cgram.y revision 1.254
1 %{ 2 /* $NetBSD: cgram.y,v 1.254 2021/07/06 04:48:17 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 1.254 2021/07/06 04:48:17 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 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> 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_qual_ptr> pointer 310 %type <y_qual_ptr> 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_qual_ptr> type_qualifier_list_opt 318 %type <y_qual_ptr> type_qualifier_list 319 %type <y_qual_ptr> type_qualifier 320 %type <y_sym> identifier_list 321 %type <y_sym> abstract_declarator 322 %type <y_sym> direct_abstract_declarator 323 %type <y_sym> vararg_parameter_type_list 324 %type <y_sym> parameter_type_list 325 %type <y_sym> parameter_declaration 326 %type <y_tnode> expr 327 %type <y_tnode> assignment_expression 328 %type <y_tnode> gcc_statement_expr_list 329 %type <y_tnode> gcc_statement_expr_item 330 %type <y_tnode> term 331 %type <y_tnode> generic_selection 332 %type <y_tnode> func_arg_list 333 %type <y_op> point_or_arrow 334 %type <y_type> type_name 335 %type <y_sym> abstract_declaration 336 %type <y_tnode> do_while_expr 337 %type <y_tnode> expr_opt 338 %type <y_string> string 339 %type <y_string> string2 340 %type <y_sb> asm_or_symbolrename_opt 341 %type <y_range> range 342 %type <y_seen_statement> block_item_list 343 %type <y_seen_statement> block_item 344 %type <y_generic> generic_assoc_list 345 %type <y_generic> generic_association 346 347 348 %% 349 350 program: 351 /* empty */ { 352 if (sflag) { 353 /* empty translation unit */ 354 error(272); 355 } else if (!tflag) { 356 /* empty translation unit */ 357 warning(272); 358 } 359 } 360 | translation_unit 361 ; 362 363 translation_unit: /* C99 6.9 */ 364 external_declaration 365 | translation_unit external_declaration 366 ; 367 368 external_declaration: /* C99 6.9 */ 369 asm_statement 370 | function_definition { 371 global_clean_up_decl(false); 372 clear_warning_flags(); 373 } 374 | top_level_declaration { 375 global_clean_up_decl(false); 376 clear_warning_flags(); 377 } 378 ; 379 380 /* 381 * On the top level, lint allows several forms of declarations that it doesn't 382 * allow in functions. For example, a single ';' is an empty declaration and 383 * is supported by some compilers, but in a function it would be an empty 384 * statement, not a declaration. This makes a difference in C90 mode, where 385 * a statement must not be followed by a declaration. 386 * 387 * See 'declaration' for all other declarations. 388 */ 389 top_level_declaration: /* C99 6.9 calls this 'declaration' */ 390 T_SEMI { 391 if (sflag) { 392 /* empty declaration */ 393 error(0); 394 } else if (!tflag) { 395 /* empty declaration */ 396 warning(0); 397 } 398 } 399 | clrtyp deftyp notype_init_decls T_SEMI { 400 if (sflag) { 401 /* old style declaration; add 'int' */ 402 error(1); 403 } else if (!tflag) { 404 /* old style declaration; add 'int' */ 405 warning(1); 406 } 407 } 408 | declmods deftyp T_SEMI { 409 if (dcs->d_scl == TYPEDEF) { 410 /* typedef declares no type name */ 411 warning(72); 412 } else { 413 /* empty declaration */ 414 warning(2); 415 } 416 } 417 | declmods deftyp notype_init_decls T_SEMI 418 | declaration_specifiers deftyp T_SEMI { 419 if (dcs->d_scl == TYPEDEF) { 420 /* typedef declares no type name */ 421 warning(72); 422 } else if (!dcs->d_nonempty_decl) { 423 /* empty declaration */ 424 warning(2); 425 } 426 } 427 | declaration_specifiers deftyp type_init_decls T_SEMI 428 | error T_SEMI { 429 global_clean_up(); 430 } 431 | error T_RBRACE { 432 global_clean_up(); 433 } 434 ; 435 436 function_definition: /* C99 6.9.1 */ 437 func_decl { 438 if ($1->s_type->t_tspec != FUNC) { 439 /* syntax error '%s' */ 440 error(249, yytext); 441 YYERROR; 442 } 443 if ($1->s_type->t_typedef) { 444 /* ()-less function definition */ 445 error(64); 446 YYERROR; 447 } 448 funcdef($1); 449 block_level++; 450 begin_declaration_level(ARG); 451 if (lwarn == LWARN_NONE) 452 $1->s_used = true; 453 } arg_declaration_list_opt { 454 end_declaration_level(); 455 block_level--; 456 check_func_lint_directives(); 457 check_func_old_style_arguments(); 458 begin_control_statement(CS_FUNCTION_BODY); 459 } compound_statement { 460 funcend(); 461 end_control_statement(CS_FUNCTION_BODY); 462 } 463 ; 464 465 func_decl: 466 clrtyp deftyp notype_decl { 467 $$ = $3; 468 } 469 | declmods deftyp notype_decl { 470 $$ = $3; 471 } 472 | declaration_specifiers deftyp type_decl { 473 $$ = $3; 474 } 475 ; 476 477 arg_declaration_list_opt: /* C99 6.9.1p13 example 1 */ 478 /* empty */ 479 | arg_declaration_list 480 ; 481 482 arg_declaration_list: /* C99 6.9.1p13 example 1 */ 483 arg_declaration 484 | arg_declaration_list arg_declaration 485 /* XXX or better "arg_declaration error" ? */ 486 | error 487 ; 488 489 /* 490 * "arg_declaration" is separated from "declaration" because it 491 * needs other error handling. 