cgram.y revision 1.311
1 %{ 2 /* $NetBSD: cgram.y,v 1.311 2021/07/11 18:22:02 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 1.311 2021/07/11 18:22:02 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 168 128 129 %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_MALLOC 235 %token T_AT_MAY_ALIAS 236 %token T_AT_MINBYTES 237 %token T_AT_MODE 238 %token T_AT_NOINLINE 239 %token T_AT_NONNULL 240 %token T_AT_NONSTRING 241 %token T_AT_NORETURN 242 %token T_AT_NOTHROW 243 %token T_AT_NO_INSTRUMENT_FUNCTION 244 %token T_AT_OPTIMIZE 245 %token T_AT_PACKED 246 %token T_AT_PCS 247 %token T_AT_PURE 248 %token T_AT_RETURNS_TWICE 249 %token T_AT_SECTION 250 %token T_AT_SENTINEL 251 %token T_AT_STRING 252 %token T_AT_TLS_MODEL 253 %token T_AT_TUNION 254 %token T_AT_UNUSED 255 %token T_AT_USED 256 %token T_AT_VISIBILITY 257 %token T_AT_WARN_UNUSED_RESULT 258 %token T_AT_WEAK 259 260 %left T_COMMA 261 %right T_ASSIGN T_OPASSIGN 262 %right T_QUEST T_COLON 263 %left T_LOGOR 264 %left T_LOGAND 265 %left T_BITOR 266 %left T_BITXOR 267 %left T_AMPER 268 %left T_EQUALITY 269 %left T_RELATIONAL 270 %left T_SHIFT 271 %left T_ADDITIVE 272 %left T_ASTERISK T_MULTIPLICATIVE 273 274 %token <y_name> T_NAME 275 %token <y_name> T_TYPENAME 276 %token <y_val> T_CON 277 %token <y_string> T_STRING 278 279 %type <y_tnode> primary_expression 280 %type <y_tnode> postfix_expression 281 %type <y_tnode> unary_expression 282 283 %type <y_sym> func_decl 284 %type <y_sym> notype_decl 285 %type <y_sym> type_decl 286 %type <y_type> type_specifier 287 %type <y_type> begin_type_typespec 288 %type <y_type> notype_type_specifier 289 %type <y_type> struct_or_union_specifier 290 %type <y_type> enum_specifier 291 %type <y_tspec> struct_or_union 292 %type <y_sym> braced_struct_declaration_list 293 %type <y_sym> identifier_sym 294 %type <y_name> identifier 295 %type <y_sym> struct_declaration_list_with_rbrace 296 %type <y_sym> struct_declaration_list 297 %type <y_sym> struct_declaration 298 %type <y_sym> notype_member_decls 299 %type <y_sym> type_member_decls 300 %type <y_sym> notype_member_decl 301 %type <y_sym> type_member_decl 302 %type <y_tnode> constant_expr 303 %type <y_tnode> array_size 304 %type <y_sym> enum_declaration 305 %type <y_sym> enums_with_opt_comma 306 %type <y_sym> enumerator_list 307 %type <y_sym> enumerator 308 %type <y_sym> notype_direct_decl 309 %type <y_sym> type_direct_decl 310 %type <y_qual_ptr> pointer 311 %type <y_qual_ptr> asterisk 312 %type <y_sym> type_param_decl 313 %type <y_sym> param_list 314 %type <y_sym> abstract_decl_param_list 315 %type <y_sym> direct_param_decl 316 %type <y_sym> notype_param_decl 317 %type <y_sym> direct_notype_param_decl 318 %type <y_qual_ptr> type_qualifier_list_opt 319 %type <y_qual_ptr> type_qualifier_list 320 %type <y_qual_ptr> type_qualifier 321 %type <y_sym> identifier_list 322 %type <y_sym> abstract_declarator 323 %type <y_sym> direct_abstract_declarator 324 %type <y_sym> vararg_parameter_type_list 325 %type <y_sym> parameter_type_list 326 %type <y_sym> parameter_declaration 327 %type <y_tnode> expr 328 %type <y_tnode> assignment_expression 329 %type <y_tnode> gcc_statement_expr_list 330 %type <y_tnode> gcc_statement_expr_item 331 %type <y_tnode> term 332 %type <y_tnode> generic_selection 333 %type <y_tnode> argument_expression_list 334 %type <y_op> point_or_arrow 335 %type <y_type> type_name 336 %type <y_sym> abstract_declaration 337 %type <y_tnode> do_while_expr 338 %type <y_tnode> expr_opt 339 %type <y_string> string 340 %type <y_string> string2 341 %type <y_name> asm_or_symbolrename_opt 342 %type <y_range> range 343 %type <y_seen_statement> block_item_list 344 %type <y_seen_statement> block_item 345 %type <y_generic> generic_assoc_list 346 %type <y_generic> generic_association 347 348 %% 349 350 program: 351 /* empty */ { 352 if (sflag) { 353 /* empty translation unit */ 354 error(272); 355 } else if (!tflag) { 356 /* empty translation unit */ 357 warning(272); 358 } 359 } 360 | translation_unit 361 ; 362 363 translation_unit: /* C99 6.9 */ 364 external_declaration 365 | translation_unit external_declaration 366 ; 367 368 external_declaration: /* C99 6.9 */ 369 asm_statement 370 | function_definition { 371 global_clean_up_decl(false); 372 clear_warning_flags(); 373 } 374 | top_level_declaration { 375 global_clean_up_decl(false); 376 clear_warning_flags(); 377 } 378 ; 379 380 /* 381 * On the top level, lint allows several forms of declarations that it doesn't 382 * allow in functions. For example, a single ';' is an empty declaration and 383 * is supported by some compilers, but in a function it would be an empty 384 * statement, not a declaration. This makes a difference in C90 mode, where 385 * a statement must not be followed by a declaration. 386 * 387 * See 'declaration' for all other declarations. 388 */ 389 top_level_declaration: /* C99 6.9 calls this 'declaration' */ 390 T_SEMI { 391 if (sflag) { 392 /* empty declaration */ 393 error(0); 394 } else if (!tflag) { 395 /* empty declaration */ 396 warning(0); 397 } 398 } 399 | begin_type end_type notype_init_decls T_SEMI { 400 if (sflag) { 401 /* old style declaration; add 'int' */ 402 error(1); 403 } else if (!tflag) { 404 /* old style declaration; add 'int' */ 405 warning(1); 406 } 407 } 408 | begin_type_declmods end_type T_SEMI { 409 if (dcs->d_scl == TYPEDEF) { 410 /* typedef declares no type name */ 411 warning(72); 412 } else { 413 /* empty declaration */ 414 warning(2); 415 } 416 } 417 | begin_type_declmods end_type notype_init_decls T_SEMI 418 | begin_type_declaration_specifiers end_type T_SEMI { 419 if (dcs->d_scl == TYPEDEF) { 420 /* typedef declares no type name */ 421 warning(72); 422 } else if (!dcs->d_nonempty_decl) { 423 /* empty declaration */ 424 warning(2); 425 } 426 } 427 | begin_type_declaration_specifiers end_type type_init_decls T_SEMI 428 | error T_SEMI { 429 global_clean_up(); 430 } 431 | error T_RBRACE { 432 global_clean_up(); 433 } 434 ; 435 436 function_definition: /* C99 6.9.1 */ 437 func_decl { 438 if ($1->s_type->t_tspec != FUNC) { 439 /* syntax error '%s' */ 440 error(249, yytext); 441 YYERROR; 442 } 443 if ($1->s_type->t_typedef) { 444 /* ()-less function definition */ 445 error(64); 446 YYERROR; 447 } 448 funcdef($1); 449 block_level++; 450 begin_declaration_level(ARG); 451 if (lwarn == LWARN_NONE) 452 $1->s_used = true; 453 } arg_declaration_list_opt { 454 end_declaration_level(); 455 block_level--; 456 check_func_lint_directives(); 457 check_func_old_style_arguments(); 458 begin_control_statement(CS_FUNCTION_BODY); 459 } compound_statement { 460 funcend(); 461 end_control_statement(CS_FUNCTION_BODY); 462 } 463 ; 464 465 func_decl: 466 begin_type end_type notype_decl { 467 $$ = $3; 468 } 469 | begin_type_declmods end_type notype_decl { 470 $$ = $3; 471 } 472 | begin_type_declaration_specifiers end_type type_decl { 473 $$ = $3; 474 } 475 ; 476 477 arg_declaration_list_opt: /* C99 6.9.1p13 example 1 */ 478 /* empty */ 479 | arg_declaration_list 480 ; 481 482 arg_declaration_list: /* C99 6.9.1p13 example 1 */ 483 arg_declaration 484 | arg_declaration_list arg_declaration 485 /* XXX or better "arg_declaration error" ? */ 486 | error 487 ; 488 489 /* 490 * "arg_declaration" is separated from "declaration" because it 491 * needs other error handling. 492 */ 493 arg_declaration: 494 begin_type_declmods end_type T_SEMI { 495 /* empty declaration */ 496 warning(2); 497 } 498 | begin_type_declmods end_type notype_init_decls T_SEMI 499 | begin_type_declaration_specifiers end_type T_SEMI { 500 if (!dcs->d_nonempty_decl) { 501 /* empty declaration */ 502 warning(2); 503 } else { 504 /* '%s' declared in argument declaration list */ 505 warning(3, type_name(dcs->d_type)); 506 } 507 } 508 | begin_type_declaration_specifiers end_type type_init_decls T_SEMI { 509 if (dcs->d_nonempty_decl) { 510 /* '%s' declared in argument declaration list */ 511 warning(3, type_name(dcs->d_type)); 512 } 513 } 514 | begin_type_declmods error 515 | begin_type_declaration_specifiers error 516 ; 517 518 declaration: /* C99 6.7 */ 519 begin_type_declmods end_type T_SEMI { 520 if (dcs->d_scl == TYPEDEF) { 521 /* typedef declares no type name */ 522 warning(72); 523 } else { 524 /* empty declaration */ 525 warning(2); 526 } 527 } 528 | begin_type_declmods end_type notype_init_decls T_SEMI 529 | begin_type_declaration_specifiers end_type T_SEMI { 530 if (dcs->d_scl == TYPEDEF) { 531 /* typedef declares no type name */ 532 warning(72); 533 } else if (!dcs->d_nonempty_decl) { 534 /* empty declaration */ 535 warning(2); 536 } 537 } 538 | begin_type_declaration_specifiers end_type type_init_decls T_SEMI 539 | error T_SEMI 540 ; 541 542 begin_type: 543 /* empty */ { 544 begin_type(); 545 } 546 ; 547 548 end_type: 549 /* empty */ { 550 end_type(); 551 } 552 ; 553 554 begin_type_declaration_specifiers: /* see C99 6.7 */ 555 begin_type_typespec { 556 add_type($1); 557 } 558 | begin_type_declmods type_specifier { 559 add_type($2); 560 } 561 | type_attribute begin_type_declaration_specifiers 562 | begin_type_declaration_specifiers declmod 563 | begin_type_declaration_specifiers notype_type_specifier { 564 add_type($2); 565 } 566 ; 567 568 begin_type_declmods: 569 begin_type T_QUAL { 570 add_qualifier($2); 571 } 572 | begin_type T_SCLASS { 573 add_storage_class($2); 574 } 575 | begin_type_declmods declmod 576 ; 577 578 declmod: 579 T_QUAL { 580 add_qualifier($1); 581 } 582 | T_SCLASS { 583 add_storage_class($1); 584 } 585 | type_attribute_list 586 ; 587 588 begin_type_typespec: 589 begin_type notype_type_specifier { 590 $$ = $2; 591 } 592 | T_TYPENAME begin_type { 593 $$ = getsym($1)->s_type; 594 } 595 ; 596 597 type_attribute_list: 598 type_attribute 599 | type_attribute_list type_attribute 600 ; 601 602 type_attribute_opt: 603 /* empty */ 604 | type_attribute 605 ; 606 607 type_attribute: /* See C11 6.7 declaration-specifiers */ 608 T_ATTRIBUTE T_LPAREN T_LPAREN { 609 attron = true; 610 } gcc_attribute_spec_list { 611 attron = false; 612 } T_RPAREN T_RPAREN 613 | T_ALIGNAS T_LPAREN align_as T_RPAREN 614 | T_PACKED { 615 addpacked(); 616 } 617 | T_NORETURN 618 ; 619 620 type_specifier: /* C99 6.7.2 */ 621 notype_type_specifier 622 | T_TYPENAME { 623 $$ = getsym($1)->s_type; 624 } 625 ; 626 627 notype_type_specifier: 628 T_TYPE { 629 $$ = gettyp($1); 630 } 631 | T_TYPEOF term { 632 $$ = $2->tn_type; 633 } 634 | struct_or_union_specifier { 635 end_declaration_level(); 636 $$ = $1; 637 } 638 | enum_specifier { 639 end_declaration_level(); 640 $$ = $1; 641 } 642 ; 643 644 struct_or_union_specifier: /* C99 6.7.2.1 */ 645 struct_or_union identifier_sym { 646 /* 647 * STDC requires that "struct a;" always introduces 648 * a new tag if "a" is not declared at current level 649 * 650 * yychar is valid because otherwise the parser would not 651 * have been able to decide if it must shift or reduce 652 */ 653 $$ = mktag($2, $1, false, yychar == T_SEMI); 654 } 655 | struct_or_union identifier_sym { 656 dcs->d_tagtyp = mktag($2, $1, true, false); 657 } braced_struct_declaration_list { 658 $$ = complete_tag_struct_or_union(dcs->d_tagtyp, $4); 659 } 660 | struct_or_union { 661 dcs->d_tagtyp = mktag(NULL, $1, true, false); 662 } braced_struct_declaration_list { 663 $$ = complete_tag_struct_or_union(dcs->d_tagtyp, $3); 664 } 665 | struct_or_union error { 666 symtyp = FVFT; 667 $$ = gettyp(INT); 668 } 669 ; 670 671 