cgram.y revision 1.259
1 %{ 2 /* $NetBSD: cgram.y,v 1.259 2021/07/06 17:52:04 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 1.259 2021/07/06 17:52:04 rillig Exp $"); 39 #endif 40 41 #include <limits.h> 42 #include <stdlib.h> 43 #include <string.h> 44 45 #include "lint1.h" 46 47 extern char *yytext; 48 49 /* 50 * Contains the level of current declaration, used for symbol table entries. 51 * 0 is the top-level, > 0 is inside a function body. 52 */ 53 int block_level; 54 55 /* 56 * level for memory allocation. Normally the same as block_level. 57 * An exception is the declaration of arguments in prototypes. Memory 58 * for these can't be freed after the declaration, but symbols must 59 * be removed from the symbol table after the declaration. 60 */ 61 int mem_block_level; 62 63 /* 64 * Save the no-warns state and restore it to avoid the problem where 65 * if (expr) { stmt } / * NOLINT * / stmt; 66 */ 67 static int olwarn = LWARN_BAD; 68 69 static void cgram_declare(sym_t *, bool, sbuf_t *); 70 static void ignore_up_to_rparen(void); 71 static sym_t *symbolrename(sym_t *, sbuf_t *); 72 73 74 #ifdef DEBUG 75 static void 76 CLEAR_WARN_FLAGS(const char *file, size_t line) 77 { 78 printf("%s:%d: %s:%zu: clearing flags\n", 79 curr_pos.p_file, curr_pos.p_line, file, line); 80 clear_warn_flags(); 81 olwarn = LWARN_BAD; 82 } 83 84 static void 85 SAVE_WARN_FLAGS(const char *file, size_t line) 86 { 87 lint_assert(olwarn == LWARN_BAD); 88 printf("%s:%d: %s:%zu: saving flags %d\n", 89 curr_pos.p_file, curr_pos.p_line, file, line, lwarn); 90 olwarn = lwarn; 91 } 92 93 static void 94 RESTORE_WARN_FLAGS(const char *file, size_t line) 95 { 96 if (olwarn != LWARN_BAD) { 97 lwarn = olwarn; 98 printf("%s:%d: %s:%zu: restoring flags %d\n", 99 curr_pos.p_file, curr_pos.p_line, file, line, lwarn); 100 olwarn = LWARN_BAD; 101 } else 102 CLEAR_WARN_FLAGS(file, line); 103 } 104 #define cgram_debug(fmt, args...) printf("cgram_debug: " fmt "\n", ##args) 105 #else 106 #define CLEAR_WARN_FLAGS(f, l) clear_warn_flags(), olwarn = LWARN_BAD 107 #define SAVE_WARN_FLAGS(f, l) olwarn = lwarn 108 #define RESTORE_WARN_FLAGS(f, l) \ 109 (void)(olwarn == LWARN_BAD ? (clear_warn_flags(), 0) : (lwarn = olwarn)) 110 #define cgram_debug(fmt, args...) do { } while (false) 111 #endif 112 113 #define clear_warning_flags() CLEAR_WARN_FLAGS(__FILE__, __LINE__) 114 #define save_warning_flags() SAVE_WARN_FLAGS(__FILE__, __LINE__) 115 #define restore_warning_flags() RESTORE_WARN_FLAGS(__FILE__, __LINE__) 116 117 /* unbind the anonymous struct members from the struct */ 118 static void 119 anonymize(sym_t *s) 120 { 121 for ( ; s != NULL; s = s->s_next) 122 s->s_styp = NULL; 123 } 124 %} 125 126 %expect 166 127 128 %union { 129 val_t *y_val; 130 sbuf_t *y_sb; 131 sym_t *y_sym; 132 op_t y_op; 133 scl_t y_scl; 134 tspec_t y_tspec; 135 tqual_t y_tqual; 136 type_t *y_type; 137 tnode_t *y_tnode; 138 range_t y_range; 139 strg_t *y_string; 140 qual_ptr *y_qual_ptr; 141 bool y_seen_statement; 142 struct generic_association *y_generic; 143 }; 144 145 %token T_LBRACE T_RBRACE T_LBRACK T_RBRACK T_LPAREN T_RPAREN 146 %token T_POINT T_ARROW 147 %token <y_op> T_UNARY 148 %token <y_op> T_INCDEC 149 %token T_SIZEOF 150 %token T_BUILTIN_OFFSETOF 151 %token T_TYPEOF 152 %token T_EXTENSION 153 %token T_ALIGNAS 154 %token T_ALIGNOF 155 %token T_ASTERISK 156 %token <y_op> T_MULTIPLICATIVE 157 %token <y_op> T_ADDITIVE 158 %token <y_op> T_SHIFT 159 %token <y_op> T_RELATIONAL 160 %token <y_op> T_EQUALITY 161 %token T_AMPER 162 %token T_BITXOR 163 %token T_BITOR 164 %token T_LOGAND 165 %token T_LOGOR 166 %token T_QUEST 167 %token T_COLON 168 %token T_ASSIGN 169 %token <y_op> T_OPASSIGN 170 %token T_COMMA 171 %token T_SEMI 172 %token T_ELLIPSIS 173 %token T_REAL 174 %token T_IMAG 175 %token T_GENERIC 176 %token T_NORETURN 177 178 /* storage classes (extern, static, auto, register and typedef) */ 179 %token <y_scl> T_SCLASS 180 181 /* 182 * predefined type keywords (char, int, short, long, unsigned, signed, 183 * float, double, void); see T_TYPENAME 184 */ 185 %token <y_tspec> T_TYPE 186 187 /* qualifiers (const, volatile, restrict, _Thread_local) */ 188 %token <y_tqual> T_QUAL 189 190 /* struct or union */ 191 %token <y_tspec> T_STRUCT_OR_UNION 192 193 /* remaining keywords */ 194 %token T_ASM 195 %token T_BREAK 196 %token T_CASE 197 %token T_CONTINUE 198 %token T_DEFAULT 199 %token T_DO 200 %token T_ELSE 201 %token T_ENUM 202 %token T_FOR 203 %token T_GOTO 204 %token T_IF 205 %token T_PACKED 206 %token T_RETURN 207 %token T_SWITCH 208 %token T_SYMBOLRENAME 209 %token T_WHILE 210 /* Type Attributes */ 211 %token <y_type> T_ATTRIBUTE 212 %token <y_type> T_AT_ALIAS 213 %token <y_type> T_AT_ALIGNED 214 %token <y_type> T_AT_ALLOC_SIZE 215 %token <y_type> T_AT_ALWAYS_INLINE 216 %token <y_type> T_AT_BOUNDED 217 %token <y_type> T_AT_BUFFER 218 %token <y_type> T_AT_COLD 219 %token <y_type> T_AT_COMMON 220 %token <y_type> T_AT_CONSTRUCTOR 221 %token <y_type> T_AT_DEPRECATED 222 %token <y_type> T_AT_DESTRUCTOR 223 %token <y_type> T_AT_FALLTHROUGH 224 %token <y_type> T_AT_FORMAT 225 %token <y_type> T_AT_FORMAT_ARG 226 %token <y_type> T_AT_FORMAT_GNU_PRINTF 227 %token <y_type> T_AT_FORMAT_PRINTF 228 %token <y_type> T_AT_FORMAT_SCANF 229 %token <y_type> T_AT_FORMAT_STRFMON 230 %token <y_type> T_AT_FORMAT_STRFTIME 231 %token <y_type> T_AT_FORMAT_SYSLOG 232 %token <y_type> T_AT_GNU_INLINE 233 %token <y_type> T_AT_MALLOC 234 %token <y_type> T_AT_MAY_ALIAS 