cgram.y revision 1.267
1 %{ 2 /* $NetBSD: cgram.y,v 1.267 2021/07/08 03:19:17 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 1.267 2021/07/08 03:19:17 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 %expect 162 127 128 %union { 129 val_t *y_val; 130 sbuf_t *y_sb; 131 sym_t *y_sym; 132 op_t y_op; 133 scl_t y_scl; 134 tspec_t y_tspec; 135 tqual_t y_tqual; 136 type_t *y_type; 137 tnode_t *y_tnode; 138 range_t y_range; 139 strg_t *y_string; 140 qual_ptr *y_qual_ptr; 141 bool y_seen_statement; 142 struct generic_association *y_generic; 143 }; 144 145 %token T_LBRACE T_RBRACE T_LBRACK T_RBRACK T_LPAREN T_RPAREN 146 %token T_POINT T_ARROW 147 %token <y_op> T_UNARY 148 %token <y_op> T_INCDEC 149 %token T_SIZEOF 150 %token T_BUILTIN_OFFSETOF 151 %token T_TYPEOF 152 %token T_EXTENSION 153 %token T_ALIGNAS 154 %token T_ALIGNOF 155 %token T_ASTERISK 156 %token <y_op> T_MULTIPLICATIVE 157 %token <y_op> T_ADDITIVE 158 %token <y_op> T_SHIFT 159 %token <y_op> T_RELATIONAL 160 %token <y_op> T_EQUALITY 161 %token T_AMPER 162 %token T_BITXOR 163 %token T_BITOR 164 %token T_LOGAND 165 %token T_LOGOR 166 %token T_QUEST 167 %token T_COLON 168 %token T_ASSIGN 169 %token <y_op> T_OPASSIGN 170 %token T_COMMA 171 %token T_SEMI 172 %token T_ELLIPSIS 173 %token T_REAL 174 %token T_IMAG 175 %token T_GENERIC 176 %token T_NORETURN 177 178 /* storage classes (extern, static, auto, register and typedef) */ 179 %token <y_scl> T_SCLASS 180 181 /* 182 * predefined type keywords (char, int, short, long, unsigned, signed, 183 * float, double, void); see T_TYPENAME 184 */ 185 %token <y_tspec> T_TYPE 186 187 /* qualifiers (const, volatile, restrict, _Thread_local) */ 188 %token <y_tqual> T_QUAL 189 190 /* struct or union */ 191 %token <y_tspec> T_STRUCT_OR_UNION 192 193 /* remaining keywords */ 194 %token T_ASM 195 %token T_BREAK 196 %token T_CASE 197 %token T_CONTINUE 198 %token T_DEFAULT 199 %token T_DO 200 %token T_ELSE 201 %token T_ENUM 202 %token T_FOR 203 %token T_GOTO 204 %token T_IF 205 %token T_PACKED 206 %token T_RETURN 207 %token T_SWITCH 208 %token T_SYMBOLRENAME 209 %token T_WHILE 210 211 %token T_ATTRIBUTE 212 %token T_AT_ALIAS 213 %token T_AT_ALIGNED 214 %token T_AT_ALLOC_SIZE 215 %token T_AT_ALWAYS_INLINE 216 %token T_AT_BOUNDED 217 %token T_AT_BUFFER 218 %token T_AT_COLD 219 %token T_AT_COMMON 220 %token T_AT_CONSTRUCTOR 221 %token T_AT_DEPRECATED 222 %token T_AT_DESTRUCTOR 223 %token T_AT_FALLTHROUGH 224 %token T_AT_FORMAT 225 %token T_AT_FORMAT_ARG 226 %token T_AT_FORMAT_GNU_PRINTF 227 %token T_AT_FORMAT_PRINTF 228 %token T_AT_FORMAT_SCANF 229 %token T_AT_FORMAT_STRFMON 230 %token T_AT_FORMAT_STRFTIME 231 %token T_AT_FORMAT_SYSLOG 232 %token T_AT_GNU_INLINE 233 %token T_AT_MALLOC 234 %token T_AT_MAY_ALIAS 235 %token T_AT_MINBYTES 236 %token T_AT_MODE 237 %token T_AT_NOINLINE 238 %token T_AT_NONNULL 239 %token T_AT_NONSTRING 240 %token T_AT_NORETURN 241 %token T_AT_NOTHROW 242 %token T_AT_NO_INSTRUMENT_FUNCTION 243 %token T_AT_OPTIMIZE 244 %token T_AT_PACKED 245 %token T_AT_PCS 246 %token T_AT_PURE 247 %token T_AT_RETURNS_TWICE 248 %token T_AT_SECTION 249 %token T_AT_SENTINEL 250 %token T_AT_STRING 251 %token T_AT_TLS_MODEL 252 %token T_AT_TUNION 253 %token T_AT_UNUSED 254 %token T_AT_USED 255 %token T_AT_VISIBILITY 256 %token T_AT_WARN_UNUSED_RESULT 257 %token T_AT_WEAK 258 259 %left T_COMMA 260 %right T_ASSIGN T_OPASSIGN 261 %right T_QUEST T_COLON 262 %left T_LOGOR 263 %left T_LOGAND 264 %left T_BITOR 265 %left T_BITXOR 266 %left T_AMPER 267 %left T_EQUALITY 268 %left T_RELATIONAL 269 %left T_SHIFT 270 %left T_ADDITIVE 271 %left T_ASTERISK T_MULTIPLICATIVE 272 %right T_UNARY T_INCDEC T_SIZEOF T_REAL T_IMAG 273 %left T_LPAREN T_LBRACK T_POINT T_ARROW 274 275 %token <y_sb> T_NAME 276 %token <y_sb> T_TYPENAME 277 %token <y_val> T_CON 278 %token <y_string> T_STRING 279 280 %type <y_sym> func_decl 281 %type <y_sym> notype_decl 282 %type <y_sym> type_decl 283 %type <y_type> typespec 284 %type <y_type> clrtyp_typespec 285 %type <y_type> notype_typespec 286 %type <y_type> struct_spec 287 %type <y_type> enum_spec 288 %type <y_sym> struct_tag 289 %type <y_sym> enum_tag 290 %type <y_tspec> struct 291 %type <y_sym> struct_declaration 292 %type <y_sb> identifier 293 %type <y_sym> member_declaration_list_with_rbrace 294 %type <y_sym> member_declaration_list 295 %type <y_sym> member_declaration 296 %type <y_sym> notype_member_decls 297 %type <y_sym> type_member_decls 298 %type <y_sym> notype_member_decl 299 %type <y_sym> type_member_decl 300 %type <y_tnode> constant_expr 301 %type <y_tnode> array_size 302 %type <y_sym> enum_declaration 303 %type <y_sym> enumerator_list 304 %type <y_sym> enumerator 305 %type <y_sym> enumeration_constant 306 %type <y_sym> notype_direct_decl 307 %type <y_sym> type_direct_decl 308 %type <y_qual_ptr> pointer 309 %type <y_qual_ptr> asterisk 310 %type <y_sym> type_param_decl 311 %type <y_sym> param_list 312 %type <y_sym> abstract_decl_param_list 313 %type <y_sym> direct_param_decl 314 %type <y_sym> notype_param_decl 315 %type <y_sym> direct_notype_param_decl 316 %type <y_qual_ptr> type_qualifier_list_opt 317 %type <y_qual_ptr> type_qualifier_list 318 %type <y_qual_ptr> type_qualifier 319 %type <y_sym> identifier_list 320 %type <y_sym> abstract_declarator 321 %type <y_sym> direct_abstract_declarator 322 %type <y_sym> vararg_parameter_type_list 323 %type <y_sym> parameter_type_list 324 %type <y_sym> parameter_declaration 325 %type <y_tnode> expr 326 %type <y_tnode> assignment_expression 327 %type <y_tnode> gcc_statement_expr_list 328 %type <y_tnode> gcc_statement_expr_item 329 %type <y_tnode> term 330 %type <y_tnode> generic_selection 331 %type <y_tnode> func_arg_list 332 %type <y_op> point_or_arrow 333 %type <y_type> type_name 334 %type <y_sym> abstract_declaration 335 %type <y_tnode> do_while_expr 