cgram.y revision 1.294
1 %{ 2 /* $NetBSD: cgram.y,v 1.294 2021/07/10 17:06:56 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 1.294 2021/07/10 17:06:56 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 136 127 128 %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> notype_typespec 285 %type <y_type> struct_spec 286 %type <y_type> enum_spec 287 %type <y_sym> struct_tag 288 %type <y_sym> enum_tag 289 %type <y_tspec> struct 290 %type <y_sym> struct_declaration 291 %type <y_sb> identifier 292 %type <y_sym> member_declaration_list_semi 293 %type <y_sym> member_declaration_list 294 %type <y_sym> member_declaration 295 %type <y_sym> notype_member_decls 296 %type <y_sym> type_member_decls 297 %type <y_sym> notype_member_decl 298 %type <y_sym> type_member_decl 299 %type <y_tnode> constant_expr 300 %type <y_tnode> array_size 301 %type <y_sym> enum_declaration 302 %type <y_sym> enumerator_list 303 %type <y_sym> enumerator 304 %type <y_sym> enumeration_constant 305 %type <y_sym> notype_direct_decl 306 %type <y_sym> type_direct_decl 307 %type <y_qual_ptr> pointer 308 %type <y_qual_ptr> asterisk 309 %type <y_sym> type_param_decl 310 %type <y_sym> param_list 311 %type <y_sym> abstract_decl_param_list 312 %type <y_sym> direct_param_decl 313 %type <y_sym> notype_param_decl 314 %type <y_sym> direct_notype_param_decl 315 %type <y_qual_ptr> type_qualifier_list_opt 316 %type <y_qual_ptr> type_qualifier_list 317 %type <y_qual_ptr> type_qualifier 318 %type <y_sym> identifier_list 319 %type <y_sym> abstract_declarator 320 %type <y_sym> direct_abstract_declarator 321 %type <y_sym> direct_abstract_declarator_postfix 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> expr_opt 336 %type <y_string> string 337 %type <y_string> string2 338 %type <y_sb> asm_or_symbolrename_opt 339 %type <y_range> range 340 %type <y_seen_statement> block_item_list 341 %type <y_seen_statement> block_item 342 %type <y_generic> generic_assoc_list 343 %type <y_generic> generic_association 344 345 %% 346 347 program: 348 /* empty */ { 349 if (sflag) { 350 /* empty translation unit */ 351 error(272); 352 } else if (!tflag) { 353 /* empty translation unit */ 354 warning(272); 355 } 356 } 357 | translation_unit 358 ; 359 360 translation_unit: /* C99 6.9 */ 361 external_declaration 362 | translation_unit external_declaration 363 ; 364 365 external_declaration: /* C99 6.9 */ 366 asm_statement 367 | function_definition { 368 global_clean_up_decl(false); 369 clear_warning_flags(); 370 } 371 | top_level_declaration { 372 global_clean_up_decl(false); 373 clear_warning_flags(); 374 } 375 ; 376 377 /* 378 * On the top level, lint allows several forms of declarations that it doesn't 379 * allow in functions. For example, a single ';' is an empty declaration and 380 * is supported by some compilers, but in a function it would be an empty 381 * statement, not a declaration. This makes a difference in C90 mode, where 382 * a statement must not be followed by a declaration. 383 * 384 * See 'declaration' for all other declarations. 385 */ 386 top_level_declaration: /* C99 6.9 calls this 'declaration' */ 387 T_SEMI { 388 if (sflag) { 389 /* empty declaration */ 390 error(0); 391 } else if (!tflag) { 392 /* empty declaration */ 393 warning(0); 394 } 395 } 396 | clrtyp deftyp notype_init_decls T_SEMI { 397 if (sflag) { 398 /* old style declaration; add 'int' */ 399 error(1); 400 } else if (!tflag) { 401 /* old style declaration; add 'int' */ 402 warning(1); 403 } 404 } 405 | declaration_noerror 406 | error T_SEMI { 407 global_clean_up(); 408 } 409 | error T_RBRACE { 410 global_clean_up(); 411 } 412 ; 413 414 function_definition: /* C99 6.9.1 */ 415 func_decl { 416 if ($1->s_type->t_tspec != FUNC) { 417 /* syntax error '%s' */ 418 error(249, yytext); 419 YYERROR; 420 } 421 if ($1->s_type->t_typedef) { 422 /* ()-less function definition */ 423 error(64); 424 YYERROR; 425 } 426 funcdef($1); 427 block_level++; 428 begin_declaration_level(ARG); 429 if (lwarn == LWARN_NONE) 430 $1->s_used = true; 431 } arg_declaration_list_opt { 432 end_declaration_level(); 433 block_level--; 434 check_func_lint_directives(); 435 check_func_old_style_arguments(); 436 begin_control_statement(CS_FUNCTION_BODY); 437 } compound_statement { 438 funcend(); 439 end_control_statement(CS_FUNCTION_BODY); 440 } 441 ; 442 443 func_decl: 444 clrtyp deftyp notype_decl { 445 $$ = $3; 446 } 447 | clrtyp declmods deftyp notype_decl { 448 $$ = $4; 449 } 450 | clrtyp declaration_specifiers deftyp type_decl { 451 $$ = $4; 452 } 453 ; 454 455 arg_declaration_list_opt: /* C99 6.9.1p13 example 1 */ 456 /* empty */ 457 | arg_declaration_list 458 ; 459 460 arg_declaration_list: /* C99 6.9.1p13 example 1 */ 461 arg_declaration 462 | arg_declaration_list arg_declaration 463 /* XXX or better "arg_declaration error" ? */ 464 | error 465 ; 466 467 /* 468 * "arg_declaration" is separated from "declaration" because it 469 * needs other error handling. 