struct_or_union: /* C99 6.7.2.1 */ 672 struct_or_union type_attribute 673 | T_STRUCT_OR_UNION { 674 symtyp = FTAG; 675 begin_declaration_level($1 == STRUCT ? MOS : MOU); 676 dcs->d_offset = 0; 677 dcs->d_sou_align_in_bits = CHAR_SIZE; 678 $$ = $1; 679 } 680 ; 681 682 braced_struct_declaration_list: 683 struct_declaration_lbrace struct_declaration_list_with_rbrace { 684 $$ = $2; 685 } 686 ; 687 688 struct_declaration_lbrace: 689 T_LBRACE { 690 symtyp = FVFT; 691 } 692 ; 693 694 struct_declaration_list_with_rbrace: 695 struct_declaration_list T_SEMI T_RBRACE 696 | struct_declaration_list T_RBRACE { 697 if (sflag) { 698 /* syntax req. ';' after last struct/union member */ 699 error(66); 700 } else { 701 /* syntax req. ';' after last struct/union member */ 702 warning(66); 703 } 704 $$ = $1; 705 } 706 | T_RBRACE { 707 $$ = NULL; 708 } 709 ; 710 711 struct_declaration_list: 712 struct_declaration 713 | struct_declaration_list T_SEMI struct_declaration { 714 $$ = lnklst($1, $3); 715 } 716 ; 717 718 struct_declaration: 719 begin_type_noclass_declmods end_type { 720 /* too late, i know, but getsym() compensates it */ 721 symtyp = FMEMBER; 722 } notype_member_decls type_attribute_opt { 723 symtyp = FVFT; 724 $$ = $4; 725 } 726 | begin_type_noclass_declspecs end_type { 727 symtyp = FMEMBER; 728 } type_member_decls type_attribute_opt { 729 symtyp = FVFT; 730 $$ = $4; 731 } 732 | begin_type_noclass_declmods end_type type_attribute_opt { 733 /* syntax error '%s' */ 734 error(249, "member without type"); 735 $$ = NULL; 736 } 737 | begin_type_noclass_declspecs end_type type_attribute_opt { 738 symtyp = FVFT; 739 if (!Sflag) 740 /* anonymous struct/union members is a C9X feature */ 741 warning(49); 742 if (is_struct_or_union(dcs->d_type->t_tspec)) { 743 $$ = dcs->d_type->t_str->sou_first_member; 744 /* add all the members of the anonymous struct/union */ 745 anonymize($$); 746 } else { 747 /* syntax error '%s' */ 748 error(249, "unnamed member"); 749 $$ = NULL; 750 } 751 } 752 | error { 753 symtyp = FVFT; 754 $$ = NULL; 755 } 756 ; 757 758 begin_type_noclass_declspecs: 759 begin_type_typespec { 760 add_type($1); 761 } 762 | type_attribute begin_type_noclass_declspecs 763 | begin_type_noclass_declmods type_specifier { 764 add_type($2); 765 } 766 | begin_type_noclass_declspecs T_QUAL { 767 add_qualifier($2); 768 } 769 | begin_type_noclass_declspecs notype_type_specifier { 770 add_type($2); 771 } 772 | begin_type_noclass_declspecs type_attribute 773 ; 774 775 begin_type_noclass_declmods: 776 begin_type T_QUAL { 777 add_qualifier($2); 778 } 779 | begin_type_noclass_declmods T_QUAL { 780 add_qualifier($2); 781 } 782 ; 783 784 notype_member_decls: 785 notype_member_decl { 786 $$ = declarator_1_struct_union($1); 787 } 788 | notype_member_decls { 789 symtyp = FMEMBER; 790 } T_COMMA type_member_decl { 791 $$ = lnklst($1, declarator_1_struct_union($4)); 792 } 793 ; 794 795 type_member_decls: 796 type_member_decl { 797 $$ = declarator_1_struct_union($1); 798 } 799 | type_member_decls { 800 symtyp = FMEMBER; 801 } T_COMMA type_member_decl { 802 $$ = lnklst($1, declarator_1_struct_union($4)); 803 } 804 ; 805 806 notype_member_decl: 807 notype_decl 808 | notype_decl T_COLON constant_expr { /* C99 6.7.2.1 */ 809 $$ = bitfield($1, to_int_constant($3, true)); 810 } 811 | { 812 symtyp = FVFT; 813 } T_COLON constant_expr { /* C99 6.7.2.1 */ 814 $$ = bitfield(NULL, to_int_constant($3, true)); 815 } 816 ; 817 818 type_member_decl: 819 type_decl 820 | type_decl T_COLON constant_expr { 821 $$ = bitfield($1, to_int_constant($3, true)); 822 } 823 | { 824 symtyp = FVFT; 825 } T_COLON constant_expr { 826 $$ = bitfield(NULL, to_int_constant($3, true)); 827 } 828 ; 829 830 enum_specifier: /* C99 6.7.2.2 */ 831 enum identifier_sym { 832 $$ = mktag($2, ENUM, false, false); 833 } 834 | enum identifier_sym { 835 dcs->d_tagtyp = mktag($2, ENUM, true, false); 836 } enum_declaration { 837 $$ = complete_tag_enum(dcs->d_tagtyp, $4); 838 } 839 | enum { 840 dcs->d_tagtyp = mktag(NULL, ENUM, true, false); 841 } enum_declaration { 842 $$ = complete_tag_enum(dcs->d_tagtyp, $3); 843 } 844 | enum error { 845 symtyp = FVFT; 846 $$ = gettyp(INT); 847 } 848 ; 849 850 enum: 851 T_ENUM { 852 symtyp = FTAG; 853 begin_declaration_level(CTCONST); 854 } 855 ; 856 857 enum_declaration: 858 enum_decl_lbrace enums_with_opt_comma T_RBRACE { 859 $$ = $2; 860 } 861 ; 862 863 enum_decl_lbrace: 864 T_LBRACE { 865 symtyp = FVFT; 866 enumval = 0; 867 } 868 ; 869 870 enums_with_opt_comma: 871 enumerator_list 872 | enumerator_list T_COMMA { 873 if (sflag) { 874 /* trailing ',' prohibited in enum declaration */ 875 error(54); 876 } else { 877 /* trailing ',' prohibited in enum declaration */ 878 c99ism(54); 879 } 880 $$ = $1; 881 } 882 ; 883 884 enumerator_list: 885 enumerator 886 | enumerator_list T_COMMA enumerator { 887 $$ = lnklst($1, $3); 888 } 889 | error { 890 $$ = NULL; 891 } 892 ; 893 894 enumerator: /* C99 6.7.2.2 */ 895 identifier_sym { 896 $$ = enumeration_constant($1, enumval, true); 897 } 898 | identifier_sym T_ASSIGN constant_expr { 899 $$ = enumeration_constant($1, to_int_constant($3, true), false); 900 } 901 ; 902 903 904 /* 905 * For an explanation of 'notype' in the following rules, see the Bison 906 * manual, section 7.1 "Semantic Info in Token Kinds". 