cgram.y revision 1.260
1 %{ 2 /* $NetBSD: cgram.y,v 1.260 2021/07/06 18:22:40 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 1.260 2021/07/06 18:22:40 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 166 127 128 %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 /* Type Attributes */ 211 %token <y_type> T_ATTRIBUTE 212 %token <y_type> T_AT_ALIAS 213 %token <y_type> T_AT_ALIGNED 214 %token <y_type> T_AT_ALLOC_SIZE 215 %token <y_type> T_AT_ALWAYS_INLINE 216 %token <y_type> T_AT_BOUNDED 217 %token <y_type> T_AT_BUFFER 218 %token <y_type> T_AT_COLD 219 %token <y_type> T_AT_COMMON 220 %token <y_type> T_AT_CONSTRUCTOR 221 %token <y_type> T_AT_DEPRECATED 222 %token <y_type> T_AT_DESTRUCTOR 223 %token <y_type> T_AT_FALLTHROUGH 224 %token <y_type> T_AT_FORMAT 225 %token <y_type> T_AT_FORMAT_ARG 226 %token <y_type> T_AT_FORMAT_GNU_PRINTF 227 %token <y_type> T_AT_FORMAT_PRINTF 228 %token <y_type> T_AT_FORMAT_SCANF 229 %token <y_type> T_AT_FORMAT_STRFMON 230 %token <y_type> T_AT_FORMAT_STRFTIME 231 %token <y_type> T_AT_FORMAT_SYSLOG 232 %token <y_type> T_AT_GNU_INLINE 233 %token <y_type> T_AT_MALLOC 234 %token <y_type> T_AT_MAY_ALIAS 235 %token <y_type> T_AT_MINBYTES 236 %token <y_type> T_AT_MODE 237 %token <y_type> T_AT_NOINLINE 238 %token <y_type> T_AT_NONNULL 239 %token <y_type> T_AT_NONSTRING 240 %token <y_type> T_AT_NORETURN 241 %token <y_type> T_AT_NOTHROW 242 %token <y_type> T_AT_NO_INSTRUMENT_FUNCTION 243 %token <y_type> T_AT_OPTIMIZE 244 %token <y_type> T_AT_PACKED 245 %token <y_type> T_AT_PCS 246 %token <y_type> T_AT_PURE 247 %token <y_type> T_AT_RETURNS_TWICE 248 %token <y_type> T_AT_SECTION 249 %token <y_type> T_AT_SENTINEL 250 %token <y_type> T_AT_STRING 251 %token <y_type> T_AT_TLS_MODEL 252 %token <y_type> T_AT_TUNION 253 %token <y_type> T_AT_UNUSED 254 %token <y_type> T_AT_USED 255 %token <y_type> T_AT_VISIBILITY 256 %token <y_type> T_AT_WARN_UNUSED_RESULT 257 %token <y_type> 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_with_rbrace 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 %% 348 349 program: 350 /* empty */ { 351 if (sflag) { 352 /* empty translation unit */ 353 error(272); 354 } else if (!tflag) { 355 /* empty translation unit */ 356 warning(272); 357 } 358 } 359 | translation_unit 360 ; 361 362 translation_unit: /* C99 6.9 */ 363 external_declaration 364 | translation_unit external_declaration 365 ; 366 367 external_declaration: /* C99 6.9 */ 368 asm_statement 369 | function_definition { 370 global_clean_up_decl(false); 371 clear_warning_flags(); 372 } 373 | top_level_declaration { 374 global_clean_up_decl(false); 375 clear_warning_flags(); 376 } 377 ; 378 379 /* 380 * On the top level, lint allows several forms of declarations that it doesn't 381 * allow in functions. For example, a single ';' is an empty declaration and 382 * is supported by some compilers, but in a function it would be an empty 383 * statement, not a declaration. This makes a difference in C90 mode, where 384 * a statement must not be followed by a declaration. 385 * 386 * See 'declaration' for all other declarations. 387 */ 388 top_level_declaration: /* C99 6.9 calls this 'declaration' */ 389 T_SEMI { 390 if (sflag) { 391 /* empty declaration */ 392 error(0); 393 } else if (!tflag) { 394 /* empty declaration */ 395 warning(0); 396 } 397 } 398 | clrtyp deftyp notype_init_decls T_SEMI { 399 if (sflag) { 400 /* old style declaration; add 'int' */ 401 error(1); 402 } else if (!tflag) { 403 /* old style declaration; add 'int' */ 404 warning(1); 405 } 406 } 407 | declmods deftyp T_SEMI { 408 if (dcs->d_scl == TYPEDEF) { 409 /* typedef declares no type name */ 410 warning(72); 411 } else { 412 /* empty declaration */ 413 warning(2); 414 } 415 } 416 | declmods deftyp notype_init_decls T_SEMI 417 | declaration_specifiers deftyp T_SEMI { 418 if (dcs->d_scl == TYPEDEF) { 419 /* typedef declares no type name */ 420 warning(72); 421 } else if (!dcs->d_nonempty_decl) { 422 /* empty declaration */ 423 warning(2); 424 } 425 } 426 | declaration_specifiers deftyp type_init_decls T_SEMI 427 | error T_SEMI { 428 global_clean_up(); 429 } 430 | error T_RBRACE { 431 global_clean_up(); 432 } 433 ; 434 435 function_definition: /* C99 6.9.1 */ 436 func_decl { 437 if ($1->s_type->t_tspec != FUNC) { 438 /* syntax error '%s' */ 439 error(249, yytext); 440 YYERROR; 441 } 442 if ($1->s_type->t_typedef) { 443 /* ()-less function definition */ 444 error(64); 445 YYERROR; 446 } 447 funcdef($1); 448 block_level++; 449 begin_declaration_level(ARG); 450 if (lwarn == LWARN_NONE) 451 $1->s_used = true; 452 } arg_declaration_list_opt { 453 end_declaration_level(); 454 block_level--; 455 check_func_lint_directives(); 456 check_func_old_style_arguments(); 457 begin_control_statement(CS_FUNCTION_BODY); 458 } compound_statement { 459 funcend(); 460 end_control_statement(CS_FUNCTION_BODY); 461 } 462 ; 463 464 func_decl: 465 clrtyp deftyp notype_decl { 466 $$ = $3; 467 } 468 | declmods deftyp notype_decl { 469 $$ = $3; 470 } 471 | declaration_specifiers deftyp type_decl { 472 $$ = $3; 473 } 474 ; 475 476 arg_declaration_list_opt: /* C99 6.9.1p13 example 1 */ 477 /* empty */ 478 | arg_declaration_list 479 ; 480 481 arg_declaration_list: /* C99 6.9.1p13 example 1 */ 482 arg_declaration 483 | arg_declaration_list arg_declaration 484 /* XXX or better "arg_declaration error" ? */ 485 | error 486 ; 487 488 /* 489 * "arg_declaration" is separated from "declaration" because it 490 * needs other error handling. 