470 */ 471 arg_declaration: 472 clrtyp declmods deftyp T_SEMI { 473 /* empty declaration */ 474 warning(2); 475 } 476 | clrtyp declmods deftyp notype_init_decls T_SEMI 477 | clrtyp declaration_specifiers deftyp T_SEMI { 478 if (!dcs->d_nonempty_decl) { 479 /* empty declaration */ 480 warning(2); 481 } else { 482 /* '%s' declared in argument declaration list */ 483 warning(3, type_name(dcs->d_type)); 484 } 485 } 486 | clrtyp declaration_specifiers deftyp type_init_decls T_SEMI { 487 if (dcs->d_nonempty_decl) { 488 /* '%s' declared in argument declaration list */ 489 warning(3, type_name(dcs->d_type)); 490 } 491 } 492 | clrtyp declmods error 493 | clrtyp declaration_specifiers error 494 ; 495 496 declaration: /* C99 6.7 */ 497 declaration_noerror 498 | error T_SEMI 499 ; 500 501 declaration_noerror: /* see C99 6.7 'declaration' */ 502 clrtyp declmods deftyp T_SEMI { 503 if (dcs->d_scl == TYPEDEF) { 504 /* typedef declares no type name */ 505 warning(72); 506 } else { 507 /* empty declaration */ 508 warning(2); 509 } 510 } 511 | clrtyp declmods deftyp notype_init_decls T_SEMI 512 | clrtyp declaration_specifiers deftyp T_SEMI { 513 if (dcs->d_scl == TYPEDEF) { 514 /* typedef declares no type name */ 515 warning(72); 516 } else if (!dcs->d_nonempty_decl) { 517 /* empty declaration */ 518 warning(2); 519 } 520 } 521 | clrtyp declaration_specifiers deftyp type_init_decls T_SEMI 522 ; 523 524 clrtyp: 525 /* empty */ { 526 clrtyp(); 527 } 528 ; 529 530 deftyp: 531 /* empty */ { 532 deftyp(); 533 } 534 ; 535 536 declaration_specifiers: /* C99 6.7 */ 537 typespec { 538 add_type($1); 539 } 540 | declmods typespec { 541 add_type($2); 542 } 543 | type_attribute declaration_specifiers 544 | declaration_specifiers declmod 545 | declaration_specifiers notype_typespec { 546 add_type($2); 547 } 548 ; 549 550 declmods: 551 qualifier_or_storage_class 552 | declmods declmod 553 ; 554 555 declmod: 556 qualifier_or_storage_class 557 | type_attribute 558 ; 559 560 qualifier_or_storage_class: 561 T_QUAL { 562 add_qualifier($1); 563 } 564 | T_SCLASS { 565 add_storage_class($1); 566 } 567 ; 568 569 typespec: 570 notype_typespec 571 | T_TYPENAME { 572 $$ = getsym($1)->s_type; 573 } 574 ; 575 576 notype_typespec: 577 T_TYPE { 578 $$ = gettyp($1); 579 } 580 | T_TYPEOF term { 581 $$ = $2->tn_type; 582 } 583 | struct_spec { 584 end_declaration_level(); 585 $$ = $1; 586 } 587 | enum_spec { 588 end_declaration_level(); 589 $$ = $1; 590 } 591 ; 592 593 struct_spec: 594 struct struct_tag { 595 /* 596 * STDC requires that "struct a;" always introduces 597 * a new tag if "a" is not declared at current level 598 * 599 * yychar is valid because otherwise the parser would not 600 * have been able to decide if it must shift or reduce 601 */ 602 $$ = mktag($2, $1, false, yychar == T_SEMI); 603 } 604 | struct struct_tag { 605 dcs->d_tagtyp = mktag($2, $1, true, false); 606 } struct_declaration { 607 $$ = complete_tag_struct_or_union(dcs->d_tagtyp, $4); 608 } 609 | struct { 610 dcs->d_tagtyp = mktag(NULL, $1, true, false); 611 } struct_declaration { 612 $$ = complete_tag_struct_or_union(dcs->d_tagtyp, $3); 613 } 614 | struct error { 615 symtyp = FVFT; 616 $$ = gettyp(INT); 617 } 618 ; 619 620 struct: 621 T_STRUCT_OR_UNION { 622 symtyp = FTAG; 623 begin_declaration_level($1 == STRUCT ? MOS : MOU); 624 dcs->d_offset = 0; 625 dcs->d_sou_align_in_bits = CHAR_SIZE; 626 } type_attribute_list_opt 627 ; 628 629 struct_tag: 630 identifier { 631 $$ = getsym($1); 632 } 633 ; 634 635 struct_declaration: 636 T_LBRACE { 637 symtyp = FVFT; 638 } member_declaration_list_semi T_RBRACE { 639 $$ = $3; 640 } 641 ; 642 643 member_declaration_list_semi: 644 /* empty */ { 645 $$ = NULL; 646 } 647 | member_declaration_list T_SEMI 648 | member_declaration_list { 649 if (sflag) { 650 /* syntax req. ';' after last struct/union member */ 651 error(66); 652 } else { 653 /* syntax req. ';' after last struct/union member */ 654 warning(66); 655 } 656 $$ = $1; 657 } 658 ; 659 660 member_declaration_list: 661 member_declaration 662 | member_declaration_list T_SEMI member_declaration { 663 $$ = lnklst($1, $3); 664 } 665 ; 666 667 member_declaration: 668 clrtyp add_type_qualifier_list deftyp { 669 /* too late, i know, but getsym() compensates it */ 670 symtyp = FMEMBER; 671 } notype_member_decls type_attribute_opt { 672 symtyp = FVFT; 673 $$ = $5; 674 } 675 | noclass_declspecs deftyp { 676 symtyp = FMEMBER; 677 } type_member_decls type_attribute_opt { 678 symtyp = FVFT; 679 $$ = $4; 680 } 681 | clrtyp add_type_qualifier_list deftyp type_attribute_opt { 682 /* syntax error '%s' */ 683 error(249, "member without type"); 684 $$ = NULL; 685 } 686 | noclass_declspecs deftyp type_attribute_opt { 687 symtyp = FVFT; 688 if (!Sflag) 689 /* anonymous struct/union members is a C9X feature */ 690 warning(49); 691 if (is_struct_or_union(dcs->d_type->t_tspec)) { 692 $$ = dcs->d_type->t_str->sou_first_member; 693 /* add all the members of the anonymous struct/union */ 694 anonymize($$); 695 } else { 696 /* syntax error '%s' */ 697 error(249, "unnamed member"); 698 $$ = NULL; 699 } 700 } 701 | error { 702 symtyp = FVFT; 703 $$ = NULL; 704 } 705 ; 706 707 noclass_declspecs: 708 noclass_declspecs_postfix 709 | type_attribute noclass_declspecs_postfix 710 ; 711 712 /* TODO: pair up clrtyp with deftyp */ 713 noclass_declspecs_postfix: 714 clrtyp typespec { 715 add_type($2); 716 } 717 | clrtyp add_type_qualifier_list typespec { 718 add_type($3); 719 } 720 | noclass_declspecs_postfix T_QUAL { 721 add_qualifier($2); 722 } 723 | noclass_declspecs_postfix notype_typespec { 724 add_type($2); 725 } 726 | noclass_declspecs_postfix