cgram.y revision 1.240
1 %{ 2 /* $NetBSD: cgram.y,v 1.240 2021/06/27 21:46:17 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 1.240 2021/06/27 21:46:17 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 182 127 128 %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 pqinf_t *y_pqinf; 141 bool y_seen_statement; 142 struct generic_association_types *y_types; 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> enums_with_opt_comma 304 %type <y_sym> enums 305 %type <y_sym> enumerator 306 %type <y_sym> enumeration_constant 307 %type <y_sym> notype_direct_decl 308 %type <y_sym> type_direct_decl 309 %type <y_pqinf> pointer 310 %type <y_pqinf> asterisk 311 %type <y_sym> param_decl 312 %type <y_sym> param_list 313 %type <y_sym> abstract_decl_param_list 314 %type <y_sym> direct_param_decl 315 %type <y_sym> notype_param_decl 316 %type <y_sym> direct_notype_param_decl 317 %type <y_pqinf> type_qualifier_list 318 %type <y_pqinf> type_qualifier 319 %type <y_sym> identifier_list 320 %type <y_sym> abstract_decl 321 %type <y_sym> direct_abstract_decl 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> opt_expr 337 %type <y_string> string 338 %type <y_string> string2 339 %type <y_sb> opt_asm_or_symbolrename 340 %type <y_range> range 341 %type <y_seen_statement> block_item_list 342 %type <y_seen_statement> block_item 343 %type <y_types> generic_assoc_list 344 %type <y_types> 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 type_attribute_format_type: 542 T_AT_FORMAT_GNU_PRINTF 543 | T_AT_FORMAT_PRINTF 544 | T_AT_FORMAT_SCANF 545 | T_AT_FORMAT_STRFMON 546 | T_AT_FORMAT_STRFTIME 547 | T_AT_FORMAT_SYSLOG 548 ; 549 550 type_attribute_bounded_type: 551 T_AT_MINBYTES 552 | T_AT_STRING 553 | T_AT_BUFFER 554 ; 555 556 557 type_attribute_spec: 558 /* empty */ 559 | T_AT_ALWAYS_INLINE 560 | T_AT_ALIAS T_LPAREN string T_RPAREN 561 | T_AT_ALIGNED T_LPAREN constant_expr T_RPAREN 562 | T_AT_ALIGNED 563 | T_AT_ALLOC_SIZE T_LPAREN constant_expr T_COMMA constant_expr T_RPAREN 564 | T_AT_ALLOC_SIZE T_LPAREN constant_expr T_RPAREN 565 | T_AT_BOUNDED T_LPAREN type_attribute_bounded_type 566 T_COMMA constant_expr T_COMMA constant_expr T_RPAREN 567 | T_AT_COLD 568 | T_AT_COMMON 569 | T_AT_CONSTRUCTOR T_LPAREN constant_expr T_RPAREN 570 | T_AT_CONSTRUCTOR 571 | T_AT_DEPRECATED T_LPAREN string T_RPAREN 572 | T_AT_DEPRECATED 573 | T_AT_DESTRUCTOR T_LPAREN constant_expr T_RPAREN 574 | T_AT_DESTRUCTOR 575 | T_AT_FALLTHROUGH { 576 fallthru(1); 577 } 578 | T_AT_FORMAT T_LPAREN type_attribute_format_type T_COMMA 579 constant_expr T_COMMA constant_expr T_RPAREN 580 | T_AT_FORMAT_ARG T_LPAREN constant_expr T_RPAREN 581 | T_AT_GNU_INLINE 582 | T_AT_MALLOC 583 | T_AT_MAY_ALIAS 584 | T_AT_MODE T_LPAREN T_NAME T_RPAREN 585 | T_AT_NOINLINE 586 | T_AT_NONNULL T_LPAREN constant_expr_list_opt T_RPAREN 587 | T_AT_NONNULL 588 | T_AT_NONSTRING 589 | T_AT_NORETURN 590 | T_AT_NOTHROW 591 | T_AT_NO_INSTRUMENT_FUNCTION 592 | T_AT_OPTIMIZE T_LPAREN string T_RPAREN 593 | T_AT_PACKED { 594 addpacked(); 595 } 596 | T_AT_PCS T_LPAREN string T_RPAREN 597 | T_AT_PURE 598 | T_AT_RETURNS_TWICE 599 | T_AT_SECTION T_LPAREN string T_RPAREN 600 | T_AT_SENTINEL T_LPAREN constant_expr T_RPAREN 601 | T_AT_SENTINEL 602 | T_AT_TLS_MODEL T_LPAREN string T_RPAREN 603 | T_AT_TUNION 604 | T_AT_UNUSED { 605 add_attr_used(); 606 } 607 | T_AT_USED { 608 add_attr_used(); 609 } 610 | T_AT_VISIBILITY T_LPAREN constant_expr T_RPAREN 611 | T_AT_WARN_UNUSED_RESULT 612 | T_AT_WEAK 613 | T_QUAL { 614 if ($1 != CONST) 615 yyerror("Bad attribute"); 616 } 617 ; 618 619 type_attribute_spec_list: 620 type_attribute_spec 621 | type_attribute_spec_list T_COMMA type_attribute_spec 622 ; 623 624 align_as: 625 typespec 626 | constant_expr 627 ; 628 629 type_attribute: 630 T_ATTRIBUTE T_LPAREN T_LPAREN { 631 attron = true; 632 } type_attribute_spec_list { 633 attron = false; 634 } T_RPAREN T_RPAREN 635 | T_ALIGNAS T_LPAREN align_as T_RPAREN { 636 } 637 | T_PACKED { 638 addpacked(); 639 } 640 | T_NORETURN { 641 } 642 ; 643 644 type_attribute_list: 645 type_attribute 646 | type_attribute_list type_attribute 647 ; 648 649 clrtyp: 650 /* empty */ { 651 clrtyp(); 652 } 653 ; 654 655 deftyp: 656 /* empty */ { 657 deftyp(); 658 } 659 ; 660 661 declaration_specifiers: /* C99 6.7 */ 662 clrtyp_typespec { 663 add_type($1); 664 } 665 | declmods typespec { 666 add_type($2); 667 } 668 | type_attribute declaration_specifiers 669 | declaration_specifiers declmod 670 | declaration_specifiers notype_typespec { 671 add_type($2); 672 } 673 ; 674 675 declmods: 676 clrtyp T_QUAL { 677 add_qualifier($2); 678 } 679 | clrtyp T_SCLASS { 680 add_storage_class($2); 681 } 682 | declmods declmod 683 ; 684 685 declmod: 686 T_QUAL { 687 add_qualifier($1); 688 } 689 | T_SCLASS { 690 add_storage_class($1); 691 } 692 | type_attribute_list 693 ; 694 695 clrtyp_typespec: 696 clrtyp notype_typespec { 697 $$ = $2; 698 } 699 | T_TYPENAME clrtyp { 700 $$ = getsym($1)->s_type; 701 } 702 ; 703 704 typespec: 705 notype_typespec 706 | T_TYPENAME { 707 $$ = getsym($1)->s_type; 708 } 709 ; 710 711 notype_typespec: 712 T_TYPE { 713 $$ = gettyp($1); 714 } 715 | T_TYPEOF term { 716 $$ = $2->tn_type; 717 } 718 | struct_spec { 719 end_declaration_level(); 720 $$ = $1; 721 } 722 | enum_spec { 723 end_declaration_level(); 724 $$ = $1; 725 } 726 ; 727 728 struct_spec: 729 struct struct_tag { 730 /* 731 * STDC requires that "struct a;" always introduces 732 * a new tag if "a" is not declared at current level 733 * 734 * yychar is valid because otherwise the parser would not 735 * have been able to decide if it must shift or reduce 736 */ 737 $$ = mktag($2, $1, false, yychar == T_SEMI); 738 } 739 | struct struct_tag { 740 dcs->d_tagtyp = mktag($2, $1, true, false); 741 } struct_declaration { 742 $$ = complete_tag_struct_or_union(dcs->d_tagtyp, $4); 743 } 744 | struct { 745 dcs->d_tagtyp = mktag(NULL, $1, true, false); 746 } struct_declaration { 747 $$ = complete_tag_struct_or_union(dcs->d_tagtyp, $3); 748 } 749 | struct error { 750 symtyp = FVFT; 751 $$ = gettyp(INT); 752 } 753 ; 754 755 struct: 756 struct type_attribute 757 | T_STRUCT_OR_UNION { 758 symtyp = FTAG; 759 begin_declaration_level($1 == STRUCT ? MOS : MOU); 760 dcs->d_offset = 0; 761 dcs->d_stralign = CHAR_SIZE; 762 $$ = $1; 763 } 764 ; 765 766 struct_tag: 767 identifier { 768 $$ = getsym($1); 769 } 770 ; 771 772 struct_declaration: 773 struct_decl_lbrace member_declaration_list_with_rbrace { 774 $$ = $2; 775 } 776 ; 777 778 struct_decl_lbrace: 779 T_LBRACE { 780 symtyp = FVFT; 781 } 782 ; 783 784 member_declaration_list_with_rbrace: 785 member_declaration_list T_SEMI T_RBRACE 786 | member_declaration_list T_RBRACE { 787 if (sflag) { 788 /* syntax req. ';' after last struct/union member */ 789 error(66); 790 } else { 791 /* syntax req. ';' after last struct/union member */ 792 warning(66); 793 } 794 $$ = $1; 795 } 796 | T_RBRACE { 797 $$ = NULL; 798 } 799 ; 800 801 opt_type_attribute: 802 /* empty */ 803 | type_attribute 804 ; 805 806 member_declaration_list: 807 member_declaration 808 | member_declaration_list T_SEMI member_declaration { 809 $$ = lnklst($1, $3); 810 } 811 ; 812 813 member_declaration: 814 noclass_declmods deftyp { 815 /* too late, i know, but getsym() compensates it */ 816 symtyp = FMEMBER; 817 } notype_member_decls opt_type_attribute { 818 symtyp = FVFT; 819 $$ = $4; 820 } 821 | noclass_declspecs deftyp { 822 symtyp = FMEMBER; 823 } type_member_decls opt_type_attribute { 824 symtyp = FVFT; 825 $$ = $4; 826 } 827 | noclass_declmods deftyp opt_type_attribute { 828 symtyp = FVFT; 829 /* struct or union member must be named */ 830 if (!Sflag) 831 /* anonymous struct/union members is a C9X feature */ 832 warning(49); 833 /* add all the members of the anonymous struct/union */ 834 $$ = dcs->d_type->t_str->sou_first_member; 835 anonymize($$); 836 } 837 | noclass_declspecs deftyp opt_type_attribute { 838 symtyp = FVFT; 839 /* struct or union member must be named */ 840 if (!Sflag) 841 /* anonymous struct/union members is a C9X feature */ 842 warning(49); 843 if (is_struct_or_union(dcs->d_type->t_tspec)) { 844 $$ = dcs->d_type->t_str->sou_first_member; 845 /* add all the members of the anonymous struct/union */ 846 anonymize($$); 847 } else { 848 /* syntax error '%s' */ 849 error(249, "unnamed member"); 850 $$ = NULL; 851 } 852 } 853 | error { 854 symtyp = FVFT; 855 $$ = NULL; 856 } 857 ; 858 859 noclass_declspecs: 860 clrtyp_typespec { 861 add_type($1); 862 } 863 | type_attribute noclass_declspecs 864 | noclass_declmods typespec { 865 add_type($2); 866 } 867 | noclass_declspecs T_QUAL { 868 add_qualifier($2); 869 } 870 | noclass_declspecs notype_typespec { 871 add_type($2); 872 } 873 | noclass_declspecs type_attribute 874 ; 875 876 noclass_declmods: 877 clrtyp T_QUAL { 878 add_qualifier($2); 879 } 880 | noclass_declmods T_QUAL { 881 add_qualifier($2); 882 } 883 ; 884 885 notype_member_decls: 886 notype_member_decl { 887 $$ = declarator_1_struct_union($1); 888 } 889 | notype_member_decls { 890 symtyp = FMEMBER; 891 } T_COMMA type_member_decl { 892 $$ = lnklst($1, declarator_1_struct_union($4)); 893 } 894 ; 895 896 type_member_decls: 897 type_member_decl { 898 $$ = declarator_1_struct_union($1); 899 } 900 | type_member_decls { 901 symtyp = FMEMBER; 902 } T_COMMA type_member_decl { 903 $$ = lnklst($1, declarator_1_struct_union($4)); 