cgram.y revision 1.323
1 %{ 2 /* $NetBSD: cgram.y,v 1.323 2021/07/14 17:07:24 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 1.323 2021/07/14 17:07:24 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 ignore_up_to_rparen(void); 71 static sym_t *symbolrename(sym_t *, sbuf_t *); 72 73 74 #ifdef DEBUG 75 static void 76 CLEAR_WARN_FLAGS(const char *file, size_t line) 77 { 78 printf("%s:%d: %s:%zu: clearing flags\n", 79 curr_pos.p_file, curr_pos.p_line, file, line); 80 clear_warn_flags(); 81 olwarn = LWARN_BAD; 82 } 83 84 static void 85 SAVE_WARN_FLAGS(const char *file, size_t line) 86 { 87 lint_assert(olwarn == LWARN_BAD); 88 printf("%s:%d: %s:%zu: saving flags %d\n", 89 curr_pos.p_file, curr_pos.p_line, file, line, lwarn); 90 olwarn = lwarn; 91 } 92 93 static void 94 RESTORE_WARN_FLAGS(const char *file, size_t line) 95 { 96 if (olwarn != LWARN_BAD) { 97 lwarn = olwarn; 98 printf("%s:%d: %s:%zu: restoring flags %d\n", 99 curr_pos.p_file, curr_pos.p_line, file, line, lwarn); 100 olwarn = LWARN_BAD; 101 } else 102 CLEAR_WARN_FLAGS(file, line); 103 } 104 #define cgram_debug(fmt, args...) printf("cgram_debug: " fmt "\n", ##args) 105 #else 106 #define CLEAR_WARN_FLAGS(f, l) clear_warn_flags(), olwarn = LWARN_BAD 107 #define SAVE_WARN_FLAGS(f, l) olwarn = lwarn 108 #define RESTORE_WARN_FLAGS(f, l) \ 109 (void)(olwarn == LWARN_BAD ? (clear_warn_flags(), 0) : (lwarn = olwarn)) 110 #define cgram_debug(fmt, args...) do { } while (false) 111 #endif 112 113 #define clear_warning_flags() CLEAR_WARN_FLAGS(__FILE__, __LINE__) 114 #define save_warning_flags() SAVE_WARN_FLAGS(__FILE__, __LINE__) 115 #define restore_warning_flags() RESTORE_WARN_FLAGS(__FILE__, __LINE__) 116 117 /* unbind the anonymous struct members from the struct */ 118 static void 119 anonymize(sym_t *s) 120 { 121 for ( ; s != NULL; s = s->s_next) 122 s->s_styp = NULL; 123 } 124 125 %} 126 127 %expect 165 128 129 %union { 130 val_t *y_val; 131 sbuf_t *y_name; 132 sym_t *y_sym; 133 op_t y_op; 134 scl_t y_scl; 135 tspec_t y_tspec; 136 tqual_t y_tqual; 137 type_t *y_type; 138 tnode_t *y_tnode; 139 range_t y_range; 140 strg_t *y_string; 141 qual_ptr *y_qual_ptr; 142 bool y_seen_statement; 143 struct generic_association *y_generic; 144 }; 145 146 %token T_LBRACE T_RBRACE T_LBRACK T_RBRACK T_LPAREN T_RPAREN 147 %token T_POINT T_ARROW 148 %token T_COMPLEMENT T_LOGNOT 149 %token <y_op> T_INCDEC 150 %token T_SIZEOF 151 %token T_BUILTIN_OFFSETOF 152 %token T_TYPEOF 153 %token T_EXTENSION 154 %token T_ALIGNAS 155 %token T_ALIGNOF 156 %token T_ASTERISK 157 %token <y_op> T_MULTIPLICATIVE 158 %token <y_op> T_ADDITIVE 159 %token <y_op> T_SHIFT 160 %token <y_op> T_RELATIONAL 161 %token <y_op> T_EQUALITY 162 %token T_AMPER 163 %token T_BITXOR 164 %token T_BITOR 165 %token T_LOGAND 166 %token T_LOGOR 167 %token T_QUEST 168 %token T_COLON 169 %token T_ASSIGN 170 %token <y_op> T_OPASSIGN 171 %token T_COMMA 172 %token T_SEMI 173 %token T_ELLIPSIS 174 %token T_REAL 175 %token T_IMAG 176 %token T_GENERIC 177 %token T_NORETURN 178 179 /* storage classes (extern, static, auto, register and typedef) */ 180 %token <y_scl> T_SCLASS 181 182 /* 183 * predefined type keywords (char, int, short, long, unsigned, signed, 184 * float, double, void); see T_TYPENAME 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> expression_opt 299 %type <y_tnode> expression 300 %type <y_tnode> assignment_expression 301 %type <y_tnode> constant_expr 302 303 %type <y_type> begin_type_typespec 304 %type <y_type> type_specifier 305 %type <y_type> notype_type_specifier 306 %type <y_type> struct_or_union_specifier 307 %type <y_tspec> struct_or_union 308 %type <y_sym> braced_struct_declaration_list 309 %type <y_sym> struct_declaration_list_with_rbrace 310 %type <y_sym> struct_declaration_list 311 %type <y_sym> struct_declaration 312 %type <y_sym> notype_member_decls 313 %type <y_sym> type_member_decls 314 %type <y_sym> notype_member_decl 315 %type <y_sym> type_member_decl 316 %type <y_type> enum_specifier 317 %type <y_sym> enum_declaration 318 %type <y_sym> enums_with_opt_comma 319 %type <y_sym> enumerator_list 320 %type <y_sym> enumerator 321 %type <y_qual_ptr> type_qualifier 322 %type <y_qual_ptr> pointer 323 %type <y_qual_ptr> asterisk 324 %type <y_qual_ptr> type_qualifier_list_opt 325 %type <y_qual_ptr> type_qualifier_list 326 %type <y_sym> notype_decl 327 %type <y_sym> type_decl 328 %type <y_sym> notype_direct_decl 329 %type <y_sym> type_direct_decl 330 %type <y_sym> type_param_decl 331 %type <y_sym> notype_param_decl 332 %type <y_sym> direct_param_decl 333 %type <y_sym> direct_notype_param_decl 334 %type <y_sym> param_list 335 %type <y_tnode> array_size 336 %type <y_sym> identifier_list 337 %type <y_type> type_name 338 %type <y_sym> abstract_declaration 339 %type <y_sym> abstract_declarator 340 %type <y_sym> direct_abstract_declarator 341 %type <y_sym> abstract_decl_param_list 342 %type <y_sym> vararg_parameter_type_list 343 %type <y_sym> parameter_type_list 344 %type <y_sym> parameter_declaration 345 %type <y_range> range 346 %type <y_name> asm_or_symbolrename_opt 347 348 %type <y_seen_statement> block_item_list 349 %type <y_seen_statement> block_item 350 %type <y_tnode> do_while_expr 351 %type <y_sym> func_decl 352 353 %% 354 355 program: 356 /* empty */ { 357 if (sflag) { 358 /* empty translation unit */ 359 error(272); 360 } else if (!tflag) { 361 /* empty translation unit */ 362 warning(272); 363 } 364 } 365 | translation_unit 366 ; 367 368 identifier_sym: /* helper for struct/union/enum */ 369 identifier { 370 $$ = getsym($1); 371 } 372 ; 373 374 /* K&R ???, C90 ???, C99 6.4.2.1, C11 ??? */ 375 identifier: 376 T_NAME { 377 $$ = $1; 378 cgram_debug("name '%s'", $$->sb_name); 379 } 380 | T_TYPENAME { 381 $$ = $1; 382 cgram_debug("typename '%s'", $$->sb_name); 383 } 384 ; 385 386 /* see C99 6.4.5, string literals are joined by 5.1.1.2 */ 387 string: 388 T_STRING 389 | T_STRING string2 { 390 $$ = cat_strings($1, $2); 391 } 392 ; 393 394 /* see C99 6.4.5, string literals are joined by 5.1.1.2 */ 395 string2: 396 T_STRING { 397 if (tflag) { 398 /* concatenated strings are illegal in traditional C */ 399 warning(219); 400 } 401 $$ = $1; 402 } 403 | string2 T_STRING { 404 $$ = cat_strings($1, $2); 405 } 406 ; 407 408 /* K&R 7.1, C90 ???, C99 6.5.1, C11 6.5.1 */ 409 primary_expression: 410 T_NAME { 411 /* XXX really necessary? */ 412 if (yychar < 0) 413 yychar = yylex(); 414 $$ = new_name_node(getsym($1), yychar); 415 } 416 | T_CON { 417 $$ = expr_new_constant(gettyp($1->v_tspec), $1); 418 } 419 | string { 420 $$ = new_string_node($1); 421 } 422 | T_LPAREN expression T_RPAREN { 423 if ($2 != NULL) 424 $2->tn_parenthesized = true; 425 $$ = $2; 426 } 427 | generic_selection 428 /* GCC primary-expression, see c_parser_postfix_expression */ 429 | T_BUILTIN_OFFSETOF T_LPAREN type_name T_COMMA identifier T_RPAREN { 430 symtyp = FMEMBER; 431 $$ = build_offsetof($3, getsym($5)); 432 } 433 ; 434 435 /* K&R ---, C90 ---, C99 ---, C11 6.5.1.1 */ 436 generic_selection: 437 T_GENERIC T_LPAREN assignment_expression T_COMMA 438 generic_assoc_list T_RPAREN { 439 /* generic selection requires C11 or later */ 440 c11ism(345); 441 $$ = build_generic_selection($3, $5); 442 } 443 ; 444 445 /* K&R ---, C90 ---, C99 ---, C11 6.5.1.1 */ 446 generic_assoc_list: 447 generic_association 448 | generic_assoc_list T_COMMA generic_association { 449 $3->ga_prev = $1; 450 $$ = $3; 451 } 452 ; 453 454 /* K&R ---, C90 ---, C99 ---, C11 6.5.1.1 */ 455 generic_association: 456 type_name T_COLON assignment_expression { 457 $$ = getblk(sizeof(*$$)); 458 $$->ga_arg = $1; 459 $$->ga_result = $3; 460 } 461 | T_DEFAULT T_COLON assignment_expression { 462 $$ = getblk(sizeof(*$$)); 463 $$->ga_arg = NULL; 464 $$->ga_result = $3; 465 } 466 ; 467 468 /* K&R 7.1, C90 ???, C99 6.5.2, C11 6.5.2 */ 469 postfix_expression: 470 primary_expression 471 | postfix_expression T_LBRACK expression T_RBRACK { 472 $$ = build(INDIR, build(PLUS, $1, $3), NULL); 473 } 474 | postfix_expression T_LPAREN T_RPAREN { 475 $$ = new_function_call_node($1, NULL); 476 } 477 | postfix_expression T_LPAREN argument_expression_list T_RPAREN { 478 $$ = new_function_call_node($1, $3); 479 } 480 | postfix_expression point_or_arrow T_NAME { 481 $$ = build_member_access($1, $2, $3); 482 } 483 | postfix_expression T_INCDEC { 484 $$ = build($2 == INC ? INCAFT : DECAFT, $1, NULL); 485 } 486 | T_LPAREN type_name T_RPAREN { /* C99 6.5.2.5 "Compound literals" */ 487 sym_t *tmp = mktempsym($2); 488 begin_initialization(tmp); 489 cgram_declare(tmp, true, NULL); 490 } init_lbrace initializer_list comma_opt init_rbrace { 491 if (!Sflag) 492 /* compound literals are a C9X/GCC extension */ 493 gnuism(319); 494 $$ = new_name_node(*current_initsym(), 0); 495 end_initialization(); 496 } 497 | T_LPAREN compound_statement_lbrace gcc_statement_expr_list { 498 block_level--; 499 mem_block_level--; 500 begin_initialization(mktempsym(dup_type($3->tn_type))); 501 mem_block_level++; 502 block_level++; 503 /* ({ }) is a GCC extension */ 504 gnuism(320); 505 } compound_statement_rbrace T_RPAREN { 506 $$ = new_name_node(*current_initsym(), 0); 507 end_initialization(); 508 } 509 ; 510 511 comma_opt: /* helper for 'postfix_expression' */ 512 /* empty */ 513 | T_COMMA 514 ; 515 516 /* 517 * The inner part of a GCC statement-expression of the form ({ ... }). 518 * 519 * https://gcc.gnu.org/onlinedocs/gcc/Statement-Exprs.html 520 */ 521 gcc_statement_expr_list: 522 gcc_statement_expr_item 523 | gcc_statement_expr_list gcc_statement_expr_item { 524 $$ = $2; 525 } 526 ; 527 528 gcc_statement_expr_item: 529 declaration { 530 clear_warning_flags(); 531 $$ = NULL; 532 } 533 | non_expr_statement { 534 $$ = expr_zalloc_tnode(); 535 $$->tn_type = gettyp(VOID); 536 } 537 | expression T_SEMI { 538 if ($1 == NULL) { /* in case of syntax errors */ 539 $$ = expr_zalloc_tnode(); 540 $$->tn_type = gettyp(VOID); 541 } else { 542 /* XXX: do that only on the last name */ 543 if ($1->tn_op == NAME) 544 $1->tn_sym->s_used = true; 545 $$ = $1; 546 expr($1, false, false, false, false); 547 seen_fallthrough = false; 548 } 549 } 550 ; 551 552 point_or_arrow: /* helper for 'postfix_expression' */ 553 T_POINT { 554 symtyp = FMEMBER; 555 $$ = POINT; 556 } 557 | T_ARROW { 558 symtyp = FMEMBER; 559 $$ = ARROW; 560 } 561 ; 562 563 /* K&R 7.1, C90 ???, C99 6.5.2, C11 6.5.2 */ 564 argument_expression_list: 565 expression %prec T_COMMA { 566 $$ = new_function_argument_node(NULL, $1); 567 } 568 | argument_expression_list T_COMMA expression { 569 $$ = new_function_argument_node($1, $3); 570 } 571 ; 572 573 /* K&R 7.2, C90 ???, C99 6.5.3, C11 6.5.3 */ 574 unary_expression: 575 postfix_expression 576 | T_INCDEC unary_expression { 577 $$ = build($1 == INC ? INCBEF : DECBEF, $2, NULL); 578 } 579 | T_AMPER cast_expression { 580 $$ = build(ADDR, $2, NULL); 581 } 582 | T_ASTERISK cast_expression { 583 $$ = build(INDIR, $2, NULL); 584 } 585 | T_ADDITIVE cast_expression { 586 if (tflag && $1 == PLUS) { 587 /* unary + is illegal in traditional C */ 588 warning(100); 589 } 590 $$ = build($1 == PLUS ? UPLUS : UMINUS, $2, NULL); 591 } 592 | T_COMPLEMENT cast_expression { 593 $$ = build(COMPL, $2, NULL); 594 } 595 | T_LOGNOT cast_expression { 596 $$ = build(NOT, $2, NULL); 597 } 598 | T_REAL cast_expression { /* GCC c_parser_unary_expression */ 599 $$ = build(REAL, $2, NULL); 600 } 601 | T_IMAG cast_expression { /* GCC c_parser_unary_expression */ 602 $$ = build(IMAG, $2, NULL); 603 } 604 | T_EXTENSION cast_expression { /* GCC c_parser_unary_expression */ 605 $$ = $2; 606 } 607 | T_SIZEOF unary_expression { 608 $$ = $2 == NULL ? NULL : build_sizeof($2->tn_type); 609 if ($$ != NULL) 610 check_expr_misc($2, false, false, false, false, false, true); 611 } 612 | T_SIZEOF T_LPAREN type_name T_RPAREN { 613 $$ = build_sizeof($3); 614 } 615 /* K&R ---, C90 ---, C99 ---, C11 6.5.3 */ 616 | T_ALIGNOF T_LPAREN type_name T_RPAREN { 617 $$ = build_alignof($3); 618 } 619 ; 620 621 /* The rule 'unary_operator' is inlined into unary_expression. */ 622 623 /* K&R 7.2, C90 ???, C99 6.5.4, C11 6.5.4 */ 624 cast_expression: 625 unary_expression 626 | T_LPAREN type_name T_RPAREN cast_expression { 627 $$ = cast($4, $2); 628 } 629 ; 630 631 expression_opt: 632 /* empty */ { 633 $$ = NULL; 634 } 635 | expression 636 ; 637 638 /* 'expression' also implements 'multiplicative_expression'. */ 639 /* 'expression' also implements 'additive_expression'. */ 640 /* 'expression' also implements 'shift_expression'. */ 641 /* 'expression' also implements 'relational_expression'. */ 642 /* 'expression' also implements 'equality_expression'. */ 643 /* 'expression' also implements 'AND_expression'. */ 644 /* 'expression' also implements 'exclusive_OR_expression'. */ 645 /* 'expression' also implements 'inclusive_OR_expression'. */ 646 /* 'expression' also implements 'logical_AND_expression'. */ 647 /* 'expression' also implements 'logical_OR_expression'. */ 648 /* 'expression' also implements 'conditional_expression'. */ 649 /* 'expression' also implements 'assignment_expression'. */ 650 /* K&R ???, C90 ???, C99 6.5.5 to 6.5.17, C11 ??? */ 651 expression: 652 expression T_ASTERISK expression { 653 $$ = build(MULT, $1, $3); 654 } 655 | expression T_MULTIPLICATIVE expression { 656 $$ = build($2, $1, $3); 657 } 658 | expression T_ADDITIVE expression { 659 $$ = build($2, $1, $3); 660 } 661 | expression T_SHIFT expression { 662 $$ = build($2, $1, $3); 663 } 664 | expression T_RELATIONAL expression { 665 $$ = build($2, $1, $3); 666 } 667 | expression T_EQUALITY expression { 668 $$ = build($2, $1, $3); 669 } 670 | expression T_AMPER expression { 671 $$ = build(BITAND, $1, $3); 672 } 673 | expression T_BITXOR expression { 674 $$ = build(BITXOR, $1, $3); 675 } 676 | expression T_BITOR expression { 677 $$ = build(BITOR, $1, $3); 678 } 679 | expression T_LOGAND expression { 680 $$ = build(LOGAND, $1, $3); 681 } 682 | expression T_LOGOR expression { 683 $$ = build(LOGOR, $1, $3); 684 } 685 | expression T_QUEST expression T_COLON expression { 686 $$ = build(QUEST, $1, build(COLON, $3, $5)); 687 } 688 | expression T_ASSIGN expression { 689 $$ = build(ASSIGN, $1, $3); 690 } 691 | expression T_OPASSIGN expression { 692 $$ = build($2, $1, $3); 693 } 694 | expression T_COMMA expression { 695 $$ = build(COMMA, $1, $3); 696 } 697 | cast_expression 698 ; 699 700 /* K&R ???, C90 ???, C99 6.5.16, C11 ??? */ 701 assignment_expression: 702 expression %prec T_ASSIGN 703 ; 704 705 constant_expr_list_opt: /* helper for gcc_attribute */ 706 /* empty */ 707 | constant_expr_list 708 ; 709 710 constant_expr_list: /* helper for gcc_attribute */ 711 constant_expr 712 | constant_expr_list T_COMMA constant_expr 713 ; 714 715 constant_expr: /* C99 6.6 */ 716 expression %prec T_ASSIGN 717 ; 718 719 declaration: /* C99 6.7 */ 720 begin_type_declmods end_type T_SEMI { 721 if (dcs->d_scl == TYPEDEF) { 722 /* typedef declares no type name */ 723 warning(72); 724 } else { 725 /* empty declaration */ 726 warning(2); 727 } 728 } 729 | begin_type_declmods end_type notype_init_decls T_SEMI 730 | begin_type_declaration_specifiers end_type T_SEMI { 731 if (dcs->d_scl == TYPEDEF) { 732 /* typedef declares no type name */ 733 warning(72); 734 } else if (!dcs->d_nonempty_decl) { 735 /* empty declaration */ 736 warning(2); 737 } 738 } 739 | begin_type_declaration_specifiers end_type type_init_decls T_SEMI 740 | error T_SEMI 741 ; 742 743 begin_type_declaration_specifiers: /* see C99 6.7 */ 744 begin_type_typespec { 745 add_type($1); 746 } 747 | begin_type_declmods type_specifier { 748 add_type($2); 749 } 750 | type_attribute begin_type_declaration_specifiers 751 | begin_type_declaration_specifiers declmod 752 | begin_type_declaration_specifiers notype_type_specifier { 753 add_type($2); 754 } 755 ; 756 757 begin_type_declmods: /* see C99 6.7 */ 758 begin_type T_QUAL { 759 add_qualifier($2); 760 } 761 | begin_type T_SCLASS { 762 add_storage_class($2); 763 } 764 | begin_type_declmods declmod 765 ; 766 767 begin_type_noclass_declspecs: 768 begin_type_typespec { 769 add_type($1); 770 } 771 | type_attribute begin_type_noclass_declspecs 772 | begin_type_noclass_declmods type_specifier { 773 add_type($2); 774 } 775 | begin_type_noclass_declspecs T_QUAL { 776 add_qualifier($2); 777 } 778 | begin_type_noclass_declspecs notype_type_specifier { 779 add_type($2); 780 } 781 | begin_type_noclass_declspecs type_attribute 782 ; 783 784 begin_type_typespec: 785 begin_type notype_type_specifier { 786 $$ = $2; 787 } 788 | T_TYPENAME begin_type { 789 $$ = getsym($1)->s_type; 790 } 791 ; 792 793 begin_type_noclass_declmods: 794 begin_type T_QUAL { 795 add_qualifier($2); 796 } 797 | begin_type_noclass_declmods T_QUAL { 798 add_qualifier($2); 799 } 800 ; 801 802 declmod: 803 T_QUAL { 804 add_qualifier($1); 805 } 806 | T_SCLASS { 807 add_storage_class($1); 808 } 809 | type_attribute_list 810 ; 811 812 type_attribute_list: 813 type_attribute 814 | type_attribute_list type_attribute 815 ; 816 817 type_attribute_opt: 818 /* empty */ 819 | type_attribute 820 ; 821 822 type_attribute: /* See C11 6.7 declaration-specifiers */ 823 T_ATTRIBUTE T_LPAREN T_LPAREN { 824 attron = true; 825 } gcc_attribute_spec_list { 826 attron = false; 827 } T_RPAREN T_RPAREN 828 | T_ALIGNAS T_LPAREN align_as T_RPAREN 829 | T_PACKED { 830 addpacked(); 831 } 832 | T_NORETURN 833 ; 834 835 align_as: /* See alignment-specifier in C11 6.7.5 */ 836 type_specifier 837 | constant_expr 838 ; 839 840 begin_type: 841 /* empty */ { 842 begin_type(); 843 } 844 ; 845 846 end_type: 847 /* empty */ { 848 end_type(); 849 } 850 ; 851 852 type_specifier: /* C99 6.7.2 */ 853 notype_type_specifier 854 | T_TYPENAME { 855 $$ = getsym($1)->s_type; 856 } 857 ; 858 859 notype_type_specifier: /* see C99 6.7.2 */ 860 T_TYPE { 861 $$ = gettyp($1); 862 } 863 | T_TYPEOF cast_expression { /* GCC extension */ 864 $$ = $2->tn_type; 865 } 866 | struct_or_union_specifier { 867 end_declaration_level(); 868 $$ = $1; 869 } 870 | enum_specifier { 871 end_declaration_level(); 872 $$ = $1; 873 } 874 ; 875 876 struct_or_union_specifier: /* C99 6.7.2.1 */ 877 struct_or_union identifier_sym { 878 /* 879 * STDC requires that "struct a;" always introduces 880 * a new tag if "a" is not declared at current level 881 * 882 * yychar is valid because otherwise the parser would not 883 * have been able to decide if it must shift or reduce 884 */ 885 $$ = mktag($2, $1, false, yychar == T_SEMI); 886 } 887 | struct_or_union identifier_sym { 888 dcs->d_tagtyp = mktag($2, $1, true, false); 889 } braced_struct_declaration_list { 890 $$ = complete_tag_struct_or_union(dcs->d_tagtyp, $4); 891 } 892 | struct_or_union { 893 dcs->d_tagtyp = mktag(NULL, $1, true, false); 894 } braced_struct_declaration_list { 895 $$ = complete_tag_struct_or_union(dcs->d_tagtyp, $3); 896 } 897 | struct_or_union error { 898 symtyp = FVFT; 899 $$ = gettyp(INT); 900 } 901 ; 902 903 struct_or_union: /* C99 6.7.2.1 */ 904 struct_or_union type_attribute 905 | T_STRUCT_OR_UNION { 906 symtyp = FTAG; 907 begin_declaration_level($1 == STRUCT ? MOS : MOU); 908 dcs->d_offset = 0; 909 dcs->d_sou_align_in_bits = CHAR_SIZE; 910 $$ = $1; 911 } 912 ; 913 914 braced_struct_declaration_list: /* see C99 6.7.2.1 */ 915 struct_declaration_lbrace struct_declaration_list_with_rbrace { 916 $$ = $2; 917 } 918 ; 919 920 struct_declaration_lbrace: /* see C99 6.7.2.1 */ 921 T_LBRACE { 922 symtyp = FVFT; 923 } 924 ; 925 926 struct_declaration_list_with_rbrace: /* see C99 6.7.2.1 */ 927 struct_declaration_list T_SEMI T_RBRACE 928 | struct_declaration_list T_RBRACE { 929 if (sflag) { 930 /* syntax req. ';' after last struct/union member */ 931 error(66); 932 } else { 933 /* syntax req. ';' after last struct/union member */ 934 warning(66); 935 } 936 $$ = $1; 937 } 938 | T_RBRACE { 939 $$ = NULL; 940 } 941 ; 942 943 struct_declaration_list: /* C99 6.7.2.1 */ 944 struct_declaration 945 | struct_declaration_list T_SEMI struct_declaration { 946 $$ = lnklst($1, $3); 947 } 948 ; 949 950 struct_declaration: /* C99 6.7.2.1 */ 951 begin_type_noclass_declmods end_type { 952 /* too late, i know, but getsym() compensates it */ 953 symtyp = FMEMBER; 954 } notype_member_decls type_attribute_opt { 955 symtyp = FVFT; 956 $$ = $4; 957 } 958 | begin_type_noclass_declspecs end_type { 959 symtyp = FMEMBER; 960 } type_member_decls type_attribute_opt { 961 symtyp = FVFT; 962 $$ = $4; 963 } 964 | begin_type_noclass_declmods end_type type_attribute_opt { 965 /* syntax error '%s' */ 966 error(249, "member without type"); 967 $$ = NULL; 968 } 969 | begin_type_noclass_declspecs end_type type_attribute_opt { 970 symtyp = FVFT; 971 if (!Sflag) 972 /* anonymous struct/union members is a C9X feature */ 973 warning(49); 974 if (is_struct_or_union(dcs->d_type->t_tspec)) { 975 $$ = dcs->d_type->t_str->sou_first_member; 976 /* add all the members of the anonymous struct/union */ 977 anonymize($$); 978 } else { 979 /* syntax error '%s' */ 980 error(249, "unnamed member"); 981 $$ = NULL; 982 } 983 } 984 | error { 985 symtyp = FVFT; 986 $$ = NULL; 987 } 988 ; 989 990 /* TODO: rename 'decls' to 'declarators', everywhere. */ 991 notype_member_decls: 992 notype_member_decl { 993 $$ = declarator_1_struct_union($1); 994 } 995 | notype_member_decls { 996 symtyp = FMEMBER; 997 } T_COMMA type_member_decl { 998 $$ = lnklst($1, declarator_1_struct_union($4)); 999 } 1000 ; 1001 1002 type_member_decls: 1003 type_member_decl { 1004 $$ = declarator_1_struct_union($1); 1005 } 1006 | type_member_decls { 1007 symtyp = FMEMBER; 1008 } T_COMMA type_member_decl { 1009 $$ = lnklst($1, declarator_1_struct_union($4)); 1010 } 1011 ; 1012 1013 notype_member_decl: 1014 notype_decl 1015 | notype_decl T_COLON constant_expr { /* C99 6.7.2.1 */ 1016 $$ = bitfield($1, to_int_constant($3, true)); 1017 } 1018 | { 1019 symtyp = FVFT; 1020 } T_COLON constant_expr { /* C99 6.7.2.1 */ 1021 $$ = bitfield(NULL, to_int_constant($3, true)); 1022 } 1023 ; 1024 1025 type_member_decl: 1026 type_decl 1027 | type_decl T_COLON constant_expr { 1028 $$ = bitfield($1, to_int_constant($3, true)); 1029 } 1030 | { 1031 symtyp = FVFT; 1032 } T_COLON constant_expr { 1033 $$ = bitfield(NULL, to_int_constant($3, true)); 1034 } 1035 ; 1036 1037 enum_specifier: /* C99 6.7.2.2 */ 1038 enum identifier_sym { 1039 $$ = mktag($2, ENUM, false, false); 1040 } 1041 | enum identifier_sym { 1042 dcs->d_tagtyp = mktag($2, ENUM, true, false); 1043 } enum_declaration { 1044 $$ = complete_tag_enum(dcs->d_tagtyp, $4); 1045 } 1046 | enum { 1047 dcs->d_tagtyp = mktag(NULL, ENUM, true, false); 1048 } enum_declaration { 1049 $$ = complete_tag_enum(dcs->d_tagtyp, $3); 1050 } 1051 | enum error { 1052 symtyp = FVFT; 1053 $$ = gettyp(INT); 1054 } 1055 ; 1056 1057 enum: /* helper for C99 6.7.2.2 */ 1058 T_ENUM { 1059 symtyp = FTAG; 1060 begin_declaration_level(CTCONST); 1061 } 1062 ; 1063 1064 enum_declaration: /* helper for C99 6.7.2.2 */ 1065 enum_decl_lbrace enums_with_opt_comma T_RBRACE { 1066 $$ = $2; 1067 } 1068 ; 1069 1070 enum_decl_lbrace: /* helper for C99 6.7.2.2 */ 1071 T_LBRACE { 1072 symtyp = FVFT; 1073 enumval = 0; 1074 } 1075 ; 1076 1077 enums_with_opt_comma: /* helper for C99 6.7.2.2 */ 1078 enumerator_list 1079 | enumerator_list T_COMMA { 1080 if (sflag) { 1081 /* trailing ',' prohibited in enum declaration */ 1082 error(54); 1083 } else { 1084 /* trailing ',' prohibited in enum declaration */ 1085 c99ism(54); 1086 } 1087 $$ = $1; 1088 } 1089 ; 1090 1091 enumerator_list: /* C99 6.7.2.2 */ 1092 enumerator 1093 | enumerator_list T_COMMA enumerator { 1094 $$ = lnklst($1, $3); 1095 } 1096 | error { 1097 $$ = NULL; 1098 } 1099 ; 1100 1101 enumerator: /* C99 6.7.2.2 */ 1102 identifier_sym { 1103 $$ = enumeration_constant($1, enumval, true); 1104 } 1105 | identifier_sym T_ASSIGN constant_expr { 1106 $$ = enumeration_constant($1, to_int_constant($3, true), false); 1107 } 1108 ; 1109 1110 type_qualifier: /* C99 6.7.3 */ 1111 T_QUAL { 1112 $$ = xcalloc(1, sizeof(*$$)); 1113 if ($1 == CONST) { 1114 $$->p_const = true; 1115 } else if ($1 == VOLATILE) { 1116 $$->p_volatile = true; 1117 } else { 1118 lint_assert($1 == RESTRICT || $1 == THREAD); 1119 } 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 $$ = merge_qualified_pointer($1, $2); 1151 } 1152 ; 1153 1154 /* 1155 * For an explanation of 'notype' in the following rules, see the Bison 1156 * manual, section 7.1 "Semantic Info in Token Kinds". 