type_attribute 727 ; 728 729 add_type_qualifier_list: 730 add_type_qualifier 731 | add_type_qualifier_list add_type_qualifier 732 ; 733 734 add_type_qualifier: 735 T_QUAL { 736 add_qualifier($1); 737 } 738 ; 739 740 notype_member_decls: 741 notype_member_decl { 742 $$ = declarator_1_struct_union($1); 743 } 744 | notype_member_decls { 745 symtyp = FMEMBER; 746 } T_COMMA type_member_decl { 747 $$ = lnklst($1, declarator_1_struct_union($4)); 748 } 749 ; 750 751 type_member_decls: 752 type_member_decl { 753 $$ = declarator_1_struct_union($1); 754 } 755 | type_member_decls { 756 symtyp = FMEMBER; 757 } T_COMMA type_member_decl { 758 $$ = lnklst($1, declarator_1_struct_union($4)); 759 } 760 ; 761 762 notype_member_decl: 763 notype_decl 764 | notype_decl T_COLON constant_expr { /* C99 6.7.2.1 */ 765 $$ = bitfield($1, to_int_constant($3, true)); 766 } 767 | { 768 symtyp = FVFT; 769 } T_COLON constant_expr { /* C99 6.7.2.1 */ 770 $$ = bitfield(NULL, to_int_constant($3, true)); 771 } 772 ; 773 774 type_member_decl: 775 type_decl 776 | type_decl T_COLON constant_expr { 777 $$ = bitfield($1, to_int_constant($3, true)); 778 } 779 | { 780 symtyp = FVFT; 781 } T_COLON constant_expr { 782 $$ = bitfield(NULL, to_int_constant($3, true)); 783 } 784 ; 785 786 enum_spec: 787 enum enum_tag { 788 $$ = mktag($2, ENUM, false, false); 789 } 790 | enum enum_tag { 791 dcs->d_tagtyp = mktag($2, ENUM, true, false); 792 } enum_declaration { 793 $$ = complete_tag_enum(dcs->d_tagtyp, $4); 794 } 795 | enum { 796 dcs->d_tagtyp = mktag(NULL, ENUM, true, false); 797 } enum_declaration { 798 $$ = complete_tag_enum(dcs->d_tagtyp, $3); 799 } 800 | enum error { 801 symtyp = FVFT; 802 $$ = gettyp(INT); 803 } 804 ; 805 806 enum: 807 T_ENUM { 808 symtyp = FTAG; 809 begin_declaration_level(CTCONST); 810 } 811 ; 812 813 enum_tag: 814 identifier { 815 $$ = getsym($1); 816 } 817 ; 818 819 enum_declaration: 820 T_LBRACE { 821 symtyp = FVFT; 822 enumval = 0; 823 } enumerator_list enumerator_list_comma_opt T_RBRACE { 824 $$ = $3; 825 } 826 ; 827 828 enumerator_list: /* C99 6.7.2.2 */ 829 enumerator 830 | enumerator_list T_COMMA enumerator { 831 $$ = lnklst($1, $3); 832 } 833 | error { 834 $$ = NULL; 835 } 836 ; 837 838 enumerator_list_comma_opt: 839 /* empty */ 840 | T_COMMA { 841 if (sflag) { 842 /* trailing ',' prohibited in enum declaration */ 843 error(54); 844 } else { 845 /* trailing ',' prohibited in enum declaration */ 846 c99ism(54); 847 } 848 } 849 ; 850 851 enumerator: /* C99 6.7.2.2 */ 852 enumeration_constant { 853 $$ = enumeration_constant($1, enumval, true); 854 } 855 | enumeration_constant T_ASSIGN constant_expr { 856 $$ = enumeration_constant($1, to_int_constant($3, true), false); 857 } 858 ; 859 860 enumeration_constant: /* C99 6.4.4.3 */ 861 identifier { 862 $$ = getsym($1); 863 } 864 ; 865 866 867 /* 868 * For an explanation of 'notype' in the following rules, see the Bison 869 * manual, section 7.1 "Semantic Info in Token Kinds". 870 */ 871 872 notype_init_decls: 873 notype_init_decl 874 | notype_init_decls T_COMMA type_init_decl 875 ; 876 877 type_init_decls: 878 type_init_decl 879 | type_init_decls T_COMMA type_init_decl 880 ; 881 882 notype_init_decl: 883 notype_decl asm_or_symbolrename_opt { 884 cgram_declare($1, false, $2); 885 check_size($1); 886 } 887 | notype_decl asm_or_symbolrename_opt { 888 begin_initialization($1); 889 cgram_declare($1, true, $2); 890 } T_ASSIGN initializer { 891 check_size($1); 892 end_initialization(); 893 } 894 ; 895 896 type_init_decl: 897 type_decl asm_or_symbolrename_opt { 898 cgram_declare($1, false, $2); 899 check_size($1); 900 } 901 | type_decl asm_or_symbolrename_opt { 902 begin_initialization($1); 903 cgram_declare($1, true, $2); 904 } T_ASSIGN initializer { 905 check_size($1); 906 end_initialization(); 907 } 908 ; 909 910 notype_decl: 911 /* TODO: removing type_attribute_list_opt here removes another 18 conflicts */ 912 type_attribute_list_opt notype_direct_decl { 913 $$ = $2; 914 } 915 | pointer type_attribute_list_opt notype_direct_decl { 916 $$ = add_pointer($3, $1); 917 } 918 ; 919 920 type_decl: 921 /* TODO: removing type_attribute_list_opt here removes another 16 conflicts */ 922 type_attribute_list_opt type_direct_decl { 923 $$ = $2; 924 } 925 | pointer type_attribute_list_opt type_direct_decl { 926 $$ = add_pointer($3, $1); 927 } 928 ; 929 930 notype_direct_decl: 931 T_NAME { 932 $$ = declarator_name(getsym($1)); 933 } 934 | T_LPAREN type_decl T_RPAREN { 935 $$ = $2; 936 } 937 | notype_direct_decl T_LBRACK T_RBRACK { 938 $$ = add_array($1, false, 0); 939 } 940 | notype_direct_decl T_LBRACK array_size T_RBRACK { 941 $$ = add_array($1, true, to_int_constant($3, false)); 942 } 943 | notype_direct_decl param_list asm_or_symbolrename_opt { 944 $$ = add_function(symbolrename($1, $3), $2); 945 end_declaration_level(); 946 block_level--; 947 } 948 | notype_direct_decl type_attribute 949 ; 950 951 type_direct_decl: 952 identifier { 953 $$ = declarator_name(getsym($1)); 954 } 955 | T_LPAREN type_decl T_RPAREN { 956 $$ = $2; 957 } 958 | type_direct_decl T_LBRACK T_RBRACK { 959 $$ = add_array($1, false, 0); 960 } 961 | type_direct_decl T_LBRACK array_size T_RBRACK { 962 $$ = add_array($1, true, to_int_constant($3, false)); 963 } 964 | type_direct_decl param_list asm_or_symbolrename_opt { 965 $$ = add_function(symbolrename($1, $3), $2); 966 end_declaration_level(); 967 block_level--; 968 } 969 | type_direct_decl type_attribute 970 ; 971 972 /* 973 * The two distinct rules type_param_decl and notype_param_decl avoid a 974 * conflict in argument lists. A typename enclosed in parentheses is always 975 * treated as a typename, not an argument name. For example, after 976 * "typedef double a;", the declaration "f(int (a));" is interpreted as 977 * "f(int (double));", not "f(int a);". 