492 */ 493 arg_declaration: 494 declmods deftyp T_SEMI { 495 /* empty declaration */ 496 warning(2); 497 } 498 | declmods deftyp notype_init_decls T_SEMI 499 | declaration_specifiers deftyp T_SEMI { 500 if (!dcs->d_nonempty_decl) { 501 /* empty declaration */ 502 warning(2); 503 } else { 504 /* '%s' declared in argument declaration list */ 505 warning(3, type_name(dcs->d_type)); 506 } 507 } 508 | declaration_specifiers deftyp type_init_decls T_SEMI { 509 if (dcs->d_nonempty_decl) { 510 /* '%s' declared in argument declaration list */ 511 warning(3, type_name(dcs->d_type)); 512 } 513 } 514 | declmods error 515 | declaration_specifiers error 516 ; 517 518 declaration: /* C99 6.7 */ 519 declmods deftyp T_SEMI { 520 if (dcs->d_scl == TYPEDEF) { 521 /* typedef declares no type name */ 522 warning(72); 523 } else { 524 /* empty declaration */ 525 warning(2); 526 } 527 } 528 | declmods deftyp notype_init_decls T_SEMI 529 | declaration_specifiers deftyp T_SEMI { 530 if (dcs->d_scl == TYPEDEF) { 531 /* typedef declares no type name */ 532 warning(72); 533 } else if (!dcs->d_nonempty_decl) { 534 /* empty declaration */ 535 warning(2); 536 } 537 } 538 | declaration_specifiers deftyp type_init_decls T_SEMI 539 | error T_SEMI 540 ; 541 542 type_attribute_format_type: 543 T_AT_FORMAT_GNU_PRINTF 544 | T_AT_FORMAT_PRINTF 545 | T_AT_FORMAT_SCANF 546 | T_AT_FORMAT_STRFMON 547 | T_AT_FORMAT_STRFTIME 548 | T_AT_FORMAT_SYSLOG 549 ; 550 551 type_attribute_bounded_type: 552 T_AT_MINBYTES 553 | T_AT_STRING 554 | T_AT_BUFFER 555 ; 556 557 558 type_attribute_spec: 559 /* empty */ 560 | T_AT_ALWAYS_INLINE 561 | T_AT_ALIAS T_LPAREN string T_RPAREN 562 | T_AT_ALIGNED T_LPAREN constant_expr T_RPAREN 563 | T_AT_ALIGNED 564 | T_AT_ALLOC_SIZE T_LPAREN constant_expr T_COMMA constant_expr T_RPAREN 565 | T_AT_ALLOC_SIZE T_LPAREN constant_expr T_RPAREN 566 | T_AT_BOUNDED T_LPAREN type_attribute_bounded_type 567 T_COMMA constant_expr T_COMMA constant_expr T_RPAREN 568 | T_AT_COLD 569 | T_AT_COMMON 570 | T_AT_CONSTRUCTOR T_LPAREN constant_expr T_RPAREN 571 | T_AT_CONSTRUCTOR 572 | T_AT_DEPRECATED T_LPAREN string T_RPAREN 573 | T_AT_DEPRECATED 574 | T_AT_DESTRUCTOR T_LPAREN constant_expr T_RPAREN 575 | T_AT_DESTRUCTOR 576 | T_AT_FALLTHROUGH { 577 fallthru(1); 578 } 579 | T_AT_FORMAT T_LPAREN type_attribute_format_type T_COMMA 580 constant_expr T_COMMA constant_expr T_RPAREN 581 | T_AT_FORMAT_ARG T_LPAREN constant_expr T_RPAREN 582 | T_AT_GNU_INLINE 583 | T_AT_MALLOC 584 | T_AT_MAY_ALIAS 585 | T_AT_MODE T_LPAREN T_NAME T_RPAREN 586 | T_AT_NOINLINE 587 | T_AT_NONNULL T_LPAREN constant_expr_list_opt T_RPAREN 588 | T_AT_NONNULL 589 | T_AT_NONSTRING 590 | T_AT_NORETURN 591 | T_AT_NOTHROW 592 | T_AT_NO_INSTRUMENT_FUNCTION 593 | T_AT_OPTIMIZE T_LPAREN string T_RPAREN 594 | T_AT_PACKED { 595 addpacked(); 596 } 597 | T_AT_PCS T_LPAREN string T_RPAREN 598 | T_AT_PURE 599 | T_AT_RETURNS_TWICE 600 | T_AT_SECTION T_LPAREN string T_RPAREN 601 | T_AT_SENTINEL T_LPAREN constant_expr T_RPAREN 602 | T_AT_SENTINEL 603 | T_AT_TLS_MODEL T_LPAREN string T_RPAREN 604 | T_AT_TUNION 605 | T_AT_UNUSED { 606 add_attr_used(); 607 } 608 | T_AT_USED { 609 add_attr_used(); 610 } 611 | T_AT_VISIBILITY T_LPAREN constant_expr T_RPAREN 612 | T_AT_WARN_UNUSED_RESULT 613 | T_AT_WEAK 614 | T_QUAL { 615 if ($1 != CONST) 616 yyerror("Bad attribute"); 617 } 618 ; 619 620 type_attribute_spec_list: 621 type_attribute_spec 622 | type_attribute_spec_list T_COMMA type_attribute_spec 623 ; 624 625 align_as: 626 typespec 627 | constant_expr 628 ; 629 630 type_attribute: 631 T_ATTRIBUTE T_LPAREN T_LPAREN { 632 attron = true; 633 } type_attribute_spec_list { 634 attron = false; 635 } T_RPAREN T_RPAREN 636 | T_ALIGNAS T_LPAREN align_as T_RPAREN { 637 } 638 | T_PACKED { 639 addpacked(); 640 } 641 | T_NORETURN { 642 } 643 ; 644 645 type_attribute_list: 646 type_attribute 647 | type_attribute_list type_attribute 648 ; 649 650 clrtyp: 651 /* empty */ { 652 clrtyp(); 653 } 654 ; 655 656 deftyp: 657 /* empty */ { 658 deftyp(); 659 } 660 ; 661 662 declaration_specifiers: /* C99 6.7 */ 663 clrtyp_typespec { 664 add_type($1); 665 } 666 | declmods typespec { 667 add_type($2); 668 } 669 | type_attribute declaration_specifiers 670 | declaration_specifiers declmod 671 | declaration_specifiers notype_typespec { 672 add_type($2); 673 } 674 ; 675 676 declmods: 677 clrtyp T_QUAL { 678 add_qualifier($2); 679 } 680 | clrtyp T_SCLASS { 681 add_storage_class($2); 682 } 683 | declmods declmod 684 ; 685 686 declmod: 687 T_QUAL { 688 add_qualifier($1); 689 } 690 | T_SCLASS { 691 add_storage_class($1); 692 } 693 | type_attribute_list 694 ; 695 696 clrtyp_typespec: 697 clrtyp notype_typespec { 698 $$ = $2; 699 } 700 | T_TYPENAME clrtyp { 701 $$ = getsym($1)->s_type; 702 } 703 ; 704 705 typespec: 706 notype_typespec 707 | T_TYPENAME { 708 $$ = getsym($1)->s_type; 709 } 710 ; 711 712 notype_typespec: 713 T_TYPE { 714 $$ = gettyp($1); 715 } 716 | T_TYPEOF term { 717 $$ = $2->tn_type; 718 } 719 | struct_spec { 720 end_declaration_level(); 721 $$ = $1; 722 } 723 | enum_spec { 724 end_declaration_level(); 725 $$ = $1; 726 } 727 ; 728 729 struct_spec: 730 struct struct_tag { 731 /* 732 * STDC requires that "struct a;" always introduces 733 * a new tag if "a" is not declared at current level 734 * 735 * yychar is valid because otherwise the parser would not 736 * have been able to decide if it must shift or reduce 737 */ 738 $$ = mktag($2, $1, false, yychar == T_SEMI); 739 } 740 | struct struct_tag { 741 dcs->d_tagtyp = mktag($2, $1, true, false); 742 } struct_declaration { 743 $$ = complete_tag_struct_or_union(dcs->d_tagtyp, $4); 744 } 745 | struct { 746 dcs->d_tagtyp = mktag(NULL, $1, true, false); 747 } struct_declaration { 748 $$ = complete_tag_struct_or_union(dcs->d_tagtyp, $3); 749 } 750 | struct error { 751 symtyp = FVFT; 752 $$ = gettyp(INT); 753 } 754 ; 755 756 struct: 757 struct type_attribute 758 | T_STRUCT_OR_UNION { 759 symtyp = FTAG; 760 begin_declaration_level($1 == STRUCT ? MOS : MOU); 761 dcs->d_offset = 0; 762 dcs->d_sou_align_in_bits = CHAR_SIZE; 763 $$ = $1; 764 } 765 ; 766 767 struct_tag: 768 identifier { 769 $$ = getsym($1); 770 } 771 ; 772 773 struct_declaration: 774 struct_decl_lbrace member_declaration_list_with_rbrace { 775 $$ = $2; 776 } 777 ; 778 779 struct_decl_lbrace: 780 T_LBRACE { 781 symtyp = FVFT; 782 } 783 ; 784 785 member_declaration_list_with_rbrace: 786 member_declaration_list T_SEMI T_RBRACE 787 | member_declaration_list T_RBRACE { 788 if (sflag) { 789 /* syntax req. ';' after last struct/union member */ 790 error(66); 791 } else { 792 /* syntax req. ';' after last struct/union member */ 793 warning(66); 794 } 795 $$ = $1; 796 } 797 | T_RBRACE { 798 $$ = NULL; 799 } 800 ; 801 802 type_attribute_opt: 803 /* empty */ 804 | type_attribute 805 ; 806 807 member_declaration_list: 808 member_declaration 809 | member_declaration_list T_SEMI member_declaration { 810 $$ = lnklst($1, $3); 811 } 812 ; 813 814 member_declaration: 815 noclass_declmods deftyp { 816 /* too late, i know, but getsym() compensates it */ 817 symtyp = FMEMBER; 818 } notype_member_decls type_attribute_opt { 819 symtyp = FVFT; 820 $$ = $4; 821 } 822 | noclass_declspecs deftyp { 823 symtyp = FMEMBER; 824 } type_member_decls type_attribute_opt { 825 symtyp = FVFT; 826 $$ = $4; 827 } 828 | noclass_declmods deftyp type_attribute_opt { 829 symtyp = FVFT; 830 /* struct or union member must be named */ 831 if (!Sflag) 832 /* anonymous struct/union members is a C9X feature */ 833 warning(49); 834 /* add all the members of the anonymous struct/union */ 835 lint_assert(is_struct_or_union(dcs->d_type->t_tspec)); 836 $$ = dcs->d_type->t_str->sou_first_member; 837 anonymize($$); 838 } 839 | noclass_declspecs deftyp type_attribute_opt { 840 symtyp = FVFT; 841 /* struct or union member must be named */ 842 if (!Sflag) 843 /* anonymous struct/union members is a C9X feature */ 844 warning(49); 845 if (is_struct_or_union(dcs->d_type->t_tspec)) { 846 $$ = dcs->d_type->t_str->sou_first_member; 847 /* add all the members of the anonymous struct/union */ 848 anonymize($$); 849 } else { 850 /* syntax error '%s' */ 851 error(249, "unnamed member"); 852 $$ = NULL; 853 } 854 } 855 | error { 856 symtyp = FVFT; 857 $$ = NULL; 858 } 859 ; 860 861 noclass_declspecs: 862 clrtyp_typespec { 863 add_type($1); 864 } 865 | type_attribute noclass_declspecs 866 | noclass_declmods typespec { 867 add_type($2); 868 } 869 | noclass_declspecs T_QUAL { 870 add_qualifier($2); 871 } 872 | noclass_declspecs notype_typespec { 873 add_type($2); 874 } 875 | noclass_declspecs type_attribute 876 ; 877 878 noclass_declmods: 879 clrtyp T_QUAL { 880 add_qualifier($2); 881 } 882 | noclass_declmods T_QUAL { 883 add_qualifier($2); 884 } 885 ; 886 887 notype_member_decls: 888 notype_member_decl { 889 $$ = declarator_1_struct_union($1); 890 } 891 | notype_member_decls { 892 symtyp = FMEMBER; 893 } T_COMMA type_member_decl { 894 $$ = lnklst($1, declarator_1_struct_union($4)); 895 } 896 ; 897 898 type_member_decls: 899 type_member_decl { 900 $$ = declarator_1_struct_union($1); 901 } 902 | type_member_decls { 903 symtyp = FMEMBER; 904 } T_COMMA type_member_decl { 905 $$ = lnklst($1, declarator_1_struct_union($4)); 906 } 907 ; 908 909 notype_member_decl: 910 notype_decl 911 | notype_decl T_COLON constant_expr { /* C99 6.7.2.1 */ 912 $$ = bitfield($1, to_int_constant($3, true)); 913 } 914 | { 915 symtyp = FVFT; 916 } T_COLON constant_expr { /* C99 6.7.2.1 */ 917 $$ = bitfield(NULL, to_int_constant($3, true)); 918 } 919 ; 920 921 type_member_decl: 922 type_decl 923 | type_decl T_COLON constant_expr { 924 $$ = bitfield($1, to_int_constant($3, true)); 925 } 926 | { 927 symtyp = FVFT; 928 } T_COLON constant_expr { 929 $$ = bitfield(NULL, to_int_constant($3, true)); 930 } 931 ; 932 933 enum_spec: 934 enum enum_tag { 935 $$ = mktag($2, ENUM, false, false); 936 } 937 | enum enum_tag { 938 dcs->d_tagtyp = mktag($2, ENUM, true, false); 939 } enum_declaration { 940 $$ = complete_tag_enum(dcs->d_tagtyp, $4); 941 } 942 | enum { 943 dcs->d_tagtyp = mktag(NULL, ENUM, true, false); 944 } enum_declaration { 945 $$ = complete_tag_enum(dcs->d_tagtyp, $3); 946 } 947 | enum error { 948 symtyp = FVFT; 949 $$ = gettyp(INT); 950 } 951 ; 952 953 enum: 954 T_ENUM { 955 symtyp = FTAG; 956 begin_declaration_level(CTCONST); 957 } 958 ; 959 960 enum_tag: 961 identifier { 962 $$ = getsym($1); 963 } 964 ; 965 966 enum_declaration: 967 enum_decl_lbrace enums_with_opt_comma T_RBRACE { 968 $$ = $2; 969 } 970 ; 971 972 enum_decl_lbrace: 973 T_LBRACE { 974 symtyp = FVFT; 975 enumval = 0; 976 } 977 ; 978 979 enums_with_opt_comma: 980 enums 981 | enums T_COMMA { 982 if (sflag) { 983 /* trailing ',' prohibited in enum declaration */ 984 error(54); 985 } else { 986 /* trailing ',' prohibited in enum declaration */ 987 