cgram.y revision 1.279
1 %{ 2 /* $NetBSD: cgram.y,v 1.279 2021/07/10 04:47:25 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 1.279 2021/07/10 04:47:25 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 150 127 128 %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 | declaration_noerror 407 | error T_SEMI { 408 global_clean_up(); 409 } 410 | error T_RBRACE { 411 global_clean_up(); 412 } 413 ; 414 415 function_definition: /* C99 6.9.1 */ 416 func_decl { 417 if ($1->s_type->t_tspec != FUNC) { 418 /* syntax error '%s' */ 419 error(249, yytext); 420 YYERROR; 421 } 422 if ($1->s_type->t_typedef) { 423 /* ()-less function definition */ 424 error(64); 425 YYERROR; 426 } 427 funcdef($1); 428 block_level++; 429 begin_declaration_level(ARG); 430 if (lwarn == LWARN_NONE) 431 $1->s_used = true; 432 } arg_declaration_list_opt { 433 end_declaration_level(); 434 block_level--; 435 check_func_lint_directives(); 436 check_func_old_style_arguments(); 437 begin_control_statement(CS_FUNCTION_BODY); 438 } compound_statement { 439 funcend(); 440 end_control_statement(CS_FUNCTION_BODY); 441 } 442 ; 443 444 func_decl: 445 clrtyp deftyp notype_decl { 446 $$ = $3; 447 } 448 | declmods deftyp notype_decl { 449 $$ = $3; 450 } 451 | declaration_specifiers deftyp type_decl { 452 $$ = $3; 453 } 454 ; 455 456 arg_declaration_list_opt: /* C99 6.9.1p13 example 1 */ 457 /* empty */ 458 | arg_declaration_list 459 ; 460 461 arg_declaration_list: /* C99 6.9.1p13 example 1 */ 462 arg_declaration 463 | arg_declaration_list arg_declaration 464 /* XXX or better "arg_declaration error" ? */ 465 | error 466 ; 467 468 /* 469 * "arg_declaration" is separated from "declaration" because it 470 * needs other error handling. 471 */ 472 arg_declaration: 473 declmods deftyp T_SEMI { 474 /* empty declaration */ 475 warning(2); 476 } 477 | declmods deftyp notype_init_decls T_SEMI 478 | declaration_specifiers deftyp T_SEMI { 479 if (!dcs->d_nonempty_decl) { 480 /* empty declaration */ 481 warning(2); 482 } else { 483 /* '%s' declared in argument declaration list */ 484 warning(3, type_name(dcs->d_type)); 485 } 486 } 487 | declaration_specifiers deftyp type_init_decls T_SEMI { 488 if (dcs->d_nonempty_decl) { 489 /* '%s' declared in argument declaration list */ 490 warning(3, type_name(dcs->d_type)); 491 } 492 } 493 | declmods error 494 | declaration_specifiers error 495 ; 496 497 declaration: /* C99 6.7 */ 498 declaration_noerror 499 | error T_SEMI 500 ; 501 502 declaration_noerror: /* see C99 6.7 'declaration' */ 503 declmods deftyp T_SEMI { 504 if (dcs->d_scl == TYPEDEF) { 505 /* typedef declares no type name */ 506 warning(72); 507 } else { 508 /* empty declaration */ 509 warning(2); 510 } 511 } 512 | declmods deftyp notype_init_decls T_SEMI 513 | declaration_specifiers deftyp T_SEMI { 514 if (dcs->d_scl == TYPEDEF) { 515 /* typedef declares no type name */ 516 warning(72); 517 } else if (!dcs->d_nonempty_decl) { 518 /* empty declaration */ 519 warning(2); 520 } 521 } 522 | declaration_specifiers deftyp type_init_decls T_SEMI 523 ; 524 525 clrtyp: 526 /* empty */ { 527 clrtyp(); 528 } 529 ; 530 531 deftyp: 532 /* empty */ { 533 deftyp(); 534 } 535 ; 536 537 declaration_specifiers: /* C99 6.7 */ 538 clrtyp_typespec { 539 add_type($1); 540 } 541 | declmods