978 */ 979 type_param_decl: 980 direct_param_decl 981 | pointer direct_param_decl { 982 $$ = add_pointer($2, $1); 983 } 984 ; 985 986 notype_param_decl: 987 direct_notype_param_decl 988 | pointer direct_notype_param_decl { 989 $$ = add_pointer($2, $1); 990 } 991 ; 992 993 direct_param_decl: 994 identifier type_attribute_list_opt { 995 $$ = declarator_name(getsym($1)); 996 } 997 | T_LPAREN notype_param_decl T_RPAREN { 998 $$ = $2; 999 } 1000 | direct_param_decl T_LBRACK T_RBRACK { 1001 $$ = add_array($1, false, 0); 1002 } 1003 | direct_param_decl T_LBRACK array_size T_RBRACK { 1004 $$ = add_array($1, true, to_int_constant($3, false)); 1005 } 1006 | direct_param_decl param_list asm_or_symbolrename_opt { 1007 $$ = add_function(symbolrename($1, $3), $2); 1008 end_declaration_level(); 1009 block_level--; 1010 } 1011 ; 1012 1013 direct_notype_param_decl: 1014 identifier /* XXX: missing type_attribute_list_opt? */ { 1015 $$ = declarator_name(getsym($1)); 1016 } 1017 | T_LPAREN notype_param_decl T_RPAREN { 1018 $$ = $2; 1019 } 1020 | direct_notype_param_decl T_LBRACK T_RBRACK { 1021 $$ = add_array($1, false, 0); 1022 } 1023 | direct_notype_param_decl T_LBRACK array_size T_RBRACK { 1024 $$ = add_array($1, true, to_int_constant($3, false)); 1025 } 1026 | direct_notype_param_decl param_list asm_or_symbolrename_opt { 1027 $$ = add_function(symbolrename($1, $3), $2); 1028 end_declaration_level(); 1029 block_level--; 1030 } 1031 ; 1032 1033 pointer: /* C99 6.7.5 */ 1034 asterisk type_qualifier_list_opt { 1035 $$ = merge_qualified_pointer($1, $2); 1036 } 1037 | asterisk type_qualifier_list_opt pointer { 1038 $$ = merge_qualified_pointer($1, $2); 1039 $$ = merge_qualified_pointer($$, $3); 1040 } 1041 ; 1042 1043 asterisk: 1044 T_ASTERISK { 1045 $$ = xcalloc(1, sizeof(*$$)); 1046 $$->p_pointer = true; 1047 } 1048 ; 1049 1050 type_qualifier_list_opt: 1051 /* empty */ { 1052 $$ = NULL; 1053 } 1054 | type_qualifier_list 1055 ; 1056 1057 type_qualifier_list: /* C99 6.7.5 */ 1058 type_qualifier 1059 | type_qualifier_list type_qualifier { 1060 $$ = merge_qualified_pointer($1, $2); 1061 } 1062 ; 1063 1064 type_qualifier: 1065 T_QUAL { 1066 $$ = xcalloc(1, sizeof(*$$)); 1067 if ($1 == CONST) { 1068 $$->p_const = true; 1069 } else if ($1 == VOLATILE) { 1070 $$->p_volatile = true; 1071 } else { 1072 lint_assert($1 == RESTRICT || $1 == THREAD); 1073 } 1074 } 1075 ; 1076 1077 align_as: /* See alignment-specifier in C11 6.7.5 */ 1078 typespec 1079 | constant_expr 1080 ; 1081 1082 param_list: 1083 id_list_lparen identifier_list T_RPAREN { 1084 $$ = $2; 1085 } 1086 | abstract_decl_param_list 1087 ; 1088 1089 id_list_lparen: 1090 T_LPAREN { 1091 block_level++; 1092 begin_declaration_level(PROTO_ARG); 1093 } 1094 ; 1095 1096 identifier_list: 1097 T_NAME { 1098 $$ = old_style_function_name(getsym($1)); 1099 } 1100 | identifier_list T_COMMA T_NAME { 1101 $$ = lnklst($1, old_style_function_name(getsym($3))); 1102 } 1103 | identifier_list error 1104 ; 1105 1106 abstract_decl_param_list: 1107 abstract_decl_lparen T_RPAREN type_attribute_opt { 1108 $$ = NULL; 1109 } 1110 | abstract_decl_lparen vararg_parameter_type_list T_RPAREN type_attribute_opt { 1111 dcs->d_proto = true; 1112 $$ = $2; 1113 } 1114 | abstract_decl_lparen error T_RPAREN type_attribute_opt { 1115 $$ = NULL; 1116 } 1117 ; 1118 1119 abstract_decl_lparen: 1120 T_LPAREN { 1121 block_level++; 1122 begin_declaration_level(PROTO_ARG); 1123 } 1124 ; 1125 1126 vararg_parameter_type_list: 1127 parameter_type_list 1128 | parameter_type_list T_COMMA T_ELLIPSIS { 1129 dcs->d_vararg = true; 1130 $$ = $1; 1131 } 1132 | T_ELLIPSIS { 1133 if (sflag) { 1134 /* ANSI C requires formal parameter before '...' */ 1135 error(84); 1136 } else if (!tflag) { 1137 /* ANSI C requires formal parameter before '...' */ 1138 warning(84); 1139 } 1140 dcs->d_vararg = true; 1141 $$ = NULL; 1142 } 1143 ; 1144 1145 parameter_type_list: 1146 parameter_declaration 1147 | parameter_type_list T_COMMA parameter_declaration { 1148 $$ = lnklst($1, $3); 1149 } 1150 ; 1151 1152 /* XXX: C99 6.7.5 defines the same name, but it looks completely different. */ 1153 parameter_declaration: 1154 clrtyp declmods deftyp { 1155 $$ = declare_argument(abstract_name(), false); 1156 } 1157 | clrtyp declaration_specifiers deftyp { 1158 $$ = declare_argument(abstract_name(), false); 1159 } 1160 | clrtyp declmods deftyp notype_param_decl { 1161 $$ = declare_argument($4, false); 1162 } 1163 | clrtyp declaration_specifiers deftyp type_param_decl { 1164 $$ = declare_argument($4, false); 1165 } 1166 | clrtyp declmods deftyp abstract_declarator { 1167 $$ = declare_argument($4, false); 1168 } 1169 | clrtyp declaration_specifiers deftyp abstract_declarator { 1170 $$ = declare_argument($4, false); 1171 } 1172 ; 1173 1174 