | identifier_list T_COMMA T_NAME { 1355 $$ = lnklst($1, old_style_function_name(getsym($3))); 1356 } 1357 | identifier_list error 1358 ; 1359 1360 /* XXX: C99 requires an additional specifier-qualifier-list. */ 1361 type_name: /* C99 6.7.6 */ 1362 { 1363 begin_declaration_level(ABSTRACT); 1364 } abstract_declaration { 1365 end_declaration_level(); 1366 $$ = $2->s_type; 1367 } 1368 ; 1369 1370 abstract_declaration: 1371 begin_type_qualifier_list end_type { 1372 $$ = declare_1_abstract(abstract_name()); 1373 } 1374 | begin_type_specifier_qualifier_list end_type { 1375 $$ = declare_1_abstract(abstract_name()); 1376 } 1377 | begin_type_qualifier_list end_type abstract_declarator { 1378 $$ = declare_1_abstract($3); 1379 } 1380 | begin_type_specifier_qualifier_list end_type abstract_declarator { 1381 $$ = declare_1_abstract($3); 1382 } 1383 ; 1384 1385 abstract_declarator: /* C99 6.7.6 */ 1386 pointer { 1387 $$ = add_pointer(abstract_name(), $1); 1388 } 1389 | direct_abstract_declarator 1390 | pointer direct_abstract_declarator { 1391 $$ = add_pointer($2, $1); 1392 } 1393 ; 1394 1395 direct_abstract_declarator: /* C99 6.7.6 */ 1396 T_LPAREN abstract_declarator T_RPAREN { 1397 $$ = $2; 1398 } 1399 | T_LBRACK T_RBRACK { 1400 $$ = add_array(abstract_name(), false, 0); 1401 } 1402 | T_LBRACK array_size T_RBRACK { 1403 $$ = add_array(abstract_name(), true, to_int_constant($2, false)); 1404 } 1405 | type_attribute direct_abstract_declarator { 1406 $$ = $2; 1407 } 1408 | direct_abstract_declarator T_LBRACK T_RBRACK { 1409 $$ = add_array($1, false, 0); 1410 } 1411 | direct_abstract_declarator T_LBRACK T_ASTERISK T_RBRACK { /* C99 */ 1412 $$ = add_array($1, false, 0); 1413 } 1414 | direct_abstract_declarator T_LBRACK array_size T_RBRACK { 1415 $$ = add_array($1, true, to_int_constant($3, false)); 1416 } 1417 | abstract_decl_param_list asm_or_symbolrename_opt { 1418 $$ = add_function(symbolrename(abstract_name(), $2), $1); 1419 end_declaration_level(); 1420 block_level--; 1421 } 1422 | direct_abstract_declarator abstract_decl_param_list asm_or_symbolrename_opt { 1423 $$ = add_function(symbolrename($1, $3), $2); 1424 end_declaration_level(); 1425 block_level--; 1426 } 1427 | direct_abstract_declarator type_attribute_list 1428 ; 1429 1430 abstract_decl_param_list: 1431 abstract_decl_lparen T_RPAREN type_attribute_opt { 1432 $$ = NULL; 1433 } 1434 | abstract_decl_lparen vararg_parameter_type_list T_RPAREN type_attribute_opt { 1435 dcs->d_proto = true; 1436 $$ = $2; 1437 } 1438 | abstract_decl_lparen error T_RPAREN type_attribute_opt { 1439 $$ = NULL; 1440 } 1441 ; 1442 1443 abstract_decl_lparen: 1444 T_LPAREN { 1445 block_level++; 1446 begin_declaration_level(PROTO_ARG); 1447 } 1448 ; 1449 1450 vararg_parameter_type_list: 1451 parameter_type_list 1452 | parameter_type_list T_COMMA T_ELLIPSIS { 1453 dcs->d_vararg = true; 1454 $$ = $1; 1455 } 1456 | T_ELLIPSIS { 1457 if (sflag) { 1458 /* ANSI C requires formal parameter before '...' */ 1459 error(84); 1460 } else if (!tflag) { 1461 /* ANSI C requires formal parameter before '...' */ 1462 warning(84); 1463 } 1464 dcs->d_vararg = true; 1465 $$ = NULL; 1466 } 1467 ; 1468 1469 /* XXX: C99 6.7.5 defines the same name, but it looks different. */ 1470 