typespec { 542 add_type($2); 543 } 544 | type_attribute declaration_specifiers 545 | declaration_specifiers declmod 546 | declaration_specifiers notype_typespec { 547 add_type($2); 548 } 549 ; 550 551 declmods: 552 clrtyp qualifier_or_storage_class 553 | declmods declmod 554 ; 555 556 declmod: 557 qualifier_or_storage_class 558 | type_attribute 559 ; 560 561 qualifier_or_storage_class: 562 T_QUAL { 563 add_qualifier($1); 564 } 565 | T_SCLASS { 566 add_storage_class($1); 567 } 568 ; 569 570 clrtyp_typespec: 571 clrtyp notype_typespec { 572 $$ = $2; 573 } 574 | T_TYPENAME clrtyp { 575 $$ = getsym($1)->s_type; 576 } 577 ; 578 579 typespec: 580 notype_typespec 581 | T_TYPENAME { 582 $$ = getsym($1)->s_type; 583 } 584 ; 585 586 notype_typespec: 587 T_TYPE { 588 $$ = gettyp($1); 589 } 590 | T_TYPEOF term { 591 $$ = $2->tn_type; 592 } 593 | struct_spec { 594 end_declaration_level(); 595 $$ = $1; 596 } 597 | enum_spec { 598 end_declaration_level(); 599 $$ = $1; 600 } 601 ; 602 603 struct_spec: 604 struct struct_tag { 605 /* 606 * STDC requires that "struct a;" always introduces 607 * a new tag if "a" is not declared at current level 608 * 609 * yychar is valid because otherwise the parser would not 610 * have been able to decide if it must shift or reduce 611 */ 612 $$ = mktag($2, $1, false, yychar == T_SEMI); 613 } 614 | struct struct_tag { 615 dcs->d_tagtyp = mktag($2, $1, true, false); 616 } struct_declaration { 617 $$ = complete_tag_struct_or_union(dcs->d_tagtyp, $4); 618 } 619 | struct { 620 dcs->d_tagtyp = mktag(NULL, $1, true, false); 621 } struct_declaration { 622 $$ = complete_tag_struct_or_union(dcs->d_tagtyp, $3); 623 } 624 | struct error { 625 symtyp = FVFT; 626 $$ = gettyp(INT); 627 } 628 ; 629 630 struct: 631 T_STRUCT_OR_UNION { 632 symtyp = FTAG; 633 begin_declaration_level($1 == STRUCT ? MOS : MOU); 634 dcs->d_offset = 0; 635 dcs->d_sou_align_in_bits = CHAR_SIZE; 636 } type_attribute_list_opt 637 ; 638 639 struct_tag: 640 identifier { 641 $$ = getsym($1); 642 } 643 ; 644 645 struct_declaration: 646 T_LBRACE { 647 symtyp = FVFT; 648 } member_declaration_list_semi T_RBRACE { 649 $$ = $3; 650 } 651 ; 652 653 member_declaration_list_semi: 654 /* empty */ { 655 $$ = NULL; 656 } 657 | member_declaration_list T_SEMI 658 | member_declaration_list { 659 if (sflag) { 660 /* syntax req. ';' after last struct/union member */ 661 error(66); 662 } else { 663 /* syntax req. ';' after last struct/union member */ 664 warning(66); 665 } 666 $$ = $1; 667 } 668 ; 669 670 member_declaration_list: 671 member_declaration 672 | member_declaration_list T_SEMI member_declaration { 673 $$ = lnklst($1, $3); 674 } 675 ; 676 677 member_declaration: 678 noclass_declmods deftyp { 679 /* too late, i know, but getsym() compensates it */ 680 symtyp = FMEMBER; 681 } notype_member_decls type_attribute_opt { 682 symtyp = FVFT; 683 $$ = $4; 684 } 685 | noclass_declspecs deftyp { 686 symtyp = FMEMBER; 687 } type_member_decls type_attribute_opt { 688 symtyp = FVFT; 689 $$ = $4; 690 } 691 | noclass_declmods deftyp type_attribute_opt { 692 symtyp = FVFT; 693 /* struct or union member must be named */ 694 if (!Sflag) 695 /* anonymous struct/union members is a C9X feature */ 696 warning(49); 697 /* add all the members of the anonymous struct/union */ 698 