cgram.y revision 1.275
1 %{ 2 /* $NetBSD: cgram.y,v 1.275 2021/07/09 06:37:11 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 1.275 2021/07/09 06:37:11 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 162 127 128 %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> 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> do_while_expr 336 %type <y_tnode> expr_opt 337 %type <y_string> string 338 %type <y_string> string2 339 %type <y_sb> asm_or_symbolrename_opt 340 %type <y_range> range 341 %type <y_seen_statement> block_item_list 342 %type <y_seen_statement> block_item 343 %type <y_generic> generic_assoc_list 344 %type <y_generic> generic_association 345 346 %% 347 348 program: 349 /* empty */ { 350 if (sflag) { 351 /* empty translation unit */ 352 error(272); 353 } else if (!tflag) { 354 /* empty translation unit */ 355 warning(272); 356 } 357 } 358 | translation_unit 359 ; 360 361 translation_unit: /* C99 6.9 */ 362 external_declaration 363 | translation_unit external_declaration 364 ; 365 366 external_declaration: /* C99 6.9 */ 367 asm_statement 368 | function_definition { 369 global_clean_up_decl(false); 370 clear_warning_flags(); 371 } 372 | top_level_declaration { 373 global_clean_up_decl(false); 374 clear_warning_flags(); 375 } 376 ; 377 378 /* 379 * On the top level, lint allows several forms of declarations that it doesn't 380 * allow in functions. For example, a single ';' is an empty declaration and 381 * is supported by some compilers, but in a function it would be an empty 382 * statement, not a declaration. This makes a difference in C90 mode, where 383 * a statement must not be followed by a declaration. 384 * 385 * See 'declaration' for all other declarations. 386 */ 387 top_level_declaration: /* C99 6.9 calls this 'declaration' */ 388 T_SEMI { 389 if (sflag) { 390 /* empty declaration */ 391 error(0); 392 } else if (!tflag) { 393 /* empty declaration */ 394 warning(0); 395 } 396 } 397 | clrtyp deftyp notype_init_decls T_SEMI { 398 if (sflag) { 399 /* old style declaration; add 'int' */ 400 error(1); 401 } else if (!tflag) { 402 /* old style declaration; add 'int' */ 403 warning(1); 404 } 405 } 406 | declmods deftyp T_SEMI { 407 if (dcs->d_scl == TYPEDEF) { 408 /* typedef declares no type name */ 409 warning(72); 410 } else { 411 /* empty declaration */ 412 warning(2); 413 } 414 } 415 | declmods deftyp notype_init_decls T_SEMI 416 | declaration_specifiers deftyp T_SEMI { 417 if (dcs->d_scl == TYPEDEF) { 418 /* typedef declares no type name */ 419 warning(72); 420 } else if (!dcs->d_nonempty_decl) { 421 /* empty declaration */ 422 warning(2); 423 } 424 } 425 | declaration_specifiers deftyp type_init_decls T_SEMI 426 | error T_SEMI { 427 global_clean_up(); 428 } 429 | error T_RBRACE { 430 global_clean_up(); 431 } 432 ; 433 434 function_definition: /* C99 6.9.1 */ 435 func_decl { 436 if ($1->s_type->t_tspec != FUNC) { 437 /* syntax error '%s' */ 438 error(249, yytext); 439 YYERROR; 440 } 441 if ($1->s_type->t_typedef) { 442 /* ()-less function definition */ 443 error(64); 444 YYERROR; 445 } 446 funcdef($1); 447 block_level++; 448 begin_declaration_level(ARG); 449 if (lwarn == LWARN_NONE) 450 $1->s_used = true; 451 } arg_declaration_list_opt { 452 end_declaration_level(); 453 block_level--; 454 check_func_lint_directives(); 455 check_func_old_style_arguments(); 456 begin_control_statement(CS_FUNCTION_BODY); 457 } compound_statement { 458 funcend(); 459 end_control_statement(CS_FUNCTION_BODY); 460 } 461 ; 462 463 func_decl: 464 clrtyp deftyp notype_decl { 465 $$ = $3; 466 } 467 | declmods deftyp notype_decl { 468 $$ = $3; 469 } 470 | declaration_specifiers deftyp type_decl { 471 $$ = $3; 472 } 473 ; 474 475 arg_declaration_list_opt: /* C99 6.9.1p13 example 1 */ 476 /* empty */ 477 | arg_declaration_list 478 ; 479 480 arg_declaration_list: /* C99 6.9.1p13 example 1 */ 481 arg_declaration 482 | arg_declaration_list arg_declaration 483 /* XXX or better "arg_declaration error" ? */ 484 | error 485 ; 486 487 /* 488 * "arg_declaration" is separated from "declaration" because it 489 * needs other error handling. 490 */ 491 arg_declaration: 492 declmods deftyp T_SEMI { 493 /* empty declaration */ 494 warning(2); 495 } 496 | declmods deftyp notype_init_decls T_SEMI 497 | declaration_specifiers deftyp T_SEMI { 498 if (!dcs->d_nonempty_decl) { 499 /* empty declaration */ 500 warning(2); 501 } else { 502 /* '%s' declared in argument declaration list */ 503 warning(3, type_name(dcs->d_type)); 504 } 505 } 506 | declaration_specifiers deftyp type_init_decls T_SEMI { 507 if (dcs->d_nonempty_decl) { 508 /* '%s' declared in argument declaration list */ 509 warning(3, type_name(dcs->d_type)); 510 } 511 } 512 | declmods error 513 | declaration_specifiers error 514 ; 515 516 declaration: /* C99 6.7 */ 517 declmods deftyp T_SEMI { 518 if (dcs->d_scl == TYPEDEF) { 519 /* typedef declares no type name */ 520 warning(72); 521 } else { 522 /* empty declaration */ 523 warning(2); 524 } 525 } 526 | declmods deftyp notype_init_decls T_SEMI 527 | declaration_specifiers deftyp T_SEMI { 528 if (dcs->d_scl == TYPEDEF) { 529 /* typedef declares no type name */ 530 warning(72); 531 } else if (!dcs->d_nonempty_decl) { 532 /* empty declaration */ 533 warning(2); 534 } 