cgram.y revision 1.244
1 %{ 2 /* $NetBSD: cgram.y,v 1.244 2021/06/28 09:01:48 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 1.244 2021/06/28 09:01:48 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_types *y_types; 143 }; 144 145 %token T_LBRACE T_RBRACE T_LBRACK T_RBRACK T_LPAREN T_RPAREN 146 %token T_POINT T_ARROW 147 %token <y_op> T_UNARY 148 %token <y_op> T_INCDEC 149 %token T_SIZEOF 150 %token T_BUILTIN_OFFSETOF 151 %token T_TYPEOF 152 %token T_EXTENSION 153 %token T_ALIGNAS 154 %token T_ALIGNOF 155 %token T_ASTERISK 156 %token <y_op> T_MULTIPLICATIVE 157 %token <y_op> T_ADDITIVE 158 %token <y_op> T_SHIFT 159 %token <y_op> T_RELATIONAL 160 %token <y_op> T_EQUALITY 161 %token T_AMPER 162 %token T_BITXOR 163 %token T_BITOR 164 %token T_LOGAND 165 %token T_LOGOR 166 %token T_QUEST 167 %token T_COLON 168 %token T_ASSIGN 169 %token <y_op> T_OPASSIGN 170 %token T_COMMA 171 %token T_SEMI 172 %token T_ELLIPSIS 173 %token T_REAL 174 %token T_IMAG 175 %token T_GENERIC 176 %token T_NORETURN 177 178 /* storage classes (extern, static, auto, register and typedef) */ 179 %token <y_scl> T_SCLASS 180 181 /* 182 * predefined type keywords (char, int, short, long, unsigned, signed, 183 * float, double, void); see T_TYPENAME 184 */ 185 %token <y_tspec> T_TYPE 186 187 /* qualifiers (const, volatile, restrict, _Thread_local) */ 188 %token <y_tqual> T_QUAL 189 190 /* struct or union */ 191 %token <y_tspec> T_STRUCT_OR_UNION 192 193 /* remaining keywords */ 194 %token T_ASM 195 %token T_BREAK 196 %token T_CASE 197 %token T_CONTINUE 198 %token T_DEFAULT 199 %token T_DO 200 %token T_ELSE 201 %token T_ENUM 202 %token T_FOR 203 %token T_GOTO 204 %token T_IF 205 %token T_PACKED 206 %token T_RETURN 207 %token T_SWITCH 208 %token T_SYMBOLRENAME 209 %token T_WHILE 210 /* Type Attributes */ 211 %token <y_type> T_ATTRIBUTE 212 %token <y_type> T_AT_ALIAS 213 %token <y_type> T_AT_ALIGNED 214 %token <y_type> T_AT_ALLOC_SIZE 215 %token <y_type> T_AT_ALWAYS_INLINE 216 %token <y_type> T_AT_BOUNDED 217 %token <y_type> T_AT_BUFFER 218 %token <y_type> T_AT_COLD 219 %token <y_type> T_AT_COMMON 220 %token <y_type> T_AT_CONSTRUCTOR 221 %token <y_type> T_AT_DEPRECATED 222 %token <y_type> T_AT_DESTRUCTOR 223 %token <y_type> T_AT_FALLTHROUGH 224 %token <y_type> T_AT_FORMAT 225 %token <y_type> T_AT_FORMAT_ARG 226 %token <y_type> T_AT_FORMAT_GNU_PRINTF 227 %token <y_type> T_AT_FORMAT_PRINTF 228 %token <y_type> T_AT_FORMAT_SCANF 229 %token <y_type> T_AT_FORMAT_STRFMON 230 %token <y_type> T_AT_FORMAT_STRFTIME 231 %token <y_type> T_AT_FORMAT_SYSLOG 232 %token <y_type> T_AT_GNU_INLINE 233 %token <y_type> T_AT_MALLOC 234 %token <y_type> T_AT_MAY_ALIAS 235 %token <y_type> T_AT_MINBYTES 236 %token <y_type> T_AT_MODE 237 %token <y_type> T_AT_NOINLINE 238 %token <y_type> T_AT_NONNULL 239 %token <y_type> T_AT_NONSTRING 240 %token <y_type> T_AT_NORETURN 241 %token <y_type> T_AT_NOTHROW 242 %token <y_type> T_AT_NO_INSTRUMENT_FUNCTION 243 %token <y_type> T_AT_OPTIMIZE 244 %token <y_type> T_AT_PACKED 245 %token <y_type> T_AT_PCS 246 %token <y_type> T_AT_PURE 247 %token <y_type> T_AT_RETURNS_TWICE 248 %token <y_type> T_AT_SECTION 249 %token <y_type> T_AT_SENTINEL 250 %token <y_type> T_AT_STRING 251 %token <y_type> T_AT_TLS_MODEL 