parameter_type_list: 1471 parameter_declaration 1472 | parameter_type_list T_COMMA parameter_declaration { 1473 $$ = lnklst($1, $3); 1474 } 1475 ; 1476 1477 /* XXX: C99 6.7.5 defines the same name, but it looks completely different. */ 1478 parameter_declaration: 1479 begin_type_declmods end_type { 1480 /* ^^ There is no check for the missing type-specifier. */ 1481 $$ = declare_argument(abstract_name(), false); 1482 } 1483 | begin_type_declaration_specifiers end_type { 1484 $$ = declare_argument(abstract_name(), false); 1485 } 1486 | begin_type_declmods end_type notype_param_declarator { 1487 /* ^^ There is no check for the missing type-specifier. */ 1488 $$ = declare_argument($3, false); 1489 } 1490 /* 1491 * type_param_declarator is needed because of following conflict: 1492 * "typedef int a; f(int (a));" could be parsed as 1493 * "function with argument a of type int", or 1494 * "function with an abstract argument of type function". 1495 * This grammar realizes the second case. 1496 */ 1497 | begin_type_declaration_specifiers end_type type_param_declarator { 1498 $$ = declare_argument($3, false); 1499 } 1500 | begin_type_declmods end_type abstract_declarator { 1501 /* ^^ There is no check for the missing type-specifier. */ 1502 $$ = declare_argument($3, false); 1503 } 1504 | begin_type_declaration_specifiers end_type abstract_declarator { 1505 $$ = declare_argument($3, false); 1506 } 1507 ; 1508 1509 initializer: /* C99 6.7.8 "Initialization" */ 1510 assignment_expression { 1511 init_expr($1); 1512 } 1513 | init_lbrace init_rbrace { 1514 /* XXX: Empty braces are not covered by C99 6.7.8. */ 1515 } 1516 | init_lbrace initializer_list comma_opt init_rbrace 1517 /* XXX: What is this error handling for? */ 1518 | error 1519 ; 1520 1521 initializer_list: /* C99 6.7.8 "Initialization" */ 1522 initializer_list_item 1523 | initializer_list T_COMMA initializer_list_item 1524 ; 1525 1526 initializer_list_item: /* helper */ 1527 designation initializer 1528 | initializer 1529 ; 1530 1531 designation: /* C99 6.7.8 "Initialization" */ 1532 designator_list T_ASSIGN 1533 | identifier T_COLON { 1534 /* GCC style struct or union member name in initializer */ 1535 gnuism(315); 1536 add_designator_member($1); 1537 } 1538 ; 1539 1540 designator_list: /* C99 6.7.8 "Initialization" */ 1541 designator 1542 | designator_list designator 1543 ; 1544 1545 designator: /* C99 6.7.8 "Initialization" */ 1546 T_LBRACK range T_RBRACK { 1547 add_designator_subscript($2); 1548 if (!Sflag) 1549 /* array initializer with des.s is a C9X feature */ 1550 warning(321); 1551 } 1552 | T_POINT identifier { 1553 if (!Sflag) 1554 /* struct or union member name in initializer is ... */ 1555 warning(313); 1556 add_designator_member($2); 1557 } 1558 ; 1559 1560 range: 1561 constant_expr { 1562 $$.lo = to_int_constant($1, true); 1563 $$.hi = $$.lo; 1564 } 1565 | constant_expr T_ELLIPSIS constant_expr { 1566 $$.lo = to_int_constant($1, true); 1567 $$.hi = to_int_constant($3, true); 1568 /* initialization with '[a...b]' is a GCC extension */ 1569 gnuism(340); 1570 } 1571 ; 1572 1573 init_lbrace: /* helper */ 1574 T_LBRACE { 1575 init_lbrace(); 1576 } 1577 ; 1578 1579 init_rbrace: /* helper */ 1580 T_RBRACE { 1581 init_rbrace(); 1582 } 1583 ; 