lint_assert(is_struct_or_union(dcs->d_type->t_tspec)); 699 $$ = dcs->d_type->t_str->sou_first_member; 700 anonymize($$); 701 } 702 | noclass_declspecs deftyp type_attribute_opt { 703 symtyp = FVFT; 704 /* struct or union member must be named */ 705 if (!Sflag) 706 /* anonymous struct/union members is a C9X feature */ 707 warning(49); 708 if (is_struct_or_union(dcs->d_type->t_tspec)) { 709 $$ = dcs->d_type->t_str->sou_first_member; 710 /* add all the members of the anonymous struct/union */ 711 anonymize($$); 712 } else { 713 /* syntax error '%s' */ 714 error(249, "unnamed member"); 715 $$ = NULL; 716 } 717 } 718 | error { 719 symtyp = FVFT; 720 $$ = NULL; 721 } 722 ; 723 724 /* 725 * XXX: shift/reduce conflict, caused by: 726 * type_attribute noclass_declspecs 727 * noclass_declspecs type_attribute 728 */ 729 noclass_declspecs: 730 clrtyp_typespec { 731 add_type($1); 732 } 733 | type_attribute noclass_declspecs 734 | noclass_declmods typespec { 735 add_type($2); 736 } 737 | noclass_declspecs T_QUAL { 738 add_qualifier($2); 739 } 740 | noclass_declspecs notype_typespec { 741 add_type($2); 742 } 743 | noclass_declspecs type_attribute 744 ; 745 746 noclass_declmods: 747 clrtyp T_QUAL { 748 add_qualifier($2); 749 } 750 | noclass_declmods T_QUAL { 751 add_qualifier($2); 752 } 753 ; 754 755 notype_member_decls: 756 notype_member_decl { 757 $$ = 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 /* 1315 * XXX: shift/reduce conflict, caused by: 1316 * type_attribute direct_abstract_declarator 1317 * direct_abstract_declarator type_attribute 1318 */ 1319 direct_abstract_declarator: /* C99 6.7.6 */ 1320 T_LPAREN abstract_declarator T_RPAREN { 1321 $$ = $2; 1322 } 1323 | T_LBRACK T_RBRACK { 1324 $$ = add_array(abstract_name(), false, 0); 1325 } 1326 | T_LBRACK array_size T_RBRACK { 1327 $$ = add_array(abstract_name(), true, to_int_constant($2, false)); 1328 } 1329 | type_attribute direct_abstract_declarator { 1330 $$ = $2; 1331 } 1332 | direct_abstract_declarator T_LBRACK T_RBRACK { 1333 $$ = add_array($1, false, 0); 1334 } 1335 | direct_abstract_declarator T_LBRACK T_ASTERISK T_RBRACK { /* C99 */ 1336 $$ = add_array($1, false, 0); 1337 } 1338 | direct_abstract_declarator 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 abstract_decl_param_list asm_or_symbolrename_opt { 1347 $$ = add_function(symbolrename($1, $3), $2); 1348 end_declaration_level(); 1349 block_level--; 1350 } 1351 | direct_abstract_declarator type_attribute 1352 ; 1353 1354 array_size: 1355 type_qualifier_list_opt T_SCLASS constant_expr { 1356 /* C11 6.7.6.3p7 */ 1357 if ($2 != STATIC) 1358 yyerror("Bad attribute"); 1359 /* static array size is a C11 extension */ 1360 c11ism(343); 1361 $$ = $3; 1362 } 1363 | constant_expr 1364 ; 1365 1366 non_expr_statement: 1367 type_attribute T_SEMI 1368 | labeled_statement 1369 | compound_statement 1370 | selection_statement 1371 | iteration_statement 1372 | jump_statement { 1373 seen_fallthrough = false; 1374 } 1375 | asm_statement 1376 ; 1377 1378 statement: /* C99 6.8 */ 1379 expression_statement 1380 | non_expr_statement 1381 ; 1382 1383 labeled_statement: /* C99 6.8.1 */ 1384 label gcc_attribute_list_opt statement 1385 ; 1386 1387 label: 1388 T_NAME T_COLON { 1389 symtyp = FLABEL; 1390 named_label(getsym($1)); 1391 } 