cgram.y revision 1.302
1 %{ 2 /* $NetBSD: cgram.y,v 1.302 2021/07/10 20:58:35 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 1.302 2021/07/10 20:58:35 rillig Exp $"); 39 #endif 40 41 #include <limits.h> 42 #include <stdlib.h> 43 #include <string.h> 44 45 #include "lint1.h" 46 47 extern char *yytext; 48 49 /* 50 * Contains the level of current declaration, used for symbol table entries. 51 * 0 is the top-level, > 0 is inside a function body. 52 */ 53 int block_level; 54 55 /* 56 * level for memory allocation. Normally the same as block_level. 57 * An exception is the declaration of arguments in prototypes. Memory 58 * for these can't be freed after the declaration, but symbols must 59 * be removed from the symbol table after the declaration. 60 */ 61 int mem_block_level; 62 63 /* 64 * Save the no-warns state and restore it to avoid the problem where 65 * if (expr) { stmt } / * NOLINT * / stmt; 66 */ 67 static int olwarn = LWARN_BAD; 68 69 static void cgram_declare(sym_t *, bool, sbuf_t *); 70 static void ignore_up_to_rparen(void); 71 static sym_t *symbolrename(sym_t *, sbuf_t *); 72 73 74 #ifdef DEBUG 75 static void 76 CLEAR_WARN_FLAGS(const char *file, size_t line) 77 { 78 printf("%s:%d: %s:%zu: clearing flags\n", 79 curr_pos.p_file, curr_pos.p_line, file, line); 80 clear_warn_flags(); 81 olwarn = LWARN_BAD; 82 } 83 84 static void 85 SAVE_WARN_FLAGS(const char *file, size_t line) 86 { 87 lint_assert(olwarn == LWARN_BAD); 88 printf("%s:%d: %s:%zu: saving flags %d\n", 89 curr_pos.p_file, curr_pos.p_line, file, line, lwarn); 90 olwarn = lwarn; 91 } 92 93 static void 94 RESTORE_WARN_FLAGS(const char *file, size_t line) 95 { 96 if (olwarn != LWARN_BAD) { 97 lwarn = olwarn; 98 printf("%s:%d: %s:%zu: restoring flags %d\n", 99 curr_pos.p_file, curr_pos.p_line, file, line, lwarn); 100 olwarn = LWARN_BAD; 101 } else 102 CLEAR_WARN_FLAGS(file, line); 103 } 104 #define cgram_debug(fmt, args...) printf("cgram_debug: " fmt "\n", ##args) 105 #else 106 #define CLEAR_WARN_FLAGS(f, l) clear_warn_flags(), olwarn = LWARN_BAD 107 #define SAVE_WARN_FLAGS(f, l) olwarn = lwarn 108 #define RESTORE_WARN_FLAGS(f, l) \ 109 (void)(olwarn == LWARN_BAD ? (clear_warn_flags(), 0) : (lwarn = olwarn)) 110 #define cgram_debug(fmt, args...) do { } while (false) 111 #endif 112 113 #define clear_warning_flags() CLEAR_WARN_FLAGS(__FILE__, __LINE__) 114 #define save_warning_flags() SAVE_WARN_FLAGS(__FILE__, __LINE__) 115 #define restore_warning_flags() RESTORE_WARN_FLAGS(__FILE__, __LINE__) 116 117 /* unbind the anonymous struct members from the struct */ 118 static void 119 anonymize(sym_t *s) 120 { 121 for ( ; s != NULL; s = s->s_next) 122 s->s_styp = NULL; 123 } 124 125 %} 126 127 %expect 136 128 129 %union { 130 val_t *y_val; 131 sbuf_t *y_name; 132 sym_t *y_sym; 133 op_t y_op; 134 scl_t y_scl; 135 tspec_t y_tspec; 136 tqual_t y_tqual; 137 type_t *y_type; 138 tnode_t *y_tnode; 139 range_t y_range; 140 strg_t *y_string; 141 qual_ptr *y_qual_ptr; 142 bool y_seen_statement; 143 struct generic_association *y_generic; 144 }; 145 146 %token T_LBRACE T_RBRACE T_LBRACK T_RBRACK T_LPAREN T_RPAREN 147 %token T_POINT T_ARROW 148 %token <y_op> T_UNARY 149 %token <y_op> T_INCDEC 150 %token T_SIZEOF 151 %token T_BUILTIN_OFFSETOF 152 %token T_TYPEOF 153 %token T_EXTENSION 154 %token T_ALIGNAS 155 %token T_ALIGNOF 156 %token T_ASTERISK 157 %token <y_op> T_MULTIPLICATIVE 158 %token <y_op> T_ADDITIVE 159 %token <y_op> T_SHIFT 160 %token <y_op> T_RELATIONAL 161 %token <y_op> T_EQUALITY 162 %token T_AMPER 163 %token T_BITXOR 164 %token T_BITOR 165 %token T_LOGAND 166 %token T_LOGOR 167 %token T_QUEST 168 %token T_COLON 169 %token T_ASSIGN 170 %token <y_op> T_OPASSIGN 171 %token T_COMMA 172 %token T_SEMI 173 %token T_ELLIPSIS 174 %token T_REAL 175 %token T_IMAG 176 %token T_GENERIC 177 %token T_NORETURN 178 179 /* storage classes (extern, static, auto, register and typedef) */ 180 %token <y_scl> T_SCLASS 181 182 /* 183 * predefined type keywords (char, int, short, long, unsigned, signed, 184 * float, double, void); see T_TYPENAME 185 */ 186 %token <y_tspec> T_TYPE 187 188 /* qualifiers (const, volatile, restrict, _Thread_local) */ 189 %token <y_tqual> T_QUAL 190 191 /* struct or union */ 192 %token <y_tspec> T_STRUCT_OR_UNION 193 194 /* remaining keywords */ 195 %token T_ASM 196 %token T_BREAK 197 %token T_CASE 198 %token T_CONTINUE 199 %token T_DEFAULT 200 %token T_DO 201 %token T_ELSE 202 %token T_ENUM 203 %token T_FOR 204 %token T_GOTO 205 %token T_IF 206 %token T_PACKED 207 %token T_RETURN 208 %token T_SWITCH 209 %token T_SYMBOLRENAME 210 %token T_WHILE 211 212 %token T_ATTRIBUTE 213 %token T_AT_ALIAS 214 %token T_AT_ALIGNED 215 %token T_AT_ALLOC_SIZE 216 %token T_AT_ALWAYS_INLINE 217 %token T_AT_BOUNDED 218 %token T_AT_BUFFER 219 %token T_AT_COLD 220 %token T_AT_COMMON 221 %token T_AT_CONSTRUCTOR 222 %token T_AT_DEPRECATED 223 %token T_AT_DESTRUCTOR 224 %token T_AT_FALLTHROUGH 225 %token T_AT_FORMAT 226 %token T_AT_FORMAT_ARG 227 %token T_AT_FORMAT_GNU_PRINTF 228 %token T_AT_FORMAT_PRINTF 229 %token T_AT_FORMAT_SCANF 230 %token T_AT_FORMAT_STRFMON 231 %token T_AT_FORMAT_STRFTIME 232 %token T_AT_FORMAT_SYSLOG 233 %token T_AT_GNU_INLINE 234 %token T_AT_MALLOC 235 %token T_AT_MAY_ALIAS 236 %token T_AT_MINBYTES 237 %token T_AT_MODE 238 %token T_AT_NOINLINE 239 %token T_AT_NONNULL 240 %token T_AT_NONSTRING 241 %token T_AT_NORETURN 242 %token T_AT_NOTHROW 243 %token T_AT_NO_INSTRUMENT_FUNCTION 244 %token T_AT_OPTIMIZE 245 %token T_AT_PACKED 246 %token T_AT_PCS 247 %token T_AT_PURE 248 %token T_AT_RETURNS_TWICE 249 %token T_AT_SECTION 250 %token T_AT_SENTINEL 251 %token T_AT_STRING 252 %token T_AT_TLS_MODEL 253 %token T_AT_TUNION 254 %token T_AT_UNUSED 255 %token T_AT_USED 256 %token T_AT_VISIBILITY 257 %token T_AT_WARN_UNUSED_RESULT 258 %token T_AT_WEAK 259 260 %left T_COMMA 261 %right T_ASSIGN T_OPASSIGN 262 %right T_QUEST T_COLON 263 %left T_LOGOR 264 %left T_LOGAND 265 %left T_BITOR 266 %left T_BITXOR 267 %left T_AMPER 268 %left T_EQUALITY 269 %left T_RELATIONAL 270 %left T_SHIFT 271 %left T_ADDITIVE 272 %left T_ASTERISK T_MULTIPLICATIVE 273 %right T_UNARY