1584 1585 asm_or_symbolrename_opt: /* GCC extensions */ 1586 /* empty */ { 1587 $$ = NULL; 1588 } 1589 | T_ASM T_LPAREN T_STRING T_RPAREN { 1590 freeyyv(&$3, T_STRING); 1591 $$ = NULL; 1592 } 1593 | T_SYMBOLRENAME T_LPAREN T_NAME T_RPAREN { 1594 $$ = $3; 1595 } 1596 ; 1597 1598 statement: /* C99 6.8 */ 1599 expression_statement 1600 | non_expr_statement 1601 ; 1602 1603 non_expr_statement: /* helper for C99 6.8 */ 1604 type_attribute T_SEMI 1605 | labeled_statement 1606 | compound_statement 1607 | selection_statement 1608 | iteration_statement 1609 | jump_statement { 1610 seen_fallthrough = false; 1611 } 1612 | asm_statement 1613 ; 1614 1615 labeled_statement: /* C99 6.8.1 */ 1616 label type_attribute_opt statement 1617 ; 1618 1619 label: 1620 T_NAME T_COLON { 1621 symtyp = FLABEL; 1622 named_label(getsym($1)); 1623 } 1624 | T_CASE constant_expr T_COLON { 1625 case_label($2); 1626 seen_fallthrough = true; 1627 } 1628 | T_CASE constant_expr T_ELLIPSIS constant_expr T_COLON { 1629 /* XXX: We don't fill all cases */ 1630 case_label($2); 1631 seen_fallthrough = true; 1632 } 1633 | T_DEFAULT T_COLON { 1634 default_label(); 1635 seen_fallthrough = true; 1636 } 1637 ; 1638 1639 compound_statement: /* C99 6.8.2 */ 1640 compound_statement_lbrace compound_statement_rbrace 1641 | compound_statement_lbrace block_item_list compound_statement_rbrace 1642 ; 1643 1644 compound_statement_lbrace: 1645 T_LBRACE { 1646 block_level++; 1647 mem_block_level++; 1648 begin_declaration_level(AUTO); 1649 } 1650 ; 1651 1652 compound_statement_rbrace: 1653 T_RBRACE { 1654 end_declaration_level(); 1655 freeblk(); 1656 mem_block_level--; 1657 block_level--; 1658 seen_fallthrough = false; 1659 } 1660 ; 1661 1662 block_item_list: /* C99 6.8.2 */ 1663 block_item 1664 | block_item_list block_item { 1665 if (!Sflag && $1 && !$2) 1666 /* declarations after statements is a C99 feature */ 1667 c99ism(327); 1668 $$ = $1 || $2; 1669 } 1670 ; 1671 1672 block_item: /* C99 6.8.2 */ 1673 declaration_or_error { 1674 $$ = false; 1675 restore_warning_flags(); 1676 } 1677 | statement { 1678 $$ = true; 1679 restore_warning_flags(); 1680 } 1681 ; 1682 1683 expression_statement: /* C99 6.8.3 */ 1684 expression T_SEMI { 1685 expr($1, false, false, false, false); 1686 seen_fallthrough = false; 1687 } 1688 | T_SEMI { 1689 seen_fallthrough = false; 1690 } 1691 ; 1692 1693 selection_statement: /* C99 6.8.4 */ 1694 if_without_else %prec T_THEN { 1695 save_warning_flags(); 1696 if2(); 1697 if3(false); 1698 } 1699 | if_without_else T_ELSE { 1700 save_warning_flags(); 1701 if2(); 1702 } statement { 1703 clear_warning_flags(); 1704 if3(true); 1705 } 1706 | if_without_else T_ELSE error { 1707 clear_warning_flags(); 1708 if3(false); 1709 } 1710 | switch_expr statement { 1711 clear_warning_flags(); 1712 switch2(); 1713 } 1714 | switch_expr error { 1715 clear_warning_flags(); 1716 switch2(); 1717 } 1718 ; 1719 1720 if_without_else: /* see C99 6.8.4 */ 1721 if_expr statement 1722 | if_expr error 1723 ; 1724 1725 if_expr: /* see C99 6.8.4 */ 1726 T_IF T_LPAREN expression T_RPAREN { 1727 if1($3); 1728 clear_warning_flags(); 1729 } 1730 ; 1731 1732 switch_expr: /* see C99 6.8.4 */ 1733 T_SWITCH T_LPAREN expression T_RPAREN { 1734 switch1($3); 1735 