cgram.y revision 1.299
1 %{ 2 /* $NetBSD: cgram.y,v 1.299 2021/07/10 18:56:54 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 1.299 2021/07/10 18:56:54 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> 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_name> 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> argument_expression_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_name> 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 | begin_type end_type 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 begin_type end_type notype_decl { 446 $$ = $3; 447 } 448 | begin_type declmods end_type notype_decl { 449 $$ = $4; 450 } 451 | begin_type declaration_specifiers end_type type_decl { 452 $$ = $4; 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 begin_type declmods end_type T_SEMI { 474 /* empty declaration */ 475 warning(2); 476 } 477 | begin_type declmods end_type notype_init_decls T_SEMI 478 | begin_type declaration_specifiers end_type 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 | begin_type declaration_specifiers end_type 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 | begin_type declmods error 494 | begin_type 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 begin_type declmods end_type 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 | begin_type declmods end_type notype_init_decls T_SEMI 513 | begin_type declaration_specifiers end_type 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 | begin_type declaration_specifiers end_type type_init_decls T_SEMI 523 ; 524 525 begin_type: 526 /* empty */ { 527 begin_type(); 528 } 529 ; 530 531 end_type: 532 /* empty */ { 533 end_type(); 534 } 535 ; 536 537 declaration_specifiers: /* C99 6.7 */ 538 add_typespec 539 | declmods add_typespec 540 | type_attribute declaration_specifiers 541 | declaration_specifiers declmod 542 | declaration_specifiers add_notype_typespec 543 ; 544 545 declmods: 546 qualifier_or_storage_class 547 | declmods declmod 548 ; 549 550 declmod: 551 qualifier_or_storage_class 552 | type_attribute 553 ; 554 555 qualifier_or_storage_class: 556 add_type_qualifier 557 | T_SCLASS { 558 add_storage_class($1); 559 } 560 ; 561 562 add_typespec: 563 typespec { 564 add_type($1); 565 } 566 ; 567 568 typespec: 569 notype_typespec 570 | T_TYPENAME { 571 $$ = getsym($1)->s_type; 572 } 573 ; 574 575 add_notype_typespec: 576 notype_typespec { 577 add_type($1); 578 } 579 ; 580 581 notype_typespec: 582 T_TYPE { 583 $$ = gettyp($1); 584 } 585 | T_TYPEOF term { 586 $$ = $2->tn_type; 587 } 588 | struct_spec { 589 end_declaration_level(); 590 $$ = $1; 591 } 592 | enum_spec { 593 end_declaration_level(); 594 $$ = $1; 595 } 596 ; 597 598 struct_spec: 599 struct struct_tag { 600 /* 601 * STDC requires that "struct a;" always introduces 602 * a new tag if "a" is not declared at current level 603 * 604 * yychar is valid because otherwise the parser would not 605 * have been able to decide if it must shift or reduce 606 */ 607 $$ = mktag($2, $1, false, yychar == T_SEMI); 608 } 609 | struct struct_tag { 610 dcs->d_tagtyp = mktag($2, $1, true, false); 611 } struct_declaration { 612 $$ = complete_tag_struct_or_union(dcs->d_tagtyp, $4); 613 } 614 | struct { 615 dcs->d_tagtyp = mktag(NULL, $1, true, false); 616 } struct_declaration { 617 $$ = complete_tag_struct_or_union(dcs->d_tagtyp, $3); 618 } 619 | struct error { 620 symtyp = FVFT; 621 $$ = gettyp(INT); 622 } 623 ; 624 625 struct: 626 T_STRUCT_OR_UNION { 627 symtyp = FTAG; 628 begin_declaration_level($1 == STRUCT ? MOS : MOU); 629 dcs->d_offset = 0; 630 dcs->d_sou_align_in_bits = CHAR_SIZE; 631 } type_attribute_list_opt 632 ; 633 634 struct_tag: 635 identifier { 636 $$ = getsym($1); 637 } 638 ; 639 640 struct_declaration: 641 T_LBRACE { 642 symtyp = FVFT; 643 } member_declaration_list_semi T_RBRACE { 644 $$ = $3; 645 } 646 ; 647 648 member_declaration_list_semi: 649 /* empty */ { 650 $$ = NULL; 651 } 652 | member_declaration_list T_SEMI 653 | member_declaration_list { 654 if (sflag) { 655 /* syntax req. ';' after last struct/union member */ 656 error(66); 657 } else { 658 /* syntax req. ';' after last struct/union member */ 659 warning(66); 660 } 661 $$ = $1; 662 } 663 ; 664 665 member_declaration_list: 666 member_declaration 667 | member_declaration_list T_SEMI member_declaration { 668 $$ = lnklst($1, $3); 669 } 670 ; 671 672 member_declaration: 673 begin_type add_type_qualifier_list end_type { 674 /* too late, i know, but getsym() compensates it */ 675 symtyp = FMEMBER; 676 } notype_member_decls type_attribute_opt { 677 symtyp = FVFT; 678 $$ = $5; 679 } 680 | begin_type noclass_declspecs end_type { 681 symtyp = FMEMBER; 682 } type_member_decls type_attribute_opt { 683 symtyp = FVFT; 684 $$ = $5; 685 } 686 | begin_type add_type_qualifier_list end_type type_attribute_opt { 687 /* syntax error '%s' */ 688 error(249, "member without type"); 689 $$ = NULL; 690 } 691 | begin_type noclass_declspecs end_type type_attribute_opt { 692 symtyp = FVFT; 693 if (!Sflag) 694 /* anonymous struct/union members is a C9X feature */ 695 warning(49); 696 if (is_struct_or_union(dcs->d_type->t_tspec)) { 697 $$ = dcs->d_type->t_str->sou_first_member; 698 /* add all the members of the anonymous struct/union */ 699 anonymize($$); 700 } else { 701 /* syntax error '%s' */ 702 error(249, "unnamed member"); 703 $$ = NULL; 704 } 705 } 706 | error { 707 symtyp = FVFT; 708 $$ = NULL; 709 } 710 ; 711 712 noclass_declspecs: 713 noclass_declspecs_postfix 714 | type_attribute noclass_declspecs_postfix 715 ; 716 717 noclass_declspecs_postfix: 718 add_typespec 719 | add_type_qualifier_list add_typespec 720 | noclass_declspecs_postfix add_type_qualifier 721 | noclass_declspecs_postfix add_notype_typespec 722 | noclass_declspecs_postfix type_attribute 723 ; 724 725 add_type_qualifier_list: 726 add_type_qualifier 727 | add_type_qualifier_list add_type_qualifier 728 ; 729 730 add_type_qualifier: 731 T_QUAL { 732 add_qualifier($1); 733 } 734 ; 735 736 notype_member_decls: 737 notype_member_decl { 738 $$ = declarator_1_struct_union($1); 739 } 740 | notype_member_decls { 741 symtyp = FMEMBER; 742 } T_COMMA type_member_decl { 743 $$ = lnklst($1, declarator_1_struct_union($4)); 744 } 745 ; 746 747 type_member_decls: 748 type_member_decl { 749 $$ = declarator_1_struct_union($1); 750 } 751 | type_member_decls { 752 symtyp = FMEMBER; 753 } T_COMMA type_member_decl { 754 $$ = lnklst($1, declarator_1_struct_union($4)); 755 } 756 ; 757 758 notype_member_decl: 759 notype_decl 760 | notype_decl T_COLON constant_expr { /* C99 6.7.2.1 */ 761 $$ = bitfield($1, to_int_constant($3, true)); 762 } 763 | { 764 symtyp = FVFT; 765 } T_COLON constant_expr { /* C99 6.7.2.1 */ 766 $$ = bitfield(NULL, to_int_constant($3, true)); 767 } 768 ; 769 770 type_member_decl: 771 type_decl 772 | type_decl T_COLON constant_expr { 773 $$ = bitfield($1, to_int_constant($3, true)); 774 } 775 | { 776 symtyp = FVFT; 777 } T_COLON constant_expr { 778 $$ = bitfield(NULL, to_int_constant($3, true)); 779 } 780 ; 781 782 enum_spec: 783 enum enum_tag { 784 $$ = mktag($2, ENUM, false, false); 785 } 786 | enum enum_tag { 787 dcs->d_tagtyp = mktag($2, ENUM, true, false); 788 } enum_declaration { 789 $$ = complete_tag_enum(dcs->d_tagtyp, $4); 790 } 791 | enum { 792 dcs->d_tagtyp = mktag(NULL, ENUM, true, false); 793 } enum_declaration { 794 $$ = complete_tag_enum(dcs->d_tagtyp, $3); 795 } 796 | enum error { 797 symtyp = FVFT; 798 $$ = gettyp(INT); 799 } 800 ; 801 802 enum: 803 T_ENUM { 804 symtyp = FTAG; 805 begin_declaration_level(CTCONST); 806 } 807 ; 808 809 enum_tag: 810 identifier { 811 $$ = getsym($1); 812 } 813 ; 814 815 enum_declaration: 816 T_LBRACE { 817 symtyp = FVFT; 818 enumval = 0; 819 } enumerator_list enumerator_list_comma_opt T_RBRACE { 820 $$ = $3; 821 } 822 ; 823 824 enumerator_list: /* C99 6.7.2.2 */ 825 enumerator 826 | enumerator_list T_COMMA enumerator { 827 $$ = lnklst($1, $3); 828 } 829 | error { 830 $$ = NULL; 831 } 832 ; 833 834 enumerator_list_comma_opt: 835 /* empty */ 836 | T_COMMA { 837 if (sflag) { 838 /* trailing ',' prohibited in enum declaration */ 839 error(54); 840 } else { 841 /* trailing ',' prohibited in enum declaration */ 842 c99ism(54); 843 } 844 } 845 ; 846 847 enumerator: /* C99 6.7.2.2 */ 848 enumeration_constant { 849 $$ = enumeration_constant($1, enumval, true); 850 } 851 | enumeration_constant T_ASSIGN constant_expr { 852 $$ = enumeration_constant($1, to_int_constant($3, true), false); 853 } 854 ; 855 856 enumeration_constant: /* C99 6.4.4.3 */ 857 identifier { 858 $$ = getsym($1); 859 } 860 ; 861 862 863 /* 864 * For an explanation of 'notype' in the following rules, see the Bison 865 * manual, section 7.1 "Semantic Info in Token Kinds". 