c99ism(54); 988 } 989 $$ = $1; 990 } 991 ; 992 993 enums: 994 enumerator 995 | enums T_COMMA enumerator { 996 $$ = lnklst($1, $3); 997 } 998 | error { 999 $$ = NULL; 1000 } 1001 ; 1002 1003 enumerator: 1004 enumeration_constant { 1005 $$ = enumeration_constant($1, enumval, true); 1006 } 1007 | enumeration_constant T_ASSIGN constant_expr { 1008 $$ = enumeration_constant($1, to_int_constant($3, true), false); 1009 } 1010 ; 1011 1012 enumeration_constant: /* C99 6.4.4.3 */ 1013 identifier { 1014 $$ = getsym($1); 1015 } 1016 ; 1017 1018 1019 notype_init_decls: 1020 notype_init_decl 1021 | notype_init_decls T_COMMA type_init_decl 1022 ; 1023 1024 type_init_decls: 1025 type_init_decl 1026 | type_init_decls T_COMMA type_init_decl 1027 ; 1028 1029 /* See the Bison manual, section 7.1 "Semantic Info in Token Kinds". */ 1030 notype_init_decl: 1031 notype_decl asm_or_symbolrename_opt { 1032 cgram_declare($1, false, $2); 1033 check_size($1); 1034 } 1035 | notype_decl asm_or_symbolrename_opt { 1036 begin_initialization($1); 1037 cgram_declare($1, true, $2); 1038 } T_ASSIGN initializer { 1039 check_size($1); 1040 end_initialization(); 1041 } 1042 ; 1043 1044 type_init_decl: 1045 type_decl asm_or_symbolrename_opt { 1046 cgram_declare($1, false, $2); 1047 check_size($1); 1048 } 1049 | type_decl asm_or_symbolrename_opt { 1050 begin_initialization($1); 1051 cgram_declare($1, true, $2); 1052 } T_ASSIGN initializer { 1053 check_size($1); 1054 end_initialization(); 1055 } 1056 ; 1057 1058 notype_decl: 1059 notype_direct_decl 1060 | pointer notype_direct_decl { 1061 $$ = add_pointer($2, $1); 1062 } 1063 ; 1064 1065 type_decl: 1066 type_direct_decl 1067 | pointer type_direct_decl { 1068 $$ = add_pointer($2, $1); 1069 } 1070 ; 1071 1072 notype_direct_decl: 1073 T_NAME { 1074 $$ = declarator_name(getsym($1)); 1075 } 1076 | T_LPAREN type_decl T_RPAREN { 1077 $$ = $2; 1078 } 1079 | type_attribute notype_direct_decl { 1080 $$ = $2; 1081 } 1082 | notype_direct_decl T_LBRACK T_RBRACK { 1083 $$ = add_array($1, false, 0); 1084 } 1085 | notype_direct_decl T_LBRACK array_size T_RBRACK { 1086 $$ = add_array($1, true, to_int_constant($3, false)); 1087 } 1088 | notype_direct_decl param_list asm_or_symbolrename_opt { 1089 $$ = add_function(symbolrename($1, $3), $2); 1090 end_declaration_level(); 1091 block_level--; 1092 } 1093 | notype_direct_decl type_attribute_list 1094 ; 1095 1096 type_direct_decl: 1097 identifier { 1098 $$ = declarator_name(getsym($1)); 1099 } 1100 | T_LPAREN type_decl T_RPAREN { 1101 $$ = $2; 1102 } 1103 | type_attribute type_direct_decl { 1104 $$ = $2; 1105 } 1106 | type_direct_decl T_LBRACK T_RBRACK { 1107 $$ = add_array($1, false, 0); 1108 } 1109 | type_direct_decl T_LBRACK array_size T_RBRACK { 1110 $$ = add_array($1, true, to_int_constant($3, false)); 1111 } 1112 | type_direct_decl param_list asm_or_symbolrename_opt { 1113 $$ = add_function(symbolrename($1, $3), $2); 1114 end_declaration_level(); 1115 block_level--; 1116 } 1117 | type_direct_decl type_attribute_list 1118 ; 1119 1120 /* 1121 * param_decl and notype_param_decl exist to avoid a conflict in 1122 * argument lists. A typename enclosed in parens should always be 1123 * treated as a typename, not an argument. 1124 * "typedef int a; f(int (a));" is "typedef int a; f(int foo(a));" 1125 * not "typedef int a; f(int a);" 1126 */ 1127 param_decl: 1128 direct_param_decl 1129 | pointer direct_param_decl { 1130 $$ = add_pointer($2, $1); 1131 } 1132 ; 1133 1134 array_size: 1135 type_qualifier_list_opt T_SCLASS constant_expr { 1136 /* C11 6.7.6.3p7 */ 1137 if ($2 != STATIC) 1138 yyerror("Bad attribute"); 1139 /* static array size is a C11 extension */ 1140 c11ism(343); 1141 $$ = $3; 1142 } 1143 | constant_expr 1144 ; 1145 1146 direct_param_decl: 1147 identifier type_attribute_list { 1148 $$ = declarator_name(getsym($1)); 1149 } 1150 | identifier { 1151 $$ = declarator_name(getsym($1)); 1152 } 1153 | T_LPAREN notype_param_decl T_RPAREN { 1154 $$ = $2; 1155 } 1156 | direct_param_decl T_LBRACK T_RBRACK { 1157 $$ = add_array($1, false, 0); 1158 } 1159 | direct_param_decl T_LBRACK array_size T_RBRACK { 1160 $$ = add_array($1, true, to_int_constant($3, false)); 1161 } 1162 | direct_param_decl param_list asm_or_symbolrename_opt { 1163 $$ = add_function(symbolrename($1, $3), $2); 1164 end_declaration_level(); 1165 block_level--; 1166 } 1167 ; 1168 1169 notype_param_decl: 1170 direct_notype_param_decl 1171 | pointer direct_notype_param_decl { 1172 $$ = add_pointer($2, $1); 1173 } 1174 ; 1175 1176 direct_notype_param_decl: 1177 identifier { 1178 $$ = declarator_name(getsym($1)); 1179 } 1180 | T_LPAREN notype_param_decl T_RPAREN { 1181 $$ = $2; 1182 } 1183 | direct_notype_param_decl T_LBRACK T_RBRACK { 1184 $$ = add_array($1, false, 0); 1185 } 1186 | direct_notype_param_decl T_LBRACK array_size T_RBRACK { 1187 $$ = add_array($1, true, to_int_constant($3, false)); 1188 } 1189 | direct_notype_param_decl param_list asm_or_symbolrename_opt { 1190 $$ = add_function(symbolrename($1, $3), $2); 1191 end_declaration_level(); 1192 block_level--; 1193 } 1194 ; 1195 1196 pointer: /* C99 6.7.5 */ 1197 asterisk type_qualifier_list_opt { 1198 $$ = merge_qualified_pointer($1, $2); 1199 } 1200 | asterisk type_qualifier_list_opt pointer { 1201 $$ = merge_qualified_pointer($1, $2); 1202 $$ = merge_qualified_pointer($$, $3); 1203 } 1204 ; 1205 1206 asterisk: 1207 T_ASTERISK { 1208 $$ = xcalloc(1, sizeof(*$$)); 1209 $$->p_pointer = true; 1210 } 1211 ; 1212 1213 type_qualifier_list_opt: 1214 /* empty */ { 1215 $$ = NULL; 1216 } 1217 | type_qualifier_list 1218 ; 1219 1220 type_qualifier_list: /* C99 6.7.5 */ 1221 type_qualifier 1222 | type_qualifier_list type_qualifier { 1223 $$ = merge_qualified_pointer($1, $2); 1224 } 1225 ; 1226 1227 type_qualifier: 1228 T_QUAL { 1229 $$ = xcalloc(1, sizeof(*$$)); 1230 if ($1 == CONST) { 1231 $$->p_const = true; 1232 } else if ($1 == VOLATILE) { 1233 $$->p_volatile = true; 1234 } else { 1235 lint_assert($1 == RESTRICT || $1 == THREAD); 1236 } 1237 } 1238 ; 1239 1240 param_list: 1241 id_list_lparen identifier_list T_RPAREN { 1242 $$ = $2; 1243 } 1244 | abstract_decl_param_list 1245 ; 1246 1247 id_list_lparen: 1248 T_LPAREN { 1249 block_level++; 1250 begin_declaration_level(PROTO_ARG); 1251 } 1252 ; 1253 1254 identifier_list: 1255 T_NAME { 1256 $$ = old_style_function_name(getsym($1)); 1257 } 1258 | identifier_list T_COMMA T_NAME { 1259 $$ = lnklst($1, old_style_function_name(getsym($3))); 1260 } 1261 | identifier_list error 1262 ; 1263 1264 abstract_decl_param_list: 1265 abstract_decl_lparen T_RPAREN type_attribute_opt { 1266 $$ = NULL; 1267 } 1268 | abstract_decl_lparen vararg_parameter_type_list T_RPAREN type_attribute_opt { 1269 dcs->d_proto = true; 1270 $$ = $2; 1271 } 1272 | abstract_decl_lparen error T_RPAREN type_attribute_opt { 1273 $$ = NULL; 1274 } 1275 ; 1276 1277 abstract_decl_lparen: 1278 T_LPAREN { 1279 block_level++; 1280 begin_declaration_level(PROTO_ARG); 1281 } 1282 ; 1283 1284 vararg_parameter_type_list: 1285 parameter_type_list 1286 | parameter_type_list T_COMMA T_ELLIPSIS { 1287 dcs->d_vararg = true; 1288 $$ = $1; 1289 } 1290 | T_ELLIPSIS { 1291 if (sflag) { 1292 /* ANSI C requires formal parameter before '...' */ 1293 error(84); 1294 } else if (!tflag) { 1295 /* ANSI C requires formal parameter before '...' */ 1296 warning(84); 1297 } 1298 dcs->d_vararg = true; 1299 $$ = NULL; 1300 } 1301 ; 1302 1303 parameter_type_list: 1304 parameter_declaration 1305 | parameter_type_list T_COMMA parameter_declaration { 1306 $$ = lnklst($1, $3); 1307 } 1308 ; 1309 1310 parameter_declaration: 1311 declmods deftyp { 1312 $$ = declare_argument(abstract_name(), false); 1313 } 1314 | declaration_specifiers deftyp { 1315 $$ = declare_argument(abstract_name(), false); 1316 } 1317 | declmods deftyp notype_param_decl { 1318 $$ = declare_argument($3, false); 1319 } 1320 /* 1321 * param_decl is needed because of following conflict: 1322 * "typedef int a; f(int (a));" could be parsed as 1323 * "function with argument a of type int", or 1324 * "function with an abstract argument of type function". 1325 * This grammar realizes the second case. 1326 */ 1327 | declaration_specifiers deftyp param_decl { 1328 $$ = declare_argument($3, false); 1329 } 1330 | declmods deftyp abstract_declarator { 1331 $$ = declare_argument($3, false); 1332 } 1333 | declaration_specifiers deftyp abstract_declarator { 1334 $$ = declare_argument($3, false); 1335 } 1336 ; 1337 1338 asm_or_symbolrename_opt: /* expect only one */ 1339 /* empty */ { 1340 $$ = NULL; 1341 } 1342 | T_ASM T_LPAREN T_STRING T_RPAREN { 1343 freeyyv(&$3, T_STRING); 1344 $$ = NULL; 1345 } 1346 | T_SYMBOLRENAME T_LPAREN T_NAME T_RPAREN { 1347 $$ = $3; 1348 } 1349 ; 1350 1351 initializer: /* C99 6.7.8 "Initialization" */ 1352 expr %prec T_COMMA { 1353 init_expr($1); 1354 } 1355 | init_lbrace init_rbrace { 1356 /* XXX: Empty braces are not covered by C99 6.7.8. */ 1357 } 1358 | init_lbrace initializer_list comma_opt init_rbrace 1359 | error 1360 ; 1361 1362 initializer_list: /* C99 6.7.8 "Initialization" */ 1363 initializer_list_item 1364 | initializer_list T_COMMA initializer_list_item 1365 ; 1366 1367 initializer_list_item: 1368 designation initializer 1369 | initializer 1370 ; 1371 1372 designation: /* C99 6.7.8 "Initialization" */ 1373 designator_list T_ASSIGN 1374 | identifier T_COLON { 1375 /* GCC style struct or union member name in initializer */ 1376 gnuism(315); 1377 add_designator_member($1); 1378 } 1379 ; 1380 1381 designator_list: /* C99 6.7.8 "Initialization" */ 1382 designator 1383 | designator_list designator 1384 ; 1385 1386 designator: /* C99 6.7.8 "Initialization" */ 1387 T_LBRACK range T_RBRACK { 1388 add_designator_subscript($2); 1389 if (!Sflag) 1390 /* array initializer with des.s is a C9X feature */ 1391 warning(321); 1392 } 1393 | T_POINT identifier { 1394 if (!Sflag) 1395 /* struct or union member name in initializer is ... */ 1396 warning(313); 1397 add_designator_member($2); 1398 } 1399 ; 1400 1401 range: 1402 constant_expr { 1403 $$.lo = to_int_constant($1, true); 1404 $$.hi = $$.lo; 1405 } 1406 | constant_expr T_ELLIPSIS constant_expr { 1407 $$.lo = to_int_constant($1, true); 1408 $$.hi = to_int_constant($3, true); 1409 /* initialization with '[a...b]' is a GCC extension */ 1410 gnuism(340); 1411 } 1412 ; 1413 1414 init_lbrace: 1415 T_LBRACE { 1416 init_lbrace(); 1417 } 1418 ; 1419 1420 init_rbrace: 1421 T_RBRACE { 1422 init_rbrace(); 1423 } 1424 ; 1425 1426 type_name: /* C99 