clear_warning_flags(); 1736 } 1737 ; 1738 1739 iteration_statement: /* C99 6.8.5 */ 1740 while_expr statement { 1741 clear_warning_flags(); 1742 while2(); 1743 } 1744 | while_expr error { 1745 clear_warning_flags(); 1746 while2(); 1747 } 1748 | do_statement do_while_expr { 1749 do2($2); 1750 seen_fallthrough = false; 1751 } 1752 | do error { 1753 clear_warning_flags(); 1754 do2(NULL); 1755 } 1756 | for_exprs statement { 1757 clear_warning_flags(); 1758 for2(); 1759 end_declaration_level(); 1760 block_level--; 1761 } 1762 | for_exprs error { 1763 clear_warning_flags(); 1764 for2(); 1765 end_declaration_level(); 1766 block_level--; 1767 } 1768 ; 1769 1770 while_expr: /* see C99 6.8.5 */ 1771 T_WHILE T_LPAREN expression T_RPAREN { 1772 while1($3); 1773 clear_warning_flags(); 1774 } 1775 ; 1776 1777 do_statement: /* see C99 6.8.5 */ 1778 do statement { 1779 clear_warning_flags(); 1780 } 1781 ; 1782 1783 do: /* see C99 6.8.5 */ 1784 T_DO { 1785 do1(); 1786 } 1787 ; 1788 1789 do_while_expr: /* see C99 6.8.5 */ 1790 T_WHILE T_LPAREN expression T_RPAREN T_SEMI { 1791 $$ = $3; 1792 } 1793 ; 1794 1795 for_start: /* see C99 6.8.5 */ 1796 T_FOR T_LPAREN { 1797 begin_declaration_level(AUTO); 1798 block_level++; 1799 } 1800 ; 1801 1802 for_exprs: /* see C99 6.8.5 */ 1803 for_start 1804 begin_type_declaration_specifiers end_type 1805 notype_init_declarators T_SEMI 1806 expression_opt T_SEMI expression_opt T_RPAREN { 1807 /* variable declaration in for loop */ 1808 c99ism(325); 1809 for1(NULL, $6, $8); 1810 clear_warning_flags(); 1811 } 1812 | for_start 1813 expression_opt T_SEMI 1814 expression_opt T_SEMI 1815 expression_opt T_RPAREN { 1816 for1($2, $4, $6); 1817 clear_warning_flags(); 1818 } 1819 ; 1820 1821 jump_statement: /* C99 6.8.6 */ 1822 goto identifier T_SEMI { 1823 do_goto(getsym($2)); 1824 } 1825 | goto error T_SEMI { 1826 symtyp = FVFT; 1827 } 1828 | T_CONTINUE T_SEMI { 1829 do_continue(); 1830 } 1831 | T_BREAK T_SEMI { 1832 do_break(); 1833 } 1834 | T_RETURN T_SEMI { 1835 do_return(NULL); 1836 } 1837 | T_RETURN expression T_SEMI { 1838 do_return($2); 1839 } 1840 ; 1841 1842 goto: /* see C99 6.8.6 */ 1843 T_GOTO { 1844 symtyp = FLABEL; 1845 } 1846 ; 1847 1848 asm_statement: /* GCC extension */ 1849 T_ASM T_LPAREN read_until_rparen T_SEMI { 1850 setasm(); 1851 } 1852 | T_ASM T_QUAL T_LPAREN read_until_rparen T_SEMI { 1853 setasm(); 1854 } 1855 | T_ASM error 1856 ; 1857 1858 read_until_rparen: /* helper for 'asm_statement' */ 1859 /* empty */ { 1860 read_until_rparen(); 1861 } 1862 ; 1863 1864 translation_unit: /* C99 6.9 */ 1865 external_declaration 1866 | translation_unit external_declaration 1867 ; 1868 1869 external_declaration: /* C99 6.9 */ 1870 function_definition { 1871 global_clean_up_decl(false); 1872 clear_warning_flags(); 1873 } 1874 | top_level_declaration { 1875 global_clean_up_decl(false); 1876 clear_warning_flags(); 1877 } 1878 | asm_statement /* GCC extension */ 1879 | T_SEMI { /* GCC extension */ 1880 if (sflag) { 1881 /* empty declaration */ 1882 error(0); 1883 } else if (!tflag) { 1884 /* empty declaration */ 1885 warning(0); 1886 } 1887 } 1888 ; 1889 1890 /* 1891 * On the top level, lint allows several forms of declarations that it doesn't 1892 * allow in functions. For example, a single ';' is an empty declaration and 1893 * is supported by some compilers, but in a function it would be an empty 1894 * statement, not a declaration. This makes a difference in C90 mode, where 1895 * a statement must not be followed by a declaration. 