491 */ 492 arg_declaration: 493 declmods deftyp T_SEMI { 494 /* empty declaration */ 495 warning(2); 496 } 497 | declmods deftyp notype_init_decls T_SEMI 498 | declaration_specifiers deftyp T_SEMI { 499 if (!dcs->d_nonempty_decl) { 500 /* empty declaration */ 501 warning(2); 502 } else { 503 /* '%s' declared in argument declaration list */ 504 warning(3, type_name(dcs->d_type)); 505 } 506 } 507 | declaration_specifiers deftyp type_init_decls T_SEMI { 508 if (dcs->d_nonempty_decl) { 509 /* '%s' declared in argument declaration list */ 510 warning(3, type_name(dcs->d_type)); 511 } 512 } 513 | declmods error 514 | declaration_specifiers error 515 ; 516 517 declaration: /* C99 6.7 */ 518 declmods deftyp T_SEMI { 519 if (dcs->d_scl == TYPEDEF) { 520 /* typedef declares no type name */ 521 warning(72); 522 } else { 523 /* empty declaration */ 524 warning(2); 525 } 526 } 527 | declmods deftyp notype_init_decls T_SEMI 528 | declaration_specifiers deftyp T_SEMI { 529 if (dcs->d_scl == TYPEDEF) { 530 /* typedef declares no type name */ 531 warning(72); 532 } else if (!dcs->d_nonempty_decl) { 533 /* empty declaration */ 534 warning(2); 535 } 536 } 537 | declaration_specifiers deftyp type_init_decls T_SEMI 538 | error T_SEMI 539 ; 540 541 clrtyp: 542 /* empty */ { 543 clrtyp(); 544 } 545 ; 546 547 deftyp: 548 /* empty */ { 549 deftyp(); 550 } 551 ; 552 553 declaration_specifiers: /* C99 6.7 */ 554 clrtyp_typespec { 555 add_type($1); 556 } 557 | declmods typespec { 558 add_type($2); 559 } 560 | type_attribute declaration_specifiers 561 | declaration_specifiers declmod 562 | declaration_specifiers notype_typespec { 563 add_type($2); 564 } 565 ; 566 567 declmods: 568 clrtyp T_QUAL { 569 add_qualifier($2); 570 } 571 | clrtyp T_SCLASS { 572 add_storage_class($2); 573 } 574 | declmods declmod 575 ; 576 577 declmod: 578 T_QUAL { 579 add_qualifier($1); 580 } 581 | T_SCLASS { 582 add_storage_class($1); 583 } 584 | type_attribute 585 ; 586 587 clrtyp_typespec: 588 clrtyp notype_typespec { 589 $$ = $2; 590 } 591 | T_TYPENAME clrtyp { 592 $$ = getsym($1)->s_type; 593 } 594 ; 595 596 typespec: 597 notype_typespec 598 | T_TYPENAME { 599 $$ = getsym($1)->s_type; 600 } 601 ; 602 603 notype_typespec: 604 T_TYPE { 605 $$ = gettyp($1); 606 } 607 | T_TYPEOF term { 608 $$ = $2->tn_type; 609 } 610 | struct_spec { 611 end_declaration_level(); 612 $$ = $1; 613 } 614 | enum_spec { 615 end_declaration_level(); 616 $$ = $1; 617 } 618 ; 619 620 struct_spec: 621 struct struct_tag { 622 /* 623 * STDC requires that "struct a;" always introduces 624 * a new tag if "a" is not declared at current level 625 * 626 * yychar is valid because otherwise the parser would not 627 * have been able to decide if it must shift or reduce 628 */ 629 $$ = mktag($2, $1, false, yychar == T_SEMI); 630 } 631 | struct struct_tag { 632 dcs->d_tagtyp = mktag($2, $1, true, false); 633 } struct_declaration { 634 $$ = complete_tag_struct_or_union(dcs->d_tagtyp, $4); 635 } 636 | struct { 637 dcs->d_tagtyp = mktag(NULL, $1, true, false); 638 } struct_declaration { 639 $$ = complete_tag_struct_or_union(dcs->d_tagtyp, $3); 640 } 641 | struct error { 642 symtyp = FVFT; 643 $$ = gettyp(INT); 644 } 645 ; 646 647 struct: 648 struct type_attribute 649 | T_STRUCT_OR_UNION { 650 symtyp = FTAG; 651 begin_declaration_level($1 == STRUCT ? MOS : MOU); 652 dcs->d_offset = 0; 653 dcs->d_sou_align_in_bits = CHAR_SIZE; 654 $$ = $1; 655 } 656 ; 657 658 struct_tag: 659 identifier { 660 $$ = getsym($1); 661 } 662 ; 663 664 struct_declaration: 665 struct_decl_lbrace member_declaration_list_with_rbrace { 666 $$ = $2; 667 } 668 ; 669 670 struct_decl_lbrace: 671 T_LBRACE { 672 symtyp = FVFT; 673 } 674 ; 675 676 member_declaration_list_with_rbrace: 677 member_declaration_list T_SEMI T_RBRACE 678 | member_declaration_list T_RBRACE { 679 if (sflag) { 680 /* syntax req. ';' after last struct/union member */ 681 error(66); 682 } else { 683 /* syntax req. ';' after last struct/union member */ 684 warning(66); 685 } 686 $$ = $1; 687 } 688 | T_RBRACE { 689 $$ = NULL; 690 } 691 ; 692 693 type_attribute_opt: 694 /* empty */ 695 | type_attribute 696 ; 697 698 member_declaration_list: 699 member_declaration 700 | member_declaration_list T_SEMI member_declaration { 701 $$ = lnklst($1, $3); 702 } 703 ; 704 705 member_declaration: 706 noclass_declmods deftyp { 707 /* too late, i know, but getsym() compensates it */ 708 symtyp = FMEMBER; 709 } notype_member_decls type_attribute_opt { 710 symtyp = FVFT; 711 $$ = $4; 712 } 713 | noclass_declspecs deftyp { 714 symtyp = FMEMBER; 715 } type_member_decls