6.7.6 */ 1427 { 1428 begin_declaration_level(ABSTRACT); 1429 } abstract_declaration { 1430 end_declaration_level(); 1431 $$ = $2->s_type; 1432 } 1433 ; 1434 1435 abstract_declaration: 1436 noclass_declmods deftyp { 1437 $$ = declare_1_abstract(abstract_name()); 1438 } 1439 | noclass_declspecs deftyp { 1440 $$ = declare_1_abstract(abstract_name()); 1441 } 1442 | noclass_declmods deftyp abstract_declarator { 1443 $$ = declare_1_abstract($3); 1444 } 1445 | noclass_declspecs deftyp abstract_declarator { 1446 $$ = declare_1_abstract($3); 1447 } 1448 ; 1449 1450 abstract_declarator: /* C99 6.7.6 */ 1451 pointer { 1452 $$ = add_pointer(abstract_name(), $1); 1453 } 1454 | direct_abstract_declarator 1455 | pointer direct_abstract_declarator { 1456 $$ = add_pointer($2, $1); 1457 } 1458 | T_TYPEOF term { /* GCC extension */ 1459 $$ = mktempsym($2->tn_type); 1460 } 1461 ; 1462 1463 direct_abstract_declarator: /* C99 6.7.6 */ 1464 T_LPAREN abstract_declarator T_RPAREN { 1465 $$ = $2; 1466 } 1467 | T_LBRACK T_RBRACK { 1468 $$ = add_array(abstract_name(), false, 0); 1469 } 1470 | T_LBRACK array_size T_RBRACK { 1471 $$ = add_array(abstract_name(), true, to_int_constant($2, false)); 1472 } 1473 | type_attribute direct_abstract_declarator { 1474 $$ = $2; 1475 } 1476 | direct_abstract_declarator T_LBRACK T_RBRACK { 1477 $$ = add_array($1, false, 0); 1478 } 1479 | direct_abstract_declarator T_LBRACK T_ASTERISK T_RBRACK { /* C99 */ 1480 $$ = add_array($1, false, 0); 1481 } 1482 | direct_abstract_declarator T_LBRACK array_size T_RBRACK { 1483 $$ = add_array($1, true, to_int_constant($3, false)); 1484 } 1485 | abstract_decl_param_list asm_or_symbolrename_opt { 1486 $$ = add_function(symbolrename(abstract_name(), $2), $1); 1487 end_declaration_level(); 1488 block_level--; 1489 } 1490 | direct_abstract_declarator abstract_decl_param_list asm_or_symbolrename_opt { 1491 $$ = add_function(symbolrename($1, $3), $2); 1492 end_declaration_level(); 1493 block_level--; 1494 } 1495 | direct_abstract_declarator type_attribute_list 1496 ; 1497 1498 non_expr_statement: 1499 type_attribute T_SEMI 1500 | labeled_statement 1501 | compound_statement 1502 | selection_statement 1503 | iteration_statement 1504 | jump_statement { 1505 seen_fallthrough = false; 1506 } 1507 | asm_statement 1508 ; 1509 1510 statement: /* C99 6.8 */ 1511 expr_statement 1512 | non_expr_statement 1513 ; 1514 1515 labeled_statement: /* C99 6.8.1 */ 1516 label type_attribute_opt statement 1517 ; 1518 1519 label: 1520 T_NAME T_COLON { 1521 symtyp = FLABEL; 1522 named_label(getsym($1)); 1523 } 1524 | T_CASE constant_expr T_COLON { 1525 case_label($2); 1526 seen_fallthrough = true; 1527 } 1528 | T_CASE constant_expr T_ELLIPSIS constant_expr T_COLON { 1529 /* XXX: We don't fill all cases */ 1530 case_label($2); 1531 seen_fallthrough = true; 1532 } 1533 | T_DEFAULT T_COLON { 1534 default_label(); 1535 seen_fallthrough = true; 1536 } 1537 ; 1538 1539 compound_statement: /* C99 6.8.2 */ 1540 compound_statement_lbrace compound_statement_rbrace 1541 | compound_statement_lbrace block_item_list compound_statement_rbrace 1542 ; 1543 1544 compound_statement_lbrace: 1545 T_LBRACE { 1546 block_level++; 1547 mem_block_level++; 1548 begin_declaration_level(AUTO); 1549 } 1550 ; 1551 1552 compound_statement_rbrace: 1553 T_RBRACE { 1554 end_declaration_level(); 1555 freeblk(); 1556 mem_block_level--; 1557 block_level--; 1558 seen_fallthrough = false; 1559 } 1560 ; 1561 1562 block_item_list: 1563 block_item 1564 | block_item_list block_item { 1565 if (!Sflag && $1 && !$2) 1566 /* declarations after statements is a C99 feature */ 1567 c99ism(327); 1568 $$ = $1 || $2; 1569 } 1570 ; 1571 1572 block_item: 1573 statement { 1574 $$ = true; 1575 restore_warning_flags(); 1576 } 1577 | declaration { 1578 $$ = false; 1579 restore_warning_flags(); 1580 } 1581 ; 1582 1583 expr_statement: 1584 expr T_SEMI { 1585 expr($1, false, false, false, false); 1586 seen_fallthrough = false; 1587 } 1588 | T_SEMI { 1589 seen_fallthrough = false; 1590 } 1591 ; 1592 1593 selection_statement: /* C99 6.8.4 */ 1594 if_without_else { 1595 save_warning_flags(); 1596 if2(); 1597 if3(false); 1598 } 1599 | if_without_else T_ELSE { 1600 save_warning_flags(); 1601 if2(); 1602 } statement { 1603 clear_warning_flags(); 1604 if3(true); 1605 } 1606 | if_without_else T_ELSE error { 1607 clear_warning_flags(); 1608 if3(false); 1609 } 1610 | switch_expr statement { 1611 clear_warning_flags(); 1612 switch2(); 1613 } 1614 | switch_expr error { 1615 clear_warning_flags(); 1616 switch2(); 1617 } 1618 ; 1619 1620 if_without_else: 1621 if_expr statement 1622 | if_expr error 1623 ; 1624 1625 if_expr: 1626 T_IF T_LPAREN expr T_RPAREN { 1627 if1($3); 1628 clear_warning_flags(); 1629 } 1630 ; 1631 1632 switch_expr: 1633 T_SWITCH T_LPAREN expr T_RPAREN { 1634 switch1($3); 1635 clear_warning_flags(); 1636 } 1637 ; 1638 1639 generic_selection: /* C11 6.5.1.1 */ 1640 T_GENERIC T_LPAREN assignment_expression T_COMMA 1641 generic_assoc_list T_RPAREN { 1642 /* generic selection requires C11 or later */ 1643 c11ism(345); 1644 $$ = build_generic_selection($3, $5); 1645 } 1646 ; 1647 1648 generic_assoc_list: /* C11 6.5.1.1 */ 1649 generic_association 1650 | generic_assoc_list T_COMMA