cgram.y revision 1.316
1 %{ 2 /* $NetBSD: cgram.y,v 1.316 2021/07/11 20:25:54 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 1.316 2021/07/11 20:25:54 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_tnode> primary_expression 283 %type <y_tnode> postfix_expression 284 %type <y_tnode> argument_expression_list 285 %type <y_tnode> unary_expression 286 %type <y_tnode> cast_expression 287 %type <y_tnode> expr 288 289 %type <y_sym> func_decl 290 %type <y_sym> notype_decl 291 %type <y_sym> type_decl 292 %type <y_type> type_specifier 293 %type <y_type> begin_type_typespec 294 %type <y_type> notype_type_specifier 295 %type <y_type> struct_or_union_specifier 296 %type <y_type> enum_specifier 297 %type <y_tspec> struct_or_union 298 %type <y_sym> braced_struct_declaration_list 299 %type <y_sym> identifier_sym 300 %type <y_name> identifier 301 %type <y_sym> struct_declaration_list_with_rbrace 302 %type <y_sym> struct_declaration_list 303 %type <y_sym> struct_declaration 304 %type <y_sym> notype_member_decls 305 %type <y_sym> type_member_decls 306 %type <y_sym> notype_member_decl 307 %type <y_sym> type_member_decl 308 %type <y_tnode> constant_expr 309 %type <y_tnode> array_size 310 %type <y_sym> enum_declaration 311 %type <y_sym> enums_with_opt_comma 312 %type <y_sym> enumerator_list 313 %type <y_sym> enumerator 314 %type <y_sym> notype_direct_decl 315 %type <y_sym> type_direct_decl 316 %type <y_qual_ptr> pointer 317 %type <y_qual_ptr> asterisk 318 %type <y_sym> type_param_decl 319 %type <y_sym> param_list 320 %type <y_sym> abstract_decl_param_list 321 %type <y_sym> direct_param_decl 322 %type <y_sym> notype_param_decl 323 %type <y_sym> direct_notype_param_decl 324 %type <y_qual_ptr> type_qualifier_list_opt 325 %type <y_qual_ptr> type_qualifier_list 326 %type <y_qual_ptr> type_qualifier 327 %type <y_sym> identifier_list 328 %type <y_sym> abstract_declarator 329 %type <y_sym> direct_abstract_declarator 330 %type <y_sym> vararg_parameter_type_list 331 %type <y_sym> parameter_type_list 332 %type <y_sym> parameter_declaration 333 %type <y_tnode> assignment_expression 334 %type <y_tnode> gcc_statement_expr_list 335 %type <y_tnode> gcc_statement_expr_item 336 %type <y_tnode> generic_selection 337 %type <y_op> point_or_arrow 338 %type <y_type> type_name 339 %type <y_sym> abstract_declaration 340 %type <y_tnode> do_while_expr 341 %type <y_tnode> expr_opt 342 %type <y_string> string 343 %type <y_string> string2 344 %type <y_name> asm_or_symbolrename_opt 345 %type <y_range> range 346 %type <y_seen_statement> block_item_list 347 %type <y_seen_statement> block_item 348 %type <y_generic> generic_assoc_list 349 %type <y_generic> generic_association 350 351 %% 352 353 program: 354 /* empty */ { 355 if (sflag) { 356 /* empty translation unit */ 357 error(272); 358 } else if (!tflag) { 359 /* empty translation unit */ 360 warning(272); 361 } 362 } 363 | translation_unit 364 ; 365 366 translation_unit: /* C99 6.9 */ 367 external_declaration 368 | translation_unit external_declaration 369 ; 370 371 external_declaration: /* C99 6.9 */ 372 asm_statement 373 | function_definition { 374 global_clean_up_decl(false); 375 clear_warning_flags(); 376 } 377 | top_level_declaration { 378 global_clean_up_decl(false); 379 clear_warning_flags(); 380 } 381 ; 382 383 /* 384 * On the top level, lint allows several forms of declarations that it doesn't 385 * allow in functions. For example, a single ';' is an empty declaration and 386 * is supported by some compilers, but in a function it would be an empty 387 * statement, not a declaration. This makes a difference in C90 mode, where 388 * a statement must not be followed by a declaration. 389 * 390 * See 'declaration' for all other declarations. 391 */ 392 top_level_declaration: /* C99 6.9 calls this 'declaration' */ 393 T_SEMI { 394 if (sflag) { 395 /* empty declaration */ 396 error(0); 397 } else if (!tflag) { 398 /* empty declaration */ 399 warning(0); 400 } 401 } 402 | begin_type end_type notype_init_decls T_SEMI { 403 if (sflag) { 404 /* old style declaration; add 'int' */ 405 error(1); 406 } else if (!tflag) { 407 /* old style declaration; add 'int' */ 408 warning(1); 409 } 410 } 411 | begin_type_declmods end_type T_SEMI { 412 if (dcs->d_scl == TYPEDEF) { 413 /* typedef declares no type name */ 414 warning(72); 415 } else { 416 /* empty declaration */ 417 warning(2); 418 } 419 } 420 | begin_type_declmods end_type notype_init_decls T_SEMI 421 | begin_type_declaration_specifiers end_type T_SEMI { 422 if (dcs->d_scl == TYPEDEF) { 423 /* typedef declares no type name */ 424 warning(72); 425 } else if (!dcs->d_nonempty_decl) { 426 /* empty declaration */ 427 warning(2); 428 } 429 } 430 | begin_type_declaration_specifiers end_type type_init_decls T_SEMI 431 | error T_SEMI { 432 global_clean_up(); 433 } 434 | error T_RBRACE { 435 global_clean_up(); 436 } 437 ; 438 439 function_definition: /* C99 6.9.1 */ 440 func_decl { 441 if ($1->s_type->t_tspec != FUNC) { 442 /* syntax error '%s' */ 443 error(249, yytext); 444 YYERROR; 445 } 446 if ($1->s_type->t_typedef) { 447 /* ()-less function definition */ 448 error(64); 449 YYERROR; 450 } 451 funcdef($1); 452 block_level++; 453 begin_declaration_level(ARG); 454 if (lwarn == LWARN_NONE) 455 $1->s_used = true; 456 } arg_declaration_list_opt { 457 end_declaration_level(); 458 block_level--; 459 check_func_lint_directives(); 460 check_func_old_style_arguments(); 461 begin_control_statement(CS_FUNCTION_BODY); 462 } compound_statement { 463 funcend(); 464 end_control_statement(CS_FUNCTION_BODY); 465 } 466 ; 467 468 func_decl: 469 begin_type end_type notype_decl { 470 $$ = $3; 471 } 472 | begin_type_declmods end_type notype_decl { 473 $$ = $3; 474 } 475 | begin_type_declaration_specifiers end_type type_decl { 476 $$ = $3; 477 } 478 ; 479 480 arg_declaration_list_opt: /* C99 6.9.1p13 example 1 */ 481 /* empty */ 482 | arg_declaration_list 483 ; 484 485 arg_declaration_list: /* C99 6.9.1p13 example 1 */ 486 arg_declaration 487 | arg_declaration_list arg_declaration 488 /* XXX or better "arg_declaration error" ? */ 489 | error 490 ; 491 492 /* 493 * "arg_declaration" is separated from "declaration" because it 494 * needs other error handling. 