904 } 905 ; 906 907 notype_member_decl: 908 notype_decl 909 | notype_decl T_COLON constant_expr { /* C99 6.7.2.1 */ 910 $$ = bitfield($1, to_int_constant($3, true)); 911 } 912 | { 913 symtyp = FVFT; 914 } T_COLON constant_expr { /* C99 6.7.2.1 */ 915 $$ = bitfield(NULL, to_int_constant($3, true)); 916 } 917 ; 918 919 type_member_decl: 920 type_decl 921 | type_decl T_COLON constant_expr { 922 $$ = bitfield($1, to_int_constant($3, true)); 923 } 924 | { 925 symtyp = FVFT; 926 } T_COLON constant_expr { 927 $$ = bitfield(NULL, to_int_constant($3, true)); 928 } 929 ; 930 931 enum_spec: 932 enum enum_tag { 933 $$ = mktag($2, ENUM, false, false); 934 } 935 | enum enum_tag { 936 dcs->d_tagtyp = mktag($2, ENUM, true, false); 937 } enum_declaration { 938 $$ = complete_tag_enum(dcs->d_tagtyp, $4); 939 } 940 | enum { 941 dcs->d_tagtyp = mktag(NULL, ENUM, true, false); 942 } enum_declaration { 943 $$ = complete_tag_enum(dcs->d_tagtyp, $3); 944 } 945 | enum error { 946 symtyp = FVFT; 947 $$ = gettyp(INT); 948 } 949 ; 950 951 enum: 952 T_ENUM { 953 symtyp = FTAG; 954 begin_declaration_level(CTCONST); 955 } 956 ; 957 958 enum_tag: 959 identifier { 960 $$ = getsym($1); 961 } 962 ; 963 964 enum_declaration: 965 enum_decl_lbrace enums_with_opt_comma T_RBRACE { 966 $$ = $2; 967 } 968 ; 969 970 enum_decl_lbrace: 971 T_LBRACE { 972 symtyp = FVFT; 973 enumval = 0; 974 } 975 ; 976 977 enums_with_opt_comma: 978 enums 979 | enums T_COMMA { 980 if (sflag) { 981 /* trailing ',' prohibited in enum declaration */ 982 error(54); 983 } else { 984 /* trailing ',' prohibited in enum declaration */ 985 c99ism(54); 986 } 987 $$ = $1; 988 } 989 ; 990 991 enums: 992 enumerator 993 | enums T_COMMA enumerator { 994 $$ = lnklst($1, $3); 995 } 996 | error { 997 $$ = NULL; 998 } 999 ; 1000 1001 enumerator: 1002 enumeration_constant { 1003 $$ = enumeration_constant($1, enumval, true); 1004 } 1005 | enumeration_constant T_ASSIGN constant_expr { 1006 $$ = enumeration_constant($1, to_int_constant($3, true), false); 1007 } 1008 ; 1009 1010 enumeration_constant: /* C99 6.4.4.3 */ 1011 identifier { 1012 $$ = getsym($1); 1013 } 1014 ; 1015 1016 1017 notype_init_decls: 1018 notype_init_decl 1019 | notype_init_decls T_COMMA type_init_decl 1020 ; 1021 1022 type_init_decls: 1023 type_init_decl 1024 | type_init_decls T_COMMA type_init_decl 1025 ; 1026 1027 notype_init_decl: 1028 notype_decl opt_asm_or_symbolrename { 1029 cgram_declare($1, false, $2); 1030 check_size($1); 1031 } 1032 | notype_decl opt_asm_or_symbolrename { 1033 begin_initialization($1); 1034 cgram_declare($1, true, $2); 1035 } T_ASSIGN initializer { 1036 check_size($1); 1037 end_initialization(); 1038 } 1039 ; 1040 1041 type_init_decl: 1042 type_decl opt_asm_or_symbolrename { 1043 cgram_declare($1, false, $2); 1044 check_size($1); 1045 } 1046 | type_decl opt_asm_or_symbolrename { 1047 begin_initialization($1); 1048 cgram_declare($1, true, $2); 1049 } T_ASSIGN initializer { 1050 check_size($1); 1051 end_initialization(); 1052 } 1053 ; 1054 1055 notype_decl: 1056 notype_direct_decl 1057 | pointer notype_direct_decl { 1058 $$ = add_pointer($2, $1); 1059 } 1060 ; 1061 1062 type_decl: 1063 type_direct_decl 1064 | pointer type_direct_decl { 1065 $$ = add_pointer($2, $1); 1066 } 1067 ; 1068 1069 notype_direct_decl: 1070 T_NAME { 1071 $$ = declarator_name(getsym($1)); 1072 } 1073 | T_LPAREN type_decl T_RPAREN { 1074 $$ = $2; 1075 } 1076 | type_attribute notype_direct_decl { 1077 $$ = $2; 1078 } 1079 | notype_direct_decl T_LBRACK T_RBRACK { 1080 $$ = add_array($1, false, 0); 1081 } 1082 | notype_direct_decl T_LBRACK array_size T_RBRACK { 1083 $$ = add_array($1, true, to_int_constant($3, false)); 1084 } 1085 | notype_direct_decl param_list opt_asm_or_symbolrename { 1086 $$ = add_function(symbolrename($1, $3), $2); 1087 end_declaration_level(); 1088 block_level--; 1089 } 1090 | notype_direct_decl type_attribute_list 1091 ; 1092 1093 /* 1094 * TODO: document whether the subtle difference between 'identifier' here and 1095 * 'T_NAME' in notype_direct_decl above is on purpose. 1096 */ 1097 type_direct_decl: 1098 identifier { 1099 $$ = declarator_name(getsym($1)); 1100 } 1101 | T_LPAREN type_decl T_RPAREN { 1102 $$ = $2; 1103 } 1104 | type_attribute type_direct_decl { 1105 $$ = $2; 1106 } 1107 | type_direct_decl T_LBRACK T_RBRACK { 1108 $$ = add_array($1, false, 0); 1109 } 1110 | type_direct_decl T_LBRACK array_size T_RBRACK { 1111 $$ = add_array($1, true, to_int_constant($3, false)); 1112 } 1113 | type_direct_decl param_list opt_asm_or_symbolrename { 1114 $$ = add_function(symbolrename($1, $3), $2); 1115 end_declaration_level(); 1116 block_level--; 1117 } 1118 | type_direct_decl type_attribute_list 1119 ; 1120 1121 /* 1122 * param_decl and notype_param_decl exist to avoid a conflict in 1123 * argument lists. A typename enclosed in parens should always be 1124 * treated as a typename, not an argument. 