cgram.y revision 1.296
1 %{ 2 /* $NetBSD: cgram.y,v 1.296 2021/07/10 17:35:54 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 1.296 2021/07/10 17:35:54 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 %expect 136 127 128 %union { 129 val_t *y_val; 130 sbuf_t *y_sb; 131 sym_t *y_sym; 132 op_t y_op; 133 scl_t y_scl; 134 tspec_t y_tspec; 135 tqual_t y_tqual; 136 type_t *y_type; 137 tnode_t *y_tnode; 138 range_t y_range; 139 strg_t *y_string; 140 qual_ptr *y_qual_ptr; 141 bool y_seen_statement; 142 struct generic_association *y_generic; 143 }; 144 145 %token T_LBRACE T_RBRACE T_LBRACK T_RBRACK T_LPAREN T_RPAREN 146 %token T_POINT T_ARROW 147 %token <y_op> T_UNARY 148 %token <y_op> T_INCDEC 149 %token T_SIZEOF 150 %token T_BUILTIN_OFFSETOF 151 %token T_TYPEOF 152 %token T_EXTENSION 153 %token T_ALIGNAS 154 %token T_ALIGNOF 155 %token T_ASTERISK 156 %token <y_op> T_MULTIPLICATIVE 157 %token <y_op> T_ADDITIVE 158 %token <y_op> T_SHIFT 159 %token <y_op> T_RELATIONAL 160 %token <y_op> T_EQUALITY 161 %token T_AMPER 162 %token T_BITXOR 163 %token T_BITOR 164 %token T_LOGAND 165 %token T_LOGOR 166 %token T_QUEST 167 %token T_COLON 168 %token T_ASSIGN 169 %token <y_op> T_OPASSIGN 170 %token T_COMMA 171 %token T_SEMI 172 %token T_ELLIPSIS 173 %token T_REAL 174 %token T_IMAG 175 %token T_GENERIC 176 %token T_NORETURN 177 178 /* storage classes (extern, static, auto, register and typedef) */ 179 %token <y_scl> T_SCLASS 180 181 /* 182 * predefined type keywords (char, int, short, long, unsigned, signed, 183 * float, double, void); see T_TYPENAME 184 */ 185 %token <y_tspec> T_TYPE 186 187 /* qualifiers (const, volatile, restrict, _Thread_local) */ 188 %token <y_tqual> T_QUAL 189 190 /* struct or union */ 191 %token <y_tspec> T_STRUCT_OR_UNION 192 193 /* remaining keywords */ 194 %token T_ASM 195 %token T_BREAK 196 %token T_CASE 197 %token T_CONTINUE 198 %token T_DEFAULT 199 %token T_DO 200 %token T_ELSE 201 %token T_ENUM 202 %token T_FOR 203 %token T_GOTO 204 %token T_IF 205 %token T_PACKED 206 %token T_RETURN 207 %token T_SWITCH 208 %token T_SYMBOLRENAME 209 %token T_WHILE 210 211 %token T_ATTRIBUTE 212 %token T_AT_ALIAS 213 %token T_AT_ALIGNED 214 %token T_AT_ALLOC_SIZE 215 %token T_AT_ALWAYS_INLINE 216 %token T_AT_BOUNDED 217 %token T_AT_BUFFER 218 %token T_AT_COLD 219 %token T_AT_COMMON 220 %token T_AT_CONSTRUCTOR 221 %token T_AT_DEPRECATED 222 %token T_AT_DESTRUCTOR 223 %token T_AT_FALLTHROUGH 224 %token T_AT_FORMAT 225 %token T_AT_FORMAT_ARG 226 %token T_AT_FORMAT_GNU_PRINTF 227 %token T_AT_FORMAT_PRINTF 228 %token T_AT_FORMAT_SCANF 229 %token T_AT_FORMAT_STRFMON 230 %token T_AT_FORMAT_STRFTIME 231 %token T_AT_FORMAT_SYSLOG 232 %token T_AT_GNU_INLINE 233 %token T_AT_MALLOC 234 %token T_AT_MAY_ALIAS 235 %token T_AT_MINBYTES 236 %token T_AT_MODE 237 %token T_AT_NOINLINE 238 %token T_AT_NONNULL 239 %token T_AT_NONSTRING 240 %token T_AT_NORETURN 241 %token T_AT_NOTHROW 242 %token T_AT_NO_INSTRUMENT_FUNCTION 243 %token T_AT_OPTIMIZE 244 %token T_AT_PACKED 245 %token T_AT_PCS 246 %token T_AT_PURE 247 %token T_AT_RETURNS_TWICE 248 %token T_AT_SECTION 249 %token T_AT_SENTINEL 250 %token T_AT_STRING 251 %token T_AT_TLS_MODEL 252 %token T_AT_TUNION 253 %token T_AT_UNUSED 254 %token T_AT_USED 255 %token T_AT_VISIBILITY 256 %token T_AT_WARN_UNUSED_RESULT 257 %token T_AT_WEAK 258 259 %left T_COMMA 260 %right T_ASSIGN T_OPASSIGN 261 %right T_QUEST T_COLON 262 %left T_LOGOR 263 %left T_LOGAND 264 %left T_BITOR 265 %left T_BITXOR 266 %left T_AMPER 267 %left T_EQUALITY 268 %left T_RELATIONAL 269 %left T_SHIFT 270 %left T_ADDITIVE 271 %left T_ASTERISK T_MULTIPLICATIVE 272 %right T_UNARY T_INCDEC T_SIZEOF T_REAL T_IMAG 273 %left T_LPAREN T_LBRACK T_POINT T_ARROW 274 275 %token <y_sb> T_NAME 276 %token <y_sb> T_TYPENAME 277 %token <y_val> T_CON 278 %token <y_string> T_STRING 279 280 %type <y_sym> func_decl 281 %type <y_sym> notype_decl 282 %type <y_sym> type_decl 283 %type <y_type> typespec 284 %type <y_type> notype_typespec 285 %type <y_type> struct_spec 286 %type <y_type> enum_spec 287 %type <y_sym> struct_tag 288 %type <y_sym> enum_tag 289 %type <y_tspec> struct 290 %type <y_sym> struct_declaration 291 %type <y_sb> identifier 292 %type <y_sym> member_declaration_list_semi 293 %type <y_sym> member_declaration_list 294 %type <y_sym> member_declaration 295 %type <y_sym> notype_member_decls 296 %type <y_sym> type_member_decls 297 %type <y_sym> notype_member_decl 298 %type <y_sym> type_member_decl 299 %type <y_tnode> constant_expr 300 %type <y_tnode> array_size 301 %type <y_sym> enum_declaration 302 %type <y_sym> enumerator_list 303 %type <y_sym> enumerator 304 %type <y_sym> enumeration_constant 305 %type <y_sym> notype_direct_decl 306 %type <y_sym> type_direct_decl 307 %type <y_qual_ptr> pointer 308 %type <y_qual_ptr> asterisk 309 %type <y_sym> type_param_decl 310 %type <y_sym> param_list 311 %type <y_sym> abstract_decl_param_list 312 %type <y_sym> direct_param_decl 313 %type <y_sym> notype_param_decl 314 %type <y_sym> direct_notype_param_decl 315 %type <y_qual_ptr> type_qualifier_list_opt 316 %type <y_qual_ptr> type_qualifier_list 317 %type <y_qual_ptr> type_qualifier 318 %type <y_sym> identifier_list 319 %type <y_sym> abstract_declarator 320 %type <y_sym> direct_abstract_declarator 321 %type <y_sym> direct_abstract_declarator_postfix 322 %type <y_sym> vararg_parameter_type_list 323 %type <y_sym> parameter_type_list 324 %type <y_sym> parameter_declaration 325 %type <y_tnode> expr 326 %type <y_tnode> assignment_expression 327 %type <y_tnode> gcc_statement_expr_list 328 %type <y_tnode> gcc_statement_expr_item 329 %type <y_tnode> term 330 %type <y_tnode> generic_selection 331 %type <y_tnode> func_arg_list 332 %type <y_op> point_or_arrow 333 %type <y_type> type_name 334 %type <y_sym> abstract_declaration 335 %type <y_tnode> expr_opt 