866 */ 867 868 notype_init_decls: 869 notype_init_decl 870 | notype_init_decls T_COMMA type_init_decl 871 ; 872 873 type_init_decls: 874 type_init_decl 875 | type_init_decls T_COMMA type_init_decl 876 ; 877 878 notype_init_decl: 879 notype_decl asm_or_symbolrename_opt { 880 cgram_declare($1, false, $2); 881 check_size($1); 882 } 883 | notype_decl asm_or_symbolrename_opt { 884 begin_initialization($1); 885 cgram_declare($1, true, $2); 886 } T_ASSIGN initializer { 887 check_size($1); 888 end_initialization(); 889 } 890 ; 891 892 type_init_decl: 893 type_decl asm_or_symbolrename_opt { 894 cgram_declare($1, false, $2); 895 check_size($1); 896 } 897 | type_decl asm_or_symbolrename_opt { 898 begin_initialization($1); 899 cgram_declare($1, true, $2); 900 } T_ASSIGN initializer { 901 check_size($1); 902 end_initialization(); 903 } 904 ; 905 906 notype_decl: 907 /* TODO: removing type_attribute_list_opt here removes another 18 conflicts */ 908 type_attribute_list_opt notype_direct_decl { 909 $$ = $2; 910 } 911 | pointer type_attribute_list_opt notype_direct_decl { 912 $$ = add_pointer($3, $1); 913 } 914 ; 915 916 type_decl: 917 /* TODO: removing type_attribute_list_opt here removes another 16 conflicts */ 918 type_attribute_list_opt type_direct_decl { 919 $$ = $2; 920 } 921 | pointer type_attribute_list_opt type_direct_decl { 922 $$ = add_pointer($3, $1); 923 } 924 ; 925 926 notype_direct_decl: 927 T_NAME { 928 $$ = declarator_name(getsym($1)); 929 } 930 | T_LPAREN type_decl T_RPAREN { 931 $$ = $2; 932 } 933 | notype_direct_decl T_LBRACK T_RBRACK { 934 $$ = add_array($1, false, 0); 935 } 936 | notype_direct_decl T_LBRACK array_size T_RBRACK { 937 $$ = add_array($1, true, to_int_constant($3, false)); 938 } 939 | notype_direct_decl param_list asm_or_symbolrename_opt { 940 $$ = add_function(symbolrename($1, $3), $2); 941 end_declaration_level(); 942 block_level--; 943 } 944 | notype_direct_decl type_attribute 945 ; 946 947 type_direct_decl: 948 identifier { 949 $$ = declarator_name(getsym($1)); 950 } 951 | T_LPAREN type_decl T_RPAREN { 952 $$ = $2; 953 } 954 | type_direct_decl T_LBRACK T_RBRACK { 955 $$ = add_array($1, false, 0); 956 } 957 | type_direct_decl T_LBRACK array_size T_RBRACK { 958 $$ = add_array($1, true, to_int_constant($3, false)); 959 } 960 | type_direct_decl param_list asm_or_symbolrename_opt { 961 $$ = add_function(symbolrename($1, $3), $2); 962 end_declaration_level(); 963 block_level--; 964 } 965 | type_direct_decl type_attribute 966 ; 967 968 /* 969 * The two distinct rules type_param_decl and notype_param_decl avoid a 970 * conflict in argument lists. A typename enclosed in parentheses is always 971 * treated as a typename, not an argument name. For example, after 972 * "typedef double a;", the declaration "f(int (a));" is interpreted as 973 * "f(int (double));", not "f(int a);". 974 */ 975 type_param_decl: 976 direct_param_decl 977 | pointer direct_param_decl { 978 $$ = add_pointer($2, $1); 979 } 980 ; 981 982 notype_param_decl: 983 direct_notype_param_decl 984 | pointer direct_notype_param_decl { 985 $$ = add_pointer($2, $1); 986 } 987 ; 988 989 direct_param_decl: 990 identifier type_attribute_list_opt { 991 $$ = declarator_name(getsym($1)); 992 } 993 | T_LPAREN notype_param_decl T_RPAREN { 994 $$ = $2; 995 } 996 | direct_param_decl T_LBRACK T_RBRACK { 997 $$ = add_array($1, false, 0); 998 } 999 | direct_param_decl T_LBRACK array_size T_RBRACK { 1000 $$ = add_array($1, true, to_int_constant($3, false)); 1001 } 1002 | direct_param_decl param_list asm_or_symbolrename_opt { 1003 $$ = add_function(symbolrename($1, $3), $2); 1004 end_declaration_level(); 1005 block_level--; 1006 } 1007 ; 1008 1009 direct_notype_param_decl: 1010 identifier /* XXX: missing type_attribute_list_opt? */ { 1011 $$ = declarator_name(getsym($1)); 1012 } 1013 | T_LPAREN notype_param_decl T_RPAREN { 1014 $$ = $2; 1015 } 1016 | direct_notype_param_decl T_LBRACK T_RBRACK { 1017 $$ = add_array($1, false, 0); 1018 } 1019 | direct_notype_param_decl T_LBRACK array_size T_RBRACK { 1020 $$ = add_array($1, true, to_int_constant($3, false)); 1021 } 1022 | direct_notype_param_decl param_list asm_or_symbolrename_opt { 1023 $$ = add_function(symbolrename($1, $3), $2); 1024 end_declaration_level(); 1025 block_level--; 1026 } 1027 ; 1028 1029 pointer: /* C99 6.7.5 */ 1030 asterisk type_qualifier_list_opt { 1031 $$ = merge_qualified_pointer($1, $2); 1032 } 1033 | asterisk type_qualifier_list_opt pointer { 1034 $$ = merge_qualified_pointer($1, $2); 1035 $$ = merge_qualified_pointer($$, $3); 1036 } 1037 ; 1038 1039 asterisk: 1040 T_ASTERISK { 1041 $$ = xcalloc(1, sizeof(*$$)); 1042 $$->p_pointer = true; 1043 } 1044 ; 1045 1046 type_qualifier_list_opt: 1047 /* empty */ { 1048 $$ = NULL; 1049 } 1050 | type_qualifier_list 1051 ; 1052 1053 type_qualifier_list: /* C99 6.7.5 */ 1054 type_qualifier 1055 | type_qualifier_list type_qualifier { 1056 $$ = merge_qualified_pointer($1, $2); 1057 } 1058 ; 1059 1060 type_qualifier: 1061 T_QUAL { 1062 $$ = xcalloc(1, sizeof(*$$)); 1063 if ($1 == CONST) { 1064 $$->p_const = true; 1065 } else if ($1 == VOLATILE) { 1066 $$->p_volatile = true; 1067 } else { 1068 lint_assert($1 == RESTRICT || $1 == THREAD); 1069 } 1070 } 1071 ; 1072 1073 align_as: /* See alignment-specifier in C11 6.7.5 */ 1074 typespec 1075 | constant_expr 1076 ; 1077 1078 param_list: 1079 id_list_lparen identifier_list