235 %token <y_type> T_AT_MINBYTES 236 %token <y_type> T_AT_MODE 237 %token <y_type> T_AT_NOINLINE 238 %token <y_type> T_AT_NONNULL 239 %token <y_type> T_AT_NONSTRING 240 %token <y_type> T_AT_NORETURN 241 %token <y_type> T_AT_NOTHROW 242 %token <y_type> T_AT_NO_INSTRUMENT_FUNCTION 243 %token <y_type> T_AT_OPTIMIZE 244 %token <y_type> T_AT_PACKED 245 %token <y_type> T_AT_PCS 246 %token <y_type> T_AT_PURE 247 %token <y_type> T_AT_RETURNS_TWICE 248 %token <y_type> T_AT_SECTION 249 %token <y_type> T_AT_SENTINEL 250 %token <y_type> T_AT_STRING 251 %token <y_type> T_AT_TLS_MODEL 252 %token <y_type> T_AT_TUNION 253 %token <y_type> T_AT_UNUSED 254 %token <y_type> T_AT_USED 255 %token <y_type> T_AT_VISIBILITY 256 %token <y_type> T_AT_WARN_UNUSED_RESULT 257 %token <y_type> T_AT_WEAK 258 259 %left T_COMMA 260 %right T_ASSIGN T_OPASSIGN 261 %right T_QUEST T_COLON 262 %left T_LOGOR 263 %left T_LOGAND 264 %left T_BITOR 265 %left T_BITXOR 266 %left T_AMPER 267 %left T_EQUALITY 268 %left T_RELATIONAL 269 %left T_SHIFT 270 %left T_ADDITIVE 271 %left T_ASTERISK T_MULTIPLICATIVE 272 %right T_UNARY T_INCDEC T_SIZEOF T_REAL T_IMAG 273 %left T_LPAREN T_LBRACK T_POINT T_ARROW 274 275 %token <y_sb> T_NAME 276 %token <y_sb> T_TYPENAME 277 %token <y_val> T_CON 278 %token <y_string> T_STRING 279 280 %type <y_sym> func_decl 281 %type <y_sym> notype_decl 282 %type <y_sym> type_decl 283 %type <y_type> typespec 284 %type <y_type> clrtyp_typespec 285 %type <y_type> notype_typespec 286 %type <y_type> struct_spec 287 %type <y_type> enum_spec 288 %type <y_sym> struct_tag 289 %type <y_sym> enum_tag 290 %type <y_tspec> struct 291 %type <y_sym> struct_declaration 292 %type <y_sb> identifier 293 %type <y_sym> member_declaration_list_with_rbrace 294 %type <y_sym> member_declaration_list 295 %type <y_sym> member_declaration 296 %type <y_sym> notype_member_decls 297 %type <y_sym> type_member_decls 298 %type <y_sym> notype_member_decl 299 %type <y_sym> type_member_decl 300 %type <y_tnode> constant_expr 301 %type <y_tnode> array_size 302 %type <y_sym> enum_declaration 303 %type <y_sym> enumerator_list 304 %type <y_sym> enumerator 305 %type <y_sym> enumeration_constant 306 %type <y_sym> notype_direct_decl 307 %type <y_sym> type_direct_decl 308 %type <y_qual_ptr> pointer 309 %type <y_qual_ptr> asterisk 310 %type <y_sym> type_param_decl 311 %type <y_sym> param_list 312 %type <y_sym> abstract_decl_param_list 313 %type <y_sym> direct_param_decl 314 %type <y_sym> notype_param_decl 315 %type <y_sym> direct_notype_param_decl 316 %type <y_qual_ptr> type_qualifier_list_opt 317 %type <y_qual_ptr> type_qualifier_list 318 %type <y_qual_ptr> type_qualifier 319 %type <y_sym> identifier_list 320 %type <y_sym> abstract_declarator 321 %type <y_sym> direct_abstract_declarator 322 %type <y_sym> vararg_parameter_type_list 323 %type <y_sym> parameter_type_list 324 %type <y_sym> parameter_declaration 325 %type <y_tnode> expr 326 %type <y_tnode> assignment_expression 327 %type <y_tnode> gcc_statement_expr_list 328 %type <y_tnode> gcc_statement_expr_item 329 %type <y_tnode> term 330 %type <y_tnode> generic_selection 331 %type <y_tnode> func_arg_list 332 %type <y_op> point_or_arrow 333 %type <y_type> type_name 334 %type <y_sym> abstract_declaration 335 %type <y_tnode> do_while_expr 336 %type <y_tnode> expr_opt 337 %type <y_string> string 338 %type <y_string> string2 339 %type <y_sb> asm_or_symbolrename_opt 340 %type <y_range> range 341 %type <y_seen_statement> block_item_list 342 %type <y_seen_statement> block_item 343 %type <y_generic> generic_assoc_list 344 %type <y_generic> generic_association 345 346 347 %% 348 349 program: 350 /* empty */ { 351 if (sflag) { 352 /* empty translation unit */ 353 error(272); 354 } else if (!tflag) { 355 /* empty translation unit */ 356 warning(272); 357 } 358 } 359 | translation_unit 360 ; 361 362 translation_unit: /* C99 6.9 */ 363 external_declaration 364 | translation_unit external_declaration 365 ; 366 367 external_declaration: /* C99 6.9 */ 368 asm_statement 369 | function_definition { 370 global_clean_up_decl(false); 371 clear_warning_flags(); 372 } 373 | top_level_declaration { 374 global_clean_up_decl(false); 375 clear_warning_flags(); 376 } 377 ; 378 379 /* 380 * On the top level, lint allows several forms of declarations that it doesn't 381 * allow in functions. For example, a single ';' is an empty declaration and 382 * is supported by some compilers, but in a function it would be an empty 383 * statement, not a declaration. This makes a difference in C90 mode, where 384 * a statement must not be followed by a declaration. 385 * 386 * See 'declaration' for all other declarations. 387 */ 388 top_level_declaration: /* C99 6.9 calls this 'declaration' */ 389 T_SEMI { 390 if (sflag) { 391 /* empty declaration */ 392 error(0); 393 } else if (!tflag) { 394 /* empty declaration */ 395 warning(0); 396 } 397 } 398 | clrtyp deftyp notype_init_decls T_SEMI { 399 if (sflag) { 400 /* old style declaration; add 'int' */ 401 error(1); 402 } else if (!tflag) { 403 /* old style declaration; add 'int' */ 404 warning(1); 405 } 406 } 407 | declmods deftyp T_SEMI { 408 if (dcs->d_scl == TYPEDEF) { 409 /* typedef declares no type name */ 410 warning(72); 411 } else { 412 /* empty declaration */ 413 warning(2); 414 } 415 } 416 | declmods deftyp notype_init_decls T_SEMI 417 | declaration_specifiers deftyp T_SEMI { 418 if (dcs->d_scl == TYPEDEF) { 419 /* typedef declares no type name */ 420 warning(72); 421 } else if (!dcs->d_nonempty_decl) { 422 /* empty declaration */ 423 warning(2); 424 } 425 } 426 | declaration_specifiers deftyp type_init_decls T_SEMI 427 | error T_SEMI { 428 global_clean_up(); 429 } 430 | error T_RBRACE { 431 global_clean_up(); 432 } 433 ; 434 435 function_definition: /* C99 6.9.1 */ 436 func_decl { 437 if ($1->s_type->t_tspec != FUNC) { 438 /* syntax error '%s' */ 439 error(249, yytext); 440 YYERROR; 441 } 442 if ($1->s_type->t_typedef) { 443 /* ()-less function definition */ 444 error(64); 445 YYERROR; 446 } 447 funcdef($1); 448 block_level++; 449 begin_declaration_level(ARG); 450 if (lwarn == LWARN_NONE) 451 $1->s_used = true; 452 } arg_declaration_list_opt { 453 end_declaration_level(); 454 block_level--; 455 check_func_lint_directives(); 456 check_func_old_style_arguments(); 457 begin_control_statement(CS_FUNCTION_BODY); 458 } compound_statement { 459 funcend(); 460 end_control_statement(CS_FUNCTION_BODY); 461 } 462 ; 463 464 func_decl: 465 clrtyp deftyp notype_decl { 466 $$ = $3; 467 } 468 | declmods deftyp notype_decl { 469 $$ = $3; 470 } 471 | declaration_specifiers deftyp type_decl { 472 $$ = $3; 473 } 474 ; 475 476 arg_declaration_list_opt: /* C99 6.9.1p13 example 1 */ 477 /* empty */ 478 | arg_declaration_list 479 ; 480 481 arg_declaration_list: /* C99 6.9.1p13 example 1 */ 482 arg_declaration 483 | arg_declaration_list arg_declaration 484 /* XXX or better "arg_declaration error" ? */ 485 | error 486 ; 487 488 /* 489 * "arg_declaration" is separated from "declaration" because it 490 * needs other error handling. 491 */ 492 arg_declaration: 493 declmods deftyp T_SEMI { 494 /* empty declaration */ 495 warning(2); 496 } 497 | declmods deftyp notype_init_decls T_SEMI 498 | declaration_specifiers deftyp T_SEMI { 499 if (!dcs->d_nonempty_decl) { 500 /* empty declaration */ 501 warning(2); 502 } else { 503 /* '%s' declared in argument declaration list */ 504 warning(3, type_name(dcs->d_type)); 505 } 506 } 507 | declaration_specifiers deftyp type_init_decls T_SEMI { 508 if (dcs->d_nonempty_decl) { 509 /* '%s' declared in argument declaration list */ 510 warning(3, type_name(dcs->d_type)); 511 } 512 } 513 | declmods error 514 | declaration_specifiers error 515 ; 516 517 declaration: /* C99 6.7 */ 518 declmods deftyp T_SEMI { 519 if (dcs->d_scl == TYPEDEF) { 520 /* typedef declares no type name */ 521 warning(72); 522 } else { 523 /* empty declaration */ 524 warning(2); 525 } 526 } 527 | declmods deftyp notype_init_decls T_SEMI 528 | declaration_specifiers deftyp T_SEMI { 529 if (dcs->d_scl == TYPEDEF) { 530 /* typedef declares no type name */ 531 warning(72); 532 } else if (!dcs->d_nonempty_decl) { 533 /* empty declaration */ 534 warning(2); 535 } 536 } 537 | declaration_specifiers deftyp type_init_decls T_SEMI 538 | error T_SEMI 539 ; 540 541 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 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_sou_align_in_bits = 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 $$ = NULL; 798 } 799 ; 800 801 type_attribute_opt: 802 /* empty */ 803 | type_attribute 804 ; 805 806 member_declaration_list: 807 member_declaration 808 | member_declaration_list T_SEMI member_declaration { 809 $$ = 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 type_attribute_opt { 818 symtyp = FVFT; 819 $$ = $4; 820 } 821 | noclass_declspecs deftyp { 822 symtyp = FMEMBER; 823 } type_member_decls type_attribute_opt { 824 symtyp = FVFT; 825 $$ = $4; 826 } 827 | noclass_declmods deftyp type_attribute_opt { 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 lint_assert(is_struct_or_union(dcs->d_type->t_tspec)); 835 $$ = dcs->d_type->t_str->sou_first_member; 836 anonymize($$); 837 } 838 | noclass_declspecs deftyp type_attribute_opt { 839 symtyp = FVFT; 840 /* struct or union member must be named */ 841 if (!Sflag) 842 /* anonymous struct/union members is a C9X feature */ 843 warning(49); 844 if (is_struct_or_union(dcs->d_type->t_tspec)) { 845 $$ = dcs->d_type->t_str->sou_first_member; 846 /* add all the members of the anonymous struct/union */ 847 anonymize($$); 848 } else { 849 /* syntax error '%s' */ 850 error(249, "unnamed member"); 851 $$ = NULL; 852 } 853 } 854 | error { 855 symtyp = FVFT; 856 $$ = NULL; 857 } 858 ; 859 860 noclass_declspecs: 861 clrtyp_typespec { 862 add_type($1); 863 } 864 | type_attribute noclass_declspecs 865 | noclass_declmods typespec { 866 add_type($2); 867 } 868 | noclass_declspecs T_QUAL { 869 add_qualifier($2); 870 } 871 | noclass_declspecs notype_typespec { 872 add_type($2); 873 } 874 | noclass_declspecs type_attribute 875 ; 876 877 noclass_declmods: 878 clrtyp T_QUAL { 879 add_qualifier($2); 880 } 881 | noclass_declmods T_QUAL { 882 add_qualifier($2); 883 } 884 ; 885 886 notype_member_decls: 887 notype_member_decl { 888 $$ = declarator_1_struct_union($1); 889 } 890 | notype_member_decls { 891 symtyp = FMEMBER; 892 } T_COMMA type_member_decl { 893 $$ = lnklst($1, declarator_1_struct_union($4)); 894 } 895 ; 896 897 type_member_decls: 898 type_member_decl { 899 $$ = declarator_1_struct_union($1); 900 } 901 | type_member_decls { 902 symtyp = FMEMBER; 903 } T_COMMA type_member_decl { 904 $$ = lnklst($1, declarator_1_struct_union($4)); 905 } 906 ; 907 908 notype_member_decl: 909 notype_decl 910 | notype_decl T_COLON constant_expr { /* C99 6.7.2.1 */ 911 $$ = bitfield($1, to_int_constant($3, true)); 912 } 913 | { 914 symtyp = FVFT; 915 } T_COLON constant_expr { /* C99 6.7.2.1 */ 916 $$ = bitfield(NULL, to_int_constant($3, true)); 917 } 918 ; 919 920 type_member_decl: 921 type_decl 922 | type_decl T_COLON constant_expr { 923 $$ = bitfield($1, to_int_constant($3, true)); 924 } 925 | { 926 symtyp = FVFT; 927 } T_COLON constant_expr { 928 $$ = bitfield(NULL, to_int_constant($3, true)); 929 } 930 ; 931 932 enum_spec: 933 enum enum_tag { 934 $$ = mktag($2, ENUM, false, false); 935 } 936 | enum enum_tag { 937 dcs->d_tagtyp = mktag($2, ENUM, true, false); 938 } enum_declaration { 939 $$ = complete_tag_enum(dcs->d_tagtyp, $4); 940 } 941 | enum { 942 dcs->d_tagtyp = mktag(NULL, ENUM, true, false); 943 } enum_declaration { 944 $$ = complete_tag_enum(dcs->d_tagtyp, $3); 945 } 946 | enum error { 947 symtyp = FVFT; 948 $$ = gettyp(INT); 949 } 950 ; 951 952 enum: 953 T_ENUM { 954 symtyp = FTAG; 955 begin_declaration_level(CTCONST); 956 } 957 ; 958 959 enum_tag: 960 identifier { 961 $$ = getsym($1); 962 } 963 ; 964 965 enum_declaration: 966 enum_decl_lbrace enumerator_list enumerator_list_comma_opt T_RBRACE { 967 $$ = $2; 968 } 969 ; 970 971 enum_decl_lbrace: 972 T_LBRACE { 973 symtyp = FVFT; 974 enumval = 0; 975 } 976 ; 977 978 enumerator_list: /* C99 6.7.2.2 */ 979 enumerator 980 | enumerator_list T_COMMA enumerator { 981 $$ = lnklst($1, $3); 982 } 983 | error { 984 $$ = NULL; 985 } 986 ; 987 988 enumerator_list_comma_opt: 989 /* empty */ 990 | T_COMMA { 991 if (sflag) { 992 /* trailing ',' prohibited in enum declaration */ 993 error(54); 994 } else { 995 /* trailing ',' prohibited in enum declaration */ 996 c99ism(54); 997 } 998 } 999 ; 1000 1001 enumerator: /* C99 6.7.2.2 */ 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 $$ = getsym($1); 1013 } 1014 ; 1015 1016 1017 /* 1018 * For an explanation of 'notype' in the following rules, see the Bison 1019 * manual, section 7.1 "Semantic Info in Token Kinds". 1020 */ 1021 1022 notype_init_decls: 1023 notype_init_decl 1024 | notype_init_decls T_COMMA type_init_decl 1025 ; 1026 1027 type_init_decls: 1028 type_init_decl 1029 | type_init_decls T_COMMA type_init_decl 1030 ; 1031 1032 notype_init_decl: 1033 notype_decl asm_or_symbolrename_opt { 1034 cgram_declare($1, false, $2); 1035 check_size($1); 1036 } 1037 | notype_decl asm_or_symbolrename_opt { 1038 begin_initialization($1); 1039 cgram_declare($1, true, $2); 1040 } T_ASSIGN initializer { 1041 check_size($1); 1042 end_initialization(); 1043 } 1044 ; 1045 1046 type_init_decl: 1047 type_decl asm_or_symbolrename_opt { 1048 cgram_declare($1, false, $2); 1049 check_size($1); 1050 } 1051 | type_decl asm_or_symbolrename_opt { 1052 begin_initialization($1); 1053 cgram_declare($1, true, $2); 1054 } T_ASSIGN initializer { 1055 check_size($1); 1056 end_initialization(); 1057 } 1058 ; 1059 1060 notype_decl: 1061 notype_direct_decl 1062 | pointer notype_direct_decl { 1063 $$ = add_pointer($2, $1); 1064 } 1065 ; 1066 1067 type_decl: 1068 type_direct_decl 1069 | pointer type_direct_decl { 1070 $$ = add_pointer($2, $1); 1071 } 1072 ; 1073 1074 notype_direct_decl: 1075 T_NAME { 1076 $$ = declarator_name(getsym($1)); 1077 } 1078 | T_LPAREN type_decl T_RPAREN { 1079 $$ = $2; 1080 } 1081 | type_attribute notype_direct_decl { 1082 $$ = $2; 1083 } 1084 | notype_direct_decl T_LBRACK T_RBRACK { 1085 $$ = add_array($1, false, 0); 1086 } 1087 | notype_direct_decl T_LBRACK array_size T_RBRACK { 1088 $$ = add_array($1, true, to_int_constant($3, false)); 1089 } 1090 | notype_direct_decl param_list asm_or_symbolrename_opt { 1091 $$ = add_function(symbolrename($1, $3), $2); 1092 end_declaration_level(); 1093 block_level--; 1094 } 1095 | notype_direct_decl type_attribute 1096 ; 1097 1098 type_direct_decl: 1099 identifier { 1100 $$ = declarator_name(getsym($1)); 1101 } 1102 | T_LPAREN type_decl T_RPAREN { 1103 $$ = $2; 1104 } 1105 | type_attribute type_direct_decl { 1106 $$ = $2; 1107 } 1108 | type_direct_decl T_LBRACK T_RBRACK { 1109 $$ = add_array($1, false, 0); 1110 } 1111 | type_direct_decl T_LBRACK array_size T_RBRACK { 1112 $$ = add_array($1, true, to_int_constant($3, false)); 1113 } 1114 | type_direct_decl param_list asm_or_symbolrename_opt { 1115 $$ = add_function(symbolrename($1, $3), $2); 1116 end_declaration_level(); 1117 block_level--; 1118 } 1119 | type_direct_decl type_attribute 1120 ; 1121 1122 /* 1123 * The two distinct rules type_param_decl and notype_param_decl avoid a 1124 * conflict in argument lists. A typename enclosed in parentheses is always 1125 * treated as a typename, not an argument name. For example, after 1126 * "typedef double a;", the declaration "f(int (a));" is interpreted as 1127 * "f(int (double));", not "f(int a);". 1128 */ 1129 type_param_decl: 1130 direct_param_decl 1131 | pointer direct_param_decl { 1132 $$ = add_pointer($2, $1); 1133 } 1134 ; 1135 1136 notype_param_decl: 1137 direct_notype_param_decl 1138 | pointer direct_notype_param_decl { 1139 $$ = add_pointer($2, $1); 1140 } 1141 ; 1142 1143 direct_param_decl: 1144 identifier type_attribute_list { 1145 $$ = declarator_name(getsym($1)); 1146 } 1147 | identifier { 1148 $$ = declarator_name(getsym($1)); 1149 } 1150 | T_LPAREN notype_param_decl T_RPAREN { 1151 $$ = $2; 1152 } 1153 | direct_param_decl T_LBRACK T_RBRACK { 1154 $$ = add_array($1, false, 0); 1155 } 1156 | direct_param_decl T_LBRACK array_size T_RBRACK { 1157 $$ = add_array($1, true, to_int_constant($3, false)); 1158 } 1159 | direct_param_decl param_list asm_or_symbolrename_opt { 1160 $$ = add_function(symbolrename($1, $3), $2); 1161 