cgram.y revision 1.284
1 %{ 2 /* $NetBSD: cgram.y,v 1.284 2021/07/10 09:48:41 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 1.284 2021/07/10 09:48:41 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> 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_semi 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> direct_abstract_declarator_postfix 323 %type <y_sym> vararg_parameter_type_list 324 %type <y_sym> parameter_type_list 325 %type <y_sym> parameter_declaration 326 %type <y_tnode> expr 327 %type <y_tnode> assignment_expression 328 %type <y_tnode> gcc_statement_expr_list 329 %type <y_tnode> gcc_statement_expr_item 330 %type <y_tnode> term 331 %type <y_tnode> generic_selection 332 %type <y_tnode> func_arg_list 333 %type <y_op> point_or_arrow 334 %type <y_type> type_name 335 %type <y_sym> abstract_declaration 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 program: 349 /* empty */ { 350 if (sflag) { 351 /* empty translation unit */ 352 error(272); 353 } else if (!tflag) { 354 /* empty translation unit */ 355 warning(272); 356 } 357 } 358 | translation_unit 359 ; 360 361 translation_unit: /* C99 6.9 */ 362 external_declaration 363 | translation_unit external_declaration 364 ; 365 366 external_declaration: /* C99 6.9 */ 367 asm_statement 368 | function_definition { 369 global_clean_up_decl(false); 370 clear_warning_flags(); 371 } 372 | top_level_declaration { 373 global_clean_up_decl(false); 374 clear_warning_flags(); 375 } 376 ; 377 378 /* 379 * On the top level, lint allows several forms of declarations that it doesn't 380 * allow in functions. For example, a single ';' is an empty declaration and 381 * is supported by some compilers, but in a function it would be an empty 382 * statement, not a declaration. This makes a difference in C90 mode, where 383 * a statement must not be followed by a declaration. 384 * 385 * See 'declaration' for all other declarations. 386 */ 387 top_level_declaration: /* C99 6.9 calls this 'declaration' */ 388 T_SEMI { 389 if (sflag) { 390 /* empty declaration */ 391 error(0); 392 } else if (!tflag) { 393 /* empty declaration */ 394 warning(0); 395 } 396 } 397 | clrtyp deftyp notype_init_decls T_SEMI { 398 if (sflag) { 399 /* old style declaration; add 'int' */ 400 error(1); 401 } else if (!tflag) { 402 /* old style declaration; add 'int' */ 403 warning(1); 404 } 405 } 406 | declaration_noerror 407 | error T_SEMI { 408 global_clean_up(); 409 } 410 | error T_RBRACE { 411 global_clean_up(); 412 } 413 ; 414 415 function_definition: /* C99 6.9.1 */ 416 func_decl { 417 if ($1->s_type->t_tspec != FUNC) { 418 /* syntax error '%s' */ 419 error(249, yytext); 420 YYERROR; 421 } 422 if ($1->s_type->t_typedef) { 423 /* ()-less function definition */ 424 error(64); 425 YYERROR; 426 } 427 funcdef($1); 428 block_level++; 429 begin_declaration_level(ARG); 430 if (lwarn == LWARN_NONE) 431 $1->s_used = true; 432 } arg_declaration_list_opt { 433 end_declaration_level(); 434 block_level--; 435 check_func_lint_directives(); 436 check_func_old_style_arguments(); 437 begin_control_statement(CS_FUNCTION_BODY); 438 } compound_statement { 439 funcend(); 440 end_control_statement(CS_FUNCTION_BODY); 441 } 442 ; 443 444 func_decl: 445 clrtyp deftyp notype_decl { 446 $$ = $3; 447 } 448 | declmods deftyp notype_decl { 449 $$ = $3; 450 } 451 | declaration_specifiers deftyp type_decl { 452 $$ = $3; 453 } 454 ; 455 456 arg_declaration_list_opt: /* C99 6.9.1p13 example 1 */ 457 /* empty */ 458 | arg_declaration_list 459 ; 460 461 arg_declaration_list: /* C99 6.9.1p13 example 1 */ 462 arg_declaration 463 | arg_declaration_list arg_declaration 464 /* XXX or better "arg_declaration error" ? */ 465 | error 466 ; 467 468 /* 469 * "arg_declaration" is separated from "declaration" because it 470 * needs other error handling. 471 */ 472 arg_declaration: 473 declmods deftyp T_SEMI { 474 /* empty declaration */ 475 warning(2); 476 } 477 | declmods deftyp notype_init_decls T_SEMI 478 | declaration_specifiers deftyp T_SEMI { 479 if (!dcs->d_nonempty_decl) { 480 /* empty declaration */ 481 warning(2); 482 } else { 483 /* '%s' declared in argument declaration list */ 484 warning(3, type_name(dcs->d_type)); 485 } 486 } 487 | declaration_specifiers deftyp type_init_decls T_SEMI { 488 if (dcs->d_nonempty_decl) { 489 /* '%s' declared in argument declaration list */ 490 warning(3, type_name(dcs->d_type)); 491 } 492 } 493 | declmods error 494 | declaration_specifiers error 495 ; 496 497 declaration: /* C99 6.7 */ 498 declaration_noerror 499 | error T_SEMI 500 ; 501 502 declaration_noerror: /* see C99 6.7 'declaration' */ 503 declmods deftyp T_SEMI { 504 if (dcs->d_scl == TYPEDEF) { 505 /* typedef declares no type name */ 506 warning(72); 507 } else { 508 /* empty declaration */ 509 warning(2); 510 } 511 } 512 | declmods deftyp notype_init_decls T_SEMI 513 | declaration_specifiers deftyp T_SEMI { 514 if (dcs->d_scl == TYPEDEF) { 515 /* typedef declares no type name */ 516 warning(72); 517 } else if (!dcs->d_nonempty_decl) { 518 /* empty declaration */ 519 warning(2); 520 } 521 } 522 | declaration_specifiers deftyp type_init_decls T_SEMI 523 ; 524 525 clrtyp: 526 /* empty */ { 527 clrtyp(); 528 } 529 ; 530 531 deftyp: 532 /* empty */ { 533 deftyp(); 534 } 535 ; 536 537 declaration_specifiers: /* C99 6.7 */ 538 clrtyp_typespec { 539 add_type($1); 540 } 541 | declmods typespec { 542 add_type($2); 543 } 544 | type_attribute declaration_specifiers 545 | declaration_specifiers declmod 546 | declaration_specifiers notype_typespec { 547 add_type($2); 548 } 549 ; 550 551 declmods: 552 clrtyp qualifier_or_storage_class 553 | declmods declmod 554 ; 555 556 declmod: 557 qualifier_or_storage_class 558 | type_attribute 559 ; 560 561 qualifier_or_storage_class: 562 T_QUAL { 563 add_qualifier($1); 564 } 565 | T_SCLASS { 566 add_storage_class($1); 567 } 568 ; 569 570 clrtyp_typespec: 571 clrtyp notype_typespec { 572 $$ = $2; 573 } 574 | T_TYPENAME clrtyp { 575 $$ = getsym($1)->s_type; 576 } 577 ; 578 579 typespec: 580 notype_typespec 581 | T_TYPENAME { 582 $$ = getsym($1)->s_type; 583 } 584 ; 585 586 notype_typespec: 587 T_TYPE { 588 $$ = gettyp($1); 589 } 590 | T_TYPEOF term { 591 $$ = $2->tn_type; 592 } 593 | struct_spec { 594 end_declaration_level(); 595 $$ = $1; 596 } 597 | enum_spec { 598 end_declaration_level(); 599 $$ = $1; 600 } 601 ; 602 603 struct_spec: 604 struct struct_tag { 605 /* 606 * STDC requires that "struct a;" always introduces 607 * a new tag if "a" is not declared at current level 608 * 609 * yychar is valid because otherwise the parser would not 610 * have been able to decide if it must shift or reduce 611 */ 612 $$ = mktag($2, $1, false, yychar == T_SEMI); 613 } 614 | struct struct_tag { 615 dcs->d_tagtyp = mktag($2, $1, true, false); 616 } struct_declaration { 617 $$ = complete_tag_struct_or_union(dcs->d_tagtyp, $4); 618 } 619 | struct { 620 dcs->d_tagtyp = mktag(NULL, $1, true, false); 621 } struct_declaration { 622 $$ = complete_tag_struct_or_union(dcs->d_tagtyp, $3); 623 } 624 | struct error { 625 symtyp = FVFT; 626 $$ = gettyp(INT); 627 } 628 ; 629 630 struct: 631 T_STRUCT_OR_UNION { 632 symtyp = FTAG; 633 begin_declaration_level($1 == STRUCT ? MOS : MOU); 634 dcs->d_offset = 0; 635 dcs->d_sou_align_in_bits = CHAR_SIZE; 636 } type_attribute_list_opt 637 ; 638 639 struct_tag: 640 identifier { 641 $$ = getsym($1); 642 } 643 ; 644 645 struct_declaration: 646 T_LBRACE { 647 symtyp = FVFT; 648 } member_declaration_list_semi T_RBRACE { 649 $$ = $3; 650 } 651 ; 652 653 member_declaration_list_semi: 654 /* empty */ { 655 $$ = NULL; 656 } 657 | member_declaration_list T_SEMI 658 | member_declaration_list { 659 if (sflag) { 660 /* syntax req. ';' after last struct/union member */ 661 error(66); 662 } else { 663 /* syntax req. ';' after last struct/union member */ 664 warning(66); 665 } 666 $$ = $1; 667 } 668 ; 669 670 member_declaration_list: 671 member_declaration 672 | member_declaration_list T_SEMI member_declaration { 673 $$ = lnklst($1, $3); 674 } 675 ; 676 677 member_declaration: 678 noclass_declmods deftyp { 679 /* too late, i know, but getsym() compensates it */ 680 symtyp = FMEMBER; 681 } notype_member_decls type_attribute_opt { 682 symtyp = FVFT; 683 $$ = $4; 684 } 685 | noclass_declspecs deftyp { 686 symtyp = FMEMBER; 687 } type_member_decls type_attribute_opt { 688 symtyp = FVFT; 689 $$ = $4; 690 } 691 | noclass_declmods deftyp type_attribute_opt { 692 symtyp = FVFT; 693 /* struct or union member must be named */ 694 if (!Sflag) 695 /* anonymous struct/union members is a C9X feature */ 696 warning(49); 697 /* add all the members of the anonymous struct/union */ 698 lint_assert(is_struct_or_union(dcs->d_type->t_tspec)); 699 $$ = dcs->d_type->t_str->sou_first_member; 700 anonymize($$); 701 } 702 | noclass_declspecs deftyp type_attribute_opt { 703 symtyp = FVFT; 704 /* struct or union member must be named */ 705 if (!Sflag) 706 /* anonymous struct/union members is a C9X feature */ 707 warning(49); 708 if (is_struct_or_union(dcs->d_type->t_tspec)) { 709 $$ = dcs->d_type->t_str->sou_first_member; 710 /* add all the members of the anonymous struct/union */ 711 anonymize($$); 712 } else { 713 /* syntax error '%s' */ 714 error(249, "unnamed member"); 715 $$ = NULL; 716 } 717 } 718 | error { 719 symtyp = FVFT; 720 $$ = NULL; 721 } 722 ; 723 724 noclass_declspecs: 725 noclass_declspecs_postfix 726 | type_attribute noclass_declspecs_postfix 727 ; 728 729 noclass_declspecs_postfix: 730 clrtyp_typespec { 731 add_type($1); 732 } 733 | noclass_declmods typespec { 734 add_type($2); 735 } 736 | noclass_declspecs_postfix T_QUAL { 737 add_qualifier($2); 738 } 739 | noclass_declspecs_postfix notype_typespec { 740 add_type($2); 741 } 742 | noclass_declspecs_postfix type_attribute 743 ; 744 745 noclass_declmods: 746 clrtyp T_QUAL { 747 add_qualifier($2); 748 } 749 | noclass_declmods T_QUAL { 750 add_qualifier($2); 751 } 752 ; 753 754 notype_member_decls: 755 notype_member_decl { 756 $$ = declarator_1_struct_union($1); 757 } 758 | notype_member_decls { 759 symtyp = FMEMBER; 760 } T_COMMA type_member_decl { 761 $$ = lnklst($1, declarator_1_struct_union($4)); 762 } 763 ; 764 765 type_member_decls: 766 type_member_decl { 767 $$ = declarator_1_struct_union($1); 768 } 769 | type_member_decls { 770 symtyp = FMEMBER; 771 } T_COMMA type_member_decl { 772 $$ = lnklst($1, declarator_1_struct_union($4)); 773 } 774 ; 775 776 notype_member_decl: 777 notype_decl 778 | notype_decl T_COLON constant_expr { /* C99 6.7.2.1 */ 779 $$ = bitfield($1, to_int_constant($3, true)); 780 } 781 | { 782 symtyp = FVFT; 783 } T_COLON constant_expr { /* C99 6.7.2.1 */ 784 $$ = bitfield(NULL, to_int_constant($3, true)); 785 } 786 ; 787 788 type_member_decl: 789 type_decl 790 | type_decl T_COLON constant_expr { 791 $$ = bitfield($1, to_int_constant($3, true)); 792 } 793 | { 794 symtyp = FVFT; 795 } T_COLON constant_expr { 796 $$ = bitfield(NULL, to_int_constant($3, true)); 797 } 798 ; 799 800 enum_spec: 801 enum enum_tag { 802 $$ = mktag($2, ENUM, false, false); 803 } 804 | enum enum_tag { 805 dcs->d_tagtyp = mktag($2, ENUM, true, false); 806 } enum_declaration { 807 $$ = complete_tag_enum(dcs->d_tagtyp, $4); 808 } 809 | enum { 810 dcs->d_tagtyp = mktag(NULL, ENUM, true, false); 811 } enum_declaration { 812 $$ = complete_tag_enum(dcs->d_tagtyp, $3); 813 } 814 | enum error { 815 symtyp = FVFT; 816 $$ = gettyp(INT); 817 } 818 ; 819 820 enum: 821 T_ENUM { 822 symtyp = FTAG; 823 begin_declaration_level(CTCONST); 824 } 825 ; 826 827 enum_tag: 828 identifier { 829 $$ = getsym($1); 830 } 831 ; 832 833 enum_declaration: 834 T_LBRACE { 835 symtyp = FVFT; 836 enumval = 0; 837 } enumerator_list enumerator_list_comma_opt T_RBRACE { 838 $$ = $3; 839 } 840 ; 841 842 enumerator_list: /* C99 6.7.2.2 */ 843 enumerator 844 | enumerator_list T_COMMA enumerator { 845 $$ = lnklst($1, $3); 846 } 847 | error { 848 $$ = NULL; 849 } 850 ; 851 852 enumerator_list_comma_opt: 853 /* empty */ 854 | T_COMMA { 855 if (sflag) { 856 /* trailing ',' prohibited in enum declaration */ 857 error(54); 858 } else { 859 /* trailing ',' prohibited in enum declaration */ 860 c99ism(54); 861 } 862 } 863 ; 864 865 enumerator: /* C99 6.7.2.2 */ 866 enumeration_constant { 867 $$ = enumeration_constant($1, enumval, true); 868 } 869 | enumeration_constant T_ASSIGN constant_expr { 870 $$ = enumeration_constant($1, to_int_constant($3, true), false); 871 } 872 ; 873 874 enumeration_constant: /* C99 6.4.4.3 */ 875 identifier { 876 $$ = getsym($1); 877 } 878 ; 879 880 881 /* 882 * For an explanation of 'notype' in the following rules, see the Bison 883 * manual, section 7.1 "Semantic Info in Token Kinds". 884 */ 885 886 notype_init_decls: 887 notype_init_decl 888 | notype_init_decls T_COMMA type_init_decl 889 ; 890 891 type_init_decls: 892 type_init_decl 893 | type_init_decls T_COMMA type_init_decl 894 ; 895 896 notype_init_decl: 897 notype_decl asm_or_symbolrename_opt { 898 cgram_declare($1, false, $2); 899 check_size($1); 900 } 901 | notype_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 type_init_decl: 911 type_decl asm_or_symbolrename_opt { 912 cgram_declare($1, false, $2); 913 check_size($1); 914 } 915 | type_decl asm_or_symbolrename_opt { 916 begin_initialization($1); 917 cgram_declare($1, true, $2); 918 } T_ASSIGN initializer { 919 check_size($1); 920 end_initialization(); 921 } 922 ; 923 924 notype_decl: 925 /* TODO: removing type_attribute_list_opt here removes another 18 conflicts */ 926 type_attribute_list_opt notype_direct_decl { 927 $$ = $2; 928 } 929 | pointer type_attribute_list_opt notype_direct_decl { 930 $$ = add_pointer($3, $1); 931 } 932 ; 933 934 type_decl: 935 /* TODO: removing type_attribute_list_opt here removes another 16 conflicts */ 936 type_attribute_list_opt type_direct_decl { 937 $$ = $2; 938 } 939 | pointer type_attribute_list_opt type_direct_decl { 940 $$ = add_pointer($3, $1); 941 } 942 ; 943 944 notype_direct_decl: 945 T_NAME { 946 $$ = declarator_name(getsym($1)); 947 } 948 | T_LPAREN type_decl T_RPAREN { 949 $$ = $2; 950 } 951 | notype_direct_decl T_LBRACK T_RBRACK { 952 $$ = add_array($1, false, 0); 953 } 954 | notype_direct_decl T_LBRACK array_size T_RBRACK { 955 $$ = add_array($1, true, to_int_constant($3, false)); 956 } 957 | notype_direct_decl param_list asm_or_symbolrename_opt { 958 $$ = add_function(symbolrename($1, $3), $2); 959 end_declaration_level(); 960 block_level--; 961 } 962 | notype_direct_decl type_attribute 963 ; 964 965 type_direct_decl: 966 identifier { 967 $$ = declarator_name(getsym($1)); 968 } 969 | T_LPAREN type_decl T_RPAREN { 970 $$ = $2; 971 } 972 | type_direct_decl T_LBRACK T_RBRACK { 973 $$ = add_array($1, false, 0); 974 } 975 | type_direct_decl T_LBRACK array_size T_RBRACK { 976 $$ = add_array($1, true, to_int_constant($3, false)); 977 } 978 | type_direct_decl param_list asm_or_symbolrename_opt { 979 $$ = add_function(symbolrename($1, $3), $2); 980 end_declaration_level(); 981 block_level--; 982 } 983 | type_direct_decl type_attribute 984 ; 985 986 /* 987 * The two distinct rules type_param_decl and notype_param_decl avoid a 988 * conflict in argument lists. A typename enclosed in parentheses is always 989 * treated as a typename, not an argument name. For example, after 990 * "typedef double a;", the declaration "f(int (a));" is interpreted as 991 * "f(int (double));", not "f(int a);". 