cgram.y revision 1.281
1 %{ 2 /* $NetBSD: cgram.y,v 1.281 2021/07/10 05:03:03 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 1.281 2021/07/10 05:03:03 rillig Exp $"); 39 #endif 40 41 #include <limits.h> 42 #include <stdlib.h> 43 #include <string.h> 44 45 #include "lint1.h" 46 47 extern char *yytext; 48 49 /* 50 * Contains the level of current declaration, used for symbol table entries. 51 * 0 is the top-level, > 0 is inside a function body. 52 */ 53 int block_level; 54 55 /* 56 * level for memory allocation. Normally the same as block_level. 57 * An exception is the declaration of arguments in prototypes. Memory 58 * for these can't be freed after the declaration, but symbols must 59 * be removed from the symbol table after the declaration. 60 */ 61 int mem_block_level; 62 63 /* 64 * Save the no-warns state and restore it to avoid the problem where 65 * if (expr) { stmt } / * NOLINT * / stmt; 66 */ 67 static int olwarn = LWARN_BAD; 68 69 static void cgram_declare(sym_t *, bool, sbuf_t *); 70 static void ignore_up_to_rparen(void); 71 static sym_t *symbolrename(sym_t *, sbuf_t *); 72 73 74 #ifdef DEBUG 75 static void 76 CLEAR_WARN_FLAGS(const char *file, size_t line) 77 { 78 printf("%s:%d: %s:%zu: clearing flags\n", 79 curr_pos.p_file, curr_pos.p_line, file, line); 80 clear_warn_flags(); 81 olwarn = LWARN_BAD; 82 } 83 84 static void 85 SAVE_WARN_FLAGS(const char *file, size_t line) 86 { 87 lint_assert(olwarn == LWARN_BAD); 88 printf("%s:%d: %s:%zu: saving flags %d\n", 89 curr_pos.p_file, curr_pos.p_line, file, line, lwarn); 90 olwarn = lwarn; 91 } 92 93 static void 94 RESTORE_WARN_FLAGS(const char *file, size_t line) 95 { 96 if (olwarn != LWARN_BAD) { 97 lwarn = olwarn; 98 printf("%s:%d: %s:%zu: restoring flags %d\n", 99 curr_pos.p_file, curr_pos.p_line, file, line, lwarn); 100 olwarn = LWARN_BAD; 101 } else 102 CLEAR_WARN_FLAGS(file, line); 103 } 104 #define cgram_debug(fmt, args...) printf("cgram_debug: " fmt "\n", ##args) 105 #else 106 #define CLEAR_WARN_FLAGS(f, l) clear_warn_flags(), olwarn = LWARN_BAD 107 #define SAVE_WARN_FLAGS(f, l) olwarn = lwarn 108 #define RESTORE_WARN_FLAGS(f, l) \ 109 (void)(olwarn == LWARN_BAD ? (clear_warn_flags(), 0) : (lwarn = olwarn)) 110 #define cgram_debug(fmt, args...) do { } while (false) 111 #endif 112 113 #define clear_warning_flags() CLEAR_WARN_FLAGS(__FILE__, __LINE__) 114 #define save_warning_flags() SAVE_WARN_FLAGS(__FILE__, __LINE__) 115 #define restore_warning_flags() RESTORE_WARN_FLAGS(__FILE__, __LINE__) 116 117 /* unbind the anonymous struct members from the struct */ 118 static void 119 anonymize(sym_t *s) 120 { 121 for ( ; s != NULL; s = s->s_next) 122 s->s_styp = NULL; 123 } 124 %} 125 126 %expect 136 127 128 %union { 129 val_t *y_val; 130 sbuf_t *y_sb; 131 sym_t *y_sym; 132 op_t y_op; 133 scl_t y_scl; 134 tspec_t y_tspec; 135 tqual_t y_tqual; 136 type_t *y_type; 137 tnode_t *y_tnode; 138 range_t y_range; 139 strg_t *y_string; 140 qual_ptr *y_qual_ptr; 141 bool y_seen_statement; 142 struct generic_association *y_generic; 143 }; 144 145 %token T_LBRACE T_RBRACE T_LBRACK T_RBRACK T_LPAREN T_RPAREN 146 %token T_POINT T_ARROW 147 %token <y_op> T_UNARY 148 %token <y_op> T_INCDEC 149 %token T_SIZEOF 150 %token T_BUILTIN_OFFSETOF 151 %token T_TYPEOF 152 %token T_EXTENSION 153 %token T_ALIGNAS 154 %token T_ALIGNOF 155 %token T_ASTERISK 156 %token <y_op> T_MULTIPLICATIVE 157 %token <y_op> T_ADDITIVE 158 %token <y_op> T_SHIFT 159 %token <y_op> T_RELATIONAL 160 %token <y_op> T_EQUALITY 161 %token T_AMPER 162 %token T_BITXOR 163 %token T_BITOR 164 %token T_LOGAND 165 %token T_LOGOR 166 %token T_QUEST 167 %token T_COLON 168 %token T_ASSIGN 169 %token <y_op> T_OPASSIGN 170 %token T_COMMA 171 %token T_SEMI 172 %token T_ELLIPSIS 173 %token T_REAL 174 %token T_IMAG 175 %token T_GENERIC 176 %token T_NORETURN 177 178 /* storage classes (extern, static, auto, register and typedef) */ 179 %token <y_scl> T_SCLASS 180 181 /* 182 * predefined type keywords (char, int, short, long, unsigned, signed, 183 * float, double, void); see T_TYPENAME 184 */ 185 %token <y_tspec> T_TYPE 186 187 /* qualifiers (const, volatile, restrict, _Thread_local) */ 188 %token <y_tqual> T_QUAL 189 190 /* struct or union */ 191 %token <y_tspec> T_STRUCT_OR_UNION 192 193 /* remaining keywords */ 194 %token T_ASM 195 %token T_BREAK 196 %token T_CASE 197 %token T_CONTINUE 198 %token T_DEFAULT 199 %token T_DO 200 %token T_ELSE 201 %token T_ENUM 202 %token T_FOR 203 %token T_GOTO 204 %token T_IF 205 %token T_PACKED 206 %token T_RETURN 207 %token T_SWITCH 208 %token T_SYMBOLRENAME 209 %token T_WHILE 210 211 %token T_ATTRIBUTE 212 %token T_AT_ALIAS 213 %token T_AT_ALIGNED 214 %token T_AT_ALLOC_SIZE 215 %token T_AT_ALWAYS_INLINE 216 %token T_AT_BOUNDED 217 %token T_AT_BUFFER 218 %token T_AT_COLD 219 %token T_AT_COMMON 220 %token T_AT_CONSTRUCTOR 221 %token T_AT_DEPRECATED 222 %token T_AT_DESTRUCTOR 223 %token T_AT_FALLTHROUGH 224 %token T_AT_FORMAT 225 %token T_AT_FORMAT_ARG 226 %token T_AT_FORMAT_GNU_PRINTF 227 %token T_AT_FORMAT_PRINTF 228 %token T_AT_FORMAT_SCANF 229 %token T_AT_FORMAT_STRFMON 230 %token T_AT_FORMAT_STRFTIME 231 %token T_AT_FORMAT_SYSLOG 232 %token T_AT_GNU_INLINE 233 %token T_AT_MALLOC 234 %token T_AT_MAY_ALIAS 235 %token T_AT_MINBYTES 236 %token T_AT_MODE 237 %token T_AT_NOINLINE 238 %token T_AT_NONNULL 239 %token T_AT_NONSTRING 240 %token T_AT_NORETURN 241 %token T_AT_NOTHROW 242 %token T_AT_NO_INSTRUMENT_FUNCTION 243 %token T_AT_OPTIMIZE 244 %token T_AT_PACKED 245 %token T_AT_PCS 246 %token T_AT_PURE 247 %token T_AT_RETURNS_TWICE 248 %token T_AT_SECTION 249 %token T_AT_SENTINEL 250 %token T_AT_STRING 251 %token T_AT_TLS_MODEL 252 %token T_AT_TUNION 253 %token T_AT_UNUSED 254 %token T_AT_USED 255 %token T_AT_VISIBILITY 256 %token T_AT_WARN_UNUSED_RESULT 257 %token T_AT_WEAK 258 259 %left T_COMMA 260 %right T_ASSIGN T_OPASSIGN 261 %right T_QUEST T_COLON 262 %left T_LOGOR 263 %left T_LOGAND 264 %left T_BITOR 265 %left T_BITXOR 266 %left T_AMPER 267 %left T_EQUALITY 268 %left T_RELATIONAL 269 %left T_SHIFT 270 %left T_ADDITIVE 271 %left T_ASTERISK T_MULTIPLICATIVE 272 %right T_UNARY T_INCDEC T_SIZEOF T_REAL T_IMAG 273 %left T_LPAREN T_LBRACK