type_attribute_opt { 716 symtyp = FVFT; 717 $$ = $4; 718 } 719 | noclass_declmods deftyp type_attribute_opt { 720 symtyp = FVFT; 721 /* struct or union member must be named */ 722 if (!Sflag) 723 /* anonymous struct/union members is a C9X feature */ 724 warning(49); 725 /* add all the members of the anonymous struct/union */ 726 lint_assert(is_struct_or_union(dcs->d_type->t_tspec)); 727 $$ = dcs->d_type->t_str->sou_first_member; 728 anonymize($$); 729 } 730 | noclass_declspecs deftyp type_attribute_opt { 731 symtyp = FVFT; 732 /* struct or union member must be named */ 733 if (!Sflag) 734 /* anonymous struct/union members is a C9X feature */ 735 warning(49); 736 if (is_struct_or_union(dcs->d_type->t_tspec)) { 737 $$ = dcs->d_type->t_str->sou_first_member; 738 /* add all the members of the anonymous struct/union */ 739 anonymize($$); 740 } else { 741 /* syntax error '%s' */ 742 error(249, "unnamed member"); 743 $$ = NULL; 744 } 745 } 746 | error { 747 symtyp = FVFT; 748 $$ = NULL; 749 } 750 ; 751 752 noclass_declspecs: 753 clrtyp_typespec { 754 add_type($1); 755 } 756 | type_attribute noclass_declspecs 757 | noclass_declmods typespec { 758 add_type($2); 759 } 760 | noclass_declspecs T_QUAL { 761 add_qualifier($2); 762 } 763 | noclass_declspecs notype_typespec { 764 add_type($2); 765 } 766 | noclass_declspecs type_attribute 767 ; 768 769 noclass_declmods: 770 clrtyp T_QUAL { 771 add_qualifier($2); 772 } 773 | noclass_declmods T_QUAL { 774 add_qualifier($2); 775 } 776 ; 777 778 notype_member_decls: 779 notype_member_decl { 780 $$ = declarator_1_struct_union($1); 781 } 782 | notype_member_decls { 783 symtyp = FMEMBER; 784 } T_COMMA type_member_decl { 785 $$ = lnklst($1, declarator_1_struct_union($4)); 786 } 787 ; 788 789 type_member_decls: 790 type_member_decl { 791 $$ = declarator_1_struct_union($1); 792 } 793 | type_member_decls { 794 symtyp = FMEMBER; 795 } T_COMMA type_member_decl { 796 $$ = lnklst($1, declarator_1_struct_union($4)); 797 } 798 ; 799 800 notype_member_decl: 801 notype_decl 802 | notype_decl T_COLON constant_expr { /* C99 6.7.2.1 */ 803 $$ = bitfield($1, to_int_constant($3, true)); 804 } 805 | { 806 symtyp = FVFT; 807 } T_COLON constant_expr { /* C99 6.7.2.1 */ 808 $$ = bitfield(NULL, to_int_constant($3, true)); 809 } 810 ; 811 812 type_member_decl: 813 type_decl 814 | type_decl T_COLON constant_expr { 815 $$ = bitfield($1, to_int_constant($3, true)); 816 } 817 | { 818 symtyp = FVFT; 819 } T_COLON constant_expr { 820 $$ = bitfield(NULL, to_int_constant($3, true)); 821 } 822 ; 823 824 enum_spec: 825 enum enum_tag { 826 $$ = mktag($2, ENUM, false, false); 827 } 828 | enum enum_tag { 829 dcs->d_tagtyp = mktag($2, ENUM, true, false); 830 } enum_declaration { 831 $$ = complete_tag_enum(dcs->d_tagtyp, $4); 832 } 833 | enum { 834 dcs->d_tagtyp = mktag(NULL, ENUM, true, false); 835 } enum_declaration { 836 $$ = complete_tag_enum(dcs->d_tagtyp, $3); 837 } 838 | enum error { 839 symtyp = FVFT; 840 $$ = gettyp(INT); 841 } 842 ; 843 844 enum: 845 T_ENUM { 846 symtyp = FTAG; 847 begin_declaration_level(CTCONST); 848 } 849 ; 850 851 enum_tag: 852 identifier { 853 $$ = getsym($1); 854 } 855 ; 856 857 enum_declaration: 858 enum_decl_lbrace enumerator_list enumerator_list_comma_opt T_RBRACE { 859 $$ = $2; 860 } 861 ; 862 863 enum_decl_lbrace: 864 T_LBRACE { 865 symtyp = FVFT; 866 enumval = 0; 867 } 868 ; 869 870 enumerator_list: /* C99 6.7.2.2 */ 871 enumerator 872 | enumerator_list T_COMMA enumerator { 873 $$ = lnklst($1, $3); 874 } 875 | error { 876 $$ = NULL; 877 } 878 ; 879 880 enumerator_list_comma_opt: 881 /* empty */ 882 | T_COMMA { 883 if (sflag) { 884 /* trailing ',' prohibited in enum declaration */ 885 error(54); 886 } else { 887 /* trailing ',' prohibited in enum declaration */ 888 c99ism(54); 889 } 890 } 891 ; 892 893 enumerator: /* C99 6.7.2.2 */ 894 enumeration_constant { 895 $$ = enumeration_constant($1, enumval, true); 896 } 897 | enumeration_constant T_ASSIGN constant_expr { 898 $$ = enumeration_constant($1, to_int_constant($3, true), false); 899 } 900 ; 901 902 enumeration_constant: /* C99 6.4.4.3 */ 903 identifier { 904 $$ = getsym($1); 905 } 906 ; 907 908 909 /* 910 * For an explanation of 'notype' in the following rules, see the Bison 911 * manual, section 7.1 "Semantic Info in Token Kinds". 