336 %type <y_tnode> expr_opt 337 %type <y_string> string 338 %type <y_string> string2 339 %type <y_sb> asm_or_symbolrename_opt 340 %type <y_range> range 341 %type <y_seen_statement> block_item_list 342 %type <y_seen_statement> block_item 343 %type <y_generic> generic_assoc_list 344 %type <y_generic> generic_association 345 346 347 %% 348 349 program: 350 /* empty */ { 351 if (sflag) { 352 /* empty translation unit */ 353 error(272); 354 } else if (!tflag) { 355 /* empty translation unit */ 356 warning(272); 357 } 358 } 359 | translation_unit 360 ; 361 362 translation_unit: /* C99 6.9 */ 363 external_declaration 364 | translation_unit external_declaration 365 ; 366 367 external_declaration: /* C99 6.9 */ 368 asm_statement 369 | function_definition { 370 global_clean_up_decl(false); 371 clear_warning_flags(); 372 } 373 | top_level_declaration { 374 global_clean_up_decl(false); 375 clear_warning_flags(); 376 } 377 ; 378 379 /* 380 * On the top level, lint allows several forms of declarations that it doesn't 381 * allow in functions. For example, a single ';' is an empty declaration and 382 * is supported by some compilers, but in a function it would be an empty 383 * statement, not a declaration. This makes a difference in C90 mode, where 384 * a statement must not be followed by a declaration. 385 * 386 * See 'declaration' for all other declarations. 387 */ 388 top_level_declaration: /* C99 6.9 calls this 'declaration' */ 389 T_SEMI { 390 if (sflag) { 391 /* empty declaration */ 392 error(0); 393 } else if (!tflag) { 394 /* empty declaration */ 395 warning(0); 396 } 397 } 398 | clrtyp deftyp notype_init_decls T_SEMI { 399 if (sflag) { 400 /* old style declaration; add 'int' */ 401 error(1); 402 } else if (!tflag) { 403 /* old style declaration; add 'int' */ 404 warning(1); 405 } 406 } 407 | declmods deftyp T_SEMI { 408 if (dcs->d_scl == TYPEDEF) { 409 /* typedef declares no type name */ 410 warning(72); 411 } else { 412 /* empty declaration */ 413 warning(2); 414 } 415 } 416 | declmods deftyp notype_init_decls T_SEMI 417 | declaration_specifiers deftyp T_SEMI { 418 if (dcs->d_scl == TYPEDEF) { 419 /* typedef declares no type name */ 420 warning(72); 421 } else if (!dcs->d_nonempty_decl) { 422 /* empty declaration */ 423 warning(2); 424 } 425 } 426 | declaration_specifiers deftyp type_init_decls T_SEMI 427 | error T_SEMI { 428 global_clean_up(); 429 } 430 | error T_RBRACE { 431 global_clean_up(); 432 } 433 ; 434 435 function_definition: /* C99 6.9.1 */ 436 func_decl { 437 if ($1->s_type->t_tspec != FUNC) { 438 /* syntax error '%s' */ 439 error(249, yytext); 440 YYERROR; 441 } 442 if ($1->s_type->t_typedef) { 443 /* ()-less function definition */ 444 error(64); 445 YYERROR; 446 } 447 funcdef($1); 448 block_level++; 449 begin_declaration_level(ARG); 450 if (lwarn == LWARN_NONE) 451 $1->s_used = true; 452 } arg_declaration_list_opt { 453 end_declaration_level(); 454 block_level--; 455 check_func_lint_directives(); 456 check_func_old_style_arguments(); 457 begin_control_statement(CS_FUNCTION_BODY); 458 } compound_statement { 459 funcend(); 460 end_control_statement(CS_FUNCTION_BODY); 461 } 462 ; 463 464 func_decl: 465 clrtyp deftyp notype_decl { 466 $$ = $3; 467 } 468 | declmods deftyp notype_decl { 469 $$ = $3; 470 } 471 | declaration_specifiers deftyp type_decl { 472 $$ = $3; 473 } 474 ; 475 476 arg_declaration_list_opt: /* C99 6.9.1p13 example 1 */ 477 /* empty */ 478 | arg_declaration_list 479 ; 480 481 arg_declaration_list: /* C99 6.9.1p13 example 1 */ 482 arg_declaration 483 | arg_declaration_list arg_declaration 484 /* XXX or better "arg_declaration error" ? */ 485 | error 486 ; 487 488 /* 489 * "arg_declaration" is separated from "declaration" because it 490 * needs other error handling. 491 */ 492 arg_declaration: 493 declmods deftyp T_SEMI { 494 /* empty declaration */ 495 warning(2); 496 } 497 | declmods deftyp notype_init_decls T_SEMI 498 | declaration_specifiers deftyp T_SEMI { 499 if (!dcs->d_nonempty_decl) { 500 /* empty declaration */ 501 warning(2); 502 } else { 503 /* '%s' declared in argument declaration list */ 504 warning(3, type_name(dcs->d_type)); 505 } 506 } 507 | declaration_specifiers deftyp type_init_decls T_SEMI { 508 if (dcs->d_nonempty_decl) { 509 /* '%s' declared in argument declaration list */ 510 warning(3, type_name(dcs->d_type)); 511 } 512 } 513 | declmods error 514 | declaration_specifiers error 515 ; 516 517 declaration: /* C99 6.7 */ 518 declmods deftyp T_SEMI { 519 if (dcs->d_scl == TYPEDEF) { 520 /* typedef declares no type name */ 521 warning(72); 522 } else { 523 /* empty declaration */ 524 warning(2); 525 } 526 } 527 | declmods deftyp notype_init_decls T_SEMI 528 | declaration_specifiers deftyp T_SEMI { 529 if (dcs->d_scl == TYPEDEF) { 530 /* typedef declares no type name */ 531 warning(72); 532 } else if (!dcs->d_nonempty_decl) { 533 /* empty declaration */ 534 warning(2); 535 } 536 } 537 | declaration_specifiers deftyp type_init_decls T_SEMI 538 | error T_SEMI 539 ; 540 541 clrtyp: 542 /* empty */ { 543 clrtyp(); 544 } 545 ; 546 547 deftyp: 548 /* empty */ { 549 deftyp(); 550 } 551 ; 552 553 declaration_specifiers: /* C99 6.7 */ 554 clrtyp_typespec { 555 add_type($1); 556 } 557 | declmods typespec { 558 add_type($2); 559 } 560 | type_attribute declaration_specifiers 561 | declaration_specifiers declmod 562 | declaration_specifiers notype_typespec { 563 add_type($2); 564 } 565 ; 566 567 declmods: 568 clrtyp T_QUAL { 569 add_qualifier($2); 570 } 571 | clrtyp T_SCLASS { 572 add_storage_class($2); 573 } 574 | declmods declmod 575 ; 576 577 declmod: 578 T_QUAL { 579 add_qualifier($1); 580 } 581 | T_SCLASS { 582 add_storage_class($1); 583 } 584 | type_attribute 585 ; 586 587 clrtyp_typespec: 588 clrtyp notype_typespec { 589 $$ = $2; 590 } 591 | T_TYPENAME clrtyp { 592 $$ = getsym($1)->s_type; 593 } 594 ; 595 596 typespec: 597 notype_typespec 598 | T_TYPENAME { 599 $$ = getsym($1)->s_type; 600 } 601 ; 602 603 notype_typespec: 604 T_TYPE { 605 $$ = gettyp($1); 606 } 607 | T_TYPEOF term { 608 $$ = $2->tn_type; 609 } 610 | struct_spec { 611 end_declaration_level(); 612 $$ = $1; 613 } 614 | enum_spec { 615 end_declaration_level(); 616 $$ = $1; 617 } 618 ; 619 620 struct_spec: 621 struct struct_tag { 622 /* 623 * STDC requires that "struct a;" always introduces 624 * a new tag if "a" is not declared at current level 625 * 626 * yychar is valid because otherwise the parser would not 627 * have been able to decide if it must shift or reduce 628 */ 629 $$ = mktag($2, $1, false, yychar == T_SEMI); 630 } 631 | struct struct_tag { 632 dcs->d_tagtyp = mktag($2, $1, true, false); 633 } struct_declaration { 634 $$ = complete_tag_struct_or_union(dcs->d_tagtyp, $4); 635 } 636 | struct { 637 dcs->d_tagtyp = mktag(NULL, $1, true, false); 638 } struct_declaration { 639 $$ = complete_tag_struct_or_union(dcs->d_tagtyp, $3); 640 } 641 | struct error { 642 symtyp = FVFT; 643 $$ = gettyp(INT); 644 } 645 ; 646 647 struct: 648 struct type_attribute 649 | T_STRUCT_OR_UNION { 650 symtyp = FTAG; 651 begin_declaration_level($1 == STRUCT ? MOS : MOU); 652 dcs->d_offset = 0; 653 dcs->d_sou_align_in_bits = CHAR_SIZE; 654 $$ = $1; 655 } 656 ; 657 658 struct_tag: 659 identifier { 660 $$ = getsym($1); 661 } 662 ; 663 664 struct_declaration: 665 struct_decl_lbrace member_declaration_list_with_rbrace { 666 $$ = $2; 667 } 668 ; 669 670 struct_decl_lbrace: 671 T_LBRACE { 672 symtyp = FVFT; 673 } 674 ; 675 676 member_declaration_list_with_rbrace: 677 member_declaration_list T_SEMI T_RBRACE 678 | member_declaration_list T_RBRACE { 679 if (sflag) { 680 /* syntax req. ';' after last struct/union member */ 681 error(66); 682 } else { 683 /* syntax req. ';' after last struct/union member */ 684 warning(66); 685 } 686 $$ = $1; 687 } 688 | T_RBRACE { 689 $$ = NULL; 690 } 691 ; 692 693 type_attribute_opt: 694 /* empty */ 695 | type_attribute 696 ; 697 698 member_declaration_list: 699 member_declaration 700 | member_declaration_list T_SEMI member_declaration { 701 $$ = lnklst($1, $3); 702 } 703 ; 704 705 member_declaration: 706 noclass_declmods deftyp { 707 /* too late, i know, but getsym() compensates it */ 708 symtyp = FMEMBER; 709 } notype_member_decls type_attribute_opt { 710 symtyp = FVFT; 711 $$ = $4; 712 } 713 | noclass_declspecs deftyp { 714 symtyp = FMEMBER; 715 } type_member_decls type_attribute_opt { 716 symtyp = FVFT; 717 $$ = $4; 718 } 719 | noclass_declmods deftyp type_attribute_opt { 720 symtyp = FVFT; 721 /* struct or union member must be named */ 722 if (!Sflag) 723 /* anonymous struct/union members is a C9X feature */ 724 warning(49); 725 /* add all the members of the anonymous struct/union */ 726 lint_assert(is_struct_or_union(dcs->d_type->t_tspec)); 727 $$ = dcs->d_type->t_str->sou_first_member; 728 anonymize($$); 729 } 730 | noclass_declspecs deftyp type_attribute_opt { 731 symtyp = FVFT; 732 /* struct or union member must be named */ 733 if (!Sflag) 734 /* anonymous struct/union members is a C9X feature */ 735 warning(49); 736 if (is_struct_or_union(dcs->d_type->t_tspec)) { 737 $$ = dcs->d_type->t_str->sou_first_member; 738 /* add all the members of the anonymous struct/union */ 739 anonymize($$); 740 } else { 741 /* syntax error '%s' */ 742 error(249, "unnamed member"); 743 $$ = NULL; 744 } 745 } 746 | error { 747 symtyp = FVFT; 748 $$ = NULL; 749 } 750 ; 751 752 /* 753 * XXX: shift/reduce conflict, caused by: 754 * type_attribute noclass_declspecs 755 * noclass_declspecs type_attribute 756 */ 757 noclass_declspecs: 758 clrtyp_typespec { 759 add_type($1); 760 } 761 | type_attribute noclass_declspecs 762 | noclass_declmods typespec { 763 add_type($2); 764 } 765 | noclass_declspecs T_QUAL { 766 add_qualifier($2); 767 } 768 | noclass_declspecs notype_typespec { 769 add_type($2); 770 } 771 | noclass_declspecs type_attribute 772 ; 773 774 noclass_declmods: 775 clrtyp T_QUAL { 776 add_qualifier($2); 777 } 778 | noclass_declmods T_QUAL { 779 add_qualifier($2); 780 } 781 ; 782 783 notype_member_decls: 784 notype_member_decl { 785 $$ = declarator_1_struct_union($1); 786 } 787 | notype_member_decls { 788 symtyp = FMEMBER; 789 } T_COMMA type_member_decl { 790 $$ = lnklst($1, declarator_1_struct_union($4)); 791 } 792 ; 793 794 type_member_decls: 795 type_member_decl { 796 $$ = declarator_1_struct_union($1); 797 } 798 | type_member_decls { 799 symtyp = FMEMBER; 800 } T_COMMA type_member_decl { 801 $$ = lnklst($1, declarator_1_struct_union($4)); 802 } 803 ; 804 805 notype_member_decl: 806 notype_decl 807 | notype_decl T_COLON constant_expr { /* C99 6.7.2.1 */ 808 $$ = bitfield($1, to_int_constant($3, true)); 809 } 810 | { 811 symtyp = FVFT; 812 } T_COLON constant_expr { /* C99 6.7.2.1 */ 813 $$ = bitfield(NULL, to_int_constant($3, true)); 814 } 815 ; 816 817 type_member_decl: 818 type_decl 819 | type_decl T_COLON constant_expr { 820 $$ = bitfield($1, to_int_constant($3, true)); 821 } 822 | { 823 symtyp = FVFT; 824 } T_COLON constant_expr { 825 $$ = bitfield(NULL, to_int_constant($3, true)); 826 } 827 ; 828 829 enum_spec: 830 enum enum_tag { 831 $$ = mktag($2, ENUM, false, false); 832 } 833 | enum enum_tag { 834 dcs->d_tagtyp = mktag($2, ENUM, true, false); 835 } enum_declaration { 836 $$ = complete_tag_enum(dcs->d_tagtyp, $4); 837 } 838 | enum { 839 dcs->d_tagtyp = mktag(NULL, ENUM, true, false); 840 } enum_declaration { 841 $$ = complete_tag_enum(dcs->d_tagtyp, $3); 842 } 843 | enum error { 844 symtyp = FVFT; 845 $$ = gettyp(INT); 846 } 847 ; 848 849 enum: 850 T_ENUM { 851 symtyp = FTAG; 852 begin_declaration_level(CTCONST); 853 } 854 ; 855 856 enum_tag: 857 identifier { 858 $$ = getsym($1); 859 } 860 ; 