T_POINT T_ARROW 274 275 %token <y_sb> T_NAME 276 %token <y_sb> T_TYPENAME 277 %token <y_val> T_CON 278 %token <y_string> T_STRING 279 280 %type <y_sym> func_decl 281 %type <y_sym> notype_decl 282 %type <y_sym> type_decl 283 %type <y_type> typespec 284 %type <y_type> clrtyp_typespec 285 %type <y_type> notype_typespec 286 %type <y_type> struct_spec 287 %type <y_type> enum_spec 288 %type <y_sym> struct_tag 289 %type <y_sym> enum_tag 290 %type <y_tspec> struct 291 %type <y_sym> struct_declaration 292 %type <y_sb> identifier 293 %type <y_sym> member_declaration_list_semi 294 %type <y_sym> member_declaration_list 295 %type <y_sym> member_declaration 296 %type <y_sym> notype_member_decls 297 %type <y_sym> type_member_decls 298 %type <y_sym> notype_member_decl 299 %type <y_sym> type_member_decl 300 %type <y_tnode> constant_expr 301 %type <y_tnode> array_size 302 %type <y_sym> enum_declaration 303 %type <y_sym> enumerator_list 304 %type <y_sym> enumerator 305 %type <y_sym> enumeration_constant 306 %type <y_sym> notype_direct_decl 307 %type <y_sym> type_direct_decl 308 %type <y_qual_ptr> pointer 309 %type <y_qual_ptr> asterisk 310 %type <y_sym> type_param_decl 311 %type <y_sym> param_list 312 %type <y_sym> abstract_decl_param_list 313 %type <y_sym> direct_param_decl 314 %type <y_sym> notype_param_decl 315 %type <y_sym> direct_notype_param_decl 316 %type <y_qual_ptr> type_qualifier_list_opt 317 %type <y_qual_ptr> type_qualifier_list 318 %type <y_qual_ptr> type_qualifier 319 %type <y_sym> identifier_list 320 %type <y_sym> abstract_declarator 321 %type <y_sym> direct_abstract_declarator 322 %type <y_sym> direct_abstract_declarator_postfix 323 %type <y_sym> vararg_parameter_type_list 324 %type <y_sym> parameter_type_list 325 %type <y_sym> parameter_declaration 326 %type <y_tnode> expr 327 %type <y_tnode> assignment_expression 328 %type <y_tnode> gcc_statement_expr_list 329 %type <y_tnode> gcc_statement_expr_item 330 %type <y_tnode> term 331 %type <y_tnode> generic_selection 332 %type <y_tnode> func_arg_list 333 %type <y_op> point_or_arrow 334 %type <y_type> type_name 335 %type <y_sym> abstract_declaration 336 %type <y_tnode> do_while_expr 337 %type <y_tnode> expr_opt 338 %type <y_string> string 339 %type <y_string> string2 340 %type <y_sb> asm_or_symbolrename_opt 341 %type <y_range> range 342 %type <y_seen_statement> block_item_list 343 %type <y_seen_statement> block_item 344 %type <y_generic> generic_assoc_list 345 %type <y_generic> generic_association 346 347 %% 348 349 program: 350 /* empty */ { 351 if (sflag) { 352 /* empty translation unit */ 353 error(272); 354 } else if (!tflag) { 355 /* empty translation unit */ 356 warning(272); 357 } 358 } 359 | translation_unit 360 ; 361 362 translation_unit: /* C99 6.9 */ 363 external_declaration 364 | translation_unit external_declaration 365 ; 366 367 external_declaration: /* C99 6.9 */ 368 asm_statement 369 | function_definition { 370 global_clean_up_decl(false); 371 clear_warning_flags(); 372 } 373 | top_level_declaration { 374 global_clean_up_decl(false); 375 clear_warning_flags(); 376 } 377 ; 378 379 /* 380 * On the top level, lint allows several forms of declarations that it doesn't 381 * allow in functions. For example, a single ';' is an empty declaration and 382 * is supported by some compilers, but in a function it would be an empty 383 * statement, not a declaration. This makes a difference in C90 mode, where 384 * a statement must not be followed by a declaration. 385 * 386 * See 'declaration' for all other declarations. 387 */ 388 top_level_declaration: /* C99 6.9 calls this 'declaration' */ 389 T_SEMI { 390 if (sflag) { 391 /* empty declaration */ 392 error(0); 393 } else if (!tflag) { 394 /* empty declaration */ 395 warning(0); 396 } 397 } 398 | clrtyp deftyp notype_init_decls T_SEMI { 399 if (sflag) { 400 /* old style declaration; add 'int' */ 401 error(1); 402 } else if (!tflag) { 403 /* old style declaration; add 'int' */ 404 warning(1); 405 } 406 } 407 | declaration_noerror 408 | error T_SEMI { 409 global_clean_up(); 410 } 411 | error T_RBRACE { 412 global_clean_up(); 413 } 414 ; 415 416 function_definition: /* C99 6.9.1 */ 417 func_decl { 418 if ($1->s_type->t_tspec != FUNC) { 419 /* syntax error '%s' */ 420 error(249, yytext); 421 YYERROR; 422 } 423 if ($1->s_type->t_typedef) { 424 /* ()-less function definition */ 425 error(64); 426 YYERROR; 427 } 428 funcdef($1); 429 block_level++; 430 begin_declaration_level(ARG); 431 if (lwarn == LWARN_NONE) 432 $1->s_used = true; 433 } arg_declaration_list_opt { 434 end_declaration_level(); 435 block_level--; 436 check_func_lint_directives(); 437 check_func_old_style_arguments(); 438 begin_control_statement(CS_FUNCTION_BODY); 439 } compound_statement { 440 funcend(); 441 end_control_statement(CS_FUNCTION_BODY); 442 } 443 ; 444 445 func_decl: 446 clrtyp deftyp notype_decl { 447 $$ = $3; 448 } 449 | declmods deftyp notype_decl { 450 $$ = $3; 451 } 452 | declaration_specifiers deftyp type_decl { 453 $$ = $3; 454 } 455 ; 456 457 arg_declaration_list_opt: /* C99 6.9.1p13 example 1 */ 458 /* empty */ 459 | arg_declaration_list 460 ; 461 462 arg_declaration_list: /* C99 6.9.1p13 example 1 */ 463 arg_declaration 464 | arg_declaration_list arg_declaration 465 /* XXX or better "arg_declaration error" ? */ 466 | error 467 ; 468 469 /* 470 * "arg_declaration" is separated from "declaration" because it 471 * needs other error handling. 