535 } 536 | declaration_specifiers deftyp type_init_decls T_SEMI 537 | error T_SEMI 538 ; 539 540 clrtyp: 541 /* empty */ { 542 clrtyp(); 543 } 544 ; 545 546 deftyp: 547 /* empty */ { 548 deftyp(); 549 } 550 ; 551 552 declaration_specifiers: /* C99 6.7 */ 553 clrtyp_typespec { 554 add_type($1); 555 } 556 | declmods typespec { 557 add_type($2); 558 } 559 | type_attribute declaration_specifiers 560 | declaration_specifiers declmod 561 | declaration_specifiers notype_typespec { 562 add_type($2); 563 } 564 ; 565 566 declmods: 567 clrtyp T_QUAL { 568 add_qualifier($2); 569 } 570 | clrtyp T_SCLASS { 571 add_storage_class($2); 572 } 573 | declmods declmod 574 ; 575 576 declmod: 577 T_QUAL { 578 add_qualifier($1); 579 } 580 | T_SCLASS { 581 add_storage_class($1); 582 } 583 | type_attribute 584 ; 585 586 clrtyp_typespec: 587 clrtyp notype_typespec { 588 $$ = $2; 589 } 590 | T_TYPENAME clrtyp { 591 $$ = getsym($1)->s_type; 592 } 593 ; 594 595 typespec: 596 notype_typespec 597 | T_TYPENAME { 598 $$ = getsym($1)->s_type; 599 } 600 ; 601 602 notype_typespec: 603 T_TYPE { 604 $$ = gettyp($1); 605 } 606 | T_TYPEOF term { 607 $$ = $2->tn_type; 608 } 609 | struct_spec { 610 end_declaration_level(); 611 $$ = $1; 612 } 613 | enum_spec { 614 end_declaration_level(); 615 $$ = $1; 616 } 617 ; 618 619 struct_spec: 620 struct struct_tag { 621 /* 622 * STDC requires that "struct a;" always introduces 623 * a new tag if "a" is not declared at current level 624 * 625 * yychar is valid because otherwise the parser would not 626 * have been able to decide if it must shift or reduce 627 */ 628 $$ = mktag($2, $1, false, yychar == T_SEMI); 629 } 630 | struct struct_tag { 631 dcs->d_tagtyp = mktag($2, $1, true, false); 632 } struct_declaration { 633 $$ = complete_tag_struct_or_union(dcs->d_tagtyp, $4); 634 } 635 | struct { 636 dcs->d_tagtyp = mktag(NULL, $1, true, false); 637 } struct_declaration { 638 $$ = complete_tag_struct_or_union(dcs->d_tagtyp, $3); 639 } 640 | struct error { 641 symtyp = FVFT; 642 $$ = gettyp(INT); 643 } 644 ; 645 646 struct: 647 T_STRUCT_OR_UNION { 648 symtyp = FTAG; 649 begin_declaration_level($1 == STRUCT ? MOS : MOU); 650 dcs->d_offset = 0; 651 dcs->d_sou_align_in_bits = CHAR_SIZE; 652 } type_attribute_list_opt 653 ; 654 655 struct_tag: 656 identifier { 657 $$ = getsym($1); 658 } 659 ; 660 661 struct_declaration: 662 T_LBRACE { 663 symtyp = FVFT; 664 } member_declaration_list_semi T_RBRACE { 665 $$ = $3; 666 } 667 ; 668 669 member_declaration_list_semi: 670 /* empty */ { 671 $$ = NULL; 672 } 673 | member_declaration_list T_SEMI 674 | member_declaration_list { 675 if (sflag) { 676 /* syntax req. ';' after last struct/union member */ 677 error(66); 678 } else { 679 /* syntax req. ';' after last struct/union member */ 680 warning(66); 681 } 682 $$ = $1; 683 } 684 ; 685 686 member_declaration_list: 687 member_declaration 688 | member_declaration_list T_SEMI member_declaration { 689 $$ = lnklst($1, $3); 690 } 691 ; 692 693 member_declaration: 694 noclass_declmods deftyp { 695 /* too late, i know, but getsym() compensates it */ 696 symtyp = FMEMBER; 697 } notype_member_decls type_attribute_opt { 698 symtyp = FVFT; 699 $$ = $4; 700 } 701 | noclass_declspecs deftyp { 702 symtyp = FMEMBER; 703 } type_member_decls type_attribute_opt { 704 symtyp = FVFT; 705 $$ = $4; 706 } 707 | noclass_declmods deftyp type_attribute_opt { 708 symtyp = FVFT; 709 /* struct or union member must be named */ 710 if (!Sflag) 711 /* anonymous struct/union members is a C9X feature */ 712 warning(49); 713 /* add all the members of the anonymous struct/union */ 714 lint_assert(is_struct_or_union(dcs->d_type->t_tspec)); 715 $$ = dcs->d_type->t_str->sou_first_member; 716 anonymize($$); 717 } 718 | noclass_declspecs deftyp type_attribute_opt { 719 symtyp = FVFT; 720 /* struct or union member must be named */ 721 if (!Sflag) 722 /* anonymous struct/union members is a C9X feature */ 723 warning(49); 724 if (is_struct_or_union(dcs->d_type->t_tspec)) { 725 $$ = dcs->d_type->t_str->sou_first_member; 726 /* add all the members of the anonymous struct/union */ 727 anonymize($$); 728 } else { 729 /* syntax error '%s' */ 730 error(249, "unnamed member"); 731 $$ = NULL; 732 } 733 } 734 | error { 735 symtyp = FVFT; 736 $$ = NULL; 737 } 738 ; 739 740 /* 741 * XXX: shift/reduce conflict, caused by: 742 * type_attribute noclass_declspecs 743 * noclass_declspecs type_attribute 744 */ 745 noclass_declspecs: 746 clrtyp_typespec { 747 add_type($1); 748 } 749 | type_attribute noclass_declspecs 750 | noclass_declmods typespec { 751 add_type($2); 752 } 753 | noclass_declspecs T_QUAL { 754 add_qualifier($2); 755 } 756 | noclass_declspecs notype_typespec { 757 add_type($2); 758 } 759 | noclass_declspecs type_attribute 760 ; 761 762 noclass_declmods: 763 clrtyp T_QUAL { 764 add_qualifier($2); 765 } 766 | noclass_declmods T_QUAL { 767 add_qualifier($2); 768 } 769 ; 770 771 notype_member_decls: 772 notype_member_decl { 773 $$ = declarator_1_struct_union($1); 774 } 775 | notype_member_decls { 776 symtyp = FMEMBER; 777 } T_COMMA type_member_decl { 778 $$ = lnklst($1, declarator_1_struct_union($4)); 779 } 780 ; 781 782 type_member_decls: 783 type_member_decl { 784 $$ = declarator_1_struct_union($1); 785 } 786 | type_member_decls { 787 symtyp = FMEMBER; 788 } T_COMMA type_member_decl { 789 $$ = lnklst($1, declarator_1_struct_union($4)); 790 } 791 ; 792 793 notype_member_decl: 794 notype_decl 795 | notype_decl T_COLON constant_expr { /* C99 6.7.2.1 */ 796 $$ = bitfield($1, to_int_constant($3, true)); 797 } 798 | { 799 symtyp = FVFT; 800 } T_COLON constant_expr { /* C99 6.7.2.1 */ 801 $$ = bitfield(NULL, to_int_constant($3, true)); 802 } 803 ; 804 805 type_member_decl: 806 type_decl 807 | type_decl T_COLON constant_expr { 808 $$ = bitfield($1, to_int_constant($3, true)); 809 } 810 | { 811 symtyp = FVFT; 812 } T_COLON constant_expr { 813 $$ = bitfield(NULL, to_int_constant($3, true)); 814 } 815 ; 816 817 enum_spec: 818 enum enum_tag { 819 $$ = mktag($2, ENUM, false, false); 820 } 821 | enum enum_tag { 822 dcs->d_tagtyp = mktag($2, ENUM, true, false); 823 } enum_declaration { 824 $$ = complete_tag_enum(dcs->d_tagtyp, $4); 825 } 826 | enum { 827 dcs->d_tagtyp = mktag(NULL, ENUM, true, false); 828 } enum_declaration { 829 $$ = complete_tag_enum(dcs->d_tagtyp, $3); 830 } 831 | enum error { 832 symtyp = FVFT; 833 $$ = gettyp(INT); 834 } 835 ; 836 837 enum: 838 T_ENUM { 839 symtyp = FTAG; 840 begin_declaration_level(CTCONST); 841 } 842 ; 843 844 enum_tag: 845 identifier { 846 $$ = getsym($1); 847 } 848 ; 849 850 enum_declaration: 851 T_LBRACE { 852 symtyp = FVFT; 853 enumval = 0; 854 } enumerator_list enumerator_list_comma_opt T_RBRACE { 855 $$ = $3; 856 } 857 ; 858 859 enumerator_list: /* C99 6.7.2.2 */ 860 enumerator 861 | enumerator_list T_COMMA enumerator { 862 $$ = lnklst($1, $3); 863 } 864 | error { 865 $$ = NULL; 866 } 867 ; 868 869 enumerator_list_comma_opt: 870 /* empty */ 871 | T_COMMA { 872 if (sflag) { 873 /* trailing ',' prohibited in enum declaration */ 874 error(54); 875 } else { 876 /* trailing ',' prohibited in enum declaration */ 877 c99ism(54); 878 } 879 } 880 ; 881 882 enumerator: /* C99 6.7.2.2 */ 883 enumeration_constant { 884 $$ = enumeration_constant($1, enumval, true); 885 } 886 | enumeration_constant T_ASSIGN constant_expr { 887 $$ = enumeration_constant($1, to_int_constant($3, true), false); 888 } 889 ; 890 891 enumeration_constant: /* C99 6.4.4.3 */ 892 identifier { 893 $$ = getsym($1); 894 } 895 ; 896 897 898 /* 899 * For an explanation of 'notype' in the following rules, see the Bison 900 * manual, section 7.1 "Semantic Info in Token Kinds". 901 */ 902 903 notype_init_decls: 904 notype_init_decl 905 | notype_init_decls T_COMMA type_init_decl 906 ; 907 908 type_init_decls: 909 type_init_decl 910 | type_init_decls T_COMMA type_init_decl 911 ; 912 913 notype_init_decl: 914 notype_decl asm_or_symbolrename_opt { 915 cgram_declare($1, false, $2); 916 check_size($1); 917 } 918 | notype_decl asm_or_symbolrename_opt { 919 begin_initialization($1); 920 cgram_declare($1, true, $2); 921 } T_ASSIGN initializer { 922 check_size($1); 923 end_initialization(); 924 } 925 ; 926 927 type_init_decl: 928 type_decl asm_or_symbolrename_opt { 929 cgram_declare($1, false, $2); 930 check_size($1); 931 } 932 | type_decl asm_or_symbolrename_opt { 933 begin_initialization($1); 934 cgram_declare($1, true, $2); 935 } T_ASSIGN initializer { 936 check_size($1); 937 end_initialization(); 938 } 939 ; 940 941 notype_decl: 942 notype_direct_decl 943 | pointer notype_direct_decl { 944 $$ = add_pointer($2, $1); 945 } 946 ; 947 948 type_decl: 949 type_direct_decl 950 | pointer type_direct_decl { 951 $$ = add_pointer($2, $1); 952 } 953 ; 954 955 /* 956 * XXX: shift/reduce conflict, caused by: 957 * type_attribute notype_direct_decl 958 * notype_direct_decl type_attribute 959 */ 960 notype_direct_decl: 961 T_NAME { 962 $$ = declarator_name(getsym($1)); 963 } 964 | T_LPAREN type_decl T_RPAREN { 965 $$ = $2; 966 } 967 | type_attribute notype_direct_decl { 968 $$ = $2; 969 } 970 | notype_direct_decl T_LBRACK T_RBRACK { 971 $$ = add_array($1, false, 0); 972 } 973 | notype_direct_decl T_LBRACK array_size T_RBRACK { 974 $$ = add_array($1, true, to_int_constant($3, false)); 975 } 976 | notype_direct_decl param_list asm_or_symbolrename_opt { 977 $$ = add_function(symbolrename($1, $3), $2); 978 end_declaration_level(); 979 block_level--; 980 } 981 | notype_direct_decl type_attribute 982 ; 983 984 /* 985 * XXX: shift/reduce conflict, caused by: 986 * type_attribute type_direct_decl 987 * type_direct_decl type_attribute 988 */ 989 type_direct_decl: 990 identifier { 991 $$ = declarator_name(getsym($1)); 992 } 993 | T_LPAREN type_decl T_RPAREN { 994 $$ = $2; 995 } 996 | type_attribute type_direct_decl { 997 $$ = $2; 998 } 999 | type_direct_decl T_LBRACK T_RBRACK { 1000 $$ = add_array($1, false, 0); 1001 } 1002 | type_direct_decl T_LBRACK array_size T_RBRACK { 1003 $$ = add_array($1, true, to_int_constant($3, false)); 1004 } 1005 | type_direct_decl param_list asm_or_symbolrename_opt { 1006 $$ = add_function(symbolrename($1, $3), $2); 1007 end_declaration_level(); 1008 block_level--; 1009 } 1010 | type_direct_decl type_attribute 1011 ; 1012 1013 /* 1014 * The two distinct rules type_param_decl and notype_param_decl avoid a 1015 * conflict in argument lists. A typename enclosed in parentheses is always 1016 * treated as a typename, not an argument name. For example, after 1017 * "typedef double a;", the declaration "f(int (a));" is interpreted as 1018 * "f(int (double));", not "f(int a);". 