1392 | T_CASE constant_expr T_COLON { 1393 case_label($2); 1394 seen_fallthrough = true; 1395 } 1396 | T_CASE constant_expr T_ELLIPSIS constant_expr T_COLON { 1397 /* XXX: We don't fill all cases */ 1398 case_label($2); 1399 seen_fallthrough = true; 1400 } 1401 | T_DEFAULT T_COLON { 1402 default_label(); 1403 seen_fallthrough = true; 1404 } 1405 ; 1406 1407 compound_statement: /* C99 6.8.2 */ 1408 compound_statement_lbrace block_item_list_opt 1409 compound_statement_rbrace 1410 ; 1411 1412 compound_statement_lbrace: 1413 T_LBRACE { 1414 block_level++; 1415 mem_block_level++; 1416 begin_declaration_level(AUTO); 1417 } 1418 ; 1419 1420 compound_statement_rbrace: 1421 T_RBRACE { 1422 end_declaration_level(); 1423 freeblk(); 1424 mem_block_level--; 1425 block_level--; 1426 seen_fallthrough = false; 1427 } 1428 ; 1429 1430 block_item_list_opt: /* C99 6.8.2 */ 1431 /* empty */ 1432 | block_item_list 1433 ; 1434 1435 block_item_list: 1436 block_item 1437 | block_item_list block_item { 1438 if (!Sflag && $1 && !$2) 1439 /* declarations after statements is a C99 feature */ 1440 c99ism(327); 1441 $$ = $1 || $2; 1442 } 1443 ; 1444 1445 block_item: 1446 statement { 1447 $$ = true; 1448 restore_warning_flags(); 1449 } 1450 | declaration { 1451 $$ = false; 1452 restore_warning_flags(); 1453 } 1454 ; 1455 1456 expression_statement: /* C99 6.8.3 */ 1457 expr T_SEMI { 1458 expr($1, false, false, false, false); 1459 seen_fallthrough = false; 1460 } 1461 | T_SEMI { 1462 seen_fallthrough = false; 1463 } 1464 ; 1465 1466 selection_statement: /* C99 6.8.4 */ 1467 if_without_else { 1468 save_warning_flags(); 1469 if2(); 1470 if3(false); 1471 } 1472 | if_without_else T_ELSE { 1473 save_warning_flags(); 1474 if2(); 1475 } statement { 1476 clear_warning_flags(); 1477 if3(true); 1478 } 1479 | if_without_else T_ELSE error { 1480 clear_warning_flags(); 1481 if3(false); 1482 } 1483 | switch_expr statement { 1484 clear_warning_flags(); 1485 switch2(); 1486 } 1487 | switch_expr error { 1488 clear_warning_flags(); 1489 switch2(); 1490 } 1491 ; 1492 1493 if_without_else: /* see C99 6.8.4 */ 1494 if_expr statement 1495 | if_expr error 1496 ; 1497 1498 if_expr: /* see C99 6.8.4 */ 1499 T_IF T_LPAREN expr T_RPAREN { 1500 if1($3); 1501 clear_warning_flags(); 1502 } 1503 ; 1504 1505 switch_expr: /* see C99 6.8.4 */ 1506 T_SWITCH T_LPAREN expr T_RPAREN { 1507 switch1($3); 1508 clear_warning_flags(); 1509 } 1510 ; 1511 1512 do_statement: /* C99 6.8.5 */ 1513 do statement { 1514 clear_warning_flags(); 1515 } 1516 ; 1517 1518 iteration_statement: /* C99 6.8.5 */ 1519 while_expr statement { 1520 clear_warning_flags(); 1521 while2(); 1522 } 1523 | while_expr error { 1524 clear_warning_flags(); 1525 while2(); 1526 } 1527 | do_statement do_while_expr { 1528 do2($2); 1529 seen_fallthrough = false; 1530 } 1531 | do error { 1532 clear_warning_flags(); 1533 do2(NULL); 1534 } 1535 | for_exprs statement { 1536 clear_warning_flags(); 1537 for2(); 1538 end_declaration_level(); 1539 block_level--; 1540 } 1541 | for_exprs error { 1542 clear_warning_flags(); 1543 for2(); 1544 end_declaration_level(); 1545 block_level--; 1546 } 1547 ; 1548 1549 while_expr: /* see C99 6.8.5 */ 1550 T_WHILE T_LPAREN expr T_RPAREN { 1551 while1($3); 1552 clear_warning_flags(); 1553 } 1554 ; 1555 