252 %token <y_type> T_AT_TUNION 253 %token <y_type> T_AT_UNUSED 254 %token <y_type> T_AT_USED 255 %token <y_type> T_AT_VISIBILITY 256 %token <y_type> T_AT_WARN_UNUSED_RESULT 257 %token <y_type> T_AT_WEAK 258 259 %left T_COMMA 260 %right T_ASSIGN T_OPASSIGN 261 %right T_QUEST T_COLON 262 %left T_LOGOR 263 %left T_LOGAND 264 %left T_BITOR 265 %left T_BITXOR 266 %left T_AMPER 267 %left T_EQUALITY 268 %left T_RELATIONAL 269 %left T_SHIFT 270 %left T_ADDITIVE 271 %left T_ASTERISK T_MULTIPLICATIVE 272 %right T_UNARY T_INCDEC T_SIZEOF T_REAL T_IMAG 273 %left T_LPAREN T_LBRACK T_POINT T_ARROW 274 275 %token <y_sb> T_NAME 276 %token <y_sb> T_TYPENAME 277 %token <y_val> T_CON 278 %token <y_string> T_STRING 279 280 %type <y_sym> func_decl 281 %type <y_sym> notype_decl 282 %type <y_sym> type_decl 283 %type <y_type> typespec 284 %type <y_type> clrtyp_typespec 285 %type <y_type> notype_typespec 286 %type <y_type> struct_spec 287 %type <y_type> enum_spec 288 %type <y_sym> struct_tag 289 %type <y_sym> enum_tag 290 %type <y_tspec> struct 291 %type <y_sym> struct_declaration 292 %type <y_sb> identifier 293 %type <y_sym> member_declaration_list_with_rbrace 294 %type <y_sym> member_declaration_list 295 %type <y_sym> member_declaration 296 %type <y_sym> notype_member_decls 297 %type <y_sym> type_member_decls 298 %type <y_sym> notype_member_decl 299 %type <y_sym> type_member_decl 300 %type <y_tnode> constant_expr 301 %type <y_tnode> array_size 302 %type <y_sym> enum_declaration 303 %type <y_sym> enums_with_opt_comma 304 %type <y_sym> enums 305 %type <y_sym> enumerator 306 %type <y_sym> enumeration_constant 307 %type <y_sym> notype_direct_decl 308 %type <y_sym> type_direct_decl 309 %type <y_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 318 %type <y_qual_ptr> type_qualifier 319 %type <y_sym> identifier_list 320 %type <y_sym> abstract_decl 321 %type <y_sym> direct_abstract_decl 322 %type <y_sym> vararg_parameter_type_list 323 %type <y_sym> parameter_type_list 324 %type <y_sym> parameter_declaration 325 %type <y_tnode> expr 326 %type <y_tnode> assignment_expression 327 %type <y_tnode> gcc_statement_expr_list 328 %type <y_tnode> gcc_statement_expr_item 329 %type <y_tnode> term 330 %type <y_tnode> generic_selection 331 %type <y_tnode> func_arg_list 332 %type <y_op> point_or_arrow 333 %type <y_type> type_name 334 %type <y_sym> abstract_declaration 335 %type <y_tnode> do_while_expr 336 %type <y_tnode> 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_types> generic_assoc_list 344 %type <y_types> generic_association 345 346 347 %% 348 349 program: 350 /* empty */ { 351 if (sflag) { 352 /* empty translation unit */ 353 error(272); 354 } else if (!tflag) { 355 /* empty translation unit */ 356 warning(272); 357 } 358 } 359 | translation_unit 360 ; 361 362 translation_unit: /* C99 6.9 */ 363 external_declaration 364 | translation_unit external_declaration 365 ; 366 367 external_declaration: /* C99 6.9 */ 368 asm_statement 369 | function_definition { 370 global_clean_up_decl(false); 371 clear_warning_flags(); 372 } 373 | top_level_declaration { 374 global_clean_up_decl(false); 375 clear_warning_flags(); 376 } 377 ; 378 379 /* 380 * On the top level, lint allows several forms of declarations that it doesn't 381 * allow in functions. For example, a single ';' is an empty declaration and 382 * is supported by some compilers, but in a function it would be an empty 383 * statement, not a declaration. This makes a difference in C90 mode, where 384 * a statement must not be followed by a declaration. 