495 */ 496 arg_declaration: 497 begin_type_declmods end_type T_SEMI { 498 /* empty declaration */ 499 warning(2); 500 } 501 | begin_type_declmods end_type notype_init_decls T_SEMI 502 | begin_type_declaration_specifiers end_type T_SEMI { 503 if (!dcs->d_nonempty_decl) { 504 /* empty declaration */ 505 warning(2); 506 } else { 507 /* '%s' declared in argument declaration list */ 508 warning(3, type_name(dcs->d_type)); 509 } 510 } 511 | begin_type_declaration_specifiers end_type type_init_decls T_SEMI { 512 if (dcs->d_nonempty_decl) { 513 /* '%s' declared in argument declaration list */ 514 warning(3, type_name(dcs->d_type)); 515 } 516 } 517 | begin_type_declmods error 518 | begin_type_declaration_specifiers error 519 ; 520 521 declaration: /* C99 6.7 */ 522 begin_type_declmods end_type T_SEMI { 523 if (dcs->d_scl == TYPEDEF) { 524 /* typedef declares no type name */ 525 warning(72); 526 } else { 527 /* empty declaration */ 528 warning(2); 529 } 530 } 531 | begin_type_declmods end_type notype_init_decls T_SEMI 532 | begin_type_declaration_specifiers end_type T_SEMI { 533 if (dcs->d_scl == TYPEDEF) { 534 /* typedef declares no type name */ 535 warning(72); 536 } else if (!dcs->d_nonempty_decl) { 537 /* empty declaration */ 538 warning(2); 539 } 540 } 541 | begin_type_declaration_specifiers end_type type_init_decls T_SEMI 542 | error T_SEMI 543 ; 544 545 begin_type: 546 /* empty */ { 547 begin_type(); 548 } 549 ; 550 551 end_type: 552 /* empty */ { 553 end_type(); 554 } 555 ; 556 557 begin_type_declaration_specifiers: /* see C99 6.7 */ 558 begin_type_typespec { 559 add_type($1); 560 } 561 | begin_type_declmods type_specifier { 562 add_type($2); 563 } 564 | type_attribute begin_type_declaration_specifiers 565 | begin_type_declaration_specifiers declmod 566 | begin_type_declaration_specifiers notype_type_specifier { 567 add_type($2); 568 } 569 ; 570 571 begin_type_declmods: 572 begin_type T_QUAL { 573 add_qualifier($2); 574 } 575 | begin_type T_SCLASS { 576 add_storage_class($2); 577 } 578 | begin_type_declmods declmod 579 ; 580 581 declmod: 582 T_QUAL { 583 add_qualifier($1); 584 } 585 | T_SCLASS { 586 add_storage_class($1); 587 } 588 | type_attribute_list 589 ; 590 591 begin_type_typespec: 592 begin_type notype_type_specifier { 593 $$ = $2; 594 } 595 | T_TYPENAME begin_type { 596 $$ = getsym($1)->s_type; 597 } 598 ; 599 600 type_attribute_list: 601 type_attribute 602 | type_attribute_list type_attribute 603 ; 604 605 type_attribute_opt: 606 /* empty */ 607 | type_attribute 608 ; 609 610 type_attribute: /* See C11 6.7 declaration-specifiers */ 611 T_ATTRIBUTE T_LPAREN T_LPAREN { 612 attron = true; 613 } gcc_attribute_spec_list { 614 attron = false; 615 } T_RPAREN T_RPAREN 616 | T_ALIGNAS T_LPAREN align_as T_RPAREN 617 | T_PACKED { 618 addpacked(); 619 } 620 | T_NORETURN 621 ; 622 623 type_specifier: /* C99 6.7.2 */ 624 notype_type_specifier 625 | T_TYPENAME { 626 $$ = getsym($1)->s_type; 627 } 628 ; 629 630 notype_type_specifier: 631 T_TYPE { 632 $$ = gettyp($1); 633 } 634 | T_TYPEOF cast_expression { /* GCC extension */ 635 $$ = $2->tn_type; 636 } 637 | struct_or_union_specifier { 638 end_declaration_level(); 639 $$ = $1; 640 } 641 | enum_specifier { 642 end_declaration_level(); 643 $$ = $1; 644 } 645 ; 646 647 struct_or_union_specifier: /* C99 6.7.2.1 */ 648 struct_or_union identifier_sym { 649 /* 650 * STDC requires that "struct a;" always introduces 651 * a new tag if "a" is not declared at current level 652 * 653 * yychar is valid because otherwise the parser would not 654 * have been able to decide if it must shift or reduce 655 */ 656 $$ = mktag($2, $1, false, yychar == T_SEMI); 657 } 658 | struct_or_union identifier_sym { 659 dcs->d_tagtyp = mktag($2, $1, true, false); 660 } braced_struct_declaration_list { 661 $$ = complete_tag_struct_or_union(dcs->d_tagtyp, $4); 662 } 663 | struct_or_union { 664 dcs->d_tagtyp = mktag(NULL, $1, true, false); 665 } braced_struct_declaration_list { 666 $$ = complete_tag_struct_or_union(dcs->d_tagtyp, $3); 667 } 668 | struct_or_union error { 669 symtyp = FVFT; 670 $$ = gettyp(INT); 671 } 672 ; 673 674 struct_or_union: /* C99 6.7.2.1 */ 675 struct_or_union type_attribute 676 | T_STRUCT_OR_UNION { 677 symtyp = FTAG; 678 begin_declaration_level($1 == STRUCT ? MOS : MOU); 679 dcs->d_offset = 0; 680 dcs->d_sou_align_in_bits = CHAR_SIZE; 681 $$ = $1; 682 } 683 ; 684 685 braced_struct_declaration_list: 686 struct_declaration_lbrace struct_declaration_list_with_rbrace { 687 $$ = $2; 688 } 689 ; 690 691 struct_declaration_lbrace: 692 T_LBRACE { 693 symtyp = FVFT; 694 } 695 ; 696 697 struct_declaration_list_with_rbrace: 698 struct_declaration_list T_SEMI T_RBRACE 699 | struct_declaration_list T_RBRACE { 700 if (sflag) { 701 /* syntax req. ';' after last struct/union member */ 702 error(66); 703 } else { 704 /* syntax req. ';' after last struct/union member */ 705 warning(66); 706 } 707 $$ = $1; 708 } 709 | T_RBRACE { 710 $$ = NULL; 711 } 712 ; 713 714 