912 */ 913 914 notype_init_decls: 915 notype_init_decl 916 | notype_init_decls T_COMMA type_init_decl 917 ; 918 919 type_init_decls: 920 type_init_decl 921 | type_init_decls T_COMMA type_init_decl 922 ; 923 924 notype_init_decl: 925 notype_decl asm_or_symbolrename_opt { 926 cgram_declare($1, false, $2); 927 check_size($1); 928 } 929 | notype_decl asm_or_symbolrename_opt { 930 begin_initialization($1); 931 cgram_declare($1, true, $2); 932 } T_ASSIGN initializer { 933 check_size($1); 934 end_initialization(); 935 } 936 ; 937 938 type_init_decl: 939 type_decl asm_or_symbolrename_opt { 940 cgram_declare($1, false, $2); 941 check_size($1); 942 } 943 | type_decl asm_or_symbolrename_opt { 944 begin_initialization($1); 945 cgram_declare($1, true, $2); 946 } T_ASSIGN initializer { 947 check_size($1); 948 end_initialization(); 949 } 950 ; 951 952 notype_decl: 953 notype_direct_decl 954 | pointer notype_direct_decl { 955 $$ = add_pointer($2, $1); 956 } 957 ; 958 959 type_decl: 960 type_direct_decl 961 | pointer type_direct_decl { 962 $$ = add_pointer($2, $1); 963 } 964 ; 965 966 notype_direct_decl: 967 T_NAME { 968 $$ = declarator_name(getsym($1)); 969 } 970 | T_LPAREN type_decl T_RPAREN { 971 $$ = $2; 972 } 973 | type_attribute notype_direct_decl { 974 $$ = $2; 975 } 976 | notype_direct_decl T_LBRACK T_RBRACK { 977 $$ = add_array($1, false, 0); 978 } 979 | notype_direct_decl T_LBRACK array_size T_RBRACK { 980 $$ = add_array($1, true, to_int_constant($3, false)); 981 } 982 | notype_direct_decl param_list asm_or_symbolrename_opt { 983 $$ = add_function(symbolrename($1, $3), $2); 984 end_declaration_level(); 985 block_level--; 986 } 987 | notype_direct_decl type_attribute 988 ; 989 990 type_direct_decl: 991 identifier { 992 $$ = declarator_name(getsym($1)); 993 } 994 | T_LPAREN type_decl T_RPAREN { 995 $$ = $2; 996 } 997 | type_attribute type_direct_decl { 998 $$ = $2; 999 } 1000 | type_direct_decl T_LBRACK T_RBRACK { 1001 $$ = add_array($1, false, 0); 1002 } 1003 | type_direct_decl T_LBRACK array_size T_RBRACK { 1004 $$ = add_array($1, true, to_int_constant($3, false)); 1005 } 1006 | type_direct_decl param_list asm_or_symbolrename_opt { 1007 $$ = add_function(symbolrename($1, $3), $2); 1008 end_declaration_level(); 1009 block_level--; 1010 } 1011 | type_direct_decl type_attribute 1012 ; 1013 1014 /* 1015 * The two distinct rules type_param_decl and notype_param_decl avoid a 1016 * conflict in argument lists. A typename enclosed in parentheses is always 1017 * treated as a typename, not an argument name. For example, after 1018 * "typedef double a;", the declaration "f(int (a));" is interpreted as 1019 * "f(int (double));", not "f(int a);". 1020 */ 1021 type_param_decl: 1022 direct_param_decl 1023 | pointer direct_param_decl { 1024 $$ = add_pointer($2, $1); 1025 } 1026 ; 1027 1028 notype_param_decl: 1029 direct_notype_param_decl 1030 | pointer direct_notype_param_decl { 1031 $$ = add_pointer($2, $1); 1032 } 1033 ; 1034 1035 direct_param_decl: 1036 identifier type_attribute_list { 1037 $$ = declarator_name(getsym($1)); 1038 } 1039 | identifier { 1040 $$ = declarator_name(getsym($1)); 1041 } 1042 | T_LPAREN notype_param_decl T_RPAREN { 1043 $$ = $2; 1044 } 1045 | direct_param_decl T_LBRACK T_RBRACK { 1046 $$ = add_array($1, false, 0); 1047 } 1048 | direct_param_decl T_LBRACK array_size T_RBRACK { 1049 $$ = add_array($1, true, to_int_constant($3, false)); 1050 } 1051 | direct_param_decl param_list asm_or_symbolrename_opt { 1052 $$ = add_function(symbolrename($1, $3), $2); 1053 end_declaration_level(); 1054 block_level--; 1055 } 1056 ; 1057 1058 direct_notype_param_decl: 1059 /* XXX: missing identifier type_attribute_list? */ 1060 identifier { 1061 $$ = declarator_name(getsym($1)); 1062 } 1063 | T_LPAREN notype_param_decl T_RPAREN { 1064 $$ = $2; 1065 } 1066 | direct_notype_param_decl T_LBRACK T_RBRACK { 1067 $$ = add_array($1, false, 0); 1068 } 1069 | direct_notype_param_decl T_LBRACK array_size T_RBRACK { 1070 $$ = add_array($1, true, to_int_constant($3, false)); 1071 } 1072 | direct_notype_param_decl param_list asm_or_symbolrename_opt { 1073 $$ = add_function(symbolrename($1, $3), $2); 1074 end_declaration_level(); 1075 block_level--; 1076 } 1077 ; 1078 1079 pointer: /* C99 6.7.5 */ 1080 asterisk type_qualifier_list_opt { 1081 $$ = merge_qualified_pointer($1, $2); 1082 } 1083 | asterisk type_qualifier_list_opt pointer { 1084 $$ = merge_qualified_pointer($1, $2); 1085 $$ = merge_qualified_pointer($$, $3); 1086 } 1087 ; 1088 1089 asterisk: 1090 T_ASTERISK { 1091 $$ = xcalloc(1, sizeof(*$$)); 1092 $$->p_pointer = true; 1093 } 1094 ; 1095 1096 type_qualifier_list_opt: 1097 /* empty */ { 1098 $$ = NULL; 1099 } 1100 | type_qualifier_list 1101 ; 1102 1103 type_qualifier_list: /* C99 6.7.5 */ 1104 type_qualifier 1105 | type_qualifier_list type_qualifier { 1106 $$ = merge_qualified_pointer($1, $2); 1107 } 1108 ; 1109 1110 type_qualifier: 1111 T_QUAL { 1112 $$ = xcalloc(1, sizeof(*$$)); 1113 if ($1 == CONST) { 1114 $$->p_const = true; 1115 } else if ($1 == VOLATILE) { 1116 $$->p_volatile = true; 1117 } else { 1118 lint_assert($1 == RESTRICT || $1 == THREAD); 1119 } 1120 } 1121 ; 1122 1123 align_as: /* See alignment-specifier in C11 6.7.5 */ 1124 typespec 1125 | constant_expr 1126 ; 1127 1128 param_list: 1129 id_list_lparen identifier_list T_RPAREN { 1130 $$ = $2; 1131 } 1132 | abstract_decl_param_list 1133 ; 1134 1135 id_list_lparen: 1136 T_LPAREN { 1137 block_level++; 1138 begin_declaration_level(PROTO_ARG); 1139 } 1140 ; 1141 1142 identifier_list: 1143 T_NAME { 1144 $$ = old_style_function_name(getsym($1)); 1145 } 1146 | identifier_list T_COMMA T_NAME { 1147 $$ = lnklst($1, old_style_function_name(getsym($3))); 1148 } 1149 | identifier_list error 1150 ; 1151 1152 abstract_decl_param_list: 