336 %type <y_string> string 337 %type <y_string> string2 338 %type <y_sb> asm_or_symbolrename_opt 339 %type <y_range> range 340 %type <y_seen_statement> block_item_list 341 %type <y_seen_statement> block_item 342 %type <y_generic> generic_assoc_list 343 %type <y_generic> generic_association 344 345 %% 346 347 program: 348 /* empty */ { 349 if (sflag) { 350 /* empty translation unit */ 351 error(272); 352 } else if (!tflag) { 353 /* empty translation unit */ 354 warning(272); 355 } 356 } 357 | translation_unit 358 ; 359 360 translation_unit: /* C99 6.9 */ 361 external_declaration 362 | translation_unit external_declaration 363 ; 364 365 external_declaration: /* C99 6.9 */ 366 asm_statement 367 | function_definition { 368 global_clean_up_decl(false); 369 clear_warning_flags(); 370 } 371 | top_level_declaration { 372 global_clean_up_decl(false); 373 clear_warning_flags(); 374 } 375 ; 376 377 /* 378 * On the top level, lint allows several forms of declarations that it doesn't 379 * allow in functions. For example, a single ';' is an empty declaration and 380 * is supported by some compilers, but in a function it would be an empty 381 * statement, not a declaration. This makes a difference in C90 mode, where 382 * a statement must not be followed by a declaration. 383 * 384 * See 'declaration' for all other declarations. 385 */ 386 top_level_declaration: /* C99 6.9 calls this 'declaration' */ 387 T_SEMI { 388 if (sflag) { 389 /* empty declaration */ 390 error(0); 391 } else if (!tflag) { 392 /* empty declaration */ 393 warning(0); 394 } 395 } 396 | begin_type end_type notype_init_decls T_SEMI { 397 if (sflag) { 398 /* old style declaration; add 'int' */ 399 error(1); 400 } else if (!tflag) { 401 /* old style declaration; add 'int' */ 402 warning(1); 403 } 404 } 405 | declaration_noerror 406 | error T_SEMI { 407 global_clean_up(); 408 } 409 | error T_RBRACE { 410 global_clean_up(); 411 } 412 ; 413 414 function_definition: /* C99 6.9.1 */ 415 func_decl { 416 if ($1->s_type->t_tspec != FUNC) { 417 /* syntax error '%s' */ 418 error(249, yytext); 419 YYERROR; 420 } 421 if ($1->s_type->t_typedef) { 422 /* ()-less function definition */ 423 error(64); 424 YYERROR; 425 } 426 funcdef($1); 427 block_level++; 428 begin_declaration_level(ARG); 429 if (lwarn == LWARN_NONE) 430 $1->s_used = true; 431 } arg_declaration_list_opt { 432 end_declaration_level(); 433 block_level--; 434 check_func_lint_directives(); 435 check_func_old_style_arguments(); 436 begin_control_statement(CS_FUNCTION_BODY); 437 } compound_statement { 438 funcend(); 439 end_control_statement(CS_FUNCTION_BODY); 440 } 441 ; 442 443 func_decl: 444 begin_type end_type notype_decl { 445 $$ = $3; 446 } 447 | begin_type declmods end_type notype_decl { 448 $$ = $4; 449 } 450 | begin_type declaration_specifiers end_type type_decl { 451 $$ = $4; 452 } 453 ; 454 455 arg_declaration_list_opt: /* C99 6.9.1p13 example 1 */ 456 /* empty */ 457 | arg_declaration_list 458 ; 459 460 arg_declaration_list: /* C99 6.9.1p13 example 1 */ 461 arg_declaration 462 | arg_declaration_list arg_declaration 463 /* XXX or better "arg_declaration error" ? */ 464 | error 465 ; 466 467 /* 468 * "arg_declaration" is separated from "declaration" because it 469 * needs other error handling. 470 */ 471 arg_declaration: 472 begin_type declmods end_type T_SEMI { 473 /* empty declaration */ 474 warning(2); 475 } 476 | begin_type declmods end_type notype_init_decls T_SEMI 477 | begin_type declaration_specifiers end_type T_SEMI { 478 if (!dcs->d_nonempty_decl) { 479 /* empty declaration */ 480 warning(2); 481 } else { 482 /* '%s' declared in argument declaration list */ 483 warning(3, type_name(dcs->d_type)); 484 } 485 } 486 | begin_type declaration_specifiers end_type type_init_decls T_SEMI { 487 if (dcs->d_nonempty_decl) { 488 /* '%s' declared in argument declaration list */ 489 warning(3, type_name(dcs->d_type)); 490 } 491 } 492 | begin_type declmods error 493 | begin_type declaration_specifiers error 494 ; 495 496 declaration: /* C99 6.7 */ 497 declaration_noerror 498 | error T_SEMI 499 ; 500 501 declaration_noerror: /* see C99 6.7 'declaration' */ 502 begin_type declmods end_type T_SEMI { 503 if (dcs->d_scl == TYPEDEF) { 504 /* typedef declares no type name */ 505 warning(72); 506 } else { 507 /* empty declaration */ 508 warning(2); 509 } 510 } 511 | begin_type declmods end_type notype_init_decls T_SEMI 512 | begin_type declaration_specifiers end_type T_SEMI { 513 if (dcs->d_scl == TYPEDEF) { 514 /* typedef declares no type name */ 515 warning(72); 516 } else if (!dcs->d_nonempty_decl) { 517 /* empty declaration */ 518 warning(2); 519 } 520 } 521 | begin_type declaration_specifiers end_type type_init_decls T_SEMI 522 ; 523 524 begin_type: 525 /* empty */ { 526 begin_type(); 527 } 528 ; 529 530 end_type: 531 /* empty */ { 532 end_type(); 533 } 534 ; 535 536 declaration_specifiers: /* C99 6.7 */ 537 typespec { 538 add_type($1); 539 } 540 | declmods typespec { 541 add_type($2); 542 } 543 | type_attribute declaration_specifiers 544 | declaration_specifiers declmod 545 | declaration_specifiers notype_typespec { 546 add_type($2); 547 } 548 ; 549 550 declmods: 551 qualifier_or_storage_class 552 | declmods declmod 553 ; 554 555 declmod: 556 qualifier_or_storage_class 557 | type_attribute 558 ; 559 560 qualifier_or_storage_class: 561 T_QUAL { 562 add_qualifier($1); 563 } 564 | T_SCLASS { 565 add_storage_class($1); 566 } 567 ; 568 569 typespec: 570 notype_typespec 571 | T_TYPENAME { 572 $$ = getsym($1)->s_type; 573 } 574 ; 575 576 notype_typespec: 577 T_TYPE { 578 $$ = gettyp($1); 579 } 580 | T_TYPEOF term { 581 $$ = $2->tn_type; 582 } 583 | struct_spec { 584 end_declaration_level(); 585 $$ = $1; 586 } 587 | enum_spec { 588 end_declaration_level(); 589 $$ = $1; 590 } 591 ; 592 593 struct_spec: 594 struct