1125 * "typedef int a; f(int (a));" is "typedef int a; f(int foo(a));" 1126 * not "typedef int a; f(int a);" 1127 */ 1128 param_decl: 1129 direct_param_decl 1130 | pointer direct_param_decl { 1131 $$ = add_pointer($2, $1); 1132 } 1133 ; 1134 1135 /* TODO: consistently use 'opt' either as prefix or as suffix */ 1136 opt_type_qualifier_list: 1137 /* empty */ 1138 | type_qualifier_list 1139 ; 1140 1141 array_size: 1142 opt_type_qualifier_list T_SCLASS constant_expr { 1143 /* C11 6.7.6.3p7 */ 1144 if ($2 != STATIC) 1145 yyerror("Bad attribute"); 1146 /* static array size is a C11 extension */ 1147 c11ism(343); 1148 $$ = $3; 1149 } 1150 | constant_expr 1151 ; 1152 1153 direct_param_decl: 1154 identifier type_attribute_list { 1155 $$ = declarator_name(getsym($1)); 1156 } 1157 | identifier { 1158 $$ = declarator_name(getsym($1)); 1159 } 1160 | T_LPAREN notype_param_decl T_RPAREN { 1161 $$ = $2; 1162 } 1163 | direct_param_decl T_LBRACK T_RBRACK { 1164 $$ = add_array($1, false, 0); 1165 } 1166 | direct_param_decl T_LBRACK array_size T_RBRACK { 1167 $$ = add_array($1, true, to_int_constant($3, false)); 1168 } 1169 | direct_param_decl param_list opt_asm_or_symbolrename { 1170 $$ = add_function(symbolrename($1, $3), $2); 1171 end_declaration_level(); 1172 block_level--; 1173 } 1174 ; 1175 1176 notype_param_decl: 1177 direct_notype_param_decl 1178 | pointer direct_notype_param_decl { 1179 $$ = add_pointer($2, $1); 1180 } 1181 ; 1182 1183 direct_notype_param_decl: 1184 identifier { 1185 $$ = declarator_name(getsym($1)); 1186 } 1187 | T_LPAREN notype_param_decl T_RPAREN { 1188 $$ = $2; 1189 } 1190 | direct_notype_param_decl T_LBRACK T_RBRACK { 1191 $$ = add_array($1, false, 0); 1192 } 1193 | direct_notype_param_decl T_LBRACK array_size T_RBRACK { 1194 $$ = add_array($1, true, to_int_constant($3, false)); 1195 } 1196 | direct_notype_param_decl param_list opt_asm_or_symbolrename { 1197 $$ = add_function(symbolrename($1, $3), $2); 1198 end_declaration_level(); 1199 block_level--; 1200 } 1201 ; 1202 1203 /* TODO: rename 'pointer' to something less ambiguous, maybe 'pointer_level' */ 1204 pointer: 1205 asterisk 1206 | asterisk type_qualifier_list { 1207 /* TODO: rename pqinf_t to be more expressive */ 1208 /* TODO: then rename the merge function */ 1209 $$ = merge_pointers_and_qualifiers($1, $2); 1210 } 1211 | asterisk pointer { 1212 $$ = merge_pointers_and_qualifiers($1, $2); 1213 } 1214 | asterisk type_qualifier_list pointer { 1215 $$ = merge_pointers_and_qualifiers($1, $2); 1216 $$ = merge_pointers_and_qualifiers($$, $3); 1217 } 1218 ; 1219 1220 asterisk: 1221 T_ASTERISK { 1222 $$ = xcalloc(1, sizeof(*$$)); 1223 $$->p_pointer = true; 1224 } 1225 ; 1226 1227 /* TODO: try whether type_qualifier_list_opt makes the code simpler */ 1228 type_qualifier_list: 1229 type_qualifier 1230 | type_qualifier_list type_qualifier { 1231 $$ = merge_pointers_and_qualifiers($1, $2); 1232 } 1233 ; 1234 1235 type_qualifier: 1236 T_QUAL { 1237 $$ = xcalloc(1, sizeof(*$$)); 1238 if ($1 == CONST) { 1239 $$->p_const = true; 1240 } else if ($1 == VOLATILE) { 1241 $$->p_volatile = true; 1242 } else { 1243 lint_assert($1 == RESTRICT || $1 == THREAD); 1244 } 1245 } 1246 ; 1247 1248 param_list: 1249 id_list_lparen identifier_list T_RPAREN { 1250 $$ = $2; 1251 } 1252 | abstract_decl_param_list 1253 ; 1254 1255 id_list_lparen: 1256 T_LPAREN { 1257 block_level++; 1258 begin_declaration_level(PROTO_ARG); 1259 } 1260 ; 1261 1262 identifier_list: 1263 T_NAME { 1264 $$ = old_style_function_name(getsym($1)); 1265 } 1266 | identifier_list T_COMMA T_NAME { 1267 $$ = lnklst($1, old_style_function_name(getsym($3))); 1268 } 1269 | identifier_list error 1270 ; 1271 1272 abstract_decl_param_list: 1273 abstract_decl_lparen T_RPAREN opt_type_attribute { 1274 $$ = NULL; 1275 } 1276 | abstract_decl_lparen vararg_parameter_type_list T_RPAREN opt_type_attribute { 1277 dcs->d_proto = true; 1278 $$ = $2; 1279 } 1280 | abstract_decl_lparen error T_RPAREN opt_type_attribute { 1281 $$ = NULL; 1282 } 1283 ; 1284 1285 abstract_decl_lparen: 1286 T_LPAREN { 1287 block_level++; 1288 begin_declaration_level(PROTO_ARG); 1289 } 1290 ; 1291 1292 vararg_parameter_type_list: 1293 parameter_type_list 1294 | parameter_type_list T_COMMA T_ELLIPSIS { 1295 dcs->d_vararg = true; 1296 $$ = $1; 1297 } 1298 | T_ELLIPSIS { 1299 if (sflag) { 1300 /* ANSI C requires formal parameter before '...' */ 1301 error(84); 1302 } else if (!tflag) { 1303 /* ANSI C requires