907 */ 908 909 notype_init_decls: 910 notype_init_decl 911 | notype_init_decls T_COMMA type_init_decl 912 ; 913 914 type_init_decls: 915 type_init_decl 916 | type_init_decls T_COMMA type_init_decl 917 ; 918 919 notype_init_decl: 920 notype_decl asm_or_symbolrename_opt { 921 cgram_declare($1, false, $2); 922 check_size($1); 923 } 924 | notype_decl asm_or_symbolrename_opt { 925 begin_initialization($1); 926 cgram_declare($1, true, $2); 927 } T_ASSIGN initializer { 928 check_size($1); 929 end_initialization(); 930 } 931 ; 932 933 type_init_decl: 934 type_decl asm_or_symbolrename_opt { 935 cgram_declare($1, false, $2); 936 check_size($1); 937 } 938 | type_decl asm_or_symbolrename_opt { 939 begin_initialization($1); 940 cgram_declare($1, true, $2); 941 } T_ASSIGN initializer { 942 check_size($1); 943 end_initialization(); 944 } 945 ; 946 947 notype_decl: 948 notype_direct_decl 949 | pointer notype_direct_decl { 950 $$ = add_pointer($2, $1); 951 } 952 ; 953 954 type_decl: 955 type_direct_decl 956 | pointer type_direct_decl { 957 $$ = add_pointer($2, $1); 958 } 959 ; 960 961 notype_direct_decl: 962 T_NAME { 963 $$ = declarator_name(getsym($1)); 964 } 965 | T_LPAREN type_decl T_RPAREN { 966 $$ = $2; 967 } 968 | type_attribute notype_direct_decl { 969 $$ = $2; 970 } 971 | notype_direct_decl T_LBRACK T_RBRACK { 972 $$ = add_array($1, false, 0); 973 } 974 | notype_direct_decl T_LBRACK array_size T_RBRACK { 975 $$ = add_array($1, true, to_int_constant($3, false)); 976 } 977 | notype_direct_decl param_list asm_or_symbolrename_opt { 978 $$ = add_function(symbolrename($1, $3), $2); 979 end_declaration_level(); 980 block_level--; 981 } 982 | notype_direct_decl type_attribute 983 ; 984 985 type_direct_decl: 986 identifier { 987 $$ = declarator_name(getsym($1)); 988 } 989 | T_LPAREN type_decl T_RPAREN { 990 $$ = $2; 991 } 992 | type_attribute type_direct_decl { 993 $$ = $2; 994 } 995 | type_direct_decl T_LBRACK T_RBRACK { 996 $$ = add_array($1, false, 0); 997 } 998 | type_direct_decl T_LBRACK array_size T_RBRACK { 999 $$ = add_array($1, true, to_int_constant($3, false)); 1000 } 1001 | type_direct_decl param_list asm_or_symbolrename_opt { 1002 $$ = add_function(symbolrename($1, $3), $2); 1003 end_declaration_level(); 1004 block_level--; 1005 } 1006 | type_direct_decl type_attribute 1007 ; 1008 1009 /* 1010 * The two distinct rules type_param_decl and notype_param_decl avoid a 1011 * conflict in argument lists. A typename enclosed in parentheses is always 1012 * treated as a typename, not an argument name. For example, after 1013 * "typedef double a;", the declaration "f(int (a));" is interpreted as 1014 * "f(int (double));", not "f(int a);". 1015 */ 1016 type_param_decl: 1017 direct_param_decl 1018 | pointer direct_param_decl { 1019 $$ = add_pointer($2, $1); 1020 } 1021 ; 1022 1023 array_size: 1024 type_qualifier_list_opt T_SCLASS constant_expr { 1025 /* C11 6.7.6.3p7 */ 1026 if ($2 != STATIC) 1027 yyerror("Bad attribute"); 1028 /* static array size is a C11 extension */ 1029 c11ism(343); 1030 $$ = $3; 1031 } 1032 | constant_expr 1033 ; 1034 1035 direct_param_decl: 1036 identifier type_attribute_list { 1037 $$ = declarator_name(getsym($1)); 1038 } 1039 | identifier { 1040 $$ = declarator_name(getsym($1)); 1041 } 1042 | T_LPAREN notype_param_decl T_RPAREN { 1043 $$ = $2; 1044 } 1045 | direct_param_decl T_LBRACK T_RBRACK { 1046 $$ = add_array($1, false, 0); 1047 } 1048 | direct_param_decl T_LBRACK array_size T_RBRACK { 1049 $$ = add_array($1, true, to_int_constant($3, false)); 1050 } 1051 | direct_param_decl param_list asm_or_symbolrename_opt { 1052 $$ = add_function(symbolrename($1, $3), $2); 1053 end_declaration_level(); 1054 block_level--; 1055 } 1056 ; 1057 1058 notype_param_decl: 1059 direct_notype_param_decl 1060 | pointer direct_notype_param_decl { 1061 $$ = add_pointer($2, $1); 1062 } 1063 ; 1064 1065 direct_notype_param_decl: 1066 identifier { 1067 $$ = declarator_name(getsym($1)); 1068 } 1069 | T_LPAREN notype_param_decl T_RPAREN { 1070 $$ = $2; 1071 } 1072 | direct_notype_param_decl T_LBRACK T_RBRACK { 1073 $$ = add_array($1, false, 0); 1074 } 1075 | direct_notype_param_decl T_LBRACK array_size T_RBRACK { 1076 $$ = add_array($1, true, to_int_constant($3, false)); 1077 } 1078 | direct_notype_param_decl param_list asm_or_symbolrename_opt { 1079 $$ = add_function(symbolrename($1, $3), $2); 1080 end_declaration_level(); 1081 block_level--; 1082 } 1083 ; 1084 1085 pointer: /* C99 6.7.5 */ 1086 asterisk type_qualifier_list_opt { 1087 $$ = merge_qualified_pointer($1, $2); 1088 } 1089 | asterisk type_qualifier_list_opt pointer { 1090 $$ = merge_qualified_pointer($1, $2); 1091 $$ = merge_qualified_pointer($$, $3); 1092 } 1093 ; 1094 1095 asterisk: 1096 T_ASTERISK { 1097 $$ = xcalloc(1, sizeof(*$$)); 1098 $$->p_pointer = true; 1099 } 1100 ; 1101 1102 type_qualifier_list_opt: 1103 /* empty */ { 1104 $$ = NULL; 1105 } 1106 | type_qualifier_list 1107 ; 1108 1109 type_qualifier_list: /* C99 6.7.5 */ 1110 type_qualifier 1111 | type_qualifier_list type_qualifier { 1112 $$ = merge_qualified_pointer($1, $2); 1113 } 1114 ; 1115 1116 type_qualifier: 1117 T_QUAL { 1118 $$ = xcalloc(1, sizeof(*$$)); 1119 if ($1 == CONST) { 1120 $$->p_const = true; 1121 } else if ($1 == VOLATILE) { 1122 $$->p_volatile = true; 1123 } else { 1124 lint_assert($1 == RESTRICT || $1 == THREAD); 1125 } 1126 } 1127 ; 1128 1129 align_as: /* See alignment-specifier in C11 6.7.5 */ 1130 type_specifier 1131 | constant_expr 1132 ; 1133 1134 param_list: 1135 id_list_lparen identifier_list T_RPAREN { 1136 $$ = $2; 1137 } 1138 | abstract_decl_param_list 1139 ; 1140 1141 id_list_lparen: 1142 T_LPAREN { 1143 block_level++; 1144 begin_declaration_level(PROTO_ARG); 1145 } 1146 ; 1147 1148 identifier_list: 1149 T_NAME { 1150 $$ = old_style_function_name(getsym($1)); 1151 } 1152 | identifier_list T_COMMA T_NAME { 1153 $$ = lnklst($1, old_style_function_name(getsym($3))); 1154 } 1155 | identifier_list error 1156 ; 1157 1158 abstract_decl_param_list: 1159 abstract_decl_lparen T_RPAREN type_attribute_opt { 1160 $$ = NULL; 1161 } 1162 | abstract_decl_lparen