end_declaration_level(); 1162 block_level--; 1163 } 1164 ; 1165 1166 direct_notype_param_decl: 1167 /* XXX: missing identifier type_attribute_list? */ 1168 identifier { 1169 $$ = declarator_name(getsym($1)); 1170 } 1171 | T_LPAREN notype_param_decl T_RPAREN { 1172 $$ = $2; 1173 } 1174 | direct_notype_param_decl T_LBRACK T_RBRACK { 1175 $$ = add_array($1, false, 0); 1176 } 1177 | direct_notype_param_decl T_LBRACK array_size T_RBRACK { 1178 $$ = add_array($1, true, to_int_constant($3, false)); 1179 } 1180 | direct_notype_param_decl param_list asm_or_symbolrename_opt { 1181 $$ = add_function(symbolrename($1, $3), $2); 1182 end_declaration_level(); 1183 block_level--; 1184 } 1185 ; 1186 1187 pointer: /* C99 6.7.5 */ 1188 asterisk type_qualifier_list_opt { 1189 $$ = merge_qualified_pointer($1, $2); 1190 } 1191 | asterisk type_qualifier_list_opt pointer { 1192 $$ = merge_qualified_pointer($1, $2); 1193 $$ = merge_qualified_pointer($$, $3); 1194 } 1195 ; 1196 1197 asterisk: 1198 T_ASTERISK { 1199 $$ = xcalloc(1, sizeof(*$$)); 1200 $$->p_pointer = true; 1201 } 1202 ; 1203 1204 type_qualifier_list_opt: 1205 /* empty */ { 1206 $$ = NULL; 1207 } 1208 | type_qualifier_list 1209 ; 1210 1211 type_qualifier_list: /* C99 6.7.5 */ 1212 type_qualifier 1213 | type_qualifier_list type_qualifier { 1214 $$ = merge_qualified_pointer($1, $2); 1215 } 1216 ; 1217 1218 type_qualifier: 1219 T_QUAL { 1220 $$ = xcalloc(1, sizeof(*$$)); 1221 if ($1 == CONST) { 1222 $$->p_const = true; 1223 } else if ($1 == VOLATILE) { 1224 $$->p_volatile = true; 1225 } else { 1226 lint_assert($1 == RESTRICT || $1 == THREAD); 1227 } 1228 } 1229 ; 1230 1231 param_list: 1232 id_list_lparen identifier_list T_RPAREN { 1233 $$ = $2; 1234 } 1235 | abstract_decl_param_list 1236 ; 1237 1238 id_list_lparen: 1239 T_LPAREN { 1240 block_level++; 1241 begin_declaration_level(PROTO_ARG); 1242 } 1243 ; 1244 1245 identifier_list: 1246 T_NAME { 1247 $$ = old_style_function_name(getsym($1)); 1248 } 1249 | identifier_list T_COMMA T_NAME { 1250 $$ = lnklst($1, old_style_function_name(getsym($3))); 1251 } 1252 | identifier_list error 1253 ; 1254 1255 abstract_decl_param_list: 1256 abstract_decl_lparen T_RPAREN type_attribute_opt { 1257 $$ = NULL; 1258 } 1259 | abstract_decl_lparen vararg_parameter_type_list T_RPAREN type_attribute_opt { 1260 dcs->d_proto = true; 1261 $$ = $2; 1262 } 1263 | abstract_decl_lparen error T_RPAREN type_attribute_opt { 1264 $$ = NULL; 1265 } 1266 ; 1267 1268 abstract_decl_lparen: 1269 T_LPAREN { 1270 block_level++; 1271 begin_declaration_level(PROTO_ARG); 1272 } 1273 ; 1274 1275 vararg_parameter_type_list: 1276 parameter_type_list 1277 | parameter_type_list T_COMMA T_ELLIPSIS { 1278 dcs->d_vararg = true; 1279 $$ = $1; 1280 } 1281 | T_ELLIPSIS { 1282 if (sflag) { 1283 /* ANSI C requires formal parameter before '...' */ 1284 error(84); 1285 } else if (!tflag) { 1286 /* ANSI C requires formal parameter before '...' */ 1287 warning(84); 1288 } 1289 dcs->d_vararg = true; 1290 $$ = NULL; 1291 } 1292 ; 1293 1294 parameter_type_list: 1295 parameter_declaration 1296 | parameter_type_list T_COMMA parameter_declaration { 1297 $$ = lnklst($1, $3); 1298 } 1299 ; 1300 1301 /* XXX: C99 6.7.5 defines the same name, but it looks completely different. */ 1302 parameter_declaration: 1303 declmods deftyp { 1304 $$ = declare_argument(abstract_name(), false); 1305 } 1306 | declaration_specifiers deftyp { 1307 $$ = declare_argument(abstract_name(), false); 1308 } 1309 | declmods deftyp notype_param_decl { 1310 $$ = declare_argument($3, false); 1311 } 1312 | declaration_specifiers deftyp type_param_decl { 1313 $$ = declare_argument($3, false); 1314 } 1315 | declmods deftyp abstract_declarator { 1316 $$ = declare_argument($3, false); 1317 } 1318 | declaration_specifiers deftyp abstract_declarator { 1319 $$ = declare_argument($3, false); 1320 } 1321 ; 1322 1323 asm_or_symbolrename_opt: /* expect only one */ 1324 /* empty */ { 1325 $$ = NULL; 1326 } 1327 | T_ASM T_LPAREN T_STRING T_RPAREN { 1328 freeyyv(&$3, T_STRING); 1329 $$ = NULL; 1330 } 1331 | T_SYMBOLRENAME T_LPAREN T_NAME T_RPAREN { 1332 $$ = $3; 1333 } 1334 ; 1335 1336 initializer: /* C99 6.7.8 "Initialization" */ 1337 expr %prec T_COMMA { 1338 init_expr($1); 1339 } 1340 | init_lbrace init_rbrace { 1341 /* XXX: Empty braces are not covered by C99 6.7.8. */ 1342 } 1343 | init_lbrace initializer_list comma_opt init_rbrace 1344 | error 1345 ; 1346 1347 initializer_list: /* C99 6.7.8 "Initialization" */ 1348 initializer_list_item 1349 | initializer_list T_COMMA initializer_list_item 1350 ; 1351 1352 initializer_list_item: 1353 designation initializer 1354 | initializer 1355 ; 1356 1357 designation: /* C99 6.7.8 "Initialization" */ 1358 designator_list T_ASSIGN 1359 | identifier T_COLON { 1360 /* GCC style struct or union member name in initializer */ 1361 gnuism(315); 1362 add_designator_member($1); 1363 } 1364 ; 1365 1366 designator_list: /* C99 6.7.8 "Initialization" */ 1367 designator 1368 | designator_list designator 1369 ; 1370 1371 designator: /* C99 6.7.8 "Initialization" */ 1372 T_LBRACK range T_RBRACK { 1373 add_designator_subscript($2); 1374 if (!Sflag) 1375 /* array initializer with des.s is a C9X feature */ 1376 warning(321); 1377 } 1378 | T_POINT identifier { 1379 if (!Sflag) 1380 /* struct or union member name in initializer is ... */ 1381 warning(313); 1382 add_designator_member($2); 1383 } 1384 ; 1385 1386 range: 1387 constant_expr { 1388 $$.lo = to_int_constant($1, true); 