385 * 386 * See 'declaration' for all other declarations. 387 */ 388 top_level_declaration: /* C99 6.9 calls this 'declaration' */ 389 T_SEMI { 390 if (sflag) { 391 /* empty declaration */ 392 error(0); 393 } else if (!tflag) { 394 /* empty declaration */ 395 warning(0); 396 } 397 } 398 | clrtyp deftyp notype_init_decls T_SEMI { 399 if (sflag) { 400 /* old style declaration; add 'int' */ 401 error(1); 402 } else if (!tflag) { 403 /* old style declaration; add 'int' */ 404 warning(1); 405 } 406 } 407 | declmods deftyp T_SEMI { 408 if (dcs->d_scl == TYPEDEF) { 409 /* typedef declares no type name */ 410 warning(72); 411 } else { 412 /* empty declaration */ 413 warning(2); 414 } 415 } 416 | declmods deftyp notype_init_decls T_SEMI 417 | declaration_specifiers deftyp T_SEMI { 418 if (dcs->d_scl == TYPEDEF) { 419 /* typedef declares no type name */ 420 warning(72); 421 } else if (!dcs->d_nonempty_decl) { 422 /* empty declaration */ 423 warning(2); 424 } 425 } 426 | declaration_specifiers deftyp type_init_decls T_SEMI 427 | error T_SEMI { 428 global_clean_up(); 429 } 430 | error T_RBRACE { 431 global_clean_up(); 432 } 433 ; 434 435 function_definition: /* C99 6.9.1 */ 436 func_decl { 437 if ($1->s_type->t_tspec != FUNC) { 438 /* syntax error '%s' */ 439 error(249, yytext); 440 YYERROR; 441 } 442 if ($1->s_type->t_typedef) { 443 /* ()-less function definition */ 444 error(64); 445 YYERROR; 446 } 447 funcdef($1); 448 block_level++; 449 begin_declaration_level(ARG); 450 if (lwarn == LWARN_NONE) 451 $1->s_used = true; 452 } arg_declaration_list_opt { 453 end_declaration_level(); 454 block_level--; 455 check_func_lint_directives(); 456 check_func_old_style_arguments(); 457 begin_control_statement(CS_FUNCTION_BODY); 458 } compound_statement { 459 funcend(); 460 end_control_statement(CS_FUNCTION_BODY); 461 } 462 ; 463 464 func_decl: 465 clrtyp deftyp notype_decl { 466 $$ = $3; 467 } 468 | declmods deftyp notype_decl { 469 $$ = $3; 470 } 471 | declaration_specifiers deftyp type_decl { 472 $$ = $3; 473 } 474 ; 475 476 arg_declaration_list_opt: /* C99 6.9.1p13 example 1 */ 477 /* empty */ 478 | arg_declaration_list 479 ; 480 481 arg_declaration_list: /* C99 6.9.1p13 example 1 */ 482 arg_declaration 483 | arg_declaration_list arg_declaration 484 /* XXX or better "arg_declaration error" ? */ 485 | error 486 ; 487 488 /* 489 * "arg_declaration" is separated from "declaration" because it 490 * needs other error handling. 