vararg_parameter_type_list T_RPAREN type_attribute_opt { 1163 dcs->d_proto = true; 1164 $$ = $2; 1165 } 1166 | abstract_decl_lparen error T_RPAREN type_attribute_opt { 1167 $$ = NULL; 1168 } 1169 ; 1170 1171 abstract_decl_lparen: 1172 T_LPAREN { 1173 block_level++; 1174 begin_declaration_level(PROTO_ARG); 1175 } 1176 ; 1177 1178 vararg_parameter_type_list: 1179 parameter_type_list 1180 | parameter_type_list T_COMMA T_ELLIPSIS { 1181 dcs->d_vararg = true; 1182 $$ = $1; 1183 } 1184 | T_ELLIPSIS { 1185 if (sflag) { 1186 /* ANSI C requires formal parameter before '...' */ 1187 error(84); 1188 } else if (!tflag) { 1189 /* ANSI C requires formal parameter before '...' */ 1190 warning(84); 1191 } 1192 dcs->d_vararg = true; 1193 $$ = NULL; 1194 } 1195 ; 1196 1197 parameter_type_list: 1198 parameter_declaration 1199 | parameter_type_list T_COMMA parameter_declaration { 1200 $$ = lnklst($1, $3); 1201 } 1202 ; 1203 1204 /* XXX: C99 6.7.5 defines the same name, but it looks completely different. */ 1205 parameter_declaration: 1206 begin_type_declmods end_type { 1207 $$ = declare_argument(abstract_name(), false); 1208 } 1209 | begin_type_declaration_specifiers end_type { 1210 $$ = declare_argument(abstract_name(), false); 1211 } 1212 | begin_type_declmods end_type notype_param_decl { 1213 $$ = declare_argument($3, false); 1214 } 1215 /* 1216 * type_param_decl is needed because of following conflict: 1217 * "typedef int a; f(int (a));" could be parsed as 1218 * "function with argument a of type int", or 1219 * "function with an abstract argument of type function". 1220 * This grammar realizes the second case. 1221 */ 1222 | begin_type_declaration_specifiers end_type type_param_decl { 1223 $$ = declare_argument($3, false); 1224 } 1225 | begin_type_declmods end_type abstract_declarator { 1226 $$ = declare_argument($3, false); 1227 } 1228 | begin_type_declaration_specifiers end_type abstract_declarator { 1229 $$ = declare_argument($3, false); 1230 } 1231 ; 1232 1233 asm_or_symbolrename_opt: /* expect only one */ 1234 /* empty */ { 1235 $$ = NULL; 1236 } 1237 | T_ASM T_LPAREN T_STRING T_RPAREN { 1238 freeyyv(&$3, T_STRING); 1239 $$ = NULL; 1240 } 1241 | T_SYMBOLRENAME T_LPAREN T_NAME T_RPAREN { 1242 $$ = $3; 1243 } 1244 ; 1245 1246 initializer: /* C99 6.7.8 "Initialization" */ 1247 expr %prec T_COMMA { 1248 init_expr($1); 1249 } 1250 | init_lbrace init_rbrace { 1251 /* XXX: Empty braces are not covered by C99 6.7.8. */ 1252 } 1253 | init_lbrace initializer_list comma_opt init_rbrace 1254 | error 1255 ; 1256 1257 initializer_list: /* C99 6.7.8 "Initialization" */ 1258 initializer_list_item 1259 | initializer_list T_COMMA initializer_list_item 1260 ; 1261 1262 initializer_list_item: 1263 designation initializer 1264 | initializer 1265 ; 1266 1267 designation: /* C99 6.7.8 "Initialization" */ 1268 designator_list T_ASSIGN 1269 | identifier T_COLON { 1270 /* GCC style struct or union member name in initializer */ 1271 gnuism(315); 1272 add_designator_member($1); 1273 } 1274 ; 1275 1276 designator_list: /* C99 6.7.8 "Initialization" */ 1277 designator 1278 | designator_list designator 1279 ; 1280 1281 designator: /* C99 6.7.8 "Initialization" */ 1282 T_LBRACK range T_RBRACK { 1283 add_designator_subscript($2); 1284 if (!Sflag) 1285 /* array initializer with des.s is a C9X feature */ 1286 warning(321); 1287 } 1288 | T_POINT identifier { 1289 if (!Sflag) 1290 /* struct or union member name in initializer is ... */ 1291 warning(313); 1292 add_designator_member($2); 1293 } 1294 ; 1295 1296 range: 1297 constant_expr { 1298 $$.lo = to_int_constant($1, true); 1299 $$.hi = $$.lo; 1300 } 1301 | constant_expr T_ELLIPSIS constant_expr { 1302 $$.lo = to_int_constant($1, true); 1303 $$.hi = to_int_constant($3, true); 1304 /* initialization with '[a...b]' is a GCC extension */ 1305 gnuism(340); 1306 } 1307 ; 1308 1309 init_lbrace: 1310 T_LBRACE { 1311 init_lbrace(); 1312 } 1313 ; 1314 1315 init_rbrace: 1316 T_RBRACE { 1317 init_rbrace(); 1318 } 1319 ; 1320 1321 type_name: /* C99 6.7.6 */ 1322 { 1323 begin_declaration_level(ABSTRACT); 1324 } abstract_declaration { 1325 end_declaration_level(); 1326 $$ = $2->s_type; 1327 } 1328 ; 1329 1330 abstract_declaration: 1331 begin_type_noclass_declmods end_type { 1332 $$ = declare_1_abstract(abstract_name()); 1333 } 1334 | begin_type_noclass_declspecs end_type { 1335 $$ = declare_1_abstract(abstract_name()); 1336 } 1337 | begin_type_noclass_declmods end_type abstract_declarator { 1338 $$ = declare_1_abstract($3); 1339 } 1340 | begin_type_noclass_declspecs end_type abstract_declarator { 1341 $$ = declare_1_abstract($3); 1342 } 1343 ; 1344 1345 abstract_declarator: /* C99 6.7.6 */ 1346 pointer { 1347 $$ = add_pointer(abstract_name(), $1); 1348 } 1349 | direct_abstract_declarator 1350 | pointer direct_abstract_declarator { 1351 $$ = add_pointer($2, $1); 1352 } 1353 | T_TYPEOF term { /* GCC extension */ 1354 $$ = mktempsym($2->tn_type); 1355 } 1356 ; 1357 1358 direct_abstract_declarator: /* C99 6.7.6 */ 1359 T_LPAREN abstract_declarator T_RPAREN { 1360 $$ = $2; 1361 } 1362 | T_LBRACK T_RBRACK { 1363 $$ = add_array(abstract_name(), false, 0); 1364 } 1365 | T_LBRACK array_size T_RBRACK { 1366 $$ = add_array(abstract_name(), true, to_int_constant($2, false)); 1367 } 1368 | type_attribute direct_abstract_declarator { 1369 $$ = $2; 1370 } 1371 | direct_abstract_declarator T_LBRACK T_RBRACK { 1372 $$ = add_array($1, false, 0); 1373 } 1374 | direct_abstract_declarator T_LBRACK T_ASTERISK T_RBRACK { /* C99 */ 1375 $$ = add_array($1, false, 0); 1376 } 1377 | direct_abstract_declarator T_LBRACK array_size T_RBRACK { 1378 $$ = add_array($1, true, to_int_constant($3, false)); 1379 } 1380 | abstract_decl_param_list