formal parameter before '...' */ 1304 warning(84); 1305 } 1306 dcs->d_vararg = true; 1307 $$ = NULL; 1308 } 1309 ; 1310 1311 parameter_type_list: 1312 parameter_declaration 1313 | parameter_type_list T_COMMA parameter_declaration { 1314 $$ = lnklst($1, $3); 1315 } 1316 ; 1317 1318 parameter_declaration: 1319 declmods deftyp { 1320 $$ = declare_argument(abstract_name(), false); 1321 } 1322 | declaration_specifiers deftyp { 1323 $$ = declare_argument(abstract_name(), false); 1324 } 1325 | declmods deftyp notype_param_decl { 1326 $$ = declare_argument($3, false); 1327 } 1328 /* 1329 * param_decl is needed because of following conflict: 1330 * "typedef int a; f(int (a));" could be parsed as 1331 * "function with argument a of type int", or 1332 * "function with an abstract argument of type function". 1333 * This grammar realizes the second case. 1334 */ 1335 | declaration_specifiers deftyp param_decl { 1336 $$ = declare_argument($3, false); 1337 } 1338 | declmods deftyp abstract_decl { 1339 $$ = declare_argument($3, false); 1340 } 1341 | declaration_specifiers deftyp abstract_decl { 1342 $$ = declare_argument($3, false); 1343 } 1344 ; 1345 1346 opt_asm_or_symbolrename: /* expect only one */ 1347 /* empty */ { 1348 $$ = NULL; 1349 } 1350 | T_ASM T_LPAREN T_STRING T_RPAREN { 1351 freeyyv(&$3, T_STRING); 1352 $$ = NULL; 1353 } 1354 | T_SYMBOLRENAME T_LPAREN T_NAME T_RPAREN { 1355 $$ = $3; 1356 } 1357 ; 1358 1359 initializer: /* C99 6.7.8 "Initialization" */ 1360 expr %prec T_COMMA { 1361 init_expr($1); 1362 } 1363 | init_lbrace init_rbrace { 1364 /* XXX: Empty braces are not covered by C99 6.7.8. */ 1365 } 1366 | init_lbrace initializer_list comma_opt init_rbrace 1367 | error 1368 ; 1369 1370 initializer_list: /* C99 6.7.8 "Initialization" */ 1371 initializer_list_item 1372 | initializer_list T_COMMA initializer_list_item 1373 ; 1374 1375 initializer_list_item: 1376 designation initializer 1377 | initializer 1378 ; 1379 1380 designation: /* C99 6.7.8 "Initialization" */ 1381 designator_list T_ASSIGN 1382 | identifier T_COLON { 1383 /* GCC style struct or union member name in initializer */ 1384 gnuism(315); 1385 add_designator_member($1); 1386 } 1387 ; 1388 1389 designator_list: /* C99 6.7.8 "Initialization" */ 1390 designator 1391 | designator_list designator 1392 ; 1393 1394 designator: /* C99 6.7.8 "Initialization" */ 1395 T_LBRACK range T_RBRACK { 1396 add_designator_subscript($2); 1397 if (!Sflag) 1398 /* array initializer with des.s is a C9X feature */ 1399 warning(321); 1400 } 1401 | T_POINT identifier { 1402 if (!Sflag) 1403 /* struct or union member name in initializer is ... */ 1404 warning(313); 1405 add_designator_member($2); 1406 } 1407 ; 1408 1409 range: 1410 constant_expr { 1411 $$.lo = to_int_constant($1, true); 1412 $$.hi = $$.lo; 1413 } 1414 | constant_expr T_ELLIPSIS constant_expr { 1415 $$.lo = to_int_constant($1, true); 1416 $$.hi = to_int_constant($3, true); 1417 /* initialization with '[a...b]' is a GNU extension */ 1418 gnuism(340); 1419 } 1420 ; 1421 1422 init_lbrace: 1423 T_LBRACE { 1424 init_lbrace(); 1425 } 1426 ; 1427 1428 init_rbrace: 1429 T_RBRACE { 1430 init_rbrace(); 1431 } 1432 ; 1433 1434 type_name: 1435 { 1436 begin_declaration_level(ABSTRACT); 1437 } abstract_declaration { 1438 end_declaration_level(); 1439 $$ = $2->s_type; 1440 } 1441 ; 1442 1443 abstract_declaration: 1444 noclass_declmods deftyp { 1445 $$ = declare_1_abstract(abstract_name()); 1446 } 1447 | noclass_declspecs deftyp { 1448 $$ = declare_1_abstract(abstract_name()); 1449 } 1450 | noclass_declmods deftyp abstract_decl { 1451 $$ = declare_1_abstract($3); 1452 } 1453 | noclass_declspecs deftyp abstract_decl { 1454 $$ = declare_1_abstract($3); 1455 } 1456 ; 1457 1458 /* TODO: abstract_declaration and abstract_decl sound too similar */ 1459 abstract_decl: 1460 pointer { 1461 $$ = add_pointer(abstract_name(), $1); 1462 } 1463 | direct_abstract_decl 1464 | pointer direct_abstract_decl { 1465 $$ = add_pointer($2, $1); 1466 } 1467 | T_TYPEOF term { 1468 $$ = mktempsym($2->tn_type); 1469 } 1470 ; 1471 1472 direct_abstract_decl: 1473 T_LPAREN abstract_decl T_RPAREN { 1474 $$ = $2; 1475 } 1476 | T_LBRACK T_RBRACK { 1477 $$ = add_array(abstract_name(), false, 0); 1478 } 1479 | T_LBRACK array_size T_RBRACK { 1480 $$ = add_array(abstract_name(), true, to_int_constant($2, false)); 1481 } 1482 | type_attribute direct_abstract_decl { 1483 $$ = $2; 1484 } 1485 | direct_abstract_decl T_LBRACK T_RBRACK { 1486 $$ = add_array($1, false, 0); 1487 } 1488 | direct_abstract_decl T_LBRACK array_size T_RBRACK { 1489 $$ = add_array($1, true, to_int_constant($3, false)); 1490 } 1491 | abstract_decl_param_list