491 */ 492 arg_declaration: 493 declmods deftyp T_SEMI { 494 /* empty declaration */ 495 warning(2); 496 } 497 | declmods deftyp notype_init_decls T_SEMI 498 | declaration_specifiers deftyp T_SEMI { 499 if (!dcs->d_nonempty_decl) { 500 /* empty declaration */ 501 warning(2); 502 } else { 503 /* '%s' declared in argument declaration list */ 504 warning(3, type_name(dcs->d_type)); 505 } 506 } 507 | declaration_specifiers deftyp type_init_decls T_SEMI { 508 if (dcs->d_nonempty_decl) { 509 /* '%s' declared in argument declaration list */ 510 warning(3, type_name(dcs->d_type)); 511 } 512 } 513 | declmods error 514 | declaration_specifiers error 515 ; 516 517 declaration: /* C99 6.7 */ 518 declmods deftyp T_SEMI { 519 if (dcs->d_scl == TYPEDEF) { 520 /* typedef declares no type name */ 521 warning(72); 522 } else { 523 /* empty declaration */ 524 warning(2); 525 } 526 } 527 | declmods deftyp notype_init_decls T_SEMI 528 | declaration_specifiers deftyp T_SEMI { 529 if (dcs->d_scl == TYPEDEF) { 530 /* typedef declares no type name */ 531 warning(72); 532 } else if (!dcs->d_nonempty_decl) { 533 /* empty declaration */ 534 warning(2); 535 } 536 } 537 | declaration_specifiers deftyp type_init_decls T_SEMI 538 | error T_SEMI 539 ; 540 541 type_attribute_format_type: 542 T_AT_FORMAT_GNU_PRINTF 543 | T_AT_FORMAT_PRINTF 544 | T_AT_FORMAT_SCANF 545 | T_AT_FORMAT_STRFMON 546 | T_AT_FORMAT_STRFTIME 547 | T_AT_FORMAT_SYSLOG 548 ; 549 550 type_attribute_bounded_type: 551 T_AT_MINBYTES 552 | T_AT_STRING 553 | T_AT_BUFFER 554 ; 555 556 557 type_attribute_spec: 558 /* empty */ 559 | T_AT_ALWAYS_INLINE 560 | T_AT_ALIAS T_LPAREN string T_RPAREN 561 | T_AT_ALIGNED T_LPAREN constant_expr T_RPAREN 562 | T_AT_ALIGNED 563 | T_AT_ALLOC_SIZE T_LPAREN constant_expr T_COMMA constant_expr T_RPAREN 564 | T_AT_ALLOC_SIZE T_LPAREN constant_expr T_RPAREN 565 | T_AT_BOUNDED T_LPAREN type_attribute_bounded_type 566 T_COMMA constant_expr T_COMMA constant_expr T_RPAREN 567 | T_AT_COLD 568 | T_AT_COMMON 569 | T_AT_CONSTRUCTOR T_LPAREN constant_expr T_RPAREN 570 | T_AT_CONSTRUCTOR 571 | T_AT_DEPRECATED T_LPAREN string T_RPAREN 572 | T_AT_DEPRECATED 573 | T_AT_DESTRUCTOR T_LPAREN constant_expr T_RPAREN 574 | T_AT_DESTRUCTOR 575 | T_AT_FALLTHROUGH { 576 fallthru(1); 577 } 578 | T_AT_FORMAT T_LPAREN type_attribute_format_type T_COMMA 579 constant_expr T_COMMA constant_expr T_RPAREN 580 | T_AT_FORMAT_ARG T_LPAREN constant_expr T_RPAREN 581 | T_AT_GNU_INLINE 582 | T_AT_MALLOC 583 | T_AT_MAY_ALIAS 584 | T_AT_MODE T_LPAREN T_NAME T_RPAREN 585 | T_AT_NOINLINE 586 | T_AT_NONNULL T_LPAREN constant_expr_list_opt T_RPAREN 587 | T_AT_NONNULL 588 | T_AT_NONSTRING 589 | T_AT_NORETURN 590 | T_AT_NOTHROW 591 | T_AT_NO_INSTRUMENT_FUNCTION 592 | T_AT_OPTIMIZE T_LPAREN string T_RPAREN 593 | T_AT_PACKED { 594 addpacked(); 595 } 596 | T_AT_PCS T_LPAREN string T_RPAREN 597 | T_AT_PURE 598 | T_AT_RETURNS_TWICE 599 | T_AT_SECTION T_LPAREN string T_RPAREN 600 | T_AT_SENTINEL T_LPAREN constant_expr T_RPAREN 601 | T_AT_SENTINEL 602 | T_AT_TLS_MODEL T_LPAREN string T_RPAREN 603 | T_AT_TUNION 604 | T_AT_UNUSED { 605 add_attr_used(); 606 } 607 | T_AT_USED { 608 add_attr_used(); 609 } 610 | T_AT_VISIBILITY T_LPAREN constant_expr T_RPAREN 611 | T_AT_WARN_UNUSED_RESULT 612 | T_AT_WEAK 613 | T_QUAL { 614 if ($1 != CONST) 615 yyerror("Bad attribute"); 616 } 617 ; 618 619 type_attribute_spec_list: 620 type_attribute_spec 621 | type_attribute_spec_list T_COMMA type_attribute_spec 622 ; 623 624 align_as: 625 typespec 626 | constant_expr 627 ; 628 629 type_attribute: 630 T_ATTRIBUTE T_LPAREN T_LPAREN { 631 attron = true; 632 } type_attribute_spec_list { 633 attron = false; 634 } T_RPAREN T_RPAREN 635 | T_ALIGNAS T_LPAREN