1153 abstract_decl_lparen T_RPAREN type_attribute_opt { 1154 $$ = NULL; 1155 } 1156 | abstract_decl_lparen vararg_parameter_type_list T_RPAREN type_attribute_opt { 1157 dcs->d_proto = true; 1158 $$ = $2; 1159 } 1160 | abstract_decl_lparen error T_RPAREN type_attribute_opt { 1161 $$ = NULL; 1162 } 1163 ; 1164 1165 abstract_decl_lparen: 1166 T_LPAREN { 1167 block_level++; 1168 begin_declaration_level(PROTO_ARG); 1169 } 1170 ; 1171 1172 vararg_parameter_type_list: 1173 parameter_type_list 1174 | parameter_type_list T_COMMA T_ELLIPSIS { 1175 dcs->d_vararg = true; 1176 $$ = $1; 1177 } 1178 | T_ELLIPSIS { 1179 if (sflag) { 1180 /* ANSI C requires formal parameter before '...' */ 1181 error(84); 1182 } else if (!tflag) { 1183 /* ANSI C requires formal parameter before '...' */ 1184 warning(84); 1185 } 1186 dcs->d_vararg = true; 1187 $$ = NULL; 1188 } 1189 ; 1190 1191 parameter_type_list: 1192 parameter_declaration 1193 | parameter_type_list T_COMMA parameter_declaration { 1194 $$ = lnklst($1, $3); 1195 } 1196 ; 1197 1198 /* XXX: C99 6.7.5 defines the same name, but it looks completely different. */ 1199 parameter_declaration: 1200 declmods deftyp { 1201 $$ = declare_argument(abstract_name(), false); 1202 } 1203 | declaration_specifiers deftyp { 1204 $$ = declare_argument(abstract_name(), false); 1205 } 1206 | declmods deftyp notype_param_decl { 1207 $$ = declare_argument($3, false); 1208 } 1209 | declaration_specifiers deftyp type_param_decl { 1210 $$ = declare_argument($3, false); 1211 } 1212 | declmods deftyp abstract_declarator { 1213 $$ = declare_argument($3, false); 1214 } 1215 | declaration_specifiers deftyp abstract_declarator { 1216 $$ = declare_argument($3, false); 1217 } 1218 ; 1219 1220 asm_or_symbolrename_opt: /* expect only one */ 1221 /* empty */ { 1222 $$ = NULL; 1223 } 1224 | T_ASM T_LPAREN T_STRING T_RPAREN { 1225 freeyyv(&$3, T_STRING); 1226 $$ = NULL; 1227 } 1228 | T_SYMBOLRENAME T_LPAREN T_NAME T_RPAREN { 1229 $$ = $3; 1230 } 1231 ; 1232 1233 initializer: /* C99 6.7.8 "Initialization" */ 1234 expr %prec T_COMMA { 1235 init_expr($1); 1236 } 1237 | init_lbrace init_rbrace { 1238 /* XXX: Empty braces are not covered by C99 6.7.8. */ 1239 } 1240 | init_lbrace initializer_list comma_opt init_rbrace 1241 | error 1242 ; 1243 1244 initializer_list: /* C99 6.7.8 "Initialization" */ 1245 initializer_list_item 1246 | initializer_list T_COMMA initializer_list_item 1247 ; 1248 1249 initializer_list_item: 1250 designation initializer 1251 | initializer 1252 ; 1253 1254 designation: /* C99 6.7.8 "Initialization" */ 1255 designator_list T_ASSIGN 1256 | identifier T_COLON { 1257 /* GCC style struct or union member name in initializer */ 1258 gnuism(315); 1259 add_designator_member($1); 1260 } 1261 ; 1262 1263 designator_list: /* C99 6.7.8 "Initialization" */ 1264 designator 1265 | designator_list designator 1266 ; 1267 1268 designator: /* C99 6.7.8 "Initialization" */ 1269 T_LBRACK range T_RBRACK { 1270 add_designator_subscript($2); 1271 if (!Sflag) 1272 /* array initializer with des.s is a C9X feature */ 1273 warning(321); 1274 } 1275 | T_POINT identifier { 1276 if (!Sflag) 1277 /* struct or union member name in initializer is ... */ 1278 warning(313); 1279 add_designator_member($2); 1280 } 1281 ; 1282 1283 range: 1284 constant_expr { 1285 $$.lo = to_int_constant($1, true); 1286 $$.hi = $$.lo; 1287 } 1288 | constant_expr T_ELLIPSIS constant_expr { 1289 $$.lo = to_int_constant($1, true); 1290 $$.hi = to_int_constant($3, true); 1291 /* initialization with '[a...b]' is a GCC extension */ 1292 gnuism(340); 1293 } 1294 ; 1295 1296 init_lbrace: 1297 T_LBRACE { 1298 init_lbrace(); 1299 } 1300 ; 1301 1302 init_rbrace: 1303 T_RBRACE { 1304 init_rbrace(); 1305 } 1306 ; 1307 1308 type_name: /* C99 6.7.6 */ 1309 { 1310 begin_declaration_level(ABSTRACT); 1311 } abstract_declaration { 1312 end_declaration_level(); 1313 $$ = $2->s_type; 1314 } 1315 ; 1316 1317 abstract_declaration: 1318 noclass_declmods deftyp { 1319 $$ = declare_1_abstract(abstract_name()); 1320 } 1321 | noclass_declspecs deftyp { 1322 $$ = declare_1_abstract(abstract_name()); 1323 } 1324 | noclass_declmods deftyp abstract_declarator { 1325 $$ = declare_1_abstract($3); 1326 } 1327 | noclass_declspecs deftyp abstract_declarator { 1328 $$ = declare_1_abstract($3); 1329 } 1330 ; 1331 1332 abstract_declarator: /* C99 6.7.6 */ 1333 pointer { 1334 $$ = add_pointer(abstract_name(), $1); 1335 } 1336 | direct_abstract_declarator 1337 | pointer direct_abstract_declarator { 1338 $$ = add_pointer($2, $1); 1339 } 1340 | T_TYPEOF term { /* GCC extension */ 1341 $$ = mktempsym($2->tn_type); 1342 } 1343 ; 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 expr_statement 1406 | non_expr_statement 1407 ; 1408 1409 labeled_statement: /* C99 6.8.1 */ 1410 label type_attribute_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 compound_statement_rbrace 1435 | compound_statement_lbrace block_item_list 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: 1457 block_item 1458 | block_item_list block_item { 1459 if (!Sflag && $1 && !