861 862 enum_declaration: 863 enum_decl_lbrace enumerator_list enumerator_list_comma_opt T_RBRACE { 864 $$ = $2; 865 } 866 ; 867 868 enum_decl_lbrace: 869 T_LBRACE { 870 symtyp = FVFT; 871 enumval = 0; 872 } 873 ; 874 875 enumerator_list: /* C99 6.7.2.2 */ 876 enumerator 877 | enumerator_list T_COMMA enumerator { 878 $$ = lnklst($1, $3); 879 } 880 | error { 881 $$ = NULL; 882 } 883 ; 884 885 enumerator_list_comma_opt: 886 /* empty */ 887 | T_COMMA { 888 if (sflag) { 889 /* trailing ',' prohibited in enum declaration */ 890 error(54); 891 } else { 892 /* trailing ',' prohibited in enum declaration */ 893 c99ism(54); 894 } 895 } 896 ; 897 898 enumerator: /* C99 6.7.2.2 */ 899 enumeration_constant { 900 $$ = enumeration_constant($1, enumval, true); 901 } 902 | enumeration_constant T_ASSIGN constant_expr { 903 $$ = enumeration_constant($1, to_int_constant($3, true), false); 904 } 905 ; 906 907 enumeration_constant: /* C99 6.4.4.3 */ 908 identifier { 909 $$ = getsym($1); 910 } 911 ; 912 913 914 /* 915 * For an explanation of 'notype' in the following rules, see the Bison 916 * manual, section 7.1 "Semantic Info in Token Kinds". 917 */ 918 919 notype_init_decls: 920 notype_init_decl 921 | notype_init_decls T_COMMA type_init_decl 922 ; 923 924 type_init_decls: 925 type_init_decl 926 | type_init_decls T_COMMA type_init_decl 927 ; 928 929 notype_init_decl: 930 notype_decl asm_or_symbolrename_opt { 931 cgram_declare($1, false, $2); 932 check_size($1); 933 } 934 | notype_decl asm_or_symbolrename_opt { 935 begin_initialization($1); 936 cgram_declare($1, true, $2); 937 } T_ASSIGN initializer { 938 check_size($1); 939 end_initialization(); 940 } 941 ; 942 943 type_init_decl: 944 type_decl asm_or_symbolrename_opt { 945 cgram_declare($1, false, $2); 946 check_size($1); 947 } 948 | type_decl asm_or_symbolrename_opt { 949 begin_initialization($1); 950 cgram_declare($1, true, $2); 951 } T_ASSIGN initializer { 952 check_size($1); 953 end_initialization(); 954 } 955 ; 956 957 notype_decl: 958 notype_direct_decl 959 | pointer notype_direct_decl { 960 $$ = add_pointer($2, $1); 961 } 962 ; 963 964 type_decl: 965 type_direct_decl 966 | pointer type_direct_decl { 967 $$ = add_pointer($2, $1); 968 } 969 ; 970 971 /* 972 * XXX: shift/reduce conflict, caused by: 973 * type_attribute notype_direct_decl 974 * notype_direct_decl type_attribute 975 */ 976 notype_direct_decl: 977 T_NAME { 978 $$ = declarator_name(getsym($1)); 979 } 980 | T_LPAREN type_decl T_RPAREN { 981 $$ = $2; 982 } 983 | type_attribute notype_direct_decl { 984 $$ = $2; 985 } 986 | notype_direct_decl T_LBRACK T_RBRACK { 987 $$ = add_array($1, false, 0); 988 } 989 | notype_direct_decl T_LBRACK array_size T_RBRACK { 990 $$ = add_array($1, true, to_int_constant($3, false)); 991 } 992 | notype_direct_decl param_list asm_or_symbolrename_opt { 993 $$ = add_function(symbolrename($1, $3), $2); 994 end_declaration_level(); 995 block_level--; 996 } 997 | notype_direct_decl type_attribute 998 ; 999 1000 /* 1001 * XXX: shift/reduce conflict, caused by: 1002 * type_attribute type_direct_decl 1003 * type_direct_decl type_attribute 1004 */ 1005 type_direct_decl: 1006 identifier { 1007 $$ = declarator_name(getsym($1)); 1008 } 1009 | T_LPAREN type_decl T_RPAREN { 1010 $$ = $2; 1011 } 1012 | type_attribute type_direct_decl { 1013 $$ = $2; 1014 } 1015 | type_direct_decl T_LBRACK T_RBRACK { 1016 $$ = add_array($1, false, 0); 1017 } 1018 | type_direct_decl T_LBRACK array_size T_RBRACK { 1019 $$ = add_array($1, true, to_int_constant($3, false)); 1020 } 1021 | type_direct_decl param_list asm_or_symbolrename_opt { 1022 $$ = add_function(symbolrename($1, $3), $2); 1023 end_declaration_level(); 1024 block_level--; 1025 } 1026 | type_direct_decl type_attribute 1027 ; 1028 1029 /* 1030 * The two distinct rules type_param_decl and notype_param_decl avoid a 1031 * conflict in argument lists. A typename enclosed in parentheses is always 1032 * treated as a typename, not an argument name. For example, after 1033 * "typedef double a;", the declaration "f(int (a));" is interpreted as 1034 * "f(int (double));", not "f(int a);". 1035 */ 1036 type_param_decl: 1037 direct_param_decl 1038 | pointer direct_param_decl { 1039 $$ = add_pointer($2, $1); 1040 } 1041 ; 1042 1043 notype_param_decl: 1044 direct_notype_param_decl 1045 | pointer direct_notype_param_decl { 1046 $$ = add_pointer($2, $1); 1047 } 1048 ; 1049 1050 direct_param_decl: 1051 identifier type_attribute_list { 1052 $$ = declarator_name(getsym($1)); 1053 } 1054 | identifier { 1055 $$ = declarator_name(getsym($1)); 1056 } 1057 | T_LPAREN notype_param_decl T_RPAREN { 1058 $$ = $2; 1059 } 1060 | direct_param_decl T_LBRACK T_RBRACK { 1061 $$ = add_array($1, false, 0); 1062 } 1063 | direct_param_decl T_LBRACK array_size T_RBRACK { 1064 $$ = add_array($1, true, to_int_constant($3, false)); 1065 } 1066 | direct_param_decl param_list asm_or_symbolrename_opt { 1067 $$ = add_function(symbolrename($1, $3), $2); 1068 end_declaration_level(); 1069 block_level--; 1070 } 1071 ; 1072 1073 direct_notype_param_decl: 1074 /* XXX: missing identifier type_attribute_list? */ 1075 identifier { 1076 $$ = declarator_name(getsym($1)); 1077 } 1078 | T_LPAREN notype_param_decl T_RPAREN { 1079 $$ = $2; 1080 } 1081 | direct_notype_param_decl T_LBRACK T_RBRACK { 1082 $$ = add_array($1, false, 0); 1083 } 1084 | direct_notype_param_decl T_LBRACK array_size T_RBRACK { 1085 $$ = add_array($1, true, to_int_constant($3, false)); 1086 } 1087 | direct_notype_param_decl param_list asm_or_symbolrename_opt { 1088 $$ = add_function(symbolrename($1, $3), $2); 1089 end_declaration_level(); 1090 block_level--; 1091 } 1092 ; 1093 1094 pointer: /* C99 6.7.5 */ 1095 asterisk type_qualifier_list_opt { 1096 $$ = merge_qualified_pointer($1, $2); 1097 } 1098 | asterisk type_qualifier_list_opt