472 */ 473 arg_declaration: 474 declmods deftyp T_SEMI { 475 /* empty declaration */ 476 warning(2); 477 } 478 | declmods deftyp notype_init_decls T_SEMI 479 | declaration_specifiers deftyp T_SEMI { 480 if (!dcs->d_nonempty_decl) { 481 /* empty declaration */ 482 warning(2); 483 } else { 484 /* '%s' declared in argument declaration list */ 485 warning(3, type_name(dcs->d_type)); 486 } 487 } 488 | declaration_specifiers deftyp type_init_decls T_SEMI { 489 if (dcs->d_nonempty_decl) { 490 /* '%s' declared in argument declaration list */ 491 warning(3, type_name(dcs->d_type)); 492 } 493 } 494 | declmods error 495 | declaration_specifiers error 496 ; 497 498 declaration: /* C99 6.7 */ 499 declaration_noerror 500 | error T_SEMI 501 ; 502 503 declaration_noerror: /* see C99 6.7 'declaration' */ 504 declmods deftyp T_SEMI { 505 if (dcs->d_scl == TYPEDEF) { 506 /* typedef declares no type name */ 507 warning(72); 508 } else { 509 /* empty declaration */ 510 warning(2); 511 } 512 } 513 | declmods deftyp notype_init_decls T_SEMI 514 | declaration_specifiers deftyp T_SEMI { 515 if (dcs->d_scl == TYPEDEF) { 516 /* typedef declares no type name */ 517 warning(72); 518 } else if (!dcs->d_nonempty_decl) { 519 /* empty declaration */ 520 warning(2); 521 } 522 } 523 | declaration_specifiers deftyp type_init_decls T_SEMI 524 ; 525 526 clrtyp: 527 /* empty */ { 528 clrtyp(); 529 } 530 ; 531 532 deftyp: 533 /* empty */ { 534 deftyp(); 535 } 536 ; 537 538 declaration_specifiers: /* C99 6.7 */ 539 clrtyp_typespec { 540 add_type($1); 541 } 542 | declmods typespec { 543 add_type($2); 544 } 545 | type_attribute declaration_specifiers 546 | declaration_specifiers declmod 547 | declaration_specifiers notype_typespec { 548 add_type($2); 549 } 550 ; 551 552 declmods: 553 clrtyp qualifier_or_storage_class 554 | declmods declmod 555 ; 556 557 declmod: 558 qualifier_or_storage_class 559 | type_attribute 560 ; 561 562 qualifier_or_storage_class: 563 T_QUAL { 564 add_qualifier($1); 565 } 566 | T_SCLASS { 567 add_storage_class($1); 568 } 569 ; 570 571 clrtyp_typespec: 572 clrtyp notype_typespec { 573 $$ = $2; 574 } 575 | T_TYPENAME clrtyp { 576 $$ = getsym($1)->s_type; 577 } 578 ; 579 580 typespec: 581 notype_typespec 582 | T_TYPENAME { 583 $$ = getsym($1)->s_type; 584 } 585 ; 586 587 notype_typespec: 588 T_TYPE { 589 $$ = gettyp($1); 590 } 591 | T_TYPEOF term { 592 $$ = $2->tn_type; 593 } 594 | struct_spec { 595 end_declaration_level(); 596 $$ = $1; 597 } 598 | enum_spec { 599 end_declaration_level(); 600 $$ = $1; 601 } 602 ; 603 604 struct_spec: 605 struct struct_tag { 606 /* 607 * STDC requires that "struct a;" always introduces 608 * a new tag if "a" is not declared at current level 609 * 610 * yychar is valid because otherwise the parser would not 611 * have been able to decide if it must shift or reduce 612 */ 613 $$ = mktag($2, $1, false, yychar == T_SEMI); 614 } 615 | struct struct_tag { 616 dcs->d_tagtyp = mktag($2, $1, true, false); 617 } struct_declaration { 618 $$ = complete_tag_struct_or_union(dcs->d_tagtyp, $4); 619 } 620 | struct { 621 dcs->d_tagtyp = mktag(NULL, $1, true, false); 622 } struct_declaration { 623 $$ = complete_tag_struct_or_union(dcs->d_tagtyp, $3); 624 } 625 | struct error { 626 symtyp = FVFT; 627 $$ = gettyp(INT); 628 } 629 ; 630 631 struct: 632 T_STRUCT_OR_UNION { 633 symtyp = FTAG; 634 begin_declaration_level($1 == STRUCT ? MOS : MOU); 635 dcs->d_offset = 0; 636 dcs->d_sou_align_in_bits = CHAR_SIZE; 637 } type_attribute_list_opt 638 ; 639 640 struct_tag: 641 identifier { 642 $$ = getsym($1); 643 } 644 ; 645 646 struct_declaration: 647 T_LBRACE { 648 symtyp = FVFT; 649 } member_declaration_list_semi T_RBRACE { 650 $$ = $3; 651 } 652 ; 653 654 member_declaration_list_semi: 655 /* empty */ { 656 $$ = NULL; 657 } 658 | member_declaration_list T_SEMI 659 | member_declaration_list { 660 if (sflag) { 661 /* syntax req. ';' after last struct/union member */ 662 error(66); 663 } else { 664 /* syntax req. ';' after last struct/union member */ 665 warning(66); 666 } 667 $$ = $1; 668 } 669 ; 670 671 member_declaration_list: 672 member_declaration 673 | member_declaration_list T_SEMI member_declaration { 674 $$ = lnklst($1, $3); 675 } 676 ; 677 678 member_declaration: 679 noclass_declmods deftyp { 680 /* too late, i know, but getsym() compensates it */ 681 symtyp = FMEMBER; 682 } notype_member_decls type_attribute_opt { 683 symtyp = FVFT; 684 $$ = $4; 685 } 686 | noclass_declspecs deftyp { 687 symtyp = FMEMBER; 688 } type_member_decls type_attribute_opt { 689 symtyp = FVFT; 690 $$ = $4; 691 } 692 | noclass_declmods deftyp type_attribute_opt { 693 symtyp = FVFT; 694 /* struct or union member must be named */ 695 if (!Sflag) 696 /* anonymous struct/union members is a C9X feature */ 697 warning(49); 698 /* add all the members of the anonymous struct/union */ 699 lint_assert(is_struct_or_union(dcs->d_type->t_tspec)); 700 $$ = dcs->d_type->t_str->sou_first_member; 701 anonymize($$); 702 } 703 | noclass_declspecs deftyp type_attribute_opt { 704 symtyp = FVFT; 705 /* struct or union member must be named */ 706 if (!Sflag) 707 /* anonymous struct/union members is a C9X feature */ 708 warning(49); 709 if (is_struct_or_union(dcs->d_type->t_tspec)) { 710 $$ = dcs->d_type->t_str->sou_first_member; 711 /* add all the members of the anonymous struct/union */ 712 anonymize($$); 713 } else { 714 /* syntax error '%s' */ 715 error(249, "unnamed member"); 716 $$ = NULL; 717 } 718 } 719 | error { 720 symtyp = FVFT; 721 $$ = NULL; 722 } 723 ; 724 725 noclass_declspecs: 726 noclass_declspecs_postfix 727 | type_attribute noclass_declspecs_postfix 728 ; 729 730 noclass_declspecs_postfix: 731 clrtyp_typespec { 732 add_type($1); 733 } 734 | noclass_declmods typespec { 735 add_type($2); 736 } 737 | noclass_declspecs_postfix T_QUAL { 738 add_qualifier($2); 739 } 740 | noclass_declspecs_postfix notype_typespec { 741 add_type($2); 742 } 743 | noclass_declspecs_postfix type_attribute 744 ; 745 746 noclass_declmods: 747 clrtyp T_QUAL { 748 add_qualifier($2); 749 } 750 | noclass_declmods T_QUAL { 751 add_qualifier($2); 752 } 753 ; 754 755 notype_member_decls: 756 notype_member_decl { 757 $$ = declarator_1_struct_union($1); 758 } 759 | notype_member_decls { 760 symtyp = FMEMBER; 761 } T_COMMA type_member_decl { 762 $$ = lnklst($1, declarator_1_struct_union($4)); 763 } 764 ; 765 766 type_member_decls: 767 type_member_decl { 768 $$ = declarator_1_struct_union($1); 769 } 770 | type_member_decls { 771 symtyp = FMEMBER; 772 } T_COMMA type_member_decl { 773 $$ = lnklst($1, declarator_1_struct_union($4)); 774 } 775 ; 776 777 notype_member_decl: 778 notype_decl 779 | notype_decl T_COLON constant_expr { /* C99 6.7.2.1 */ 780 $$ = bitfield($1, to_int_constant($3, true)); 781 } 782 | { 783 symtyp = FVFT; 784 } T_COLON constant_expr { /* C99 6.7.2.1 */ 785 $$ = bitfield(NULL, to_int_constant($3, true)); 786 } 787 ; 788 789 type_member_decl: 790 type_decl 791 | type_decl T_COLON