struct_declaration_list: 715 struct_declaration 716 | struct_declaration_list T_SEMI struct_declaration { 717 $$ = lnklst($1, $3); 718 } 719 ; 720 721 struct_declaration: 722 begin_type_noclass_declmods end_type { 723 /* too late, i know, but getsym() compensates it */ 724 symtyp = FMEMBER; 725 } notype_member_decls type_attribute_opt { 726 symtyp = FVFT; 727 $$ = $4; 728 } 729 | begin_type_noclass_declspecs end_type { 730 symtyp = FMEMBER; 731 } type_member_decls type_attribute_opt { 732 symtyp = FVFT; 733 $$ = $4; 734 } 735 | begin_type_noclass_declmods end_type type_attribute_opt { 736 /* syntax error '%s' */ 737 error(249, "member without type"); 738 $$ = NULL; 739 } 740 | begin_type_noclass_declspecs end_type type_attribute_opt { 741 symtyp = FVFT; 742 if (!Sflag) 743 /* anonymous struct/union members is a C9X feature */ 744 warning(49); 745 if (is_struct_or_union(dcs->d_type->t_tspec)) { 746 $$ = dcs->d_type->t_str->sou_first_member; 747 /* add all the members of the anonymous struct/union */ 748 anonymize($$); 749 } else { 750 /* syntax error '%s' */ 751 error(249, "unnamed member"); 752 $$ = NULL; 753 } 754 } 755 | error { 756 symtyp = FVFT; 757 $$ = NULL; 758 } 759 ; 760 761 begin_type_noclass_declspecs: 762 begin_type_typespec { 763 add_type($1); 764 } 765 | type_attribute begin_type_noclass_declspecs 766 | begin_type_noclass_declmods type_specifier { 767 add_type($2); 768 } 769 | begin_type_noclass_declspecs T_QUAL { 770 add_qualifier($2); 771 } 772 | begin_type_noclass_declspecs notype_type_specifier { 773 add_type($2); 774 } 775 | begin_type_noclass_declspecs type_attribute 776 ; 777 778 begin_type_noclass_declmods: 779 begin_type T_QUAL { 780 add_qualifier($2); 781 } 782 | begin_type_noclass_declmods T_QUAL { 783 add_qualifier($2); 784 } 785 ; 786 787 notype_member_decls: 788 notype_member_decl { 789 $$ = declarator_1_struct_union($1); 790 } 791 | notype_member_decls { 792 symtyp = FMEMBER; 793 } T_COMMA type_member_decl { 794 $$ = lnklst($1, declarator_1_struct_union($4)); 795 } 796 ; 797 798 type_member_decls: 799 type_member_decl { 800 $$ = declarator_1_struct_union($1); 801 } 802 | type_member_decls { 803 symtyp = FMEMBER; 804 } T_COMMA type_member_decl { 805 $$ = lnklst($1, declarator_1_struct_union($4)); 806 } 807 ; 808 809 notype_member_decl: 810 notype_decl 811 | notype_decl T_COLON constant_expr { /* C99 6.7.2.1 */ 812 $$ = bitfield($1, to_int_constant($3, true)); 813 } 814 | { 815 symtyp = FVFT; 816 } T_COLON constant_expr { /* C99 6.7.2.1 */ 817 $$ = bitfield(NULL, to_int_constant($3, true)); 818 } 819 ; 820 821 type_member_decl: 822 type_decl 823 | type_decl T_COLON constant_expr { 824 $$ = bitfield($1, to_int_constant($3, true)); 825 } 826 | { 827 symtyp = FVFT; 828 } T_COLON constant_expr { 829 $$ = bitfield(NULL, to_int_constant($3, true)); 830 } 831 ; 832 833 enum_specifier: /* C99 6.7.2.2 */ 834 enum identifier_sym { 835 $$ = mktag($2, ENUM, false, false); 836 } 837 | enum identifier_sym { 838 dcs->d_tagtyp = mktag($2, ENUM, true, false); 839 } enum_declaration { 840 $$ = complete_tag_enum(dcs->d_tagtyp, $4); 841 } 842 | enum { 843 dcs->d_tagtyp = mktag(NULL, ENUM, true, false); 844 } enum_declaration { 845 $$ = complete_tag_enum(dcs->d_tagtyp, $3); 846 } 847 | enum error { 848 symtyp = FVFT; 849 $$ = gettyp(INT); 850 } 851 ; 852 853 enum: 854 T_ENUM { 855 symtyp = FTAG; 856 begin_declaration_level(CTCONST); 857 } 858 ; 859 860 enum_declaration: 861 enum_decl_lbrace enums_with_opt_comma T_RBRACE { 862 $$ = $2; 863 } 864 ; 865 866 enum_decl_lbrace: 867 T_LBRACE { 868 symtyp = FVFT; 869 enumval = 0; 870 } 871 ; 872 873 enums_with_opt_comma: 874 enumerator_list 875 | enumerator_list T_COMMA { 876 if (sflag) { 877 /* trailing ',' prohibited in enum declaration */ 878 error(54); 879 } else { 880 /* trailing ',' prohibited in enum declaration */ 881 c99ism(54); 882 } 883 $$ = $1; 884 } 885 ; 886 887 enumerator_list: 888 enumerator 889 | enumerator_list T_COMMA enumerator { 890 $$ = lnklst($1, $3); 891 } 892 | error { 893 $$ = NULL; 894 } 895 ; 896 897 enumerator: /* C99 6.7.2.2 */ 898 identifier_sym { 899 $$ = enumeration_constant($1, enumval, true); 900 } 901 | identifier_sym T_ASSIGN constant_expr { 902 $$ = enumeration_constant($1, to_int_constant($3, true), false); 903 } 904 ; 905 906 907 /* 908 * For an explanation of 'notype' in the following rules, see the Bison 909 * manual, section 7.1 "Semantic Info in Token Kinds". 910 */ 911 912 notype_init_decls: 913 notype_init_decl 914 | notype_init_decls T_COMMA type_init_decl 915 ; 916 917 type_init_decls: 918 type_init_decl 919 | type_init_decls T_COMMA type_init_decl 920 ; 921 922 notype_init_decl: 923 notype_decl asm_or_symbolrename_opt { 924 cgram_declare($1, false, $2); 925 check_size($1); 926 } 927 | notype_decl asm_or_symbolrename_opt { 928 begin_initialization($1); 929 cgram_declare($1, true, $2); 930 } T_ASSIGN initializer { 931 check_size($1); 932 end_initialization(); 933 } 934 ; 935 936 type_init_decl: 937 type_decl asm_or_symbolrename_opt { 938 cgram_declare($1, false, $2); 939 check_size($1); 940 } 941 | type_decl asm_or_symbolrename_opt { 942 begin_initialization($1); 943 cgram_declare($1, true, $2); 944 } T_ASSIGN initializer { 945 check_size($1); 946 end_initialization(); 947 } 948 ; 949 950 notype_decl: 951 notype_direct_decl 952 | pointer notype_direct_decl { 953 $$ = add_pointer($2, $1); 954 } 955 ; 956 957 type_decl: 958 type_direct_decl 959 | pointer type_direct_decl { 960 $$ = add_pointer($2, $1); 961 } 962 ; 963 964 notype_direct_decl: 965 T_NAME { 966 $$ = declarator_name(getsym($1)); 967 } 