pointer { 1099 $$ = merge_qualified_pointer($1, $2); 1100 $$ = merge_qualified_pointer($$, $3); 1101 } 1102 ; 1103 1104 asterisk: 1105 T_ASTERISK { 1106 $$ = xcalloc(1, sizeof(*$$)); 1107 $$->p_pointer = true; 1108 } 1109 ; 1110 1111 type_qualifier_list_opt: 1112 /* empty */ { 1113 $$ = NULL; 1114 } 1115 | type_qualifier_list 1116 ; 1117 1118 type_qualifier_list: /* C99 6.7.5 */ 1119 type_qualifier 1120 | type_qualifier_list type_qualifier { 1121 $$ = merge_qualified_pointer($1, $2); 1122 } 1123 ; 1124 1125 type_qualifier: 1126 T_QUAL { 1127 $$ = xcalloc(1, sizeof(*$$)); 1128 if ($1 == CONST) { 1129 $$->p_const = true; 1130 } else if ($1 == VOLATILE) { 1131 $$->p_volatile = true; 1132 } else { 1133 lint_assert($1 == RESTRICT || $1 == THREAD); 1134 } 1135 } 1136 ; 1137 1138 align_as: /* See alignment-specifier in C11 6.7.5 */ 1139 typespec 1140 | constant_expr 1141 ; 1142 1143 param_list: 1144 id_list_lparen identifier_list T_RPAREN { 1145 $$ = $2; 1146 } 1147 | abstract_decl_param_list 1148 ; 1149 1150 id_list_lparen: 1151 T_LPAREN { 1152 block_level++; 1153 begin_declaration_level(PROTO_ARG); 1154 } 1155 ; 1156 1157 identifier_list: 1158 T_NAME { 1159 $$ = old_style_function_name(getsym($1)); 1160 } 1161 | identifier_list T_COMMA T_NAME { 1162 $$ = lnklst($1, old_style_function_name(getsym($3))); 1163 } 1164 | identifier_list error 1165 ; 1166 1167 abstract_decl_param_list: 1168 abstract_decl_lparen T_RPAREN type_attribute_opt { 1169 $$ = NULL; 1170 } 1171 | abstract_decl_lparen vararg_parameter_type_list T_RPAREN type_attribute_opt { 1172 dcs->d_proto = true; 1173 $$ = $2; 1174 } 1175 | abstract_decl_lparen error T_RPAREN type_attribute_opt { 1176 $$ = NULL; 1177 } 1178 ; 1179 1180 abstract_decl_lparen: 1181 T_LPAREN { 1182 block_level++; 1183 begin_declaration_level(PROTO_ARG); 1184 } 1185 ; 1186 1187 vararg_parameter_type_list: 1188 parameter_type_list 1189 | parameter_type_list T_COMMA T_ELLIPSIS { 1190 dcs->d_vararg = true; 1191 $$ = $1; 1192 } 1193 | T_ELLIPSIS { 1194 if (sflag) { 1195 /* ANSI C requires formal parameter before '...' */ 1196 error(84); 1197 } else if (!tflag) { 1198 /* ANSI C requires formal parameter before '...' */ 1199 warning(84); 1200 } 1201 dcs->d_vararg = true; 1202 $$ = NULL; 1203 } 1204 ; 1205 1206 parameter_type_list: 1207 parameter_declaration 1208 | parameter_type_list T_COMMA parameter_declaration { 1209 $$ = lnklst($1, $3); 1210 } 1211 ; 1212 1213 /* XXX: C99 6.7.5 defines the same name, but it looks completely different. */ 1214 parameter_declaration: 1215 declmods deftyp { 1216 $$ = declare_argument(abstract_name(), false); 1217 } 1218 | declaration_specifiers deftyp { 1219 $$ = declare_argument(abstract_name(), false); 1220 } 1221 | declmods deftyp notype_param_decl { 1222 $$ = declare_argument($3, false); 1223 } 1224 | declaration_specifiers deftyp type_param_decl { 1225 $$ = declare_argument($3, false); 1226 } 1227 | declmods deftyp abstract_declarator { 1228 $$ = declare_argument($3, false); 1229 } 1230 | declaration_specifiers deftyp abstract_declarator { 1231 $$ = declare_argument($3, false); 1232 } 1233 ; 1234 1235 asm_or_symbolrename_opt: /* expect only one */ 1236 /* empty */ { 1237 $$ = NULL; 1238 } 1239 | T_ASM T_LPAREN T_STRING T_RPAREN { 1240 freeyyv(&$3, T_STRING); 1241 $$ = NULL; 1242 } 1243 | T_SYMBOLRENAME T_LPAREN T_NAME T_RPAREN { 1244 $$ = $3; 1245 } 1246 ; 1247 1248 initializer: /* C99 6.7.8 "Initialization" */ 1249 expr %prec T_COMMA { 1250 init_expr($1); 1251 } 1252 | init_lbrace init_rbrace { 1253 /* XXX: Empty braces are not covered by C99 6.7.8. */ 1254 } 1255 | init_lbrace initializer_list comma_opt init_rbrace 1256 | error 1257 ; 1258 1259 initializer_list: /* C99 6.7.8 "Initialization" */ 1260 initializer_list_item 1261 | initializer_list T_COMMA initializer_list_item 1262 ; 1263 1264 initializer_list_item: 1265 designation initializer 1266 | initializer 1267 ; 1268 1269 designation: /* C99 6.7.8 "Initialization" */ 1270 designator_list T_ASSIGN 1271 | identifier T_COLON { 1272 /* GCC style struct or union member name in initializer */ 1273 gnuism(315); 1274 add_designator_member($1); 1275 } 1276 ; 1277 1278 designator_list: /* C99 6.7.8 "Initialization" */ 1279 designator 1280 | designator_list designator 1281 ; 1282 1283 designator: /* C99 6.7.8 "Initialization" */ 1284 T_LBRACK range T_RBRACK { 1285 add_designator_subscript($2); 1286 if (!Sflag) 1287 /* array initializer with des.s is a C9X feature */ 1288 warning(321); 1289 } 1290 | T_POINT identifier { 1291 if (!Sflag) 1292 /* struct or union member name in initializer is ... */ 1293 warning(313); 1294 add_designator_member($2); 1295 } 1296 ; 1297 1298 range: 1299 constant_expr { 1300 $$.lo = to_int_constant($1, true); 1301 $$.hi = $$.lo; 1302 } 1303 | constant_expr T_ELLIPSIS constant_expr { 1304 $$.lo = to_int_constant($1, true); 1305 $$.hi = to_int_constant($3, true); 1306 /* initialization with '[a...b]' is a GCC extension */ 1307 gnuism(340); 1308 } 1309 ; 1310 1311 init_lbrace: 1312 T_LBRACE { 1313 init_lbrace(); 1314 } 1315 ; 1316 1317 init_rbrace: 1318 T_RBRACE { 1319 init_rbrace(); 1320 } 1321 ; 1322 1323 type_name: /* C99 6.7.6 */ 1324 { 1325 begin_declaration_level(ABSTRACT); 1326 } abstract_declaration { 1327 end_declaration_level(); 1328 $$ = $2->s_type; 1329 } 1330 ; 1331 1332 abstract_declaration: 1333 noclass_declmods deftyp { 1334 $$ = declare_1_abstract(abstract_name()); 1335 } 1336 | noclass_declspecs deftyp { 1337 $$ = declare_1_abstract(abstract_name()); 1338 } 1339 | noclass_declmods deftyp abstract_declarator { 1340 $$ = declare_1_abstract($3); 1341 } 1342 | noclass_declspecs deftyp abstract_declarator { 1343 $$ = declare_1_abstract($3); 1344 } 1345 ; 1346 1347 abstract_declarator: /* C99 6.7.6 */ 1348 pointer { 1349 $$ = add_pointer(abstract_name(), $1); 