constant_expr { 792 $$ = bitfield($1, to_int_constant($3, true)); 793 } 794 | { 795 symtyp = FVFT; 796 } T_COLON constant_expr { 797 $$ = bitfield(NULL, to_int_constant($3, true)); 798 } 799 ; 800 801 enum_spec: 802 enum enum_tag { 803 $$ = mktag($2, ENUM, false, false); 804 } 805 | enum enum_tag { 806 dcs->d_tagtyp = mktag($2, ENUM, true, false); 807 } enum_declaration { 808 $$ = complete_tag_enum(dcs->d_tagtyp, $4); 809 } 810 | enum { 811 dcs->d_tagtyp = mktag(NULL, ENUM, true, false); 812 } enum_declaration { 813 $$ = complete_tag_enum(dcs->d_tagtyp, $3); 814 } 815 | enum error { 816 symtyp = FVFT; 817 $$ = gettyp(INT); 818 } 819 ; 820 821 enum: 822 T_ENUM { 823 symtyp = FTAG; 824 begin_declaration_level(CTCONST); 825 } 826 ; 827 828 enum_tag: 829 identifier { 830 $$ = getsym($1); 831 } 832 ; 833 834 enum_declaration: 835 T_LBRACE { 836 symtyp = FVFT; 837 enumval = 0; 838 } enumerator_list enumerator_list_comma_opt T_RBRACE { 839 $$ = $3; 840 } 841 ; 842 843 enumerator_list: /* C99 6.7.2.2 */ 844 enumerator 845 | enumerator_list T_COMMA enumerator { 846 $$ = lnklst($1, $3); 847 } 848 | error { 849 $$ = NULL; 850 } 851 ; 852 853 enumerator_list_comma_opt: 854 /* empty */ 855 | T_COMMA { 856 if (sflag) { 857 /* trailing ',' prohibited in enum declaration */ 858 error(54); 859 } else { 860 /* trailing ',' prohibited in enum declaration */ 861 c99ism(54); 862 } 863 } 864 ; 865 866 enumerator: /* C99 6.7.2.2 */ 867 enumeration_constant { 868 $$ = enumeration_constant($1, enumval, true); 869 } 870 | enumeration_constant T_ASSIGN constant_expr { 871 $$ = enumeration_constant($1, to_int_constant($3, true), false); 872 } 873 ; 874 875 enumeration_constant: /* C99 6.4.4.3 */ 876 identifier { 877 $$ = getsym($1); 878 } 879 ; 880 881 882 /* 883 * For an explanation of 'notype' in the following rules, see the Bison 884 * manual, section 7.1 "Semantic Info in Token Kinds". 885 */ 886 887 notype_init_decls: 888 notype_init_decl 889 | notype_init_decls T_COMMA type_init_decl 890 ; 891 892 type_init_decls: 893 type_init_decl 894 | type_init_decls T_COMMA type_init_decl 895 ; 896 897 notype_init_decl: 898 notype_decl asm_or_symbolrename_opt { 899 cgram_declare($1, false, $2); 900 check_size($1); 901 } 902 | notype_decl asm_or_symbolrename_opt { 903 begin_initialization($1); 904 cgram_declare($1, true, $2); 905 } T_ASSIGN initializer { 906 check_size($1); 907 end_initialization(); 908 } 909 ; 910 911 type_init_decl: 912 type_decl asm_or_symbolrename_opt { 913 cgram_declare($1, false, $2); 914 check_size($1); 915 } 916 | type_decl asm_or_symbolrename_opt { 917 begin_initialization($1); 918 cgram_declare($1, true, $2); 919 } T_ASSIGN initializer { 920 check_size($1); 921 end_initialization(); 922 } 923 ; 924 925 notype_decl: 926 /* TODO: removing type_attribute_list_opt here removes another 18 conflicts */ 927 type_attribute_list_opt notype_direct_decl { 928 $$ = $2; 929 } 930 | pointer type_attribute_list_opt notype_direct_decl { 931 $$ = add_pointer($3, $1); 932 } 933 ; 934 935 type_decl: 936 /* TODO: removing type_attribute_list_opt here removes another 16 conflicts */ 937 type_attribute_list_opt type_direct_decl { 938 $$ = $2; 939 } 940 | pointer type_attribute_list_opt type_direct_decl { 941 $$ = add_pointer($3, $1); 942 } 943 ; 944 945 notype_direct_decl: 946 T_NAME { 947 $$ = declarator_name(getsym($1)); 948 } 949 | T_LPAREN type_decl T_RPAREN { 950 $$ = $2; 951 } 952 | notype_direct_decl T_LBRACK T_RBRACK { 953 $$ = add_array($1, false, 0); 954 } 955 | notype_direct_decl T_LBRACK array_size T_RBRACK { 956 $$ = add_array($1, true, to_int_constant($3, false)); 957 } 958 | notype_direct_decl param_list asm_or_symbolrename_opt { 959 $$ = add_function(symbolrename($1, $3), $2); 960 end_declaration_level(); 961 block_level--; 962 } 963 | notype_direct_decl type_attribute 964 ; 965 966 type_direct_decl: 967 identifier { 968 $$ = declarator_name(getsym($1)); 969 } 970 | T_LPAREN type_decl T_RPAREN { 971 $$ = $2; 972 } 973 | type_direct_decl T_LBRACK T_RBRACK { 974 $$ = add_array($1, false, 0); 975 } 976 | type_direct_decl T_LBRACK array_size T_RBRACK { 977 $$ = add_array($1, true, to_int_constant($3, false)); 978 } 979 | type_direct_decl param_list asm_or_symbolrename_opt { 980 $$ = add_function(symbolrename($1, $3), $2); 981 end_declaration_level(); 982 block_level--; 983 } 984 | type_direct_decl type_attribute 985 ; 986 987 /* 988 * The two distinct rules type_param_decl and notype_param_decl avoid a 989 * conflict in argument lists. A typename enclosed in parentheses is always 990 * treated as a typename, not an argument name. For example, after 991 * "typedef double a;", the declaration "f(int (a));" is interpreted as 992 * "f(int (double));", not "f(int a);". 993 */ 994 type_param_decl: 995 direct_param_decl 996 | pointer direct_param_decl { 997 $$ = add_pointer($2, $1); 998 } 999 ; 1000 1001 notype_param_decl: 1002 direct_notype_param_decl 1003 | pointer direct_notype_param_decl { 1004 $$ = add_pointer($2, $1); 1005 } 1006 ; 1007 1008 direct_param_decl: 1009 identifier type_attribute_list_opt { 1010 $$ = declarator_name(getsym($1)); 1011 } 1012 | T_LPAREN notype_param_decl T_RPAREN { 1013 $$ = $2; 1014 } 1015 | direct_param_decl T_LBRACK T_RBRACK { 1016 $$ = add_array($1, false, 0); 1017 } 1018 | direct_param_decl T_LBRACK array_size T_RBRACK { 1019 $$ = add_array($1, true, to_int_constant($3, false)); 1020 } 1021 | direct_param_decl param_list asm_or_symbolrename_opt { 1022 $$ = add_function(symbolrename($1, $3), $2); 1023 end_declaration_level(); 1024 block_level--; 1025 } 1026 ; 1027 1028 direct_notype_param_decl: 1029 identifier /* XXX: missing type_attribute_list_opt? */ { 1030 $$ = declarator_name(getsym($1)); 1031 } 1032 | T_LPAREN notype_param_decl T_RPAREN { 1033 $$ = $2; 1034 } 1035 | direct_notype_param_decl T_LBRACK T_RBRACK { 1036 $$ = add_array($1, false, 0); 1037 } 1038 | direct_notype_param_decl T_LBRACK array_size T_RBRACK { 1039 $$ = add_array($1, true, to_int_constant($3, false)); 1040 } 1041 | direct_notype_param_decl param_list asm_or_symbolrename_opt { 1042 $$ = add_function(symbolrename($1, $3), $2); 1043 end_declaration_level(); 1044 block_level--; 1045 } 1046 ; 1047 1048 pointer: /* C99 6.7.5 */ 1049 asterisk type_qualifier_list_opt { 1050 $$ = merge_qualified_pointer($1, $2); 1051 } 1052 | asterisk type_qualifier_list_opt pointer { 1053 $$ = merge_qualified_pointer($1, $2); 1054 $$ = merge_qualified_pointer($$, $3); 1055 } 1056 ; 1057 1058 asterisk: 1059 T_ASTERISK { 1060 $$ = xcalloc(1, sizeof(*$$)); 1061 $$->p_pointer = true; 1062 } 1063 ; 1064 1065 type_qualifier_list_opt: 1066 /* empty */ { 1067 $$ = NULL; 1068 } 1069 | type_qualifier_list 1070 ; 1071 1072 type_qualifier_list: /* C99 6.7.5 */ 1073 type_qualifier 1074 | type_qualifier_list type_qualifier { 1075 $$ = merge_qualified_pointer($1, $2); 1076 } 1077 ; 1078 1079 type_qualifier: 1080 T_QUAL { 1081 $$ = xcalloc(1, sizeof(*$$)); 1082 if ($1 == CONST) { 1083 $$->p_const = true; 1084 } else if ($1 == VOLATILE) { 1085 $$->p_volatile = true; 1086 } else { 1087 lint_assert($1 == RESTRICT || $1 == THREAD); 1088 } 1089 } 1090 ; 1091 1092 align_as: /* See alignment-specifier in C11 6.7.5 */ 1093 typespec 1094 | constant_expr 1095 ; 1096 1097 param_list: 1098 id_list_lparen identifier_list T_RPAREN { 1099 $$ = $2; 1100 } 1101 | abstract_decl_param_list 1102 ; 1103 1104 id_list_lparen: 1105 T_LPAREN { 1106 block_level++; 1107 begin_declaration_level(PROTO_ARG); 1108 } 1109 ; 1110 1111 identifier_list: 1112 T_NAME { 1113 $$ = old_style_function_name(getsym($1)); 1114 } 1115 | identifier_list T_COMMA T_NAME { 1116 $$ = lnklst($1, old_style_function_name(getsym($3))); 1117 } 1118 | identifier_list error 1119 ; 1120 1121 abstract_decl_param_list: 1122 abstract_decl_lparen T_RPAREN type_attribute_opt { 1123 $$ = NULL; 1124 } 1125 | abstract_decl_lparen vararg_parameter_type_list T_RPAREN type_attribute_opt { 1126 dcs->d_proto = true; 1127 $$ = $2; 1128 } 1129 | abstract_decl_lparen error T_RPAREN type_attribute_opt { 1130 $$ = NULL; 1131 } 1132 ; 1133 1134 abstract_decl_lparen: 1135 T_LPAREN { 1136 block_level++; 1137 begin_declaration_level(PROTO_ARG); 1138 } 1139 ; 1140 1141 vararg_parameter_type_list: 1142 parameter_type_list 1143 | parameter_type_list T_COMMA T_ELLIPSIS { 1144 dcs->d_vararg = true; 1145 $$ = $1; 1146 } 1147 | T_ELLIPSIS { 1148 if (sflag) { 1149 /* ANSI C requires formal parameter before '...' */ 1150 error(84); 1151 } else if (!tflag) { 1152 /* ANSI C requires formal parameter before '...' */ 1153 warning(84); 1154 } 1155 dcs->d_vararg = true; 1156 $$ = NULL; 1157 } 1158 ; 1159 1160 parameter_type_list: 1161 parameter_declaration 1162 | parameter_type_list T_COMMA parameter_declaration { 1163 $$ = lnklst($1, $3); 1164 } 1165 ; 1166 1167 /* XXX: C99 6.7.5 defines the same name, but it looks completely different. */ 1168 parameter_declaration: 1169 declmods deftyp { 1170 $$ = declare_argument(abstract_name(), false); 1171 } 1172 | declaration_specifiers deftyp { 1173 $$ = declare_argument(abstract_name(), false); 1174 } 1175 | declmods deftyp notype_param_decl { 1176 $$ = declare_argument($3, false); 1177 } 1178 | declaration_specifiers deftyp type_param_decl { 1179 $$ = declare_argument($3, false); 1180 } 1181 | declmods deftyp abstract_declarator { 1182 $$ = declare_argument($3, false); 1183 } 1184 | declaration_specifiers deftyp abstract_declarator { 1185 $$ = declare_argument($3, false); 1186 } 1187 ; 1188 1189 asm_or_symbolrename_opt: /* expect only one */ 1190 /* empty */ { 1191 $$ = NULL; 1192 } 1193 | T_ASM T_LPAREN T_STRING T_RPAREN { 1194 freeyyv(&$3, T_STRING); 1195 $$ = NULL; 1196 } 1197 | T_SYMBOLRENAME T_LPAREN T_NAME T_RPAREN { 1198 $$ = $3; 1199 } 1200 ; 1201 1202 initializer: /* C99 6.7.8 "Initialization" */ 1203 expr %prec T_COMMA { 1204 init_expr($1); 1205 } 1206 | init_lbrace init_rbrace { 1207 /* XXX: Empty braces are not covered by C99 6.7.8. */ 1208 } 1209 | init_lbrace initializer_list comma_opt init_rbrace 1210 | error 1211 ; 1212 1213 initializer_list: /* C99 6.7.8 "Initialization" */ 1214 initializer_list_item 1215 | initializer_list T_COMMA initializer_list_item 1216 ; 1217 1218 initializer_list_item: 1219 designation initializer 1220 | initializer 1221 ; 1222 1223 designation: /* C99 6.7.8 "Initialization" */ 1224 designator_list T_ASSIGN 1225 | identifier T_COLON { 1226 /* GCC style struct or union member name in initializer */ 1227 gnuism(315); 1228 add_designator_member($1); 1229 } 1230 ; 1231 1232 designator_list: /* C99 6.7.8 "Initialization" */ 1233 designator 1234 | designator_list designator 1235 ; 1236 1237 designator: /* C99 6.7.8 "Initialization" */ 1238 T_LBRACK range T_RBRACK { 1239 add_designator_subscript($2); 1240 if (!Sflag) 1241 /* array initializer with des.s is a C9X feature */ 1242 warning(321); 1243 } 1244 | T_POINT identifier { 1245 if (!Sflag) 1246 /* struct or union member name in initializer is ... */ 1247 warning(313); 1248 add_designator_member($2); 1249 } 1250 ; 1251 1252 range: 1253 constant_expr { 1254 $$.lo = to_int_constant($1, true); 1255 $$.hi = $$.lo; 1256 } 1257 | constant_expr T_ELLIPSIS constant_expr { 1258 $$.lo = to_int_constant($1, true); 1259 $$.hi = to_int_constant($3, true); 1260 /* initialization with '[a...b]' is a GCC extension */ 1261 gnuism(340); 1262 } 1263 ; 1264 1265 init_lbrace: 1266 T_LBRACE { 1267 init_lbrace(); 1268 } 1269 ; 1270 1271 init_rbrace: 1272 T_RBRACE { 1273 init_rbrace(); 1274 } 1275 ; 1276 1277 type_name: /* C99 6.7.6 */ 1278 { 1279 begin_declaration_level(ABSTRACT); 1280 } abstract_declaration { 1281 end_declaration_level(); 1282 $$ = $2->s_type; 1283 } 1284 ; 1285 1286 abstract_declaration: 1287 noclass_declmods deftyp { 1288 $$ = declare_1_abstract(abstract_name()); 1289 } 1290 | noclass_declspecs deftyp { 1291 $$ = declare_1_abstract(abstract_name()); 1292 } 1293 | noclass_declmods deftyp abstract_declarator { 1294 $$ = declare_1_abstract($3); 1295 } 1296 | noclass_declspecs deftyp abstract_declarator { 1297 $$ = declare_1_abstract($3); 1298 } 1299 ; 1300 1301 abstract_declarator: /* C99 6.7.6 */ 1302 pointer { 1303 $$ = add_pointer(abstract_name(), $1); 1304 } 1305 | direct_abstract_declarator 1306 | pointer direct_abstract_declarator { 1307 $$ = add_pointer($2, $1); 1308 } 1309 | T_TYPEOF term { /* GCC extension */ 1310 $$ = mktempsym($2->tn_type); 