asm_or_symbolrename_opt: /* expect only one */ 1175 /* empty */ { 1176 $$ = NULL; 1177 } 1178 | T_ASM T_LPAREN T_STRING T_RPAREN { 1179 freeyyv(&$3, T_STRING); 1180 $$ = NULL; 1181 } 1182 | T_SYMBOLRENAME T_LPAREN T_NAME T_RPAREN { 1183 $$ = $3; 1184 } 1185 ; 1186 1187 initializer: /* C99 6.7.8 "Initialization" */ 1188 expr %prec T_COMMA { 1189 init_expr($1); 1190 } 1191 | init_lbrace init_rbrace { 1192 /* XXX: Empty braces are not covered by C99 6.7.8. */ 1193 } 1194 | init_lbrace initializer_list comma_opt init_rbrace 1195 | error 1196 ; 1197 1198 initializer_list: /* C99 6.7.8 "Initialization" */ 1199 initializer_list_item 1200 | initializer_list T_COMMA initializer_list_item 1201 ; 1202 1203 initializer_list_item: 1204 designation initializer 1205 | initializer 1206 ; 1207 1208 designation: /* C99 6.7.8 "Initialization" */ 1209 designator_list T_ASSIGN 1210 | identifier T_COLON { 1211 /* GCC style struct or union member name in initializer */ 1212 gnuism(315); 1213 add_designator_member($1); 1214 } 1215 ; 1216 1217 designator_list: /* C99 6.7.8 "Initialization" */ 1218 designator 1219 | designator_list designator 1220 ; 1221 1222 designator: /* C99 6.7.8 "Initialization" */ 1223 T_LBRACK range T_RBRACK { 1224 add_designator_subscript($2); 1225 if (!Sflag) 1226 /* array initializer with des.s is a C9X feature */ 1227 warning(321); 1228 } 1229 | T_POINT identifier { 1230 if (!Sflag) 1231 /* struct or union member name in initializer is ... */ 1232 warning(313); 1233 add_designator_member($2); 1234 } 1235 ; 1236 1237 range: 1238 constant_expr { 1239 $$.lo = to_int_constant($1, true); 1240 $$.hi = $$.lo; 1241 } 1242 | constant_expr T_ELLIPSIS constant_expr { 1243 $$.lo = to_int_constant($1, true); 1244 $$.hi = to_int_constant($3, true); 1245 /* initialization with '[a...b]' is a GCC extension */ 1246 gnuism(340); 1247 } 1248 ; 1249 1250 init_lbrace: 1251 T_LBRACE { 1252 init_lbrace(); 1253 } 1254 ; 1255 1256 init_rbrace: 1257 T_RBRACE { 1258 init_rbrace(); 1259 } 1260 ; 1261 1262 type_name: /* C99 6.7.6 */ 1263 { 1264 begin_declaration_level(ABSTRACT); 1265 } abstract_declaration { 1266 end_declaration_level(); 1267 $$ = $2->s_type; 1268 } 1269 ; 1270 1271 abstract_declaration: 1272 clrtyp add_type_qualifier_list deftyp { 1273 $$ = declare_1_abstract(abstract_name()); 1274 } 1275 | noclass_declspecs deftyp { 1276 $$ = declare_1_abstract(abstract_name()); 1277 } 1278 | clrtyp add_type_qualifier_list deftyp abstract_declarator { 1279 $$ = declare_1_abstract($4); 1280 } 1281 | noclass_declspecs deftyp abstract_declarator { 1282 $$ = declare_1_abstract($3); 1283 } 1284 ; 1285 1286 abstract_declarator: /* C99 6.7.6 */ 1287 pointer { 1288 $$ = add_pointer(abstract_name(), $1); 1289 } 1290 | direct_abstract_declarator 1291 | pointer direct_abstract_declarator { 1292 $$ = add_pointer($2, $1); 1293 } 1294 | T_TYPEOF term { /* GCC extension */ 1295 $$ = mktempsym($2->tn_type); 1296 } 1297 ; 1298 1299 direct_abstract_declarator: /* C99 6.7.6 */ 1300 direct_abstract_declarator_postfix 1301 | type_attribute direct_abstract_declarator_postfix { 1302 $$ = $2; 1303 } 1304 ; 1305 1306 direct_abstract_declarator_postfix: /* C99 6.7.6 */ 1307 T_LPAREN abstract_declarator T_RPAREN { 1308 $$ = $2; 1309 } 1310 | T_LBRACK T_RBRACK { 1311 $$ = add_array(abstract_name(), false, 0); 1312 } 1313 | T_LBRACK array_size T_RBRACK { 1314 $$ = add_array(abstract_name(), true, to_int_constant($2, false)); 1315 } 1316 | direct_abstract_declarator_postfix T_LBRACK T_RBRACK { 1317 $$ = add_array($1, false, 0); 1318 } 1319 | direct_abstract_declarator_postfix 1320 T_LBRACK T_ASTERISK T_RBRACK { /* C99 */ 1321 $$ = add_array($1, false, 0); 1322 } 1323 | direct_abstract_declarator_postfix T_LBRACK array_size T_RBRACK { 1324 $$ = add_array($1, true, to_int_constant($3, false)); 1325 } 1326 | abstract_decl_param_list asm_or_symbolrename_opt { 1327 $$ = add_function(symbolrename(abstract_name(), $2), $1); 1328 end_declaration_level(); 1329 block_level--; 1330 } 1331 | direct_abstract_declarator_postfix abstract_decl_param_list 1332 asm_or_symbolrename_opt { 1333 $$ = add_function(symbolrename($1, $3), $2); 1334 end_declaration_level(); 1335 block_level--; 1336 } 1337 | direct_abstract_declarator_postfix type_attribute 1338 ; 1339 1340 array_size: 1341 type_qualifier_list_opt T_SCLASS constant_expr { 1342 /* C11 6.7.6.3p7 */ 1343 if ($2 != STATIC) 1344 yyerror("Bad attribute"); 1345 /* static array size is a C11 extension */ 1346 c11ism(343); 1347 $$ = $3; 1348 } 1349 | constant_expr 1350 ; 1351 1352 non_expr_statement: 1353 gcc_attribute T_SEMI 1354 | labeled_statement 1355 | compound_statement 1356 | selection_statement 1357 | iteration_statement 1358 | jump_statement { 1359 seen_fallthrough = false; 1360 } 1361 | asm_statement 1362 ; 1363 1364 statement: /* C99 6.8 */ 1365 expression_statement 1366 | non_expr_statement 1367 ; 1368 1369 labeled_statement: /* C99 6.8.1 */ 1370 label gcc_attribute_list_opt statement 1371 ; 1372 1373 label: 1374 T_NAME T_COLON { 1375 symtyp = FLABEL; 1376 named_label(getsym($1)); 1377 } 1378 | T_CASE constant_expr T_COLON { 1379 case_label($2); 1380 seen_fallthrough = true; 1381 } 1382 | T_CASE constant_expr T_ELLIPSIS constant_expr T_COLON { 1383 /* XXX: We don't fill all cases */ 1384 