T_INCDEC T_SIZEOF T_REAL T_IMAG 274 %left T_LPAREN T_LBRACK T_POINT T_ARROW 275 276 %token <y_name> T_NAME 277 %token <y_name> T_TYPENAME 278 %token <y_val> T_CON 279 %token <y_string> T_STRING 280 281 %type <y_sym> func_decl 282 %type <y_sym> notype_decl 283 %type <y_sym> type_decl 284 %type <y_type> type_specifier 285 %type <y_type> notype_type_specifier 286 %type <y_type> struct_or_union_specifier 287 %type <y_type> enum_specifier 288 %type <y_tspec> struct_or_union 289 %type <y_sym> braced_struct_declaration_list 290 %type <y_sym> identifier_sym 291 %type <y_name> identifier 292 %type <y_sym> struct_declaration_list_semi 293 %type <y_sym> struct_declaration_list 294 %type <y_sym> struct_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> notype_direct_decl 305 %type <y_sym> type_direct_decl 306 %type <y_qual_ptr> pointer 307 %type <y_qual_ptr> asterisk 308 %type <y_sym> type_param_decl 309 %type <y_sym> param_list 310 %type <y_sym> abstract_decl_param_list 311 %type <y_sym> direct_param_decl 312 %type <y_sym> notype_param_decl 313 %type <y_sym> direct_notype_param_decl 314 %type <y_qual_ptr> type_qualifier_list_opt 315 %type <y_qual_ptr> type_qualifier_list 316 %type <y_qual_ptr> type_qualifier 317 %type <y_sym> identifier_list 318 %type <y_sym> abstract_declarator 319 %type <y_sym> direct_abstract_declarator 320 %type <y_sym> direct_abstract_declarator_postfix 321 %type <y_sym> vararg_parameter_type_list 322 %type <y_sym> parameter_type_list 323 %type <y_sym> parameter_declaration 324 %type <y_tnode> expr 325 %type <y_tnode> assignment_expression 326 %type <y_tnode> gcc_statement_expr_list 327 %type <y_tnode> gcc_statement_expr_item 328 %type <y_tnode> term 329 %type <y_tnode> generic_selection 330 %type <y_tnode> argument_expression_list 331 %type <y_op> point_or_arrow 332 %type <y_type> type_name 333 %type <y_sym> abstract_declaration 334 %type <y_tnode> expr_opt 335 %type <y_string> string 336 %type <y_string> string2 337 %type <y_name> asm_or_symbolrename_opt 338 %type <y_range> range 339 %type <y_seen_statement> block_item_list 340 %type <y_seen_statement> block_item 341 %type <y_generic> generic_assoc_list 342 %type <y_generic> generic_association 343 344 %% 345 346 program: 347 /* empty */ { 348 if (sflag) { 349 /* empty translation unit */ 350 error(272); 351 } else if (!tflag) { 352 /* empty translation unit */ 353 warning(272); 354 } 355 } 356 | translation_unit 357 ; 358 359 translation_unit: /* C99 6.9 */ 360 external_declaration 361 | translation_unit external_declaration 362 ; 363 364 external_declaration: /* C99 6.9 */ 365 asm_statement 366 | function_definition { 367 global_clean_up_decl(false); 368 clear_warning_flags(); 369 } 370 | top_level_declaration { 371 global_clean_up_decl(false); 372 clear_warning_flags(); 373 } 374 ; 375 376 /* 377 * On the top level, lint allows several forms of declarations that it doesn't 378 * allow in functions. For example, a single ';' is an empty declaration and 379 * is supported by some compilers, but in a function it would be an empty 380 * statement, not a declaration. This makes a difference in C90 mode, where 381 * a statement must not be followed by a declaration. 382 * 383 * See 'declaration' for all other declarations. 384 */ 385 top_level_declaration: /* C99 6.9 calls this 'declaration' */ 386 T_SEMI { 387 if (sflag) { 388 /* empty declaration */ 389 error(0); 390 } else if (!tflag) { 391 /* empty declaration */ 392 warning(0); 393 } 394 } 395 | begin_type end_type notype_init_decls T_SEMI { 396 if (sflag) { 397 /* old style declaration; add 'int' */ 398 error(1); 399 } else if (!tflag) { 400 /* old style declaration; add 'int' */ 401 warning(1); 402 } 403 } 404 | declaration_noerror 405 | error T_SEMI { 406 global_clean_up(); 407 } 408 | error T_RBRACE { 409 global_clean_up(); 410 } 411 ; 412 413 function_definition: /* C99 6.9.1 */ 414 func_decl { 415 if ($1->s_type->t_tspec != FUNC) { 416 /* syntax error '%s' */ 417 error(249, yytext); 418 YYERROR; 419 } 420 if ($1->s_type->t_typedef) { 421 /* ()-less function definition */ 422 error(64); 423 YYERROR; 424 } 425 funcdef($1); 426 block_level++; 427 begin_declaration_level(ARG); 428 if (lwarn == LWARN_NONE) 429 $1->s_used = true; 430 } arg_declaration_list_opt { 431 end_declaration_level(); 432 block_level--; 433 check_func_lint_directives(); 434 check_func_old_style_arguments(); 435 begin_control_statement(CS_FUNCTION_BODY); 436 } compound_statement { 437 funcend(); 438 end_control_statement(CS_FUNCTION_BODY); 439 } 440 ; 441 442 func_decl: 443 begin_type end_type notype_decl { 444 $$ = $3; 445 } 446 | begin_type declmods end_type notype_decl { 447 $$ = $4; 448 } 449 | begin_type declaration_specifiers end_type type_decl { 450 $$ = $4; 451 } 452 ; 453 454 arg_declaration_list_opt: /* C99 6.9.1p13 example 1 */ 455 /* empty */ 456 | arg_declaration_list 457 ; 458 459 arg_declaration_list: /* C99 6.9.1p13 example 1 */ 460 arg_declaration 461 | arg_declaration_list arg_declaration 462 /* XXX or better "arg_declaration error" ? */ 463 | error 464 ; 465 466 /* 467 * "arg_declaration" is separated from "declaration" because it 468 * needs other error handling. 469 */ 470 arg_declaration: 471 begin_type declmods end_type T_SEMI { 472 /* empty declaration */ 473 warning(2); 474 } 475 | begin_type declmods end_type notype_init_decls T_SEMI 476 | begin_type declaration_specifiers end_type T_SEMI { 477 if (!dcs->d_nonempty_decl) { 478 /* empty declaration */ 479 warning(2); 480 } else { 481 /* '%s' declared in argument declaration list */ 482 warning(3, type_name(dcs->d_type)); 483 } 484 } 485 | begin_type declaration_specifiers end_type type_init_decls T_SEMI { 486 if (dcs->d_nonempty_decl) { 487 /* '%s' declared in argument declaration list */ 488 warning(3, type_name(dcs->d_type)); 489 } 490 } 491 | begin_type declmods error 492 | begin_type declaration_specifiers error 493 ; 494 495 declaration: /* C99 6.7 */ 496 declaration_noerror 497 | error T_SEMI 498 ; 499 500 declaration_noerror: /* see C99 6.7 'declaration' */ 501 begin_type declmods end_type T_SEMI { 502 if (dcs->d_scl == TYPEDEF) { 503 /* typedef declares no type name */ 504 warning(72); 505 } else { 506 /* empty declaration */ 507 warning(2); 508 } 509 } 510 | begin_type declmods end_type notype_init_decls T_SEMI 511 | begin_type declaration_specifiers end_type T_SEMI { 512 if (dcs->d_scl == TYPEDEF) { 513 /* typedef declares no type name */ 514 warning(72); 515 } else if (!dcs->d_nonempty_decl) { 516 /* empty declaration */ 517 warning(2); 518 } 519 } 520 | begin_type declaration_specifiers end_type type_init_decls T_SEMI 521 ; 522 523 begin_type: 524 /* empty */ { 525 begin_type(); 526 } 527 ; 528 529 end_type: 530 /* empty */ { 531 end_type(); 532 } 533 ; 534 535 declaration_specifiers: /* C99 6.7 */ 536 add_type_specifier 537 | declmods add_type_specifier 538 | type_attribute declaration_specifiers 539 | declaration_specifiers declmod 540 | declaration_specifiers add_notype_type_specifier 541 ; 542 543 declmods: 544 qualifier_or_storage_class 545 | declmods declmod 546 ; 547 548 declmod: 549 qualifier_or_storage_class 550 | type_attribute 551 ; 552 553 qualifier_or_storage_class: 554 add_type_qualifier 555 | T_SCLASS { 556 add_storage_class($1); 557 } 558 ; 559 560 add_type_specifier: 561 type_specifier { 562 add_type($1); 563 } 564 ; 565 566 type_attribute_list_opt: 567 /* empty */ 568 | type_attribute_list 569 ; 570 571 type_attribute_list: 572 type_attribute 573 | type_attribute_list type_attribute 574 ; 575 576 type_attribute_opt: 577 /* empty */ 578 | type_attribute 579 ; 580 581 type_attribute: /* See C11 6.7 declaration-specifiers */ 582 gcc_attribute 583 | T_ALIGNAS T_LPAREN align_as T_RPAREN 584 | T_PACKED { 585 addpacked(); 586 } 587 | T_NORETURN 588 ; 589 590 type_specifier: /* C99 6.7.2 */ 591 notype_type_specifier 592 | T_TYPENAME { 593 $$ = getsym($1)->s_type; 594 } 595 ; 596 597 add_notype_type_specifier: 598 notype_type_specifier { 599 add_type($1); 600 } 601 ; 602 603 /* Like type_specifier, but without typedef-name. */ 604 notype_type_specifier: 605 T_TYPE { 606 $$ = gettyp($1); 607 } 608 | T_TYPEOF term { 609 $$ = $2->tn_type; 610 } 611 | struct_or_union_specifier { 612 end_declaration_level(); 613 $$ = $1; 614 } 615 | enum_specifier { 616 end_declaration_level(); 617 $$ = $1; 618 } 619 ; 620 621 struct_or_union_specifier: /* C99 6.7.2.1 */ 622 struct_or_union identifier_sym { 623 /* 624 * STDC requires that "struct a;" always introduces 625 * a new tag if "a" is not declared at current level 626 * 627 * yychar is valid because otherwise the parser would not 628 * have been able to decide if it must shift or reduce 629 */ 630 $$ = mktag($2, $1, false, yychar == T_SEMI); 631 } 632 | struct_or_union identifier_sym { 633 dcs->d_tagtyp = mktag($2, $1, true, false); 634 } braced_struct_declaration_list { 635 $$ = complete_tag_struct_or_union(dcs->d_tagtyp, $4); 636 } 637 | struct_or_union { 638 dcs->d_tagtyp = mktag(NULL, $1, true, false); 639 } braced_struct_declaration_list { 640 $$ = complete_tag_struct_or_union(dcs->d_tagtyp, $3); 641 } 642 | struct_or_union error { 643 symtyp = FVFT; 644 $$ = gettyp(INT); 645 } 646 ; 647 648 struct_or_union: /* C99 6.7.2.1 */ 649 T_STRUCT_OR_UNION { 650 symtyp = FTAG; 651 begin_declaration_level($1 == STRUCT ? MOS : MOU); 652 dcs->d_offset = 0; 653 dcs->d_sou_align_in_bits = CHAR_SIZE; 654 } type_attribute_list_opt 655 ; 656 657 braced_struct_declaration_list: 658 T_LBRACE { 659 symtyp = FVFT; 660 } struct_declaration_list_semi T_RBRACE { 661 $$ = $3; 662 } 663 ; 664 665 struct_declaration_list_semi: 666 /* empty */ { 667 $$ = NULL; 668 } 669 | struct_declaration_list T_SEMI 670 | struct_declaration_list { 671 if (sflag) { 672 /* syntax req. ';' after last struct/union member */ 673 error(66); 674 } else { 675 /* syntax req. ';' after last struct/union member */ 676 warning(66); 677 } 678 $$ = $1; 679 } 680 ; 681 682 struct_declaration_list: 683 struct_declaration 684 | struct_declaration_list T_SEMI struct_declaration { 685 $$ = lnklst($1, $3); 686 } 687 ; 688 689 struct_declaration: 690 begin_type add_type_qualifier_list end_type { 691 /* too late, i know, but getsym() compensates it */ 692 symtyp = FMEMBER; 693 } notype_member_decls type_attribute_opt { 694 symtyp = FVFT; 695 $$ = $5; 696 } 697 | begin_type noclass_declspecs end_type { 698 symtyp = FMEMBER; 699 } type_member_decls type_attribute_opt { 700 symtyp = FVFT; 701 $$ = $5; 702 } 703 | begin_type add_type_qualifier_list end_type type_attribute_opt { 704 /* syntax error '%s' */ 705 error(249, "member without type"); 706 $$ = NULL; 707 } 708 | begin_type noclass_declspecs end_type type_attribute_opt { 709 symtyp = FVFT; 710 if (!Sflag) 711 /* anonymous struct/union members is a C9X feature */ 712 warning(49); 713 if (is_struct_or_union(dcs->d_type->t_tspec)) { 714 $$ = dcs->d_type->t_str->sou_first_member; 715 /* add all the members of the anonymous struct/union */ 716 anonymize($$); 717 } else { 718 /* syntax error '%s' */ 719 error(249, "unnamed member"); 720 $$ = NULL; 721 } 722 } 723 | error { 724 symtyp = FVFT; 725 $$ = NULL; 726 } 727 ; 728 729 noclass_declspecs: 730 noclass_declspecs_postfix 731 | type_attribute noclass_declspecs_postfix 732 ; 733 734 noclass_declspecs_postfix: 735 add_type_specifier 736 | add_type_qualifier_list add_type_specifier 737 | noclass_declspecs_postfix add_type_qualifier 738 | noclass_declspecs_postfix add_notype_type_specifier 739 | noclass_declspecs_postfix type_attribute 740 ; 741 742 add_type_qualifier_list: 743 add_type_qualifier 744 | add_type_qualifier_list add_type_qualifier 745 ; 746 747 add_type_qualifier: 748 T_QUAL { 749 add_qualifier($1); 750 } 751 ; 752 753 notype_member_decls: 754 notype_member_decl { 755 $$ = declarator_1_struct_union($1); 756 } 757 | notype_member_decls { 758 symtyp = FMEMBER; 759 } T_COMMA type_member_decl { 760 $$ = lnklst($1, declarator_1_struct_union($4)); 761 } 762 ; 763 764 type_member_decls: 765 type_member_decl { 766 $$ = declarator_1_struct_union($1); 767 } 768 | type_member_decls { 769 symtyp = FMEMBER; 770 } T_COMMA type_member_decl { 771 $$ = lnklst($1, declarator_1_struct_union($4)); 772 } 773 ; 774 775 notype_member_decl: 776 notype_decl 777 | notype_decl T_COLON constant_expr { /* C99 6.7.2.1 */ 778 $$ = bitfield($1, to_int_constant($3, true)); 779 } 780 | { 781 symtyp = FVFT; 782 } T_COLON constant_expr { /* C99 6.7.2.1 */ 783 $$ = bitfield(NULL, to_int_constant($3, true)); 784 } 785 ; 786 787 type_member_decl: 788 type_decl 789 | type_decl T_COLON constant_expr { 790 $$ = bitfield($1, to_int_constant($3, true)); 791 } 792 | { 793 symtyp = FVFT; 794 } T_COLON constant_expr { 795 $$ = bitfield(NULL, to_int_constant($3, true)); 796 } 797 ; 798 799 enum_specifier: /* C99 6.7.2.2 */ 800 enum identifier_sym { 801 $$ = mktag($2, ENUM, false, false); 802 } 803 | enum identifier_sym { 804 dcs->d_tagtyp = mktag($2, ENUM, true, false); 805 } enum_declaration { 806 $$ = complete_tag_enum(dcs->d_tagtyp, $4); 807 } 808 | enum { 809 dcs->d_tagtyp = mktag(NULL, ENUM, true, false); 810 } enum_declaration { 811 $$ = complete_tag_enum(dcs->d_tagtyp, $3); 812 } 813 | enum error { 814 symtyp = FVFT; 815 $$ = gettyp(INT); 816 } 817 ; 818 819 enum: 820 T_ENUM { 821 symtyp = FTAG; 822 begin_declaration_level(CTCONST); 823 } 824 ; 825 826 enum_declaration: 827 T_LBRACE { 828 symtyp = FVFT; 829 enumval = 0; 830 } enumerator_list enumerator_list_comma_opt T_RBRACE { 831 $$ = $3; 832 } 833 ; 834 835 enumerator_list: /* C99 6.7.2.2 */ 836 enumerator 837 | enumerator_list T_COMMA enumerator { 838 $$ = lnklst($1, $3); 839 } 840 | error { 841 $$ = NULL; 842 } 843 ; 844 845 enumerator_list_comma_opt: 846 /* empty */ 847 | T_COMMA { 848 if (sflag) { 849 /* trailing ',' prohibited in enum declaration */ 850 error(54); 851 } else { 852 /* trailing ',' prohibited in enum declaration */ 853 c99ism(54); 854 } 855 } 856 ; 857 858 enumerator: /* C99 6.7.2.2 */ 859 identifier_sym { 860 $$ = enumeration_constant($1, enumval, true); 861 } 862 | identifier_sym T_ASSIGN constant_expr { 863 $$ = enumeration_constant($1, to_int_constant($3, true), false); 864 } 865 ; 866 867 868 /* 869 * For an explanation of 'notype' in the following rules, see the Bison 870 * manual, section 7.1 "Semantic Info in Token Kinds". 871 */ 872 873 notype_init_decls: 874 notype_init_decl 875 | notype_init_decls T_COMMA type_init_decl 876 ; 877 878 type_init_decls: 879 type_init_decl 880 | type_init_decls T_COMMA type_init_decl 881 ; 882 883 notype_init_decl: 884 notype_decl asm_or_symbolrename_opt { 885 cgram_declare($1, false, $2); 886 check_size($1); 887 } 888 | notype_decl asm_or_symbolrename_opt { 889 begin_initialization($1); 890 cgram_declare($1, true, $2); 891 } T_ASSIGN initializer { 892 check_size($1); 893 end_initialization(); 894 } 895 ; 896 897 type_init_decl: 898 type_decl asm_or_symbolrename_opt { 899 cgram_declare($1, false, $2); 900 check_size($1); 901 } 902 | type_decl asm_or_symbolrename_opt { 903 begin_initialization($1); 904 cgram_declare($1, true, $2); 905 } T_ASSIGN initializer { 906 check_size($1); 907 end_initialization(); 908 } 909 ; 910 911 notype_decl: 912 /* TODO: removing type_attribute_list_opt here removes another 18 conflicts */ 913 type_attribute_list_opt notype_direct_decl { 914 $$ = $2; 915 } 916 | pointer type_attribute_list_opt notype_direct_decl { 917 $$ = add_pointer($3, $1); 918 } 919 ; 920 921 type_decl: 922 /* TODO: removing type_attribute_list_opt here removes another 16 conflicts */ 923 type_attribute_list_opt type_direct_decl { 924 $$ = $2; 925 } 926 | pointer type_attribute_list_opt type_direct_decl { 927 $$ = add_pointer($3, $1); 928 } 929 ; 930 931 notype_direct_decl: 932 T_NAME { 933 $$ = declarator_name(getsym($1)); 934 } 935 | T_LPAREN type_decl T_RPAREN { 936 $$ = $2; 937 } 938 | notype_direct_decl T_LBRACK T_RBRACK { 939 $$ = add_array($1, false, 0); 940 } 941 | notype_direct_decl T_LBRACK array_size T_RBRACK { 942 $$ = add_array($1, true, to_int_constant($3, false)); 943 } 944 | notype_direct_decl param_list asm_or_symbolrename_opt { 945 $$ = add_function(symbolrename($1, $3), $2); 946 end_declaration_level(); 947 block_level--; 948 } 949 | notype_direct_decl type_attribute 950 ; 951 952 type_direct_decl: 953 identifier { 954 $$ = declarator_name(getsym($1)); 955 } 956 | T_LPAREN type_decl T_RPAREN { 957 $$ = $2; 958 } 959 | type_direct_decl T_LBRACK T_RBRACK { 960 $$ = add_array($1, false, 0); 961 } 962 | type_direct_decl T_LBRACK array_size T_RBRACK { 963 $$ = add_array($1, true, to_int_constant($3, false)); 964 } 965 | type_direct_decl param_list asm_or_symbolrename_opt { 966 $$ = add_function(symbolrename($1, $3), $2); 967 end_declaration_level(); 968 block_level--; 969 } 970 | type_direct_decl type_attribute 971 ; 972 973 /* 974 * The two distinct rules type_param_decl and notype_param_decl avoid a 975 * conflict in argument lists. A typename enclosed in parentheses is always 976 * treated as a typename, not an argument name. For example, after 977 * "typedef double a;", the declaration "f(int (a));" is interpreted as 978 * "f(int (double));", not "f(int a);". 979 */ 980 type_param_decl: 981 direct_param_decl 982 | pointer direct_param_decl { 983 $$ = add_pointer($2, $1); 984 } 985 ; 986 987 notype_param_decl: 988 direct_notype_param_decl 989 | pointer direct_notype_param_decl { 990 $$ = add_pointer($2, $1); 991 } 992 ; 993 994 direct_param_decl: 995 identifier type_attribute_list_opt { 996 $$ = declarator_name(getsym($1)); 997 } 998 | T_LPAREN notype_param_decl T_RPAREN { 999 $$ = $2; 1000 } 1001 | direct_param_decl T_LBRACK T_RBRACK { 1002 $$ = add_array($1, false, 0); 1003 } 1004 | direct_param_decl T_LBRACK array_size T_RBRACK { 1005 $$ = add_array($1, true, to_int_constant($3, false)); 1006 } 1007 | direct_param_decl param_list asm_or_symbolrename_opt { 1008 $$ = add_function(symbolrename($1, $3), $2); 1009 end_declaration_level(); 1010 block_level--; 1011 } 1012 ; 1013 1014 direct_notype_param_decl: 1015 identifier /* XXX: missing type_attribute_list_opt? */ { 1016 $$ = declarator_name(getsym($1)); 1017 } 1018 | T_LPAREN notype_param_decl T_RPAREN { 1019 $$ = $2; 1020 } 1021 | direct_notype_param_decl T_LBRACK T_RBRACK { 1022 $$ = add_array($1, false, 0); 1023 } 1024 | direct_notype_param_decl T_LBRACK array_size T_RBRACK { 1025 $$ = add_array($1, true, to_int_constant($3, false)); 1026 } 1027 | direct_notype_param_decl param_list asm_or_symbolrename_opt { 1028 $$ = add_function(symbolrename($1, $3), $2); 1029 end_declaration_level(); 1030 block_level--; 1031 } 1032 ; 1033 1034 pointer: /* C99 6.7.5 */ 1035 asterisk type_qualifier_list_opt { 1036 $$ = merge_qualified_pointer($1, $2); 1037 } 1038 | asterisk type_qualifier_list_opt pointer { 1039 $$ = merge_qualified_pointer($1, $2); 1040 $$ = merge_qualified_pointer($$, $3); 1041 } 1042 ; 1043 1044 asterisk: 1045 T_ASTERISK { 1046 $$ = xcalloc(1, sizeof(*$$)); 1047 $$->p_pointer = true; 1048 } 1049 ; 1050 1051 type_qualifier_list_opt: 1052 /* empty */ { 1053 $$ = NULL; 1054 } 1055 | type_qualifier_list 1056 ; 1057 1058 type_qualifier_list: /* C99 6.7.5 */ 1059 type_qualifier 1060 | type_qualifier_list type_qualifier { 1061 $$ = merge_qualified_pointer($1, $2); 1062 } 1063 ; 1064 1065 type_qualifier: 1066 T_QUAL { 1067 $$ = xcalloc(1, sizeof(*$$)); 1068 if ($1 == CONST) { 1069 $$->p_const = true; 1070 } else if ($1 == VOLATILE) { 1071 $$->p_volatile = true; 1072 } else { 1073 lint_assert($1 == RESTRICT || $1 == THREAD); 1074 } 1075 } 1076 ; 1077 1078 align_as: /* See alignment-specifier in C11 6.7.5 */ 1079 type_specifier 1080 | constant_expr 1081 ; 1082 1083 param_list: 1084 id_list_lparen identifier_list T_RPAREN { 1085 $$ = $2; 1086 } 1087 | abstract_decl_param_list 1088 ; 1089 1090 id_list_lparen: 1091 T_LPAREN { 1092 block_level++; 1093 begin_declaration_level(PROTO_ARG); 1094 } 1095 ; 1096 1097 identifier_list: 1098 T_NAME { 1099 $$ = old_style_function_name(getsym($1)); 1100 } 1101 | identifier_list T_COMMA T_NAME { 1102 $$ = lnklst($1, old_style_function_name(getsym($3))); 1103 } 1104 | identifier_list error 1105 ; 1106 1107 abstract_decl_param_list: 1108 abstract_decl_lparen T_RPAREN type_attribute_opt { 1109 $$ = NULL; 1110 } 1111 | abstract_decl_lparen vararg_parameter_type_list T_RPAREN type_attribute_opt { 1112 dcs->d_proto = true; 1113 $$ = $2; 1114 } 1115 | abstract_decl_lparen error T_RPAREN type_attribute_opt { 1116 $$ = NULL; 1117 } 1118 ; 1119 1120 abstract_decl_lparen: 1121 T_LPAREN { 1122 block_level++; 1123 begin_declaration_level(PROTO_ARG); 1124 } 1125 ; 1126 1127 vararg_parameter_type_list: 1128 parameter_type_list 1129 | parameter_type_list T_COMMA T_ELLIPSIS { 1130 dcs->d_vararg = true; 1131 $$ = $1; 1132 } 1133 | T_ELLIPSIS { 1134 if (sflag) { 1135 /* ANSI C requires formal parameter before '...' */ 1136 error(84); 1137 } else if (!tflag) { 1138 /* ANSI C requires formal parameter before '...' */ 1139 warning(84); 1140 } 1141 dcs->d_vararg = true; 1142 $$ = NULL; 1143 } 1144 ; 1145 1146 parameter_type_list: 1147 parameter_declaration 1148 | parameter_type_list T_COMMA parameter_declaration { 1149 $$ = lnklst($1, $3); 1150 } 1151 ; 1152 1153 /* XXX: C99 6.7.5 defines the same name, but it looks completely different. */ 1154 parameter_declaration: 1155 begin_type declmods end_type { 1156 $$ = declare_argument(abstract_name(), false); 1157 } 1158 | begin_type declaration_specifiers end_type { 1159 $$ = declare_argument(abstract_name(), false); 1160 } 1161 | begin_type declmods end_type notype_param_decl { 1162 $$ = declare_argument($4, false); 1163 } 1164 | begin_type declaration_specifiers end_type type_param_decl { 1165 $$ = declare_argument($4, false); 1166 } 1167 | begin_type declmods end_type abstract_declarator { 1168 $$ = declare_argument($4, false); 1169 } 1170 | begin_type declaration_specifiers end_type abstract_declarator { 1171 $$ = declare_argument($4, false); 1172 } 1173 ; 1174 1175 asm_or_symbolrename_opt: /* expect only one */ 1176 /* empty */ { 1177 $$ = NULL; 1178 } 1179 | T_ASM T_LPAREN T_STRING T_RPAREN { 1180 freeyyv(&$3, T_STRING); 1181 $$ = NULL; 1182 } 1183 | T_SYMBOLRENAME T_LPAREN T_NAME T_RPAREN { 1184 $$ = $3; 1185 } 1186 ; 1187 1188 initializer: /* C99 6.7.8 "Initialization" */ 1189 expr %prec T_COMMA { 1190 init_expr($1); 1191 } 1192 | init_lbrace init_rbrace { 1193 /* XXX: Empty braces are not covered by C99 6.7.8. */ 1194 } 1195 | init_lbrace initializer_list comma_opt init_rbrace 1196 | error 1197 ; 1198 1199 initializer_list: /* C99 6.7.8 "Initialization" */ 1200 initializer_list_item 1201 | initializer_list T_COMMA initializer_list_item 1202 ; 1203 1204 initializer_list_item: 1205 designation initializer 1206 | initializer 1207 ; 1208 1209 designation: /* C99 6.7.8 "Initialization" */ 1210 designator_list T_ASSIGN 1211 | identifier T_COLON { 1212 /* GCC style struct or union member name in initializer */ 1213 gnuism(315); 1214 add_designator_member($1); 1215 } 1216 ; 1217 1218 designator_list: /* C99 6.7.8 "Initialization" */ 1219 designator 1220 | designator_list designator 1221 ; 1222 1223 designator: /* C99 6.7.8 "Initialization" */ 1224 T_LBRACK range T_RBRACK { 1225 add_designator_subscript($2); 1226 if (!Sflag) 1227 /* array initializer with des.s is a C9X feature */ 1228 warning(321); 1229 } 1230 | T_POINT identifier { 1231 if (!Sflag) 1232 /* struct or union member name in initializer is ... */ 1233 warning(313); 1234 add_designator_member($2); 1235 } 1236 ; 1237 1238 range: 1239 constant_expr { 1240 $$.lo = to_int_constant($1, true); 1241 $$.hi = $$.lo; 1242 } 1243 | constant_expr T_ELLIPSIS constant_expr { 1244 $$.lo = to_int_constant($1, true); 1245 $$.hi = to_int_constant($3, true); 1246 /* initialization with '[a...b]' is a GCC extension */ 1247 gnuism(340); 1248 } 1249 ; 1250 1251 init_lbrace: 1252 T_LBRACE { 1253 init_lbrace(); 1254 } 1255 ; 1256 1257 init_rbrace: 1258 T_RBRACE { 1259 init_rbrace(); 1260 } 1261 ; 1262 1263 type_name: /* C99 6.7.6 */ 1264 { 1265 begin_declaration_level(ABSTRACT); 1266 } abstract_declaration { 1267 end_declaration_level(); 1268 $$ = $2->s_type; 1269 } 1270 ; 1271 1272 abstract_declaration: 1273 begin_type add_type_qualifier_list end_type { 1274 $$ = declare_1_abstract(abstract_name()); 1275 } 1276 | begin_type noclass_declspecs end_type { 1277 $$ = declare_1_abstract(abstract_name()); 1278 } 1279 | begin_type add_type_qualifier_list end_type abstract_declarator { 1280 $$ = declare_1_abstract($4); 1281 } 