struct_tag { 595 /* 596 * STDC requires that "struct a;" always introduces 597 * a new tag if "a" is not declared at current level 598 * 599 * yychar is valid because otherwise the parser would not 600 * have been able to decide if it must shift or reduce 601 */ 602 $$ = mktag($2, $1, false, yychar == T_SEMI); 603 } 604 | struct struct_tag { 605 dcs->d_tagtyp = mktag($2, $1, true, false); 606 } struct_declaration { 607 $$ = complete_tag_struct_or_union(dcs->d_tagtyp, $4); 608 } 609 | struct { 610 dcs->d_tagtyp = mktag(NULL, $1, true, false); 611 } struct_declaration { 612 $$ = complete_tag_struct_or_union(dcs->d_tagtyp, $3); 613 } 614 | struct error { 615 symtyp = FVFT; 616 $$ = gettyp(INT); 617 } 618 ; 619 620 struct: 621 T_STRUCT_OR_UNION { 622 symtyp = FTAG; 623 begin_declaration_level($1 == STRUCT ? MOS : MOU); 624 dcs->d_offset = 0; 625 dcs->d_sou_align_in_bits = CHAR_SIZE; 626 } type_attribute_list_opt 627 ; 628 629 struct_tag: 630 identifier { 631 $$ = getsym($1); 632 } 633 ; 634 635 struct_declaration: 636 T_LBRACE { 637 symtyp = FVFT; 638 } member_declaration_list_semi T_RBRACE { 639 $$ = $3; 640 } 641 ; 642 643 member_declaration_list_semi: 644 /* empty */ { 645 $$ = NULL; 646 } 647 | member_declaration_list T_SEMI 648 | member_declaration_list { 649 if (sflag) { 650 /* syntax req. ';' after last struct/union member */ 651 error(66); 652 } else { 653 /* syntax req. ';' after last struct/union member */ 654 warning(66); 655 } 656 $$ = $1; 657 } 658 ; 659 660 member_declaration_list: 661 member_declaration 662 | member_declaration_list T_SEMI member_declaration { 663 $$ = lnklst($1, $3); 664 } 665 ; 666 667 member_declaration: 668 begin_type add_type_qualifier_list end_type { 669 /* too late, i know, but getsym() compensates it */ 670 symtyp = FMEMBER; 671 } notype_member_decls type_attribute_opt { 672 symtyp = FVFT; 673 $$ = $5; 674 } 675 | begin_type noclass_declspecs end_type { 676 symtyp = FMEMBER; 677 } type_member_decls type_attribute_opt { 678 symtyp = FVFT; 679 $$ = $5; 680 } 681 | begin_type add_type_qualifier_list end_type type_attribute_opt { 682 /* syntax error '%s' */ 683 error(249, "member without type"); 684 $$ = NULL; 685 } 686 | begin_type noclass_declspecs end_type type_attribute_opt { 687 symtyp = FVFT; 688 if (!Sflag) 689 /* anonymous struct/union members is a C9X feature */ 690 warning(49); 691 if (is_struct_or_union(dcs->d_type->t_tspec)) { 692 $$ = dcs->d_type->t_str->sou_first_member; 693 /* add all the members of the anonymous struct/union */ 694 anonymize($$); 695 } else { 696 /* syntax error '%s' */ 697 error(249, "unnamed member"); 698 $$ = NULL; 699 } 700 } 701 | error { 702 symtyp = FVFT; 703 $$ = NULL; 704 } 705 ; 706 707 noclass_declspecs: 708 noclass_declspecs_postfix 709 | type_attribute noclass_declspecs_postfix 710 ; 711 712 noclass_declspecs_postfix: 713 typespec { 714 add_type($1); 715 } 716 | add_type_qualifier_list typespec { 717 add_type($2); 718 } 719 | noclass_declspecs_postfix T_QUAL { 720 add_qualifier($2); 721 } 722 | noclass_declspecs_postfix notype_typespec { 723 add_type($2); 724 } 725 | noclass_declspecs_postfix type_attribute 726 ; 727 728 add_type_qualifier_list: 729 add_type_qualifier 730 | add_type_qualifier_list add_type_qualifier 731 ; 732 733 add_type_qualifier: 734 T_QUAL { 735 add_qualifier($1); 736 } 737 ; 738 739 notype_member_decls: 740 notype_member_decl { 741 $$ = declarator_1_struct_union($1); 742 } 743 | notype_member_decls { 744 symtyp = FMEMBER; 745 } T_COMMA type_member_decl { 746 $$ = lnklst($1, declarator_1_struct_union($4)); 747 } 748 ; 749 750 type_member_decls: 751 type_member_decl { 752 $$ = declarator_1_struct_union($1); 753 } 754 | type_member_decls { 755 symtyp = FMEMBER; 756 } T_COMMA type_member_decl { 757 $$ = lnklst($1, declarator_1_struct_union($4)); 758 } 759 ; 760 761 notype_member_decl: 762 notype_decl 763 | notype_decl T_COLON constant_expr { /* C99 6.7.2.1 */ 764 $$ = bitfield($1, to_int_constant($3, true)); 765 } 766 | { 767 symtyp = FVFT; 768 } T_COLON constant_expr { /* C99 6.7.2.1 */ 769 $$ = bitfield(NULL, to_int_constant($3, true)); 770 } 771 ; 772 773 type_member_decl: 774 type_decl 775 | type_decl T_COLON constant_expr { 776 $$ = bitfield($1, to_int_constant($3, true)); 777 } 778 | { 779 symtyp = FVFT; 780 } T_COLON constant_expr { 781 $$ = bitfield(NULL, to_int_constant($3, true)); 782 } 783 ; 784 785 enum_spec: 786 enum enum_tag { 787 $$ = mktag($2, ENUM, false, false); 788 } 789 | enum enum_tag { 790 dcs->d_tagtyp = mktag($2, ENUM, true, false); 791 } enum_declaration { 792 $$ = complete_tag_enum(dcs->d_tagtyp, $4); 793 } 794 | enum { 795 dcs->d_tagtyp = mktag(NULL, ENUM, true, false); 796 } enum_declaration { 797 $$ = complete_tag_enum(dcs->d_tagtyp, $3); 798 } 799 | enum error { 800 symtyp = FVFT; 801 $$ = gettyp(INT); 802 } 803 ; 804 805 enum: 806 T_ENUM { 807 symtyp = FTAG; 808 begin_declaration_level(CTCONST); 809 } 810 ; 811 812 enum_tag: 813 identifier { 814 $$ = getsym($1); 815 } 816 ; 817 818 enum_declaration: 819 T_LBRACE { 820 symtyp = FVFT; 821 enumval = 0; 822 } enumerator_list enumerator_list_comma_opt T_RBRACE { 823 $$ = $3; 824 } 825 ; 826 827 enumerator_list: /* C99 6.7.2.2 */ 828 enumerator 829 | enumerator_list T_COMMA enumerator { 830 $$ = lnklst($1, $3); 831 } 832 | error { 833 $$ = NULL; 834 } 835 ; 836 837 enumerator_list_comma_opt: 838 /* empty */ 839 | T_COMMA { 840 if (sflag) { 841 /* trailing ',' prohibited in enum declaration */ 842 error(54); 843 } else { 844 /* trailing ',' prohibited in enum declaration */ 845 c99ism(54); 846 } 847 } 848 ; 849 850 enumerator: /* C99 6.7.2.2 */ 851 enumeration_constant { 852 $$ = enumeration_constant($1, enumval, true); 853 } 854 | enumeration_constant T_ASSIGN constant_expr { 855 $$ = enumeration_constant($1, to_int_constant($3, true), false); 856 } 857 ; 858 859 enumeration_constant: /* C99 6.4.4.3 */ 860 identifier { 861 $$ = getsym($1); 862 } 863 ; 864 865 866 /* 867 * For an explanation of 'notype' in the following rules, see the Bison 868 * manual, section 7.1 "Semantic Info in Token Kinds". 