case_label($2); 1385 seen_fallthrough = true; 1386 } 1387 | T_DEFAULT T_COLON { 1388 default_label(); 1389 seen_fallthrough = true; 1390 } 1391 ; 1392 1393 compound_statement: /* C99 6.8.2 */ 1394 compound_statement_lbrace block_item_list_opt 1395 compound_statement_rbrace 1396 ; 1397 1398 compound_statement_lbrace: 1399 T_LBRACE { 1400 block_level++; 1401 mem_block_level++; 1402 begin_declaration_level(AUTO); 1403 } 1404 ; 1405 1406 compound_statement_rbrace: 1407 T_RBRACE { 1408 end_declaration_level(); 1409 freeblk(); 1410 mem_block_level--; 1411 block_level--; 1412 seen_fallthrough = false; 1413 } 1414 ; 1415 1416 block_item_list_opt: /* C99 6.8.2 */ 1417 /* empty */ 1418 | block_item_list 1419 ; 1420 1421 block_item_list: 1422 block_item 1423 | block_item_list block_item { 1424 if (!Sflag && $1 && !$2) 1425 /* declarations after statements is a C99 feature */ 1426 c99ism(327); 1427 $$ = $1 || $2; 1428 } 1429 ; 1430 1431 block_item: 1432 statement { 1433 $$ = true; 1434 restore_warning_flags(); 1435 } 1436 | declaration { 1437 $$ = false; 1438 restore_warning_flags(); 1439 } 1440 ; 1441 1442 expression_statement: /* C99 6.8.3 */ 1443 expr T_SEMI { 1444 expr($1, false, false, false, false); 1445 seen_fallthrough = false; 1446 } 1447 | T_SEMI { 1448 seen_fallthrough = false; 1449 } 1450 ; 1451 1452 selection_statement: /* C99 6.8.4 */ 1453 if_without_else { 1454 save_warning_flags(); 1455 if2(); 1456 if3(false); 1457 } 1458 | if_without_else T_ELSE { 1459 save_warning_flags(); 1460 if2(); 1461 } statement { 1462 clear_warning_flags(); 1463 if3(true); 1464 } 1465 | if_without_else T_ELSE error { 1466 clear_warning_flags(); 1467 if3(false); 1468 } 1469 | switch_expr statement { 1470 clear_warning_flags(); 1471 switch2(); 1472 } 1473 | switch_expr error { 1474 clear_warning_flags(); 1475 switch2(); 1476 } 1477 ; 1478 1479 if_without_else: /* see C99 6.8.4 */ 1480 if_expr statement 1481 | if_expr error 1482 ; 1483 1484 if_expr: /* see C99 6.8.4 */ 1485 T_IF T_LPAREN expr T_RPAREN { 1486 if1($3); 1487 clear_warning_flags(); 1488 } 1489 ; 1490 1491 switch_expr: /* see C99 6.8.4 */ 1492 T_SWITCH T_LPAREN expr T_RPAREN { 1493 switch1($3); 1494 clear_warning_flags(); 1495 } 1496 ; 1497 1498 iteration_statement: /* C99 6.8.5 */ 1499 T_WHILE T_LPAREN expr T_RPAREN { 1500 while1($3); 1501 clear_warning_flags(); 1502 } iteration_body { 1503 clear_warning_flags(); 1504 while2(); 1505 } 1506 | do statement { 1507 clear_warning_flags(); 1508 } T_WHILE T_LPAREN expr T_RPAREN T_SEMI { 1509 do2($6); 1510 seen_fallthrough = false; 1511 } 1512 | do error { 1513 clear_warning_flags(); 1514 do2(NULL); 1515 } 1516 | for_exprs iteration_body { 1517 clear_warning_flags(); 1518 for2(); 1519 end_declaration_level(); 1520 block_level--; 1521 } 1522 ; 1523 1524 iteration_body: 1525 statement 1526 | error 1527 ; 1528 1529 do: /* see C99 6.8.5 */ 1530 T_DO { 1531 do1(); 1532 } 1533 ; 1534 1535 for_start: /* see C99 6.8.5 */ 1536 T_FOR T_LPAREN { 1537 begin_declaration_level(AUTO); 1538 block_level++; 1539 } 1540 ; 1541 1542 for_exprs: /* see C99 6.8.5 */ 1543 for_start 1544 clrtyp declaration_specifiers deftyp notype_init_decls T_SEMI 1545 expr_opt T_SEMI 1546 expr_opt T_RPAREN { 1547 /* variable declaration in for loop */ 1548 c99ism(325); 1549 for1(NULL, $7, $9); 1550 clear_warning_flags(); 1551 } 1552 | for_start expr_opt T_SEMI expr_opt T_SEMI expr_opt T_RPAREN { 1553 for1($2, $4, $6); 1554 clear_warning_flags(); 1555 } 1556 ; 1557 1558 jump_statement: /* C99 6.8.6 */ 1559 goto identifier T_SEMI { 1560 do_goto(getsym($2)); 1561 } 1562 | goto error T_SEMI { 1563 symtyp = FVFT; 1564 } 1565 | T_CONTINUE T_SEMI { 1566 do_continue(); 1567 } 1568 | T_BREAK T_SEMI { 1569 do_break(); 1570 } 1571 | T_RETURN T_SEMI { 1572 do_return(NULL); 1573 } 1574 | T_RETURN expr T_SEMI { 1575 do_return($2); 1576 } 1577 ; 1578 1579 goto: 1580 T_GOTO { 1581 symtyp = FLABEL; 1582 } 1583 ; 1584 1585 asm_statement: 1586 T_ASM T_LPAREN read_until_rparen T_SEMI { 1587 setasm(); 1588 } 1589 | T_ASM T_QUAL T_LPAREN read_until_rparen T_SEMI { 1590 setasm(); 1591 } 1592 | T_ASM error 1593 ; 1594 1595 read_until_rparen: 1596 /* empty */ { 1597 ignore_up_to_rparen(); 1598 } 1599 ; 1600 1601 constant_expr_list_opt: 1602 /* empty */ 1603 | constant_expr_list 1604 ; 1605 1606 constant_expr_list: 1607 constant_expr 1608 | constant_expr_list T_COMMA constant_expr 1609 ; 1610 1611 constant_expr: /* C99 6.6 */ 1612 expr %prec T_ASSIGN 1613 ; 1614 1615 expr_opt: 1616 /* empty */ { 1617 $$ = NULL; 1618 } 1619 | expr 1620 ; 1621 1622 expr: /* C99 6.5 */ 1623 expr T_ASTERISK expr { 1624 $$ = build(MULT, $1, $3); 1625 } 1626 | expr T_MULTIPLICATIVE expr { 1627 $$ = build($2, $1, $3); 1628 } 1629 | expr T_ADDITIVE expr { 1630 $$ = build($2, $1, $3); 1631 } 1632 | expr T_SHIFT expr { 1633 $$ = build($2, $1, $3); 1634 } 1635 | expr T_RELATIONAL expr { 1636 $$ = build($2, $1, $3); 1637 } 1638 | expr T_EQUALITY expr { 1639 $$ = build($2, $1, $3); 1640 } 1641 | expr T_AMPER expr { 1642 $$ = build(BITAND, $1, $3); 1643 } 1644 | expr T_BITXOR expr { 1645 $$ = build(BITXOR, $1, $3); 1646 } 1647 | expr T_BITOR expr { 1648 $$ = build(BITOR, $1, $3); 1649 } 1650 | expr T_LOGAND expr { 1651 $$ = build(LOGAND, $1, $3); 1652 } 1653 | expr T_LOGOR expr { 1654 $$ = build(LOGOR, $1, $3); 