T_RPAREN { 1080 $$ = $2; 1081 } 1082 | abstract_decl_param_list 1083 ; 1084 1085 id_list_lparen: 1086 T_LPAREN { 1087 block_level++; 1088 begin_declaration_level(PROTO_ARG); 1089 } 1090 ; 1091 1092 identifier_list: 1093 T_NAME { 1094 $$ = old_style_function_name(getsym($1)); 1095 } 1096 | identifier_list T_COMMA T_NAME { 1097 $$ = lnklst($1, old_style_function_name(getsym($3))); 1098 } 1099 | identifier_list error 1100 ; 1101 1102 abstract_decl_param_list: 1103 abstract_decl_lparen T_RPAREN type_attribute_opt { 1104 $$ = NULL; 1105 } 1106 | abstract_decl_lparen vararg_parameter_type_list T_RPAREN type_attribute_opt { 1107 dcs->d_proto = true; 1108 $$ = $2; 1109 } 1110 | abstract_decl_lparen error T_RPAREN type_attribute_opt { 1111 $$ = NULL; 1112 } 1113 ; 1114 1115 abstract_decl_lparen: 1116 T_LPAREN { 1117 block_level++; 1118 begin_declaration_level(PROTO_ARG); 1119 } 1120 ; 1121 1122 vararg_parameter_type_list: 1123 parameter_type_list 1124 | parameter_type_list T_COMMA T_ELLIPSIS { 1125 dcs->d_vararg = true; 1126 $$ = $1; 1127 } 1128 | T_ELLIPSIS { 1129 if (sflag) { 1130 /* ANSI C requires formal parameter before '...' */ 1131 error(84); 1132 } else if (!tflag) { 1133 /* ANSI C requires formal parameter before '...' */ 1134 warning(84); 1135 } 1136 dcs->d_vararg = true; 1137 $$ = NULL; 1138 } 1139 ; 1140 1141 parameter_type_list: 1142 parameter_declaration 1143 | parameter_type_list T_COMMA parameter_declaration { 1144 $$ = lnklst($1, $3); 1145 } 1146 ; 1147 1148 /* XXX: C99 6.7.5 defines the same name, but it looks completely different. */ 1149 parameter_declaration: 1150 begin_type declmods end_type { 1151 $$ = declare_argument(abstract_name(), false); 1152 } 1153 | begin_type declaration_specifiers end_type { 1154 $$ = declare_argument(abstract_name(), false); 1155 } 1156 | begin_type declmods end_type notype_param_decl { 1157 $$ = declare_argument($4, false); 1158 } 1159 | begin_type declaration_specifiers end_type type_param_decl { 1160 $$ = declare_argument($4, false); 1161 } 1162 | begin_type declmods end_type abstract_declarator { 1163 $$ = declare_argument($4, false); 1164 } 1165 | begin_type declaration_specifiers end_type abstract_declarator { 1166 $$ = declare_argument($4, false); 1167 } 1168 ; 1169 1170 asm_or_symbolrename_opt: /* expect only one */ 1171 /* empty */ { 1172 $$ = NULL; 1173 } 1174 | T_ASM T_LPAREN T_STRING T_RPAREN { 1175 freeyyv(&$3, T_STRING); 1176 $$ = NULL; 1177 } 1178 | T_SYMBOLRENAME T_LPAREN T_NAME T_RPAREN { 1179 $$ = $3; 1180 } 1181 ; 1182 1183 initializer: /* C99 6.7.8 "Initialization" */ 1184 expr %prec T_COMMA { 1185 init_expr($1); 1186 } 1187 | init_lbrace init_rbrace { 1188 /* XXX: Empty braces are not covered by C99 6.7.8. */ 1189 } 1190 | init_lbrace initializer_list comma_opt init_rbrace 1191 | error 1192 ; 1193 1194 initializer_list: /* C99 6.7.8 "Initialization" */ 1195 initializer_list_item 1196 | initializer_list T_COMMA initializer_list_item 1197 ; 1198 1199 initializer_list_item: 1200 designation initializer 1201 | initializer 1202 ; 1203 1204 designation: /* C99 6.7.8 "Initialization" */ 1205 designator_list T_ASSIGN 1206 | identifier T_COLON { 1207 /* GCC style struct or union member name in initializer */ 1208 gnuism(315); 1209 add_designator_member($1); 1210 } 1211 ; 1212 1213 designator_list: /* C99 6.7.8 "Initialization" */ 1214 designator 1215 | designator_list designator 1216 ; 1217 1218 designator: /* C99 6.7.8 "Initialization" */ 1219 T_LBRACK range T_RBRACK { 1220 add_designator_subscript($2); 1221 if (!Sflag) 1222 /* array initializer with des.s is a C9X feature */ 1223 warning(321); 1224 } 1225 | T_POINT identifier { 1226 if (!Sflag) 1227 /* struct or union member name in initializer is ... */ 1228 warning(313); 1229 add_designator_member($2); 1230 } 1231 ; 1232 1233 range: 1234 constant_expr { 1235 $$.lo = to_int_constant($1, true); 1236 $$.hi = $$.lo; 1237 } 1238 | constant_expr T_ELLIPSIS constant_expr { 1239 $$.lo = to_int_constant($1, true); 1240 $$.hi = to_int_constant($3, true); 1241 /* initialization with '[a...b]' is a GCC extension */ 1242 gnuism(340); 1243 } 1244 ; 1245 1246 init_lbrace: 1247 T_LBRACE { 1248 init_lbrace(); 1249 } 1250 ; 1251 1252 init_rbrace: 1253 T_RBRACE { 1254 init_rbrace(); 1255 } 1256 ; 1257 1258 type_name: /* C99 6.7.6 */ 1259 { 1260 begin_declaration_level(ABSTRACT); 1261 } abstract_declaration { 1262 end_declaration_level(); 1263 $$ = $2->s_type; 1264 } 1265 ; 1266 1267 abstract_declaration: 1268 begin_type add_type_qualifier_list end_type { 1269 $$ = declare_1_abstract(abstract_name()); 1270 } 1271 | begin_type noclass_declspecs end_type { 1272 $$ = declare_1_abstract(abstract_name()); 1273 } 1274 | begin_type