869 */ 870 871 notype_init_decls: 872 notype_init_decl 873 | notype_init_decls T_COMMA type_init_decl 874 ; 875 876 type_init_decls: 877 type_init_decl 878 | type_init_decls T_COMMA type_init_decl 879 ; 880 881 notype_init_decl: 882 notype_decl asm_or_symbolrename_opt { 883 cgram_declare($1, false, $2); 884 check_size($1); 885 } 886 | notype_decl asm_or_symbolrename_opt { 887 begin_initialization($1); 888 cgram_declare($1, true, $2); 889 } T_ASSIGN initializer { 890 check_size($1); 891 end_initialization(); 892 } 893 ; 894 895 type_init_decl: 896 type_decl asm_or_symbolrename_opt { 897 cgram_declare($1, false, $2); 898 check_size($1); 899 } 900 | type_decl asm_or_symbolrename_opt { 901 begin_initialization($1); 902 cgram_declare($1, true, $2); 903 } T_ASSIGN initializer { 904 check_size($1); 905 end_initialization(); 906 } 907 ; 908 909 notype_decl: 910 /* TODO: removing type_attribute_list_opt here removes another 18 conflicts */ 911 type_attribute_list_opt notype_direct_decl { 912 $$ = $2; 913 } 914 | pointer type_attribute_list_opt notype_direct_decl { 915 $$ = add_pointer($3, $1); 916 } 917 ; 918 919 type_decl: 920 /* TODO: removing type_attribute_list_opt here removes another 16 conflicts */ 921 type_attribute_list_opt type_direct_decl { 922 $$ = $2; 923 } 924 | pointer type_attribute_list_opt type_direct_decl { 925 $$ = add_pointer($3, $1); 926 } 927 ; 928 929 notype_direct_decl: 930 T_NAME { 931 $$ = declarator_name(getsym($1)); 932 } 933 | T_LPAREN type_decl T_RPAREN { 934 $$ = $2; 935 } 936 | notype_direct_decl T_LBRACK T_RBRACK { 937 $$ = add_array($1, false, 0); 938 } 939 | notype_direct_decl T_LBRACK array_size T_RBRACK { 940 $$ = add_array($1, true, to_int_constant($3, false)); 941 } 942 | notype_direct_decl param_list asm_or_symbolrename_opt { 943 $$ = add_function(symbolrename($1, $3), $2); 944 end_declaration_level(); 945 block_level--; 946 } 947 | notype_direct_decl type_attribute 948 ; 949 950 type_direct_decl: 951 identifier { 952 $$ = declarator_name(getsym($1)); 953 } 954 | T_LPAREN type_decl T_RPAREN { 955 $$ = $2; 956 } 957 | type_direct_decl T_LBRACK T_RBRACK { 958 $$ = add_array($1, false, 0); 959 } 960 | type_direct_decl T_LBRACK array_size T_RBRACK { 961 $$ = add_array($1, true, to_int_constant($3, false)); 962 } 963 | type_direct_decl param_list asm_or_symbolrename_opt { 964 $$ = add_function(symbolrename($1, $3), $2); 965 end_declaration_level(); 966 block_level--; 967 } 968 | type_direct_decl type_attribute 969 ; 970 971 /* 972 * The two distinct rules type_param_decl and notype_param_decl avoid a 973 * conflict in argument lists. A typename enclosed in parentheses is always 974 * treated as a typename, not an argument name. For example, after 975 * "typedef double a;", the declaration "f(int (a));" is interpreted as 976 * "f(int (double));", not "f(int a);". 977 */ 978 type_param_decl: 979 direct_param_decl 980 | pointer direct_param_decl { 981 $$ = add_pointer($2, $1); 982 } 983 ; 984 985 notype_param_decl: 986 direct_notype_param_decl 987 | pointer direct_notype_param_decl { 988 $$ = add_pointer($2, $1); 989 } 990 ; 991 992 direct_param_decl: 993 identifier type_attribute_list_opt { 994 $$ = declarator_name(getsym($1)); 995 } 996 | T_LPAREN notype_param_decl T_RPAREN { 997 $$ = $2; 998 } 999 | direct_param_decl T_LBRACK T_RBRACK { 1000 $$ = add_array($1, false, 0); 1001 } 1002 | direct_param_decl T_LBRACK array_size T_RBRACK { 1003 $$ = add_array($1, true, to_int_constant($3, false)); 1004 } 1005 | direct_param_decl param_list asm_or_symbolrename_opt { 1006 $$ = add_function(symbolrename($1, $3), $2); 1007 end_declaration_level(); 1008 block_level--; 1009 } 1010 ; 1011 1012 direct_notype_param_decl: 1013 identifier /* XXX: missing type_attribute_list_opt? */ { 1014 $$ = declarator_name(getsym($1)); 1015 } 1016 | T_LPAREN notype_param_decl T_RPAREN { 1017 $$ = $2; 1018 } 1019 | direct_notype_param_decl T_LBRACK T_RBRACK { 1020 $$ = add_array($1, false, 0); 1021 } 1022 | direct_notype_param_decl T_LBRACK array_size T_RBRACK { 1023 $$ = add_array($1, true, to_int_constant($3, false)); 1024 } 1025 | direct_notype_param_decl param_list asm_or_symbolrename_opt { 1026 $$ = add_function(symbolrename($1, $3), $2); 1027 end_declaration_level(); 1028 block_level--; 1029 } 1030 ; 1031 1032 pointer: /* C99 6.7.5 */ 1033 asterisk type_qualifier_list_opt { 1034 $$ = merge_qualified_pointer($1, $2); 1035 } 1036 | asterisk type_qualifier_list_opt pointer { 1037 $$ = merge_qualified_pointer($1, $2); 1038 $$ = merge_qualified_pointer($$, $3); 1039 } 1040 ; 1041 1042 asterisk: 1043 T_ASTERISK { 1044 $$ = xcalloc(1, sizeof(*$$)); 1045 $$->p_pointer = true; 1046 } 1047 ; 1048 1049 type_qualifier_list_opt: 1050 /* empty */ { 1051 $$ = NULL; 1052 } 1053 | type_qualifier_list 1054 ; 1055 1056 type_qualifier_list: /* C99 6.7.5 */ 1057 type_qualifier 1058 | type_qualifier_list type_qualifier { 1059 $$ = merge_qualified_pointer($1, $2); 1060 } 1061 ; 1062 1063 type_qualifier: 1064 T_QUAL { 1065 $$ = xcalloc(1, sizeof(*$$)); 1066 if ($1 == CONST) { 1067 $$->p_const = true; 1068 } else if ($1 == VOLATILE) { 1069 $$->p_volatile = true; 1070 } else { 1071 lint_assert($1 == RESTRICT || $1 == THREAD); 1072 } 1073 } 1074 ; 1075 1076 align_as: /* See alignment-specifier in C11 6.7.5 */ 1077 typespec 1078 | constant_expr 1079 ; 1080 1081 param_list: 1082 id_list_lparen identifier_list T_RPAREN { 1083 $$ = $2; 1084 } 1085 | abstract_decl_param_list 1086 ; 1087 1088 id_list_lparen: 1089 T_LPAREN { 1090 block_level++; 1091 begin_declaration_level(PROTO_ARG); 