1556 do: /* see C99 6.8.5 */ 1557 T_DO { 1558 do1(); 1559 } 1560 ; 1561 1562 do_while_expr: /* see C99 6.8.5 */ 1563 T_WHILE T_LPAREN expr T_RPAREN T_SEMI { 1564 $$ = $3; 1565 } 1566 ; 1567 1568 for_start: /* see C99 6.8.5 */ 1569 T_FOR T_LPAREN { 1570 begin_declaration_level(AUTO); 1571 block_level++; 1572 } 1573 ; 1574 1575 for_exprs: /* see C99 6.8.5 */ 1576 for_start declaration_specifiers deftyp notype_init_decls T_SEMI 1577 expr_opt T_SEMI expr_opt T_RPAREN { 1578 /* variable declaration in for loop */ 1579 c99ism(325); 1580 for1(NULL, $6, $8); 1581 clear_warning_flags(); 1582 } 1583 | for_start expr_opt T_SEMI expr_opt T_SEMI expr_opt T_RPAREN { 1584 for1($2, $4, $6); 1585 clear_warning_flags(); 1586 } 1587 ; 1588 1589 jump_statement: /* C99 6.8.6 */ 1590 goto identifier T_SEMI { 1591 do_goto(getsym($2)); 1592 } 1593 | goto error T_SEMI { 1594 symtyp = FVFT; 1595 } 1596 | T_CONTINUE T_SEMI { 1597 do_continue(); 1598 } 1599 | T_BREAK T_SEMI { 1600 do_break(); 1601 } 1602 | T_RETURN T_SEMI { 1603 do_return(NULL); 1604 } 1605 | T_RETURN expr T_SEMI { 1606 do_return($2); 1607 } 1608 ; 1609 1610 goto: 1611 T_GOTO { 1612 symtyp = FLABEL; 1613 } 1614 ; 1615 1616 asm_statement: 1617 T_ASM T_LPAREN read_until_rparen T_SEMI { 1618 setasm(); 1619 } 1620 | T_ASM T_QUAL T_LPAREN read_until_rparen T_SEMI { 1621 setasm(); 1622 } 1623 | T_ASM error 1624 ; 1625 1626 read_until_rparen: 1627 /* empty */ { 1628 ignore_up_to_rparen(); 1629 } 1630 ; 1631 1632 constant_expr_list_opt: 1633 /* empty */ 1634 | constant_expr_list 1635 ; 1636 1637 constant_expr_list: 1638 constant_expr 1639 | constant_expr_list T_COMMA constant_expr 1640 ; 1641 1642 constant_expr: /* C99 6.6 */ 1643 expr %prec T_ASSIGN 1644 ; 1645 1646 expr_opt: 1647 /* empty */ { 1648 $$ = NULL; 1649 } 1650 | expr 1651 ; 1652 1653 expr: /* C99 6.5 */ 1654 expr T_ASTERISK expr { 1655 $$ = build(MULT, $1, $3); 1656 } 1657 | expr T_MULTIPLICATIVE expr { 1658 $$ = build($2, $1, $3); 1659 } 1660 | expr T_ADDITIVE expr { 1661 $$ = build($2, $1, $3); 1662 } 1663 | expr T_SHIFT expr { 1664 $$ = build($2, $1, $3); 1665 } 1666 | expr T_RELATIONAL expr { 1667 $$ = build($2, $1, $3); 1668 } 1669 | expr T_EQUALITY expr { 1670 $$ = build($2, $1, $3); 1671 } 1672 | expr T_AMPER expr { 1673 $$ = build(BITAND, $1, $3); 1674 } 1675 | expr T_BITXOR expr { 1676 $$ = build(BITXOR, $1, $3); 1677 } 1678 | expr T_BITOR expr { 1679 $$ = build(BITOR, $1, $3); 1680 } 1681 | expr T_LOGAND expr { 1682 $$ = build(LOGAND, $1, $3); 1683 } 1684 | expr T_LOGOR expr { 1685 $$ = build(LOGOR, $1, $3); 1686 } 1687 | expr T_QUEST expr T_COLON expr { 1688 $$ = build(QUEST, $1, build(COLON, $3, $5)); 1689 } 1690 | expr T_ASSIGN expr { 1691 $$ = build(ASSIGN, $1, $3); 1692 } 1693 | expr T_OPASSIGN expr { 1694 $$ = build($2, $1, $3); 1695 } 1696 | expr T_COMMA expr { 1697 $$ = build(COMMA, $1, $3); 1698 } 1699 | term 1700 | generic_selection 1701 ; 1702 1703 assignment_expression: /* C99 6.5.16 */ 1704 expr %prec T_ASSIGN 1705 ; 1706 1707 term: /* see C99 6.5.1 */ 1708 T_NAME { 1709 /* XXX really necessary? */ 1710 if (yychar < 0) 1711 yychar = yylex(); 1712 $$ = new_name_node(getsym($1), yychar); 1713 } 1714 | string { 1715 $$ = new_string_node($1); 1716 } 1717 | T_CON { 1718 $$ = expr_new_constant(gettyp($1->v_tspec), $1); 