1389 $$.hi = $$.lo; 1390 } 1391 | constant_expr T_ELLIPSIS constant_expr { 1392 $$.lo = to_int_constant($1, true); 1393 $$.hi = to_int_constant($3, true); 1394 /* initialization with '[a...b]' is a GCC extension */ 1395 gnuism(340); 1396 } 1397 ; 1398 1399 init_lbrace: 1400 T_LBRACE { 1401 init_lbrace(); 1402 } 1403 ; 1404 1405 init_rbrace: 1406 T_RBRACE { 1407 init_rbrace(); 1408 } 1409 ; 1410 1411 type_name: /* C99 6.7.6 */ 1412 { 1413 begin_declaration_level(ABSTRACT); 1414 } abstract_declaration { 1415 end_declaration_level(); 1416 $$ = $2->s_type; 1417 } 1418 ; 1419 1420 abstract_declaration: 1421 noclass_declmods deftyp { 1422 $$ = declare_1_abstract(abstract_name()); 1423 } 1424 | noclass_declspecs deftyp { 1425 $$ = declare_1_abstract(abstract_name()); 1426 } 1427 | noclass_declmods deftyp abstract_declarator { 1428 $$ = declare_1_abstract($3); 1429 } 1430 | noclass_declspecs deftyp abstract_declarator { 1431 $$ = declare_1_abstract($3); 1432 } 1433 ; 1434 1435 abstract_declarator: /* C99 6.7.6 */ 1436 pointer { 1437 $$ = add_pointer(abstract_name(), $1); 1438 } 1439 | direct_abstract_declarator 1440 | pointer direct_abstract_declarator { 1441 $$ = add_pointer($2, $1); 1442 } 1443 | T_TYPEOF term { /* GCC extension */ 1444 $$ = mktempsym($2->tn_type); 1445 } 1446 ; 1447 1448 direct_abstract_declarator: /* C99 6.7.6 */ 1449 T_LPAREN abstract_declarator T_RPAREN { 1450 $$ = $2; 1451 } 1452 | T_LBRACK T_RBRACK { 1453 $$ = add_array(abstract_name(), false, 0); 1454 } 1455 | T_LBRACK array_size T_RBRACK { 1456 $$ = add_array(abstract_name(), true, to_int_constant($2, false)); 1457 } 1458 | type_attribute direct_abstract_declarator { 1459 $$ = $2; 1460 } 1461 | direct_abstract_declarator T_LBRACK T_RBRACK { 1462 $$ = add_array($1, false, 0); 1463 } 1464 | direct_abstract_declarator T_LBRACK T_ASTERISK T_RBRACK { /* C99 */ 1465 $$ = add_array($1, false, 0); 1466 } 1467 | direct_abstract_declarator T_LBRACK array_size T_RBRACK { 1468 $$ = add_array($1, true, to_int_constant($3, false)); 1469 } 1470 | abstract_decl_param_list asm_or_symbolrename_opt { 1471 $$ = add_function(symbolrename(abstract_name(), $2), $1); 1472 end_declaration_level(); 1473 block_level--; 1474 } 1475 | direct_abstract_declarator abstract_decl_param_list asm_or_symbolrename_opt { 1476 $$ = add_function(symbolrename($1, $3), $2); 1477 end_declaration_level(); 1478 block_level--; 1479 } 1480 | direct_abstract_declarator type_attribute 1481 ; 1482 1483 array_size: 1484 type_qualifier_list_opt T_SCLASS constant_expr { 1485 /* C11 6.7.6.3p7 */ 1486 if ($2 != STATIC) 1487 yyerror("Bad attribute"); 1488 /* static array size is a C11 extension */ 1489 c11ism(343); 1490 $$ = $3; 1491 } 1492 | constant_expr 1493 ; 1494 1495 non_expr_statement: 1496 type_attribute T_SEMI 1497 | labeled_statement 1498 | compound_statement 1499 | selection_statement 1500 | iteration_statement 1501 | jump_statement { 1502 seen_fallthrough = false; 1503 } 1504 | asm_statement 1505 ; 1506 1507 statement: /* C99 6.8 */ 1508 expr_statement 1509 | non_expr_statement 1510 ; 1511 1512 labeled_statement: /* C99 6.8.1 */ 1513 label type_attribute_opt statement 1514 ; 1515 1516 label: 1517 T_NAME T_COLON { 1518 symtyp = FLABEL; 1519 named_label(getsym($1)); 1520 } 1521 | T_CASE constant_expr T_COLON { 1522 case_label($2); 1523 seen_fallthrough = true; 1524 } 1525 | T_CASE constant_expr T_ELLIPSIS constant_expr T_COLON { 1526 /* XXX: We don't fill all cases */ 1527 case_label($2); 1528 seen_fallthrough = true; 1529 } 1530 | T_DEFAULT T_COLON { 1531 default_label(); 1532 seen_fallthrough = true; 1533 } 1534 ; 1535 1536 compound_statement: /* C99 6.8.2 */ 1537 compound_statement_lbrace compound_statement_rbrace 1538 | compound_statement_lbrace block_item_list compound_statement_rbrace 1539 ; 1540 1541 compound_statement_lbrace: 1542 T_LBRACE { 1543 block_level++; 1544 mem_block_level++; 1545 begin_declaration_level(AUTO); 1546 } 1547 ; 1548 1549 compound_statement_rbrace: 1550 T_RBRACE { 1551 end_declaration_level(); 1552 freeblk(); 1553 mem_block_level--; 1554 block_level--; 1555 seen_fallthrough = false; 1556 } 1557 ; 1558 1559 block_item_list: 1560 block_item 1561 | block_item_list block_item { 1562 if (!Sflag && $1 && !$2) 1563 /* declarations after statements is a C99 feature */ 1564 c99ism(327); 1565 $$ = $1 || $2; 1566 } 1567 ; 1568 1569 block_item: 1570 statement { 1571 $$ = true; 1572 restore_warning_flags(); 1573 } 1574 | declaration { 1575 $$ = false; 1576 restore_warning_flags(); 1577 } 1578 ; 1579 1580 expr_statement: 1581 expr T_SEMI { 1582 expr($1, false, false, false, false); 1583 seen_fallthrough = false; 1584 } 1585 | T_SEMI { 1586 seen_fallthrough = false; 1587 } 1588 ; 1589 1590 selection_statement: /* C99 6.8.4 */ 1591 if_without_else { 1592 save_warning_flags(); 1593 if2(); 1594 if3(false); 1595 } 1596 | if_without_else T_ELSE { 1597 save_warning_flags(); 1598 if2(); 1599 } statement { 1600 clear_warning_flags(); 1601 if3(true); 1602 } 1603 | if_without_else T_ELSE error { 1604 clear_warning_flags(); 1605 if3(false); 1606 } 1607 | switch_expr statement { 1608 clear_warning_flags(); 1609 switch2(); 1610 } 1611 | switch_expr error { 1612 clear_warning_flags(); 1613 switch2(); 1614 } 1615 ; 1616 1617 if_without_else: 1618 if_expr statement 1619 | if_expr error 1620 ; 1621 1622 if_expr: 1623 T_IF T_LPAREN expr T_RPAREN { 1624 if1($3); 1625 clear_warning_flags(); 1626 } 1627 ; 1628 1629 switch_expr: 1630 T_SWITCH T_LPAREN