add_type_qualifier_list end_type abstract_declarator { 1275 $$ = declare_1_abstract($4); 1276 } 1277 | begin_type noclass_declspecs end_type abstract_declarator { 1278 $$ = declare_1_abstract($4); 1279 } 1280 ; 1281 1282 abstract_declarator: /* C99 6.7.6 */ 1283 pointer { 1284 $$ = add_pointer(abstract_name(), $1); 1285 } 1286 | direct_abstract_declarator 1287 | pointer direct_abstract_declarator { 1288 $$ = add_pointer($2, $1); 1289 } 1290 | T_TYPEOF term { /* GCC extension */ 1291 $$ = mktempsym($2->tn_type); 1292 } 1293 ; 1294 1295 direct_abstract_declarator: /* C99 6.7.6 */ 1296 direct_abstract_declarator_postfix 1297 | type_attribute direct_abstract_declarator_postfix { 1298 $$ = $2; 1299 } 1300 ; 1301 1302 direct_abstract_declarator_postfix: /* C99 6.7.6 */ 1303 T_LPAREN abstract_declarator T_RPAREN { 1304 $$ = $2; 1305 } 1306 | T_LBRACK T_RBRACK { 1307 $$ = add_array(abstract_name(), false, 0); 1308 } 1309 | T_LBRACK array_size T_RBRACK { 1310 $$ = add_array(abstract_name(), true, to_int_constant($2, false)); 1311 } 1312 | direct_abstract_declarator_postfix T_LBRACK T_RBRACK { 1313 $$ = add_array($1, false, 0); 1314 } 1315 | direct_abstract_declarator_postfix 1316 T_LBRACK T_ASTERISK T_RBRACK { /* C99 */ 1317 $$ = add_array($1, false, 0); 1318 } 1319 | direct_abstract_declarator_postfix T_LBRACK array_size T_RBRACK { 1320 $$ = add_array($1, true, to_int_constant($3, false)); 1321 } 1322 | abstract_decl_param_list asm_or_symbolrename_opt { 1323 $$ = add_function(symbolrename(abstract_name(), $2), $1); 1324 end_declaration_level(); 1325 block_level--; 1326 } 1327 | direct_abstract_declarator_postfix abstract_decl_param_list 1328 asm_or_symbolrename_opt { 1329 $$ = add_function(symbolrename($1, $3), $2); 1330 end_declaration_level(); 1331 block_level--; 1332 } 1333 | direct_abstract_declarator_postfix type_attribute 1334 ; 1335 1336 array_size: 1337 type_qualifier_list_opt T_SCLASS constant_expr { 1338 /* C11 6.7.6.3p7 */ 1339 if ($2 != STATIC) 1340 yyerror("Bad attribute"); 1341 /* static array size is a C11 extension */ 1342 c11ism(343); 1343 $$ = $3; 1344 } 1345 | constant_expr 1346 ; 1347 1348 non_expr_statement: 1349 gcc_attribute T_SEMI 1350 | labeled_statement 1351 | compound_statement 1352 | selection_statement 1353 | iteration_statement 1354 | jump_statement { 1355 seen_fallthrough = false; 1356 } 1357 | asm_statement 1358 ; 1359 1360 statement: /* C99 6.8 */ 1361 expression_statement 1362 | non_expr_statement 1363 ; 1364 1365 labeled_statement: /* C99 6.8.1 */ 1366 label gcc_attribute_list_opt statement 1367 ; 1368 1369 label: 1370 T_NAME T_COLON { 1371 symtyp = FLABEL; 1372 named_label(getsym($1)); 1373 } 1374 | T_CASE constant_expr T_COLON { 1375 case_label($2); 1376 seen_fallthrough = true; 1377 } 1378 | T_CASE constant_expr T_ELLIPSIS constant_expr T_COLON { 1379 /* XXX: We don't fill all cases */ 1380 case_label($2); 1381 seen_fallthrough = true; 1382 } 1383 | T_DEFAULT T_COLON { 1384 default_label(); 1385 seen_fallthrough = true; 1386 } 1387 ; 1388 1389 compound_statement: /* C99 6.8.2 */ 1390 compound_statement_lbrace block_item_list_opt 1391 compound_statement_rbrace 1392 ; 1393 1394 compound_statement_lbrace: 1395 T_LBRACE { 1396 block_level++; 1397 mem_block_level++; 1398 begin_declaration_level(AUTO); 1399 } 1400 ; 1401 1402 compound_statement_rbrace: 1403 T_RBRACE { 1404 end_declaration_level(); 1405 freeblk(); 1406 mem_block_level--; 1407 block_level--; 1408 seen_fallthrough = false; 1409 } 1410 ; 1411 1412 block_item_list_opt: /* C99 6.8.2 */ 1413 /* empty */ 1414 | block_item_list 1415 ; 1416 1417 block_item_list: 1418 block_item 1419 | block_item_list block_item { 1420 if (!Sflag && $1 && !$2) 1421 /* declarations after statements is a C99 feature */ 1422 c99ism(327); 1423 $$ = $1 || $2; 1424 } 1425 ; 1426 1427 block_item: 1428 statement { 1429 $$ = true; 1430 restore_warning_flags(); 1431 } 1432 | declaration { 1433 $$ = false; 1434 restore_warning_flags(); 1435 } 1436 ; 1437 1438 expression_statement: /* C99 6.8.3 */ 1439 expr T_SEMI { 1440 expr($1, false, false, false, false); 1441 seen_fallthrough = false; 1442 } 1443 | T_SEMI { 1444 seen_fallthrough = false; 1445 } 1446 ; 1447 1448 selection_statement: /* C99 6.8.4 */ 1449 if_without_else { 1450 save_warning_flags(); 1451 if2(); 1452 if3(false); 1453 } 1454 | if_without_else T_ELSE { 1455 save_warning_flags(); 1456 if2(); 1457 } statement { 1458 clear_warning_flags(); 1459 if3(true); 1460 } 1461 | if_without_else T_ELSE error { 1462 clear_warning_flags(); 1463 if3(false); 1464 } 1465 | switch_expr statement { 1466 clear_warning_flags(); 1467 switch2(); 1468 } 1469 | switch_expr error { 1470 clear_warning_flags(); 1471 