968 | T_LPAREN type_decl T_RPAREN { 969 $$ = $2; 970 } 971 | type_attribute notype_direct_decl { 972 $$ = $2; 973 } 974 | notype_direct_decl T_LBRACK T_RBRACK { 975 $$ = add_array($1, false, 0); 976 } 977 | notype_direct_decl T_LBRACK array_size T_RBRACK { 978 $$ = add_array($1, true, to_int_constant($3, false)); 979 } 980 | notype_direct_decl param_list asm_or_symbolrename_opt { 981 $$ = add_function(symbolrename($1, $3), $2); 982 end_declaration_level(); 983 block_level--; 984 } 985 | notype_direct_decl type_attribute 986 ; 987 988 type_direct_decl: 989 identifier { 990 $$ = declarator_name(getsym($1)); 991 } 992 | T_LPAREN type_decl T_RPAREN { 993 $$ = $2; 994 } 995 | type_attribute type_direct_decl { 996 $$ = $2; 997 } 998 | type_direct_decl T_LBRACK T_RBRACK { 999 $$ = add_array($1, false, 0); 1000 } 1001 | type_direct_decl T_LBRACK array_size T_RBRACK { 1002 $$ = add_array($1, true, to_int_constant($3, false)); 1003 } 1004 | type_direct_decl param_list asm_or_symbolrename_opt { 1005 $$ = add_function(symbolrename($1, $3), $2); 1006 end_declaration_level(); 1007 block_level--; 1008 } 1009 | type_direct_decl type_attribute 1010 ; 1011 1012 /* 1013 * The two distinct rules type_param_decl and notype_param_decl avoid a 1014 * conflict in argument lists. A typename enclosed in parentheses is always 1015 * treated as a typename, not an argument name. For example, after 1016 * "typedef double a;", the declaration "f(int (a));" is interpreted as 1017 * "f(int (double));", not "f(int a);". 1018 */ 1019 type_param_decl: 1020 direct_param_decl 1021 | pointer direct_param_decl { 1022 $$ = add_pointer($2, $1); 1023 } 1024 ; 1025 1026 array_size: 1027 type_qualifier_list_opt T_SCLASS constant_expr { 1028 /* C11 6.7.6.3p7 */ 1029 if ($2 != STATIC) 1030 yyerror("Bad attribute"); 1031 /* static array size is a C11 extension */ 1032 c11ism(343); 1033 $$ = $3; 1034 } 1035 | constant_expr 1036 ; 1037 1038 direct_param_decl: 1039 identifier type_attribute_list { 1040 $$ = declarator_name(getsym($1)); 1041 } 1042 | identifier { 1043 $$ = declarator_name(getsym($1)); 1044 } 1045 | T_LPAREN notype_param_decl T_RPAREN { 1046 $$ = $2; 1047 } 1048 | direct_param_decl T_LBRACK T_RBRACK { 1049 $$ = add_array($1, false, 0); 1050 } 1051 | direct_param_decl T_LBRACK array_size T_RBRACK { 1052 $$ = add_array($1, true, to_int_constant($3, false)); 1053 } 1054 | direct_param_decl param_list asm_or_symbolrename_opt { 1055 $$ = add_function(symbolrename($1, $3), $2); 1056 end_declaration_level(); 1057 block_level--; 1058 } 1059 ; 1060 1061 notype_param_decl: 1062 direct_notype_param_decl 1063 | pointer direct_notype_param_decl { 1064 $$ = add_pointer($2, $1); 1065 } 1066 ; 1067 1068 direct_notype_param_decl: 1069 identifier { 1070 $$ = declarator_name(getsym($1)); 1071 } 1072 | T_LPAREN notype_param_decl T_RPAREN { 1073 $$ = $2; 1074 } 1075 | direct_notype_param_decl T_LBRACK T_RBRACK { 1076 $$ = add_array($1, false, 0); 1077 } 1078 | direct_notype_param_decl T_LBRACK array_size T_RBRACK { 1079 $$ = add_array($1, true, to_int_constant($3, false)); 1080 } 1081 | direct_notype_param_decl param_list asm_or_symbolrename_opt { 1082 $$ = add_function(symbolrename($1, $3), $2); 1083 end_declaration_level(); 1084 block_level--; 1085 } 1086 ; 1087 1088 pointer: /* C99 6.7.5 */ 1089 asterisk type_qualifier_list_opt { 1090 $$ = merge_qualified_pointer($1, $2); 1091 } 1092 | asterisk type_qualifier_list_opt pointer { 1093 $$ = merge_qualified_pointer($1, $2); 1094 $$ = merge_qualified_pointer($$, $3); 1095 } 1096 ; 1097 1098 asterisk: 1099 T_ASTERISK { 1100 $$ = xcalloc(1, sizeof(*$$)); 1101 $$->p_pointer = true; 1102 } 1103 ; 1104 1105 type_qualifier_list_opt: 1106 /* empty */ { 1107 $$ = NULL; 1108 } 1109 | type_qualifier_list 1110 ; 1111 1112 type_qualifier_list: /* C99 6.7.5 */ 1113 type_qualifier 1114 | type_qualifier_list type_qualifier { 1115 $$ = merge_qualified_pointer($1, $2); 1116 } 1117 ; 1118 1119 type_qualifier: 1120 T_QUAL { 1121 $$ = xcalloc(1, sizeof(*$$)); 1122 if ($1 == CONST) { 1123 $$->p_const = true; 1124 } else if ($1 == VOLATILE) { 1125 $$->p_volatile = true; 1126 } else { 1127 lint_assert($1 == RESTRICT || $1 == THREAD); 1128 } 1129 } 1130 ; 1131 1132 align_as: /* See alignment-specifier in C11 6.7.5 */ 1133 type_specifier 1134 | constant_expr 1135 ; 1136 1137 param_list: 1138 id_list_lparen identifier_list T_RPAREN { 1139 $$ = $2; 1140 } 1141 | abstract_decl_param_list 1142 ; 1143 1144 id_list_lparen: 1145 T_LPAREN { 1146 block_level++; 1147 begin_declaration_level(PROTO_ARG); 1148 } 1149 ; 1150 1151 identifier_list: 1152 T_NAME { 1153 $$ = old_style_function_name(getsym($1)); 1154 } 1155 | identifier_list T_COMMA T_NAME { 1156 $$ = lnklst($1, old_style_function_name(getsym($3))); 1157 } 1158 | identifier_list error 1159 ; 1160 1161 abstract_decl_param_list: 1162 abstract_decl_lparen T_RPAREN type_attribute_opt { 1163 $$ = NULL; 1164 } 1165 | abstract_decl_lparen vararg_parameter_type_list T_RPAREN type_attribute_opt { 1166 dcs->d_proto = true; 1167 $$ = $2; 1168 } 1169 | abstract_decl_lparen error T_RPAREN type_attribute_opt { 1170 $$ = NULL; 1171 } 1172 ; 1173 1174 abstract_decl_lparen: 1175 T_LPAREN { 1176 block_level++; 1177 begin_declaration_level(PROTO_ARG); 1178 } 1179 ; 1180 1181 vararg_parameter_type_list: 1182 parameter_type_list 1183 | parameter_type_list T_COMMA T_ELLIPSIS { 1184 dcs->d_vararg = true; 1185 $$ = $1; 1186 } 1187 | T_ELLIPSIS { 1188 if (sflag) { 1189 /* ANSI C requires formal parameter before '...' */ 1190 error(84); 1191 } else if (!tflag) { 1192 /* ANSI C requires formal