1896 * 1897 * See 'declaration' for all other declarations. 1898 */ 1899 top_level_declaration: /* C99 6.9 calls this 'declaration' */ 1900 begin_type end_type notype_init_declarators T_SEMI { 1901 if (sflag) { 1902 /* old style declaration; add 'int' */ 1903 error(1); 1904 } else if (!tflag) { 1905 /* old style declaration; add 'int' */ 1906 warning(1); 1907 } 1908 } 1909 | declaration 1910 | error T_SEMI { 1911 global_clean_up(); 1912 } 1913 | error T_RBRACE { 1914 global_clean_up(); 1915 } 1916 ; 1917 1918 function_definition: /* C99 6.9.1 */ 1919 func_declarator { 1920 if ($1->s_type->t_tspec != FUNC) { 1921 /* syntax error '%s' */ 1922 error(249, yytext); 1923 YYERROR; 1924 } 1925 if ($1->s_type->t_typedef) { 1926 /* ()-less function definition */ 1927 error(64); 1928 YYERROR; 1929 } 1930 funcdef($1); 1931 block_level++; 1932 begin_declaration_level(ARG); 1933 if (lwarn == LWARN_NONE) 1934 $1->s_used = true; 1935 } arg_declaration_list_opt { 1936 end_declaration_level(); 1937 block_level--; 1938 check_func_lint_directives(); 1939 check_func_old_style_arguments(); 1940 begin_control_statement(CS_FUNCTION_BODY); 1941 } compound_statement { 1942 funcend(); 1943 end_control_statement(CS_FUNCTION_BODY); 1944 } 1945 ; 1946 1947 func_declarator: 1948 begin_type end_type notype_declarator { 1949 /* ^^ There is no check for the missing type-specifier. */ 1950 $$ = $3; 1951 } 1952 | begin_type_declmods end_type notype_declarator { 1953 /* ^^ There is no check for the missing type-specifier. */ 1954 $$ = $3; 1955 } 1956 | begin_type_declaration_specifiers end_type type_declarator { 1957 $$ = $3; 1958 } 1959 ; 1960 1961 arg_declaration_list_opt: /* C99 6.9.1p13 example 1 */ 1962 /* empty */ 1963 | arg_declaration_list 1964 ; 1965 1966 arg_declaration_list: /* C99 6.9.1p13 example 1 */ 1967 arg_declaration 1968 | arg_declaration_list arg_declaration 1969 /* XXX or better "arg_declaration error" ? */ 1970 | error 1971 ; 1972 1973 /* 1974 * "arg_declaration" is separated from "declaration" because it 1975 * needs other error handling. 1976 */ 1977 arg_declaration: 1978 begin_type_declmods end_type T_SEMI { 1979 /* empty declaration */ 1980 warning(2); 1981 } 1982 | begin_type_declmods end_type notype_init_declarators T_SEMI 1983 | begin_type_declaration_specifiers end_type T_SEMI { 1984 if (!dcs->d_nonempty_decl) { 1985 /* empty declaration */ 1986 warning(2); 1987 } else { 1988 /* '%s' declared in argument declaration list */ 1989 warning(3, type_name(dcs->d_type)); 1990 } 1991 } 1992 | begin_type_declaration_specifiers end_type 1993 type_init_declarators T_SEMI { 1994 if (dcs->d_nonempty_decl) { 1995 /* '%s' declared in argument declaration list */ 1996 warning(3, type_name(dcs->d_type)); 1997 } 1998 } 1999 | begin_type_declmods error 2000 | begin_type_declaration_specifiers error 2001 ; 2002 2003 gcc_attribute_spec_list: 2004 gcc_attribute_spec 2005 | gcc_attribute_spec_list T_COMMA gcc_attribute_spec 2006 ; 2007 2008 gcc_attribute_spec: 