$2) 1460 /* declarations after statements is a C99 feature */ 1461 c99ism(327); 1462 $$ = $1 || $2; 1463 } 1464 ; 1465 1466 block_item: 1467 statement { 1468 $$ = true; 1469 restore_warning_flags(); 1470 } 1471 | declaration { 1472 $$ = false; 1473 restore_warning_flags(); 1474 } 1475 ; 1476 1477 expr_statement: 1478 expr T_SEMI { 1479 expr($1, false, false, false, false); 1480 seen_fallthrough = false; 1481 } 1482 | T_SEMI { 1483 seen_fallthrough = false; 1484 } 1485 ; 1486 1487 selection_statement: /* C99 6.8.4 */ 1488 if_without_else { 1489 save_warning_flags(); 1490 if2(); 1491 if3(false); 1492 } 1493 | if_without_else T_ELSE { 1494 save_warning_flags(); 1495 if2(); 1496 } statement { 1497 clear_warning_flags(); 1498 if3(true); 1499 } 1500 | if_without_else T_ELSE error { 1501 clear_warning_flags(); 1502 if3(false); 1503 } 1504 | switch_expr statement { 1505 clear_warning_flags(); 1506 switch2(); 1507 } 1508 | switch_expr error { 1509 clear_warning_flags(); 1510 switch2(); 1511 } 1512 ; 1513 1514 if_without_else: 1515 if_expr statement 1516 | if_expr error 1517 ; 1518 1519 if_expr: 1520 T_IF T_LPAREN expr T_RPAREN { 1521 if1($3); 1522 clear_warning_flags(); 1523 } 1524 ; 1525 1526 switch_expr: 1527 T_SWITCH T_LPAREN expr T_RPAREN { 1528 switch1($3); 1529 clear_warning_flags(); 1530 } 1531 ; 1532 1533 generic_selection: /* C11 6.5.1.1 */ 1534 T_GENERIC T_LPAREN assignment_expression T_COMMA 1535 generic_assoc_list T_RPAREN { 1536 /* generic selection requires C11 or later */ 1537 c11ism(345); 1538 $$ = build_generic_selection($3, $5); 1539 } 1540 ; 1541 1542 generic_assoc_list: /* C11 6.5.1.1 */ 1543 generic_association 1544 | generic_assoc_list T_COMMA generic_association { 1545 $3->ga_prev = $1; 1546 $$ = $3; 1547 } 1548 ; 1549 1550 generic_association: /* C11 6.5.1.1 */ 1551 type_name T_COLON assignment_expression { 1552 $$ = getblk(sizeof(*$$)); 1553 $$->ga_arg = $1; 1554 $$->ga_result = $3; 1555 } 1556 | T_DEFAULT T_COLON assignment_expression { 1557 $$ = getblk(sizeof(*$$)); 1558 $$->ga_arg = NULL; 1559 $$->ga_result = $3; 1560 } 1561 ; 1562 1563 do_statement: /* C99 6.8.5 */ 1564 do statement { 1565 clear_warning_flags(); 1566 } 1567 ; 1568 1569 iteration_statement: /* C99 6.8.5 */ 1570 while_expr statement { 1571 clear_warning_flags(); 1572 while2(); 1573 } 1574 | while_expr error { 1575 clear_warning_flags(); 1576 while2(); 1577 } 1578 | do_statement do_while_expr { 1579 do2($2); 1580 seen_fallthrough = false; 1581 } 1582 | do error { 1583 clear_warning_flags(); 1584 do2(NULL); 1585 } 1586 | for_exprs statement { 1587 clear_warning_flags(); 1588 for2(); 1589 end_declaration_level(); 1590 block_level--; 1591 } 1592 | for_exprs error { 1593 clear_warning_flags(); 1594 for2(); 1595 end_declaration_level(); 1596 block_level--; 1597 } 1598 ; 1599 1600 while_expr: 1601 T_WHILE T_LPAREN expr T_RPAREN { 1602 while1($3); 1603 clear_warning_flags(); 1604 } 1605 ; 1606 1607 do: 1608 T_DO { 1609 do1(); 1610 } 1611 ; 1612 1613 do_while_expr: 1614 T_WHILE T_LPAREN expr T_RPAREN T_SEMI { 1615 $$ = $3; 1616 } 1617 ; 1618 1619 for_start: 1620 T_FOR T_LPAREN { 1621 begin_declaration_level(AUTO); 1622 block_level++; 1623 } 1624 ; 1625 1626 for_exprs: 1627 for_start declaration_specifiers deftyp notype_init_decls T_SEMI 1628 expr_opt T_SEMI expr_opt T_RPAREN { 1629 /* variable declaration in for loop */ 1630 c99ism(325); 1631 for1(NULL, $6, $8); 1632 clear_warning_flags(); 1633 } 1634 | for_start expr_opt T_SEMI expr_opt T_SEMI expr_opt T_RPAREN { 1635 for1($2, $4, $6); 1636 clear_warning_flags(); 1637 } 1638 ; 1639 1640 expr_opt: 1641 /* empty */ { 1642 $$ = NULL; 1643 } 1644 | expr 1645 ; 1646 1647 jump_statement: /* C99 6.8.6 */ 1648 goto identifier T_SEMI { 1649 do_goto(getsym($2)); 1650 } 1651 | goto error T_SEMI { 1652 symtyp = FVFT; 1653 } 1654 | T_CONTINUE T_SEMI { 1655 do_continue(); 1656 } 1657 | T_BREAK T_SEMI { 1658 do_break(); 1659 } 1660 | T_RETURN T_SEMI { 1661 do_return(NULL); 1662 } 1663 | T_RETURN expr T_SEMI { 1664 do_return($2); 1665 } 1666 ; 1667 1668 goto: 1669 T_GOTO { 1670 symtyp = FLABEL; 1671 } 1672 ; 1673 1674 asm_statement: 1675 T_ASM T_LPAREN read_until_rparen T_SEMI { 1676 setasm(); 1677 } 1678 | T_ASM T_QUAL T_LPAREN read_until_rparen T_SEMI { 1679 setasm(); 1680 } 1681 | T_ASM error 1682 ; 1683 1684 read_until_rparen: 1685 /* empty */ { 1686 ignore_up_to_rparen(); 1687 } 1688 ; 1689 1690 constant_expr_list_opt: 1691 /* empty */ 1692 | constant_expr_list 1693 ; 1694 1695 constant_expr_list: 1696 constant_expr 1697 | constant_expr_list T_COMMA constant_expr 1698 ; 1699 1700 constant_expr: /* C99 6.6 */ 1701 expr %prec T_ASSIGN 1702 ; 1703 1704 expr: 1705 expr T_ASTERISK expr { 1706 $$ = build(MULT, $1, $3); 1707 } 1708 | expr T_MULTIPLICATIVE expr { 1709 $$ = build($2, $1, $3); 1710 } 1711 | expr T_ADDITIVE expr { 1712 $$ = build($2, $1, $3); 1713 } 1714 | expr T_SHIFT expr { 1715 $$ = build($2, $1, $3); 1716 } 1717 | expr T_RELATIONAL expr { 1718 $$ = build($2, $1, $3); 