parameter before '...' */ 1193 warning(84); 1194 } 1195 dcs->d_vararg = true; 1196 $$ = NULL; 1197 } 1198 ; 1199 1200 parameter_type_list: 1201 parameter_declaration 1202 | parameter_type_list T_COMMA parameter_declaration { 1203 $$ = lnklst($1, $3); 1204 } 1205 ; 1206 1207 /* XXX: C99 6.7.5 defines the same name, but it looks completely different. */ 1208 parameter_declaration: 1209 begin_type_declmods end_type { 1210 $$ = declare_argument(abstract_name(), false); 1211 } 1212 | begin_type_declaration_specifiers end_type { 1213 $$ = declare_argument(abstract_name(), false); 1214 } 1215 | begin_type_declmods end_type notype_param_decl { 1216 $$ = declare_argument($3, false); 1217 } 1218 /* 1219 * type_param_decl is needed because of following conflict: 1220 * "typedef int a; f(int (a));" could be parsed as 1221 * "function with argument a of type int", or 1222 * "function with an abstract argument of type function". 1223 * This grammar realizes the second case. 1224 */ 1225 | begin_type_declaration_specifiers end_type type_param_decl { 1226 $$ = declare_argument($3, false); 1227 } 1228 | begin_type_declmods end_type abstract_declarator { 1229 $$ = declare_argument($3, false); 1230 } 1231 | begin_type_declaration_specifiers end_type abstract_declarator { 1232 $$ = declare_argument($3, false); 1233 } 1234 ; 1235 1236 asm_or_symbolrename_opt: /* expect only one */ 1237 /* empty */ { 1238 $$ = NULL; 1239 } 1240 | T_ASM T_LPAREN T_STRING T_RPAREN { 1241 freeyyv(&$3, T_STRING); 1242 $$ = NULL; 1243 } 1244 | T_SYMBOLRENAME T_LPAREN T_NAME T_RPAREN { 1245 $$ = $3; 1246 } 1247 ; 1248 1249 initializer: /* C99 6.7.8 "Initialization" */ 1250 expr %prec T_COMMA { 1251 init_expr($1); 1252 } 1253 | init_lbrace init_rbrace { 1254 /* XXX: Empty braces are not covered by C99 6.7.8. */ 1255 } 1256 | init_lbrace initializer_list comma_opt init_rbrace 1257 | error 1258 ; 1259 1260 initializer_list: /* C99 6.7.8 "Initialization" */ 1261 initializer_list_item 1262 | initializer_list T_COMMA initializer_list_item 1263 ; 1264 1265 initializer_list_item: 1266 designation initializer 1267 | initializer 1268 ; 1269 1270 designation: /* C99 6.7.8 "Initialization" */ 1271 designator_list T_ASSIGN 1272 | identifier T_COLON { 1273 /* GCC style struct or union member name in initializer */ 1274 gnuism(315); 1275 add_designator_member($1); 1276 } 1277 ; 1278 1279 designator_list: /* C99 6.7.8 "Initialization" */ 1280 designator 1281 | designator_list designator 1282 ; 1283 1284 designator: /* C99 6.7.8 "Initialization" */ 1285 T_LBRACK range T_RBRACK { 1286 add_designator_subscript($2); 1287 if (!Sflag) 1288 /* array initializer with des.s is a C9X feature */ 1289 warning(321); 1290 } 1291 | T_POINT identifier { 1292 if (!Sflag) 1293 /* struct or union member name in initializer is ... */ 1294 warning(313); 1295 add_designator_member($2); 1296 } 1297 ; 1298 1299 range: 1300 constant_expr { 1301 $$.lo = to_int_constant($1, true); 1302 $$.hi = $$.lo; 1303 } 1304 | constant_expr T_ELLIPSIS constant_expr { 1305 $$.lo = to_int_constant($1, true); 1306 $$.hi = to_int_constant($3, true); 1307 /* initialization with '[a...b]' is a GCC extension */ 1308 gnuism(340); 1309 } 1310 ; 1311 1312 init_lbrace: 1313 T_LBRACE { 1314 init_lbrace(); 1315 } 1316 ; 1317 1318 init_rbrace: 1319 T_RBRACE { 1320 init_rbrace(); 1321 } 1322 ; 1323 1324 type_name: /* C99 6.7.6 */ 1325 { 1326 begin_declaration_level(ABSTRACT); 1327 } abstract_declaration { 1328 end_declaration_level(); 1329 $$ = $2->s_type; 1330 } 1331 ; 1332 1333 abstract_declaration: 1334 begin_type_noclass_declmods end_type { 1335 $$ = declare_1_abstract(abstract_name()); 1336 } 1337 | begin_type_noclass_declspecs end_type { 1338 $$ = declare_1_abstract(abstract_name()); 1339 } 1340 | begin_type_noclass_declmods end_type abstract_declarator { 1341 $$ = declare_1_abstract($3); 1342 } 1343 | begin_type_noclass_declspecs end_type abstract_declarator { 1344 $$ = declare_1_abstract($3); 1345 } 1346 ; 1347 1348 abstract_declarator: /* C99 6.7.6 */ 1349 pointer { 1350 $$ = add_pointer(abstract_name(), $1); 1351 } 1352 | direct_abstract_declarator 1353 | pointer direct_abstract_declarator { 1354 $$ = add_pointer($2, $1); 1355 } 1356 | T_TYPEOF cast_expression { /* GCC extension */ 1357 $$ = mktempsym($2->tn_type); 1358 } 1359 ; 1360 1361 direct_abstract_declarator: /* C99 6.7.6 */ 1362 T_LPAREN abstract_declarator T_RPAREN { 1363 $$ = $2; 1364 } 1365 | T_LBRACK T_RBRACK { 1366 $$ = add_array(abstract_name(), false, 0); 1367 } 1368 | T_LBRACK array_size T_RBRACK { 1369 $$ = add_array(abstract_name(), true, to_int_constant($2, false)); 1370 } 1371 | type_attribute direct_abstract_declarator { 1372 $$ = $2; 1373 } 1374 | direct_abstract_declarator T_LBRACK T_RBRACK { 1375 $$ = add_array($1, false, 0); 1376 } 1377 | direct_abstract_declarator T_LBRACK T_ASTERISK T_RBRACK { /* C99 */ 1378 $$ = add_array($1, false, 0); 1379 } 1380 | direct_abstract_declarator T_LBRACK array_size T_RBRACK { 1381 $$ = add_array($1, true, to_int_constant($3, false)); 1382 } 1383 | abstract_decl_param_list asm_or_symbolrename_opt { 1384 $$ = add_function(symbolrename(abstract_name(), $2), $1); 1385 end_declaration_level(); 1386 block_level--; 1387 } 1388 | direct_abstract_declarator abstract_decl_param_list asm_or_symbolrename_opt { 1389 $$ = add_function(symbolrename($1, $3), $2); 1390 end_declaration_level(); 1391 block_level--; 1392 } 1393 | direct_abstract_declarator type_attribute_list 1394 ; 1395 1396 non_expr_statement: 1397 type_attribute T_SEMI 1398 | labeled_statement 1399 | compound_statement 1400 | selection_statement 1401 | iteration_statement 1402 | jump_statement { 1403 seen_fallthrough = false; 1404 } 1405 | asm_statement 1406 ; 1407 1408 statement: /* C99 6.8 */ 1409 expression_statement 1410 | non_expr_statement 1411 ; 1412 1413 labeled_statement: /* C99 6.8.1 */ 1414 label type_attribute_opt statement 1415 ; 1416 1417 label: 1418 T_NAME T_COLON { 1419 symtyp = FLABEL; 1420 named_label(getsym($1)); 1421 } 1422 | T_CASE constant_expr T_COLON { 1423 case_label($2); 1424 seen_fallthrough = true; 1425 } 1426 | T_CASE constant_expr T_ELLIPSIS constant_expr T_COLON { 1427 /* XXX: We don't fill all cases */ 1428 case_label($2); 1429 seen_fallthrough = true; 1430 } 1431 | T_DEFAULT T_COLON { 1432 default_label(); 1433 seen_fallthrough = true; 1434 } 1435 ; 1436 1437 compound_statement: /* C99 6.8.2 */ 1438 compound_statement_lbrace compound_statement_rbrace 1439 | compound_statement_lbrace block_item_list compound_statement_rbrace 1440 ; 1441 1442 compound_statement_lbrace: 1443 T_LBRACE { 1444 block_level++; 1445 mem_block_level++; 1446 begin_declaration_level(AUTO); 1447 } 1448 ; 1449 1450 compound_statement_rbrace: 1451 T_RBRACE { 1452 end_declaration_level(); 1453 freeblk(); 1454 mem_block_level--; 1455 block_level--; 1456 seen_fallthrough = false; 1457 } 1458 ; 1459 1460 block_item_list: /* C99 6.8.2 */ 1461 block_item 1462 | block_item_list block_item { 1463 if (!Sflag && $1 && !$2) 1464 /* declarations after statements is a C99 feature */ 1465 c99ism(327); 1466 $$ = $1 || $2; 1467 } 1468 ; 1469 1470 block_item: /* C99 6.8.2 */ 1471 declaration { 1472 $$ = false; 1473 restore_warning_flags(); 1474 } 1475 | statement { 1476 $$ = true; 1477 restore_warning_flags(); 1478 } 1479 ; 1480 1481 expression_statement: /* C99 6.8.3 */ 1482 expr T_SEMI { 1483 expr($1, false, false, false, false); 1484 seen_fallthrough = false; 1485 } 1486 | T_SEMI { 1487 seen_fallthrough = false; 1488 } 1489 ; 1490 1491 selection_statement: /* C99 6.8.4 */ 1492 if_without_else %prec T_THEN { 1493 save_warning_flags(); 1494 if2(); 1495 if3(false); 1496 } 1497 | if_without_else T_ELSE { 1498 save_warning_flags(); 1499 if2(); 1500 } statement { 1501 clear_warning_flags(); 1502 if3(true); 1503 } 1504 | if_without_else T_ELSE error { 1505 clear_warning_flags(); 1506 if3(false); 1507 } 1508 | switch_expr statement { 1509 clear_warning_flags(); 1510 switch2(); 1511 } 1512 | switch_expr error { 1513 clear_warning_flags(); 1514 switch2(); 1515 } 1516 ; 1517 1518 if_without_else: /* see C99 6.8.4 */ 1519 if_expr statement 1520 | if_expr error 1521 ; 1522 1523 if_expr: /* see C99 6.8.4 */ 1524 T_IF T_LPAREN expr T_RPAREN { 1525 if1($3); 1526 clear_warning_flags(); 1527 } 1528 ; 1529 1530 switch_expr: /* see C99 6.8.4 */ 1531 T_SWITCH T_LPAREN expr T_RPAREN { 1532 switch1($3); 1533 clear_warning_flags(); 1534 } 1535 ; 1536 1537 do_statement: /* C99 6.8.5 */ 1538 do statement { 1539 clear_warning_flags(); 1540 } 1541 ; 1542 1543 iteration_statement: /* C99 6.8.5 */ 1544 while_expr statement { 1545 clear_warning_flags(); 1546 while2(); 1547 } 1548 | while_expr error { 1549 clear_warning_flags(); 1550 while2(); 1551 } 1552 | do_statement do_while_expr { 1553 do2($2); 1554 seen_fallthrough = false; 1555 } 1556 | do error { 1557 clear_warning_flags(); 1558 do2(NULL); 1559 } 1560 | for_exprs statement { 1561 clear_warning_flags(); 1562 for2(); 1563 end_declaration_level(); 1564 block_level--; 1565 } 1566 | for_exprs error { 1567 clear_warning_flags(); 1568 for2(); 1569 end_declaration_level(); 1570 block_level--; 1571 } 1572 ; 1573 1574 while_expr: 1575 T_WHILE T_LPAREN expr T_RPAREN { 1576 while1($3); 1577 clear_warning_flags(); 1578 } 1579 ; 1580 1581 do: /* see C99 6.8.5 */ 1582 T_DO { 1583 do1(); 1584 } 1585 ; 1586 1587 do_while_expr: 1588 T_WHILE T_LPAREN expr T_RPAREN T_SEMI { 1589 $$ = $3; 1590 } 1591 ; 1592 1593 for_start: /* see C99 6.8.5 */ 1594 T_FOR T_LPAREN { 1595 begin_declaration_level(AUTO); 1596 block_level++; 1597 } 1598 ; 1599 1600 for_exprs: /* see C99 6.8.5 */ 1601 for_start begin_type_declaration_specifiers end_type notype_init_decls T_SEMI 1602 expr_opt T_SEMI expr_opt T_RPAREN { 1603 /* variable declaration in for loop */ 1604 c99ism(325); 1605 for1(NULL, $6, $8); 1606 clear_warning_flags(); 1607 } 1608 | for_start expr_opt T_SEMI expr_opt T_SEMI expr_opt T_RPAREN { 1609 for1($2, $4, $6); 1610 clear_warning_flags(); 1611 } 1612 ; 1613 1614 jump_statement: /* C99 6.8.6 */ 1615 goto identifier T_SEMI { 1616 do_goto(getsym($2)); 1617 } 1618 | goto error T_SEMI { 1619 symtyp = FVFT; 1620 } 1621 | T_CONTINUE T_SEMI { 1622 do_continue(); 1623 } 1624 | T_BREAK T_SEMI { 1625 do_break(); 1626 } 1627 | T_RETURN T_SEMI { 1628 do_return(NULL); 1629 } 1630 | T_RETURN expr T_SEMI { 1631 do_return($2); 1632 } 1633 ; 1634 1635 goto: 1636 T_GOTO { 1637 symtyp = FLABEL; 1638 } 1639 ; 1640 1641 asm_statement: 1642 T_ASM T_LPAREN read_until_rparen T_SEMI { 1643 setasm(); 1644 } 1645 | T_ASM T_QUAL T_LPAREN read_until_rparen T_SEMI { 1646 setasm(); 1647 } 1648 | T_ASM error 1649 ; 1650 1651 read_until_rparen: 1652 /* empty */ { 1653 ignore_up_to_rparen(); 1654 } 1655 ; 1656 1657 constant_expr_list_opt: 1658 /* empty */ 1659 | constant_expr_list 1660 ; 1661 1662 constant_expr_list: 1663 constant_expr 1664 | constant_expr_list T_COMMA constant_expr 1665 ; 1666 1667 constant_expr: /* C99 6.6 */ 1668 expr %prec T_ASSIGN 1669 ; 1670 1671 expr_opt: 1672 /* empty */ { 1673 $$ = NULL; 1674 } 1675 | expr 1676 ; 1677 1678 expr: /* C99 6.5 */ 1679 expr T_ASTERISK expr { 1680 $$ = build(MULT, $1, $3); 1681 } 1682 | expr T_MULTIPLICATIVE