opt_asm_or_symbolrename { 1492 $$ = add_function(symbolrename(abstract_name(), $2), $1); 1493 end_declaration_level(); 1494 block_level--; 1495 } 1496 | direct_abstract_decl abstract_decl_param_list opt_asm_or_symbolrename { 1497 $$ = add_function(symbolrename($1, $3), $2); 1498 end_declaration_level(); 1499 block_level--; 1500 } 1501 | direct_abstract_decl type_attribute_list 1502 ; 1503 1504 non_expr_statement: 1505 type_attribute T_SEMI 1506 | labeled_statement 1507 | compound_statement 1508 | selection_statement 1509 | iteration_statement 1510 | jump_statement { 1511 seen_fallthrough = false; 1512 } 1513 | asm_statement 1514 ; 1515 1516 statement: /* C99 6.8 */ 1517 expr_statement 1518 | non_expr_statement 1519 ; 1520 1521 labeled_statement: /* C99 6.8.1 */ 1522 label opt_type_attribute statement 1523 ; 1524 1525 label: 1526 T_NAME T_COLON { 1527 symtyp = FLABEL; 1528 named_label(getsym($1)); 1529 } 1530 | T_CASE constant_expr T_COLON { 1531 case_label($2); 1532 seen_fallthrough = true; 1533 } 1534 | T_CASE constant_expr T_ELLIPSIS constant_expr T_COLON { 1535 /* XXX: We don't fill all cases */ 1536 case_label($2); 1537 seen_fallthrough = true; 1538 } 1539 | T_DEFAULT T_COLON { 1540 default_label(); 1541 seen_fallthrough = true; 1542 } 1543 ; 1544 1545 compound_statement: /* C99 6.8.2 */ 1546 compound_statement_lbrace compound_statement_rbrace 1547 | compound_statement_lbrace block_item_list compound_statement_rbrace 1548 ; 1549 1550 compound_statement_lbrace: 1551 T_LBRACE { 1552 block_level++; 1553 mem_block_level++; 1554 begin_declaration_level(AUTO); 1555 } 1556 ; 1557 1558 compound_statement_rbrace: 1559 T_RBRACE { 1560 end_declaration_level(); 1561 freeblk(); 1562 mem_block_level--; 1563 block_level--; 1564 seen_fallthrough = false; 1565 } 1566 ; 1567 1568 block_item_list: 1569 block_item 1570 | block_item_list block_item { 1571 if (!Sflag && $1 && !$2) 1572 /* declarations after statements is a C99 feature */ 1573 c99ism(327); 1574 $$ = $1 || $2; 1575 } 1576 ; 1577 1578 block_item: 1579 statement { 1580 $$ = true; 1581 restore_warning_flags(); 1582 } 1583 | declaration { 1584 $$ = false; 1585 restore_warning_flags(); 1586 } 1587 ; 1588 1589 expr_statement: 1590 expr T_SEMI { 1591 expr($1, false, false, false, false); 1592 seen_fallthrough = false; 1593 } 1594 | T_SEMI { 1595 seen_fallthrough = false; 1596 } 1597 ; 1598 1599 selection_statement: /* C99 6.8.4 */ 1600 if_without_else { 1601 save_warning_flags(); 1602 if2(); 1603 if3(false); 1604 } 1605 | if_without_else T_ELSE { 1606 save_warning_flags(); 1607 if2(); 1608 } statement { 1609 clear_warning_flags(); 1610 if3(true); 1611 } 1612 | if_without_else T_ELSE error { 1613 clear_warning_flags(); 1614 if3(false); 1615 } 1616 | switch_expr statement { 1617 clear_warning_flags(); 1618 switch2(); 1619 } 1620 | switch_expr error { 1621 clear_warning_flags(); 1622 switch2(); 1623 } 1624 ; 1625 1626 if_without_else: 1627 if_expr statement 1628 | if_expr error 1629 ; 1630 1631 if_expr: 1632 T_IF T_LPAREN expr T_RPAREN { 1633 if1($3); 1634 clear_warning_flags(); 1635 } 1636 ; 1637 1638 switch_expr: 1639 T_SWITCH T_LPAREN expr T_RPAREN { 1640 switch1($3); 1641 clear_warning_flags(); 1642 } 1643 ; 1644 1645 generic_selection: /* C11 6.5.1.1 */ 1646 T_GENERIC T_LPAREN assignment_expression T_COMMA 1647 generic_assoc_list T_RPAREN { 1648 /* generic selection requires C11 or later */ 1649 c11ism(345); 1650 $$ = build_generic_selection($3, $5); 1651 } 1652 ; 1653 1654 generic_assoc_list: /* C11 6.5.1.1 */ 1655 generic_association 1656 | generic_assoc_list T_COMMA generic_association { 1657 $3->gat_prev = $1; 1658 $$ = $3; 1659 } 1660 ; 1661 1662 generic_association: /* C11 6.5.1.1 */ 1663 type_name T_COLON expr { 1664 $$ = getblk(sizeof(*$$)); 1665 $$->gat_arg = $1; 1666 $$->gat_result = $3; 1667 } 1668 | T_DEFAULT T_COLON expr { 1669 $$ = getblk(sizeof(*$$)); 1670 $$->gat_arg = NULL; 1671 $$->gat_result = $3; 1672 } 1673 ; 1674 1675 do_statement: /* C99 6.8.5 */ 1676 do statement { 1677 clear_warning_flags(); 1678 } 1679 ; 1680 1681 iteration_statement: /* C99 6.8.5 */ 1682 while_expr statement { 1683 clear_warning_flags(); 1684 while2(); 1685 } 1686 | while_expr error { 1687 clear_warning_flags(); 1688 while2(); 1689 } 1690 | do_statement do_while_expr { 1691 do2($2); 1692 seen_fallthrough = false; 1693 } 1694 | do error { 1695 clear_warning_flags(); 1696 do2(NULL); 1697 } 1698 | for_exprs statement { 1699 clear_warning_flags(); 1700 for2(); 1701 end_declaration_level(); 1702 block_level--; 1703 } 1704 | for_exprs error { 1705 clear_warning_flags(); 1706 for2(); 1707 end_declaration_level(); 1708 block_level--; 1709 } 1710 ; 1711 1712 while_expr: 