1350 } 1351 | direct_abstract_declarator 1352 | pointer direct_abstract_declarator { 1353 $$ = add_pointer($2, $1); 1354 } 1355 | T_TYPEOF term { /* GCC extension */ 1356 $$ = mktempsym($2->tn_type); 1357 } 1358 ; 1359 1360 /* 1361 * XXX: shift/reduce conflict, caused by: 1362 * type_attribute direct_abstract_declarator 1363 * direct_abstract_declarator type_attribute 1364 */ 1365 direct_abstract_declarator: /* C99 6.7.6 */ 1366 T_LPAREN abstract_declarator T_RPAREN { 1367 $$ = $2; 1368 } 1369 | T_LBRACK T_RBRACK { 1370 $$ = add_array(abstract_name(), false, 0); 1371 } 1372 | T_LBRACK array_size T_RBRACK { 1373 $$ = add_array(abstract_name(), true, to_int_constant($2, false)); 1374 } 1375 | type_attribute direct_abstract_declarator { 1376 $$ = $2; 1377 } 1378 | direct_abstract_declarator T_LBRACK T_RBRACK { 1379 $$ = add_array($1, false, 0); 1380 } 1381 | direct_abstract_declarator T_LBRACK T_ASTERISK T_RBRACK { /* C99 */ 1382 $$ = add_array($1, false, 0); 1383 } 1384 | direct_abstract_declarator T_LBRACK array_size T_RBRACK { 1385 $$ = add_array($1, true, to_int_constant($3, false)); 1386 } 1387 | abstract_decl_param_list asm_or_symbolrename_opt { 1388 $$ = add_function(symbolrename(abstract_name(), $2), $1); 1389 end_declaration_level(); 1390 block_level--; 1391 } 1392 | direct_abstract_declarator abstract_decl_param_list asm_or_symbolrename_opt { 1393 $$ = add_function(symbolrename($1, $3), $2); 1394 end_declaration_level(); 1395 block_level--; 1396 } 1397 | direct_abstract_declarator type_attribute 1398 ; 1399 1400 array_size: 1401 type_qualifier_list_opt T_SCLASS constant_expr { 1402 /* C11 6.7.6.3p7 */ 1403 if ($2 != STATIC) 1404 yyerror("Bad attribute"); 1405 /* static array size is a C11 extension */ 1406 c11ism(343); 1407 $$ = $3; 1408 } 1409 | constant_expr 1410 ; 1411 1412 non_expr_statement: 1413 type_attribute T_SEMI 1414 | labeled_statement 1415 | compound_statement 1416 | selection_statement 1417 | iteration_statement 1418 | jump_statement { 1419 seen_fallthrough = false; 1420 } 1421 | asm_statement 1422 ; 1423 1424 statement: /* C99 6.8 */ 1425 expr_statement 1426 | non_expr_statement 1427 ; 1428 1429 labeled_statement: /* C99 6.8.1 */ 1430 label gcc_attribute_list_opt statement 1431 ; 1432 1433 label: 1434 T_NAME T_COLON { 1435 symtyp = FLABEL; 1436 named_label(getsym($1)); 1437 } 1438 | T_CASE constant_expr T_COLON { 1439 case_label($2); 1440 seen_fallthrough = true; 1441 } 1442 | T_CASE constant_expr T_ELLIPSIS constant_expr T_COLON { 1443 /* XXX: We don't fill all cases */ 1444 case_label($2); 1445 seen_fallthrough = true; 1446 } 1447 | T_DEFAULT T_COLON { 1448 default_label(); 1449 seen_fallthrough = true; 1450 } 1451 ; 1452 1453 compound_statement: /* C99 6.8.2 */ 1454 compound_statement_lbrace compound_statement_rbrace 1455 | compound_statement_lbrace block_item_list compound_statement_rbrace 1456 ; 1457 1458 compound_statement_lbrace: 1459 T_LBRACE { 1460 block_level++; 1461 mem_block_level++; 1462 begin_declaration_level(AUTO); 1463 } 1464 ; 1465 1466 compound_statement_rbrace: 1467 T_RBRACE { 1468 end_declaration_level(); 1469 freeblk(); 1470 mem_block_level--; 1471 block_level--; 1472 seen_fallthrough = false; 1473 } 1474 ; 1475 1476 block_item_list: 1477 block_item 1478 | block_item_list block_item { 1479 if (!Sflag && $1 && !$2) 1480 /* declarations after statements is a C99 feature */ 1481 c99ism(327); 1482 $$ = $1 || $2; 1483 } 1484 ; 1485 1486 block_item: 1487 statement { 1488 $$ = true; 1489 restore_warning_flags(); 1490 } 1491 | declaration { 1492 $$ = false; 1493 restore_warning_flags(); 1494 } 1495 ; 1496 1497 expr_statement: 1498 expr T_SEMI { 1499 expr($1, false, false, false, false); 1500 seen_fallthrough = false; 1501 } 1502 | T_SEMI { 1503 seen_fallthrough = false; 1504 } 1505 ; 1506 1507 selection_statement: /* C99 6.8.4 */ 1508 if_without_else { 1509 save_warning_flags(); 1510 if2(); 1511 if3(false); 1512 } 1513 | if_without_else T_ELSE { 1514 save_warning_flags(); 1515 if2(); 1516 } statement { 1517 clear_warning_flags(); 1518 if3(true); 1519 } 1520 | if_without_else T_ELSE error { 1521 clear_warning_flags(); 1522 if3(false); 1523 } 1524 | switch_expr statement { 1525 clear_warning_flags(); 1526 switch2(); 1527 } 1528 | switch_expr error { 1529 clear_warning_flags(); 1530 switch2(); 1531 } 1532 ; 1533 1534 if_without_else: 1535 if_expr statement 1536 | if_expr error 1537 ; 1538 1539 if_expr: 1540 T_IF T_LPAREN expr T_RPAREN { 1541 if1($3); 1542 clear_warning_flags(); 1543 } 1544 ; 1545 1546 switch_expr: 1547 T_SWITCH T_LPAREN expr T_RPAREN { 1548 switch1($3); 1549 clear_warning_flags(); 1550 } 1551 ; 1552 1553 do_statement: /* C99 6.8.5 */ 1554 do statement { 1555 clear_warning_flags(); 1556 } 1557 ; 1558 1559 iteration_statement: /* C99 6.8.5 */ 1560 while_expr statement { 1561 clear_warning_flags(); 1562 while2(); 1563 } 1564 | while_expr error { 1565 clear_warning_flags(); 1566 while2(); 1567 } 1568 | do_statement do_while_expr { 1569 do2($2); 1570 seen_fallthrough = false; 1571 } 1572 | do error { 1573 clear_warning_flags(); 1574 do2(NULL); 1575 } 1576 | for_exprs statement { 1577 clear_warning_flags(); 1578 for2(); 1579 end_declaration_level(); 1580 block_level--; 1581 } 1582 | for_exprs error { 1583 clear_warning_flags(); 1584 for2(); 1585 end_declaration_level(); 1586 block_level--; 1587 } 1588 ; 1589 1590 while_expr: 1591 T_WHILE T_LPAREN expr T_RPAREN { 1592 while1($3); 1593 clear_warning_flags(); 1594 } 1595 ; 1596 1597 do: 1598 T_DO { 1599 do1(); 1600 } 1601 ; 1602 1603 do_while_expr: 1604 T_WHILE T_LPAREN expr T_RPAREN T_SEMI { 1605 $$ = $3; 1606 } 1607 ; 1608 1609 for_start: 1610 T_FOR T_LPAREN { 1611 begin_declaration_level(AUTO); 1612 block_level++; 1613 } 1614 ; 1615 1616 for_exprs: 1617 for_start declaration_specifiers deftyp notype_init_decls