switch2(); 1472 } 1473 ; 1474 1475 if_without_else: /* see C99 6.8.4 */ 1476 if_expr statement 1477 | if_expr error 1478 ; 1479 1480 if_expr: /* see C99 6.8.4 */ 1481 T_IF T_LPAREN expr T_RPAREN { 1482 if1($3); 1483 clear_warning_flags(); 1484 } 1485 ; 1486 1487 switch_expr: /* see C99 6.8.4 */ 1488 T_SWITCH T_LPAREN expr T_RPAREN { 1489 switch1($3); 1490 clear_warning_flags(); 1491 } 1492 ; 1493 1494 iteration_statement: /* C99 6.8.5 */ 1495 T_WHILE T_LPAREN expr T_RPAREN { 1496 while1($3); 1497 clear_warning_flags(); 1498 } iteration_body { 1499 clear_warning_flags(); 1500 while2(); 1501 } 1502 | do statement { 1503 clear_warning_flags(); 1504 } T_WHILE T_LPAREN expr T_RPAREN T_SEMI { 1505 do2($6); 1506 seen_fallthrough = false; 1507 } 1508 | do error { 1509 clear_warning_flags(); 1510 do2(NULL); 1511 } 1512 | for_exprs iteration_body { 1513 clear_warning_flags(); 1514 for2(); 1515 end_declaration_level(); 1516 block_level--; 1517 } 1518 ; 1519 1520 iteration_body: 1521 statement 1522 | error 1523 ; 1524 1525 do: /* see C99 6.8.5 */ 1526 T_DO { 1527 do1(); 1528 } 1529 ; 1530 1531 for_start: /* see C99 6.8.5 */ 1532 T_FOR T_LPAREN { 1533 begin_declaration_level(AUTO); 1534 block_level++; 1535 } 1536 ; 1537 1538 for_exprs: /* see C99 6.8.5 */ 1539 for_start 1540 begin_type declaration_specifiers end_type notype_init_decls T_SEMI 1541 expr_opt T_SEMI 1542 expr_opt T_RPAREN { 1543 /* variable declaration in for loop */ 1544 c99ism(325); 1545 for1(NULL, $7, $9); 1546 clear_warning_flags(); 1547 } 1548 | for_start expr_opt T_SEMI expr_opt T_SEMI expr_opt T_RPAREN { 1549 for1($2, $4, $6); 1550 clear_warning_flags(); 1551 } 1552 ; 1553 1554 jump_statement: /* C99 6.8.6 */ 1555 goto identifier T_SEMI { 1556 do_goto(getsym($2)); 1557 } 1558 | goto error T_SEMI { 1559 symtyp = FVFT; 1560 } 1561 | T_CONTINUE T_SEMI { 1562 do_continue(); 1563 } 1564 | T_BREAK T_SEMI { 1565 do_break(); 1566 } 1567 | T_RETURN T_SEMI { 1568 do_return(NULL); 1569 } 1570 | T_RETURN expr T_SEMI { 1571 do_return($2); 1572 } 1573 ; 1574 1575 goto: 1576 T_GOTO { 1577 symtyp = FLABEL; 1578 } 1579 ; 1580 1581 asm_statement: 1582 T_ASM T_LPAREN read_until_rparen T_SEMI { 1583 setasm(); 1584 } 1585 | T_ASM T_QUAL T_LPAREN read_until_rparen T_SEMI { 1586 setasm(); 1587 } 1588 | T_ASM error 1589 ; 1590 1591 read_until_rparen: 1592 /* empty */ { 1593 ignore_up_to_rparen(); 1594 } 1595 ; 1596 1597 constant_expr_list_opt: 1598 /* empty */ 1599 | constant_expr_list 1600 ; 1601 1602 constant_expr_list: 1603 constant_expr 1604 | constant_expr_list T_COMMA constant_expr 1605 ; 1606 1607 constant_expr: /* C99 6.6 */ 1608 expr %prec T_ASSIGN 1609 ; 1610 1611 expr_opt: 1612 /* empty */ { 1613 $$ = NULL; 1614 } 1615 | expr 1616 ; 1617 1618 expr: /* C99 6.5 */ 1619 expr T_ASTERISK expr { 1620 $$ = build(MULT, $1, $3); 1621 } 1622 | expr T_MULTIPLICATIVE expr { 1623 $$ = build($2, $1, $3); 1624 } 1625 | expr T_ADDITIVE expr { 1626 $$ = build($2, $1, $3); 1627 } 1628 | expr T_SHIFT expr { 1629 $$ = build($2, $1, $3); 1630 } 1631 | expr T_RELATIONAL expr { 1632 $$ = build($2, $1, $3); 1633 } 1634 | expr T_EQUALITY expr { 1635 $$ = build($2, $1, $3); 1636 } 1637 | expr T_AMPER expr { 1638 $$ = build(BITAND, $1, $3); 1639 } 1640 | expr T_BITXOR expr { 1641 $$ = build(BITXOR, $1, $3); 1642 } 1643 | expr T_BITOR expr { 1644 $$ = build(BITOR, $1, $3); 1645 } 1646 | expr T_LOGAND expr { 1647 $$ = build(LOGAND, $1, $3); 1648 } 1649 | expr T_LOGOR expr { 1650 $$ = build(LOGOR, $1, $3); 1651 } 1652 | expr T_QUEST expr T_COLON expr { 1653 $$ = build(QUEST, $1, build(COLON, $3, $5)); 1654 } 1655 | expr T_ASSIGN expr { 1656 $$ = build(ASSIGN, $1, $3); 1657 } 1658 | expr T_OPASSIGN expr { 1659 $$ = build($2, $1, $3); 1660 } 1661 | expr T_COMMA expr { 1662 $$ = build(COMMA, $1, $3); 1663 } 1664 | term 1665 | generic_selection 1666 ; 1667 1668 assignment_expression: /* C99 6.5.16 */ 1669 expr %prec T_ASSIGN 1670 ; 1671 1672 term: /* see C99 6.5.1 */ 1673 T_NAME { 1674 /* XXX really necessary? */ 1675 if (yychar < 0) 1676 yychar = yylex(); 1677 $$ = new_name_node(getsym($1), yychar); 1678 } 1679 | string { 1680 $$ = new_string_node($1); 1681 } 1682 | T_CON { 1683 $$ = expr_new_constant(gettyp($1->v_tspec), $1); 1684 } 1685 | T_LPAREN expr T_RPAREN { 1686 if ($2 != NULL) 1687 $2->tn_parenthesized = true; 1688 $$ = $2; 1689 } 1690 | T_LPAREN compound_statement_lbrace gcc_statement_expr_list { 1691 block_level--; 1692 mem_block_level--; 1693 begin_initialization(mktempsym(dup_type($3->tn_type))); 1694 mem_block_level++; 1695 block_level++; 1696 /* ({ }) is a GCC extension */ 1697 gnuism(320); 1698 } compound_statement_rbrace T_RPAREN { 1699 $$ = new_name_node(*current_initsym(), 0); 1700 