expr { 1683 $$ = build($2, $1, $3); 1684 } 1685 | expr T_ADDITIVE expr { 1686 $$ = build($2, $1, $3); 1687 } 1688 | expr T_SHIFT expr { 1689 $$ = build($2, $1, $3); 1690 } 1691 | expr T_RELATIONAL expr { 1692 $$ = build($2, $1, $3); 1693 } 1694 | expr T_EQUALITY expr { 1695 $$ = build($2, $1, $3); 1696 } 1697 | expr T_AMPER expr { 1698 $$ = build(BITAND, $1, $3); 1699 } 1700 | expr T_BITXOR expr { 1701 $$ = build(BITXOR, $1, $3); 1702 } 1703 | expr T_BITOR expr { 1704 $$ = build(BITOR, $1, $3); 1705 } 1706 | expr T_LOGAND expr { 1707 $$ = build(LOGAND, $1, $3); 1708 } 1709 | expr T_LOGOR expr { 1710 $$ = build(LOGOR, $1, $3); 1711 } 1712 | expr T_QUEST expr T_COLON expr { 1713 $$ = build(QUEST, $1, build(COLON, $3, $5)); 1714 } 1715 | expr T_ASSIGN expr { 1716 $$ = build(ASSIGN, $1, $3); 1717 } 1718 | expr T_OPASSIGN expr { 1719 $$ = build($2, $1, $3); 1720 } 1721 | expr T_COMMA expr { 1722 $$ = build(COMMA, $1, $3); 1723 } 1724 | cast_expression 1725 | generic_selection /* TODO: move to primary_expression */ 1726 ; 1727 1728 assignment_expression: /* C99 6.5.16 */ 1729 expr %prec T_ASSIGN 1730 ; 1731 1732 primary_expression: /* C99 6.5.1 */ 1733 T_NAME { 1734 /* XXX really necessary? */ 1735 if (yychar < 0) 1736 yychar = yylex(); 1737 $$ = new_name_node(getsym($1), yychar); 1738 } 1739 | T_CON { 1740 $$ = expr_new_constant(gettyp($1->v_tspec), $1); 1741 } 1742 | string { 1743 $$ = new_string_node($1); 1744 } 1745 | T_LPAREN expr T_RPAREN { 1746 if ($2 != NULL) 1747 $2->tn_parenthesized = true; 1748 $$ = $2; 1749 } 1750 /* GCC primary-expression, see c_parser_postfix_expression */ 1751 | T_BUILTIN_OFFSETOF T_LPAREN type_name T_COMMA identifier T_RPAREN { 1752 symtyp = FMEMBER; 1753 $$ = build_offsetof($3, getsym($5)); 1754 } 1755 ; 1756 1757 postfix_expression: /* C99 6.5.2 */ 1758 primary_expression 1759 | postfix_expression T_LBRACK expr T_RBRACK { 1760 $$ = build(INDIR, build(PLUS, $1, $3), NULL); 1761 } 1762 | postfix_expression T_LPAREN T_RPAREN { 1763 $$ = new_function_call_node($1, NULL); 1764 } 1765 | postfix_expression T_LPAREN argument_expression_list T_RPAREN { 1766 $$ = new_function_call_node($1, $3); 1767 } 1768 | postfix_expression point_or_arrow T_NAME { 1769 if ($1 != NULL) { 1770 sym_t *msym; 1771 /* 1772 * XXX struct_or_union_member should be integrated 1773 * in build() 1774 */ 1775 if ($2 == ARROW) { 1776 /* 1777 * must do this before struct_or_union_member 1778 * is called 1779 */ 1780 $1 = cconv($1); 1781 } 1782 msym = struct_or_union_member($1, $2, getsym($3)); 1783 $$ = build($2, $1, new_name_node(msym, 0)); 1784 } else { 1785 $$ = NULL; 1786 } 1787 } 1788 | postfix_expression T_INCDEC { 1789 $$ = build($2 == INC ? INCAFT : DECAFT, $1, NULL); 1790 } 1791 | T_LPAREN type_name T_RPAREN { /* C99 6.5.2.5 "Compound literals" */ 1792 sym_t *tmp = mktempsym($2); 1793 begin_initialization(tmp); 1794 cgram_declare(tmp, true, NULL); 1795 } init_lbrace initializer_list comma_opt init_rbrace { 1796 if (!Sflag) 1797 /* compound literals are a C9X/GCC extension */ 1798 gnuism(319); 1799 $$ = new_name_node(*current_initsym(), 0); 1800 end_initialization(); 1801 } 1802 | T_LPAREN compound_statement_lbrace gcc_statement_expr_list { 1803 block_level--; 1804 mem_block_level--; 1805 begin_initialization(mktempsym(dup_type($3->tn_type))); 1806 mem_block_level++; 1807 block_level++; 1808 /* ({ }) is a GCC extension */ 1809 gnuism(320); 1810 } compound_statement_rbrace T_RPAREN { 1811 $$ = new_name_node(*current_initsym(), 0); 1812 end_initialization(); 1813 } 1814 ; 1815 1816 unary_expression: /* C99 6.5.3 */ 1817 postfix_expression 1818 | T_INCDEC unary_expression { 1819 $$ = build($1 == INC ? INCBEF : DECBEF, $2, NULL); 1820 } 1821 | T_AMPER cast_expression { 1822 $$ = build(ADDR, $2, NULL); 1823 } 1824 | T_ASTERISK cast_expression { 1825 $$ = build(INDIR, $2, NULL); 1826 } 1827 | T_ADDITIVE cast_expression { 1828 if (tflag && $1 == PLUS) { 1829 /* unary + is illegal in traditional C */ 1830 warning(100); 1831 } 1832 $$ = build($1 == PLUS ? UPLUS : UMINUS, $2, NULL); 1833 } 1834 | T_COMPLEMENT cast_expression { 1835 $$ = build(COMPL, $2, NULL); 1836 } 1837 | T_LOGNOT cast_expression { 1838 $$ = build(NOT, $2, NULL); 1839 } 1840 | T_REAL cast_expression { /* GCC c_parser_unary_expression */ 1841 $$ = build(REAL, $2, NULL); 1842 } 1843 | T_IMAG cast_expression { /* GCC c_parser_unary_expression */ 1844 $$ = build(IMAG, $2, NULL); 1845 } 1846 | T_EXTENSION cast_expression { /* GCC c_parser_unary_expression */ 1847 $$ = $2; 1848 } 1849 | T_SIZEOF unary_expression { 1850 $$ = $2 == NULL ? NULL : build_sizeof($2->tn_type); 1851 if ($$ != NULL) 1852 check_expr_misc($2, false, false, false, false, false, true); 1853 } 1854 | T_SIZEOF T_LPAREN type_name T_RPAREN { 1855 $$ = build_sizeof($3); 1856 } 1857 | T_ALIGNOF T_LPAREN type_name T_RPAREN { /* C11 6.5.3 */ 1858 $$ = build_alignof($3); 1859 } 1860 ; 1861 1862 cast_expression: /* see C99 6.5.1 */ 1863 unary_expression 1864 | T_LPAREN type_name T_RPAREN cast_expression { 1865 $$ = cast($4, $2); 1866 } 1867 ; 1868 1869 generic_selection: /* C11 6.5.1.1 */ 1870 T_GENERIC T_LPAREN assignment_expression T_COMMA 1871 generic_assoc_list T_RPAREN { 1872 /* generic selection requires C11 or later */ 1873 c11ism(345); 1874 $$ = build_generic_selection($3, $5); 1875 } 1876 ; 1877 1878 generic_assoc_list: /* C11 6.5.1.1 */ 1879 generic_association 1880 | generic_assoc_list T_COMMA generic_association { 1881 $3->ga_prev = $1; 1882 $$ = $3; 1883 } 1884 ; 1885 1886 generic_association: /* C11 6.5.1.1 */ 1887 type_name T_COLON assignment_expression { 1888 $$ = getblk(sizeof(*$$)); 1889 $$->ga_arg = $1; 1890 $$->ga_result = $3; 1891 } 1892 | T_DEFAULT T_COLON assignment_expression { 1893 $$ = getblk(sizeof(*$$)); 1894 $$->ga_arg = NULL; 1895 $$->ga_result = $3; 1896 } 1897 ; 1898 1899 argument_expression_list: /* C99 6.5.2 */ 1900 expr %prec T_COMMA { 1901 $$ = new_function_argument_node(NULL, $1); 1902 } 1903 | argument_expression_list T_COMMA expr { 1904 $$ = new_function_argument_node($1, $3); 1905 } 1906 ; 1907 1908 /* 1909 * The inner part of a GCC statement-expression of the form ({ ... }). 