1157 */ 1158 1159 notype_init_decls: 1160 notype_init_decl 1161 | notype_init_decls T_COMMA type_init_decl 1162 ; 1163 1164 type_init_decls: 1165 type_init_decl 1166 | type_init_decls T_COMMA type_init_decl 1167 ; 1168 1169 notype_init_decl: 1170 notype_decl asm_or_symbolrename_opt { 1171 cgram_declare($1, false, $2); 1172 check_size($1); 1173 } 1174 | notype_decl asm_or_symbolrename_opt { 1175 begin_initialization($1); 1176 cgram_declare($1, true, $2); 1177 } T_ASSIGN initializer { 1178 check_size($1); 1179 end_initialization(); 1180 } 1181 ; 1182 1183 type_init_decl: 1184 type_decl asm_or_symbolrename_opt { 1185 cgram_declare($1, false, $2); 1186 check_size($1); 1187 } 1188 | type_decl asm_or_symbolrename_opt { 1189 begin_initialization($1); 1190 cgram_declare($1, true, $2); 1191 } T_ASSIGN initializer { 1192 check_size($1); 1193 end_initialization(); 1194 } 1195 ; 1196 1197 notype_decl: 1198 notype_direct_decl 1199 | pointer notype_direct_decl { 1200 $$ = add_pointer($2, $1); 1201 } 1202 ; 1203 1204 type_decl: 1205 type_direct_decl 1206 | pointer type_direct_decl { 1207 $$ = add_pointer($2, $1); 1208 } 1209 ; 1210 1211 notype_direct_decl: 1212 T_NAME { 1213 $$ = declarator_name(getsym($1)); 1214 } 1215 | T_LPAREN type_decl T_RPAREN { 1216 $$ = $2; 1217 } 1218 | type_attribute notype_direct_decl { 1219 $$ = $2; 1220 } 1221 | notype_direct_decl T_LBRACK T_RBRACK { 1222 $$ = add_array($1, false, 0); 1223 } 1224 | notype_direct_decl T_LBRACK array_size T_RBRACK { 1225 $$ = add_array($1, true, to_int_constant($3, false)); 1226 } 1227 | notype_direct_decl param_list asm_or_symbolrename_opt { 1228 $$ = add_function(symbolrename($1, $3), $2); 1229 end_declaration_level(); 1230 block_level--; 1231 } 1232 | notype_direct_decl type_attribute 1233 ; 1234 1235 type_direct_decl: 1236 identifier { 1237 $$ = declarator_name(getsym($1)); 1238 } 1239 | T_LPAREN type_decl T_RPAREN { 1240 $$ = $2; 1241 } 1242 | type_attribute type_direct_decl { 1243 $$ = $2; 1244 } 1245 | type_direct_decl T_LBRACK T_RBRACK { 1246 $$ = add_array($1, false, 0); 1247 } 1248 | type_direct_decl T_LBRACK array_size T_RBRACK { 1249 $$ = add_array($1, true, to_int_constant($3, false)); 1250 } 1251 | type_direct_decl param_list asm_or_symbolrename_opt { 1252 $$ = add_function(symbolrename($1, $3), $2); 1253 end_declaration_level(); 1254 block_level--; 1255 } 1256 | type_direct_decl type_attribute 1257 ; 1258 1259 /* 1260 * The two distinct rules type_param_decl and notype_param_decl avoid a 1261 * conflict in argument lists. A typename enclosed in parentheses is always 1262 * treated as a typename, not an argument name. For example, after 1263 * "typedef double a;", the declaration "f(int (a));" is interpreted as 1264 * "f(int (double));", not "f(int a);". 1265 */ 1266 type_param_decl: 1267 direct_param_decl 1268 | pointer direct_param_decl { 1269 $$ = add_pointer($2, $1); 1270 } 1271 ; 1272 1273 notype_param_decl: 1274 direct_notype_param_decl 1275 | pointer direct_notype_param_decl { 1276 $$ = add_pointer($2, $1); 1277 } 1278 ; 1279 1280 direct_param_decl: 1281 identifier type_attribute_list { 1282 $$ = declarator_name(getsym($1)); 1283 } 1284 | identifier { 1285 $$ = declarator_name(getsym($1)); 1286 } 1287 | T_LPAREN notype_param_decl T_RPAREN { 1288 $$ = $2; 1289 } 1290 | direct_param_decl T_LBRACK T_RBRACK { 1291 $$ = add_array($1, false, 0); 1292 } 1293 | direct_param_decl T_LBRACK array_size T_RBRACK { 1294 $$ = add_array($1, true, to_int_constant($3, false)); 1295 } 1296 | direct_param_decl param_list asm_or_symbolrename_opt { 1297 $$ = add_function(symbolrename($1, $3), $2); 1298 end_declaration_level(); 1299 block_level--; 1300 } 1301 ; 1302 1303 direct_notype_param_decl: 1304 identifier { 1305 $$ = declarator_name(getsym($1)); 1306 } 1307 | T_LPAREN notype_param_decl T_RPAREN { 1308 $$ = $2; 1309 } 1310 | direct_notype_param_decl T_LBRACK T_RBRACK { 1311 $$ = add_array($1, false, 0); 1312 } 1313 | direct_notype_param_decl T_LBRACK array_size T_RBRACK { 1314 $$ = add_array($1, true, to_int_constant($3, false)); 1315 } 1316 | direct_notype_param_decl param_list asm_or_symbolrename_opt { 1317 $$ = 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 $$ = $2->s_type; 1366 } 1367 ; 1368 1369 abstract_declaration: 1370 begin_type_noclass_declmods end_type { 1371 $$ = declare_1_abstract(abstract_name()); 1372 } 1373 | begin_type_noclass_declspecs end_type { 1374 $$ = declare_1_abstract(abstract_name()); 1375 } 1376 | begin_type_noclass_declmods end_type abstract_declarator { 1377 $$ = declare_1_abstract($3); 1378 } 1379 | begin_type_noclass_declspecs end_type abstract_declarator { 1380 $$ = declare_1_abstract($3); 1381 } 1382 ; 1383 1384 abstract_declarator: /* C99 6.7.6 */ 1385 pointer { 1386 $$ = add_pointer(abstract_name(), $1); 1387 } 1388 | direct_abstract_declarator 1389 | pointer direct_abstract_declarator { 1390 $$ = add_pointer($2, $1); 1391 } 1392 | T_TYPEOF cast_expression { /* GCC extension */ 1393 $$ = mktempsym($2->tn_type); 1394 } 1395 ; 1396 1397 direct_abstract_declarator: /* C99 6.7.6 */ 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 $$ = add_array(abstract_name(), true, to_int_constant($2, false)); 1406 } 1407 | type_attribute direct_abstract_declarator { 1408 $$ = $2; 1409 } 1410 | direct_abstract_declarator