1719 } 1720 | expr T_EQUALITY expr { 1721 $$ = build($2, $1, $3); 1722 } 1723 | expr T_AMPER expr { 1724 $$ = build(BITAND, $1, $3); 1725 } 1726 | expr T_BITXOR expr { 1727 $$ = build(BITXOR, $1, $3); 1728 } 1729 | expr T_BITOR expr { 1730 $$ = build(BITOR, $1, $3); 1731 } 1732 | expr T_LOGAND expr { 1733 $$ = build(LOGAND, $1, $3); 1734 } 1735 | expr T_LOGOR expr { 1736 $$ = build(LOGOR, $1, $3); 1737 } 1738 | expr T_QUEST expr T_COLON expr { 1739 $$ = build(QUEST, $1, build(COLON, $3, $5)); 1740 } 1741 | expr T_ASSIGN expr { 1742 $$ = build(ASSIGN, $1, $3); 1743 } 1744 | expr T_OPASSIGN expr { 1745 $$ = build($2, $1, $3); 1746 } 1747 | expr T_COMMA expr { 1748 $$ = build(COMMA, $1, $3); 1749 } 1750 | term 1751 | generic_selection 1752 ; 1753 1754 assignment_expression: /* C99 6.5.16 */ 1755 expr %prec T_ASSIGN 1756 ; 1757 1758 term: 1759 T_NAME { 1760 /* XXX really necessary? */ 1761 if (yychar < 0) 1762 yychar = yylex(); 1763 $$ = new_name_node(getsym($1), yychar); 1764 } 1765 | string { 1766 $$ = new_string_node($1); 1767 } 1768 | T_CON { 1769 $$ = expr_new_constant(gettyp($1->v_tspec), $1); 1770 } 1771 | T_LPAREN expr T_RPAREN { 1772 if ($2 != NULL) 1773 $2->tn_parenthesized = true; 1774 $$ = $2; 1775 } 1776 | T_LPAREN compound_statement_lbrace gcc_statement_expr_list { 1777 block_level--; 1778 mem_block_level--; 1779 begin_initialization(mktempsym(dup_type($3->tn_type))); 1780 mem_block_level++; 1781 block_level++; 1782 /* ({ }) is a GCC extension */ 1783 gnuism(320); 1784 } compound_statement_rbrace T_RPAREN { 1785 $$ = new_name_node(*current_initsym(), 0); 1786 end_initialization(); 1787 } 1788 | term T_INCDEC { 1789 $$ = build($2 == INC ? INCAFT : DECAFT, $1, NULL); 1790 } 1791 | T_INCDEC term { 1792 $$ = build($1 == INC ? INCBEF : DECBEF, $2, NULL); 1793 } 1794 | T_ASTERISK term { 1795 $$ = build(INDIR, $2, NULL); 1796 } 1797 | T_AMPER term { 1798 $$ = build(ADDR, $2, NULL); 1799 } 1800 | T_UNARY term { 1801 $$ = build($1, $2, NULL); 1802 } 1803 | T_ADDITIVE term { 1804 if (tflag && $1 == PLUS) { 1805 /* unary + is illegal in traditional C */ 1806 warning(100); 1807 } 1808 $$ = build($1 == PLUS ? UPLUS : UMINUS, $2, NULL); 1809 } 1810 | term T_LBRACK expr T_RBRACK { 1811 $$ = build(INDIR, build(PLUS, $1, $3), NULL); 1812 } 1813 | term T_LPAREN T_RPAREN { 1814 $$ = new_function_call_node($1, NULL); 1815 } 1816 | term T_LPAREN func_arg_list T_RPAREN { 1817 $$ = new_function_call_node($1, $3); 1818 } 1819 | term point_or_arrow T_NAME { 1820 if ($1 != NULL) { 1821 sym_t *msym; 1822 /* 1823 * XXX struct_or_union_member should be integrated 1824 * in build() 1825 */ 1826 if ($2 == ARROW) { 1827 /* 1828 * must do this before struct_or_union_member 1829 * is called 1830 */ 1831 $1 = cconv($1); 1832 } 1833 msym = struct_or_union_member($1, $2, getsym($3)); 1834 $$ = build($2, $1, new_name_node(msym, 0)); 1835 } else { 1836 $$ = NULL; 1837 } 1838 } 1839 | T_REAL term { 1840 $$ = build(REAL, $2, NULL); 1841 } 1842 | T_IMAG term { 1843 $$ = build(IMAG, $2, NULL); 1844 } 1845 | T_EXTENSION term { 1846 $$ = $2; 1847 } 1848 | T_REAL T_LPAREN term T_RPAREN { 1849 $$ = build(REAL, $3, NULL); 1850 } 1851 | T_IMAG T_LPAREN term T_RPAREN { 1852 $$ = build(IMAG, $3, NULL); 1853 } 1854 | T_BUILTIN_OFFSETOF T_LPAREN type_name T_COMMA identifier T_RPAREN { 1855 symtyp = FMEMBER; 1856 $$ = build_offsetof($3, getsym($5)); 1857 } 1858 | T_SIZEOF term { 1859 $$ = $2 == NULL ? NULL : build_sizeof($2->tn_type); 1860 if ($$ != NULL) 1861 check_expr_misc($2, false, false, false, false, false, true); 1862 } 1863 | T_SIZEOF T_LPAREN type_name T_RPAREN %prec T_SIZEOF { 1864 $$ = build_sizeof($3); 1865 } 1866 | T_ALIGNOF T_LPAREN type_name T_RPAREN { 1867 $$ = build_alignof($3); 1868 } 1869 | T_LPAREN type_name T_RPAREN term %prec T_UNARY { 1870 $$ = cast($4, $2); 1871 } 1872 | T_LPAREN type_name T_RPAREN { /* C99 6.5.2.5 "Compound literals" */ 1873 sym_t *tmp = mktempsym($2); 1874 begin_initialization(tmp); 1875 cgram_declare(tmp, true, NULL); 1876 } init_lbrace initializer_list comma_opt init_rbrace { 1877 if (!Sflag) 1878 /* compound literals are a C9X/GCC extension */ 1879 gnuism(319); 1880 $$ = new_name_node(*current_initsym(), 0); 1881 end_initialization(); 1882 } 1883 ; 1884 1885 /* 1886 * The inner part of a GCC statement-expression of the form ({ ... }). 