1910 * 1911 * https://gcc.gnu.org/onlinedocs/gcc/Statement-Exprs.html 1912 */ 1913 gcc_statement_expr_list: 1914 gcc_statement_expr_item 1915 | gcc_statement_expr_list gcc_statement_expr_item { 1916 $$ = $2; 1917 } 1918 ; 1919 1920 gcc_statement_expr_item: 1921 declaration { 1922 clear_warning_flags(); 1923 $$ = NULL; 1924 } 1925 | non_expr_statement { 1926 $$ = expr_zalloc_tnode(); 1927 $$->tn_type = gettyp(VOID); 1928 } 1929 | expr T_SEMI { 1930 if ($1 == NULL) { /* in case of syntax errors */ 1931 $$ = expr_zalloc_tnode(); 1932 $$->tn_type = gettyp(VOID); 1933 } else { 1934 /* XXX: do that only on the last name */ 1935 if ($1->tn_op == NAME) 1936 $1->tn_sym->s_used = true; 1937 $$ = $1; 1938 expr($1, false, false, false, false); 1939 seen_fallthrough = false; 1940 } 1941 } 1942 ; 1943 1944 string: 1945 T_STRING 1946 | T_STRING string2 { 1947 $$ = cat_strings($1, $2); 1948 } 1949 ; 1950 1951 string2: 1952 T_STRING { 1953 if (tflag) { 1954 /* concatenated strings are illegal in traditional C */ 1955 warning(219); 1956 } 1957 $$ = $1; 1958 } 1959 | string2 T_STRING { 1960 $$ = cat_strings($1, $2); 1961 } 1962 ; 1963 1964 point_or_arrow: 1965 T_POINT { 1966 symtyp = FMEMBER; 1967 $$ = POINT; 1968 } 1969 | T_ARROW { 1970 symtyp = FMEMBER; 1971 $$ = ARROW; 1972 } 1973 ; 1974 1975 identifier_sym: 1976 identifier { 1977 $$ = getsym($1); 1978 } 1979 ; 1980 1981 identifier: /* C99 6.4.2.1 */ 1982 T_NAME { 1983 $$ = $1; 1984 cgram_debug("name '%s'", $$->sb_name); 1985 } 1986 | T_TYPENAME { 1987 $$ = $1; 1988 cgram_debug("typename '%s'", $$->sb_name); 1989 } 1990 ; 1991 1992 comma_opt: 1993 /* empty */ 1994 | T_COMMA 1995 ; 1996 1997 gcc_attribute_spec_list: 1998 gcc_attribute_spec 1999 | gcc_attribute_spec_list T_COMMA gcc_attribute_spec 2000 ; 2001 2002 gcc_attribute_spec: 2003 /* empty */ 2004 | T_AT_ALWAYS_INLINE 2005 | T_AT_ALIAS T_LPAREN string T_RPAREN 2006 | T_AT_ALIGNED T_LPAREN constant_expr T_RPAREN 2007 | T_AT_ALIGNED 2008 | T_AT_ALLOC_SIZE T_LPAREN constant_expr T_COMMA constant_expr T_RPAREN 2009 | T_AT_ALLOC_SIZE T_LPAREN constant_expr T_RPAREN 2010 | T_AT_BOUNDED T_LPAREN gcc_attribute_bounded 2011 T_COMMA constant_expr T_COMMA constant_expr T_RPAREN 2012 | T_AT_COLD 2013 | T_AT_COMMON 2014 | T_AT_CONSTRUCTOR T_LPAREN constant_expr T_RPAREN 2015 | T_AT_CONSTRUCTOR 2016 | T_AT_DEPRECATED T_LPAREN string T_RPAREN 2017 | T_AT_DEPRECATED 2018 | T_AT_DESTRUCTOR T_LPAREN constant_expr T_RPAREN 2019 | T_AT_DESTRUCTOR 2020 | T_AT_FALLTHROUGH { 2021 fallthru(1); 2022 } 2023 | T_AT_FORMAT T_LPAREN gcc_attribute_format T_COMMA 2024 constant_expr T_COMMA constant_expr T_RPAREN 2025 | T_AT_FORMAT_ARG T_LPAREN constant_expr T_RPAREN 2026 | T_AT_GNU_INLINE 2027 | T_AT_HOT 2028 | T_AT_MALLOC 2029 | T_AT_MAY_ALIAS 2030 | T_AT_MODE T_LPAREN T_NAME T_RPAREN 2031 | T_AT_NOINLINE 2032 | T_AT_NONNULL T_LPAREN constant_expr_list_opt T_RPAREN 2033 | T_AT_NONNULL 2034 | T_AT_NONSTRING 2035 | T_AT_NORETURN 2036 | T_AT_NOTHROW 2037 | T_AT_NO_INSTRUMENT_FUNCTION 2038 | T_AT_OPTIMIZE T_LPAREN string T_RPAREN 2039 | T_AT_PACKED { 2040 addpacked(); 2041 } 2042 | T_AT_PCS T_LPAREN string T_RPAREN 2043 | T_AT_PURE 2044 | T_AT_RETURNS_TWICE 2045 | T_AT_SECTION T_LPAREN string T_RPAREN 2046 | T_AT_SENTINEL T_LPAREN constant_expr T_RPAREN 2047 | T_AT_SENTINEL 2048 | T_AT_TLS_MODEL T_LPAREN string T_RPAREN 2049 | T_AT_TUNION 2050 | T_AT_UNUSED { 2051 add_attr_used(); 2052 } 2053 | T_AT_USED { 2054 add_attr_used(); 2055 } 2056 | T_AT_VISIBILITY T_LPAREN constant_expr T_RPAREN 2057 | T_AT_WARN_UNUSED_RESULT 2058 | T_AT_WEAK 2059 | T_QUAL { 2060 if ($1 != CONST) 2061 yyerror("Bad attribute"); 2062 } 2063 ; 2064 2065 gcc_attribute_bounded: 2066 T_AT_MINBYTES 2067 | T_AT_STRING 2068 | T_AT_BUFFER 2069 ; 2070 2071 gcc_attribute_format: 2072 T_AT_FORMAT_GNU_PRINTF 2073 | T_AT_FORMAT_PRINTF 2074 | T_AT_FORMAT_SCANF 2075 | T_AT_FORMAT_STRFMON 2076 | T_AT_FORMAT_STRFTIME 2077 | T_AT_FORMAT_SYSLOG 2078 ; 2079 2080 %% 2081 2082 /* ARGSUSED */ 2083 int 2084 yyerror(const char *msg) 2085 { 2086 /* syntax error '%s' */ 2087 error(249, yytext); 2088 if (++sytxerr >= 5) 2089 norecover(); 2090 return 0; 2091 } 2092 2093 static void 2094 cgram_declare(sym_t *decl, bool initflg, sbuf_t *renaming) 2095 { 2096 declare(decl, initflg, renaming); 2097 if (renaming != NULL) 2098 freeyyv(&renaming, T_NAME); 2099 } 2100 2101 /* 2102 * Discard all input tokens up to and including the next 2103 * unmatched right paren 2104 */ 2105 static void 2106 ignore_up_to_rparen(void) 2107 { 2108 int level; 2109 2110 if (yychar < 0) 2111 yychar = yylex(); 2112 freeyyv(&yylval, yychar); 2113 2114 level = 1; 2115 while (yychar != T_RPAREN || --level > 0) { 2116 if (yychar == T_LPAREN) { 2117 level++; 2118 } else if (yychar <= 0) { 2119 break; 2120 } 2121 freeyyv(&yylval, yychar = yylex()); 2122 } 2123 2124 yyclearin; 2125 } 2126 2127 static sym_t * 2128 symbolrename(sym_t *s, sbuf_t *sb) 2129 { 2130 if (sb != NULL) 2131 s->s_rename = sb->sb_name; 2132 return s; 2133 } 2134
Indexes created Sat Oct 11 19:10:01 GMT 2025