1282 | begin_type noclass_declspecs end_type abstract_declarator { 1283 $$ = declare_1_abstract($4); 1284 } 1285 ; 1286 1287 abstract_declarator: /* C99 6.7.6 */ 1288 pointer { 1289 $$ = add_pointer(abstract_name(), $1); 1290 } 1291 | direct_abstract_declarator 1292 | pointer direct_abstract_declarator { 1293 $$ = add_pointer($2, $1); 1294 } 1295 | T_TYPEOF term { /* GCC extension */ 1296 $$ = mktempsym($2->tn_type); 1297 } 1298 ; 1299 1300 direct_abstract_declarator: /* C99 6.7.6 */ 1301 direct_abstract_declarator_postfix 1302 | type_attribute direct_abstract_declarator_postfix { 1303 $$ = $2; 1304 } 1305 ; 1306 1307 direct_abstract_declarator_postfix: /* C99 6.7.6 */ 1308 T_LPAREN abstract_declarator T_RPAREN { 1309 $$ = $2; 1310 } 1311 | T_LBRACK T_RBRACK { 1312 $$ = add_array(abstract_name(), false, 0); 1313 } 1314 | T_LBRACK array_size T_RBRACK { 1315 $$ = add_array(abstract_name(), true, to_int_constant($2, false)); 1316 } 1317 | direct_abstract_declarator_postfix T_LBRACK T_RBRACK { 1318 $$ = add_array($1, false, 0); 1319 } 1320 | direct_abstract_declarator_postfix 1321 T_LBRACK T_ASTERISK T_RBRACK { /* C99 */ 1322 $$ = add_array($1, false, 0); 1323 } 1324 | direct_abstract_declarator_postfix T_LBRACK array_size T_RBRACK { 1325 $$ = add_array($1, true, to_int_constant($3, false)); 1326 } 1327 | abstract_decl_param_list asm_or_symbolrename_opt { 1328 $$ = add_function(symbolrename(abstract_name(), $2), $1); 1329 end_declaration_level(); 1330 block_level--; 1331 } 1332 | direct_abstract_declarator_postfix abstract_decl_param_list 1333 asm_or_symbolrename_opt { 1334 $$ = add_function(symbolrename($1, $3), $2); 1335 end_declaration_level(); 1336 block_level--; 1337 } 1338 | direct_abstract_declarator_postfix type_attribute 1339 ; 1340 1341 array_size: 1342 type_qualifier_list_opt T_SCLASS constant_expr { 1343 /* C11 6.7.6.3p7 */ 1344 if ($2 != STATIC) 1345 yyerror("Bad attribute"); 1346 /* static array size is a C11 extension */ 1347 c11ism(343); 1348 $$ = $3; 1349 } 1350 | constant_expr 1351 ; 1352 1353 non_expr_statement: 1354 gcc_attribute T_SEMI 1355 | labeled_statement 1356 | compound_statement 1357 | selection_statement 1358 | iteration_statement 1359 | jump_statement { 1360 seen_fallthrough = false; 1361 } 1362 | asm_statement 1363 ; 1364 1365 statement: /* C99 6.8 */ 1366 expression_statement 1367 | non_expr_statement 1368 ; 1369 1370 labeled_statement: /* C99 6.8.1 */ 1371 label gcc_attribute_list_opt statement 1372 ; 1373 1374 label: 1375 T_NAME T_COLON { 1376 symtyp = FLABEL; 1377 named_label(getsym($1)); 1378 } 1379 | T_CASE constant_expr T_COLON { 1380 case_label($2); 1381 seen_fallthrough = true; 1382 } 1383 | T_CASE constant_expr T_ELLIPSIS constant_expr T_COLON { 1384 /* XXX: We don't fill all cases */ 1385 case_label($2); 1386 seen_fallthrough = true; 1387 } 1388 | T_DEFAULT T_COLON { 1389 default_label(); 1390 seen_fallthrough = true; 1391 } 1392 ; 1393 1394 compound_statement: /* C99 6.8.2 */ 1395 compound_statement_lbrace block_item_list_opt 1396 compound_statement_rbrace 1397 ; 1398 1399 compound_statement_lbrace: 1400 T_LBRACE { 1401 block_level++; 1402 mem_block_level++; 1403 begin_declaration_level(AUTO); 1404 } 1405 ; 1406 1407 compound_statement_rbrace: 1408 T_RBRACE { 1409 end_declaration_level(); 1410 freeblk(); 1411 mem_block_level--; 1412 block_level--; 1413 seen_fallthrough = false; 1414 } 1415 ; 1416 1417 block_item_list_opt: /* C99 6.8.2 */ 1418 /* empty */ 1419 | block_item_list 1420 ; 1421 1422 block_item_list: /* C99 6.8.2 */ 1423 block_item 1424 | block_item_list block_item { 1425 if (!Sflag && $1 && !$2) 1426 /* declarations after statements is a C99 feature */ 1427 c99ism(327); 1428 $$ = $1 || $2; 1429 } 1430 ; 1431 1432 block_item: /* C99 6.8.2 */ 1433 declaration { 1434 $$ = false; 1435 restore_warning_flags(); 1436 } 1437 | statement { 1438 $$ = true; 1439 restore_warning_flags(); 1440 } 1441 ; 1442 1443 expression_statement: /* C99 6.8.3 */ 1444 expr T_SEMI { 1445 expr($1, false, false, false, false); 1446 seen_fallthrough = false; 1447 } 1448 | T_SEMI { 1449 seen_fallthrough = false; 1450 } 1451 ; 1452 1453 selection_statement: /* C99 6.8.4 */ 1454 if_without_else { 1455 save_warning_flags(); 1456 if2(); 1457 if3(false); 1458 } 1459 | if_without_else T_ELSE { 1460 save_warning_flags(); 1461 if2(); 1462 } statement { 1463 clear_warning_flags(); 1464 if3(true); 1465 } 1466 | if_without_else T_ELSE error { 1467 clear_warning_flags(); 1468 if3(false); 1469 } 1470 | switch_expr statement { 1471 clear_warning_flags(); 1472 switch2(); 1473 } 1474 | switch_expr error { 1475 clear_warning_flags(); 1476 switch2(); 1477 } 1478 ; 1479 1480 if_without_else: /* see C99 6.8.4 */ 1481 if_expr statement 1482 | if_expr error 1483 ; 1484 1485 if_expr: /* see C99 6.8.4 */ 1486 T_IF T_LPAREN expr T_RPAREN { 1487 if1($3); 1488 clear_warning_flags(); 1489 } 1490 ; 1491 1492 switch_expr: /* see C99 6.8.4 */ 1493 T_SWITCH T_LPAREN expr T_RPAREN { 1494 switch1($3); 1495 clear_warning_flags(); 1496 } 1497 ; 1498 1499 iteration_statement: /* C99 6.8.5 */ 1500 T_WHILE T_LPAREN expr T_RPAREN { 1501 while1($3); 1502 clear_warning_flags(); 1503 } iteration_body { 1504 clear_warning_flags(); 1505 while2(); 1506 } 1507 | do statement { 1508 clear_warning_flags(); 1509 } T_WHILE T_LPAREN expr T_RPAREN T_SEMI { 1510 do2($6); 1511 seen_fallthrough = false; 1512 } 1513 | do error { 1514 clear_warning_flags(); 1515 do2(NULL); 1516 } 1517 | for_exprs iteration_body { 1518 clear_warning_flags(); 1519 for2(); 1520 end_declaration_level(); 1521 block_level--; 1522 } 1523 ; 1524 1525 iteration_body: 1526 statement 1527 | error 1528 ; 1529 1530 do: /* see C99 6.8.5 */ 1531 T_DO { 1532 do1(); 1533 } 1534 ; 1535 1536 for_start: /* see C99 6.8.5 */ 1537 T_FOR T_LPAREN { 1538 begin_declaration_level(AUTO); 1539 block_level++; 1540 } 1541 ; 1542 1543 for_exprs: /* see C99 6.8.5 */ 1544 for_start 1545 begin_type declaration_specifiers end_type notype_init_decls T_SEMI 1546 expr_opt T_SEMI 1547 expr_opt T_RPAREN { 1548 /* variable declaration in for loop */ 1549 c99ism(325); 1550 for1(NULL, $7, $9); 1551 