expr T_RPAREN { 1631 switch1($3); 1632 clear_warning_flags(); 1633 } 1634 ; 1635 1636 generic_selection: /* C11 6.5.1.1 */ 1637 T_GENERIC T_LPAREN assignment_expression T_COMMA 1638 generic_assoc_list T_RPAREN { 1639 /* generic selection requires C11 or later */ 1640 c11ism(345); 1641 $$ = build_generic_selection($3, $5); 1642 } 1643 ; 1644 1645 generic_assoc_list: /* C11 6.5.1.1 */ 1646 generic_association 1647 | generic_assoc_list T_COMMA generic_association { 1648 $3->ga_prev = $1; 1649 $$ = $3; 1650 } 1651 ; 1652 1653 generic_association: /* C11 6.5.1.1 */ 1654 type_name T_COLON assignment_expression { 1655 $$ = getblk(sizeof(*$$)); 1656 $$->ga_arg = $1; 1657 $$->ga_result = $3; 1658 } 1659 | T_DEFAULT T_COLON assignment_expression { 1660 $$ = getblk(sizeof(*$$)); 1661 $$->ga_arg = NULL; 1662 $$->ga_result = $3; 1663 } 1664 ; 1665 1666 do_statement: /* C99 6.8.5 */ 1667 do statement { 1668 clear_warning_flags(); 1669 } 1670 ; 1671 1672 iteration_statement: /* C99 6.8.5 */ 1673 while_expr statement { 1674 clear_warning_flags(); 1675 while2(); 1676 } 1677 | while_expr error { 1678 clear_warning_flags(); 1679 while2(); 1680 } 1681 | do_statement do_while_expr { 1682 do2($2); 1683 seen_fallthrough = false; 1684 } 1685 | do error { 1686 clear_warning_flags(); 1687 do2(NULL); 1688 } 1689 | for_exprs statement { 1690 clear_warning_flags(); 1691 for2(); 1692 end_declaration_level(); 1693 block_level--; 1694 } 1695 | for_exprs error { 1696 clear_warning_flags(); 1697 for2(); 1698 end_declaration_level(); 1699 block_level--; 1700 } 1701 ; 1702 1703 while_expr: 1704 T_WHILE T_LPAREN expr T_RPAREN { 1705 while1($3); 1706 clear_warning_flags(); 1707 } 1708 ; 1709 1710 do: 1711 T_DO { 1712 do1(); 1713 } 1714 ; 1715 1716 do_while_expr: 1717 T_WHILE T_LPAREN expr T_RPAREN T_SEMI { 1718 $$ = $3; 1719 } 1720 ; 1721 1722 for_start: 1723 T_FOR T_LPAREN { 1724 begin_declaration_level(AUTO); 1725 block_level++; 1726 } 1727 ; 1728 1729 for_exprs: 1730 for_start declaration_specifiers deftyp notype_init_decls T_SEMI 1731 expr_opt T_SEMI expr_opt T_RPAREN { 1732 /* variable declaration in for loop */ 1733 c99ism(325); 1734 for1(NULL, $6, $8); 1735 clear_warning_flags(); 1736 } 1737 | for_start expr_opt T_SEMI expr_opt T_SEMI expr_opt T_RPAREN { 1738 for1($2, $4, $6); 1739 clear_warning_flags(); 1740 } 1741 ; 1742 1743 expr_opt: 1744 /* empty */ { 1745 $$ = NULL; 1746 } 1747 | expr 1748 ; 1749 1750 jump_statement: /* C99 6.8.6 */ 1751 goto identifier T_SEMI { 1752 do_goto(getsym($2)); 1753 } 1754 | goto error T_SEMI { 1755 symtyp = FVFT; 1756 } 1757 | T_CONTINUE T_SEMI { 1758 do_continue(); 1759 } 1760 | T_BREAK T_SEMI { 1761 do_break(); 1762 } 1763 | T_RETURN T_SEMI { 1764 do_return(NULL); 1765 } 1766 | T_RETURN expr T_SEMI { 1767 do_return($2); 1768 } 1769 ; 1770 1771 goto: 1772 T_GOTO { 1773 symtyp = FLABEL; 1774 } 1775 ; 1776 1777 asm_statement: 1778 T_ASM T_LPAREN read_until_rparen T_SEMI { 1779 setasm(); 1780 } 1781 | T_ASM T_QUAL T_LPAREN read_until_rparen T_SEMI { 1782 setasm(); 1783 } 1784 | T_ASM error 1785 ; 1786 1787 read_until_rparen: 1788 /* empty */ { 1789 ignore_up_to_rparen(); 1790 } 1791 ; 1792 1793 constant_expr_list_opt: 1794 /* empty */ 1795 | constant_expr_list 1796 ; 1797 1798 constant_expr_list: 1799 constant_expr 1800 | constant_expr_list T_COMMA constant_expr 1801 ; 1802 1803 constant_expr: /* C99 6.6 */ 1804 expr %prec T_ASSIGN 1805 ; 1806 1807 expr: 1808 expr T_ASTERISK expr { 1809 $$ = build(MULT, $1, $3); 1810 } 1811 | expr T_MULTIPLICATIVE expr { 1812 $$ = build($2, $1, $3); 1813 } 1814 | expr T_ADDITIVE expr { 1815 $$ = build($2, $1, $3); 1816 } 1817 | expr T_SHIFT expr { 1818 $$ = build($2, $1, $3); 1819 } 1820 | expr T_RELATIONAL expr { 1821 $$ = build($2, $1, $3); 1822 } 1823 | expr T_EQUALITY expr { 1824 $$ = build($2, $1, $3); 1825 } 1826 | expr T_AMPER expr { 1827 $$ = build(BITAND, $1, $3); 1828 } 1829 | expr T_BITXOR expr { 1830 $$ = build(BITXOR, $1, $3); 1831 } 1832 | expr T_BITOR expr { 1833 $$ = build(BITOR, $1, $3); 1834 } 1835 | expr T_LOGAND expr { 1836 $$ = build(LOGAND, $1, $3); 1837 } 1838 | expr T_LOGOR expr { 1839 $$ = build(LOGOR, $1, $3); 1840 } 1841 | expr T_QUEST expr T_COLON expr { 1842 $$ = build(QUEST, $1, build(COLON, $3, $5)); 1843 } 1844 | expr T_ASSIGN expr { 1845 $$ = build(ASSIGN, $1, $3); 1846 } 1847 | expr T_OPASSIGN expr { 1848 $$ = build($2, $1, $3); 1849 } 1850 | expr T_COMMA expr { 1851 $$ = build(COMMA, $1, $3); 1852 } 1853 | term 1854 | generic_selection 1855 ; 1856 1857 assignment_expression: /* C99 6.5.16 */ 1858 expr %prec T_ASSIGN 1859 ; 1860 1861 term: 1862 T_NAME { 1863 /* XXX really necessary? */ 1864 if (yychar < 0) 1865 yychar = yylex(); 1866 $$ = new_name_node(getsym($1), yychar); 1867 } 1868 | string { 1869 $$ = new_string_node($1); 1870 } 1871 | T_CON { 1872 $$ = expr_new_constant(gettyp($1->v_tspec), $1); 1873 } 1874 | T_LPAREN expr T_RPAREN { 1875 if ($2 != NULL) 1876 $2->tn_parenthesized = true; 1877 $$ = $2; 1878 } 1879 | T_LPAREN compound_statement_lbrace gcc_statement_expr_list { 1880 block_level--; 1881 mem_block_level--; 1882 begin_initialization(mktempsym(dup_type($3->tn_type))); 1883 mem_block_level++; 1884 block_level++; 1885 /* ({ }) is a GCC extension */ 1886 gnuism(320); 1887 } compound_statement_rbrace T_RPAREN { 1888 $$ = new_name_node(*current_initsym(), 0); 1889 end_initialization(); 1890 } 1891 | term T_INCDEC { 1892 $$ = build($2 == INC ? INCAFT : DECAFT, $1, NULL); 1893 } 1894 | T_INCDEC term { 1895 $$ = build($1 == INC ? INCBEF : DECBEF, $2, NULL); 1896 } 1897 | T_ASTERISK term { 1898 $$ = build(INDIR, $2, NULL); 1899 } 1900 | T_AMPER term { 1901 $$ = build(ADDR, $2, NULL); 1902 } 1903 | T_UNARY term { 1904 $$ = build($1, $2, NULL); 1905 } 1906 | T_ADDITIVE term { 1907 if (tflag && $1 == PLUS) { 1908 /* unary + is illegal in traditional C */ 1909 warning(100); 1910 } 1911 $$ = build($1 == PLUS ? UPLUS : UMINUS, $2, NULL); 1912 } 1913 | term T_LBRACK expr T_RBRACK { 1914 $$ = build(INDIR, build(PLUS, $1, $3), NULL); 1915 } 1916 | term T_LPAREN T_RPAREN { 1917 $$ = new_function_call_node($1, NULL); 1918 } 1919 | term T_LPAREN func_arg_list T_RPAREN { 1920 $$ = new_function_call_node($1, $3); 1921 } 1922 | term point_or_arrow T_NAME { 1923 if ($1 != NULL) { 1924 sym_t *msym; 1925 /* 1926 * XXX struct_or_union_member should be integrated 1927 * in build() 1928 */ 1929 if ($2 == ARROW) { 1930 /* 1931 * must do this before struct_or_union_member 1932 * is called 1933 */ 1934 $1 = cconv($1); 1935 } 1936 msym = struct_or_union_member($1, $2, getsym($3)); 1937 $$ = build($2, $1, new_name_node(msym, 0)); 1938 } else { 1939 $$ = NULL; 1940 } 1941 } 1942 | T_REAL term { 1943 $$ = build(REAL, $2, NULL); 1944 } 1945 | T_IMAG term { 1946 $$ = build(IMAG, $2, NULL); 1947 } 1948 | T_EXTENSION term { 1949 $$ = $2; 1950 } 1951 | T_REAL T_LPAREN term T_RPAREN { 1952 $$ = build(REAL, $3, NULL); 1953 } 1954 | T_IMAG T_LPAREN term T_RPAREN { 1955 $$ = build(IMAG, $3, NULL); 1956 } 1957 | T_BUILTIN_OFFSETOF T_LPAREN type_name T_COMMA identifier T_RPAREN { 1958 symtyp = FMEMBER; 1959 $$ = build_offsetof($3, getsym($5)); 1960 } 1961 | T_SIZEOF term { 1962 $$ = $2 == NULL ? NULL : build_sizeof($2->tn_type); 1963 if ($$ != NULL) 1964 check_expr_misc($2, false, false, false, false, false, true); 1965 } 1966 | T_SIZEOF T_LPAREN type_name T_RPAREN %prec T_SIZEOF { 1967 $$ = build_sizeof($3); 1968 } 1969 | T_ALIGNOF T_LPAREN type_name T_RPAREN { 1970 $$ = build_alignof($3); 1971 } 1972 | T_LPAREN type_name T_RPAREN term %prec T_UNARY { 1973 $$ = cast($4, $2); 1974 } 1975 | T_LPAREN type_name T_RPAREN { /* C99 6.5.2.5 "Compound literals" */ 1976 sym_t *tmp = mktempsym($2); 1977 begin_initialization(tmp); 1978 cgram_declare(tmp, true, NULL); 1979 } init_lbrace initializer_list comma_opt init_rbrace { 1980 if (!Sflag) 1981 /* compound literals are a C9X/GCC extension */ 1982 gnuism(319); 1983 $$ = new_name_node(*current_initsym(), 0); 1984 end_initialization(); 1985 } 1986 ; 1987 1988 /* 1989 * The inner part of a GCC statement-expression of the form ({ ... }). 1990 * 1991 * https://gcc.gnu.org/onlinedocs/gcc/Statement-Exprs.html 1992 */ 1993 gcc_statement_expr_list: 1994 gcc_statement_expr_item 1995 | gcc_statement_expr_list gcc_statement_expr_item { 1996 $$ = $2; 1997 } 1998 ; 1999 2000 gcc_statement_expr_item: 2001 declaration { 2002 clear_warning_flags(); 2003 $$ = NULL; 2004 } 2005 | non_expr_statement { 2006 $$ = expr_zalloc_tnode(); 2007 $$->tn_type = gettyp(VOID); 2008 } 2009 | expr T_SEMI { 2010 if ($1 == NULL) { /* in case of syntax errors */ 2011 $$ = expr_zalloc_tnode(); 2012 $$->tn_type = gettyp(VOID); 2013 } else { 2014 /* XXX: do that only on the last name */ 2015 if ($1->tn_op == NAME) 2016 $1->tn_sym->s_used = true; 2017 $$ = $1; 2018 expr($1, false, false, false, false); 2019 seen_fallthrough = false; 2020 } 2021 } 2022 ; 2023 2024 string: 2025 T_STRING 2026 | T_STRING string2 { 2027 $$ = cat_strings($1, $2); 2028 } 2029 ; 2030 2031 string2: 2032 T_STRING { 2033 if (tflag) { 2034 /* concatenated strings are illegal in traditional C */ 2035 warning(219); 2036 } 2037 $$ = $1; 2038 } 2039 | string2 T_STRING { 2040 $$ = cat_strings($1, $2); 2041 } 2042 ; 2043 2044 func_arg_list: 2045 expr %prec T_COMMA { 2046 $$ = new_function_argument_node(NULL, $1); 2047 } 2048 | func_arg_list T_COMMA expr { 2049 $$ = new_function_argument_node($1, $3); 2050 } 2051 ; 2052 2053 point_or_arrow: 2054 T_POINT { 2055 symtyp = FMEMBER; 2056 $$ = POINT; 2057 } 2058 | T_ARROW { 2059 symtyp = FMEMBER; 2060 $$ = ARROW; 2061 } 2062 ; 2063 2064 identifier: /* C99 6.4.2.1 */ 2065 T_NAME { 2066 $$ = $1; 2067 cgram_debug("name '%s'", $$->sb_name); 2068 } 2069 | T_TYPENAME { 2070 $$ = $1; 2071 cgram_debug("typename '%s'", $$->sb_name); 2072 } 2073 ; 2074 2075 comma_opt: 2076 /* empty */ 2077 | T_COMMA 2078 ; 2079 2080 %% 2081 2082 /* ARGSUSED */ 2083 int 2084 yyerror(const char *msg) 2085 { 2086 /* syntax error '%s' */ 2087 error(249, yytext); 2088 if (++sytxerr >= 5) 2089 norecover(); 2090 return 0; 2091 } 2092 2093 static void 2094 cgram_declare(sym_t *decl, bool initflg, sbuf_t *renaming) 2095 { 2096 declare(decl, initflg, renaming); 2097 if (renaming != NULL) 2098 freeyyv(&renaming, T_NAME); 2099 } 2100 2101 /* 2102 * Discard all input tokens up to and including the next 2103 * unmatched right paren 2104 */ 2105 static void 2106 ignore_up_to_rparen(void) 2107 { 2108 int level; 2109 2110 if (yychar < 0) 2111 yychar = yylex(); 2112 freeyyv(&yylval, yychar); 2113 2114 level = 1; 2115 while (yychar != T_RPAREN || --level > 0) { 2116 if (yychar == T_LPAREN) { 2117 level++; 2118 } else if (yychar <= 0) { 2119 break; 2120 } 2121 freeyyv(&yylval, yychar = yylex()); 2122 } 2123 2124 yyclearin; 2125 } 2126 2127 static sym_t * 2128 symbolrename(sym_t *s, sbuf_t *sb) 2129 { 2130 if (sb != NULL) 2131 s->s_rename = sb->sb_name; 2132 return s; 2133 } 2134
Indexes created Thu Oct 02 14:10:14 GMT 2025