992 */ 993 type_param_decl: 994 direct_param_decl 995 | pointer direct_param_decl { 996 $$ = add_pointer($2, $1); 997 } 998 ; 999 1000 notype_param_decl: 1001 direct_notype_param_decl 1002 | pointer direct_notype_param_decl { 1003 $$ = add_pointer($2, $1); 1004 } 1005 ; 1006 1007 direct_param_decl: 1008 identifier type_attribute_list_opt { 1009 $$ = declarator_name(getsym($1)); 1010 } 1011 | T_LPAREN notype_param_decl T_RPAREN { 1012 $$ = $2; 1013 } 1014 | direct_param_decl T_LBRACK T_RBRACK { 1015 $$ = add_array($1, false, 0); 1016 } 1017 | direct_param_decl T_LBRACK array_size T_RBRACK { 1018 $$ = add_array($1, true, to_int_constant($3, false)); 1019 } 1020 | direct_param_decl param_list asm_or_symbolrename_opt { 1021 $$ = add_function(symbolrename($1, $3), $2); 1022 end_declaration_level(); 1023 block_level--; 1024 } 1025 ; 1026 1027 direct_notype_param_decl: 1028 identifier /* XXX: missing type_attribute_list_opt? */ { 1029 $$ = declarator_name(getsym($1)); 1030 } 1031 | T_LPAREN notype_param_decl T_RPAREN { 1032 $$ = $2; 1033 } 1034 | direct_notype_param_decl T_LBRACK T_RBRACK { 1035 $$ = add_array($1, false, 0); 1036 } 1037 | direct_notype_param_decl T_LBRACK array_size T_RBRACK { 1038 $$ = add_array($1, true, to_int_constant($3, false)); 1039 } 1040 | direct_notype_param_decl param_list asm_or_symbolrename_opt { 1041 $$ = add_function(symbolrename($1, $3), $2); 1042 end_declaration_level(); 1043 block_level--; 1044 } 1045 ; 1046 1047 pointer: /* C99 6.7.5 */ 1048 asterisk type_qualifier_list_opt { 1049 $$ = merge_qualified_pointer($1, $2); 1050 } 1051 | asterisk type_qualifier_list_opt pointer { 1052 $$ = merge_qualified_pointer($1, $2); 1053 $$ = merge_qualified_pointer($$, $3); 1054 } 1055 ; 1056 1057 asterisk: 1058 T_ASTERISK { 1059 $$ = xcalloc(1, sizeof(*$$)); 1060 $$->p_pointer = true; 1061 } 1062 ; 1063 1064 type_qualifier_list_opt: 1065 /* empty */ { 1066 $$ = NULL; 1067 } 1068 | type_qualifier_list 1069 ; 1070 1071 type_qualifier_list: /* C99 6.7.5 */ 1072 type_qualifier 1073 | type_qualifier_list type_qualifier { 1074 $$ = merge_qualified_pointer($1, $2); 1075 } 1076 ; 1077 1078 type_qualifier: 1079 T_QUAL { 1080 $$ = xcalloc(1, sizeof(*$$)); 1081 if ($1 == CONST) { 1082 $$->p_const = true; 1083 } else if ($1 == VOLATILE) { 1084 $$->p_volatile = true; 1085 } else { 1086 lint_assert($1 == RESTRICT || $1 == THREAD); 1087 } 1088 } 1089 ; 1090 1091 align_as: /* See alignment-specifier in C11 6.7.5 */ 1092 typespec 1093 | constant_expr 1094 ; 1095 1096 param_list: 1097 id_list_lparen identifier_list T_RPAREN { 1098 $$ = $2; 1099 } 1100 | abstract_decl_param_list 1101 ; 1102 1103 id_list_lparen: 1104 T_LPAREN { 1105 block_level++; 1106 begin_declaration_level(PROTO_ARG); 1107 } 1108 ; 1109 1110 identifier_list: 1111 T_NAME { 1112 $$ = old_style_function_name(getsym($1)); 1113 } 1114 | identifier_list T_COMMA T_NAME { 1115 $$ = lnklst($1, old_style_function_name(getsym($3))); 1116 } 1117 | identifier_list error 1118 ; 1119 1120 abstract_decl_param_list: 1121 abstract_decl_lparen T_RPAREN type_attribute_opt { 1122 $$ = NULL; 1123 } 1124 | abstract_decl_lparen vararg_parameter_type_list T_RPAREN type_attribute_opt { 1125 dcs->d_proto = true; 1126 $$ = $2; 1127 } 1128 | abstract_decl_lparen error T_RPAREN type_attribute_opt { 1129 $$ = NULL; 1130 } 1131 ; 1132 1133 abstract_decl_lparen: 1134 T_LPAREN { 1135 block_level++; 1136 begin_declaration_level(PROTO_ARG); 1137 } 1138 ; 1139 1140 vararg_parameter_type_list: 1141 parameter_type_list 1142 | parameter_type_list T_COMMA T_ELLIPSIS { 1143 dcs->d_vararg = true; 1144 $$ = $1; 1145 } 1146 | T_ELLIPSIS { 1147 if (sflag) { 1148 /* ANSI C requires formal parameter before '...' */ 1149 error(84); 1150 } else if (!tflag) { 1151 /* ANSI C requires formal parameter before '...' */ 1152 warning(84); 1153 } 1154 dcs->d_vararg = true; 1155 $$ = NULL; 1156 } 1157 ; 1158 1159 parameter_type_list: 1160 parameter_declaration 1161 | parameter_type_list T_COMMA parameter_declaration { 1162 $$ = lnklst($1, $3); 1163 } 1164 ; 1165 1166 /* XXX: C99 6.7.5 defines the same name, but it looks completely different. */ 1167 parameter_declaration: 1168 declmods deftyp { 1169 $$ = declare_argument(abstract_name(), false); 1170 } 1171 | declaration_specifiers deftyp { 1172 $$ = declare_argument(abstract_name(), false); 1173 } 1174 | declmods deftyp notype_param_decl { 1175 $$ = declare_argument($3, false); 1176 } 1177 | declaration_specifiers deftyp type_param_decl { 1178 $$ = declare_argument($3, false); 1179 } 1180 | declmods deftyp abstract_declarator { 1181 $$ = declare_argument($3, false); 1182 } 1183 | declaration_specifiers deftyp abstract_declarator { 1184 $$ = declare_argument($3, false); 1185 } 1186 ; 1187 1188 asm_or_symbolrename_opt: /* expect only one */ 1189 /* empty */ { 1190 $$ = NULL; 1191 } 1192 | T_ASM T_LPAREN T_STRING T_RPAREN { 1193 freeyyv(&$3, T_STRING); 1194 $$ = NULL; 1195 } 1196 | T_SYMBOLRENAME T_LPAREN T_NAME T_RPAREN { 1197 $$ = $3; 1198 } 1199 ; 1200 1201 initializer: /* C99 6.7.8 "Initialization" */ 1202 expr %prec T_COMMA { 1203 init_expr($1); 1204 } 1205 | init_lbrace init_rbrace { 1206 /* XXX: Empty braces are not covered by C99 6.7.8. */ 1207 } 1208 | init_lbrace initializer_list comma_opt init_rbrace 1209 | error 1210 ; 1211 