1019 */ 1020 type_param_decl: 1021 direct_param_decl 1022 | pointer direct_param_decl { 1023 $$ = add_pointer($2, $1); 1024 } 1025 ; 1026 1027 notype_param_decl: 1028 direct_notype_param_decl 1029 | pointer direct_notype_param_decl { 1030 $$ = add_pointer($2, $1); 1031 } 1032 ; 1033 1034 direct_param_decl: 1035 identifier type_attribute_list_opt { 1036 $$ = declarator_name(getsym($1)); 1037 } 1038 | T_LPAREN notype_param_decl T_RPAREN { 1039 $$ = $2; 1040 } 1041 | direct_param_decl T_LBRACK T_RBRACK { 1042 $$ = add_array($1, false, 0); 1043 } 1044 | direct_param_decl T_LBRACK array_size T_RBRACK { 1045 $$ = add_array($1, true, to_int_constant($3, false)); 1046 } 1047 | direct_param_decl param_list asm_or_symbolrename_opt { 1048 $$ = add_function(symbolrename($1, $3), $2); 1049 end_declaration_level(); 1050 block_level--; 1051 } 1052 ; 1053 1054 direct_notype_param_decl: 1055 identifier /* XXX: missing type_attribute_list_opt? */ { 1056 $$ = declarator_name(getsym($1)); 1057 } 1058 | T_LPAREN notype_param_decl T_RPAREN { 1059 $$ = $2; 1060 } 1061 | direct_notype_param_decl T_LBRACK T_RBRACK { 1062 $$ = add_array($1, false, 0); 1063 } 1064 | direct_notype_param_decl T_LBRACK array_size T_RBRACK { 1065 $$ = add_array($1, true, to_int_constant($3, false)); 1066 } 1067 | direct_notype_param_decl param_list asm_or_symbolrename_opt { 1068 $$ = add_function(symbolrename($1, $3), $2); 1069 end_declaration_level(); 1070 block_level--; 1071 } 1072 ; 1073 1074 pointer: /* C99 6.7.5 */ 1075 asterisk type_qualifier_list_opt { 1076 $$ = merge_qualified_pointer($1, $2); 1077 } 1078 | asterisk type_qualifier_list_opt pointer { 1079 $$ = merge_qualified_pointer($1, $2); 1080 $$ = merge_qualified_pointer($$, $3); 1081 } 1082 ; 1083 1084 asterisk: 1085 T_ASTERISK { 1086 $$ = xcalloc(1, sizeof(*$$)); 1087 $$->p_pointer = true; 1088 } 1089 ; 1090 1091 type_qualifier_list_opt: 1092 /* empty */ { 1093 $$ = NULL; 1094 } 1095 | type_qualifier_list 1096 ; 1097 1098 type_qualifier_list: /* C99 6.7.5 */ 1099 type_qualifier 1100 | type_qualifier_list type_qualifier { 1101 $$ = merge_qualified_pointer($1, $2); 1102 } 1103 ; 1104 1105 type_qualifier: 1106 T_QUAL { 1107 $$ = xcalloc(1, sizeof(*$$)); 1108 if ($1 == CONST) { 1109 $$->p_const = true; 1110 } else if ($1 == VOLATILE) { 1111 $$->p_volatile = true; 1112 } else { 1113 lint_assert($1 == RESTRICT || $1 == THREAD); 1114 } 1115 } 1116 ; 1117 1118 align_as: /* See alignment-specifier in C11 6.7.5 */ 1119 typespec 1120 | constant_expr 1121 ; 1122 1123 param_list: 1124 id_list_lparen identifier_list T_RPAREN { 1125 $$ = $2; 1126 } 1127 | abstract_decl_param_list 1128 ; 1129 1130 id_list_lparen: 1131 T_LPAREN { 1132 block_level++; 1133 begin_declaration_level(PROTO_ARG); 1134 } 1135 ; 1136 1137 identifier_list: 1138 T_NAME { 1139 $$ = old_style_function_name(getsym($1)); 1140 } 1141 | identifier_list T_COMMA T_NAME { 1142 $$ = lnklst($1, old_style_function_name(getsym($3))); 1143 } 1144 | identifier_list error 1145 ; 1146 1147 abstract_decl_param_list: 1148 abstract_decl_lparen T_RPAREN type_attribute_opt { 1149 $$ = NULL; 1150 } 1151 | abstract_decl_lparen vararg_parameter_type_list T_RPAREN type_attribute_opt { 1152 dcs->d_proto = true; 1153 $$ = $2; 1154 } 1155 | abstract_decl_lparen error T_RPAREN type_attribute_opt { 1156 $$ = NULL; 1157 } 1158 ; 1159 1160 abstract_decl_lparen: 1161 T_LPAREN { 1162 block_level++; 1163 begin_declaration_level(PROTO_ARG); 1164 } 1165 ; 1166 1167 vararg_parameter_type_list: 1168 parameter_type_list 1169 | parameter_type_list T_COMMA T_ELLIPSIS { 1170 dcs->d_vararg = true; 1171 $$ = $1; 1172 } 1173 | T_ELLIPSIS { 1174 if (sflag) { 1175 /* ANSI C requires formal parameter before '...' */ 1176 error(84); 1177 } else if (!tflag) { 1178 /* ANSI C requires formal parameter before '...' */ 1179 warning(84); 1180 } 1181 dcs->d_vararg = true; 1182 $$ = NULL; 1183 } 1184 ; 1185 1186 parameter_type_list: 1187 parameter_declaration 1188 | parameter_type_list T_COMMA parameter_declaration { 1189 $$ = lnklst($1, $3); 1190 } 1191 ; 1192 1193 /* XXX: C99 6.7.5 defines the same name, but it looks completely different. */ 1194 parameter_declaration: 1195 declmods deftyp { 1196 $$ = declare_argument(abstract_name(), false); 1197 } 1198 | declaration_specifiers deftyp { 1199 $$ = declare_argument(abstract_name(), false); 1200 } 1201 | declmods deftyp notype_param_decl { 1202 $$ = declare_argument($3, false); 1203 } 1204 | declaration_specifiers deftyp type_param_decl { 1205 $$ = declare_argument($3, false); 1206 } 1207 | declmods deftyp abstract_declarator { 1208 $$ = declare_argument($3, false); 1209 } 1210 | declaration_specifiers deftyp abstract_declarator { 1211 $$ = declare_argument($3, false); 1212 } 1213 ; 1214 1215 asm_or_symbolrename_opt: /* expect only one */ 1216 /* empty */ { 1217 $$ = NULL; 1218 } 1219 | T_ASM T_LPAREN T_STRING T_RPAREN { 1220 freeyyv(&$3, T_STRING); 1221 $$ = NULL; 1222 } 1223 | T_SYMBOLRENAME T_LPAREN T_NAME T_RPAREN { 1224 $$ = $3; 1225 } 1226 ; 1227 1228 initializer: /* C99 6.7.8 "Initialization" */ 1229 expr %prec T_COMMA { 1230 init_expr($1); 1231 } 1232 | init_lbrace init_rbrace { 1233 /* XXX: Empty