clear_warning_flags(); 1552 } 1553 | for_start expr_opt T_SEMI expr_opt T_SEMI expr_opt T_RPAREN { 1554 for1($2, $4, $6); 1555 clear_warning_flags(); 1556 } 1557 ; 1558 1559 jump_statement: /* C99 6.8.6 */ 1560 goto identifier T_SEMI { 1561 do_goto(getsym($2)); 1562 } 1563 | goto error T_SEMI { 1564 symtyp = FVFT; 1565 } 1566 | T_CONTINUE T_SEMI { 1567 do_continue(); 1568 } 1569 | T_BREAK T_SEMI { 1570 do_break(); 1571 } 1572 | T_RETURN T_SEMI { 1573 do_return(NULL); 1574 } 1575 | T_RETURN expr T_SEMI { 1576 do_return($2); 1577 } 1578 ; 1579 1580 goto: 1581 T_GOTO { 1582 symtyp = FLABEL; 1583 } 1584 ; 1585 1586 asm_statement: 1587 T_ASM T_LPAREN read_until_rparen T_SEMI { 1588 setasm(); 1589 } 1590 | T_ASM T_QUAL T_LPAREN read_until_rparen T_SEMI { 1591 setasm(); 1592 } 1593 | T_ASM error 1594 ; 1595 1596 read_until_rparen: 1597 /* empty */ { 1598 ignore_up_to_rparen(); 1599 } 1600 ; 1601 1602 constant_expr_list_opt: 1603 /* empty */ 1604 | constant_expr_list 1605 ; 1606 1607 constant_expr_list: 1608 constant_expr 1609 | constant_expr_list T_COMMA constant_expr 1610 ; 1611 1612 constant_expr: /* C99 6.6 */ 1613 expr %prec T_ASSIGN 1614 ; 1615 1616 expr_opt: 1617 /* empty */ { 1618 $$ = NULL; 1619 } 1620 | expr 1621 ; 1622 1623 expr: /* C99 6.5 */ 1624 expr T_ASTERISK expr { 1625 $$ = build(MULT, $1, $3); 1626 } 1627 | expr T_MULTIPLICATIVE expr { 1628 $$ = build($2, $1, $3); 1629 } 1630 | expr T_ADDITIVE expr { 1631 $$ = build($2, $1, $3); 1632 } 1633 | expr T_SHIFT expr { 1634 $$ = build($2, $1, $3); 1635 } 1636 | expr T_RELATIONAL expr { 1637 $$ = build($2, $1, $3); 1638 } 1639 | expr T_EQUALITY expr { 1640 $$ = build($2, $1, $3); 1641 } 1642 | expr T_AMPER expr { 1643 $$ = build(BITAND, $1, $3); 1644 } 1645 | expr T_BITXOR expr { 1646 $$ = build(BITXOR, $1, $3); 1647 } 1648 | expr T_BITOR expr { 1649 $$ = build(BITOR, $1, $3); 1650 } 1651 | expr T_LOGAND expr { 1652 $$ = build(LOGAND, $1, $3); 1653 } 1654 | expr T_LOGOR expr { 1655 $$ = build(LOGOR, $1, $3); 1656 } 1657 | expr T_QUEST expr T_COLON expr { 1658 $$ = build(QUEST, $1, build(COLON, $3, $5)); 1659 } 1660 | expr T_ASSIGN expr { 1661 $$ = build(ASSIGN, $1, $3); 1662 } 1663 | expr T_OPASSIGN expr { 1664 $$ = build($2, $1, $3); 1665 } 1666 | expr T_COMMA expr { 1667 $$ = build(COMMA, $1, $3); 1668 } 1669 | term 1670 | generic_selection 1671 ; 1672 1673 assignment_expression: /* C99 6.5.16 */ 1674 expr %prec T_ASSIGN 1675 ; 1676 1677 term: /* see C99 6.5.1 */ 1678 T_NAME { 1679 /* XXX really necessary? */ 1680 if (yychar < 0) 1681 yychar = yylex(); 1682 $$ = new_name_node(getsym($1), yychar); 1683 } 1684 | string { 1685 $$ = new_string_node($1); 1686 } 1687 | T_CON { 1688 $$ = expr_new_constant(gettyp($1->v_tspec), $1); 1689 } 1690 | T_LPAREN expr T_RPAREN { 1691 if ($2 != NULL) 1692 $2->tn_parenthesized = true; 1693 $$ = $2; 1694 } 1695 | T_LPAREN compound_statement_lbrace gcc_statement_expr_list { 1696 block_level--; 1697 mem_block_level--; 1698 begin_initialization(mktempsym(dup_type($3->tn_type))); 1699 mem_block_level++; 1700 block_level++; 1701 /* ({ }) is a GCC extension */ 1702 gnuism(320); 1703 } compound_statement_rbrace T_RPAREN { 1704 $$ = new_name_node(*current_initsym(), 0); 1705 end_initialization(); 1706 } 1707 | term T_INCDEC { 1708 $$ = build($2 == INC ? INCAFT : DECAFT, $1, NULL); 1709 } 1710 | T_INCDEC term { 1711 $$ = build($1 == INC ? INCBEF : DECBEF, $2, NULL); 1712 } 1713 | T_ASTERISK term { 1714 $$ = build(INDIR, $2, NULL); 1715 } 1716 | T_AMPER term { 1717 $$ = build(ADDR, $2, NULL); 1718 } 1719 | T_UNARY term { 1720 $$ = build($1, $2, NULL); 1721 } 1722 | T_ADDITIVE term { 1723 if (tflag && $1 == PLUS) { 1724 /* unary + is illegal in traditional C */ 1725 warning(100); 1726 } 1727 $$ = build($1 == PLUS ? UPLUS : UMINUS, $2, NULL); 1728 } 1729 | term T_LBRACK expr T_RBRACK { 1730 $$ = build(INDIR, build(PLUS, $1, $3), NULL); 1731 } 1732 | term T_LPAREN T_RPAREN { 1733 $$ = new_function_call_node($1, NULL); 1734 } 1735 | term T_LPAREN argument_expression_list T_RPAREN { 1736 $$ = new_function_call_node($1, $3); 1737 } 1738 | term point_or_arrow T_NAME { 1739 if ($1 != NULL) { 1740 sym_t *msym; 1741 /* 1742 * XXX struct_or_union_member should be integrated 1743 * in build() 1744 */ 1745 if ($2 == ARROW) { 1746 /* 1747 * must do this before struct_or_union_member 1748 * is called 1749 */ 1750 $1 = cconv($1); 1751 } 1752 msym = struct_or_union_member($1, $2, getsym($3)); 1753 $$ = build($2, $1, new_name_node(msym, 0)); 1754 } else { 1755 $$ = NULL; 1756 } 1757 } 1758 | T_REAL term { 1759 $$ = build(REAL, $2, NULL); 1760 } 1761 | T_IMAG term { 1762 $$ = build(IMAG, $2, NULL); 1763 } 1764 | T_EXTENSION term { 1765 $$ = $2; 1766 } 1767 | T_BUILTIN_OFFSETOF T_LPAREN type_name T_COMMA identifier T_RPAREN { 1768 symtyp = FMEMBER; 1769 $$ = build_offsetof($3, getsym($5)); 1770 } 1771 | T_SIZEOF term { 1772 $$ = $2 == NULL ? NULL : build_sizeof($2->tn_type); 1773 if ($$ != NULL) 1774 check_expr_misc($2, false, false, false, false, false, true); 1775 } 1776 | T_SIZEOF T_LPAREN type_name T_RPAREN %prec T_SIZEOF { 1777 $$ = build_sizeof($3); 1778 } 1779 | T_ALIGNOF T_LPAREN type_name T_RPAREN { 1780 $$ = build_alignof($3); 1781 } 1782 | T_LPAREN type_name T_RPAREN term %prec T_UNARY { 1783 $$ = cast($4, $2); 1784 } 1785 | T_LPAREN type_name T_RPAREN { /* C99 6.5.2.5 "Compound literals" */ 1786 sym_t *tmp = mktempsym($2); 1787 begin_initialization(tmp); 1788 cgram_declare(tmp, true, NULL); 1789 } init_lbrace initializer_list comma_opt init_rbrace { 1790 if (!Sflag) 1791 /* compound literals are a C9X/GCC extension */ 1792 gnuism(319); 1793 $$ = new_name_node(*current_initsym(), 0); 1794 end_initialization(); 1795 } 1796 ; 1797 1798 generic_selection: /* C11 6.5.1.1 */ 1799 T_GENERIC T_LPAREN assignment_expression T_COMMA 1800 generic_assoc_list T_RPAREN { 1801 /* generic selection requires C11 or later */ 1802 c11ism(345); 1803 $$ = build_generic_selection($3, $5); 1804 } 1805 ; 1806 1807 generic_assoc_list: /* C11 6.5.1.1 */ 1808 generic_association 1809 | generic_assoc_list T_COMMA generic_association { 1810 $3->ga_prev = $1; 1811 $$ = $3; 1812 } 1813 ; 1814 1815 generic_association: /* C11 6.5.1.1 */ 1816 type_name T_COLON assignment_expression { 1817 $$ = getblk(sizeof(*$$)); 1818 $$->ga_arg = $1; 1819 $$->ga_result = $3; 1820 } 1821 | T_DEFAULT T_COLON assignment_expression { 1822 $$ = getblk(sizeof(*$$)); 1823 $$->ga_arg = NULL; 1824 $$->ga_result = $3; 1825 } 1826 ; 1827 1828 argument_expression_list: /* C99 6.5.2 */ 1829 expr %prec T_COMMA { 1830 $$ = new_function_argument_node(NULL, $1); 1831 } 1832 | argument_expression_list T_COMMA expr { 1833 $$ = new_function_argument_node($1, $3); 1834 } 1835 ; 1836 1837 /* 1838 * The inner part of a GCC statement-expression of the form ({ ... }). 