asm_or_symbolrename_opt { 1381 $$ = add_function(symbolrename(abstract_name(), $2), $1); 1382 end_declaration_level(); 1383 block_level--; 1384 } 1385 | direct_abstract_declarator abstract_decl_param_list asm_or_symbolrename_opt { 1386 $$ = add_function(symbolrename($1, $3), $2); 1387 end_declaration_level(); 1388 block_level--; 1389 } 1390 | direct_abstract_declarator type_attribute_list 1391 ; 1392 1393 non_expr_statement: 1394 type_attribute T_SEMI 1395 | labeled_statement 1396 | compound_statement 1397 | selection_statement 1398 | iteration_statement 1399 | jump_statement { 1400 seen_fallthrough = false; 1401 } 1402 | asm_statement 1403 ; 1404 1405 statement: /* C99 6.8 */ 1406 expression_statement 1407 | non_expr_statement 1408 ; 1409 1410 labeled_statement: /* C99 6.8.1 */ 1411 label type_attribute_opt statement 1412 ; 1413 1414 label: 1415 T_NAME T_COLON { 1416 symtyp = FLABEL; 1417 named_label(getsym($1)); 1418 } 1419 | T_CASE constant_expr T_COLON { 1420 case_label($2); 1421 seen_fallthrough = true; 1422 } 1423 | T_CASE constant_expr T_ELLIPSIS constant_expr T_COLON { 1424 /* XXX: We don't fill all cases */ 1425 case_label($2); 1426 seen_fallthrough = true; 1427 } 1428 | T_DEFAULT T_COLON { 1429 default_label(); 1430 seen_fallthrough = true; 1431 } 1432 ; 1433 1434 compound_statement: /* C99 6.8.2 */ 1435 compound_statement_lbrace compound_statement_rbrace 1436 | compound_statement_lbrace block_item_list compound_statement_rbrace 1437 ; 1438 1439 compound_statement_lbrace: 1440 T_LBRACE { 1441 block_level++; 1442 mem_block_level++; 1443 begin_declaration_level(AUTO); 1444 } 1445 ; 1446 1447 compound_statement_rbrace: 1448 T_RBRACE { 1449 end_declaration_level(); 1450 freeblk(); 1451 mem_block_level--; 1452 block_level--; 1453 seen_fallthrough = false; 1454 } 1455 ; 1456 1457 block_item_list: /* C99 6.8.2 */ 1458 block_item 1459 | block_item_list block_item { 1460 if (!Sflag && $1 && !$2) 1461 /* declarations after statements is a C99 feature */ 1462 c99ism(327); 1463 $$ = $1 || $2; 1464 } 1465 ; 1466 1467 block_item: /* C99 6.8.2 */ 1468 declaration { 1469 $$ = false; 1470 restore_warning_flags(); 1471 } 1472 | statement { 1473 $$ = true; 1474 restore_warning_flags(); 1475 } 1476 ; 1477 1478 expression_statement: /* C99 6.8.3 */ 1479 expr T_SEMI { 1480 expr($1, false, false, false, false); 1481 seen_fallthrough = false; 1482 } 1483 | T_SEMI { 1484 seen_fallthrough = false; 1485 } 1486 ; 1487 1488 selection_statement: /* C99 6.8.4 */ 1489 if_without_else { 1490 save_warning_flags(); 1491 if2(); 1492 if3(false); 1493 } 1494 | if_without_else T_ELSE { 1495 save_warning_flags(); 1496 if2(); 1497 } statement { 1498 clear_warning_flags(); 1499 if3(true); 1500 } 1501 | if_without_else T_ELSE error { 1502 clear_warning_flags(); 1503 if3(false); 1504 } 1505 | switch_expr statement { 1506 clear_warning_flags(); 1507 switch2(); 1508 } 1509 | switch_expr error { 1510 clear_warning_flags(); 1511 switch2(); 1512 } 1513 ; 1514 1515 if_without_else: /* see C99 6.8.4 */ 1516 if_expr statement 1517 | if_expr error 1518 ; 1519 1520 if_expr: /* see C99 6.8.4 */ 1521 T_IF T_LPAREN expr T_RPAREN { 1522 if1($3); 1523 clear_warning_flags(); 1524 } 1525 ; 1526 1527 switch_expr: /* see C99 6.8.4 */ 1528 T_SWITCH T_LPAREN expr T_RPAREN { 1529 switch1($3); 1530 clear_warning_flags(); 1531 } 1532 ; 1533 1534 do_statement: /* C99 6.8.5 */ 1535 do statement { 1536 clear_warning_flags(); 1537 } 1538 ; 1539 1540 iteration_statement: /* C99 6.8.5 */ 1541 while_expr statement { 1542 clear_warning_flags(); 1543 while2(); 1544 } 1545 | while_expr error { 1546 clear_warning_flags(); 1547 while2(); 1548 } 1549 | do_statement do_while_expr { 1550 do2($2); 1551 seen_fallthrough = false; 1552 } 1553 | do error { 1554 clear_warning_flags(); 1555 do2(NULL); 1556 } 1557 | for_exprs statement { 1558 clear_warning_flags(); 1559 for2(); 1560 end_declaration_level(); 1561 block_level--; 1562 } 1563 | for_exprs error { 1564 clear_warning_flags(); 1565 for2(); 1566 end_declaration_level(); 1567 block_level--; 1568 } 1569 ; 1570 1571 while_expr: 1572 T_WHILE T_LPAREN expr T_RPAREN { 1573 while1($3); 1574 clear_warning_flags(); 1575 } 1576 ; 1577 1578 do: /* see C99 6.8.5 */ 1579 T_DO { 1580 do1(); 1581 } 1582 ; 1583 1584 do_while_expr: 1585 T_WHILE T_LPAREN expr T_RPAREN T_SEMI { 1586 $$ = $3; 1587 } 1588 ; 1589 1590 for_start: /* see C99 6.8.5 */ 1591 T_FOR T_LPAREN { 1592 begin_declaration_level(AUTO); 1593 block_level++; 1594 } 1595 ; 1596 1597 for_exprs: /* see C99 6.8.5 */ 1598 for_start begin_type_declaration_specifiers end_type notype_init_decls T_SEMI 1599 expr_opt T_SEMI expr_opt T_RPAREN { 1600 /* variable declaration in for loop */ 1601 c99ism(325); 1602 for1(NULL, $6, $8); 1603 clear_warning_flags(); 1604 } 1605 | for_start expr_opt T_SEMI expr_opt T_SEMI expr_opt T_RPAREN { 1606 for1($2, $4, $6); 1607 clear_warning_flags(); 1608 } 1609 ; 1610 1611 jump_statement: /* C99 6.8.6 */ 1612 goto identifier T_SEMI { 1613 do_goto(getsym($2)); 1614 } 1615 | goto error T_SEMI { 1616 symtyp = FVFT; 1617 } 1618 | T_CONTINUE T_SEMI { 1619 do_continue(); 1620 } 1621 | T_BREAK T_SEMI { 1622 do_break(); 1623 } 1624 | T_RETURN T_SEMI { 1625 do_return(NULL); 1626 } 1627 | T_RETURN expr T_SEMI { 1628 do_return($2); 1629 } 1630 ; 1631 1632 goto: 1633 T_GOTO { 1634 symtyp = FLABEL; 1635 } 1636 ; 1637 1638 asm_statement: 1639 T_ASM T_LPAREN read_until_rparen T_SEMI { 1640 setasm(); 1641 } 1642 | T_ASM T_QUAL T_LPAREN read_until_rparen T_SEMI { 1643 setasm(); 1644 } 1645 | T_ASM error 1646 ; 1647 1648 read_until_rparen: 1649 /* empty */ { 1650 ignore_up_to_rparen(); 1651 } 1652 ; 1653 1654 constant_expr_list_opt: 1655 /* empty */ 