braces are not covered by C99 6.7.8. */ 1234 } 1235 | init_lbrace initializer_list comma_opt init_rbrace 1236 | error 1237 ; 1238 1239 initializer_list: /* C99 6.7.8 "Initialization" */ 1240 initializer_list_item 1241 | initializer_list T_COMMA initializer_list_item 1242 ; 1243 1244 initializer_list_item: 1245 designation initializer 1246 | initializer 1247 ; 1248 1249 designation: /* C99 6.7.8 "Initialization" */ 1250 designator_list T_ASSIGN 1251 | identifier T_COLON { 1252 /* GCC style struct or union member name in initializer */ 1253 gnuism(315); 1254 add_designator_member($1); 1255 } 1256 ; 1257 1258 designator_list: /* C99 6.7.8 "Initialization" */ 1259 designator 1260 | designator_list designator 1261 ; 1262 1263 designator: /* C99 6.7.8 "Initialization" */ 1264 T_LBRACK range T_RBRACK { 1265 add_designator_subscript($2); 1266 if (!Sflag) 1267 /* array initializer with des.s is a C9X feature */ 1268 warning(321); 1269 } 1270 | T_POINT identifier { 1271 if (!Sflag) 1272 /* struct or union member name in initializer is ... */ 1273 warning(313); 1274 add_designator_member($2); 1275 } 1276 ; 1277 1278 range: 1279 constant_expr { 1280 $$.lo = to_int_constant($1, true); 1281 $$.hi = $$.lo; 1282 } 1283 | constant_expr T_ELLIPSIS constant_expr { 1284 $$.lo = to_int_constant($1, true); 1285 $$.hi = to_int_constant($3, true); 1286 /* initialization with '[a...b]' is a GCC extension */ 1287 gnuism(340); 1288 } 1289 ; 1290 1291 init_lbrace: 1292 T_LBRACE { 1293 init_lbrace(); 1294 } 1295 ; 1296 1297 init_rbrace: 1298 T_RBRACE { 1299 init_rbrace(); 1300 } 1301 ; 1302 1303 type_name: /* C99 6.7.6 */ 1304 { 1305 begin_declaration_level(ABSTRACT); 1306 } abstract_declaration { 1307 end_declaration_level(); 1308 $$ = $2->s_type; 1309 } 1310 ; 1311 1312 abstract_declaration: 1313 noclass_declmods deftyp { 1314 $$ = declare_1_abstract(abstract_name()); 1315 } 1316 | noclass_declspecs deftyp { 1317 $$ = declare_1_abstract(abstract_name()); 1318 } 1319 | noclass_declmods deftyp abstract_declarator { 1320 $$ = declare_1_abstract($3); 1321 } 1322 | noclass_declspecs deftyp abstract_declarator { 1323 $$ = declare_1_abstract($3); 1324 } 1325 ; 1326 1327 abstract_declarator: /* C99 6.7.6 */ 1328 pointer { 1329 $$ = add_pointer(abstract_name(), $1); 1330 } 1331 | direct_abstract_declarator 1332 | pointer direct_abstract_declarator { 1333 $$ = add_pointer($2, $1); 1334 } 1335 | T_TYPEOF term { /* GCC extension */ 1336 $$ = mktempsym($2->tn_type); 1337 } 1338 ; 1339 1340 /* 1341 * XXX: shift/reduce conflict, caused by: 1342 * type_attribute direct_abstract_declarator 1343 * direct_abstract_declarator type_attribute 1344 */ 1345 direct_abstract_declarator: /* C99 6.7.6 */ 1346 T_LPAREN abstract_declarator T_RPAREN { 1347 $$ = $2; 1348 } 1349 | T_LBRACK T_RBRACK { 1350 $$ = add_array(abstract_name(), false, 0); 1351 } 1352 | T_LBRACK array_size T_RBRACK { 1353 $$ = add_array(abstract_name(), true, to_int_constant($2, false)); 1354 } 1355 | type_attribute direct_abstract_declarator { 1356 $$ = $2; 1357 } 1358 | direct_abstract_declarator T_LBRACK T_RBRACK { 1359 $$ = add_array($1, false, 0); 1360 } 1361 | direct_abstract_declarator T_LBRACK T_ASTERISK T_RBRACK { /* C99 */ 1362 $$ = add_array($1, false, 0); 1363 } 1364 | direct_abstract_declarator T_LBRACK array_size T_RBRACK { 1365 $$ = add_array($1, true, to_int_constant($3, false)); 1366 } 1367 | abstract_decl_param_list asm_or_symbolrename_opt { 1368 $$ = add_function(symbolrename(abstract_name(), $2), $1); 1369 end_declaration_level(); 1370 block_level--; 1371 } 1372 | direct_abstract_declarator abstract_decl_param_list asm_or_symbolrename_opt { 1373 $$ = add_function(symbolrename($1, $3), $2); 1374 end_declaration_level(); 1375 block_level--; 1376 } 1377 | direct_abstract_declarator type_attribute 1378 ; 1379 1380 array_size: 1381 type_qualifier_list_opt T_SCLASS constant_expr { 1382 /* C11 6.7.6.3p7 */ 1383 if ($2 != STATIC) 1384 yyerror("Bad attribute"); 1385 /* static array size is a C11 extension */ 1386 c11ism(343); 1387 $$ = $3; 1388 } 1389 | constant_expr 1390 ; 1391 1392 non_expr_statement: 1393 type_attribute T_SEMI 1394 | labeled_statement 1395 | compound_statement 1396 | selection_statement 1397 | iteration_statement 1398 | jump_statement { 1399 seen_fallthrough = false; 1400 } 1401 | asm_statement 1402 ; 1403 1404 statement: /* C99 6.8 */ 1405 expression_statement 1406 | non_expr_statement 1407 ; 1408 1409 labeled_statement: /* C99 6.8.1 */ 1410 label gcc_attribute_list_opt statement 1411 ; 1412 1413 label: 1414 T_NAME T_COLON { 1415 symtyp = FLABEL; 1416 named_label(getsym($1)); 1417 } 1418 | T_CASE constant_expr T_COLON { 1419 case_label($2); 1420 seen_fallthrough = true; 1421 } 1422 | T_CASE constant_expr T_ELLIPSIS constant_expr T_COLON { 1423 /* XXX: We don't fill all cases */ 1424 case_label($2); 1425 seen_fallthrough = true; 1426 } 1427 | T_DEFAULT T_COLON { 1428 default_label(); 1429 seen_fallthrough = true; 1430 } 1431 ; 1432 1433 compound_statement: /* C99 6.8.2 */ 1434 compound_statement_lbrace block_item_list_opt 1435 compound_statement_rbrace 1436 ; 1437 1438 compound_statement_lbrace: 1439 T_LBRACE { 1440 block_level++; 1441 mem_block_level++; 1442 begin_declaration_level(AUTO); 1443 } 1444 ; 1445 1446 compound_statement_rbrace: 1447 T_RBRACE { 1448 end_declaration_level(); 1449 freeblk(); 1450 mem_block_level--; 1451 block_level--; 1452 seen_fallthrough = false; 1453 } 1454 ; 1455 1456 block_item_list_opt: /* C99 6.8.2 */ 1457 /* empty */ 1458 | block_item_list 1459 ; 1460 1461 block_item_list: 1462 block_item 1463 | block_item_list block_item { 1464 if (!Sflag && $1 && !