1713 T_WHILE T_LPAREN expr T_RPAREN { 1714 while1($3); 1715 clear_warning_flags(); 1716 } 1717 ; 1718 1719 do: 1720 T_DO { 1721 do1(); 1722 } 1723 ; 1724 1725 do_while_expr: 1726 T_WHILE T_LPAREN expr T_RPAREN T_SEMI { 1727 $$ = $3; 1728 } 1729 ; 1730 1731 for_start: 1732 T_FOR T_LPAREN { 1733 begin_declaration_level(AUTO); 1734 block_level++; 1735 } 1736 ; 1737 for_exprs: 1738 for_start declaration_specifiers deftyp notype_init_decls T_SEMI 1739 opt_expr T_SEMI opt_expr T_RPAREN { 1740 /* variable declaration in for loop */ 1741 c99ism(325); 1742 for1(NULL, $6, $8); 1743 clear_warning_flags(); 1744 } 1745 | for_start opt_expr T_SEMI opt_expr T_SEMI opt_expr T_RPAREN { 1746 for1($2, $4, $6); 1747 clear_warning_flags(); 1748 } 1749 ; 1750 1751 opt_expr: 1752 /* empty */ { 1753 $$ = NULL; 1754 } 1755 | expr 1756 ; 1757 1758 jump_statement: /* C99 6.8.6 */ 1759 goto identifier T_SEMI { 1760 do_goto(getsym($2)); 1761 } 1762 | goto error T_SEMI { 1763 symtyp = FVFT; 1764 } 1765 | T_CONTINUE T_SEMI { 1766 do_continue(); 1767 } 1768 | T_BREAK T_SEMI { 1769 do_break(); 1770 } 1771 | T_RETURN T_SEMI { 1772 do_return(NULL); 1773 } 1774 | T_RETURN expr T_SEMI { 1775 do_return($2); 1776 } 1777 ; 1778 1779 goto: 1780 T_GOTO { 1781 symtyp = FLABEL; 1782 } 1783 ; 1784 1785 asm_statement: 1786 T_ASM T_LPAREN read_until_rparen T_SEMI { 1787 setasm(); 1788 } 1789 | T_ASM T_QUAL T_LPAREN read_until_rparen T_SEMI { 1790 setasm(); 1791 } 1792 | T_ASM error 1793 ; 1794 1795 read_until_rparen: 1796 /* empty */ { 1797 ignore_up_to_rparen(); 1798 } 1799 ; 1800 1801 constant_expr_list_opt: 1802 /* empty */ 1803 | constant_expr_list 1804 ; 1805 1806 constant_expr_list: 1807 constant_expr 1808 | constant_expr_list T_COMMA constant_expr 1809 ; 1810 1811 constant_expr: /* C99 6.6 */ 1812 expr %prec T_ASSIGN 1813 ; 1814 1815 expr: 1816 expr T_ASTERISK expr { 1817 $$ = build(MULT, $1, $3); 1818 } 1819 | expr T_MULTIPLICATIVE expr { 1820 $$ = build($2, $1, $3); 1821 } 1822 | expr T_ADDITIVE expr { 1823 $$ = build($2, $1, $3); 1824 } 1825 | expr T_SHIFT expr { 1826 $$ = build($2, $1, $3); 1827 } 1828 | expr T_RELATIONAL expr { 1829 $$ = build($2, $1, $3); 1830 } 1831 | expr T_EQUALITY expr { 1832 $$ = build($2, $1, $3); 1833 } 1834 | expr T_AMPER expr { 1835 $$ = build(BITAND, $1, $3); 1836 } 1837 | expr T_BITXOR expr { 1838 $$ = build(BITXOR, $1, $3); 1839 } 1840 | expr T_BITOR expr { 1841 $$ = build(BITOR, $1, $3); 1842 } 1843 | expr T_LOGAND expr { 1844 $$ = build(LOGAND, $1, $3); 1845 } 1846 | expr T_LOGOR expr { 1847 $$ = build(LOGOR, $1, $3); 1848 } 1849 | expr T_QUEST expr T_COLON expr { 1850 $$ = build(QUEST, $1, build(COLON, $3, $5)); 1851 } 1852 | expr T_ASSIGN expr { 1853 $$ = build(ASSIGN, $1, $3); 1854 } 1855 | expr T_OPASSIGN expr { 1856 $$ = build($2, $1, $3); 1857 } 1858 | expr T_COMMA expr { 1859 $$ = build(COMMA, $1, $3); 1860 } 1861 | term 1862 | generic_selection 1863 ; 1864 1865 assignment_expression: /* C99 6.5.16 */ 1866 expr %prec T_ASSIGN 1867 ; 1868 1869 term: 1870 T_NAME { 1871 /* XXX really necessary? */ 1872 if (yychar < 0) 1873 yychar = yylex(); 1874 $$ = new_name_node(getsym($1), yychar); 1875 } 1876 | string { 1877 $$ = new_string_node($1); 1878 } 1879 | T_CON { 1880 $$ = expr_new_constant(gettyp($1->v_tspec), $1); 1881 } 1882 | T_LPAREN expr T_RPAREN { 1883 if ($2 != NULL) 1884 $2->tn_parenthesized = true; 1885 $$ = $2; 1886 } 1887 | T_LPAREN compound_statement_lbrace gcc_statement_expr_list { 1888 block_level--; 1889 mem_block_level--; 1890 begin_initialization(mktempsym(dup_type($3->tn_type))); 1891 mem_block_level++; 1892 block_level++; 1893 /* ({ }) is a GCC extension */ 1894 gnuism(320); 1895 } compound_statement_rbrace T_RPAREN { 1896 $$ = new_name_node(*current_initsym(), 0); 1897 end_initialization(); 1898 } 1899 | term T_INCDEC { 1900 $$ = build($2 == INC ? INCAFT : DECAFT, $1, NULL); 1901 } 1902 | T_INCDEC term { 1903 $$ = build($1 == INC ? INCBEF : DECBEF, $2, NULL); 1904 } 1905 | T_ASTERISK term { 1906 $$ = build(INDIR, $2, NULL); 1907 } 1908 | T_AMPER term { 1909 $$ = build(ADDR, $2, NULL); 1910 } 1911 | T_UNARY term { 1912 $$ = build($1, $2, NULL); 1913 } 1914 | T_ADDITIVE term { 1915 if (tflag && $1 == PLUS) { 1916 /* unary + is illegal in traditional C */ 1917 warning(100); 1918 } 1919 $$ = build($1 == PLUS ? UPLUS : UMINUS, $2, NULL); 1920 } 1921 | term T_LBRACK expr T_RBRACK { 1922 $$ = build(INDIR, build(PLUS, $1, $3), NULL); 1923 } 1924 | term T_LPAREN T_RPAREN { 1925 $$ = new_function_call_node($1, NULL); 1926 } 1927 | term T_LPAREN func_arg_list T_RPAREN { 1928 $$ = new_function_call_node($1, $3); 1929 } 1930 | term point_or_arrow T_NAME { 1931 if ($1 != NULL) { 