1092 } 1093 ; 1094 1095 identifier_list: 1096 T_NAME { 1097 $$ = old_style_function_name(getsym($1)); 1098 } 1099 | identifier_list T_COMMA T_NAME { 1100 $$ = lnklst($1, old_style_function_name(getsym($3))); 1101 } 1102 | identifier_list error 1103 ; 1104 1105 abstract_decl_param_list: 1106 abstract_decl_lparen T_RPAREN type_attribute_opt { 1107 $$ = NULL; 1108 } 1109 | abstract_decl_lparen vararg_parameter_type_list T_RPAREN type_attribute_opt { 1110 dcs->d_proto = true; 1111 $$ = $2; 1112 } 1113 | abstract_decl_lparen error T_RPAREN type_attribute_opt { 1114 $$ = NULL; 1115 } 1116 ; 1117 1118 abstract_decl_lparen: 1119 T_LPAREN { 1120 block_level++; 1121 begin_declaration_level(PROTO_ARG); 1122 } 1123 ; 1124 1125 vararg_parameter_type_list: 1126 parameter_type_list 1127 | parameter_type_list T_COMMA T_ELLIPSIS { 1128 dcs->d_vararg = true; 1129 $$ = $1; 1130 } 1131 | T_ELLIPSIS { 1132 if (sflag) { 1133 /* ANSI C requires formal parameter before '...' */ 1134 error(84); 1135 } else if (!tflag) { 1136 /* ANSI C requires formal parameter before '...' */ 1137 warning(84); 1138 } 1139 dcs->d_vararg = true; 1140 $$ = NULL; 1141 } 1142 ; 1143 1144 parameter_type_list: 1145 parameter_declaration 1146 | parameter_type_list T_COMMA parameter_declaration { 1147 $$ = lnklst($1, $3); 1148 } 1149 ; 1150 1151 /* XXX: C99 6.7.5 defines the same name, but it looks completely different. */ 1152 parameter_declaration: 1153 begin_type declmods end_type { 1154 $$ = declare_argument(abstract_name(), false); 1155 } 1156 | begin_type declaration_specifiers end_type { 1157 $$ = declare_argument(abstract_name(), false); 1158 } 1159 | begin_type declmods end_type notype_param_decl { 1160 $$ = declare_argument($4, false); 1161 } 1162 | begin_type declaration_specifiers end_type type_param_decl { 1163 $$ = declare_argument($4, false); 1164 } 1165 | begin_type declmods end_type abstract_declarator { 1166 $$ = declare_argument($4, false); 1167 } 1168 | begin_type declaration_specifiers end_type abstract_declarator { 1169 $$ = declare_argument($4, false); 1170 } 1171 ; 1172 1173 asm_or_symbolrename_opt: /* expect only one */ 1174 /* empty */ { 1175 $$ = NULL; 1176 } 1177 | T_ASM T_LPAREN T_STRING T_RPAREN { 1178 freeyyv(&$3, T_STRING); 1179 $$ = NULL; 1180 } 1181 | T_SYMBOLRENAME T_LPAREN T_NAME T_RPAREN { 1182 $$ = $3; 1183 } 1184 ; 1185 1186 initializer: /* C99 6.7.8 "Initialization" */ 1187 expr %prec T_COMMA { 1188 init_expr($1); 1189 } 1190 | init_lbrace init_rbrace { 1191 /* XXX: Empty braces are not covered by C99 6.7.8. */ 1192 } 1193 | init_lbrace initializer_list comma_opt init_rbrace 1194 | error 1195 ; 1196 1197 initializer_list: /* C99 6.7.8 "Initialization" */ 1198 initializer_list_item 1199 | initializer_list T_COMMA initializer_list_item 1200 ; 1201 1202 initializer_list_item: 1203 designation initializer 1204 | initializer 1205 ; 1206 1207 designation: /* C99 6.7.8 "Initialization" */ 1208 designator_list T_ASSIGN 1209 | identifier T_COLON { 1210 /* GCC style struct or union member name in initializer */ 1211 gnuism(315); 1212 add_designator_member($1); 1213 } 1214 ; 1215 1216 designator_list: /* C99 6.7.8 "Initialization" */ 1217 designator 1218 | designator_list designator 1219 ; 1220 1221 designator: /* C99 6.7.8 "Initialization" */ 1222 T_LBRACK range T_RBRACK { 1223 add_designator_subscript($2); 1224 if (!Sflag) 1225 /* array initializer with des.s is a C9X feature */ 1226 warning(321); 1227 } 1228 | T_POINT identifier { 1229 if (!Sflag) 1230 /* struct or union member name in initializer is ... */ 1231 warning(313); 1232 add_designator_member($2); 1233 } 1234 ; 1235 1236 range: 1237 constant_expr { 1238 $$.lo = to_int_constant($1, true); 1239 $$.hi = $$.lo; 1240 } 1241 | constant_expr T_ELLIPSIS constant_expr { 1242 $$.lo = to_int_constant($1, true); 1243 $$.hi = to_int_constant($3, true); 1244 /* initialization with '[a...b]' is a GCC extension */ 1245 gnuism(340); 1246 } 1247 ; 1248 1249 init_lbrace: 1250 T_LBRACE { 1251 init_lbrace(); 1252 } 1253 ; 1254 1255 init_rbrace: 1256 T_RBRACE { 1257 init_rbrace(); 1258 } 1259 ; 1260 1261 type_name: /* C99 6.7.6 */ 1262 { 1263 begin_declaration_level(ABSTRACT); 1264 } abstract_declaration { 1265 end_declaration_level(); 1266 $$ = $2->s_type; 1267 } 1268 ; 1269 1270 abstract_declaration: 1271 begin_type add_type_qualifier_list end_type { 1272 $$ = declare_1_abstract(abstract_name()); 1273 } 1274 | begin_type noclass_declspecs end_type { 1275 $$ = declare_1_abstract(abstract_name()); 1276 } 1277 | begin_type add_type_qualifier_list end_type abstract_declarator { 1278 $$ = declare_1_abstract($4); 1279 } 1280 | begin_type noclass_declspecs end_type abstract_declarator { 1281 $$ = declare_1_abstract($4); 1282 } 1283 ; 1284 1285 abstract_declarator: /* C99 6.7.6 */ 1286 pointer { 1287 $$ = add_pointer(abstract_name(), $1); 1288 } 1289 | direct_abstract_declarator 1290 | pointer direct_abstract_declarator { 1291 $$ = add_pointer($2, $1); 1292 } 1293 | T_TYPEOF term { /* GCC extension */ 1294 $$ = mktempsym($2->tn_type); 1295 } 1296 ; 1297 1298 direct_abstract_declarator: /* C99 6.7.6 */ 1299 direct_abstract_declarator_postfix 1300 | type_attribute direct_abstract_declarator_postfix { 1301 $$ = $2; 1302 } 1303 ; 1304 1305 direct_abstract_declarator_postfix: /* C99 6.7.6 */ 1306 T_LPAREN abstract_declarator T_RPAREN { 1307 $$ = $2; 1308 } 1309 | T_LBRACK T_RBRACK { 1310 $$ = add_array(abstract_name(), false, 0); 1311 } 1312 | T_LBRACK array_size T_RBRACK { 1313 $$ = add_array(abstract_name(), true, to_int_constant($2, false)); 1314 } 1315 | direct_abstract_declarator_postfix T_LBRACK T_RBRACK { 1316 $$ = add_array($1, false, 0); 1317 } 1318 | direct_abstract_declarator_postfix 1319 T_LBRACK T_ASTERISK T_RBRACK { /* C99 */ 1320 $$ = add_array($1, false, 0); 1321 } 1322 | direct_abstract_declarator_postfix T_LBRACK array_size T_RBRACK { 1323 $$ = add_array($1, true, to_int_constant($3, false)); 1324 } 1325 | abstract_decl_param_list asm_or_symbolrename_opt { 1326 $$ = add_function(symbolrename(abstract_name(), $2), $1); 1327 end_declaration_level(); 1328 block_level--; 1329 } 1330 | direct_abstract_declarator_postfix abstract_decl_param_list 1331 asm_or_symbolrename_opt { 1332 $$ = add_function(symbolrename($1, $3), $2); 1333 end_declaration_level(); 1334 block_level--; 1335 } 1336 | direct_abstract_declarator_postfix type_attribute 1337 ; 1338 1339 array_size: 1340 type_qualifier_list_opt T_SCLASS constant_expr { 1341 /* C11 6.7.6.3p7 */ 1342 if ($2 != STATIC) 1343 yyerror("Bad attribute"); 1344 /* static array size is a C11 extension */ 1345 c11ism(343); 1346 $$ = $3; 1347 } 1348 | constant_expr 1349 ; 1350 1351 non_expr_statement: 1352 gcc_attribute T_SEMI 1353 | labeled_statement 1354 | compound_statement 1355 | selection_statement 1356 | iteration_statement 1357 | jump_statement { 1358 seen_fallthrough = false; 1359 } 1360 | asm_statement 1361 ; 1362 1363 statement: /* C99 6.8 */ 1364 expression_statement 1365 | non_expr_statement 1366 ; 1367 1368 labeled_statement: /* C99 6.8.1 */ 1369 label gcc_attribute_list_opt statement 1370 ; 1371 1372 label: 1373 T_NAME T_COLON { 1374 symtyp = FLABEL; 1375 named_label(getsym($1)); 1376 } 1377 | T_CASE constant_expr T_COLON { 1378 case_label($2); 1379 seen_fallthrough = true; 1380 } 1381 | T_CASE constant_expr T_ELLIPSIS constant_expr T_COLON { 1382 /* XXX: We don't fill all cases */ 1383 case_label($2); 1384 seen_fallthrough = true; 1385 } 1386 | T_DEFAULT T_COLON { 1387 default_label(); 1388 seen_fallthrough = true; 1389 } 1390 ; 1391 1392 compound_statement: /* C99 6.8.2 */ 1393 compound_statement_lbrace block_item_list_opt 1394 compound_statement_rbrace 1395 ; 1396 1397 compound_statement_lbrace: 1398 T_LBRACE { 1399 block_level++; 1400 mem_block_level++; 1401 begin_declaration_level(AUTO); 1402 } 1403 ; 1404 1405 compound_statement_rbrace: 1406 T_RBRACE { 1407 end_declaration_level(); 1408 freeblk(); 1409 mem_block_level--; 1410 block_level--; 1411 seen_fallthrough = false; 1412 } 1413 ; 1414 1415 block_item_list_opt: /* C99 6.8.2 */ 1416 /* empty */ 1417 | block_item_list 1418 ; 1419 1420 block_item_list: 1421 block_item 1422 | block_item_list block_item { 1423 if (!Sflag && $1 && !$2) 1424 /* declarations after statements is a C99 feature */ 1425 c99ism(327); 1426 $$ = $1 || $2; 1427 } 1428 ; 1429 1430 block_item: 1431 statement { 1432 $$ = true; 1433 restore_warning_flags(); 1434 } 1435 | declaration { 1436 $$ = false; 1437 restore_warning_flags(); 1438 } 1439 ; 1440 1441 expression_statement: /* C99 6.8.3 */ 1442 expr T_SEMI { 1443 expr($1, false, false, false, false); 1444 seen_fallthrough = false; 1445 } 1446 | T_SEMI { 1447 seen_fallthrough = false; 1448 } 1449 ; 1450 1451 selection_statement: /* C99 6.8.4 */ 1452 if_without_else { 1453 save_warning_flags(); 1454 if2(); 1455 if3(false); 1456 } 1457 | if_without_else T_ELSE { 1458 save_warning_flags(); 1459 if2(); 1460 } statement { 1461 clear_warning_flags(); 1462 if3(true); 1463 } 1464 | if_without_else T_ELSE error { 1465 clear_warning_flags(); 1466 if3(false); 1467 } 1468 | switch_expr statement { 1469 clear_warning_flags(); 1470 switch2(); 1471 } 1472 | switch_expr error { 1473 clear_warning_flags(); 1474 switch2(); 1475 } 1476 ; 1477 1478 if_without_else: /* see C99 6.8.4 */ 1479 if_expr statement 1480 | if_expr error 1481 ; 1482 1483 if_expr: /* see C99 6.8.4 */ 1484 T_IF T_LPAREN expr T_RPAREN { 1485 if1($3); 1486 clear_warning_flags(); 1487 } 1488 ; 1489 1490 switch_expr: /* see C99 6.8.4 */ 1491 T_SWITCH T_LPAREN expr T_RPAREN { 1492 switch1($3); 1493 clear_warning_flags(); 1494 } 1495 ; 1496 1497 iteration_statement: /* C99 6.8.5 */ 1498 T_WHILE T_LPAREN expr T_RPAREN { 1499 while1($3); 1500 clear_warning_flags(); 1501 } iteration_body { 1502 clear_warning_flags(); 1503 while2(); 1504 } 1505 | do statement { 1506 clear_warning_flags(); 1507 } T_WHILE T_LPAREN expr T_RPAREN T_SEMI { 1508 do2($6); 1509 seen_fallthrough = false; 1510 } 1511 | do error { 1512 clear_warning_flags(); 1513 do2(NULL); 1514 } 1515 | for_exprs iteration_body { 1516 clear_warning_flags(); 1517 for2(); 1518 end_declaration_level(); 1519 block_level--; 1520 } 1521 ; 1522 1523 iteration_body: 1524 statement 1525 | error 1526 ; 1527 1528 do: /* see C99 6.8.5 */ 1529 T_DO { 1530 do1(); 1531 } 1532 ; 1533 1534 for_start: /* see C99 6.8.5 */ 1535 T_FOR T_LPAREN { 1536 begin_declaration_level(AUTO); 1537 block_level++; 1538 } 1539 ; 1540 1541 for_exprs: /* see C99 6.8.5 */ 1542 for_start 1543 begin_type declaration_specifiers end_type notype_init_decls T_SEMI 1544 expr_opt T_SEMI 1545 expr_opt T_RPAREN { 1546 /* variable declaration in for loop */ 1547 c99ism(325); 1548 for1(NULL, $7, $9); 1549 clear_warning_flags(); 1550 } 1551 | for_start expr_opt T_SEMI expr_opt T_SEMI expr_opt T_RPAREN { 1552 for1($2, $4, $6); 1553 clear_warning_flags(); 1554 } 1555 ; 1556 1557 jump_statement: /* C99 6.8.6 */ 1558 goto identifier T_SEMI { 1559 do_goto(getsym($2)); 1560 } 1561 | goto error T_SEMI { 1562 symtyp = FVFT; 1563 } 1564 | T_CONTINUE T_SEMI { 1565 do_continue(); 1566 } 1567 | T_BREAK T_SEMI { 1568 do_break(); 1569 } 1570 | T_RETURN T_SEMI { 1571 do_return(NULL); 1572 } 1573 | T_RETURN expr T_SEMI { 1574 do_return($2); 1575 } 1576 ; 1577 1578 goto: 1579 T_GOTO { 1580 symtyp = FLABEL; 1581 } 1582 ; 1583 1584 asm_statement: 1585 T_ASM T_LPAREN read_until_rparen T_SEMI { 1586 setasm(); 1587 } 1588 | T_ASM T_QUAL T_LPAREN read_until_rparen T_SEMI { 1589 setasm(); 1590 } 1591 | T_ASM error 1592 ; 1593 1594 read_until_rparen: 1595 /* empty */ { 1596 ignore_up_to_rparen(); 1597 } 1598 ; 1599 1600 constant_expr_list_opt: 