1719 } 1720 | T_LPAREN expr T_RPAREN { 1721 if ($2 != NULL) 1722 $2->tn_parenthesized = true; 1723 $$ = $2; 1724 } 1725 | T_LPAREN compound_statement_lbrace gcc_statement_expr_list { 1726 block_level--; 1727 mem_block_level--; 1728 begin_initialization(mktempsym(dup_type($3->tn_type))); 1729 mem_block_level++; 1730 block_level++; 1731 /* ({ }) is a GCC extension */ 1732 gnuism(320); 1733 } compound_statement_rbrace T_RPAREN { 1734 $$ = new_name_node(*current_initsym(), 0); 1735 end_initialization(); 1736 } 1737 | term T_INCDEC { 1738 $$ = build($2 == INC ? INCAFT : DECAFT, $1, NULL); 1739 } 1740 | T_INCDEC term { 1741 $$ = build($1 == INC ? INCBEF : DECBEF, $2, NULL); 1742 } 1743 | T_ASTERISK term { 1744 $$ = build(INDIR, $2, NULL); 1745 } 1746 | T_AMPER term { 1747 $$ = build(ADDR, $2, NULL); 1748 } 1749 | T_UNARY term { 1750 $$ = build($1, $2, NULL); 1751 } 1752 | T_ADDITIVE term { 1753 if (tflag && $1 == PLUS) { 1754 /* unary + is illegal in traditional C */ 1755 warning(100); 1756 } 1757 $$ = build($1 == PLUS ? UPLUS : UMINUS, $2, NULL); 1758 } 1759 | term T_LBRACK expr T_RBRACK { 1760 $$ = build(INDIR, build(PLUS, $1, $3), NULL); 1761 } 1762 | term T_LPAREN T_RPAREN { 1763 $$ = new_function_call_node($1, NULL); 1764 } 1765 | term T_LPAREN func_arg_list T_RPAREN { 1766 $$ = new_function_call_node($1, $3); 1767 } 1768 | term point_or_arrow T_NAME { 1769 if ($1 != NULL) { 1770 sym_t *msym; 1771 /* 1772 * XXX struct_or_union_member should be integrated 1773 * in build() 1774 */ 1775 if ($2 == ARROW) { 1776 /* 1777 * must do this before struct_or_union_member 1778 * is called 1779 */ 1780 $1 = cconv($1); 1781 } 1782 msym = struct_or_union_member($1, $2, getsym($3)); 1783 $$ = build($2, $1, new_name_node(msym, 0)); 1784 } else { 1785 $$ = NULL; 1786 } 1787 } 1788 | T_REAL term { 1789 $$ = build(REAL, $2, NULL); 1790 } 1791 | T_IMAG term { 1792 $$ = build(IMAG, $2, NULL); 1793 } 1794 | T_EXTENSION term { 1795 $$ = $2; 1796 } 1797 | T_BUILTIN_OFFSETOF T_LPAREN type_name T_COMMA identifier T_RPAREN { 1798 symtyp = FMEMBER; 1799 $$ = build_offsetof($3, getsym($5)); 1800 } 1801 | T_SIZEOF term { 1802 $$ = $2 == NULL ? NULL : build_sizeof($2->tn_type); 1803 if ($$ != NULL) 1804 check_expr_misc($2, false, false, false, false, false, true); 1805 } 1806 | T_SIZEOF T_LPAREN type_name T_RPAREN %prec T_SIZEOF { 1807 $$ = build_sizeof($3); 1808 } 1809 | T_ALIGNOF T_LPAREN type_name T_RPAREN { 1810 $$ = build_alignof($3); 1811 } 1812 | T_LPAREN type_name T_RPAREN term %prec T_UNARY { 1813 $$ = cast($4, $2); 1814 } 1815 | T_LPAREN type_name T_RPAREN { /* C99 6.5.2.5 "Compound literals" */ 1816 sym_t *tmp = mktempsym($2); 1817 begin_initialization(tmp); 1818 cgram_declare(tmp, true, NULL); 1819 } init_lbrace initializer_list comma_opt init_rbrace { 1820 if (!Sflag) 1821 /* compound literals are a C9X/GCC extension */ 1822 gnuism(319); 1823 $$ = new_name_node(*current_initsym(), 0); 1824 end_initialization(); 1825 } 1826 ; 1827 1828 generic_selection: /* C11 6.5.1.1 */ 1829 T_GENERIC T_LPAREN assignment_expression T_COMMA 1830 generic_assoc_list T_RPAREN { 1831 /* generic selection requires C11 or later */ 1832 c11ism(345); 1833 $$ = build_generic_selection($3, $5); 1834 } 1835 ; 1836 1837 generic_assoc_list: /* C11 6.5.1.1 */ 1838 generic_association 1839 | generic_assoc_list T_COMMA generic_association { 1840 $3->ga_prev = $1; 1841 $$ = $3; 1842 } 1843 ; 1844 1845 generic_association: /* C11 6.5.1.1 */ 1846 type_name T_COLON assignment_expression { 1847 $$ = getblk(sizeof(*$$)); 1848 $$->ga_arg = $1; 1849 $$->ga_result = $3; 1850 } 1851 | T_DEFAULT T_COLON assignment_expression { 1852 $$ = getblk(sizeof(*$$)); 1853 $$->ga_arg = NULL; 1854 $$->ga_result = $3; 1855 } 1856 ; 1857 1858 /* 1859 * The inner part of a GCC statement-expression of the form ({ ... }). 1860 * 1861 * https://gcc.gnu.org/onlinedocs/gcc/Statement-Exprs.html 1862 */ 1863 gcc_statement_expr_list: 1864 gcc_statement_expr_item 1865 | gcc_statement_expr_list gcc_statement_expr_item { 1866 $$ = $2; 1867 } 1868 ; 1869 1870 gcc_statement_expr_item: 1871 declaration { 1872 clear_warning_flags(); 1873 $$ = NULL; 1874 } 1875 | non_expr_statement { 1876 $$ = expr_zalloc_tnode(); 1877 $$->tn_type = gettyp(VOID); 1878 } 1879 | expr T_SEMI { 1880 if ($1 == NULL) { /* in case of syntax errors */ 1881 $$ = expr_zalloc_tnode(); 1882 $$->tn_type = gettyp(VOID); 1883 } else { 1884 /* XXX: do that only on the last name */ 1885 if ($1->tn_op == NAME) 1886 $1->tn_sym->s_used = true; 1887 $$ = $1; 1888 expr($1, false, false, false, false); 1889 seen_fallthrough = false; 1890 } 1891 } 1892 ; 1893 1894 string: 1895 T_STRING 1896 | T_STRING string2 { 1897 $$ = cat_strings($1, $2); 1898 } 1899 ; 1900 1901 string2: 1902 T_STRING { 1903 if (tflag) { 1904 /* concatenated strings are illegal in traditional C */ 1905 warning(219); 1906 } 1907 $$ = $1; 1908 } 1909 | string2 T_STRING { 1910 $$ = cat_strings($1, $2); 1911 } 1912 ; 1913 1914 func_arg_list: 1915 expr %prec T_COMMA { 1916 $$ = new_function_argument_node(NULL, $1); 1917 } 1918 | func_arg_list T_COMMA expr { 1919 $$ = new_function_argument_node($1, $3); 1920 } 1921 ; 1922 1923 point_or_arrow: 1924 T_POINT { 1925 symtyp = FMEMBER; 1926 $$ = POINT; 1927 } 1928 | T_ARROW { 1929 symtyp = FMEMBER; 1930 $$ = ARROW; 1931 } 1932 ; 1933 1934 identifier: /* C99 6.4.2.1 */ 1935 T_NAME { 1936 $$ = $1; 1937 cgram_debug("name '%s'", $$->sb_name); 1938 } 1939 | T_TYPENAME { 1940 $$ = $1; 1941 cgram_debug("typename '%s'", $$->sb_name); 1942 } 1943 ; 1944 1945 comma_opt: 1946 /* empty */ 1947 | T_COMMA 1948 ; 1949 1950 /* GCC extensions */ 1951 1952 type_attribute_list_opt: 1953 /* empty */ 1954 | type_attribute_list 1955 ; 1956 1957 type_attribute_list: 1958 type_attribute 1959 | type_attribute_list type_attribute 1960 ; 1961 1962 type_attribute_opt: 1963 /* empty */ 1964 | type_attribute 1965 ; 1966 1967 type_attribute: 1968 gcc_attribute 1969 | T_ALIGNAS T_LPAREN align_as T_RPAREN 1970 | T_PACKED { 1971 addpacked(); 1972 } 1973 | T_NORETURN 1974 ; 1975 1976 gcc_attribute_list_opt: 1977 /* empty */ 1978 | gcc_attribute_list 1979 ; 1980 1981 gcc_attribute_list: 1982 gcc_attribute 1983 | gcc_attribute_list gcc_attribute 1984 ; 1985 1986 /* https://gcc.gnu.org/onlinedocs/gcc/Attribute-Syntax.html */ 1987 gcc_attribute: 1988 T_ATTRIBUTE T_LPAREN T_LPAREN { 1989 attron = true; 1990 } gcc_attribute_spec_list { 1991 attron = false; 1992 } T_RPAREN T_RPAREN 1993 ; 1994 1995 gcc_attribute_spec_list: 1996 gcc_attribute_spec 1997 | gcc_attribute_spec_list T_COMMA