1932 sym_t *msym; 1933 /* 1934 * XXX struct_or_union_member should be integrated 1935 * in build() 1936 */ 1937 if ($2 == ARROW) { 1938 /* 1939 * must do this before struct_or_union_member 1940 * is called 1941 */ 1942 $1 = cconv($1); 1943 } 1944 msym = struct_or_union_member($1, $2, getsym($3)); 1945 $$ = build($2, $1, new_name_node(msym, 0)); 1946 } else { 1947 $$ = NULL; 1948 } 1949 } 1950 | T_REAL term { 1951 $$ = build(REAL, $2, NULL); 1952 } 1953 | T_IMAG term { 1954 $$ = build(IMAG, $2, NULL); 1955 } 1956 | T_EXTENSION term { 1957 $$ = $2; 1958 } 1959 | T_REAL T_LPAREN term T_RPAREN { 1960 $$ = build(REAL, $3, NULL); 1961 } 1962 | T_IMAG T_LPAREN term T_RPAREN { 1963 $$ = build(IMAG, $3, NULL); 1964 } 1965 | T_BUILTIN_OFFSETOF T_LPAREN type_name T_COMMA identifier T_RPAREN { 1966 symtyp = FMEMBER; 1967 $$ = build_offsetof($3, getsym($5)); 1968 } 1969 | T_SIZEOF term { 1970 $$ = $2 == NULL ? NULL : build_sizeof($2->tn_type); 1971 if ($$ != NULL) 1972 check_expr_misc($2, false, false, false, false, false, true); 1973 } 1974 | T_SIZEOF T_LPAREN type_name T_RPAREN %prec T_SIZEOF { 1975 $$ = build_sizeof($3); 1976 } 1977 | T_ALIGNOF T_LPAREN type_name T_RPAREN { 1978 $$ = build_alignof($3); 1979 } 1980 | T_LPAREN type_name T_RPAREN term %prec T_UNARY { 1981 $$ = cast($4, $2); 1982 } 1983 | T_LPAREN type_name T_RPAREN { /* C99 6.5.2.5 "Compound literals" */ 1984 sym_t *tmp = mktempsym($2); 1985 begin_initialization(tmp); 1986 cgram_declare(tmp, true, NULL); 1987 } init_lbrace initializer_list comma_opt init_rbrace { 1988 if (!Sflag) 1989 /* compound literals are a C9X/GCC extension */ 1990 gnuism(319); 1991 $$ = new_name_node(*current_initsym(), 0); 1992 end_initialization(); 1993 } 1994 ; 1995 1996 /* 1997 * The inner part of a GCC statement-expression of the form ({ ... }). 1998 * 1999 * https://gcc.gnu.org/onlinedocs/gcc/Statement-Exprs.html 2000 */ 2001 gcc_statement_expr_list: 2002 gcc_statement_expr_item 2003 | gcc_statement_expr_list gcc_statement_expr_item { 2004 $$ = $2; 2005 } 2006 ; 2007 2008 gcc_statement_expr_item: 2009 declaration { 2010 clear_warning_flags(); 2011 $$ = NULL; 2012 } 2013 | non_expr_statement { 2014 $$ = expr_zalloc_tnode(); 2015 $$->tn_type = gettyp(VOID); 2016 } 2017 | expr T_SEMI { 2018 if ($1 == NULL) { /* in case of syntax errors */ 2019 $$ = expr_zalloc_tnode(); 2020 $$->tn_type = gettyp(VOID); 2021 } else { 2022 /* XXX: do that only on the last name */ 2023 if ($1->tn_op == NAME) 2024 $1->tn_sym->s_used = true; 2025 $$ = $1; 2026 expr($1, false, false, false, false); 2027 seen_fallthrough = false; 2028 } 2029 } 2030 ; 2031 2032 string: 2033 T_STRING 2034 | T_STRING string2 { 2035 $$ = cat_strings($1, $2); 2036 } 2037 ; 2038 2039 string2: 2040 T_STRING { 2041 if (tflag) { 2042 /* concatenated strings are illegal in traditional C */ 2043 warning(219); 2044 } 2045 $$ = $1; 2046 } 2047 | string2 T_STRING { 2048 $$ = cat_strings($1, $2); 2049 } 2050 ; 2051 2052 func_arg_list: 2053 expr %prec T_COMMA { 2054 $$ = new_function_argument_node(NULL, $1); 2055 } 2056 | func_arg_list T_COMMA expr { 2057 $$ = new_function_argument_node($1, $3); 2058 } 2059 ; 2060 2061 point_or_arrow: 2062 T_POINT { 2063 symtyp = FMEMBER; 2064 $$ = POINT; 2065 } 2066 | T_ARROW { 2067 symtyp = FMEMBER; 2068 $$ = ARROW; 2069 } 2070 ; 2071 2072 identifier: /* C99 6.4.2.1 */ 2073 T_NAME { 2074 $$ = $1; 2075 cgram_debug("name '%s'", $$->sb_name); 2076 } 2077 | T_TYPENAME { 2078 $$ = $1; 2079 cgram_debug("typename '%s'", $$->sb_name); 2080 } 2081 ; 2082 2083 comma_opt: 2084 T_COMMA 2085 | /* empty */ 2086 ; 2087 %% 2088 2089 /* ARGSUSED */ 2090 int 2091 yyerror(const char *msg) 2092 { 2093 /* syntax error '%s' */ 2094 error(249, yytext); 2095 if (++sytxerr >= 5) 2096 norecover(); 2097 return 0; 2098 } 2099 2100 static void 2101 cgram_declare(sym_t *decl, bool initflg, sbuf_t *renaming) 2102 { 2103 declare(decl, initflg, renaming); 2104 if (renaming != NULL) 2105 freeyyv(&renaming, T_NAME); 2106 } 2107 2108 /* 2109 * Discard all input tokens up to and including the next 2110 * unmatched right paren 2111 */ 2112 static void 2113 ignore_up_to_rparen(void) 2114 { 2115 int level; 2116 2117 if (yychar < 0) 2118 yychar = yylex(); 2119 freeyyv(&yylval, yychar); 2120 2121 level = 1; 2122 while (yychar != T_RPAREN || --level > 0) { 2123 if (yychar == T_LPAREN) { 2124 level++; 2125 } else if (yychar <= 0) { 2126 break; 2127 } 2128 freeyyv(&yylval, yychar = yylex()); 2129 } 2130 2131 yyclearin; 2132 } 2133 2134 static sym_t * 2135 symbolrename(sym_t *s, sbuf_t *sb) 2136 { 2137 if (sb != NULL) 2138 s->s_rename = sb->sb_name; 2139 return s; 2140 } 2141
Indexes created Fri Oct 03 02:09:57 GMT 2025