end_initialization(); 1701 } 1702 | term T_INCDEC { 1703 $$ = build($2 == INC ? INCAFT : DECAFT, $1, NULL); 1704 } 1705 | T_INCDEC term { 1706 $$ = build($1 == INC ? INCBEF : DECBEF, $2, NULL); 1707 } 1708 | T_ASTERISK term { 1709 $$ = build(INDIR, $2, NULL); 1710 } 1711 | T_AMPER term { 1712 $$ = build(ADDR, $2, NULL); 1713 } 1714 | T_UNARY term { 1715 $$ = build($1, $2, NULL); 1716 } 1717 | T_ADDITIVE term { 1718 if (tflag && $1 == PLUS) { 1719 /* unary + is illegal in traditional C */ 1720 warning(100); 1721 } 1722 $$ = build($1 == PLUS ? UPLUS : UMINUS, $2, NULL); 1723 } 1724 | term T_LBRACK expr T_RBRACK { 1725 $$ = build(INDIR, build(PLUS, $1, $3), NULL); 1726 } 1727 | term T_LPAREN T_RPAREN { 1728 $$ = new_function_call_node($1, NULL); 1729 } 1730 | term T_LPAREN argument_expression_list T_RPAREN { 1731 $$ = new_function_call_node($1, $3); 1732 } 1733 | term point_or_arrow T_NAME { 1734 if ($1 != NULL) { 1735 sym_t *msym; 1736 /* 1737 * XXX struct_or_union_member should be integrated 1738 * in build() 1739 */ 1740 if ($2 == ARROW) { 1741 /* 1742 * must do this before struct_or_union_member 1743 * is called 1744 */ 1745 $1 = cconv($1); 1746 } 1747 msym = struct_or_union_member($1, $2, getsym($3)); 1748 $$ = build($2, $1, new_name_node(msym, 0)); 1749 } else { 1750 $$ = NULL; 1751 } 1752 } 1753 | T_REAL term { 1754 $$ = build(REAL, $2, NULL); 1755 } 1756 | T_IMAG term { 1757 $$ = build(IMAG, $2, NULL); 1758 } 1759 | T_EXTENSION term { 1760 $$ = $2; 1761 } 1762 | T_BUILTIN_OFFSETOF T_LPAREN type_name T_COMMA identifier T_RPAREN { 1763 symtyp = FMEMBER; 1764 $$ = build_offsetof($3, getsym($5)); 1765 } 1766 | T_SIZEOF term { 1767 $$ = $2 == NULL ? NULL : build_sizeof($2->tn_type); 1768 if ($$ != NULL) 1769 check_expr_misc($2, false, false, false, false, false, true); 1770 } 1771 | T_SIZEOF T_LPAREN type_name T_RPAREN %prec T_SIZEOF { 1772 $$ = build_sizeof($3); 1773 } 1774 | T_ALIGNOF T_LPAREN type_name T_RPAREN { 1775 $$ = build_alignof($3); 1776 } 1777 | T_LPAREN type_name T_RPAREN term %prec T_UNARY { 1778 $$ = cast($4, $2); 1779 } 1780 | T_LPAREN type_name T_RPAREN { /* C99 6.5.2.5 "Compound literals" */ 1781 sym_t *tmp = mktempsym($2); 1782 begin_initialization(tmp); 1783 cgram_declare(tmp, true, NULL); 1784 } init_lbrace initializer_list comma_opt init_rbrace { 1785 if (!Sflag) 1786 /* compound literals are a C9X/GCC extension */ 1787 gnuism(319); 1788 $$ = new_name_node(*current_initsym(), 0); 1789 end_initialization(); 1790 } 1791 ; 1792 1793 generic_selection: /* C11 6.5.1.1 */ 1794 T_GENERIC T_LPAREN assignment_expression T_COMMA 1795 generic_assoc_list T_RPAREN { 1796 /* generic selection requires C11 or later */ 1797 c11ism(345); 1798 $$ = build_generic_selection($3, $5); 1799 } 1800 ; 1801 1802 generic_assoc_list: /* C11 6.5.1.1 */ 1803 generic_association 1804 | generic_assoc_list T_COMMA generic_association { 1805 $3->ga_prev = $1; 1806 $$ = $3; 1807 } 1808 ; 1809 1810 generic_association: /* C11 6.5.1.1 */ 1811 type_name T_COLON assignment_expression { 1812 $$ = getblk(sizeof(*$$)); 1813 $$->ga_arg = $1; 1814 $$->ga_result = $3; 1815 } 1816 | T_DEFAULT T_COLON assignment_expression { 1817 $$ = getblk(sizeof(*$$)); 1818 $$->ga_arg = NULL; 1819 $$->ga_result = $3; 1820 } 1821 ; 1822 1823 argument_expression_list: /* C99 6.5.2 */ 1824 expr %prec T_COMMA { 1825 $$ = new_function_argument_node(NULL, $1); 1826 } 1827 | argument_expression_list T_COMMA expr { 1828 $$ = new_function_argument_node($1, $3); 1829 } 1830 ; 1831 1832 /* 1833 * The inner part of a GCC statement-expression of the form ({ ... }). 1834 * 1835 * https://gcc.gnu.org/onlinedocs/gcc/Statement-Exprs.html 1836 */ 1837 gcc_statement_expr_list: 1838 gcc_statement_expr_item 1839 | gcc_statement_expr_list gcc_statement_expr_item { 1840 $$ = $2; 1841 } 1842 ; 1843 1844 gcc_statement_expr_item: 1845 declaration { 1846 clear_warning_flags(); 1847 $$ = NULL; 1848 } 1849 | non_expr_statement { 1850 $$ = expr_zalloc_tnode(); 1851 $$->tn_type = gettyp(VOID); 1852 } 1853 | expr T_SEMI { 1854 if ($1 == NULL) { /* in case of syntax errors */ 1855 $$ = expr_zalloc_tnode(); 1856 $$->tn_type = gettyp(VOID); 1857 } else { 1858 /* XXX: do that only on the last name */ 1859 if ($1->tn_op == NAME) 1860 $1->tn_sym->s_used = true; 1861 $$ = $1; 1862 expr($1, false, false, false, false); 1863 seen_fallthrough = false; 1864 } 1865 } 1866 ; 1867 1868 string: 1869 T_STRING 1870 | T_STRING string2 { 1871 $$ = cat_strings($1, $2); 1872 } 1873 ; 1874 1875 string2: 1876 T_STRING { 1877 if (tflag) { 1878 /* concatenated strings are illegal in traditional C */ 1879 warning(219); 1880 } 1881 $$ = $1; 1882 } 1883 | string2 T_STRING { 1884 $$ = cat_strings($1, $2); 