1311 } 1312 ; 1313 1314 direct_abstract_declarator: /* C99 6.7.6 */ 1315 direct_abstract_declarator_postfix 1316 | type_attribute direct_abstract_declarator_postfix { 1317 $$ = $2; 1318 } 1319 ; 1320 1321 direct_abstract_declarator_postfix: /* C99 6.7.6 */ 1322 T_LPAREN abstract_declarator T_RPAREN { 1323 $$ = $2; 1324 } 1325 | T_LBRACK T_RBRACK { 1326 $$ = add_array(abstract_name(), false, 0); 1327 } 1328 | T_LBRACK array_size T_RBRACK { 1329 $$ = add_array(abstract_name(), true, to_int_constant($2, false)); 1330 } 1331 | direct_abstract_declarator_postfix T_LBRACK T_RBRACK { 1332 $$ = add_array($1, false, 0); 1333 } 1334 | direct_abstract_declarator_postfix 1335 T_LBRACK T_ASTERISK T_RBRACK { /* C99 */ 1336 $$ = add_array($1, false, 0); 1337 } 1338 | direct_abstract_declarator_postfix T_LBRACK array_size T_RBRACK { 1339 $$ = add_array($1, true, to_int_constant($3, false)); 1340 } 1341 | abstract_decl_param_list asm_or_symbolrename_opt { 1342 $$ = add_function(symbolrename(abstract_name(), $2), $1); 1343 end_declaration_level(); 1344 block_level--; 1345 } 1346 | direct_abstract_declarator_postfix abstract_decl_param_list 1347 asm_or_symbolrename_opt { 1348 $$ = add_function(symbolrename($1, $3), $2); 1349 end_declaration_level(); 1350 block_level--; 1351 } 1352 | direct_abstract_declarator_postfix type_attribute 1353 ; 1354 1355 array_size: 1356 type_qualifier_list_opt T_SCLASS constant_expr { 1357 /* C11 6.7.6.3p7 */ 1358 if ($2 != STATIC) 1359 yyerror("Bad attribute"); 1360 /* static array size is a C11 extension */ 1361 c11ism(343); 1362 $$ = $3; 1363 } 1364 | constant_expr 1365 ; 1366 1367 non_expr_statement: 1368 type_attribute T_SEMI 1369 | labeled_statement 1370 | compound_statement 1371 | selection_statement 1372 | iteration_statement 1373 | jump_statement { 1374 seen_fallthrough = false; 1375 } 1376 | asm_statement 1377 ; 1378 1379 statement: /* C99 6.8 */ 1380 expression_statement 1381 | non_expr_statement 1382 ; 1383 1384 labeled_statement: /* C99 6.8.1 */ 1385 label gcc_attribute_list_opt statement 1386 ; 1387 1388 label: 1389 T_NAME T_COLON { 1390 symtyp = FLABEL; 1391 named_label(getsym($1)); 1392 } 1393 | T_CASE constant_expr T_COLON { 1394 case_label($2); 1395 seen_fallthrough = true; 1396 } 1397 | T_CASE constant_expr T_ELLIPSIS constant_expr T_COLON { 1398 /* XXX: We don't fill all cases */ 1399 case_label($2); 1400 seen_fallthrough = true; 1401 } 1402 | T_DEFAULT T_COLON { 1403 default_label(); 1404 seen_fallthrough = true; 1405 } 1406 ; 1407 1408 compound_statement: /* C99 6.8.2 */ 1409 compound_statement_lbrace block_item_list_opt 1410 compound_statement_rbrace 1411 ; 1412 1413 compound_statement_lbrace: 1414 T_LBRACE { 1415 block_level++; 1416 mem_block_level++; 1417 begin_declaration_level(AUTO); 1418 } 1419 ; 1420 1421 compound_statement_rbrace: 1422 T_RBRACE { 1423 end_declaration_level(); 1424 freeblk(); 1425 mem_block_level--; 1426 block_level--; 1427 seen_fallthrough = false; 1428 } 1429 ; 1430 1431 block_item_list_opt: /* C99 6.8.2 */ 1432 /* empty */ 1433 | block_item_list 1434 ; 1435 1436 block_item_list: 1437 block_item 1438 | block_item_list block_item { 1439 if (!Sflag && $1 && !$2) 1440 /* declarations after statements is a C99 feature */ 1441 c99ism(327); 1442 $$ = $1 || $2; 1443 } 1444 ; 1445 1446 block_item: 1447 statement { 1448 $$ = true; 1449 restore_warning_flags(); 1450 } 1451 | declaration { 1452 $$ = false; 1453 restore_warning_flags(); 1454 } 1455 ; 1456 1457 expression_statement: /* C99 6.8.3 */ 1458 expr T_SEMI { 1459 expr($1, false, false, false, false); 1460 seen_fallthrough = false; 1461 } 1462 | T_SEMI { 1463 seen_fallthrough = false; 1464 } 1465 ; 1466 1467 selection_statement: /* C99 6.8.4 */ 1468 if_without_else { 1469 save_warning_flags(); 1470 if2(); 1471 if3(false); 1472 } 1473 | if_without_else T_ELSE { 1474 save_warning_flags(); 1475 if2(); 1476 } statement { 1477 clear_warning_flags(); 1478 if3(true); 1479 } 1480 | if_without_else T_ELSE error { 1481 clear_warning_flags(); 1482 if3(false); 1483 } 1484 | switch_expr statement { 1485 clear_warning_flags(); 1486 switch2(); 1487 } 1488 | switch_expr error { 1489 clear_warning_flags(); 1490 switch2(); 1491 } 1492 ; 1493 1494 if_without_else: /* see C99 6.8.4 */ 1495 if_expr statement 1496 | if_expr error 1497 ; 1498 1499 if_expr: /* see C99 6.8.4 */ 1500 T_IF T_LPAREN expr T_RPAREN { 1501 if1($3); 1502 clear_warning_flags(); 1503 } 1504 ; 1505 1506 switch_expr: /* see C99 6.8.4 */ 1507 T_SWITCH T_LPAREN expr T_RPAREN { 1508 switch1($3); 1509 clear_warning_flags(); 1510 } 1511 ; 1512 1513 do_statement: /* C99 6.8.5 */ 1514 do statement { 1515 clear_warning_flags(); 1516 } 1517 ; 1518 1519 iteration_statement: /* C99 6.8.5 */ 1520 while_expr statement { 1521 clear_warning_flags(); 1522 while2(); 1523 } 1524 | while_expr error { 1525 clear_warning_flags(); 1526 while2(); 1527 } 1528 | do_statement do_while_expr { 1529 do2($2); 1530 seen_fallthrough = false; 1531 } 1532 | do error { 1533 clear_warning_flags(); 1534 do2(NULL); 1535 } 1536 | for_exprs statement { 1537 clear_warning_flags(); 1538 for2(); 1539 end_declaration_level(); 1540 block_level--; 1541 } 1542 | for_exprs error { 1543 clear_warning_flags(); 1544 for2(); 1545 end_declaration_level(); 1546 block_level--; 1547 } 1548 ; 1549 1550 while_expr: /* see C99 6.8.5 */ 1551 T_WHILE T_LPAREN expr T_RPAREN { 1552 while1($3); 1553 clear_warning_flags(); 1554 } 1555 ; 1556 1557 do: /* see C99 6.8.5 */ 1558 T_DO { 1559 do1(); 1560 } 1561 ; 1562 1563 do_while_expr: /* see C99 6.8.5 */ 1564 T_WHILE T_LPAREN expr T_RPAREN T_SEMI { 1565 $$ = $3; 1566 } 1567 ; 1568 1569 for_start: /* see C99 6.8.5 */ 1570 T_FOR T_LPAREN { 1571 begin_declaration_level(AUTO); 1572 block_level++; 1573 } 1574 ; 1575 1576 for_exprs: /* see C99 6.8.5 */ 1577 for_start declaration_specifiers deftyp notype_init_decls T_SEMI 1578 expr_opt T_SEMI expr_opt T_RPAREN { 1579 /* variable declaration in for loop */ 1580 c99ism(325); 1581 for1(NULL, $6, $8); 1582 clear_warning_flags(); 1583 } 1584 | for_start expr_opt T_SEMI expr_opt T_SEMI expr_opt T_RPAREN { 1585 for1($2, $4, $6); 1586 clear_warning_flags(); 1587 } 1588 ; 1589 1590 jump_statement: /* C99 6.8.6 */ 1591 goto identifier T_SEMI { 1592 do_goto(getsym($2)); 1593 } 1594 | goto error T_SEMI { 1595 symtyp = FVFT; 1596 } 1597 | T_CONTINUE T_SEMI { 1598 do_continue(); 1599 } 1600 | T_BREAK T_SEMI { 1601 do_break(); 1602 } 1603 | T_RETURN T_SEMI { 1604 do_return(NULL); 1605 } 1606 | T_RETURN expr T_SEMI { 1607 do_return($2); 1608 } 1609 ; 1610 1611 goto: 1612 T_GOTO { 1613 symtyp = FLABEL; 1614 } 1615 ; 1616 1617 asm_statement: 1618 T_ASM T_LPAREN read_until_rparen T_SEMI { 1619 setasm(); 1620 } 1621 | T_ASM T_QUAL T_LPAREN read_until_rparen T_SEMI { 1622 setasm(); 1623 } 1624 | T_ASM error 1625 ; 1626 1627 read_until_rparen: 1628 /* empty */ { 1629 ignore_up_to_rparen(); 1630 } 1631 ; 1632 1633 constant_expr_list_opt: 1634 /* empty */ 1635 | constant_expr_list 1636 ; 1637 1638 constant_expr_list: 1639 constant_expr 1640 | constant_expr_list T_COMMA constant_expr 1641 ; 1642 1643 constant_expr: /* C99 6.6 */ 1644 expr %prec T_ASSIGN 1645 ; 1646 1647 expr_opt: 1648 /* empty */ { 1649 $$ = NULL; 1650 } 1651 | expr 1652 ; 1653 1654 expr: /* C99 6.5 */ 1655 expr T_ASTERISK expr { 1656 $$ = build(MULT, $1, $3); 1657 } 1658 | expr T_MULTIPLICATIVE expr { 1659 $$ = build($2, $1, $3); 1660 } 1661 | expr T_ADDITIVE expr { 1662 $$ = build($2, $1, $3); 1663 } 1664 | expr T_SHIFT expr { 1665 $$ = build($2, $1, $3); 1666 } 1667 | expr T_RELATIONAL expr { 1668 $$ = build($2, $1, $3); 1669 } 1670 | expr T_EQUALITY expr { 1671 $$ = build($2, $1, $3); 1672 } 1673 | expr T_AMPER expr { 1674 $$ = build(BITAND, $1, $3); 1675 } 1676 | expr T_BITXOR expr { 1677 $$ = build(BITXOR, $1, $3); 1678 } 1679 | expr T_BITOR expr { 1680 $$ = build(BITOR, $1, $3); 1681 } 1682 | expr T_LOGAND expr { 1683 $$ = build(LOGAND, $1, $3); 1684 } 1685 | expr T_LOGOR expr { 1686 $$ = build(LOGOR, $1, $3); 1687 } 1688 | expr T_QUEST expr T_COLON expr { 1689 $$ = build(QUEST, $1, build(COLON, $3, $5)); 1690 } 1691 | expr T_ASSIGN expr { 1692 $$ = build(ASSIGN, $1, $3); 1693 } 1694 | expr T_OPASSIGN expr { 1695 $$ = build($2, $1, $3); 1696 } 1697 | expr T_COMMA expr { 1698 $$ = build(COMMA, $1, $3); 1699 } 1700 | term 1701 | generic_selection 1702 ; 1703 1704 assignment_expression: /* C99 6.5.16 */ 1705 expr %prec T_ASSIGN 1706 ; 1707 1708 term: /* see C99 6.5.1 */ 1709 T_NAME { 1710 /* XXX really necessary? */ 1711 if (yychar < 0) 1712 yychar = yylex(); 1713 $$ = new_name_node(getsym($1), yychar); 1714 } 1715 | string { 1716 $$ = new_string_node($1); 1717 } 1718 | T_CON { 1719 $$ = expr_new_constant(gettyp($1->v_tspec), $1); 1720 } 1721 | T_LPAREN expr T_RPAREN { 1722 if ($2 != NULL) 1723 $2->tn_parenthesized = true; 1724 $$ = $2; 1725 } 1726 | T_LPAREN compound_statement_lbrace gcc_statement_expr_list { 1727 block_level--; 1728 mem_block_level--; 1729 begin_initialization(mktempsym(dup_type($3->tn_type))); 1730 mem_block_level++; 1731 block_level++; 1732 /* ({ }) is a GCC extension */ 1733 gnuism(320); 1734 } compound_statement_rbrace T_RPAREN { 1735 $$ = new_name_node(*current_initsym(), 0); 1736 end_initialization(); 1737 } 1738 | term T_INCDEC { 1739 $$ = build($2 == INC ? INCAFT : DECAFT, $1, NULL); 1740 } 1741 | T_INCDEC term { 1742 $$ = build($1 == INC ? INCBEF : DECBEF, $2, NULL); 1743 } 1744 | T_ASTERISK term { 1745 $$ = build(INDIR, $2, NULL); 1746 } 1747 | T_AMPER term { 1748 $$ = build(ADDR, $2, NULL); 1749 } 1750 | T_UNARY term { 1751 $$ = build($1, $2, NULL); 1752 } 1753 | T_ADDITIVE term { 1754 if (tflag && $1 == PLUS) { 1755 /* unary + is illegal in traditional C */ 1756 warning(100); 1757 } 1758 $$ = build($1 == PLUS ? UPLUS : UMINUS, $2, NULL); 1759 } 1760 | term T_LBRACK expr T_RBRACK { 1761 $$ = build(INDIR, build(PLUS, $1, $3), NULL); 1762 } 1763 | term T_LPAREN T_RPAREN { 1764 $$ = new_function_call_node($1, NULL); 1765 } 1766 | term T_LPAREN func_arg_list T_RPAREN { 1767 $$ = new_function_call_node($1, $3); 1768 } 1769 | term point_or_arrow T_NAME { 1770 if ($1 != NULL) { 1771 sym_t *msym; 1772 /* 1773 * XXX struct_or_union_member should be integrated 1774 * in build() 1775 */ 1776 if ($2 == ARROW) { 1777 /* 1778 * must do this before struct_or_union_member 1779 * is called 1780 */ 1781 $1 = cconv($1); 1782 } 1783 msym = struct_or_union_member($1, $2, getsym($3)); 1784 $$ = build($2, $1, new_name_node(msym, 0)); 1785 } else { 1786 $$ = NULL; 1787 } 1788 } 1789 | T_REAL term { 1790 $$ = build(REAL, $2, NULL); 1791 } 1792 | T_IMAG term { 1793 $$ = build(IMAG, $2, NULL); 1794 } 1795 | T_EXTENSION term { 1796 $$ = $2; 1797 } 1798 | T_BUILTIN_OFFSETOF T_LPAREN type_name T_COMMA identifier T_RPAREN { 1799 symtyp = FMEMBER; 1800 $$ = build_offsetof($3, getsym($5)); 1801 } 1802 | T_SIZEOF term { 1803 $$ = $2 == NULL ? NULL : build_sizeof($2->tn_type); 1804 if ($$ != NULL) 1805 check_expr_misc($2, false, false, false, false, false, true); 1806 } 1807 | T_SIZEOF T_LPAREN type_name T_RPAREN %prec T_SIZEOF { 1808 $$ = build_sizeof($3); 1809 } 1810 | T_ALIGNOF T_LPAREN type_name T_RPAREN { 1811 $$ = build_alignof($3); 1812 } 1813 | T_LPAREN type_name T_RPAREN term %prec T_UNARY { 1814 $$ = cast($4, $2); 1815 } 1816 | T_LPAREN type_name T_RPAREN { /* C99 6.5.2.5 "Compound literals" */ 1817 sym_t *tmp = mktempsym($2); 1818 begin_initialization(tmp); 1819 cgram_declare(tmp, true, NULL); 1820 } init_lbrace initializer_list comma_opt init_rbrace { 1821 if (!Sflag) 1822 /* compound literals are a C9X/GCC extension */ 1823 gnuism(319); 1824 $$ = new_name_node(*current_initsym(), 0); 1825 end_initialization(); 1826 } 1827 ; 1828 1829 generic_selection: /* C11 6.5.1.1 */ 1830 T_GENERIC T_LPAREN assignment_expression T_COMMA 1831 generic_assoc_list T_RPAREN { 1832 /* generic selection requires C11 or later */ 1833 c11ism(345); 1834 $$ = build_generic_selection($3, $5); 1835 } 1836 ; 1837 1838 generic_assoc_list: /* C11 6.5.1.1 */ 1839 generic_association 1840 | generic_assoc_list T_COMMA generic_association { 1841 $3->ga_prev = $1; 1842 $$ = $3; 1843 } 1844 ; 1845 1846 generic_association: /* C11 6.5.1.1 */ 1847 type_name T_COLON assignment_expression { 1848 $$ = getblk(sizeof(*$$)); 1849 $$->ga_arg = $1; 1850 $$->ga_result = $3; 1851 } 1852 | T_DEFAULT T_COLON assignment_expression { 1853 $$ = getblk(sizeof(*$$)); 1854 $$->ga_arg = NULL; 1855 $$->ga_result = $3; 1856 } 1857 ; 1858 1859 /* 1860 * The inner part of a GCC statement-expression of the form ({ ... }). 