T_LBRACK T_RBRACK { 1411 $$ = add_array($1, false, 0); 1412 } 1413 | direct_abstract_declarator T_LBRACK T_ASTERISK T_RBRACK { /* C99 */ 1414 $$ = add_array($1, false, 0); 1415 } 1416 | direct_abstract_declarator T_LBRACK array_size T_RBRACK { 1417 $$ = add_array($1, true, to_int_constant($3, false)); 1418 } 1419 | abstract_decl_param_list asm_or_symbolrename_opt { 1420 $$ = add_function(symbolrename(abstract_name(), $2), $1); 1421 end_declaration_level(); 1422 block_level--; 1423 } 1424 | direct_abstract_declarator abstract_decl_param_list asm_or_symbolrename_opt { 1425 $$ = add_function(symbolrename($1, $3), $2); 1426 end_declaration_level(); 1427 block_level--; 1428 } 1429 | direct_abstract_declarator type_attribute_list 1430 ; 1431 1432 abstract_decl_param_list: 1433 abstract_decl_lparen T_RPAREN type_attribute_opt { 1434 $$ = NULL; 1435 } 1436 | abstract_decl_lparen vararg_parameter_type_list T_RPAREN type_attribute_opt { 1437 dcs->d_proto = true; 1438 $$ = $2; 1439 } 1440 | abstract_decl_lparen error T_RPAREN type_attribute_opt { 1441 $$ = NULL; 1442 } 1443 ; 1444 1445 abstract_decl_lparen: 1446 T_LPAREN { 1447 block_level++; 1448 begin_declaration_level(PROTO_ARG); 1449 } 1450 ; 1451 1452 vararg_parameter_type_list: 1453 parameter_type_list 1454 | parameter_type_list T_COMMA T_ELLIPSIS { 1455 dcs->d_vararg = true; 1456 $$ = $1; 1457 } 1458 | T_ELLIPSIS { 1459 if (sflag) { 1460 /* ANSI C requires formal parameter before '...' */ 1461 error(84); 1462 } else if (!tflag) { 1463 /* ANSI C requires formal parameter before '...' */ 1464 warning(84); 1465 } 1466 dcs->d_vararg = true; 1467 $$ = NULL; 1468 } 1469 ; 1470 1471 /* XXX: C99 6.7.5 defines the same name, but it looks different. */ 1472 parameter_type_list: 1473 parameter_declaration 1474 | parameter_type_list T_COMMA parameter_declaration { 1475 $$ = lnklst($1, $3); 1476 } 1477 ; 1478 1479 /* XXX: C99 6.7.5 defines the same name, but it looks completely different. */ 1480 parameter_declaration: 1481 begin_type_declmods end_type { 1482 $$ = declare_argument(abstract_name(), false); 1483 } 1484 | begin_type_declaration_specifiers end_type { 1485 $$ = declare_argument(abstract_name(), false); 1486 } 1487 | begin_type_declmods end_type notype_param_decl { 1488 $$ = declare_argument($3, false); 1489 } 1490 /* 1491 * type_param_decl 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_decl { 1498 $$ = declare_argument($3, false); 1499 } 1500 | begin_type_declmods end_type abstract_declarator { 1501 $$ = declare_argument($3, false); 1502 } 1503 | begin_type_declaration_specifiers end_type abstract_declarator { 1504 $$ = declare_argument($3, false); 1505 } 1506 ; 1507 1508 initializer: /* C99 6.7.8 "Initialization" */ 1509 expression %prec T_COMMA { 1510 init_expr($1); 1511 } 1512 | init_lbrace init_rbrace { 1513 /* XXX: Empty braces are not covered by C99 6.7.8. */ 1514 } 1515 | init_lbrace initializer_list comma_opt init_rbrace 1516 | error 1517 ; 1518 1519 initializer_list: /* C99 6.7.8 "Initialization" */ 1520 initializer_list_item 1521 | initializer_list T_COMMA initializer_list_item 1522 ; 1523 1524 initializer_list_item: /* helper */ 1525 designation initializer 1526 | initializer 1527 ; 1528 1529 designation: /* C99 6.7.8 "Initialization" */ 1530 designator_list T_ASSIGN 1531 | identifier T_COLON { 1532 /* GCC style struct or union member name in initializer */ 1533 gnuism(315); 1534 add_designator_member($1); 1535 } 1536 ; 1537 1538 designator_list: /* C99 6.7.8 "Initialization" */ 1539 designator 1540 | designator_list designator 1541 ; 1542 1543 designator: /* C99 6.7.8 "Initialization" */ 1544 T_LBRACK range T_RBRACK { 1545 add_designator_subscript($2); 1546 if (!Sflag) 1547 /* array initializer with des.s is a C9X feature */ 1548 warning(321); 1549 } 1550 | T_POINT identifier { 1551 if (!Sflag) 1552 /* struct or union member name in initializer is ... */ 1553 warning(313); 1554 add_designator_member($2); 1555 } 1556 ; 1557 1558 range: 1559 constant_expr { 1560 $$.lo = to_int_constant($1, true); 1561 $$.hi = $$.lo; 1562 } 1563 | constant_expr T_ELLIPSIS constant_expr { 1564 $$.lo = to_int_constant($1, true); 1565 $$.hi = to_int_constant($3, true); 1566 /* initialization with '[a...b]' is a GCC extension */ 1567 gnuism(340); 1568 } 1569 ; 1570 1571 init_lbrace: /* helper */ 1572 T_LBRACE { 1573 init_lbrace(); 1574 } 1575 ; 1576 1577 init_rbrace: /* helper */ 1578 T_RBRACE { 1579 init_rbrace(); 1580 } 1581 ; 1582 1583 asm_or_symbolrename_opt: /* GCC extensions */ 1584 /* empty */ { 1585 $$ = NULL; 1586 } 1587 | T_ASM T_LPAREN T_STRING T_RPAREN { 1588 freeyyv(&$3, T_STRING); 1589 $$ = NULL; 1590 } 1591 | T_SYMBOLRENAME T_LPAREN T_NAME T_RPAREN { 1592 $$ = $3; 1593 } 1594 ; 1595 1596 statement: /* C99 6.8 */ 1597 expression_statement 1598 | non_expr_statement 1599 ; 1600 1601 non_expr_statement: /* helper for C99 6.8 */ 1602 type_attribute T_SEMI 1603 | labeled_statement 1604 | compound_statement 1605 | selection_statement 1606 | iteration_statement 1607 | jump_statement { 1608 seen_fallthrough = false; 1609 } 1610 | asm_statement 1611 ; 1612 1613 labeled_statement: /* C99 6.8.1 */ 1614 label type_attribute_opt statement 1615 ; 1616 1617 label: 1618 T_NAME T_COLON { 1619 symtyp = FLABEL; 1620 named_label(getsym($1)); 1621 } 1622 | T_CASE constant_expr T_COLON { 1623 case_label($2); 1624 seen_fallthrough = true; 1625 } 1626 | T_CASE constant_expr T_ELLIPSIS constant_expr T_COLON { 1627 /* XXX: We don't fill all cases */ 1628 case_label($2); 1629 seen_fallthrough = true; 1630 } 1631 | T_DEFAULT T_COLON { 1632 default_label(); 1633 seen_fallthrough = true; 1634 } 1635 ; 1636 1637 compound_statement: /* C99 6.8.2 */ 1638 compound_statement_lbrace compound_statement_rbrace 1639 | compound_statement_lbrace block_item_list compound_statement_rbrace 1640 ; 1641 1642 compound_statement_lbrace: 1643 T_LBRACE { 1644 block_level++; 1645 mem_block_level++; 1646 begin_declaration_level(AUTO); 1647 } 1648 ; 1649 1650 compound_statement_rbrace: 1651 T_RBRACE { 1652 end_declaration_level(); 1653 freeblk(); 1654 mem_block_level--; 1655 block_level--; 1656 seen_fallthrough = false; 1657 } 1658 ; 1659 1660 block_item_list: /* C99 6.8.2 */ 1661 block_item 1662 | block_item_list block_item { 1663 if (!Sflag && $1 && !