1885 } 1886 ; 1887 1888 point_or_arrow: 1889 T_POINT { 1890 symtyp = FMEMBER; 1891 $$ = POINT; 1892 } 1893 | T_ARROW { 1894 symtyp = FMEMBER; 1895 $$ = ARROW; 1896 } 1897 ; 1898 1899 identifier: /* C99 6.4.2.1 */ 1900 T_NAME { 1901 $$ = $1; 1902 cgram_debug("name '%s'", $$->sb_name); 1903 } 1904 | T_TYPENAME { 1905 $$ = $1; 1906 cgram_debug("typename '%s'", $$->sb_name); 1907 } 1908 ; 1909 1910 comma_opt: 1911 /* empty */ 1912 | T_COMMA 1913 ; 1914 1915 /* GCC extensions */ 1916 1917 type_attribute_list_opt: 1918 /* empty */ 1919 | type_attribute_list 1920 ; 1921 1922 type_attribute_list: 1923 type_attribute 1924 | type_attribute_list type_attribute 1925 ; 1926 1927 type_attribute_opt: 1928 /* empty */ 1929 | type_attribute 1930 ; 1931 1932 type_attribute: 1933 gcc_attribute 1934 | T_ALIGNAS T_LPAREN align_as T_RPAREN 1935 | T_PACKED { 1936 addpacked(); 1937 } 1938 | T_NORETURN 1939 ; 1940 1941 gcc_attribute_list_opt: 1942 /* empty */ 1943 | gcc_attribute_list 1944 ; 1945 1946 gcc_attribute_list: 1947 gcc_attribute 1948 | gcc_attribute_list gcc_attribute 1949 ; 1950 1951 /* https://gcc.gnu.org/onlinedocs/gcc/Attribute-Syntax.html */ 1952 gcc_attribute: 1953 T_ATTRIBUTE T_LPAREN T_LPAREN { 1954 attron = true; 1955 } gcc_attribute_spec_list { 1956 attron = false; 1957 } T_RPAREN T_RPAREN 1958 ; 1959 1960 gcc_attribute_spec_list: 1961 gcc_attribute_spec 1962 | gcc_attribute_spec_list T_COMMA gcc_attribute_spec 1963 ; 1964 1965 gcc_attribute_spec: 1966 /* empty */ 1967 | T_AT_ALWAYS_INLINE 1968 | T_AT_ALIAS T_LPAREN string T_RPAREN 1969 | T_AT_ALIGNED T_LPAREN constant_expr T_RPAREN 1970 | T_AT_ALIGNED 1971 | T_AT_ALLOC_SIZE T_LPAREN constant_expr T_COMMA constant_expr T_RPAREN 1972 | T_AT_ALLOC_SIZE T_LPAREN constant_expr T_RPAREN 1973 | T_AT_BOUNDED T_LPAREN gcc_attribute_bounded 1974 T_COMMA constant_expr T_COMMA constant_expr T_RPAREN 1975 | T_AT_COLD 1976 | T_AT_COMMON 1977 | T_AT_CONSTRUCTOR T_LPAREN constant_expr T_RPAREN 1978 | T_AT_CONSTRUCTOR 1979 | T_AT_DEPRECATED T_LPAREN string T_RPAREN 1980 | T_AT_DEPRECATED 1981 | T_AT_DESTRUCTOR T_LPAREN constant_expr T_RPAREN 1982 | T_AT_DESTRUCTOR 1983 | T_AT_FALLTHROUGH { 1984 fallthru(1); 1985 } 1986 | T_AT_FORMAT T_LPAREN gcc_attribute_format T_COMMA 1987 constant_expr T_COMMA constant_expr T_RPAREN 1988 | T_AT_FORMAT_ARG T_LPAREN constant_expr T_RPAREN 1989 | T_AT_GNU_INLINE 1990 | T_AT_MALLOC 1991 | T_AT_MAY_ALIAS 1992 | T_AT_MODE T_LPAREN T_NAME T_RPAREN 1993 | T_AT_NOINLINE 1994 | T_AT_NONNULL T_LPAREN constant_expr_list_opt T_RPAREN 1995 | T_AT_NONNULL 1996 | T_AT_NONSTRING 1997 | T_AT_NORETURN 1998 | T_AT_NOTHROW 1999 | T_AT_NO_INSTRUMENT_FUNCTION 2000 | T_AT_OPTIMIZE T_LPAREN string T_RPAREN 2001 | T_AT_PACKED { 2002 addpacked(); 2003 } 2004 | T_AT_PCS T_LPAREN string T_RPAREN 2005 | T_AT_PURE 2006 | T_AT_RETURNS_TWICE 2007 | T_AT_SECTION T_LPAREN string T_RPAREN 2008 | T_AT_SENTINEL T_LPAREN constant_expr T_RPAREN 2009 | T_AT_SENTINEL 2010 | T_AT_TLS_MODEL T_LPAREN string T_RPAREN 2011 | T_AT_TUNION 2012 | T_AT_UNUSED { 2013 add_attr_used(); 2014 } 2015 | T_AT_USED { 2016 add_attr_used(); 2017 } 2018 | T_AT_VISIBILITY T_LPAREN constant_expr T_RPAREN 2019 | T_AT_WARN_UNUSED_RESULT 2020 | T_AT_WEAK 2021 | T_QUAL { 2022 if ($1 != CONST) 2023 yyerror("Bad attribute"); 2024 } 2025 ; 2026 2027 gcc_attribute_bounded: 2028 T_AT_MINBYTES 2029 | T_AT_STRING 2030 | T_AT_BUFFER 2031 ; 2032 2033 gcc_attribute_format: 2034 T_AT_FORMAT_GNU_PRINTF 2035 | T_AT_FORMAT_PRINTF 2036 | T_AT_FORMAT_SCANF 2037 | T_AT_FORMAT_STRFMON 2038 | T_AT_FORMAT_STRFTIME 2039 | T_AT_FORMAT_SYSLOG 2040 ; 2041 2042 %% 2043 2044 /* ARGSUSED */ 2045 int 2046 yyerror(const char *msg) 2047 { 2048 /* syntax error '%s' */ 2049 error(249, yytext); 2050 if (++sytxerr >= 5) 2051 norecover(); 2052 return 0; 2053 } 2054 2055 static void 2056 cgram_declare(sym_t *decl, bool initflg, sbuf_t *renaming) 2057 { 2058 declare(decl, initflg, renaming); 2059 if (renaming != NULL) 2060 freeyyv(&renaming, T_NAME); 2061 } 2062 2063 /* 2064 * Discard all input tokens up to and including the next 2065 * unmatched right paren 2066 */ 2067 static void 2068 ignore_up_to_rparen(void) 2069 { 2070 int level; 2071 2072 if (yychar < 0) 2073 yychar = yylex(); 2074 freeyyv(&yylval, yychar); 2075 2076 level = 1; 2077 while (yychar != T_RPAREN || --level > 0) { 2078 if (yychar == T_LPAREN) { 2079 level++; 2080 } else if (yychar <= 0) { 2081 break; 2082 } 2083 freeyyv(&yylval, yychar = yylex()); 2084 } 2085 2086 yyclearin; 2087 } 2088 2089 static sym_t * 2090 symbolrename(sym_t *s, sbuf_t *sb) 2091 { 2092 if (sb != NULL) 2093 s->s_rename = sb->sb_name; 2094 return s; 2095 } 2096
Indexes created Fri Oct 03 02:09:57 GMT 2025