1656 | constant_expr_list 1657 ; 1658 1659 constant_expr_list: 1660 constant_expr 1661 | constant_expr_list T_COMMA constant_expr 1662 ; 1663 1664 constant_expr: /* C99 6.6 */ 1665 expr %prec T_ASSIGN 1666 ; 1667 1668 expr_opt: 1669 /* empty */ { 1670 $$ = NULL; 1671 } 1672 | expr 1673 ; 1674 1675 expr: /* C99 6.5 */ 1676 expr T_ASTERISK expr { 1677 $$ = build(MULT, $1, $3); 1678 } 1679 | expr T_MULTIPLICATIVE expr { 1680 $$ = build($2, $1, $3); 1681 } 1682 | expr T_ADDITIVE expr { 1683 $$ = build($2, $1, $3); 1684 } 1685 | expr T_SHIFT expr { 1686 $$ = build($2, $1, $3); 1687 } 1688 | expr T_RELATIONAL expr { 1689 $$ = build($2, $1, $3); 1690 } 1691 | expr T_EQUALITY expr { 1692 $$ = build($2, $1, $3); 1693 } 1694 | expr T_AMPER expr { 1695 $$ = build(BITAND, $1, $3); 1696 } 1697 | expr T_BITXOR expr { 1698 $$ = build(BITXOR, $1, $3); 1699 } 1700 | expr T_BITOR expr { 1701 $$ = build(BITOR, $1, $3); 1702 } 1703 | expr T_LOGAND expr { 1704 $$ = build(LOGAND, $1, $3); 1705 } 1706 | expr T_LOGOR expr { 1707 $$ = build(LOGOR, $1, $3); 1708 } 1709 | expr T_QUEST expr T_COLON expr { 1710 $$ = build(QUEST, $1, build(COLON, $3, $5)); 1711 } 1712 | expr T_ASSIGN expr { 1713 $$ = build(ASSIGN, $1, $3); 1714 } 1715 | expr T_OPASSIGN expr { 1716 $$ = build($2, $1, $3); 1717 } 1718 | expr T_COMMA expr { 1719 $$ = build(COMMA, $1, $3); 1720 } 1721 | term 1722 | generic_selection 1723 ; 1724 1725 assignment_expression: /* C99 6.5.16 */ 1726 expr %prec T_ASSIGN 1727 ; 1728 1729 primary_expression: /* C99 6.5.1 */ 1730 T_NAME { 1731 /* XXX really necessary? */ 1732 if (yychar < 0) 1733 yychar = yylex(); 1734 $$ = new_name_node(getsym($1), yychar); 1735 } 1736 | T_CON { 1737 $$ = expr_new_constant(gettyp($1->v_tspec), $1); 1738 } 1739 | string { 1740 $$ = new_string_node($1); 1741 } 1742 | T_LPAREN expr T_RPAREN { 1743 if ($2 != NULL) 1744 $2->tn_parenthesized = true; 1745 $$ = $2; 1746 } 1747 ; 1748 1749 postfix_expression: /* C99 6.5.2 */ 1750 primary_expression 1751 | postfix_expression T_LBRACK expr T_RBRACK { 1752 $$ = build(INDIR, build(PLUS, $1, $3), NULL); 1753 } 1754 | postfix_expression T_LPAREN T_RPAREN { 1755 $$ = new_function_call_node($1, NULL); 1756 } 1757 | postfix_expression T_LPAREN argument_expression_list T_RPAREN { 1758 $$ = new_function_call_node($1, $3); 1759 } 1760 | postfix_expression point_or_arrow T_NAME { 1761 if ($1 != NULL) { 1762 sym_t *msym; 1763 /* 1764 * XXX struct_or_union_member should be integrated 1765 * in build() 1766 */ 1767 if ($2 == ARROW) { 1768 /* 1769 * must do this before struct_or_union_member 1770 * is called 1771 */ 1772 $1 = cconv($1); 1773 } 1774 msym = struct_or_union_member($1, $2, getsym($3)); 1775 $$ = build($2, $1, new_name_node(msym, 0)); 1776 } else { 1777 $$ = NULL; 1778 } 1779 } 1780 | postfix_expression T_INCDEC { 1781 $$ = build($2 == INC ? INCAFT : DECAFT, $1, NULL); 1782 } 1783 | T_LPAREN type_name T_RPAREN { /* C99 6.5.2.5 "Compound literals" */ 1784 sym_t *tmp = mktempsym($2); 1785 begin_initialization(tmp); 1786 cgram_declare(tmp, true, NULL); 1787 } init_lbrace initializer_list comma_opt init_rbrace { 1788 if (!Sflag) 1789 /* compound literals are a C9X/GCC extension */ 1790 gnuism(319); 1791 $$ = new_name_node(*current_initsym(), 0); 1792 end_initialization(); 1793 } 1794 | T_LPAREN compound_statement_lbrace gcc_statement_expr_list { 1795 block_level--; 1796 mem_block_level--; 1797 begin_initialization(mktempsym(dup_type($3->tn_type))); 1798 mem_block_level++; 1799 block_level++; 1800 /* ({ }) is a GCC extension */ 1801 gnuism(320); 1802 } compound_statement_rbrace T_RPAREN { 1803 $$ = new_name_node(*current_initsym(), 0); 1804 end_initialization(); 1805 } 1806 ; 1807 1808 unary_expression: /* C99 6.5.3 */ 1809 postfix_expression 1810 | T_INCDEC unary_expression { 1811 $$ = build($1 == INC ? INCBEF : DECBEF, $2, NULL); 1812 } 1813 | T_AMPER term { 1814 $$ = build(ADDR, $2, NULL); 1815 } 1816 | T_ASTERISK term { 1817 $$ = build(INDIR, $2, NULL); 1818 } 1819 | T_ADDITIVE term { 1820 if (tflag && $1 == PLUS) { 1821 /* unary + is illegal in traditional C */ 1822 warning(100); 1823 } 1824 $$ = build($1 == PLUS ? UPLUS : UMINUS, $2, NULL); 1825 } 1826 | T_COMPLEMENT term { 1827 $$ = build(COMPL, $2, NULL); 1828 } 1829 | T_LOGNOT term { 1830 $$ = build(NOT, $2, NULL); 1831 } 1832 | T_SIZEOF unary_expression { 1833 $$ = $2 == NULL ? NULL : build_sizeof($2->tn_type); 1834 if ($$ != NULL) 1835 check_expr_misc($2, false, false, false, false, false, true); 1836 } 1837 | T_SIZEOF T_LPAREN type_name T_RPAREN { 1838 $$ = build_sizeof($3); 1839 } 1840 ; 1841 1842 term: /* see C99 6.5.1 */ 1843 unary_expression 1844 | T_REAL term { 1845 $$ = build(REAL, $2, NULL); 1846 } 1847 | T_IMAG term { 1848 $$ = build(IMAG, $2, NULL); 1849 } 1850 | T_EXTENSION term { 1851 $$ = $2; 1852 } 1853 | T_REAL T_LPAREN term T_RPAREN { 1854 $$ = build(REAL, $3, NULL); 1855 } 1856 | T_IMAG T_LPAREN term T_RPAREN { 1857 $$ = build(IMAG, $3, NULL); 1858 } 1859 | T_BUILTIN_OFFSETOF T_LPAREN type_name T_COMMA identifier T_RPAREN { 1860 symtyp = FMEMBER; 1861 $$ = build_offsetof($3, getsym($5)); 1862 } 1863 | T_ALIGNOF T_LPAREN type_name T_RPAREN { 1864 $$ = build_alignof($3); 1865 } 1866 | T_LPAREN type_name T_RPAREN term { 1867 $$ = cast($4, $2); 1868 } 1869 ; 1870 1871 generic_selection: /* C11 6.5.1.1 */ 1872 T_GENERIC T_LPAREN assignment_expression T_COMMA 1873 generic_assoc_list T_RPAREN { 1874 /* generic selection requires C11 or later */ 1875 c11ism(345); 1876 $$ = build_generic_selection($3, $5); 1877 } 1878 ; 1879 1880 generic_assoc_list: /* C11 6.5.1.1 */ 1881 generic_association 1882 | generic_assoc_list T_COMMA generic_association { 1883 $3->ga_prev = $1; 1884 $$ = $3; 1885 } 1886 ; 1887 1888 generic_association: /* C11 6.5.1.1 */ 1889 type_name T_COLON assignment_expression { 1890 $$ = getblk(sizeof(*$$)); 1891 $$->ga_arg = $1; 1892 $$->ga_result = $3; 1893 } 1894 | T_DEFAULT T_COLON assignment_expression { 1895 $$ = getblk(sizeof(*$$)); 1896 $$->ga_arg = NULL; 1897 $$->ga_result = $3; 1898 } 1899 ; 1900 1901 argument_expression_list: /* C99 6.5.2 */ 1902 expr %prec T_COMMA { 1903 $$ = new_function_argument_node(NULL, $1); 1904 } 1905 | argument_expression_list T_COMMA expr { 1906 $$ = new_function_argument_node($1, $3); 1907 } 1908 ; 1909 1910 /* 1911 * The inner part of a GCC statement-expression of the form ({ ... }). 