1861 * 1862 * https://gcc.gnu.org/onlinedocs/gcc/Statement-Exprs.html 1863 */ 1864 gcc_statement_expr_list: 1865 gcc_statement_expr_item 1866 | gcc_statement_expr_list gcc_statement_expr_item { 1867 $$ = $2; 1868 } 1869 ; 1870 1871 gcc_statement_expr_item: 1872 declaration { 1873 clear_warning_flags(); 1874 $$ = NULL; 1875 } 1876 | non_expr_statement { 1877 $$ = expr_zalloc_tnode(); 1878 $$->tn_type = gettyp(VOID); 1879 } 1880 | expr T_SEMI { 1881 if ($1 == NULL) { /* in case of syntax errors */ 1882 $$ = expr_zalloc_tnode(); 1883 $$->tn_type = gettyp(VOID); 1884 } else { 1885 /* XXX: do that only on the last name */ 1886 if ($1->tn_op == NAME) 1887 $1->tn_sym->s_used = true; 1888 $$ = $1; 1889 expr($1, false, false, false, false); 1890 seen_fallthrough = false; 1891 } 1892 } 1893 ; 1894 1895 string: 1896 T_STRING 1897 | T_STRING string2 { 1898 $$ = cat_strings($1, $2); 1899 } 1900 ; 1901 1902 string2: 1903 T_STRING { 1904 if (tflag) { 1905 /* concatenated strings are illegal in traditional C */ 1906 warning(219); 1907 } 1908 $$ = $1; 1909 } 1910 | string2 T_STRING { 1911 $$ = cat_strings($1, $2); 1912 } 1913 ; 1914 1915 func_arg_list: 1916 expr %prec T_COMMA { 1917 $$ = new_function_argument_node(NULL, $1); 1918 } 1919 | func_arg_list T_COMMA expr { 1920 $$ = new_function_argument_node($1, $3); 1921 } 1922 ; 1923 1924 point_or_arrow: 1925 T_POINT { 1926 symtyp = FMEMBER; 1927 $$ = POINT; 1928 } 1929 | T_ARROW { 1930 symtyp = FMEMBER; 1931 $$ = ARROW; 1932 } 1933 ; 1934 1935 identifier: /* C99 6.4.2.1 */ 1936 T_NAME { 1937 $$ = $1; 1938 cgram_debug("name '%s'", $$->sb_name); 1939 } 1940 | T_TYPENAME { 1941 $$ = $1; 1942 cgram_debug("typename '%s'", $$->sb_name); 1943 } 1944 ; 1945 1946 comma_opt: 1947 /* empty */ 1948 | T_COMMA 1949 ; 1950 1951 /* GCC extensions */ 1952 1953 type_attribute_list_opt: 1954 /* empty */ 1955 | type_attribute_list 1956 ; 1957 1958 type_attribute_list: 1959 type_attribute 1960 | type_attribute_list type_attribute 1961 ; 1962 1963 type_attribute_opt: 1964 /* empty */ 1965 | type_attribute 1966 ; 1967 1968 type_attribute: 1969 gcc_attribute 1970 | T_ALIGNAS T_LPAREN align_as T_RPAREN 1971 | T_PACKED { 1972 addpacked(); 1973 } 1974 | T_NORETURN 1975 ; 1976 1977 gcc_attribute_list_opt: 1978 /* empty */ 1979 | gcc_attribute_list 1980 ; 1981 1982 gcc_attribute_list: 1983 gcc_attribute 1984 | gcc_attribute_list gcc_attribute 1985 ; 1986 1987 /* https://gcc.gnu.org/onlinedocs/gcc/Attribute-Syntax.html */ 1988 gcc_attribute: 1989 T_ATTRIBUTE T_LPAREN T_LPAREN { 1990 attron = true; 1991 } gcc_attribute_spec_list { 1992 attron = false; 1993 } T_RPAREN T_RPAREN 1994 ; 1995 1996 gcc_attribute_spec_list: 1997 gcc_attribute_spec 1998 | gcc_attribute_spec_list T_COMMA gcc_attribute_spec 1999 ; 2000 2001 gcc_attribute_spec: 2002 /* empty */ 2003 | T_AT_ALWAYS_INLINE 2004 | T_AT_ALIAS T_LPAREN string T_RPAREN 2005 | T_AT_ALIGNED T_LPAREN constant_expr T_RPAREN 2006 | T_AT_ALIGNED 2007 | T_AT_ALLOC_SIZE T_LPAREN constant_expr T_COMMA constant_expr T_RPAREN 2008 | T_AT_ALLOC_SIZE T_LPAREN constant_expr T_RPAREN 2009 | T_AT_BOUNDED T_LPAREN gcc_attribute_bounded 2010 T_COMMA constant_expr T_COMMA constant_expr T_RPAREN 2011 | T_AT_COLD 2012 | T_AT_COMMON 2013 | T_AT_CONSTRUCTOR T_LPAREN constant_expr T_RPAREN 2014 | T_AT_CONSTRUCTOR 2015 | T_AT_DEPRECATED T_LPAREN string T_RPAREN 2016 | T_AT_DEPRECATED 2017 | T_AT_DESTRUCTOR T_LPAREN constant_expr T_RPAREN 2018 | T_AT_DESTRUCTOR 2019 | T_AT_FALLTHROUGH { 2020 fallthru(1); 2021 } 2022 | T_AT_FORMAT T_LPAREN gcc_attribute_format T_COMMA 2023 constant_expr T_COMMA constant_expr T_RPAREN 2024 | T_AT_FORMAT_ARG T_LPAREN constant_expr T_RPAREN 2025 | T_AT_GNU_INLINE 2026 | T_AT_MALLOC 2027 | T_AT_MAY_ALIAS 2028 | T_AT_MODE T_LPAREN T_NAME T_RPAREN 2029 | T_AT_NOINLINE 2030 | T_AT_NONNULL T_LPAREN constant_expr_list_opt T_RPAREN 2031 | T_AT_NONNULL 2032 | T_AT_NONSTRING 2033 | T_AT_NORETURN 2034 | T_AT_NOTHROW 2035 | T_AT_NO_INSTRUMENT_FUNCTION 2036 | T_AT_OPTIMIZE T_LPAREN string T_RPAREN 2037 | T_AT_PACKED { 2038 addpacked(); 2039 } 2040 | T_AT_PCS T_LPAREN string T_RPAREN 2041 | T_AT_PURE 2042 | T_AT_RETURNS_TWICE 2043 | T_AT_SECTION T_LPAREN string T_RPAREN 2044 | T_AT_SENTINEL T_LPAREN constant_expr T_RPAREN 2045 | T_AT_SENTINEL 2046 | T_AT_TLS_MODEL T_LPAREN string T_RPAREN 2047 | T_AT_TUNION 2048 | T_AT_UNUSED { 2049 add_attr_used(); 2050 } 2051 | T_AT_USED { 2052 add_attr_used(); 2053 } 2054 | T_AT_VISIBILITY T_LPAREN constant_expr T_RPAREN 2055 | T_AT_WARN_UNUSED_RESULT 2056 | T_AT_WEAK 2057 | T_QUAL { 2058 if ($1 != CONST) 2059 yyerror("Bad attribute"); 2060 } 2061 ; 2062 2063 gcc_attribute_bounded: 2064 T_AT_MINBYTES 2065 | T_AT_STRING 2066 | T_AT_BUFFER 2067 ; 2068 2069 gcc_attribute_format: 2070 T_AT_FORMAT_GNU_PRINTF 2071 | T_AT_FORMAT_PRINTF 2072 | T_AT_FORMAT_SCANF 2073 | T_AT_FORMAT_STRFMON 2074 | T_AT_FORMAT_STRFTIME 2075 | T_AT_FORMAT_SYSLOG 2076 ; 2077 2078 %% 2079 2080 /* ARGSUSED */ 2081 int 2082 yyerror(const char *msg) 2083 { 2084 /* syntax error '%s' */ 2085 error(249, yytext); 2086 if (++sytxerr >= 5) 2087 norecover(); 2088 return 0; 2089 } 2090 2091 static void 2092 cgram_declare(sym_t *decl, bool initflg, sbuf_t *renaming) 2093 { 2094 declare(decl, initflg, renaming); 2095 if (renaming != NULL) 2096 freeyyv(&renaming, T_NAME); 2097 } 2098 2099 /* 2100 * Discard all input tokens up to and including the next 2101 * unmatched right paren 2102 */ 2103 static void 2104 ignore_up_to_rparen(void) 2105 { 2106 int level; 2107 2108 if (yychar < 0) 2109 yychar = yylex(); 2110 freeyyv(&yylval, yychar); 2111 2112 level = 1; 2113 while (yychar != T_RPAREN || --level > 0) { 2114 if (yychar == T_LPAREN) { 2115 level++; 2116 } else if (yychar <= 0) { 2117 break; 2118 } 2119 freeyyv(&yylval, yychar = yylex()); 2120 } 2121 2122 yyclearin; 2123 } 2124 2125 static sym_t * 2126 symbolrename(sym_t *s, sbuf_t *sb) 2127 { 2128 if (sb != NULL) 2129 s->s_rename = sb->sb_name; 2130 return s; 2131 } 2132
Indexes created Thu Oct 02 14:10:14 GMT 2025