1212 initializer_list: /* C99 6.7.8 "Initialization" */ 1213 initializer_list_item 1214 | initializer_list T_COMMA initializer_list_item 1215 ; 1216 1217 initializer_list_item: 1218 designation initializer 1219 | initializer 1220 ; 1221 1222 designation: /* C99 6.7.8 "Initialization" */ 1223 designator_list T_ASSIGN 1224 | identifier T_COLON { 1225 /* GCC style struct or union member name in initializer */ 1226 gnuism(315); 1227 add_designator_member($1); 1228 } 1229 ; 1230 1231 designator_list: /* C99 6.7.8 "Initialization" */ 1232 designator 1233 | designator_list designator 1234 ; 1235 1236 designator: /* C99 6.7.8 "Initialization" */ 1237 T_LBRACK range T_RBRACK { 1238 add_designator_subscript($2); 1239 if (!Sflag) 1240 /* array initializer with des.s is a C9X feature */ 1241 warning(321); 1242 } 1243 | T_POINT identifier { 1244 if (!Sflag) 1245 /* struct or union member name in initializer is ... */ 1246 warning(313); 1247 add_designator_member($2); 1248 } 1249 ; 1250 1251 range: 1252 constant_expr { 1253 $$.lo = to_int_constant($1, true); 1254 $$.hi = $$.lo; 1255 } 1256 | constant_expr T_ELLIPSIS constant_expr { 1257 $$.lo = to_int_constant($1, true); 1258 $$.hi = to_int_constant($3, true); 1259 /* initialization with '[a...b]' is a GCC extension */ 1260 gnuism(340); 1261 } 1262 ; 1263 1264 init_lbrace: 1265 T_LBRACE { 1266 init_lbrace(); 1267 } 1268 ; 1269 1270 init_rbrace: 1271 T_RBRACE { 1272 init_rbrace(); 1273 } 1274 ; 1275 1276 type_name: /* C99 6.7.6 */ 1277 { 1278 begin_declaration_level(ABSTRACT); 1279 } abstract_declaration { 1280 end_declaration_level(); 1281 $$ = $2->s_type; 1282 } 1283 ; 1284 1285 abstract_declaration: 1286 noclass_declmods deftyp { 1287 $$ = declare_1_abstract(abstract_name()); 1288 } 1289 | noclass_declspecs deftyp { 1290 $$ = declare_1_abstract(abstract_name()); 1291 } 1292 | noclass_declmods deftyp abstract_declarator { 1293 $$ = declare_1_abstract($3); 1294 } 1295 | noclass_declspecs deftyp abstract_declarator { 1296 $$ = declare_1_abstract($3); 1297 } 1298 ; 1299 1300 abstract_declarator: /* C99 6.7.6 */ 1301 pointer { 1302 $$ = add_pointer(abstract_name(), $1); 1303 } 1304 | direct_abstract_declarator 1305 | pointer direct_abstract_declarator { 1306 $$ = add_pointer($2, $1); 1307 } 1308 | T_TYPEOF term { /* GCC extension */ 1309 $$ = mktempsym($2->tn_type); 1310 } 1311 ; 1312 1313 direct_abstract_declarator: /* C99 6.7.6 */ 1314 direct_abstract_declarator_postfix 1315 | type_attribute direct_abstract_declarator_postfix { 1316 $$ = $2; 1317 } 1318 ; 1319 1320 direct_abstract_declarator_postfix: /* C99 6.7.6 */ 1321 T_LPAREN abstract_declarator T_RPAREN { 1322 $$ = $2; 1323 } 1324 | T_LBRACK T_RBRACK { 1325 $$ = add_array(abstract_name(), false, 0); 1326 } 1327 | T_LBRACK array_size T_RBRACK { 1328 $$ = add_array(abstract_name(), true, to_int_constant($2, false)); 1329 } 1330 | direct_abstract_declarator_postfix T_LBRACK T_RBRACK { 1331 $$ = add_array($1, false, 0); 1332 } 1333 | direct_abstract_declarator_postfix 1334 T_LBRACK T_ASTERISK T_RBRACK { /* C99 */ 1335 $$ = add_array($1, false, 0); 1336 } 1337 | direct_abstract_declarator_postfix T_LBRACK array_size T_RBRACK { 1338 $$ = add_array($1, true, to_int_constant($3, false)); 1339 } 1340 | abstract_decl_param_list asm_or_symbolrename_opt { 1341 $$ = add_function(symbolrename(abstract_name(), $2), $1); 1342 end_declaration_level(); 1343 block_level--; 1344 } 1345 | direct_abstract_declarator_postfix abstract_decl_param_list 1346 asm_or_symbolrename_opt { 1347 $$ = add_function(symbolrename($1, $3), $2); 1348 end_declaration_level(); 1349 block_level--; 1350 } 1351 | direct_abstract_declarator_postfix type_attribute 1352 ; 1353 1354 array_size: 1355 type_qualifier_list_opt T_SCLASS constant_expr { 1356 /* C11 6.7.6.3p7 */ 1357 if ($2 != STATIC) 1358 yyerror("Bad attribute"); 1359 /* static array size is a C11 extension */ 1360 c11ism(343); 1361 $$ = $3; 1362 } 1363 | constant_expr 1364 ; 1365 1366 non_expr_statement: 1367 gcc_attribute T_SEMI 1368 | labeled_statement 1369 | compound_statement 1370 | selection_statement 1371 | iteration_statement 1372 | jump_statement { 1373 seen_fallthrough = false; 1374 } 1375 | asm_statement 1376 ; 1377 1378 statement: /* C99 6.8 */ 1379 expression_statement 1380 | non_expr_statement 1381 ; 1382 1383 labeled_statement: /* C99 6.8.1 */ 1384 label gcc_attribute_list_opt statement 1385 ; 1386 1387 label: 1388 T_NAME T_COLON { 1389 symtyp = FLABEL; 1390 named_label(getsym($1)); 1391 } 1392 | T_CASE constant_expr T_COLON { 1393 case_label($2); 1394 seen_fallthrough = true; 1395 } 1396 | T_CASE constant_expr T_ELLIPSIS constant_expr T_COLON { 1397 /* XXX: We don't fill all cases */ 1398 case_label($2); 1399 seen_fallthrough = true; 1400 } 1401 | T_DEFAULT T_COLON { 1402 default_label(); 1403 seen_fallthrough = true; 1404 } 1405 ; 1406 1407 compound_statement: /* C99 6.8.2 */ 1408 compound_statement_lbrace block_item_list_opt 1409 compound_statement_rbrace 1410 ; 1411 1412 compound_statement_lbrace: 1413 T_LBRACE { 1414 block_level++; 1415 mem_block_level++; 1416 begin_declaration_level(AUTO); 1417 } 1418 ; 1419 1420 compound_statement_rbrace: 1421 T_RBRACE { 1422 end_declaration_level(); 1423 freeblk(); 1424 mem_block_level--; 1425 block_level--; 1426 seen_fallthrough = false; 1427 } 1428 ; 1429 1430 block_item_list_opt: /* C99 6.8.2 */ 1431 /* empty */ 1432 | block_item_list 1433 ; 1434 1435 block_item_list: 1436 block_item 1437 | block_item_list block_item { 1438 if (!Sflag && $1 && !