1839 * 1840 * https://gcc.gnu.org/onlinedocs/gcc/Statement-Exprs.html 1841 */ 1842 gcc_statement_expr_list: 1843 gcc_statement_expr_item 1844 | gcc_statement_expr_list gcc_statement_expr_item { 1845 $$ = $2; 1846 } 1847 ; 1848 1849 gcc_statement_expr_item: 1850 declaration { 1851 clear_warning_flags(); 1852 $$ = NULL; 1853 } 1854 | non_expr_statement { 1855 $$ = expr_zalloc_tnode(); 1856 $$->tn_type = gettyp(VOID); 1857 } 1858 | expr T_SEMI { 1859 if ($1 == NULL) { /* in case of syntax errors */ 1860 $$ = expr_zalloc_tnode(); 1861 $$->tn_type = gettyp(VOID); 1862 } else { 1863 /* XXX: do that only on the last name */ 1864 if ($1->tn_op == NAME) 1865 $1->tn_sym->s_used = true; 1866 $$ = $1; 1867 expr($1, false, false, false, false); 1868 seen_fallthrough = false; 1869 } 1870 } 1871 ; 1872 1873 string: 1874 T_STRING 1875 | T_STRING string2 { 1876 $$ = cat_strings($1, $2); 1877 } 1878 ; 1879 1880 string2: 1881 T_STRING { 1882 if (tflag) { 1883 /* concatenated strings are illegal in traditional C */ 1884 warning(219); 1885 } 1886 $$ = $1; 1887 } 1888 | string2 T_STRING { 1889 $$ = cat_strings($1, $2); 1890 } 1891 ; 1892 1893 point_or_arrow: 1894 T_POINT { 1895 symtyp = FMEMBER; 1896 $$ = POINT; 1897 } 1898 | T_ARROW { 1899 symtyp = FMEMBER; 1900 $$ = ARROW; 1901 } 1902 ; 1903 1904 identifier_sym: 1905 identifier { 1906 $$ = getsym($1); 1907 } 1908 ; 1909 1910 identifier: /* C99 6.4.2.1 */ 1911 T_NAME { 1912 $$ = $1; 1913 cgram_debug("name '%s'", $$->sb_name); 1914 } 1915 | T_TYPENAME { 1916 $$ = $1; 1917 cgram_debug("typename '%s'", $$->sb_name); 1918 } 1919 ; 1920 1921 comma_opt: 1922 /* empty */ 1923 | T_COMMA 1924 ; 1925 1926 /* GCC extensions */ 1927 1928 gcc_attribute_list_opt: 1929 /* empty */ 1930 | gcc_attribute_list 1931 ; 1932 1933 gcc_attribute_list: 1934 gcc_attribute 1935 | gcc_attribute_list gcc_attribute 1936 ; 1937 1938 /* https://gcc.gnu.org/onlinedocs/gcc/Attribute-Syntax.html */ 1939 gcc_attribute: 1940 T_ATTRIBUTE T_LPAREN T_LPAREN { 1941 attron = true; 1942 } gcc_attribute_spec_list { 1943 attron = false; 1944 } T_RPAREN T_RPAREN 1945 ; 1946 1947 gcc_attribute_spec_list: 1948 gcc_attribute_spec 1949 | gcc_attribute_spec_list T_COMMA gcc_attribute_spec 1950 ; 1951 1952 gcc_attribute_spec: 1953 /* empty */ 1954 | T_AT_ALWAYS_INLINE 1955 | T_AT_ALIAS T_LPAREN string T_RPAREN 1956 | T_AT_ALIGNED T_LPAREN constant_expr T_RPAREN 1957 | T_AT_ALIGNED 1958 | T_AT_ALLOC_SIZE T_LPAREN constant_expr T_COMMA constant_expr T_RPAREN 1959 | T_AT_ALLOC_SIZE T_LPAREN constant_expr T_RPAREN 1960 | T_AT_BOUNDED T_LPAREN gcc_attribute_bounded 1961 T_COMMA constant_expr T_COMMA constant_expr T_RPAREN 1962 | T_AT_COLD 1963 | T_AT_COMMON 1964 | T_AT_CONSTRUCTOR T_LPAREN constant_expr T_RPAREN 1965 | T_AT_CONSTRUCTOR 1966 | T_AT_DEPRECATED T_LPAREN string T_RPAREN 1967 | T_AT_DEPRECATED 1968 | T_AT_DESTRUCTOR T_LPAREN constant_expr T_RPAREN 1969 | T_AT_DESTRUCTOR 1970 | T_AT_FALLTHROUGH { 1971 fallthru(1); 1972 } 1973 | T_AT_FORMAT T_LPAREN gcc_attribute_format T_COMMA 1974 constant_expr T_COMMA constant_expr T_RPAREN 1975 | T_AT_FORMAT_ARG T_LPAREN constant_expr T_RPAREN 1976 | T_AT_GNU_INLINE 1977 | T_AT_MALLOC 1978 | T_AT_MAY_ALIAS 1979 | T_AT_MODE T_LPAREN T_NAME T_RPAREN 1980 | T_AT_NOINLINE 1981 | T_AT_NONNULL T_LPAREN constant_expr_list_opt T_RPAREN 1982 | T_AT_NONNULL 1983 | T_AT_NONSTRING 1984 | T_AT_NORETURN 1985 | T_AT_NOTHROW 1986 | T_AT_NO_INSTRUMENT_FUNCTION 1987 | T_AT_OPTIMIZE T_LPAREN string T_RPAREN 1988 | T_AT_PACKED { 1989 addpacked(); 1990 } 1991 | T_AT_PCS T_LPAREN string T_RPAREN 1992 | T_AT_PURE 1993 | T_AT_RETURNS_TWICE 1994 | T_AT_SECTION T_LPAREN string T_RPAREN 1995 | T_AT_SENTINEL T_LPAREN constant_expr T_RPAREN 1996 | T_AT_SENTINEL 1997 | T_AT_TLS_MODEL T_LPAREN string T_RPAREN 1998 | T_AT_TUNION 1999 | T_AT_UNUSED { 2000 add_attr_used(); 2001 } 2002 | T_AT_USED { 2003 add_attr_used(); 2004 } 2005 | T_AT_VISIBILITY T_LPAREN constant_expr T_RPAREN 2006 | T_AT_WARN_UNUSED_RESULT 2007 | T_AT_WEAK 2008 | T_QUAL { 2009 if ($1 != CONST) 2010 yyerror("Bad attribute"); 2011 } 2012 ; 2013 2014 gcc_attribute_bounded: 2015 T_AT_MINBYTES 2016 | T_AT_STRING 2017 | T_AT_BUFFER 2018 ; 2019 2020 gcc_attribute_format: 2021 T_AT_FORMAT_GNU_PRINTF 2022 | T_AT_FORMAT_PRINTF 2023 | T_AT_FORMAT_SCANF 2024 | T_AT_FORMAT_STRFMON 2025 | T_AT_FORMAT_STRFTIME 2026 | T_AT_FORMAT_SYSLOG 2027 ; 2028 2029 %% 2030 2031 /* ARGSUSED */ 2032 int 2033 yyerror(const char *msg) 2034 { 2035 /* syntax error '%s' */ 2036 error(249, yytext); 2037 if (++sytxerr >= 5) 2038 norecover(); 2039 return 0; 2040 } 2041 2042 static void 2043 cgram_declare(sym_t *decl, bool initflg, sbuf_t *renaming) 2044 { 2045 declare(decl, initflg, renaming); 2046 if (renaming != NULL) 2047 freeyyv(&renaming, T_NAME); 2048 } 2049 2050 /* 2051 * Discard all input tokens up to and including the next 2052 * unmatched right paren 2053 */ 2054 static void 2055 ignore_up_to_rparen(void) 2056 { 2057 int level; 2058 2059 if (yychar < 0) 2060 yychar = yylex(); 2061 freeyyv(&yylval, yychar); 2062 2063 level = 1; 2064 while (yychar != T_RPAREN || --level > 0) { 2065 if (yychar == T_LPAREN) { 2066 level++; 2067 } else if (yychar <= 0) { 2068 break; 2069 } 2070 freeyyv(&yylval, yychar = yylex()); 2071 } 2072 2073 yyclearin; 2074 } 2075 2076 static sym_t * 2077 symbolrename(sym_t *s, sbuf_t *sb) 2078 { 2079 if (sb != NULL) 2080 s->s_rename = sb->sb_name; 2081 return s; 2082 } 2083
Indexes created Fri Oct 03 02:09:57 GMT 2025