$2) 1465 /* declarations after statements is a C99 feature */ 1466 c99ism(327); 1467 $$ = $1 || $2; 1468 } 1469 ; 1470 1471 block_item: 1472 statement { 1473 $$ = true; 1474 restore_warning_flags(); 1475 } 1476 | declaration { 1477 $$ = false; 1478 restore_warning_flags(); 1479 } 1480 ; 1481 1482 expression_statement: /* C99 6.8.3 */ 1483 expr T_SEMI { 1484 expr($1, false, false, false, false); 1485 seen_fallthrough = false; 1486 } 1487 | T_SEMI { 1488 seen_fallthrough = false; 1489 } 1490 ; 1491 1492 selection_statement: /* C99 6.8.4 */ 1493 if_without_else { 1494 save_warning_flags(); 1495 if2(); 1496 if3(false); 1497 } 1498 | if_without_else T_ELSE { 1499 save_warning_flags(); 1500 if2(); 1501 } statement { 1502 clear_warning_flags(); 1503 if3(true); 1504 } 1505 | if_without_else T_ELSE error { 1506 clear_warning_flags(); 1507 if3(false); 1508 } 1509 | switch_expr statement { 1510 clear_warning_flags(); 1511 switch2(); 1512 } 1513 | switch_expr error { 1514 clear_warning_flags(); 1515 switch2(); 1516 } 1517 ; 1518 1519 if_without_else: /* see C99 6.8.4 */ 1520 if_expr statement 1521 | if_expr error 1522 ; 1523 1524 if_expr: /* see C99 6.8.4 */ 1525 T_IF T_LPAREN expr T_RPAREN { 1526 if1($3); 1527 clear_warning_flags(); 1528 } 1529 ; 1530 1531 switch_expr: /* see C99 6.8.4 */ 1532 T_SWITCH T_LPAREN expr T_RPAREN { 1533 switch1($3); 1534 clear_warning_flags(); 1535 } 1536 ; 1537 1538 do_statement: /* C99 6.8.5 */ 1539 do statement { 1540 clear_warning_flags(); 1541 } 1542 ; 1543 1544 iteration_statement: /* C99 6.8.5 */ 1545 while_expr statement { 1546 clear_warning_flags(); 1547 while2(); 1548 } 1549 | while_expr error { 1550 clear_warning_flags(); 1551 while2(); 1552 } 1553 | do_statement do_while_expr { 1554 do2($2); 1555 seen_fallthrough = false; 1556 } 1557 | do error { 1558 clear_warning_flags(); 1559 do2(NULL); 1560 } 1561 | for_exprs statement { 1562 clear_warning_flags(); 1563 for2(); 1564 end_declaration_level(); 1565 block_level--; 1566 } 1567 | for_exprs error { 1568 clear_warning_flags(); 1569 for2(); 1570 end_declaration_level(); 1571 block_level--; 1572 } 1573 ; 1574 1575 while_expr: /* see C99 6.8.5 */ 1576 T_WHILE T_LPAREN expr T_RPAREN { 1577 while1($3); 1578 clear_warning_flags(); 1579 } 1580 ; 1581 1582 do: /* see C99 6.8.5 */ 1583 T_DO { 1584 do1(); 1585 } 1586 ; 1587 1588 do_while_expr: /* see C99 6.8.5 */ 1589 T_WHILE T_LPAREN expr T_RPAREN T_SEMI { 1590 $$ = $3; 1591 } 1592 ; 1593 1594 for_start: /* see C99 6.8.5 */ 1595 T_FOR T_LPAREN { 1596 begin_declaration_level(AUTO); 1597 block_level++; 1598 } 1599 ; 1600 1601 for_exprs: /* see C99 6.8.5 */ 1602 for_start declaration_specifiers deftyp notype_init_decls T_SEMI 1603 expr_opt T_SEMI expr_opt T_RPAREN { 1604 /* variable declaration in for loop */ 1605 c99ism(325); 1606 for1(NULL, $6, $8); 1607 clear_warning_flags(); 1608 } 1609 | for_start expr_opt T_SEMI expr_opt T_SEMI expr_opt T_RPAREN { 1610 for1($2, $4, $6); 1611 clear_warning_flags(); 1612 } 1613 ; 1614 1615 jump_statement: /* C99 6.8.6 */ 1616 goto identifier T_SEMI { 1617 do_goto(getsym($2)); 1618 } 1619 | goto error T_SEMI { 1620 symtyp = FVFT; 1621 } 1622 | T_CONTINUE T_SEMI { 1623 do_continue(); 1624 } 1625 | T_BREAK T_SEMI { 1626 do_break(); 1627 } 1628 | T_RETURN T_SEMI { 1629 do_return(NULL); 1630 } 1631 | T_RETURN expr T_SEMI { 1632 do_return($2); 1633 } 1634 ; 1635 1636 goto: 1637 T_GOTO { 1638 symtyp = FLABEL; 1639 } 1640 ; 1641 1642 asm_statement: 1643 T_ASM T_LPAREN read_until_rparen T_SEMI { 1644 setasm(); 1645 } 1646 | T_ASM T_QUAL T_LPAREN read_until_rparen T_SEMI { 1647 setasm(); 1648 } 1649 | T_ASM error 1650 ; 1651 1652 read_until_rparen: 1653 /* empty */ { 1654 ignore_up_to_rparen(); 1655 } 1656 ; 1657 1658 constant_expr_list_opt: 1659 /* empty */ 1660 | constant_expr_list 1661 ; 1662 1663 constant_expr_list: 1664 constant_expr 1665 | constant_expr_list T_COMMA constant_expr 1666 ; 1667 1668 constant_expr: /* C99 6.6 */ 1669 expr %prec T_ASSIGN 1670 ; 1671 1672 expr_opt: 1673 /* empty */ { 1674 $$ = NULL; 1675 } 1676 | expr 1677 ; 1678 1679 expr: /* C99 6.5 */ 1680 expr T_ASTERISK expr { 1681 $$ = build(MULT, $1, $3); 1682 } 1683 | expr T_MULTIPLICATIVE expr { 1684 $$ = build($2, $1, $3); 1685 } 1686 | expr T_ADDITIVE expr { 1687 $$ = build($2, $1, $3); 1688 } 1689 | expr T_SHIFT expr { 1690 $$ = build($2, $1, $3); 1691 } 1692 | expr T_RELATIONAL expr { 1693 $$ = build($2, $1, $3); 1694 } 1695 | expr T_EQUALITY expr { 1696 $$ = build($2, $1, $3); 1697 } 1698 | expr T_AMPER expr { 1699 $$ = build(BITAND, $1, $3); 1700 } 1701 | expr T_BITXOR expr { 1702 $$ = build(BITXOR, $1, $3); 1703 } 1704 | expr T_BITOR expr { 1705 $$ = build(BITOR, $1, $3); 1706 } 1707 | expr T_LOGAND expr { 1708 $$ = build(LOGAND, $1, $3); 1709 } 1710 | expr T_LOGOR expr { 1711 $$ = build(LOGOR, $1, $3); 1712 } 1713 | expr T_QUEST expr T_COLON expr { 1714 $$ = build(QUEST, $1, build(COLON, $3, $5)); 1715 } 1716 | expr T_ASSIGN expr { 1717 $$ = build(ASSIGN, $1, $3); 1718 } 1719 | expr T_OPASSIGN expr { 1720 $$ = build($2, $1, $3); 1721 } 1722 | expr T_COMMA expr { 1723 $$ = build(COMMA, $1, $3); 1724 } 1725 | term 1726 | generic_selection 1727 ; 1728 1729 assignment_expression: /* C99 6.5.16 */ 1730 expr %prec T_ASSIGN 1731 ; 1732 1733 term: /* see C99 6.5.1 */ 1734 T_NAME { 1735 /* XXX really necessary? */ 1736 if (yychar < 0) 1737 yychar = yylex(); 1738 $$ = new_name_node(getsym($1), yychar); 1739 } 1740 | string { 1741 $$ = new_string_node($1); 1742 } 1743 | T_CON { 1744 $$ = expr_new_constant(gettyp($1->v_tspec), $1); 1745 } 1746 | T_LPAREN expr T_RPAREN { 1747 if ($2 != NULL) 1748 $2->tn_parenthesized = true; 1749 $$ = $2; 1750 } 1751 | T_LPAREN compound_statement_lbrace gcc_statement_expr_list { 1752 block_level--; 1753 mem_block_level--; 1754 begin_initialization(mktempsym(dup_type($3->tn_type))); 1755 mem_block_level++; 1756 block_level++; 1757 /* ({ }) is a GCC extension */ 1758 gnuism(320); 1759 } compound_statement_rbrace T_RPAREN { 1760 $$ = new_name_node(*current_initsym(), 0); 1761 end_initialization(); 1762 } 1763 | term T_INCDEC { 1764 $$ = build($2 == INC ? INCAFT : DECAFT, $1, NULL); 1765 } 1766 | T_INCDEC term { 1767 $$ = build($1 == INC ? INCBEF : DECBEF, $2, NULL); 1768 } 1769 | T_ASTERISK term { 1770 $$ = build(INDIR, $2, NULL); 1771 } 1772 | T_AMPER term { 1773 $$ = build(ADDR, $2, NULL); 1774 } 1775 | T_UNARY term { 1776 $$ = build($1, $2, NULL); 1777 } 1778 | T_ADDITIVE term { 1779 if (tflag && $1 == PLUS) { 1780 /* unary + is illegal in traditional C */ 1781 warning(100); 1782 } 1783 $$ = build($1 == PLUS ? UPLUS : UMINUS, $2, NULL); 1784 } 1785 | term T_LBRACK expr T_RBRACK { 1786 $$ = build(INDIR, build(PLUS, $1, $3), NULL); 1787 } 1788 | term T_LPAREN T_RPAREN { 1789 $$ = new_function_call_node($1, NULL); 1790 } 1791 | term T_LPAREN func_arg_list T_RPAREN { 1792 $$ = new_function_call_node($1, $3); 1793 } 1794 | term point_or_arrow T_NAME { 1795 if ($1 != NULL) { 1796 sym_t *msym; 1797 /* 1798 * XXX struct_or_union_member should be integrated 1799 * in build() 1800 */ 1801 if ($2 == ARROW) { 1802 /* 1803 * must do this before struct_or_union_member 1804 * is called 1805 */ 1806 $1 = cconv($1); 1807 } 1808 msym = struct_or_union_member($1, $2, getsym($3)); 1809 $$ = build($2, $1, new_name_node(msym, 0)); 1810 } else { 1811 $$ = NULL; 1812 } 1813 } 1814 | T_REAL term { 1815 $$ = build(REAL, $2, NULL); 1816 } 1817 | T_IMAG term { 1818 $$ = build(IMAG, $2, NULL); 1819 } 1820 | T_EXTENSION term { 1821 $$ = $2; 1822 } 1823 | T_BUILTIN_OFFSETOF T_LPAREN type_name T_COMMA identifier T_RPAREN { 1824 symtyp = FMEMBER; 1825 $$ = build_offsetof($3, getsym($5)); 1826 } 1827 | T_SIZEOF term { 1828 $$ = $2 == NULL ? NULL : build_sizeof($2->tn_type); 1829 if ($$ != NULL) 1830 check_expr_misc($2, false, false, false, false, false, true); 1831 } 1832 | T_SIZEOF T_LPAREN type_name T_RPAREN %prec T_SIZEOF { 1833 $$ = build_sizeof($3); 1834 } 1835 | T_ALIGNOF T_LPAREN type_name T_RPAREN { 1836 $$ = build_alignof($3); 1837 } 1838 | T_LPAREN type_name T_RPAREN term %prec T_UNARY { 1839 $$ = cast($4, $2); 1840 } 1841 | T_LPAREN type_name T_RPAREN { /* C99 6.5.2.5 "Compound literals" */ 1842 sym_t *tmp = mktempsym($2); 1843 begin_initialization(tmp); 1844 cgram_declare(tmp, true, NULL); 1845 } init_lbrace initializer_list comma_opt init_rbrace { 1846 if (!Sflag) 1847 /* compound literals are a C9X/GCC extension */ 1848 gnuism(319); 1849 $$ = new_name_node(*current_initsym(), 0); 1850 end_initialization(); 1851 } 1852 ; 1853 1854 generic_selection: /* C11 6.5.1.1 */ 1855 T_GENERIC T_LPAREN assignment_expression T_COMMA 1856 generic_assoc_list T_RPAREN { 1857 /* generic selection requires C11 or later */ 1858 c11ism(345); 1859 $$ = build_generic_selection($3, $5); 1860 } 1861 ; 1862 1863 generic_assoc_list: /* C11 6.5.1.1 */ 1864 generic_association 1865 | generic_assoc_list T_COMMA generic_association { 1866 $3->ga_prev = $1; 1867 $$ = $3; 1868 } 1869 ; 1870 1871 generic_association: /* C11 6.5.1.1 */ 1872 type_name T_COLON assignment_expression { 1873 $$ = getblk(sizeof(*$$)); 1874 $$->ga_arg = $1; 1875 $$->ga_result = $3; 1876 } 1877 | T_DEFAULT T_COLON assignment_expression { 1878 $$ = getblk(sizeof(*$$)); 1879 $$->ga_arg = NULL; 1880 $$->ga_result = $3; 1881 } 1882 ; 1883 1884 /* 1885 * The inner part of a GCC statement-expression of the form ({ ... }). 