generic_association { 1651 $3->ga_prev = $1; 1652 $$ = $3; 1653 } 1654 ; 1655 1656 generic_association: /* C11 6.5.1.1 */ 1657 type_name T_COLON assignment_expression { 1658 $$ = getblk(sizeof(*$$)); 1659 $$->ga_arg = $1; 1660 $$->ga_result = $3; 1661 } 1662 | T_DEFAULT T_COLON assignment_expression { 1663 $$ = getblk(sizeof(*$$)); 1664 $$->ga_arg = NULL; 1665 $$->ga_result = $3; 1666 } 1667 ; 1668 1669 do_statement: /* C99 6.8.5 */ 1670 do statement { 1671 clear_warning_flags(); 1672 } 1673 ; 1674 1675 iteration_statement: /* C99 6.8.5 */ 1676 while_expr statement { 1677 clear_warning_flags(); 1678 while2(); 1679 } 1680 | while_expr error { 1681 clear_warning_flags(); 1682 while2(); 1683 } 1684 | do_statement do_while_expr { 1685 do2($2); 1686 seen_fallthrough = false; 1687 } 1688 | do error { 1689 clear_warning_flags(); 1690 do2(NULL); 1691 } 1692 | for_exprs statement { 1693 clear_warning_flags(); 1694 for2(); 1695 end_declaration_level(); 1696 block_level--; 1697 } 1698 | for_exprs error { 1699 clear_warning_flags(); 1700 for2(); 1701 end_declaration_level(); 1702 block_level--; 1703 } 1704 ; 1705 1706 while_expr: 1707 T_WHILE T_LPAREN expr T_RPAREN { 1708 while1($3); 1709 clear_warning_flags(); 1710 } 1711 ; 1712 1713 do: 1714 T_DO { 1715 do1(); 1716 } 1717 ; 1718 1719 do_while_expr: 1720 T_WHILE T_LPAREN expr T_RPAREN T_SEMI { 1721 $$ = $3; 1722 } 1723 ; 1724 1725 for_start: 1726 T_FOR T_LPAREN { 1727 begin_declaration_level(AUTO); 1728 block_level++; 1729 } 1730 ; 1731 1732 for_exprs: 1733 for_start declaration_specifiers deftyp notype_init_decls T_SEMI 1734 expr_opt T_SEMI expr_opt T_RPAREN { 1735 /* variable declaration in for loop */ 1736 c99ism(325); 1737 for1(NULL, $6, $8); 1738 clear_warning_flags(); 1739 } 1740 | for_start expr_opt T_SEMI expr_opt T_SEMI expr_opt T_RPAREN { 1741 for1($2, $4, $6); 1742 clear_warning_flags(); 1743 } 1744 ; 1745 1746 expr_opt: 1747 /* empty */ { 1748 $$ = NULL; 1749 } 1750 | expr 1751 ; 1752 1753 jump_statement: /* C99 6.8.6 */ 1754 goto identifier T_SEMI { 1755 do_goto(getsym($2)); 1756 } 1757 | goto error T_SEMI { 1758 symtyp = FVFT; 1759 } 1760 | T_CONTINUE T_SEMI { 1761 do_continue(); 1762 } 1763 | T_BREAK T_SEMI { 1764 do_break(); 1765 } 1766 | T_RETURN T_SEMI { 1767 do_return(NULL); 1768 } 1769 | T_RETURN expr T_SEMI { 1770 do_return($2); 1771 } 1772 ; 1773 1774 goto: 1775 T_GOTO { 1776 symtyp = FLABEL; 1777 } 1778 ; 1779 1780 asm_statement: 1781 T_ASM T_LPAREN read_until_rparen T_SEMI { 1782 setasm(); 1783 } 1784 | T_ASM T_QUAL T_LPAREN read_until_rparen T_SEMI { 1785 setasm(); 1786 } 1787 | T_ASM error 1788 ; 1789 1790 read_until_rparen: 1791 /* empty */ { 1792 ignore_up_to_rparen(); 1793 } 1794 ; 1795 1796 constant_expr_list_opt: 1797 /* empty */ 1798 | constant_expr_list 1799 ; 1800 1801 constant_expr_list: 1802 constant_expr 1803 | constant_expr_list T_COMMA constant_expr 1804 ; 1805 1806 constant_expr: /* C99 6.6 */ 1807 expr %prec T_ASSIGN 1808 ; 1809 1810 expr: 1811 expr T_ASTERISK expr { 1812 $$ = build(MULT, $1, $3); 1813 } 1814 | expr T_MULTIPLICATIVE expr { 1815 $$ = build($2, $1, $3); 1816 } 1817 | expr T_ADDITIVE expr { 1818 $$ = build($2, $1, $3); 1819 } 1820 | expr T_SHIFT expr { 1821 $$ = build($2, $1, $3); 1822 } 1823 | expr T_RELATIONAL expr { 1824 $$ = build($2, $1, $3); 1825 } 1826 | expr T_EQUALITY expr { 1827 $$ = build($2, $1, $3); 1828 } 1829 | expr T_AMPER expr { 1830 $$ = build(BITAND, $1, $3); 1831 } 1832 | expr T_BITXOR expr { 1833 $$ = build(BITXOR, $1, $3); 1834 } 1835 | expr T_BITOR expr { 1836 $$ = build(BITOR, $1, $3); 1837 } 1838 | expr T_LOGAND expr { 1839 $$ = build(LOGAND, $1, $3); 1840 } 1841 | expr T_LOGOR expr { 1842 $$ = build(LOGOR, $1, $3); 1843 } 1844 | expr T_QUEST expr T_COLON expr { 1845 $$ = build(QUEST, $1, build(COLON, $3, $5)); 1846 } 1847 | expr T_ASSIGN expr { 1848 $$ = build(ASSIGN, $1, $3); 1849 } 1850 | expr T_OPASSIGN expr { 1851 $$ = build($2, $1, $3); 1852 } 1853 | expr T_COMMA expr { 1854 $$ = build(COMMA, $1, $3); 1855 } 1856 | term 1857 | generic_selection 1858 ; 1859 1860 assignment_expression: /* C99 6.5.16 */ 1861 expr %prec T_ASSIGN 1862 ; 1863 1864 term: 1865 T_NAME { 1866 /* XXX really necessary? */ 1867 if (yychar < 0) 1868 yychar = yylex(); 1869 $$ = new_name_node(getsym($1), yychar); 1870 } 1871 | string { 1872 $$ = new_string_node($1); 1873 } 1874 | T_CON { 1875 $$ = expr_new_constant(gettyp($1->v_tspec), $1); 1876 } 1877 | T_LPAREN expr T_RPAREN { 1878 if ($2 != NULL) 1879 $2->tn_parenthesized = true; 1880 $$ = $2; 1881 } 1882 | T_LPAREN compound_statement_lbrace gcc_statement_expr_list { 1883 block_level--; 1884 mem_block_level--; 1885 begin_initialization(mktempsym(dup_type($3->tn_type))); 1886 mem_block_level++; 1887 block_level++; 1888 /* ({ }) is a GCC extension */ 1889 gnuism(320); 1890 } compound_statement_rbrace T_RPAREN { 1891 $$ = new_name_node(*current_initsym(), 0); 1892 end_initialization(); 1893 } 1894 | term T_INCDEC { 1895 $$ = build($2 == INC ? INCAFT : DECAFT, $1, NULL); 1896 } 1897 | T_INCDEC term { 1898 $$ = build($1 == INC ? INCBEF : DECBEF, $2, NULL); 1899 } 1900 | T_ASTERISK term { 1901 $$ = build(INDIR, $2, NULL); 1902 } 1903 | T_AMPER term { 1904 $$ = build(ADDR, $2, NULL); 1905 } 1906 | T_UNARY term { 1907 $$ = build($1, $2, NULL); 1908 } 1909 | T_ADDITIVE term { 1910 if (tflag && $1 == PLUS) { 1911 /* unary + is illegal in traditional C */ 1912 warning(100); 1913 } 1914 $$ = build($1 == PLUS ? UPLUS : UMINUS, $2, NULL); 1915 } 1916 | term T_LBRACK expr T_RBRACK { 1917 $$ = build(INDIR, build(PLUS, $1, $3), NULL); 1918 } 1919 | term T_LPAREN T_RPAREN { 1920 $$ = new_function_call_node($1, NULL); 1921 } 1922 | term T_LPAREN func_arg_list T_RPAREN { 1923 $$ = new_function_call_node($1, $3); 1924 } 1925 | term point_or_arrow T_NAME { 1926 if ($1 != NULL) { 1927 sym_t *msym; 1928 /* 1929 * XXX struct_or_union_member should be integrated 1930 * in build() 1931 */ 1932 if ($2 == ARROW) { 1933 /* 1934 * must do this before struct_or_union_member 1935 * is called 1936 */ 1937 $1 = cconv($1); 1938 } 1939 msym = struct_or_union_member($1, $2, getsym($3)); 1940 $$ = build($2, $1, new_name_node(msym, 0)); 1941 } else { 1942 $$ = NULL; 1943 } 1944 } 1945 | T_REAL term { 1946 $$ = build(REAL, $2, NULL); 1947 } 1948 | T_IMAG term { 1949 $$ = build(IMAG, $2, NULL); 1950 } 1951 | T_EXTENSION term { 1952 $$ = $2; 1953 } 1954 | T_REAL T_LPAREN term T_RPAREN { 1955 $$ = build(REAL, $3, NULL); 1956 } 1957 | T_IMAG T_LPAREN term T_RPAREN { 1958 $$ = build(IMAG, $3, NULL); 1959 } 1960 | T_BUILTIN_OFFSETOF T_LPAREN type_name T_COMMA identifier T_RPAREN { 1961 symtyp = FMEMBER; 1962 $$ = build_offsetof($3, getsym($5)); 1963 } 1964 | T_SIZEOF term { 1965 $$ = $2 == NULL ? NULL : build_sizeof($2->tn_type); 1966 if ($$ != NULL) 1967 check_expr_misc($2, false, false, false, false, false, true); 1968 } 1969 | T_SIZEOF T_LPAREN type_name T_RPAREN %prec T_SIZEOF { 1970 $$ = build_sizeof($3); 1971 } 1972 | T_ALIGNOF T_LPAREN type_name T_RPAREN { 1973 $$ = build_alignof($3); 1974 } 1975 | T_LPAREN type_name T_RPAREN term %prec T_UNARY { 1976 $$ = cast($4, $2); 1977 } 1978 | T_LPAREN type_name T_RPAREN { /* C99 6.5.2.5 "Compound literals" */ 1979 sym_t *tmp = mktempsym($2); 1980 begin_initialization(tmp); 1981 cgram_declare(tmp, true, NULL); 1982 } init_lbrace initializer_list comma_opt init_rbrace { 1983 if (!Sflag) 1984 /* compound literals are a C9X/GCC extension */ 1985 gnuism(319); 1986 $$ = new_name_node(*current_initsym(), 0); 1987 end_initialization(); 1988 } 1989 ; 1990 1991 /* 1992 * The inner part of a GCC statement-expression of the form ({ ... }). 1993 * 1994 * https://gcc.gnu.org/onlinedocs/gcc/Statement-Exprs.html 1995 */ 1996 gcc_statement_expr_list: 1997 gcc_statement_expr_item 1998 | gcc_statement_expr_list gcc_statement_expr_item { 1999 $$ = $2; 2000 } 2001 ; 2002 2003 gcc_statement_expr_item: 2004 declaration { 2005 clear_warning_flags(); 2006 $$ = NULL; 2007 } 2008 | non_expr_statement { 2009 $$ = expr_zalloc_tnode(); 2010 $$->tn_type = gettyp(VOID); 2011 } 2012 | expr T_SEMI { 2013 if ($1 == NULL) { /* in case of syntax errors */ 2014 $$ = expr_zalloc_tnode(); 2015 $$->tn_type = gettyp(VOID); 2016 } else { 2017 /* XXX: do that only on the last name */ 2018 if ($1->tn_op == NAME) 2019 $1->tn_sym->s_used = true; 2020 $$ = $1; 2021 expr($1, false, false, false, false); 2022 seen_fallthrough = false; 2023 } 2024 } 2025 ; 2026 2027 string: 2028 T_STRING 2029 | T_STRING string2 { 2030 $$ = cat_strings($1, $2); 2031 } 2032 ; 2033 2034 string2: 2035 T_STRING { 2036 if (tflag) { 2037 /* concatenated strings are illegal in traditional C */ 2038 warning(219); 2039 } 2040 $$ = $1; 2041 } 2042 | string2 T_STRING { 2043 $$ = cat_strings($1, $2); 2044 } 2045 ; 2046 2047 func_arg_list: 2048 expr %prec T_COMMA { 2049 $$ = new_function_argument_node(NULL, $1); 2050 } 2051 | func_arg_list T_COMMA expr { 2052 $$ = new_function_argument_node($1, $3); 2053 } 2054 ; 2055 2056 point_or_arrow: 2057 T_POINT { 2058 symtyp = FMEMBER; 2059 $$ = POINT; 2060 } 2061 | T_ARROW { 2062 symtyp = FMEMBER; 2063 $$ = ARROW; 2064 } 2065 ; 2066 2067 identifier: /* C99 6.4.2.1 */ 2068 T_NAME { 2069 $$ = $1; 2070 cgram_debug("name '%s'", $$->sb_name); 2071 } 2072 | T_TYPENAME { 2073 $$ = $1; 2074 cgram_debug("typename '%s'", $$->sb_name); 2075 } 2076 ; 2077 2078 comma_opt: 2079 /* empty */ 2080 | T_COMMA 2081 ; 2082 2083 %% 2084 2085 /* ARGSUSED */ 2086 int 2087 yyerror(const char *msg) 2088 { 2089 /* syntax error '%s' */ 2090 error(249, yytext); 2091 if (++sytxerr >= 5) 2092 norecover(); 2093 return 0; 2094 } 2095 2096 static void 2097 cgram_declare(sym_t *decl, bool initflg, sbuf_t *renaming) 2098 { 2099 declare(decl, initflg, renaming); 2100 if (renaming != NULL) 2101 freeyyv(&renaming, T_NAME); 2102 } 2103 2104 /* 2105 * Discard all input tokens up to and including the next 2106 * unmatched right paren 2107 */ 2108 static void 2109 ignore_up_to_rparen(void) 2110 { 2111 int level; 2112 2113 if (yychar < 0) 2114 yychar = yylex(); 2115 freeyyv(&yylval, yychar); 2116 2117 level = 1; 2118 while (yychar != T_RPAREN || --level > 0) { 2119 if (yychar == T_LPAREN) { 2120 level++; 2121 } else if (yychar <= 0) { 2122 break; 2123 } 2124 freeyyv(&yylval, yychar = yylex()); 2125 } 2126 2127 yyclearin; 2128 } 2129 2130 static sym_t * 2131 symbolrename(sym_t *s, sbuf_t *sb) 2132 { 2133 if (sb != NULL) 2134 s->s_rename = sb->sb_name; 2135 return s; 2136 } 2137
Indexes created Thu Oct 02 14:10:14 GMT 2025