1912 * 1913 * https://gcc.gnu.org/onlinedocs/gcc/Statement-Exprs.html 1914 */ 1915 gcc_statement_expr_list: 1916 gcc_statement_expr_item 1917 | gcc_statement_expr_list gcc_statement_expr_item { 1918 $$ = $2; 1919 } 1920 ; 1921 1922 gcc_statement_expr_item: 1923 declaration { 1924 clear_warning_flags(); 1925 $$ = NULL; 1926 } 1927 | non_expr_statement { 1928 $$ = expr_zalloc_tnode(); 1929 $$->tn_type = gettyp(VOID); 1930 } 1931 | expr T_SEMI { 1932 if ($1 == NULL) { /* in case of syntax errors */ 1933 $$ = expr_zalloc_tnode(); 1934 $$->tn_type = gettyp(VOID); 1935 } else { 1936 /* XXX: do that only on the last name */ 1937 if ($1->tn_op == NAME) 1938 $1->tn_sym->s_used = true; 1939 $$ = $1; 1940 expr($1, false, false, false, false); 1941 seen_fallthrough = false; 1942 } 1943 } 1944 ; 1945 1946 string: 1947 T_STRING 1948 | T_STRING string2 { 1949 $$ = cat_strings($1, $2); 1950 } 1951 ; 1952 1953 string2: 1954 T_STRING { 1955 if (tflag) { 1956 /* concatenated strings are illegal in traditional C */ 1957 warning(219); 1958 } 1959 $$ = $1; 1960 } 1961 | string2 T_STRING { 1962 $$ = cat_strings($1, $2); 1963 } 1964 ; 1965 1966 point_or_arrow: 1967 T_POINT { 1968 symtyp = FMEMBER; 1969 $$ = POINT; 1970 } 1971 | T_ARROW { 1972 symtyp = FMEMBER; 1973 $$ = ARROW; 1974 } 1975 ; 1976 1977 identifier_sym: 1978 identifier { 1979 $$ = getsym($1); 1980 } 1981 ; 1982 1983 identifier: /* C99 6.4.2.1 */ 1984 T_NAME { 1985 $$ = $1; 1986 cgram_debug("name '%s'", $$->sb_name); 1987 } 1988 | T_TYPENAME { 1989 $$ = $1; 1990 cgram_debug("typename '%s'", $$->sb_name); 1991 } 1992 ; 1993 1994 comma_opt: 1995 /* empty */ 1996 | T_COMMA 1997 ; 1998 1999 gcc_attribute_spec_list: 2000 gcc_attribute_spec 2001 | gcc_attribute_spec_list T_COMMA gcc_attribute_spec 2002 ; 2003 2004 gcc_attribute_spec: 2005 /* empty */ 2006 | T_AT_ALWAYS_INLINE 2007 | T_AT_ALIAS T_LPAREN string T_RPAREN 2008 | T_AT_ALIGNED T_LPAREN constant_expr T_RPAREN 2009 | T_AT_ALIGNED 2010 | T_AT_ALLOC_SIZE T_LPAREN constant_expr T_COMMA constant_expr T_RPAREN 2011 | T_AT_ALLOC_SIZE T_LPAREN constant_expr T_RPAREN 2012 | T_AT_BOUNDED T_LPAREN gcc_attribute_bounded 2013 T_COMMA constant_expr T_COMMA constant_expr T_RPAREN 2014 | T_AT_COLD 2015 | T_AT_COMMON 2016 | T_AT_CONSTRUCTOR T_LPAREN constant_expr T_RPAREN 2017 | T_AT_CONSTRUCTOR 2018 | T_AT_DEPRECATED T_LPAREN string T_RPAREN 2019 | T_AT_DEPRECATED 2020 | T_AT_DESTRUCTOR T_LPAREN constant_expr T_RPAREN 2021 | T_AT_DESTRUCTOR 2022 | T_AT_FALLTHROUGH { 2023 fallthru(1); 2024 } 2025 | T_AT_FORMAT T_LPAREN gcc_attribute_format T_COMMA 2026 constant_expr T_COMMA constant_expr T_RPAREN 2027 | T_AT_FORMAT_ARG T_LPAREN constant_expr T_RPAREN 2028 | T_AT_GNU_INLINE 2029 | T_AT_MALLOC 2030 | T_AT_MAY_ALIAS 2031 | T_AT_MODE T_LPAREN T_NAME T_RPAREN 2032 | T_AT_NOINLINE 2033 | T_AT_NONNULL T_LPAREN constant_expr_list_opt T_RPAREN 2034 | T_AT_NONNULL 2035 | T_AT_NONSTRING 2036 | T_AT_NORETURN 2037 | T_AT_NOTHROW 2038 | T_AT_NO_INSTRUMENT_FUNCTION 2039 | T_AT_OPTIMIZE T_LPAREN string T_RPAREN 2040 | T_AT_PACKED { 2041 addpacked(); 2042 } 2043 | T_AT_PCS T_LPAREN string T_RPAREN 2044 | T_AT_PURE 2045 | T_AT_RETURNS_TWICE 2046 | T_AT_SECTION T_LPAREN string T_RPAREN 2047 | T_AT_SENTINEL T_LPAREN constant_expr T_RPAREN 2048 | T_AT_SENTINEL 2049 | T_AT_TLS_MODEL T_LPAREN string T_RPAREN 2050 | T_AT_TUNION 2051 | T_AT_UNUSED { 2052 add_attr_used(); 2053 } 2054 | T_AT_USED { 2055 add_attr_used(); 2056 } 2057 | T_AT_VISIBILITY T_LPAREN constant_expr T_RPAREN 2058 | T_AT_WARN_UNUSED_RESULT 2059 | T_AT_WEAK 2060 | T_QUAL { 2061 if ($1 != CONST) 2062 yyerror("Bad attribute"); 2063 } 2064 ; 2065 2066 gcc_attribute_bounded: 2067 T_AT_MINBYTES 2068 | T_AT_STRING 2069 | T_AT_BUFFER 2070 ; 2071 2072 gcc_attribute_format: 2073 T_AT_FORMAT_GNU_PRINTF 2074 | T_AT_FORMAT_PRINTF 2075 | T_AT_FORMAT_SCANF 2076 | T_AT_FORMAT_STRFMON 2077 | T_AT_FORMAT_STRFTIME 2078 | T_AT_FORMAT_SYSLOG 2079 ; 2080 2081 %% 2082 2083 /* ARGSUSED */ 2084 int 2085 yyerror(const char *msg) 2086 { 2087 /* syntax error '%s' */ 2088 error(249, yytext); 2089 if (++sytxerr >= 5) 2090 norecover(); 2091 return 0; 2092 } 2093 2094 static void 2095 cgram_declare(sym_t *decl, bool initflg, sbuf_t *renaming) 2096 { 2097 declare(decl, initflg, renaming); 2098 if (renaming != NULL) 2099 freeyyv(&renaming, T_NAME); 2100 } 2101 2102 /* 2103 * Discard all input tokens up to and including the next 2104 * unmatched right paren 2105 */ 2106 static void 2107 ignore_up_to_rparen(void) 2108 { 2109 int level; 2110 2111 if (yychar < 0) 2112 yychar = yylex(); 2113 freeyyv(&yylval, yychar); 2114 2115 level = 1; 2116 while (yychar != T_RPAREN || --level > 0) { 2117 if (yychar == T_LPAREN) { 2118 level++; 2119 } else if (yychar <= 0) { 2120 break; 2121 } 2122 freeyyv(&yylval, yychar = yylex()); 2123 } 2124 2125 yyclearin; 2126 } 2127 2128 static sym_t * 2129 symbolrename(sym_t *s, sbuf_t *sb) 2130 { 2131 if (sb != NULL) 2132 s->s_rename = sb->sb_name; 2133 return s; 2134 } 2135
Indexes created Fri Oct 03 17:10:05 GMT 2025