1887 * 1888 * https://gcc.gnu.org/onlinedocs/gcc/Statement-Exprs.html 1889 */ 1890 gcc_statement_expr_list: 1891 gcc_statement_expr_item 1892 | gcc_statement_expr_list gcc_statement_expr_item { 1893 $$ = $2; 1894 } 1895 ; 1896 1897 gcc_statement_expr_item: 1898 declaration { 1899 clear_warning_flags(); 1900 $$ = NULL; 1901 } 1902 | non_expr_statement { 1903 $$ = expr_zalloc_tnode(); 1904 $$->tn_type = gettyp(VOID); 1905 } 1906 | expr T_SEMI { 1907 if ($1 == NULL) { /* in case of syntax errors */ 1908 $$ = expr_zalloc_tnode(); 1909 $$->tn_type = gettyp(VOID); 1910 } else { 1911 /* XXX: do that only on the last name */ 1912 if ($1->tn_op == NAME) 1913 $1->tn_sym->s_used = true; 1914 $$ = $1; 1915 expr($1, false, false, false, false); 1916 seen_fallthrough = false; 1917 } 1918 } 1919 ; 1920 1921 string: 1922 T_STRING 1923 | T_STRING string2 { 1924 $$ = cat_strings($1, $2); 1925 } 1926 ; 1927 1928 string2: 1929 T_STRING { 1930 if (tflag) { 1931 /* concatenated strings are illegal in traditional C */ 1932 warning(219); 1933 } 1934 $$ = $1; 1935 } 1936 | string2 T_STRING { 1937 $$ = cat_strings($1, $2); 1938 } 1939 ; 1940 1941 func_arg_list: 1942 expr %prec T_COMMA { 1943 $$ = new_function_argument_node(NULL, $1); 1944 } 1945 | func_arg_list T_COMMA expr { 1946 $$ = new_function_argument_node($1, $3); 1947 } 1948 ; 1949 1950 point_or_arrow: 1951 T_POINT { 1952 symtyp = FMEMBER; 1953 $$ = POINT; 1954 } 1955 | T_ARROW { 1956 symtyp = FMEMBER; 1957 $$ = ARROW; 1958 } 1959 ; 1960 1961 identifier: /* C99 6.4.2.1 */ 1962 T_NAME { 1963 $$ = $1; 1964 cgram_debug("name '%s'", $$->sb_name); 1965 } 1966 | T_TYPENAME { 1967 $$ = $1; 1968 cgram_debug("typename '%s'", $$->sb_name); 1969 } 1970 ; 1971 1972 comma_opt: 1973 /* empty */ 1974 | T_COMMA 1975 ; 1976 1977 /* GCC extensions */ 1978 1979 /* TODO: split into type_attribute and gcc_attribute */ 1980 1981 type_attribute_list: 1982 type_attribute 1983 | type_attribute_list type_attribute 1984 ; 1985 1986 type_attribute: 1987 T_ATTRIBUTE T_LPAREN T_LPAREN { 1988 attron = true; 1989 } type_attribute_spec_list { 1990 attron = false; 1991 } T_RPAREN T_RPAREN 1992 | T_ALIGNAS T_LPAREN align_as T_RPAREN { 1993 } 1994 | T_PACKED { 1995 addpacked(); 1996 } 1997 | T_NORETURN { 1998 } 1999 ; 2000 2001 /* https://gcc.gnu.org/onlinedocs/gcc/Attribute-Syntax.html */ 2002 type_attribute_spec_list: 2003 type_attribute_spec 2004 | type_attribute_spec_list T_COMMA type_attribute_spec 2005 ; 2006 2007 type_attribute_spec: 2008 /* empty */ 2009 | T_AT_ALWAYS_INLINE 2010 | T_AT_ALIAS T_LPAREN string T_RPAREN 2011 | T_AT_ALIGNED T_LPAREN constant_expr T_RPAREN 2012 | T_AT_ALIGNED 2013 | T_AT_ALLOC_SIZE T_LPAREN constant_expr T_COMMA constant_expr T_RPAREN 2014 | T_AT_ALLOC_SIZE T_LPAREN constant_expr T_RPAREN 2015 | T_AT_BOUNDED T_LPAREN type_attribute_bounded_type 2016 T_COMMA constant_expr T_COMMA constant_expr T_RPAREN 2017 | T_AT_COLD 2018 | T_AT_COMMON 2019 | T_AT_CONSTRUCTOR T_LPAREN constant_expr T_RPAREN 2020 | T_AT_CONSTRUCTOR 2021 | T_AT_DEPRECATED T_LPAREN string T_RPAREN 2022 | T_AT_DEPRECATED 2023 | T_AT_DESTRUCTOR T_LPAREN constant_expr T_RPAREN 2024 | T_AT_DESTRUCTOR 2025 | T_AT_FALLTHROUGH { 2026 fallthru(1); 2027 } 2028 | T_AT_FORMAT T_LPAREN type_attribute_format_type T_COMMA 2029 constant_expr T_COMMA constant_expr T_RPAREN 2030 | T_AT_FORMAT_ARG T_LPAREN constant_expr T_RPAREN 2031 | T_AT_GNU_INLINE 2032 | T_AT_MALLOC 2033 | T_AT_MAY_ALIAS 2034 | T_AT_MODE T_LPAREN T_NAME T_RPAREN 2035 | T_AT_NOINLINE 2036 | T_AT_NONNULL T_LPAREN constant_expr_list_opt T_RPAREN 2037 | T_AT_NONNULL 2038 | T_AT_NONSTRING 2039 | T_AT_NORETURN 2040 | T_AT_NOTHROW 2041 | T_AT_NO_INSTRUMENT_FUNCTION 2042 | T_AT_OPTIMIZE T_LPAREN string T_RPAREN 2043 | T_AT_PACKED { 2044 addpacked(); 2045 } 2046 | T_AT_PCS T_LPAREN string T_RPAREN 2047 | T_AT_PURE 2048 | T_AT_RETURNS_TWICE 2049 | T_AT_SECTION T_LPAREN string T_RPAREN 2050 | T_AT_SENTINEL T_LPAREN constant_expr T_RPAREN 2051 | T_AT_SENTINEL 2052 | T_AT_TLS_MODEL T_LPAREN string T_RPAREN 2053 | T_AT_TUNION 2054 | T_AT_UNUSED { 2055 add_attr_used(); 2056 } 2057 | T_AT_USED { 2058 add_attr_used(); 2059 } 2060 | T_AT_VISIBILITY T_LPAREN constant_expr T_RPAREN 2061 | T_AT_WARN_UNUSED_RESULT 2062 | T_AT_WEAK 2063 | T_QUAL { 2064 if ($1 != CONST) 2065 yyerror("Bad attribute"); 2066 } 2067 ; 2068 2069 type_attribute_bounded_type: 2070 T_AT_MINBYTES 2071 | T_AT_STRING 2072 | T_AT_BUFFER 2073 ; 2074 2075 type_attribute_format_type: 2076 T_AT_FORMAT_GNU_PRINTF 2077 | T_AT_FORMAT_PRINTF 2078 | T_AT_FORMAT_SCANF 2079 | T_AT_FORMAT_STRFMON 2080 | T_AT_FORMAT_STRFTIME 2081 | T_AT_FORMAT_SYSLOG 2082 ; 2083 2084 %% 2085 2086 /* ARGSUSED */ 2087 int 2088 yyerror(const char *msg) 2089 { 2090 /* syntax error '%s' */ 2091 error(249, yytext); 2092 if (++sytxerr >= 5) 2093 norecover(); 2094 return 0; 2095 } 2096 2097 static void 2098 cgram_declare(sym_t *decl, bool initflg, sbuf_t *renaming) 2099 { 2100 declare(decl, initflg, renaming); 2101 if (renaming != NULL) 2102 freeyyv(&renaming, T_NAME); 2103 } 2104 2105 /* 2106 * Discard all input tokens up to and including the next 2107 * unmatched right paren 2108 */ 2109 static void 2110 ignore_up_to_rparen(void) 2111 { 2112 int level; 2113 2114 if (yychar < 0) 2115 yychar = yylex(); 2116 freeyyv(&yylval, yychar); 2117 2118 level = 1; 2119 while (yychar != T_RPAREN || --level > 0) { 2120 if (yychar == T_LPAREN) { 2121 level++; 2122 } else if (yychar <= 0) { 2123 break; 2124 } 2125 freeyyv(&yylval, yychar = yylex()); 2126 } 2127 2128 yyclearin; 2129 } 2130 2131 static sym_t * 2132 symbolrename(sym_t *s, sbuf_t *sb) 2133 { 2134 if (sb != NULL) 2135 s->s_rename = sb->sb_name; 2136 return s; 2137 } 2138
Indexes created Thu Oct 02 14:10:14 GMT 2025