1655 } 1656 | expr T_QUEST expr T_COLON expr { 1657 $$ = build(QUEST, $1, build(COLON, $3, $5)); 1658 } 1659 | expr T_ASSIGN expr { 1660 $$ = build(ASSIGN, $1, $3); 1661 } 1662 | expr T_OPASSIGN expr { 1663 $$ = build($2, $1, $3); 1664 } 1665 | expr T_COMMA expr { 1666 $$ = build(COMMA, $1, $3); 1667 } 1668 | term 1669 | generic_selection 1670 ; 1671 1672 assignment_expression: /* C99 6.5.16 */ 1673 expr %prec T_ASSIGN 1674 ; 1675 1676 term: /* see C99 6.5.1 */ 1677 T_NAME { 1678 /* XXX really necessary? */ 1679 if (yychar < 0) 1680 yychar = yylex(); 1681 $$ = new_name_node(getsym($1), yychar); 1682 } 1683 | string { 1684 $$ = new_string_node($1); 1685 } 1686 | T_CON { 1687 $$ = expr_new_constant(gettyp($1->v_tspec), $1); 1688 } 1689 | T_LPAREN expr T_RPAREN { 1690 if ($2 != NULL) 1691 $2->tn_parenthesized = true; 1692 $$ = $2; 1693 } 1694 | T_LPAREN compound_statement_lbrace gcc_statement_expr_list { 1695 block_level--; 1696 mem_block_level--; 1697 begin_initialization(mktempsym(dup_type($3->tn_type))); 1698 mem_block_level++; 1699 block_level++; 1700 /* ({ }) is a GCC extension */ 1701 gnuism(320); 1702 } compound_statement_rbrace T_RPAREN { 1703 $$ = new_name_node(*current_initsym(), 0); 1704 end_initialization(); 1705 } 1706 | term T_INCDEC { 1707 $$ = build($2 == INC ? INCAFT : DECAFT, $1, NULL); 1708 } 1709 | T_INCDEC term { 1710 $$ = build($1 == INC ? INCBEF : DECBEF, $2, NULL); 1711 } 1712 | T_ASTERISK term { 1713 $$ = build(INDIR, $2, NULL); 1714 } 1715 | T_AMPER term { 1716 $$ = build(ADDR, $2, NULL); 1717 } 1718 | T_UNARY term { 1719 $$ = build($1, $2, NULL); 1720 } 1721 | T_ADDITIVE term { 1722 if (tflag && $1 == PLUS) { 1723 /* unary + is illegal in traditional C */ 1724 warning(100); 1725 } 1726 $$ = build($1 == PLUS ? UPLUS : UMINUS, $2, NULL); 1727 } 1728 | term T_LBRACK expr T_RBRACK { 1729 $$ = build(INDIR, build(PLUS, $1, $3), NULL); 1730 } 1731 | term T_LPAREN T_RPAREN { 1732 $$ = new_function_call_node($1, NULL); 1733 } 1734 | term T_LPAREN func_arg_list T_RPAREN { 1735 $$ = new_function_call_node($1, $3); 1736 } 1737 | term point_or_arrow T_NAME { 1738 if ($1 != NULL) { 1739 sym_t *msym; 1740 /* 1741 * XXX struct_or_union_member should be integrated 1742 * in build() 1743 */ 1744 if ($2 == ARROW) { 1745 /* 1746 * must do this before struct_or_union_member 1747 * is called 1748 */ 1749 $1 = cconv($1); 1750 } 1751 msym = struct_or_union_member($1, $2, getsym($3)); 1752 $$ = build($2, $1, new_name_node(msym, 0)); 1753 } else { 1754 $$ = NULL; 1755 } 1756 } 1757 | T_REAL term { 1758 $$ = build(REAL, $2, NULL); 1759 } 1760 | T_IMAG term { 1761 $$ = build(IMAG, $2, NULL); 1762 } 1763 | T_EXTENSION term { 1764 $$ = $2; 1765 } 1766 | T_BUILTIN_OFFSETOF T_LPAREN type_name T_COMMA identifier T_RPAREN { 1767 symtyp = FMEMBER; 1768 $$ = build_offsetof($3, getsym($5)); 1769 } 1770 | T_SIZEOF term { 1771 $$ = $2 == NULL ? NULL : build_sizeof($2->tn_type); 1772 if ($$ != NULL) 1773 check_expr_misc($2, false, false, false, false, false, true); 1774 } 1775 | T_SIZEOF T_LPAREN type_name T_RPAREN %prec T_SIZEOF { 1776 $$ = build_sizeof($3); 1777 } 1778 | T_ALIGNOF T_LPAREN type_name T_RPAREN { 1779 $$ = build_alignof($3); 1780 } 1781 | T_LPAREN type_name T_RPAREN term %prec T_UNARY { 1782 $$ = cast($4, $2); 1783 } 1784 | T_LPAREN type_name T_RPAREN { /* C99 6.5.2.5 "Compound literals" */ 1785 sym_t *tmp = mktempsym($2); 1786 begin_initialization(tmp); 1787 cgram_declare(tmp, true, NULL); 1788 } init_lbrace initializer_list comma_opt init_rbrace { 1789 if (!Sflag) 1790 /* compound literals are a C9X/GCC extension */ 1791 gnuism(319); 1792 $$ = new_name_node(*current_initsym(), 0); 1793 end_initialization(); 1794 } 1795 ; 1796 1797 generic_selection: /* C11 6.5.1.1 */ 1798 T_GENERIC T_LPAREN assignment_expression T_COMMA 1799 generic_assoc_list T_RPAREN { 1800 /* generic selection requires C11 or later */ 1801 c11ism(345); 1802 $$ = build_generic_selection($3, $5); 1803 } 1804 ; 1805 1806 generic_assoc_list: /* C11 6.5.1.1 */ 1807 generic_association 1808 | generic_assoc_list T_COMMA generic_association { 1809 $3->ga_prev = $1; 1810 $$ = $3; 1811 } 1812 ; 1813 1814 generic_association: /* C11 6.5.1.1 */ 1815 type_name T_COLON assignment_expression { 1816 $$ = getblk(sizeof(*$$)); 1817 $$->ga_arg = $1; 1818 $$->ga_result = $3; 1819 } 1820 | T_DEFAULT T_COLON assignment_expression { 1821 $$ = getblk(sizeof(*$$)); 1822 $$->ga_arg = NULL; 1823 $$->ga_result = $3; 1824 } 1825 ; 1826 1827 /* 1828 * The inner part of a GCC statement-expression of the form ({ ... }). 