1601 /* empty */ 1602 | constant_expr_list 1603 ; 1604 1605 constant_expr_list: 1606 constant_expr 1607 | constant_expr_list T_COMMA constant_expr 1608 ; 1609 1610 constant_expr: /* C99 6.6 */ 1611 expr %prec T_ASSIGN 1612 ; 1613 1614 expr_opt: 1615 /* empty */ { 1616 $$ = NULL; 1617 } 1618 | expr 1619 ; 1620 1621 expr: /* C99 6.5 */ 1622 expr T_ASTERISK expr { 1623 $$ = build(MULT, $1, $3); 1624 } 1625 | expr T_MULTIPLICATIVE expr { 1626 $$ = build($2, $1, $3); 1627 } 1628 | expr T_ADDITIVE expr { 1629 $$ = build($2, $1, $3); 1630 } 1631 | expr T_SHIFT expr { 1632 $$ = build($2, $1, $3); 1633 } 1634 | expr T_RELATIONAL expr { 1635 $$ = build($2, $1, $3); 1636 } 1637 | expr T_EQUALITY expr { 1638 $$ = build($2, $1, $3); 1639 } 1640 | expr T_AMPER expr { 1641 $$ = build(BITAND, $1, $3); 1642 } 1643 | expr T_BITXOR expr { 1644 $$ = build(BITXOR, $1, $3); 1645 } 1646 | expr T_BITOR expr { 1647 $$ = build(BITOR, $1, $3); 1648 } 1649 | expr T_LOGAND expr { 1650 $$ = build(LOGAND, $1, $3); 1651 } 1652 | expr T_LOGOR expr { 1653 $$ = build(LOGOR, $1, $3); 1654 } 1655 | expr T_QUEST expr T_COLON expr { 1656 $$ = build(QUEST, $1, build(COLON, $3, $5)); 1657 } 1658 | expr T_ASSIGN expr { 1659 $$ = build(ASSIGN, $1, $3); 1660 } 1661 | expr T_OPASSIGN expr { 1662 $$ = build($2, $1, $3); 1663 } 1664 | expr T_COMMA expr { 1665 $$ = build(COMMA, $1, $3); 1666 } 1667 | term 1668 | generic_selection 1669 ; 1670 1671 assignment_expression: /* C99 6.5.16 */ 1672 expr %prec T_ASSIGN 1673 ; 1674 1675 term: /* see C99 6.5.1 */ 1676 T_NAME { 1677 /* XXX really necessary? */ 1678 if (yychar < 0) 1679 yychar = yylex(); 1680 $$ = new_name_node(getsym($1), yychar); 1681 } 1682 | string { 1683 $$ = new_string_node($1); 1684 } 1685 | T_CON { 1686 $$ = expr_new_constant(gettyp($1->v_tspec), $1); 1687 } 1688 | T_LPAREN expr T_RPAREN { 1689 if ($2 != NULL) 1690 $2->tn_parenthesized = true; 1691 $$ = $2; 1692 } 1693 | T_LPAREN compound_statement_lbrace gcc_statement_expr_list { 1694 block_level--; 1695 mem_block_level--; 1696 begin_initialization(mktempsym(dup_type($3->tn_type))); 1697 mem_block_level++; 1698 block_level++; 1699 /* ({ }) is a GCC extension */ 1700 gnuism(320); 1701 } compound_statement_rbrace T_RPAREN { 1702 $$ = new_name_node(*current_initsym(), 0); 1703 end_initialization(); 1704 } 1705 | term T_INCDEC { 1706 $$ = build($2 == INC ? INCAFT : DECAFT, $1, NULL); 1707 } 1708 | T_INCDEC term { 1709 $$ = build($1 == INC ? INCBEF : DECBEF, $2, NULL); 1710 } 1711 | T_ASTERISK term { 1712 $$ = build(INDIR, $2, NULL); 1713 } 1714 | T_AMPER term { 1715 $$ = build(ADDR, $2, NULL); 1716 } 1717 | T_UNARY term { 1718 $$ = build($1, $2, NULL); 1719 } 1720 | T_ADDITIVE term { 1721 if (tflag && $1 == PLUS) { 1722 /* unary + is illegal in traditional C */ 1723 warning(100); 1724 } 1725 $$ = build($1 == PLUS ? UPLUS : UMINUS, $2, NULL); 1726 } 1727 | term T_LBRACK expr T_RBRACK { 1728 $$ = build(INDIR, build(PLUS, $1, $3), NULL); 1729 } 1730 | term T_LPAREN T_RPAREN { 1731 $$ = new_function_call_node($1, NULL); 1732 } 1733 | term T_LPAREN func_arg_list T_RPAREN { 1734 $$ = new_function_call_node($1, $3); 1735 } 1736 | term point_or_arrow T_NAME { 1737 if ($1 != NULL) { 1738 sym_t *msym; 1739 /* 1740 * XXX struct_or_union_member should be integrated 1741 * in build() 1742 */ 1743 if ($2 == ARROW) { 1744 /* 1745 * must do this before struct_or_union_member 1746 * is called 1747 */ 1748 $1 = cconv($1); 1749 } 1750 msym = struct_or_union_member($1, $2, getsym($3)); 1751 $$ = build($2, $1, new_name_node(msym, 0)); 1752 } else { 1753 $$ = NULL; 1754 } 1755 } 1756 | T_REAL term { 1757 $$ = build(REAL, $2, NULL); 1758 } 1759 | T_IMAG term { 1760 $$ = build(IMAG, $2, NULL); 1761 } 1762 | T_EXTENSION term { 1763 $$ = $2; 1764 } 1765 | T_BUILTIN_OFFSETOF T_LPAREN type_name T_COMMA identifier T_RPAREN { 1766 symtyp = FMEMBER; 1767 $$ = build_offsetof($3, getsym($5)); 1768 } 1769 | T_SIZEOF term { 1770 $$ = $2 == NULL ? NULL : build_sizeof($2->tn_type); 1771 if ($$ != NULL) 1772 check_expr_misc($2, false, false, false, false, false, true); 1773 } 1774 | T_SIZEOF T_LPAREN type_name T_RPAREN %prec T_SIZEOF { 1775 $$ = build_sizeof($3); 1776 } 1777 | T_ALIGNOF T_LPAREN type_name T_RPAREN { 1778 $$ = build_alignof($3); 1779 } 1780 | T_LPAREN type_name T_RPAREN term %prec T_UNARY { 1781 $$ = cast($4, $2); 1782 } 1783 | T_LPAREN type_name T_RPAREN { /* C99 6.5.2.5 "Compound literals" */ 1784 sym_t *tmp = mktempsym($2); 1785 begin_initialization(tmp); 1786 cgram_declare(tmp, true, NULL); 1787 } init_lbrace initializer_list comma_opt init_rbrace { 1788 if (!Sflag) 1789 /* compound literals are a C9X/GCC extension */ 1790 gnuism(319); 1791 $$ = new_name_node(*current_initsym(), 0); 1792 end_initialization(); 1793 } 1794 ; 1795 1796 generic_selection: /* C11 6.5.1.1 */ 1797 T_GENERIC T_LPAREN assignment_expression T_COMMA 1798 generic_assoc_list T_RPAREN { 1799 /* generic selection requires C11 or later */ 1800 c11ism(345); 1801 $$ = build_generic_selection($3, $5); 1802 } 1803 ; 1804 1805 generic_assoc_list: /* C11 6.5.1.1 */ 1806 generic_association 1807 | generic_assoc_list T_COMMA generic_association { 1808 $3->ga_prev = $1; 1809 $$ = $3; 1810 } 1811 ; 1812 1813 generic_association: /* C11 6.5.1.1 */ 1814 type_name T_COLON assignment_expression { 1815 $$ = getblk(sizeof(*$$)); 1816 $$->ga_arg = $1; 1817 $$->ga_result = $3; 1818 } 1819 | T_DEFAULT T_COLON assignment_expression { 1820 $$ = getblk(sizeof(*$$)); 1821 $$->ga_arg = NULL; 1822 $$->ga_result = $3; 1823 } 1824 ; 1825 1826 /* 1827 * The inner part of a GCC statement-expression of the form ({ ... }). 