$2) 1664 /* declarations after statements is a C99 feature */ 1665 c99ism(327); 1666 $$ = $1 || $2; 1667 } 1668 ; 1669 1670 block_item: /* C99 6.8.2 */ 1671 declaration { 1672 $$ = false; 1673 restore_warning_flags(); 1674 } 1675 | statement { 1676 $$ = true; 1677 restore_warning_flags(); 1678 } 1679 ; 1680 1681 expression_statement: /* C99 6.8.3 */ 1682 expression T_SEMI { 1683 expr($1, false, false, false, false); 1684 seen_fallthrough = false; 1685 } 1686 | T_SEMI { 1687 seen_fallthrough = false; 1688 } 1689 ; 1690 1691 selection_statement: /* C99 6.8.4 */ 1692 if_without_else %prec T_THEN { 1693 save_warning_flags(); 1694 if2(); 1695 if3(false); 1696 } 1697 | if_without_else T_ELSE { 1698 save_warning_flags(); 1699 if2(); 1700 } statement { 1701 clear_warning_flags(); 1702 if3(true); 1703 } 1704 | if_without_else T_ELSE error { 1705 clear_warning_flags(); 1706 if3(false); 1707 } 1708 | switch_expr statement { 1709 clear_warning_flags(); 1710 switch2(); 1711 } 1712 | switch_expr error { 1713 clear_warning_flags(); 1714 switch2(); 1715 } 1716 ; 1717 1718 if_without_else: /* see C99 6.8.4 */ 1719 if_expr statement 1720 | if_expr error 1721 ; 1722 1723 if_expr: /* see C99 6.8.4 */ 1724 T_IF T_LPAREN expression T_RPAREN { 1725 if1($3); 1726 clear_warning_flags(); 1727 } 1728 ; 1729 1730 switch_expr: /* see C99 6.8.4 */ 1731 T_SWITCH T_LPAREN expression T_RPAREN { 1732 switch1($3); 1733 clear_warning_flags(); 1734 } 1735 ; 1736 1737 iteration_statement: /* C99 6.8.5 */ 1738 while_expr statement { 1739 clear_warning_flags(); 1740 while2(); 1741 } 1742 | while_expr error { 1743 clear_warning_flags(); 1744 while2(); 1745 } 1746 | do_statement do_while_expr { 1747 do2($2); 1748 seen_fallthrough = false; 1749 } 1750 | do error { 1751 clear_warning_flags(); 1752 do2(NULL); 1753 } 1754 | for_exprs statement { 1755 clear_warning_flags(); 1756 for2(); 1757 end_declaration_level(); 1758 block_level--; 1759 } 1760 | for_exprs error { 1761 clear_warning_flags(); 1762 for2(); 1763 end_declaration_level(); 1764 block_level--; 1765 } 1766 ; 1767 1768 while_expr: /* see C99 6.8.5 */ 1769 T_WHILE T_LPAREN expression T_RPAREN { 1770 while1($3); 1771 clear_warning_flags(); 1772 } 1773 ; 1774 1775 do_statement: /* see C99 6.8.5 */ 1776 do statement { 1777 clear_warning_flags(); 1778 } 1779 ; 1780 1781 do: /* see C99 6.8.5 */ 1782 T_DO { 1783 do1(); 1784 } 1785 ; 1786 1787 do_while_expr: /* see C99 6.8.5 */ 1788 T_WHILE T_LPAREN expression T_RPAREN T_SEMI { 1789 $$ = $3; 1790 } 1791 ; 1792 1793 for_start: /* see C99 6.8.5 */ 1794 T_FOR T_LPAREN { 1795 begin_declaration_level(AUTO); 1796 block_level++; 1797 } 1798 ; 1799 1800 for_exprs: /* see C99 6.8.5 */ 1801 for_start 1802 begin_type_declaration_specifiers end_type 1803 notype_init_decls T_SEMI 1804 expression_opt T_SEMI expression_opt T_RPAREN { 1805 /* variable declaration in for loop */ 1806 c99ism(325); 1807 for1(NULL, $6, $8); 1808 clear_warning_flags(); 1809 } 1810 | for_start 1811 expression_opt T_SEMI 1812 expression_opt T_SEMI 1813 expression_opt T_RPAREN { 1814 for1($2, $4, $6); 1815 clear_warning_flags(); 1816 } 1817 ; 1818 1819 jump_statement: /* C99 6.8.6 */ 1820 goto identifier T_SEMI { 1821 do_goto(getsym($2)); 1822 } 1823 | goto error T_SEMI { 1824 symtyp = FVFT; 1825 } 1826 | T_CONTINUE T_SEMI { 1827 do_continue(); 1828 } 1829 | T_BREAK T_SEMI { 1830 do_break(); 1831 } 1832 | T_RETURN T_SEMI { 1833 do_return(NULL); 1834 } 1835 | T_RETURN expression T_SEMI { 1836 do_return($2); 1837 } 1838 ; 1839 1840 goto: /* see C99 6.8.6 */ 1841 T_GOTO { 1842 symtyp = FLABEL; 1843 } 1844 ; 1845 1846 asm_statement: /* GCC extension */ 1847 T_ASM T_LPAREN read_until_rparen T_SEMI { 1848 setasm(); 1849 } 1850 | T_ASM T_QUAL T_LPAREN read_until_rparen T_SEMI { 1851 setasm(); 1852 } 1853 | T_ASM error 1854 ; 1855 1856 read_until_rparen: /* helper for 'asm_statement' */ 1857 /* empty */ { 1858 ignore_up_to_rparen(); 1859 } 1860 ; 1861 1862 translation_unit: /* C99 6.9 */ 1863 external_declaration 1864 | translation_unit external_declaration 1865 ; 1866 1867 external_declaration: /* C99 6.9 */ 1868 asm_statement 1869 | function_definition { 1870 global_clean_up_decl(false); 1871 clear_warning_flags(); 1872 } 1873 | top_level_declaration { 1874 global_clean_up_decl(false); 1875 clear_warning_flags(); 1876 } 1877 ; 1878 1879 /* 1880 * On the top level, lint allows several forms of declarations that it doesn't 1881 * allow in functions. For example, a single ';' is an empty declaration and 1882 * is supported by some compilers, but in a function it would be an empty 1883 * statement, not a declaration. This makes a difference in C90 mode, where 1884 * a statement must not be followed by a declaration. 1885 * 1886 * See 'declaration' for all other declarations. 