2009 /* empty */ 2010 | T_AT_ALWAYS_INLINE 2011 | T_AT_ALIAS T_LPAREN string T_RPAREN 2012 | T_AT_ALIGNED T_LPAREN constant_expr T_RPAREN 2013 | T_AT_ALIGNED 2014 | T_AT_ALLOC_SIZE T_LPAREN constant_expr T_COMMA constant_expr T_RPAREN 2015 | T_AT_ALLOC_SIZE T_LPAREN constant_expr T_RPAREN 2016 | T_AT_BOUNDED T_LPAREN gcc_attribute_bounded 2017 T_COMMA constant_expr T_COMMA constant_expr T_RPAREN 2018 | T_AT_COLD 2019 | T_AT_COMMON 2020 | T_AT_CONSTRUCTOR T_LPAREN constant_expr T_RPAREN 2021 | T_AT_CONSTRUCTOR 2022 | T_AT_DEPRECATED T_LPAREN string T_RPAREN 2023 | T_AT_DEPRECATED 2024 | T_AT_DESTRUCTOR T_LPAREN constant_expr T_RPAREN 2025 | T_AT_DESTRUCTOR 2026 | T_AT_FALLTHROUGH { 2027 fallthru(1); 2028 } 2029 | T_AT_FORMAT T_LPAREN gcc_attribute_format T_COMMA 2030 constant_expr T_COMMA constant_expr T_RPAREN 2031 | T_AT_FORMAT_ARG T_LPAREN constant_expr T_RPAREN 2032 | T_AT_GNU_INLINE 2033 | T_AT_HOT 2034 | T_AT_MALLOC 2035 | T_AT_MAY_ALIAS 2036 | T_AT_MODE T_LPAREN T_NAME T_RPAREN 2037 | T_AT_NOINLINE 2038 | T_AT_NONNULL T_LPAREN constant_expr_list_opt T_RPAREN 2039 | T_AT_NONNULL 2040 | T_AT_NONSTRING 2041 | T_AT_NORETURN 2042 | T_AT_NOTHROW 2043 | T_AT_NO_INSTRUMENT_FUNCTION 2044 | T_AT_OPTIMIZE T_LPAREN string T_RPAREN 2045 | T_AT_PACKED { 2046 addpacked(); 2047 } 2048 | T_AT_PCS T_LPAREN string T_RPAREN 2049 | T_AT_PURE 2050 | T_AT_RETURNS_TWICE 2051 | T_AT_SECTION T_LPAREN string T_RPAREN 2052 | T_AT_SENTINEL T_LPAREN constant_expr T_RPAREN 2053 | T_AT_SENTINEL 2054 | T_AT_TLS_MODEL T_LPAREN string T_RPAREN 2055 | T_AT_TUNION 2056 | T_AT_UNUSED { 2057 add_attr_used(); 2058 } 2059 | T_AT_USED { 2060 add_attr_used(); 2061 } 2062 | T_AT_VISIBILITY T_LPAREN constant_expr T_RPAREN 2063 | T_AT_WARN_UNUSED_RESULT 2064 | T_AT_WEAK 2065 | T_QUAL { 2066 if ($1 != CONST) 2067 yyerror("Bad attribute"); 2068 } 2069 ; 2070 2071 gcc_attribute_bounded: 2072 T_AT_MINBYTES 2073 | T_AT_STRING 2074 | T_AT_BUFFER 2075 ; 2076 2077 gcc_attribute_format: 2078 T_AT_FORMAT_GNU_PRINTF 2079 | T_AT_FORMAT_PRINTF 2080 | T_AT_FORMAT_SCANF 2081 | T_AT_FORMAT_STRFMON 2082 | T_AT_FORMAT_STRFTIME 2083 | T_AT_FORMAT_SYSLOG 2084 ; 2085 2086 %% 2087 2088 /* ARGSUSED */ 2089 int 2090 yyerror(const char *msg) 2091 { 2092 /* syntax error '%s' */ 2093 error(249, yytext); 2094 if (++sytxerr >= 5) 2095 norecover(); 2096 return 0; 2097 } 2098 2099 static void 2100 cgram_declare(sym_t *decl, bool initflg, sbuf_t *renaming) 2101 { 2102 declare(decl, initflg, renaming); 2103 if (renaming != NULL) 2104 freeyyv(&renaming, T_NAME); 2105 } 2106 2107 /* 2108 * Discard all input tokens up to and including the next 2109 * unmatched right paren 2110 */ 2111 static void 2112 read_until_rparen(void) 2113 { 2114 int level; 2115 2116 if (yychar < 0) 2117 yychar = yylex(); 2118 freeyyv(&yylval, yychar); 2119 2120 level = 1; 2121 while (yychar != T_RPAREN || --level > 0) { 2122 if (yychar == T_LPAREN) { 2123 level++; 2124 } else if (yychar <= 0) { 2125 break; 2126 } 2127 freeyyv(&yylval, yychar = yylex()); 2128 } 2129 2130 yyclearin; 2131 } 2132 2133 static sym_t * 2134 symbolrename(sym_t *s, sbuf_t *sb) 2135 { 2136 if (sb != NULL) 2137 s->s_rename = sb->sb_name; 2138 return s; 2139 } 2140
Indexes created Mon Oct 13 05:10:05 GMT 2025