T_SEMI 1618 expr_opt T_SEMI expr_opt T_RPAREN { 1619 /* variable declaration in for loop */ 1620 c99ism(325); 1621 for1(NULL, $6, $8); 1622 clear_warning_flags(); 1623 } 1624 | for_start expr_opt T_SEMI expr_opt T_SEMI expr_opt T_RPAREN { 1625 for1($2, $4, $6); 1626 clear_warning_flags(); 1627 } 1628 ; 1629 1630 expr_opt: 1631 /* empty */ { 1632 $$ = NULL; 1633 } 1634 | expr 1635 ; 1636 1637 jump_statement: /* C99 6.8.6 */ 1638 goto identifier T_SEMI { 1639 do_goto(getsym($2)); 1640 } 1641 | goto error T_SEMI { 1642 symtyp = FVFT; 1643 } 1644 | T_CONTINUE T_SEMI { 1645 do_continue(); 1646 } 1647 | T_BREAK T_SEMI { 1648 do_break(); 1649 } 1650 | T_RETURN T_SEMI { 1651 do_return(NULL); 1652 } 1653 | T_RETURN expr T_SEMI { 1654 do_return($2); 1655 } 1656 ; 1657 1658 goto: 1659 T_GOTO { 1660 symtyp = FLABEL; 1661 } 1662 ; 1663 1664 asm_statement: 1665 T_ASM T_LPAREN read_until_rparen T_SEMI { 1666 setasm(); 1667 } 1668 | T_ASM T_QUAL T_LPAREN read_until_rparen T_SEMI { 1669 setasm(); 1670 } 1671 | T_ASM error 1672 ; 1673 1674 read_until_rparen: 1675 /* empty */ { 1676 ignore_up_to_rparen(); 1677 } 1678 ; 1679 1680 constant_expr_list_opt: 1681 /* empty */ 1682 | constant_expr_list 1683 ; 1684 1685 constant_expr_list: 1686 constant_expr 1687 | constant_expr_list T_COMMA constant_expr 1688 ; 1689 1690 constant_expr: /* C99 6.6 */ 1691 expr %prec T_ASSIGN 1692 ; 1693 1694 expr: 1695 expr T_ASTERISK expr { 1696 $$ = build(MULT, $1, $3); 1697 } 1698 | expr T_MULTIPLICATIVE expr { 1699 $$ = build($2, $1, $3); 1700 } 1701 | expr T_ADDITIVE expr { 1702 $$ = build($2, $1, $3); 1703 } 1704 | expr T_SHIFT expr { 1705 $$ = build($2, $1, $3); 1706 } 1707 | expr T_RELATIONAL expr { 1708 $$ = build($2, $1, $3); 1709 } 1710 | expr T_EQUALITY expr { 1711 $$ = build($2, $1, $3); 1712 } 1713 | expr T_AMPER expr { 1714 $$ = build(BITAND, $1, $3); 1715 } 1716 | expr T_BITXOR expr { 1717 $$ = build(BITXOR, $1, $3); 1718 } 1719 | expr T_BITOR expr { 1720 $$ = build(BITOR, $1, $3); 1721 } 1722 | expr T_LOGAND expr { 1723 $$ = build(LOGAND, $1, $3); 1724 } 1725 | expr T_LOGOR expr { 1726 $$ = build(LOGOR, $1, $3); 1727 } 1728 | expr T_QUEST expr T_COLON expr { 1729 $$ = build(QUEST, $1, build(COLON, $3, $5)); 1730 } 1731 | expr T_ASSIGN expr { 1732 $$ = build(ASSIGN, $1, $3); 1733 } 1734 | expr T_OPASSIGN expr { 1735 $$ = build($2, $1, $3); 1736 } 1737 | expr T_COMMA expr { 1738 $$ = build(COMMA, $1, $3); 1739 } 1740 | term 1741 | generic_selection 1742 ; 1743 1744 assignment_expression: /* C99 6.5.16 */ 1745 expr %prec T_ASSIGN 1746 ; 1747 1748 term: 1749 T_NAME { 1750 /* XXX really necessary? */ 1751 if (yychar < 0) 1752 yychar = yylex(); 1753 $$ = new_name_node(getsym($1), yychar); 1754 } 1755 | string { 1756 $$ = new_string_node($1); 1757 } 1758 | T_CON { 1759 $$ = expr_new_constant(gettyp($1->v_tspec), $1); 1760 } 1761 | T_LPAREN expr T_RPAREN { 1762 if ($2 != NULL) 1763 $2->tn_parenthesized = true; 1764 $$ = $2; 1765 } 1766 | T_LPAREN compound_statement_lbrace gcc_statement_expr_list { 1767 block_level--; 1768 mem_block_level--; 1769 begin_initialization(mktempsym(dup_type($3->tn_type))); 1770 mem_block_level++; 1771 block_level++; 1772 /* ({ }) is a GCC extension */ 1773 gnuism(320); 1774 } compound_statement_rbrace T_RPAREN { 1775 $$ = new_name_node(*current_initsym(), 0); 1776 end_initialization(); 1777 } 1778 | term T_INCDEC { 1779 $$ = build($2 == INC ? INCAFT : DECAFT, $1, NULL); 1780 } 1781 | T_INCDEC term { 1782 $$ = build($1 == INC ? INCBEF : DECBEF, $2, NULL); 1783 } 1784 | T_ASTERISK term { 1785 $$ = build(INDIR, $2, NULL); 1786 } 1787 | T_AMPER term { 1788 $$ = build(ADDR, $2, NULL); 1789 } 1790 | T_UNARY term { 1791 $$ = build($1, $2, NULL); 1792 } 1793 | T_ADDITIVE term { 1794 if (tflag && $1 == PLUS) { 1795 /* unary + is illegal in traditional C */ 1796 warning(100); 1797 } 1798 $$ = build($1 == PLUS ? UPLUS : UMINUS, $2, NULL); 1799 } 1800 | term T_LBRACK expr T_RBRACK { 1801 $$ = build(INDIR, build(PLUS, $1, $3), NULL); 1802 } 1803 | term T_LPAREN T_RPAREN { 1804 $$ = new_function_call_node($1, NULL); 1805 } 1806 | term T_LPAREN func_arg_list T_RPAREN { 1807 $$ = new_function_call_node($1, $3); 1808 } 1809 | term point_or_arrow T_NAME { 1810 if ($1 != NULL) { 1811 sym_t *msym; 1812 /* 1813 * XXX struct_or_union_member should be integrated 1814 * in build() 1815 */ 1816 if ($2 == ARROW) { 1817 /* 1818 * must do this before struct_or_union_member 1819 * is called 1820 */ 1821 $1 = cconv($1); 1822 } 1823 msym = struct_or_union_member($1, $2, getsym($3)); 1824 $$ = build($2, $1, new_name_node(msym, 0)); 1825 } else { 1826 $$ = NULL; 1827 } 1828 } 1829 | T_REAL term { 1830 $$ = build(REAL, $2, NULL); 1831 } 1832 | T_IMAG term { 1833 $$ = build(IMAG, $2, NULL); 1834 } 1835 | T_EXTENSION term { 1836 $$ = $2; 1837 } 1838 | T_BUILTIN_OFFSETOF T_LPAREN type_name T_COMMA identifier T_RPAREN { 1839 symtyp = FMEMBER; 1840 $$ = build_offsetof($3, getsym($5)); 1841 } 1842 | T_SIZEOF term { 1843 $$ = $2 == NULL ? NULL : build_sizeof($2->tn_type); 1844 if ($$ != NULL) 1845 check_expr_misc($2, false, false, false, false, false, true); 1846 } 1847 | T_SIZEOF T_LPAREN type_name T_RPAREN %prec T_SIZEOF { 1848 $$ = build_sizeof($3); 1849 } 1850 | T_ALIGNOF T_LPAREN type_name T_RPAREN { 1851 $$ = build_alignof($3); 1852 } 1853 | T_LPAREN type_name T_RPAREN term %prec T_UNARY { 1854 $$ = cast($4, $2); 1855 } 1856 | T_LPAREN type_name T_RPAREN { /* C99 6.5.2.5 "Compound literals" */ 1857 sym_t *tmp = mktempsym($2); 1858 begin_initialization(tmp); 1859 cgram_declare(tmp, true, NULL); 1860 } init_lbrace initializer_list comma_opt init_rbrace { 1861 if (!Sflag) 1862 /* compound literals are a C9X/GCC extension */ 1863 gnuism(319); 1864 $$ = new_name_node(*current_initsym(), 0); 1865 end_initialization(); 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 /* 1900 * The inner part of a GCC statement-expression of the form ({ ... }). 