1887 */ 1888 top_level_declaration: /* C99 6.9 calls this 'declaration' */ 1889 T_SEMI { 1890 if (sflag) { 1891 /* empty declaration */ 1892 error(0); 1893 } else if (!tflag) { 1894 /* empty declaration */ 1895 warning(0); 1896 } 1897 } 1898 | begin_type end_type notype_init_decls T_SEMI { 1899 if (sflag) { 1900 /* old style declaration; add 'int' */ 1901 error(1); 1902 } else if (!tflag) { 1903 /* old style declaration; add 'int' */ 1904 warning(1); 1905 } 1906 } 1907 | begin_type_declmods end_type T_SEMI { 1908 if (dcs->d_scl == TYPEDEF) { 1909 /* typedef declares no type name */ 1910 warning(72); 1911 } else { 1912 /* empty declaration */ 1913 warning(2); 1914 } 1915 } 1916 | begin_type_declmods end_type notype_init_decls T_SEMI 1917 | begin_type_declaration_specifiers end_type T_SEMI { 1918 if (dcs->d_scl == TYPEDEF) { 1919 /* typedef declares no type name */ 1920 warning(72); 1921 } else if (!dcs->d_nonempty_decl) { 1922 /* empty declaration */ 1923 warning(2); 1924 } 1925 } 1926 | begin_type_declaration_specifiers end_type type_init_decls T_SEMI 1927 | error T_SEMI { 1928 global_clean_up(); 1929 } 1930 | error T_RBRACE { 1931 global_clean_up(); 1932 } 1933 ; 1934 1935 function_definition: /* C99 6.9.1 */ 1936 func_decl { 1937 if ($1->s_type->t_tspec != FUNC) { 1938 /* syntax error '%s' */ 1939 error(249, yytext); 1940 YYERROR; 1941 } 1942 if ($1->s_type->t_typedef) { 1943 /* ()-less function definition */ 1944 error(64); 1945 YYERROR; 1946 } 1947 funcdef($1); 1948 block_level++; 1949 begin_declaration_level(ARG); 1950 if (lwarn == LWARN_NONE) 1951 $1->s_used = true; 1952 } arg_declaration_list_opt { 1953 end_declaration_level(); 1954 block_level--; 1955 check_func_lint_directives(); 1956 check_func_old_style_arguments(); 1957 begin_control_statement(CS_FUNCTION_BODY); 1958 } compound_statement { 1959 funcend(); 1960 end_control_statement(CS_FUNCTION_BODY); 1961 } 1962 ; 1963 1964 func_decl: 1965 begin_type end_type notype_decl { 1966 $$ = $3; 1967 } 1968 | begin_type_declmods end_type notype_decl { 1969 $$ = $3; 1970 } 1971 | begin_type_declaration_specifiers end_type type_decl { 1972 $$ = $3; 1973 } 1974 ; 1975 1976 arg_declaration_list_opt: /* C99 6.9.1p13 example 1 */ 1977 /* empty */ 1978 | arg_declaration_list 1979 ; 1980 1981 arg_declaration_list: /* C99 6.9.1p13 example 1 */ 1982 arg_declaration 1983 | arg_declaration_list arg_declaration 1984 /* XXX or better "arg_declaration error" ? */ 1985 | error 1986 ; 1987 1988 /* 1989 * "arg_declaration" is separated from "declaration" because it 1990 * needs other error handling. 1991 */ 1992 arg_declaration: 1993 begin_type_declmods end_type T_SEMI { 1994 /* empty declaration */ 1995 warning(2); 1996 } 1997 | begin_type_declmods end_type notype_init_decls T_SEMI 1998 | begin_type_declaration_specifiers end_type T_SEMI { 1999 if (!dcs->d_nonempty_decl) { 2000 /* empty declaration */ 2001 warning(2); 2002 } else { 2003 /* '%s' declared in argument declaration list */ 2004 warning(3, type_name(dcs->d_type)); 2005 } 2006 } 2007 | begin_type_declaration_specifiers end_type type_init_decls T_SEMI { 2008 if (dcs->d_nonempty_decl) { 2009 /* '%s' declared in argument declaration list */ 2010 warning(3, type_name(dcs->d_type)); 2011 } 2012 } 2013 | begin_type_declmods error 2014 | begin_type_declaration_specifiers error 2015 ; 2016 2017 gcc_attribute_spec_list: 2018 gcc_attribute_spec 2019 | gcc_attribute_spec_list T_COMMA gcc_attribute_spec 2020 ; 2021 2022 gcc_attribute_spec: 2023 /* empty */ 2024 | T_AT_ALWAYS_INLINE 2025 | T_AT_ALIAS T_LPAREN string T_RPAREN 2026 | T_AT_ALIGNED T_LPAREN constant_expr T_RPAREN 2027 | T_AT_ALIGNED 2028 | T_AT_ALLOC_SIZE T_LPAREN constant_expr T_COMMA constant_expr T_RPAREN 2029 | T_AT_ALLOC_SIZE T_LPAREN constant_expr T_RPAREN 2030 | T_AT_BOUNDED T_LPAREN gcc_attribute_bounded 2031 T_COMMA constant_expr T_COMMA constant_expr T_RPAREN 2032 | T_AT_COLD 2033 | T_AT_COMMON 2034 | T_AT_CONSTRUCTOR T_LPAREN constant_expr T_RPAREN 2035 | T_AT_CONSTRUCTOR 2036 | T_AT_DEPRECATED T_LPAREN string T_RPAREN 2037 | T_AT_DEPRECATED 2038 | T_AT_DESTRUCTOR T_LPAREN constant_expr T_RPAREN 2039 | T_AT_DESTRUCTOR 2040 | T_AT_FALLTHROUGH { 2041 fallthru(1); 2042 } 2043 | T_AT_FORMAT T_LPAREN gcc_attribute_format T_COMMA 2044 constant_expr T_COMMA constant_expr T_RPAREN 2045 | T_AT_FORMAT_ARG T_LPAREN constant_expr T_RPAREN 2046 | T_AT_GNU_INLINE 2047 | T_AT_HOT 2048 | T_AT_MALLOC 2049 | T_AT_MAY_ALIAS 2050 | T_AT_MODE T_LPAREN T_NAME T_RPAREN 2051 | T_AT_NOINLINE 2052 | T_AT_NONNULL T_LPAREN constant_expr_list_opt T_RPAREN 2053 | T_AT_NONNULL 2054 | T_AT_NONSTRING 2055 | T_AT_NORETURN 2056 | T_AT_NOTHROW 2057 | T_AT_NO_INSTRUMENT_FUNCTION 2058 | T_AT_OPTIMIZE T_LPAREN string T_RPAREN 2059 | T_AT_PACKED { 2060 addpacked(); 2061 } 2062 | T_AT_PCS T_LPAREN string T_RPAREN 2063 | T_AT_PURE 2064 | T_AT_RETURNS_TWICE 2065 | T_AT_SECTION T_LPAREN string T_RPAREN 2066 | T_AT_SENTINEL T_LPAREN constant_expr T_RPAREN 2067 | T_AT_SENTINEL 2068 | T_AT_TLS_MODEL T_LPAREN string T_RPAREN 2069 | T_AT_TUNION 2070 | T_AT_UNUSED { 2071 add_attr_used(); 2072 } 2073 | T_AT_USED { 2074 add_attr_used(); 2075 } 2076 | T_AT_VISIBILITY T_LPAREN constant_expr T_RPAREN 2077 | T_AT_WARN_UNUSED_RESULT 2078 | T_AT_WEAK 2079 | T_QUAL { 2080 if ($1 != CONST) 2081 yyerror("Bad attribute"); 2082 } 2083 ; 2084 2085 gcc_attribute_bounded: 2086 T_AT_MINBYTES 2087 | T_AT_STRING 2088 | T_AT_BUFFER 2089 ; 2090 2091 gcc_attribute_format: 2092 T_AT_FORMAT_GNU_PRINTF 2093 | T_AT_FORMAT_PRINTF 2094 | T_AT_FORMAT_SCANF 2095 | T_AT_FORMAT_STRFMON 2096 | T_AT_FORMAT_STRFTIME 2097 | T_AT_FORMAT_SYSLOG 2098 ; 2099 2100 %% 2101 2102 /* ARGSUSED */ 2103 int 2104 yyerror(const char *msg) 2105 { 2106 /* syntax error '%s' */ 2107 error(249, yytext); 2108 if (++sytxerr >= 5) 2109 norecover(); 2110 return 0; 2111 } 2112 2113 static void 2114 cgram_declare(sym_t *decl, bool initflg, sbuf_t *renaming) 2115 { 2116 declare(decl, initflg, renaming); 2117 if (renaming != NULL) 2118 freeyyv(&renaming, T_NAME); 2119 } 2120 2121 /* 2122 * Discard all input tokens up to and including the next 2123 * unmatched right paren 2124 */ 2125 static void 2126 ignore_up_to_rparen(void) 2127 { 2128 int level; 2129 2130 if (yychar < 0) 2131 yychar = yylex(); 2132 freeyyv(&yylval, yychar); 2133 2134 level = 1; 2135 while (yychar != T_RPAREN || --level > 0) { 2136 if (yychar == T_LPAREN) { 2137 level++; 2138 } else if (yychar <= 0) { 2139 break; 2140 } 2141 freeyyv(&yylval, yychar = yylex()); 2142 } 2143 2144 yyclearin; 2145 } 2146 2147 static sym_t * 2148 symbolrename(sym_t *s, sbuf_t *sb) 2149 { 2150 if (sb != NULL) 2151 s->s_rename = sb->sb_name; 2152 return s; 2153 } 2154
Indexes created Fri Oct 03 02:09:57 GMT 2025