1886 * 1887 * https://gcc.gnu.org/onlinedocs/gcc/Statement-Exprs.html 1888 */ 1889 gcc_statement_expr_list: 1890 gcc_statement_expr_item 1891 | gcc_statement_expr_list gcc_statement_expr_item { 1892 $$ = $2; 1893 } 1894 ; 1895 1896 gcc_statement_expr_item: 1897 declaration { 1898 clear_warning_flags(); 1899 $$ = NULL; 1900 } 1901 | non_expr_statement { 1902 $$ = expr_zalloc_tnode(); 1903 $$->tn_type = gettyp(VOID); 1904 } 1905 | expr T_SEMI { 1906 if ($1 == NULL) { /* in case of syntax errors */ 1907 $$ = expr_zalloc_tnode(); 1908 $$->tn_type = gettyp(VOID); 1909 } else { 1910 /* XXX: do that only on the last name */ 1911 if ($1->tn_op == NAME) 1912 $1->tn_sym->s_used = true; 1913 $$ = $1; 1914 expr($1, false, false, false, false); 1915 seen_fallthrough = false; 1916 } 1917 } 1918 ; 1919 1920 string: 1921 T_STRING 1922 | T_STRING string2 { 1923 $$ = cat_strings($1, $2); 1924 } 1925 ; 1926 1927 string2: 1928 T_STRING { 1929 if (tflag) { 1930 /* concatenated strings are illegal in traditional C */ 1931 warning(219); 1932 } 1933 $$ = $1; 1934 } 1935 | string2 T_STRING { 1936 $$ = cat_strings($1, $2); 1937 } 1938 ; 1939 1940 func_arg_list: 1941 expr %prec T_COMMA { 1942 $$ = new_function_argument_node(NULL, $1); 1943 } 1944 | func_arg_list T_COMMA expr { 1945 $$ = new_function_argument_node($1, $3); 1946 } 1947 ; 1948 1949 point_or_arrow: 1950 T_POINT { 1951 symtyp = FMEMBER; 1952 $$ = POINT; 1953 } 1954 | T_ARROW { 1955 symtyp = FMEMBER; 1956 $$ = ARROW; 1957 } 1958 ; 1959 1960 identifier: /* C99 6.4.2.1 */ 1961 T_NAME { 1962 $$ = $1; 1963 cgram_debug("name '%s'", $$->sb_name); 1964 } 1965 | T_TYPENAME { 1966 $$ = $1; 1967 cgram_debug("typename '%s'", $$->sb_name); 1968 } 1969 ; 1970 1971 comma_opt: 1972 /* empty */ 1973 | T_COMMA 1974 ; 1975 1976 /* GCC extensions */ 1977 1978 type_attribute_list_opt: 1979 /* empty */ 1980 | type_attribute_list 1981 ; 1982 1983 type_attribute_list: 1984 type_attribute 1985 | type_attribute_list type_attribute 1986 ; 1987 1988 type_attribute_opt: 1989 /* empty */ 1990 | type_attribute 1991 ; 1992 1993 type_attribute: 1994 gcc_attribute 1995 | T_ALIGNAS T_LPAREN align_as T_RPAREN 1996 | T_PACKED { 1997 addpacked(); 1998 } 1999 | T_NORETURN 2000 ; 2001 2002 gcc_attribute_list_opt: 2003 /* empty */ 2004 | gcc_attribute_list 2005 ; 2006 2007 gcc_attribute_list: 2008 gcc_attribute 2009 | gcc_attribute_list gcc_attribute 2010 ; 2011 2012 /* https://gcc.gnu.org/onlinedocs/gcc/Attribute-Syntax.html */ 2013 gcc_attribute: 2014 T_ATTRIBUTE T_LPAREN T_LPAREN { 2015 attron = true; 2016 } gcc_attribute_spec_list { 2017 attron = false; 2018 } T_RPAREN T_RPAREN 2019 ; 2020 2021 gcc_attribute_spec_list: 2022 gcc_attribute_spec 2023 | gcc_attribute_spec_list T_COMMA gcc_attribute_spec 2024 ; 2025 2026 gcc_attribute_spec: 2027 /* empty */ 2028 | T_AT_ALWAYS_INLINE 2029 | T_AT_ALIAS T_LPAREN string T_RPAREN 2030 | T_AT_ALIGNED T_LPAREN constant_expr T_RPAREN 2031 | T_AT_ALIGNED 2032 | T_AT_ALLOC_SIZE T_LPAREN constant_expr T_COMMA constant_expr T_RPAREN 2033 | T_AT_ALLOC_SIZE T_LPAREN constant_expr T_RPAREN 2034 | T_AT_BOUNDED T_LPAREN gcc_attribute_bounded 2035 T_COMMA constant_expr T_COMMA constant_expr T_RPAREN 2036 | T_AT_COLD 2037 | T_AT_COMMON 2038 | T_AT_CONSTRUCTOR T_LPAREN constant_expr T_RPAREN 2039 | T_AT_CONSTRUCTOR 2040 | T_AT_DEPRECATED T_LPAREN string T_RPAREN 2041 | T_AT_DEPRECATED 2042 | T_AT_DESTRUCTOR T_LPAREN constant_expr T_RPAREN 2043 | T_AT_DESTRUCTOR 2044 | T_AT_FALLTHROUGH { 2045 fallthru(1); 2046 } 2047 | T_AT_FORMAT T_LPAREN gcc_attribute_format T_COMMA 2048 constant_expr T_COMMA constant_expr T_RPAREN 2049 | T_AT_FORMAT_ARG T_LPAREN constant_expr T_RPAREN 2050 | T_AT_GNU_INLINE 2051 | T_AT_MALLOC 2052 | T_AT_MAY_ALIAS 2053 | T_AT_MODE T_LPAREN T_NAME T_RPAREN 2054 | T_AT_NOINLINE 2055 | T_AT_NONNULL T_LPAREN constant_expr_list_opt T_RPAREN 2056 | T_AT_NONNULL 2057 | T_AT_NONSTRING 2058 | T_AT_NORETURN 2059 | T_AT_NOTHROW 2060 | T_AT_NO_INSTRUMENT_FUNCTION 2061 | T_AT_OPTIMIZE T_LPAREN string T_RPAREN 2062 | T_AT_PACKED { 2063 addpacked(); 2064 } 2065 | T_AT_PCS T_LPAREN string T_RPAREN 2066 | T_AT_PURE 2067 | T_AT_RETURNS_TWICE 2068 | T_AT_SECTION T_LPAREN string T_RPAREN 2069 | T_AT_SENTINEL T_LPAREN constant_expr T_RPAREN 2070 | T_AT_SENTINEL 2071 | T_AT_TLS_MODEL T_LPAREN string T_RPAREN 2072 | T_AT_TUNION 2073 | T_AT_UNUSED { 2074 add_attr_used(); 2075 } 2076 | T_AT_USED { 2077 add_attr_used(); 2078 } 2079 | T_AT_VISIBILITY T_LPAREN constant_expr T_RPAREN 2080 | T_AT_WARN_UNUSED_RESULT 2081 | T_AT_WEAK 2082 | T_QUAL { 2083 if ($1 != CONST) 2084 yyerror("Bad attribute"); 2085 } 2086 ; 2087 2088 gcc_attribute_bounded: 2089 T_AT_MINBYTES 2090 | T_AT_STRING 2091 | T_AT_BUFFER 2092 ; 2093 2094 gcc_attribute_format: 2095 T_AT_FORMAT_GNU_PRINTF 2096 | T_AT_FORMAT_PRINTF 2097 | T_AT_FORMAT_SCANF 2098 | T_AT_FORMAT_STRFMON 2099 | T_AT_FORMAT_STRFTIME 2100 | T_AT_FORMAT_SYSLOG 2101 ; 2102 2103 %% 2104 2105 /* ARGSUSED */ 2106 int 2107 yyerror(const char *msg) 2108 { 2109 /* syntax error '%s' */ 2110 error(249, yytext); 2111 if (++sytxerr >= 5) 2112 norecover(); 2113 return 0; 2114 } 2115 2116 static void 2117 cgram_declare(sym_t *decl, bool initflg, sbuf_t *renaming) 2118 { 2119 declare(decl, initflg, renaming); 2120 if (renaming != NULL) 2121 freeyyv(&renaming, T_NAME); 2122 } 2123 2124 /* 2125 * Discard all input tokens up to and including the next 2126 * unmatched right paren 2127 */ 2128 static void 2129 ignore_up_to_rparen(void) 2130 { 2131 int level; 2132 2133 if (yychar < 0) 2134 yychar = yylex(); 2135 freeyyv(&yylval, yychar); 2136 2137 level = 1; 2138 while (yychar != T_RPAREN || --level > 0) { 2139 if (yychar == T_LPAREN) { 2140 level++; 2141 } else if (yychar <= 0) { 2142 break; 2143 } 2144 freeyyv(&yylval, yychar = yylex()); 2145 } 2146 2147 yyclearin; 2148 } 2149 2150 static sym_t * 2151 symbolrename(sym_t *s, sbuf_t *sb) 2152 { 2153 if (sb != NULL) 2154 s->s_rename = sb->sb_name; 2155 return s; 2156 } 2157
Indexes created Fri Oct 03 02:09:57 GMT 2025