1829 * 1830 * https://gcc.gnu.org/onlinedocs/gcc/Statement-Exprs.html 1831 */ 1832 gcc_statement_expr_list: 1833 gcc_statement_expr_item 1834 | gcc_statement_expr_list gcc_statement_expr_item { 1835 $$ = $2; 1836 } 1837 ; 1838 1839 gcc_statement_expr_item: 1840 declaration { 1841 clear_warning_flags(); 1842 $$ = NULL; 1843 } 1844 | non_expr_statement { 1845 $$ = expr_zalloc_tnode(); 1846 $$->tn_type = gettyp(VOID); 1847 } 1848 | expr T_SEMI { 1849 if ($1 == NULL) { /* in case of syntax errors */ 1850 $$ = expr_zalloc_tnode(); 1851 $$->tn_type = gettyp(VOID); 1852 } else { 1853 /* XXX: do that only on the last name */ 1854 if ($1->tn_op == NAME) 1855 $1->tn_sym->s_used = true; 1856 $$ = $1; 1857 expr($1, false, false, false, false); 1858 seen_fallthrough = false; 1859 } 1860 } 1861 ; 1862 1863 string: 1864 T_STRING 1865 | T_STRING string2 { 1866 $$ = cat_strings($1, $2); 1867 } 1868 ; 1869 1870 string2: 1871 T_STRING { 1872 if (tflag) { 1873 /* concatenated strings are illegal in traditional C */ 1874 warning(219); 1875 } 1876 $$ = $1; 1877 } 1878 | string2 T_STRING { 1879 $$ = cat_strings($1, $2); 1880 } 1881 ; 1882 1883 func_arg_list: 1884 expr %prec T_COMMA { 1885 $$ = new_function_argument_node(NULL, $1); 1886 } 1887 | func_arg_list T_COMMA expr { 1888 $$ = new_function_argument_node($1, $3); 1889 } 1890 ; 1891 1892 point_or_arrow: 1893 T_POINT { 1894 symtyp = FMEMBER; 1895 $$ = POINT; 1896 } 1897 | T_ARROW { 1898 symtyp = FMEMBER; 1899 $$ = ARROW; 1900 } 1901 ; 1902 1903 identifier: /* C99 6.4.2.1 */ 1904 T_NAME { 1905 $$ = $1; 1906 cgram_debug("name '%s'", $$->sb_name); 1907 } 1908 | T_TYPENAME { 1909 $$ = $1; 1910 cgram_debug("typename '%s'", $$->sb_name); 1911 } 1912 ; 1913 1914 comma_opt: 1915 /* empty */ 1916 | T_COMMA 1917 ; 1918 1919 /* GCC extensions */ 1920 1921 type_attribute_list_opt: 1922 /* empty */ 1923 | type_attribute_list 1924 ; 1925 1926 type_attribute_list: 1927 type_attribute 1928 | type_attribute_list type_attribute 1929 ; 1930 1931 type_attribute_opt: 1932 /* empty */ 1933 | type_attribute 1934 ; 1935 1936 type_attribute: 1937 gcc_attribute 1938 | T_ALIGNAS T_LPAREN align_as T_RPAREN 1939 | T_PACKED { 1940 addpacked(); 1941 } 1942 | T_NORETURN 1943 ; 1944 1945 gcc_attribute_list_opt: 1946 /* empty */ 1947 | gcc_attribute_list 1948 ; 1949 1950 gcc_attribute_list: 1951 gcc_attribute 1952 | gcc_attribute_list gcc_attribute 1953 ; 1954 1955 /* https://gcc.gnu.org/onlinedocs/gcc/Attribute-Syntax.html */ 1956 gcc_attribute: 1957 T_ATTRIBUTE T_LPAREN T_LPAREN { 1958 attron = true; 1959 } gcc_attribute_spec_list { 1960 attron = false; 1961 } T_RPAREN T_RPAREN 1962 ; 1963 1964 gcc_attribute_spec_list: 1965 gcc_attribute_spec 1966 | gcc_attribute_spec_list T_COMMA gcc_attribute_spec 1967 ; 1968 1969 gcc_attribute_spec: 1970 /* empty */ 1971 | T_AT_ALWAYS_INLINE 1972 | T_AT_ALIAS T_LPAREN string T_RPAREN 1973 | T_AT_ALIGNED T_LPAREN constant_expr T_RPAREN 1974 | T_AT_ALIGNED 1975 | T_AT_ALLOC_SIZE T_LPAREN constant_expr T_COMMA constant_expr T_RPAREN 1976 | T_AT_ALLOC_SIZE T_LPAREN constant_expr T_RPAREN 1977 | T_AT_BOUNDED T_LPAREN gcc_attribute_bounded 1978 T_COMMA constant_expr T_COMMA constant_expr T_RPAREN 1979 | T_AT_COLD 1980 | T_AT_COMMON 1981 | T_AT_CONSTRUCTOR T_LPAREN constant_expr T_RPAREN 1982 | T_AT_CONSTRUCTOR 1983 | T_AT_DEPRECATED T_LPAREN string T_RPAREN 1984 | T_AT_DEPRECATED 1985 | T_AT_DESTRUCTOR T_LPAREN constant_expr T_RPAREN 1986 | T_AT_DESTRUCTOR 1987 | T_AT_FALLTHROUGH { 1988 fallthru(1); 1989 } 1990 | T_AT_FORMAT T_LPAREN gcc_attribute_format T_COMMA 1991 constant_expr T_COMMA constant_expr T_RPAREN 1992 | T_AT_FORMAT_ARG T_LPAREN constant_expr T_RPAREN 1993 | T_AT_GNU_INLINE 1994 | T_AT_MALLOC 1995 | T_AT_MAY_ALIAS 1996 | T_AT_MODE T_LPAREN T_NAME T_RPAREN 1997 | T_AT_NOINLINE 1998 | T_AT_NONNULL T_LPAREN constant_expr_list_opt T_RPAREN 1999 | T_AT_NONNULL 2000 | T_AT_NONSTRING 2001 | T_AT_NORETURN 2002 | T_AT_NOTHROW 2003 | T_AT_NO_INSTRUMENT_FUNCTION 2004 | T_AT_OPTIMIZE T_LPAREN string T_RPAREN 2005 | T_AT_PACKED { 2006 addpacked(); 2007 } 2008 | T_AT_PCS T_LPAREN string T_RPAREN 2009 | T_AT_PURE 2010 | T_AT_RETURNS_TWICE 2011 | T_AT_SECTION T_LPAREN string T_RPAREN 2012 | T_AT_SENTINEL T_LPAREN constant_expr T_RPAREN 2013 | T_AT_SENTINEL 2014 | T_AT_TLS_MODEL T_LPAREN string T_RPAREN 2015 | T_AT_TUNION 2016 | T_AT_UNUSED { 2017 add_attr_used(); 2018 } 2019 | T_AT_USED { 2020 add_attr_used(); 2021 } 2022 | T_AT_VISIBILITY T_LPAREN constant_expr T_RPAREN 2023 | T_AT_WARN_UNUSED_RESULT 2024 | T_AT_WEAK 2025 | T_QUAL { 2026 if ($1 != CONST) 2027 yyerror("Bad attribute"); 2028 } 2029 ; 2030 2031 gcc_attribute_bounded: 2032 T_AT_MINBYTES 2033 | T_AT_STRING 2034 | T_AT_BUFFER 2035 ; 2036 2037 gcc_attribute_format: 2038 T_AT_FORMAT_GNU_PRINTF 2039 | T_AT_FORMAT_PRINTF 2040 | T_AT_FORMAT_SCANF 2041 | T_AT_FORMAT_STRFMON 2042 | T_AT_FORMAT_STRFTIME 2043 | T_AT_FORMAT_SYSLOG 2044 ; 2045 2046 %% 2047 2048 /* ARGSUSED */ 2049 int 2050 yyerror(const char *msg) 2051 { 2052 /* syntax error '%s' */ 2053 error(249, yytext); 2054 if (++sytxerr >= 5) 2055 norecover(); 2056 return 0; 2057 } 2058 2059 static void 2060 cgram_declare(sym_t *decl, bool initflg, sbuf_t *renaming) 2061 { 2062 declare(decl, initflg, renaming); 2063 if (renaming != NULL) 2064 freeyyv(&renaming, T_NAME); 2065 } 2066 2067 /* 2068 * Discard all input tokens up to and including the next 2069 * unmatched right paren 2070 */ 2071 static void 2072 ignore_up_to_rparen(void) 2073 { 2074 int level; 2075 2076 if (yychar < 0) 2077 yychar = yylex(); 2078 freeyyv(&yylval, yychar); 2079 2080 level = 1; 2081 while (yychar != T_RPAREN || --level > 0) { 2082 if (yychar == T_LPAREN) { 2083 level++; 2084 } else if (yychar <= 0) { 2085 break; 2086 } 2087 freeyyv(&yylval, yychar = yylex()); 2088 } 2089 2090 yyclearin; 2091 } 2092 2093 static sym_t * 2094 symbolrename(sym_t *s, sbuf_t *sb) 2095 { 2096 if (sb != NULL) 2097 s->s_rename = sb->sb_name; 2098 return s; 2099 } 2100
Indexes created Fri Oct 03 02:09:57 GMT 2025