gcc_attribute_spec 1998 ; 1999 2000 gcc_attribute_spec: 2001 /* empty */ 2002 | T_AT_ALWAYS_INLINE 2003 | T_AT_ALIAS T_LPAREN string T_RPAREN 2004 | T_AT_ALIGNED T_LPAREN constant_expr T_RPAREN 2005 | T_AT_ALIGNED 2006 | T_AT_ALLOC_SIZE T_LPAREN constant_expr T_COMMA constant_expr T_RPAREN 2007 | T_AT_ALLOC_SIZE T_LPAREN constant_expr T_RPAREN 2008 | T_AT_BOUNDED T_LPAREN gcc_attribute_bounded 2009 T_COMMA constant_expr T_COMMA constant_expr T_RPAREN 2010 | T_AT_COLD 2011 | T_AT_COMMON 2012 | T_AT_CONSTRUCTOR T_LPAREN constant_expr T_RPAREN 2013 | T_AT_CONSTRUCTOR 2014 | T_AT_DEPRECATED T_LPAREN string T_RPAREN 2015 | T_AT_DEPRECATED 2016 | T_AT_DESTRUCTOR T_LPAREN constant_expr T_RPAREN 2017 | T_AT_DESTRUCTOR 2018 | T_AT_FALLTHROUGH { 2019 fallthru(1); 2020 } 2021 | T_AT_FORMAT T_LPAREN gcc_attribute_format T_COMMA 2022 constant_expr T_COMMA constant_expr T_RPAREN 2023 | T_AT_FORMAT_ARG T_LPAREN constant_expr T_RPAREN 2024 | T_AT_GNU_INLINE 2025 | T_AT_MALLOC 2026 | T_AT_MAY_ALIAS 2027 | T_AT_MODE T_LPAREN T_NAME T_RPAREN 2028 | T_AT_NOINLINE 2029 | T_AT_NONNULL T_LPAREN constant_expr_list_opt T_RPAREN 2030 | T_AT_NONNULL 2031 | T_AT_NONSTRING 2032 | T_AT_NORETURN 2033 | T_AT_NOTHROW 2034 | T_AT_NO_INSTRUMENT_FUNCTION 2035 | T_AT_OPTIMIZE T_LPAREN string T_RPAREN 2036 | T_AT_PACKED { 2037 addpacked(); 2038 } 2039 | T_AT_PCS T_LPAREN string T_RPAREN 2040 | T_AT_PURE 2041 | T_AT_RETURNS_TWICE 2042 | T_AT_SECTION T_LPAREN string T_RPAREN 2043 | T_AT_SENTINEL T_LPAREN constant_expr T_RPAREN 2044 | T_AT_SENTINEL 2045 | T_AT_TLS_MODEL T_LPAREN string T_RPAREN 2046 | T_AT_TUNION 2047 | T_AT_UNUSED { 2048 add_attr_used(); 2049 } 2050 | T_AT_USED { 2051 add_attr_used(); 2052 } 2053 | T_AT_VISIBILITY T_LPAREN constant_expr T_RPAREN 2054 | T_AT_WARN_UNUSED_RESULT 2055 | T_AT_WEAK 2056 | T_QUAL { 2057 if ($1 != CONST) 2058 yyerror("Bad attribute"); 2059 } 2060 ; 2061 2062 gcc_attribute_bounded: 2063 T_AT_MINBYTES 2064 | T_AT_STRING 2065 | T_AT_BUFFER 2066 ; 2067 2068 gcc_attribute_format: 2069 T_AT_FORMAT_GNU_PRINTF 2070 | T_AT_FORMAT_PRINTF 2071 | T_AT_FORMAT_SCANF 2072 | T_AT_FORMAT_STRFMON 2073 | T_AT_FORMAT_STRFTIME 2074 | T_AT_FORMAT_SYSLOG 2075 ; 2076 2077 %% 2078 2079 /* ARGSUSED */ 2080 int 2081 yyerror(const char *msg) 2082 { 2083 /* syntax error '%s' */ 2084 error(249, yytext); 2085 if (++sytxerr >= 5) 2086 norecover(); 2087 return 0; 2088 } 2089 2090 static void 2091 cgram_declare(sym_t *decl, bool initflg, sbuf_t *renaming) 2092 { 2093 declare(decl, initflg, renaming); 2094 if (renaming != NULL) 2095 freeyyv(&renaming, T_NAME); 2096 } 2097 2098 /* 2099 * Discard all input tokens up to and including the next 2100 * unmatched right paren 2101 */ 2102 static void 2103 ignore_up_to_rparen(void) 2104 { 2105 int level; 2106 2107 if (yychar < 0) 2108 yychar = yylex(); 2109 freeyyv(&yylval, yychar); 2110 2111 level = 1; 2112 while (yychar != T_RPAREN || --level > 0) { 2113 if (yychar == T_LPAREN) { 2114 level++; 2115 } else if (yychar <= 0) { 2116 break; 2117 } 2118 freeyyv(&yylval, yychar = yylex()); 2119 } 2120 2121 yyclearin; 2122 } 2123 2124 static sym_t * 2125 symbolrename(sym_t *s, sbuf_t *sb) 2126 { 2127 if (sb != NULL) 2128 s->s_rename = sb->sb_name; 2129 return s; 2130 } 2131
Indexes created Thu Oct 02 14:10:14 GMT 2025