$2) 1439 /* declarations after statements is a C99 feature */ 1440 c99ism(327); 1441 $$ = $1 || $2; 1442 } 1443 ; 1444 1445 block_item: 1446 statement { 1447 $$ = true; 1448 restore_warning_flags(); 1449 } 1450 | declaration { 1451 $$ = false; 1452 restore_warning_flags(); 1453 } 1454 ; 1455 1456 expression_statement: /* C99 6.8.3 */ 1457 expr T_SEMI { 1458 expr($1, false, false, false, false); 1459 seen_fallthrough = false; 1460 } 1461 | T_SEMI { 1462 seen_fallthrough = false; 1463 } 1464 ; 1465 1466 selection_statement: /* C99 6.8.4 */ 1467 if_without_else { 1468 save_warning_flags(); 1469 if2(); 1470 if3(false); 1471 } 1472 | if_without_else T_ELSE { 1473 save_warning_flags(); 1474 if2(); 1475 } statement { 1476 clear_warning_flags(); 1477 if3(true); 1478 } 1479 | if_without_else T_ELSE error { 1480 clear_warning_flags(); 1481 if3(false); 1482 } 1483 | switch_expr statement { 1484 clear_warning_flags(); 1485 switch2(); 1486 } 1487 | switch_expr error { 1488 clear_warning_flags(); 1489 switch2(); 1490 } 1491 ; 1492 1493 if_without_else: /* see C99 6.8.4 */ 1494 if_expr statement 1495 | if_expr error 1496 ; 1497 1498 if_expr: /* see C99 6.8.4 */ 1499 T_IF T_LPAREN expr T_RPAREN { 1500 if1($3); 1501 clear_warning_flags(); 1502 } 1503 ; 1504 1505 switch_expr: /* see C99 6.8.4 */ 1506 T_SWITCH T_LPAREN expr T_RPAREN { 1507 switch1($3); 1508 clear_warning_flags(); 1509 } 1510 ; 1511 1512 iteration_statement: /* C99 6.8.5 */ 1513 T_WHILE T_LPAREN expr T_RPAREN { 1514 while1($3); 1515 clear_warning_flags(); 1516 } while_body { 1517 clear_warning_flags(); 1518 while2(); 1519 } 1520 | do statement { 1521 clear_warning_flags(); 1522 } T_WHILE T_LPAREN expr T_RPAREN T_SEMI { 1523 do2($6); 1524 seen_fallthrough = false; 1525 } 1526 | do error { 1527 clear_warning_flags(); 1528 do2(NULL); 1529 } 1530 | for_exprs statement { 1531 clear_warning_flags(); 1532 for2(); 1533 end_declaration_level(); 1534 block_level--; 1535 } 1536 | for_exprs error { 1537 clear_warning_flags(); 1538 for2(); 1539 end_declaration_level(); 1540 block_level--; 1541 } 1542 ; 1543 1544 while_body: 1545 statement 1546 | error 1547 ; 1548 1549 do: /* see C99 6.8.5 */ 1550 T_DO { 1551 do1(); 1552 } 1553 ; 1554 1555 for_start: /* see C99 6.8.5 */ 1556 T_FOR T_LPAREN { 1557 begin_declaration_level(AUTO); 1558 block_level++; 1559 } 1560 ; 1561 1562 for_exprs: /* see C99 6.8.5 */ 1563 for_start declaration_specifiers deftyp notype_init_decls T_SEMI 1564 expr_opt T_SEMI expr_opt T_RPAREN { 1565 /* variable declaration in for loop */ 1566 c99ism(325); 1567 for1(NULL, $6, $8); 1568 clear_warning_flags(); 1569 } 1570 | for_start expr_opt T_SEMI expr_opt T_SEMI expr_opt T_RPAREN { 1571 for1($2, $4, $6); 1572 clear_warning_flags(); 1573 } 1574 ; 1575 1576 jump_statement: /* C99 6.8.6 */ 1577 goto identifier T_SEMI { 1578 do_goto(getsym($2)); 1579 } 1580 | goto error T_SEMI { 1581 symtyp = FVFT; 1582 } 1583 | T_CONTINUE T_SEMI { 1584 do_continue(); 1585 } 1586 | T_BREAK T_SEMI { 1587 do_break(); 1588 } 1589 | T_RETURN T_SEMI { 1590 do_return(NULL); 1591 } 1592 | T_RETURN expr T_SEMI { 1593 do_return($2); 1594 } 1595 ; 1596 1597 goto: 1598 T_GOTO { 1599 symtyp = FLABEL; 1600 } 1601 ; 1602 1603 asm_statement: 1604 T_ASM T_LPAREN read_until_rparen T_SEMI { 1605 setasm(); 1606 } 1607 | T_ASM T_QUAL T_LPAREN read_until_rparen T_SEMI { 1608 setasm(); 1609 } 1610 | T_ASM error 1611 ; 1612 1613 read_until_rparen: 1614 /* empty */ { 1615 ignore_up_to_rparen(); 1616 } 1617 ; 1618 1619 constant_expr_list_opt: 1620 /* empty */ 1621 | constant_expr_list 1622 ; 1623 1624 constant_expr_list: 1625 constant_expr 1626 | constant_expr_list T_COMMA constant_expr 1627 ; 1628 1629 constant_expr: /* C99 6.6 */ 1630 expr %prec T_ASSIGN 1631 ; 1632 1633 expr_opt: 1634 /* empty */ { 1635 $$ = NULL; 1636 } 1637 | expr 1638 ; 1639 1640 expr: /* C99 6.5 */ 1641 expr T_ASTERISK expr { 1642 $$ = build(MULT, $1, $3); 1643 } 1644 | expr T_MULTIPLICATIVE expr { 1645 $$ = build($2, $1, $3); 1646 } 1647 | expr T_ADDITIVE expr { 1648 $$ = build($2, $1, $3); 1649 } 1650 | expr T_SHIFT expr { 1651 $$ = build($2, $1, $3); 1652 } 1653 | expr T_RELATIONAL expr { 1654 $$ = build($2, $1, $3); 1655 } 1656 | expr T_EQUALITY expr { 1657 $$ = build($2, $1, $3); 1658 } 1659 | expr T_AMPER expr { 1660 $$ = build(BITAND, $1, $3); 1661 } 1662 | expr T_BITXOR expr { 1663 $$ = build(BITXOR, $1, $3); 1664 } 1665 | expr T_BITOR expr { 1666 $$ = build(BITOR, $1, $3); 1667 } 1668 | expr T_LOGAND expr { 1669 $$ = build(LOGAND, $1, $3); 1670 } 1671 | expr T_LOGOR expr { 1672 $$ = build(LOGOR, $1, $3); 1673 } 1674 | expr T_QUEST expr T_COLON expr { 1675 $$ = build(QUEST, $1, build(COLON, $3, $5)); 1676 } 1677 | expr T_ASSIGN expr { 1678 $$ = build(ASSIGN, $1, $3); 1679 } 1680 | expr T_OPASSIGN expr { 1681 $$ = build($2, $1, $3); 1682 } 1683 | expr T_COMMA expr { 1684 $$ = build(COMMA, $1, $3); 1685 } 1686 | term 1687 | generic_selection 1688 ; 1689 1690 assignment_expression: /* C99 6.5.16 */ 1691 expr %prec T_ASSIGN 1692 ; 1693 1694 term: /* see C99 6.5.1 */ 1695 T_NAME { 1696 /* XXX really necessary? */ 1697 if (yychar < 0) 1698 yychar = yylex(); 1699 $$ = new_name_node(getsym($1), yychar); 1700 } 1701 | string { 1702 $$ = new_string_node($1); 1703 } 1704 | T_CON { 1705 $$ = expr_new_constant(gettyp($1->v_tspec), $1); 1706 } 1707 | T_LPAREN expr T_RPAREN { 1708 if ($2 != NULL) 1709 $2->tn_parenthesized = true; 1710 $$ = $2; 1711 } 1712 | T_LPAREN compound_statement_lbrace gcc_statement_expr_list { 1713 block_level--; 1714 mem_block_level--; 1715 begin_initialization(mktempsym(dup_type($3->tn_type))); 1716 mem_block_level++; 1717 block_level++; 1718 /* ({ }) is a GCC extension */ 1719 gnuism(320); 1720 } compound_statement_rbrace T_RPAREN { 1721 $$ = new_name_node(*current_initsym(), 0); 1722 end_initialization(); 1723 } 1724 | term T_INCDEC { 1725 $$ = build($2 == INC ? INCAFT : DECAFT, $1, NULL); 1726 } 1727 | T_INCDEC term { 1728 $$ = build($1 == INC ? INCBEF : DECBEF, $2, NULL); 1729 } 1730 | T_ASTERISK term { 1731 $$ = build(INDIR, $2, NULL); 1732 } 1733 | T_AMPER term { 1734 $$ = build(ADDR, $2, NULL); 1735 } 1736 | T_UNARY term { 1737 $$ = build($1, $2, NULL); 1738 } 1739 | T_ADDITIVE term { 1740 if (tflag && $1 == PLUS) { 1741 /* unary + is illegal in traditional C */ 1742 warning(100); 1743 } 1744 $$ = build($1 == PLUS ? UPLUS : UMINUS, $2, NULL); 1745 } 1746 | term T_LBRACK expr T_RBRACK { 1747 $$ = build(INDIR, build(PLUS, $1, $3), NULL); 1748 } 1749 | term T_LPAREN T_RPAREN { 1750 $$ = new_function_call_node($1, NULL); 1751 } 1752 | term T_LPAREN func_arg_list T_RPAREN { 1753 $$ = new_function_call_node($1, $3); 1754 } 1755 | term point_or_arrow T_NAME { 1756 if ($1 != NULL) { 1757 sym_t *msym; 1758 /* 1759 * XXX struct_or_union_member should be integrated 1760 * in build() 1761 */ 1762 if ($2 == ARROW) { 1763 /* 1764 * must do this before struct_or_union_member 1765 * is called 1766 */ 1767 $1 = cconv($1); 1768 } 1769 msym = struct_or_union_member($1, $2, getsym($3)); 1770 $$ = build($2, $1, new_name_node(msym, 0)); 1771 } else { 1772 $$ = NULL; 1773 } 1774 } 1775 | T_REAL term { 1776 $$ = build(REAL, $2, NULL); 1777 } 1778 | T_IMAG term { 1779 $$ = build(IMAG, $2, NULL); 1780 } 1781 | T_EXTENSION term { 1782 $$ = $2; 1783 } 1784 | T_BUILTIN_OFFSETOF T_LPAREN type_name T_COMMA identifier T_RPAREN { 1785 symtyp = FMEMBER; 1786 $$ = build_offsetof($3, getsym($5)); 1787 } 1788 | T_SIZEOF term { 1789 $$ = $2 == NULL ? NULL : build_sizeof($2->tn_type); 1790 if ($$ != NULL) 1791 check_expr_misc($2, false, false, false, false, false, true); 1792 } 1793 | T_SIZEOF T_LPAREN type_name T_RPAREN %prec T_SIZEOF { 1794 $$ = build_sizeof($3); 1795 } 1796 | T_ALIGNOF T_LPAREN type_name T_RPAREN { 1797 $$ = build_alignof($3); 1798 } 1799 | T_LPAREN type_name T_RPAREN term %prec T_UNARY { 1800 $$ = cast($4, $2); 1801 } 1802 | T_LPAREN type_name T_RPAREN { /* C99 6.5.2.5 "Compound literals" */ 1803 sym_t *tmp = mktempsym($2); 1804 begin_initialization(tmp); 1805 cgram_declare(tmp, true, NULL); 1806 } init_lbrace initializer_list comma_opt init_rbrace { 1807 if (!Sflag) 1808 /* compound literals are a C9X/GCC extension */ 1809 gnuism(319); 1810 $$ = new_name_node(*current_initsym(), 0); 1811 end_initialization(); 1812 } 1813 ; 1814 1815 generic_selection: /* C11 6.5.1.1 */ 1816 T_GENERIC T_LPAREN assignment_expression T_COMMA 1817 generic_assoc_list T_RPAREN { 1818 /* generic selection requires C11 or later */ 1819 c11ism(345); 1820 $$ = build_generic_selection($3, $5); 1821 } 1822 ; 1823 1824 generic_assoc_list: /* C11 6.5.1.1 */ 1825 generic_association 1826 | generic_assoc_list T_COMMA generic_association { 1827 $3->ga_prev = $1; 1828 $$ = $3; 1829 } 1830 ; 1831 1832 generic_association: /* C11 6.5.1.1 */ 1833 type_name T_COLON assignment_expression { 1834 $$ = getblk(sizeof(*$$)); 1835 $$->ga_arg = $1; 1836 $$->ga_result = $3; 1837 } 1838 | T_DEFAULT T_COLON assignment_expression { 1839 $$ = getblk(sizeof(*$$)); 1840 $$->ga_arg = NULL; 1841 $$->ga_result = $3; 1842 } 1843 ; 1844 1845 /* 1846 * The inner part of a GCC statement-expression of the form ({ ... }). 1847 * 1848 * https://gcc.gnu.org/onlinedocs/gcc/Statement-Exprs.html 1849 */ 1850 gcc_statement_expr_list: 1851 gcc_statement_expr_item 1852 | gcc_statement_expr_list gcc_statement_expr_item { 1853 $$ = $2; 1854 } 1855 ; 1856 1857 gcc_statement_expr_item: 1858 declaration { 1859 clear_warning_flags(); 1860 $$ = NULL; 1861 } 1862 | non_expr_statement { 1863 $$ = expr_zalloc_tnode(); 1864 $$->tn_type = gettyp(VOID); 1865 } 1866 | expr T_SEMI { 1867 if ($1 == NULL) { /* in case of syntax errors */ 1868 $$ = expr_zalloc_tnode(); 1869 $$->tn_type = gettyp(VOID); 1870 } else { 1871 /* XXX: do that only on the last name */ 1872 if ($1->tn_op == NAME) 1873 $1->tn_sym->s_used = true; 1874 $$ = $1; 1875 expr($1, false, false, false, false); 1876 seen_fallthrough = false; 1877 } 1878 } 1879 ; 1880 1881 string: 1882 T_STRING 1883 | T_STRING string2 { 1884 $$ = cat_strings($1, $2); 1885 } 1886 ; 1887 1888 string2: 1889 T_STRING { 1890 if (tflag) { 1891 /* concatenated strings are illegal in traditional C */ 1892 warning(219); 1893 } 1894 $$ = $1; 1895 } 1896 | string2 T_STRING { 1897 $$ = cat_strings($1, $2); 1898 } 1899 ; 1900 1901 func_arg_list: 1902 expr %prec T_COMMA { 1903 $$ = new_function_argument_node(NULL, $1); 1904 } 1905 | func_arg_list T_COMMA expr { 1906 $$ = new_function_argument_node($1, $3); 1907 } 1908 ; 1909 1910 point_or_arrow: 1911 T_POINT { 1912 symtyp = FMEMBER; 1913 $$ = POINT; 1914 } 1915 | T_ARROW { 1916 symtyp = FMEMBER; 1917 $$ = ARROW; 1918 } 1919 ; 1920 1921 identifier: /* C99 6.4.2.1 */ 1922 T_NAME { 1923 $$ = $1; 1924 cgram_debug("name '%s'", $$->sb_name); 1925 } 1926 | T_TYPENAME { 1927 $$ = $1; 1928 cgram_debug("typename '%s'", $$->sb_name); 1929 } 1930 ; 1931 1932 comma_opt: 1933 /* empty */ 1934 | T_COMMA 1935 ; 1936 1937 /* GCC extensions */ 1938 1939 type_attribute_list_opt: 1940 /* empty */ 1941 | type_attribute_list 1942 ; 1943 1944 type_attribute_list: 1945 type_attribute 1946 | type_attribute_list type_attribute 1947 ; 1948 1949 type_attribute_opt: 1950 /* empty */ 1951 | type_attribute 1952 ; 1953 1954 type_attribute: 1955 gcc_attribute 1956 | T_ALIGNAS T_LPAREN align_as T_RPAREN 1957 | T_PACKED { 1958 addpacked(); 1959 } 1960 | T_NORETURN 1961 ; 1962 1963 gcc_attribute_list_opt: 1964 /* empty */ 1965 | gcc_attribute_list 1966 ; 1967 1968 gcc_attribute_list: 1969 gcc_attribute 1970 | gcc_attribute_list gcc_attribute 1971 ; 1972 1973 /* https://gcc.gnu.org/onlinedocs/gcc/Attribute-Syntax.html */ 1974 gcc_attribute: 1975 T_ATTRIBUTE T_LPAREN T_LPAREN { 1976 attron = true; 1977 } gcc_attribute_spec_list { 1978 attron = false; 1979 } T_RPAREN T_RPAREN 1980 ; 1981 1982 gcc_attribute_spec_list: 1983 gcc_attribute_spec 1984 | gcc_attribute_spec_list T_COMMA gcc_attribute_spec 1985 ; 1986 1987 gcc_attribute_spec: 1988 /* empty */ 1989 | T_AT_ALWAYS_INLINE 1990 | T_AT_ALIAS T_LPAREN string T_RPAREN 1991 | T_AT_ALIGNED T_LPAREN constant_expr T_RPAREN 1992 | T_AT_ALIGNED 1993 | T_AT_ALLOC_SIZE T_LPAREN constant_expr T_COMMA constant_expr T_RPAREN 1994 | T_AT_ALLOC_SIZE T_LPAREN constant_expr T_RPAREN 1995 | T_AT_BOUNDED T_LPAREN gcc_attribute_bounded 1996 T_COMMA constant_expr T_COMMA constant_expr T_RPAREN 1997 | T_AT_COLD 1998 | T_AT_COMMON 1999 | T_AT_CONSTRUCTOR T_LPAREN constant_expr T_RPAREN 2000 | T_AT_CONSTRUCTOR 2001 | T_AT_DEPRECATED T_LPAREN string T_RPAREN 2002 | T_AT_DEPRECATED 2003 | T_AT_DESTRUCTOR T_LPAREN constant_expr T_RPAREN 2004 | T_AT_DESTRUCTOR 2005 | T_AT_FALLTHROUGH { 2006 fallthru(1); 2007 } 2008 | T_AT_FORMAT T_LPAREN gcc_attribute_format T_COMMA 2009 constant_expr T_COMMA constant_expr T_RPAREN 2010 | T_AT_FORMAT_ARG T_LPAREN constant_expr T_RPAREN 2011 | T_AT_GNU_INLINE 2012 | T_AT_MALLOC 2013 | T_AT_MAY_ALIAS 2014 | T_AT_MODE T_LPAREN T_NAME T_RPAREN 2015 | T_AT_NOINLINE 2016 | T_AT_NONNULL T_LPAREN constant_expr_list_opt T_RPAREN 2017 | T_AT_NONNULL 2018 | T_AT_NONSTRING 2019 | T_AT_NORETURN 2020 | T_AT_NOTHROW 2021 | T_AT_NO_INSTRUMENT_FUNCTION 2022 | T_AT_OPTIMIZE T_LPAREN string T_RPAREN 2023 | T_AT_PACKED { 2024 addpacked(); 2025 } 2026 | T_AT_PCS T_LPAREN string T_RPAREN 2027 | T_AT_PURE 2028 | T_AT_RETURNS_TWICE 2029 | T_AT_SECTION T_LPAREN string T_RPAREN 2030 | T_AT_SENTINEL T_LPAREN constant_expr T_RPAREN 2031 | T_AT_SENTINEL 2032 | T_AT_TLS_MODEL T_LPAREN string T_RPAREN 2033 | T_AT_TUNION 2034 | T_AT_UNUSED { 2035 add_attr_used(); 2036 } 2037 | T_AT_USED { 2038 add_attr_used(); 2039 } 2040 | T_AT_VISIBILITY T_LPAREN constant_expr T_RPAREN 2041 | T_AT_WARN_UNUSED_RESULT 2042 | T_AT_WEAK 2043 | T_QUAL { 2044 if ($1 != CONST) 2045 yyerror("Bad attribute"); 2046 } 2047 ; 2048 2049 gcc_attribute_bounded: 2050 T_AT_MINBYTES 2051 | T_AT_STRING 2052 | T_AT_BUFFER 2053 ; 2054 2055 gcc_attribute_format: 2056 T_AT_FORMAT_GNU_PRINTF 2057 | T_AT_FORMAT_PRINTF 2058 | T_AT_FORMAT_SCANF 2059 | T_AT_FORMAT_STRFMON 2060 | T_AT_FORMAT_STRFTIME 2061 | T_AT_FORMAT_SYSLOG 2062 ; 2063 2064 %% 2065 2066 /* ARGSUSED */ 2067 int 2068 yyerror(const char *msg) 2069 { 2070 /* syntax error '%s' */ 2071 error(249, yytext); 2072 if (++sytxerr >= 5) 2073 norecover(); 2074 return 0; 2075 } 2076 2077 static void 2078 cgram_declare(sym_t *decl, bool initflg, sbuf_t *renaming) 2079 { 2080 declare(decl, initflg, renaming); 2081 if (renaming != NULL) 2082 freeyyv(&renaming, T_NAME); 2083 } 2084 2085 /* 2086 * Discard all input tokens up to and including the next 2087 * unmatched right paren 2088 */ 2089 static void 2090 ignore_up_to_rparen(void) 2091 { 2092 int level; 2093 2094 if (yychar < 0) 2095 yychar = yylex(); 2096 freeyyv(&yylval, yychar); 2097 2098 level = 1; 2099 while (yychar != T_RPAREN || --level > 0) { 2100 if (yychar == T_LPAREN) { 2101 level++; 2102 } else if (yychar <= 0) { 2103 break; 2104 } 2105 freeyyv(&yylval, yychar = yylex()); 2106 } 2107 2108 yyclearin; 2109 } 2110 2111 static sym_t * 2112 symbolrename(sym_t *s, sbuf_t *sb) 2113 { 2114 if (sb != NULL) 2115 s->s_rename = sb->sb_name; 2116 return s; 2117 } 2118
Indexes created Fri Oct 03 02:09:57 GMT 2025