1828 * 1829 * https://gcc.gnu.org/onlinedocs/gcc/Statement-Exprs.html 1830 */ 1831 gcc_statement_expr_list: 1832 gcc_statement_expr_item 1833 | gcc_statement_expr_list gcc_statement_expr_item { 1834 $$ = $2; 1835 } 1836 ; 1837 1838 gcc_statement_expr_item: 1839 declaration { 1840 clear_warning_flags(); 1841 $$ = NULL; 1842 } 1843 | non_expr_statement { 1844 $$ = expr_zalloc_tnode(); 1845 $$->tn_type = gettyp(VOID); 1846 } 1847 | expr T_SEMI { 1848 if ($1 == NULL) { /* in case of syntax errors */ 1849 $$ = expr_zalloc_tnode(); 1850 $$->tn_type = gettyp(VOID); 1851 } else { 1852 /* XXX: do that only on the last name */ 1853 if ($1->tn_op == NAME) 1854 $1->tn_sym->s_used = true; 1855 $$ = $1; 1856 expr($1, false, false, false, false); 1857 seen_fallthrough = false; 1858 } 1859 } 1860 ; 1861 1862 string: 1863 T_STRING 1864 | T_STRING string2 { 1865 $$ = cat_strings($1, $2); 1866 } 1867 ; 1868 1869 string2: 1870 T_STRING { 1871 if (tflag) { 1872 /* concatenated strings are illegal in traditional C */ 1873 warning(219); 1874 } 1875 $$ = $1; 1876 } 1877 | string2 T_STRING { 1878 $$ = cat_strings($1, $2); 1879 } 1880 ; 1881 1882 func_arg_list: 1883 expr %prec T_COMMA { 1884 $$ = new_function_argument_node(NULL, $1); 1885 } 1886 | func_arg_list T_COMMA expr { 1887 $$ = new_function_argument_node($1, $3); 1888 } 1889 ; 1890 1891 point_or_arrow: 1892 T_POINT { 1893 symtyp = FMEMBER; 1894 $$ = POINT; 1895 } 1896 | T_ARROW { 1897 symtyp = FMEMBER; 1898 $$ = ARROW; 1899 } 1900 ; 1901 1902 identifier: /* C99 6.4.2.1 */ 1903 T_NAME { 1904 $$ = $1; 1905 cgram_debug("name '%s'", $$->sb_name); 1906 } 1907 | T_TYPENAME { 1908 $$ = $1; 1909 cgram_debug("typename '%s'", $$->sb_name); 1910 } 1911 ; 1912 1913 comma_opt: 1914 /* empty */ 1915 | T_COMMA 1916 ; 1917 1918 /* GCC extensions */ 1919 1920 type_attribute_list_opt: 1921 /* empty */ 1922 | type_attribute_list 1923 ; 1924 1925 type_attribute_list: 1926 type_attribute 1927 | type_attribute_list type_attribute 1928 ; 1929 1930 type_attribute_opt: 1931 /* empty */ 1932 | type_attribute 1933 ; 1934 1935 type_attribute: 1936 gcc_attribute 1937 | T_ALIGNAS T_LPAREN align_as T_RPAREN 1938 | T_PACKED { 1939 addpacked(); 1940 } 1941 | T_NORETURN 1942 ; 1943 1944 gcc_attribute_list_opt: 1945 /* empty */ 1946 | gcc_attribute_list 1947 ; 1948 1949 gcc_attribute_list: 1950 gcc_attribute 1951 | gcc_attribute_list gcc_attribute 1952 ; 1953 1954 /* https://gcc.gnu.org/onlinedocs/gcc/Attribute-Syntax.html */ 1955 gcc_attribute: 1956 T_ATTRIBUTE T_LPAREN T_LPAREN { 1957 attron = true; 1958 } gcc_attribute_spec_list { 1959 attron = false; 1960 } T_RPAREN T_RPAREN 1961 ; 1962 1963 gcc_attribute_spec_list: 1964 gcc_attribute_spec 1965 | gcc_attribute_spec_list T_COMMA gcc_attribute_spec 1966 ; 1967 1968 gcc_attribute_spec: 1969 /* empty */ 1970 | T_AT_ALWAYS_INLINE 1971 | T_AT_ALIAS T_LPAREN string T_RPAREN 1972 | T_AT_ALIGNED T_LPAREN constant_expr T_RPAREN 1973 | T_AT_ALIGNED 1974 | T_AT_ALLOC_SIZE T_LPAREN constant_expr T_COMMA constant_expr T_RPAREN 1975 | T_AT_ALLOC_SIZE T_LPAREN constant_expr T_RPAREN 1976 | T_AT_BOUNDED T_LPAREN gcc_attribute_bounded 1977 T_COMMA constant_expr T_COMMA constant_expr T_RPAREN 1978 | T_AT_COLD 1979 | T_AT_COMMON 1980 | T_AT_CONSTRUCTOR T_LPAREN constant_expr T_RPAREN 1981 | T_AT_CONSTRUCTOR 1982 | T_AT_DEPRECATED T_LPAREN string T_RPAREN 1983 | T_AT_DEPRECATED 1984 | T_AT_DESTRUCTOR T_LPAREN constant_expr T_RPAREN 1985 | T_AT_DESTRUCTOR 1986 | T_AT_FALLTHROUGH { 1987 fallthru(1); 1988 } 1989 | T_AT_FORMAT T_LPAREN gcc_attribute_format T_COMMA 1990 constant_expr T_COMMA constant_expr T_RPAREN 1991 | T_AT_FORMAT_ARG T_LPAREN constant_expr T_RPAREN 1992 | T_AT_GNU_INLINE 1993 | T_AT_MALLOC 1994 | T_AT_MAY_ALIAS 1995 | T_AT_MODE T_LPAREN T_NAME T_RPAREN 1996 | T_AT_NOINLINE 1997 | T_AT_NONNULL T_LPAREN constant_expr_list_opt T_RPAREN 1998 | T_AT_NONNULL 1999 | T_AT_NONSTRING 2000 | T_AT_NORETURN 2001 | T_AT_NOTHROW 2002 | T_AT_NO_INSTRUMENT_FUNCTION 2003 | T_AT_OPTIMIZE T_LPAREN string T_RPAREN 2004 | T_AT_PACKED { 2005 addpacked(); 2006 } 2007 | T_AT_PCS T_LPAREN string T_RPAREN 2008 | T_AT_PURE 2009 | T_AT_RETURNS_TWICE 2010 | T_AT_SECTION T_LPAREN string T_RPAREN 2011 | T_AT_SENTINEL T_LPAREN constant_expr T_RPAREN 2012 | T_AT_SENTINEL 2013 | T_AT_TLS_MODEL T_LPAREN string T_RPAREN 2014 | T_AT_TUNION 2015 | T_AT_UNUSED { 2016 add_attr_used(); 2017 } 2018 | T_AT_USED { 2019 add_attr_used(); 2020 } 2021 | T_AT_VISIBILITY T_LPAREN constant_expr T_RPAREN 2022 | T_AT_WARN_UNUSED_RESULT 2023 | T_AT_WEAK 2024 | T_QUAL { 2025 if ($1 != CONST) 2026 yyerror("Bad attribute"); 2027 } 2028 ; 2029 2030 gcc_attribute_bounded: 2031 T_AT_MINBYTES 2032 | T_AT_STRING 2033 | T_AT_BUFFER 2034 ; 2035 2036 gcc_attribute_format: 2037 T_AT_FORMAT_GNU_PRINTF 2038 | T_AT_FORMAT_PRINTF 2039 | T_AT_FORMAT_SCANF 2040 | T_AT_FORMAT_STRFMON 2041 | T_AT_FORMAT_STRFTIME 2042 | T_AT_FORMAT_SYSLOG 2043 ; 2044 2045 %% 2046 2047 /* ARGSUSED */ 2048 int 2049 yyerror(const char *msg) 2050 { 2051 /* syntax error '%s' */ 2052 error(249, yytext); 2053 if (++sytxerr >= 5) 2054 norecover(); 2055 return 0; 2056 } 2057 2058 static void 2059 cgram_declare(sym_t *decl, bool initflg, sbuf_t *renaming) 2060 { 2061 declare(decl, initflg, renaming); 2062 if (renaming != NULL) 2063 freeyyv(&renaming, T_NAME); 2064 } 2065 2066 /* 2067 * Discard all input tokens up to and including the next 2068 * unmatched right paren 2069 */ 2070 static void 2071 ignore_up_to_rparen(void) 2072 { 2073 int level; 2074 2075 if (yychar < 0) 2076 yychar = yylex(); 2077 freeyyv(&yylval, yychar); 2078 2079 level = 1; 2080 while (yychar != T_RPAREN || --level > 0) { 2081 if (yychar == T_LPAREN) { 2082 level++; 2083 } else if (yychar <= 0) { 2084 break; 2085 } 2086 freeyyv(&yylval, yychar = yylex()); 2087 } 2088 2089 yyclearin; 2090 } 2091 2092 static sym_t * 2093 symbolrename(sym_t *s, sbuf_t *sb) 2094 { 2095 if (sb != NULL) 2096 s->s_rename = sb->sb_name; 2097 return s; 2098 } 2099
Indexes created Thu Oct 02 14:10:14 GMT 2025