1901 * 1902 * https://gcc.gnu.org/onlinedocs/gcc/Statement-Exprs.html 1903 */ 1904 gcc_statement_expr_list: 1905 gcc_statement_expr_item 1906 | gcc_statement_expr_list gcc_statement_expr_item { 1907 $$ = $2; 1908 } 1909 ; 1910 1911 gcc_statement_expr_item: 1912 declaration { 1913 clear_warning_flags(); 1914 $$ = NULL; 1915 } 1916 | non_expr_statement { 1917 $$ = expr_zalloc_tnode(); 1918 $$->tn_type = gettyp(VOID); 1919 } 1920 | expr T_SEMI { 1921 if ($1 == NULL) { /* in case of syntax errors */ 1922 $$ = expr_zalloc_tnode(); 1923 $$->tn_type = gettyp(VOID); 1924 } else { 1925 /* XXX: do that only on the last name */ 1926 if ($1->tn_op == NAME) 1927 $1->tn_sym->s_used = true; 1928 $$ = $1; 1929 expr($1, false, false, false, false); 1930 seen_fallthrough = false; 1931 } 1932 } 1933 ; 1934 1935 string: 1936 T_STRING 1937 | T_STRING string2 { 1938 $$ = cat_strings($1, $2); 1939 } 1940 ; 1941 1942 string2: 1943 T_STRING { 1944 if (tflag) { 1945 /* concatenated strings are illegal in traditional C */ 1946 warning(219); 1947 } 1948 $$ = $1; 1949 } 1950 | string2 T_STRING { 1951 $$ = cat_strings($1, $2); 1952 } 1953 ; 1954 1955 func_arg_list: 1956 expr %prec T_COMMA { 1957 $$ = new_function_argument_node(NULL, $1); 1958 } 1959 | func_arg_list T_COMMA expr { 1960 $$ = new_function_argument_node($1, $3); 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: /* C99 6.4.2.1 */ 1976 T_NAME { 1977 $$ = $1; 1978 cgram_debug("name '%s'", $$->sb_name); 1979 } 1980 | T_TYPENAME { 1981 $$ = $1; 1982 cgram_debug("typename '%s'", $$->sb_name); 1983 } 1984 ; 1985 1986 comma_opt: 1987 /* empty */ 1988 | T_COMMA 1989 ; 1990 1991 /* GCC extensions */ 1992 1993 type_attribute_list: 1994 type_attribute 1995 | type_attribute_list type_attribute 1996 ; 1997 1998 type_attribute: 1999 gcc_attribute 2000 | T_ALIGNAS T_LPAREN align_as T_RPAREN 2001 | T_PACKED { 2002 addpacked(); 2003 } 2004 | T_NORETURN 2005 ; 2006 2007 gcc_attribute_list_opt: 2008 /* empty */ 2009 | gcc_attribute_list 2010 ; 2011 2012 gcc_attribute_list: 2013 gcc_attribute 2014 | gcc_attribute_list gcc_attribute 2015 ; 2016 2017 /* https://gcc.gnu.org/onlinedocs/gcc/Attribute-Syntax.html */ 2018 gcc_attribute: 2019 T_ATTRIBUTE T_LPAREN T_LPAREN { 2020 attron = true; 2021 } gcc_attribute_spec_list { 2022 attron = false; 2023 } T_RPAREN T_RPAREN 2024 ; 2025 2026 gcc_attribute_spec_list: 2027 gcc_attribute_spec 2028 | gcc_attribute_spec_list T_COMMA gcc_attribute_spec 2029 ; 2030 2031 gcc_attribute_spec: 2032 /* empty */ 2033 | T_AT_ALWAYS_INLINE 2034 | T_AT_ALIAS T_LPAREN string T_RPAREN 2035 | T_AT_ALIGNED T_LPAREN constant_expr T_RPAREN 2036 | T_AT_ALIGNED 2037 | T_AT_ALLOC_SIZE T_LPAREN constant_expr T_COMMA constant_expr T_RPAREN 2038 | T_AT_ALLOC_SIZE T_LPAREN constant_expr T_RPAREN 2039 | T_AT_BOUNDED T_LPAREN gcc_attribute_bounded 2040 T_COMMA constant_expr T_COMMA constant_expr T_RPAREN 2041 | T_AT_COLD 2042 | T_AT_COMMON 2043 | T_AT_CONSTRUCTOR T_LPAREN constant_expr T_RPAREN 2044 | T_AT_CONSTRUCTOR 2045 | T_AT_DEPRECATED T_LPAREN string T_RPAREN 2046 | T_AT_DEPRECATED 2047 | T_AT_DESTRUCTOR T_LPAREN constant_expr T_RPAREN 2048 | T_AT_DESTRUCTOR 2049 | T_AT_FALLTHROUGH { 2050 fallthru(1); 2051 } 2052 | T_AT_FORMAT T_LPAREN gcc_attribute_format T_COMMA 2053 constant_expr T_COMMA constant_expr T_RPAREN 2054 | T_AT_FORMAT_ARG T_LPAREN constant_expr T_RPAREN 2055 | T_AT_GNU_INLINE 2056 | T_AT_MALLOC 2057 | T_AT_MAY_ALIAS 2058 | T_AT_MODE T_LPAREN T_NAME T_RPAREN 2059 | T_AT_NOINLINE 2060 | T_AT_NONNULL T_LPAREN constant_expr_list_opt T_RPAREN 2061 | T_AT_NONNULL 2062 | T_AT_NONSTRING 2063 | T_AT_NORETURN 2064 | T_AT_NOTHROW 2065 | T_AT_NO_INSTRUMENT_FUNCTION 2066 | T_AT_OPTIMIZE T_LPAREN string T_RPAREN 2067 | T_AT_PACKED { 2068 addpacked(); 2069 } 2070 | T_AT_PCS T_LPAREN string T_RPAREN 2071 | T_AT_PURE 2072 | T_AT_RETURNS_TWICE 2073 | T_AT_SECTION T_LPAREN string T_RPAREN 2074 | T_AT_SENTINEL T_LPAREN constant_expr T_RPAREN 2075 | T_AT_SENTINEL 2076 | T_AT_TLS_MODEL T_LPAREN string T_RPAREN 2077 | T_AT_TUNION 2078 | T_AT_UNUSED { 2079 add_attr_used(); 2080 } 2081 | T_AT_USED { 2082 add_attr_used(); 2083 } 2084 | T_AT_VISIBILITY T_LPAREN constant_expr T_RPAREN 2085 | T_AT_WARN_UNUSED_RESULT 2086 | T_AT_WEAK 2087 | T_QUAL { 2088 if ($1 != CONST) 2089 yyerror("Bad attribute"); 2090 } 2091 ; 2092 2093 gcc_attribute_bounded: 2094 T_AT_MINBYTES 2095 | T_AT_STRING 2096 | T_AT_BUFFER 2097 ; 2098 2099 gcc_attribute_format: 2100 T_AT_FORMAT_GNU_PRINTF 2101 | T_AT_FORMAT_PRINTF 2102 | T_AT_FORMAT_SCANF 2103 | T_AT_FORMAT_STRFMON 2104 | T_AT_FORMAT_STRFTIME 2105 | T_AT_FORMAT_SYSLOG 2106 ; 2107 2108 %% 2109 2110 /* ARGSUSED */ 2111 int 2112 yyerror(const char *msg) 2113 { 2114 /* syntax error '%s' */ 2115 error(249, yytext); 2116 if (++sytxerr >= 5) 2117 norecover(); 2118 return 0; 2119 } 2120 2121 static void 2122 cgram_declare(sym_t *decl, bool initflg, sbuf_t *renaming) 2123 { 2124 declare(decl, initflg, renaming); 2125 if (renaming != NULL) 2126 freeyyv(&renaming, T_NAME); 2127 } 2128 2129 /* 2130 * Discard all input tokens up to and including the next 2131 * unmatched right paren 2132 */ 2133 static void 2134 ignore_up_to_rparen(void) 2135 { 2136 int level; 2137 2138 if (yychar < 0) 2139 yychar = yylex(); 2140 freeyyv(&yylval, yychar); 2141 2142 level = 1; 2143 while (yychar != T_RPAREN || --level > 0) { 2144 if (yychar == T_LPAREN) { 2145 level++; 2146 } else if (yychar <= 0) { 2147 break; 2148 } 2149 freeyyv(&yylval, yychar = yylex()); 2150 } 2151 2152 yyclearin; 2153 } 2154 2155 static sym_t * 2156 symbolrename(sym_t *s, sbuf_t *sb) 2157 { 2158 if (sb != NULL) 2159 s->s_rename = sb->sb_name; 2160 return s; 2161 } 2162
Indexes created Thu Oct 02 01:09:59 GMT 2025