align_as T_RPAREN { 636 } 637 | T_PACKED { 638 addpacked(); 639 } 640 | T_NORETURN { 641 } 642 ; 643 644 type_attribute_list: 645 type_attribute 646 | type_attribute_list type_attribute 647 ; 648 649 clrtyp: 650 /* empty */ { 651 clrtyp(); 652 } 653 ; 654 655 deftyp: 656 /* empty */ { 657 deftyp(); 658 } 659 ; 660 661 declaration_specifiers: /* C99 6.7 */ 662 clrtyp_typespec { 663 add_type($1); 664 } 665 | declmods typespec { 666 add_type($2); 667 } 668 | type_attribute declaration_specifiers 669 | declaration_specifiers declmod 670 | declaration_specifiers notype_typespec { 671 add_type($2); 672 } 673 ; 674 675 declmods: 676 clrtyp T_QUAL { 677 add_qualifier($2); 678 } 679 | clrtyp T_SCLASS { 680 add_storage_class($2); 681 } 682 | declmods declmod 683 ; 684 685 declmod: 686 T_QUAL { 687 add_qualifier($1); 688 } 689 | T_SCLASS { 690 add_storage_class($1); 691 } 692 | type_attribute_list 693 ; 694 695 clrtyp_typespec: 696 clrtyp notype_typespec { 697 $$ = $2; 698 } 699 | T_TYPENAME clrtyp { 700 $$ = getsym($1)->s_type; 701 } 702 ; 703 704 typespec: 705 notype_typespec 706 | T_TYPENAME { 707 $$ = getsym($1)->s_type; 708 } 709 ; 710 711 notype_typespec: 712 T_TYPE { 713 $$ = gettyp($1); 714 } 715 | T_TYPEOF term { 716 $$ = $2->tn_type; 717 } 718 | struct_spec { 719 end_declaration_level(); 720 $$ = $1; 721 } 722 | enum_spec { 723 end_declaration_level(); 724 $$ = $1; 725 } 726 ; 727 728 struct_spec: 729 struct struct_tag { 730 /* 731 * STDC requires that "struct a;" always introduces 732 * a new tag if "a" is not declared at current level 733 * 734 * yychar is valid because otherwise the parser would not 735 * have been able to decide if it must shift or reduce 736 */ 737 $$ = mktag($2, $1, false, yychar == T_SEMI); 738 } 739 | struct struct_tag { 740 dcs->d_tagtyp = mktag($2, $1, true, false); 741 } struct_declaration { 742 $$ = complete_tag_struct_or_union(dcs->d_tagtyp, $4); 743 } 744 | struct { 745 dcs->d_tagtyp = mktag(NULL, $1, true, false); 746 } struct_declaration { 747 $$ = complete_tag_struct_or_union(dcs->d_tagtyp, $3); 748 } 749 | struct error { 750 symtyp = FVFT; 751 $$ = gettyp(INT); 752 } 753 ; 754 755 struct: 756 struct type_attribute 757 | T_STRUCT_OR_UNION { 758 symtyp = FTAG; 759 begin_declaration_level($1 == STRUCT ? MOS : MOU); 760 dcs->d_offset = 0; 761 dcs->d_stralign = CHAR_SIZE; 762 $$ = $1; 763 } 764 ; 765 766 struct_tag: 767 identifier { 768 $$ = getsym($1); 769 } 770 ; 771 772 struct_declaration: 773 struct_decl_lbrace member_declaration_list_with_rbrace { 774 $$ = $2; 775 } 776 ; 777 778 struct_decl_lbrace: 779 T_LBRACE { 780 symtyp = FVFT; 781 } 782 ; 783 784 member_declaration_list_with_rbrace: 785 member_declaration_list T_SEMI T_RBRACE 786 | member_declaration_list T_RBRACE { 787 if (sflag) { 788 /* syntax req. ';' after last struct/union member */ 789 error(66); 790 } else { 791 /* syntax req. ';' after last struct/union member */ 792 warning(66); 793 } 794 $$ = $1; 795 } 796 | T_RBRACE { 797 $$ = NULL; 798 } 799 ; 800 801 type_attribute_opt: 802 /* empty */ 803 | type_attribute 804 ; 805 806 member_declaration_list: 807 member_declaration 808 | member_declaration_list T_SEMI member_declaration { 809 $$ = 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 $$ = dcs->d_type->t_str->sou_first_member; 835 anonymize($$); 836 } 837 | noclass_declspecs deftyp type_attribute_opt { 838 symtyp = FVFT; 839 /* struct or union member must be named */ 840 if (!Sflag) 841 /* anonymous struct/union members is a C9X feature */ 842 warning(49); 843 if (is_struct_or_union(dcs->d_type->t_tspec)) { 844 $$ = dcs->d_type->t_str->sou_first_member; 845 /* add all the members of the anonymous struct/union */ 846 anonymize($$); 847 } else { 848 /* syntax error '%s' */ 849 error(249, "unnamed member"); 850 $$ = NULL; 851 } 852 } 853 | error { 854 symtyp = FVFT; 855 $$ = NULL; 856 } 857 ; 858 859 noclass_declspecs: 860 clrtyp_typespec { 861 add_type($1); 862 } 863 | type_attribute noclass_declspecs 864 | noclass_declmods typespec { 865 add_type($2); 866 } 867 | noclass_declspecs T_QUAL { 868 add_qualifier($2); 869 } 870 | noclass_declspecs notype_typespec { 871 add_type($2); 872 } 873 | noclass_declspecs type_attribute 874 ; 875 876 noclass_declmods: 877 clrtyp T_QUAL { 878 add_qualifier($2); 879 } 880 | noclass_declmods T_QUAL { 881 add_qualifier($2); 882 } 883 ; 884 885 notype_member_decls: 886 notype_member_decl { 887 $$ = declarator_1_struct_union($1); 888 } 889 | notype_member_decls { 890 symtyp = FMEMBER; 891 } T_COMMA type_member_decl { 892 $$ = lnklst($1, declarator_1_struct_union($4)); 893 } 894 ; 895 896 type_member_decls: 897 type_member_decl { 898 $$ = declarator_1_struct_union($1); 899 } 900 | type_member_decls { 901 symtyp = FMEMBER; 902 } T_COMMA type_member_decl { 903 $$ = lnklst($1, declarator_1_struct_union($4)); 904 } 905 ; 906 907 notype_member_decl: 908 notype_decl 909 | notype_decl T_COLON constant_expr { /* C99 6.7.2.1 */ 910 $$ = bitfield($1, to_int_constant($3, true)); 911 } 912 | { 913 symtyp = FVFT; 914 } T_COLON constant_expr { /* C99 6.7.2.1 */ 915 $$ = bitfield(NULL, to_int_constant($3, true)); 916 } 917 ; 918 919 type_member_decl: 920 type_decl 921 | type_decl T_COLON constant_expr { 922 $$ = bitfield($1, to_int_constant($3, true)); 923 } 924 | { 925 symtyp = FVFT; 926 } T_COLON constant_expr { 927 $$ = bitfield(NULL, to_int_constant($3, true)); 928 } 929 ; 930 931 enum_spec: 932 enum enum_tag { 933 $$ = mktag($2, ENUM, false, false); 934 } 935 | enum enum_tag { 936 dcs->d_tagtyp = mktag($2, ENUM, true, false); 937 } enum_declaration { 938 $$ = complete_tag_enum(dcs->d_tagtyp, $4); 939 } 940 | enum { 941 dcs->d_tagtyp = mktag(NULL, ENUM, true, false); 942 } enum_declaration { 943 $$ = complete_tag_enum(dcs->d_tagtyp, $3); 944 } 945 | enum error { 946 symtyp = FVFT; 947 $$ = gettyp(INT); 948 } 949 ; 950 951 enum: 952 T_ENUM { 953 symtyp = FTAG; 954 begin_declaration_level(CTCONST); 955 } 956 ; 957 958 enum_tag: 959 identifier { 960 $$ = getsym($1); 961 } 962 ; 963 964 enum_declaration: 965 enum_decl_lbrace enums_with_opt_comma T_RBRACE { 966 $$ = $2; 967 } 968 ; 969 970 enum_decl_lbrace: 971 T_LBRACE { 972 symtyp = FVFT; 973 enumval = 0; 974 } 975 ; 976 977 enums_with_opt_comma: 978 enums 979 | enums T_COMMA { 980 if (sflag) { 981 /* trailing ',' prohibited in enum declaration */ 982 error(54); 983 } else { 984 /* trailing ',' prohibited in enum declaration */ 985 c99ism(54); 986 } 987 $$ = $1; 988 } 989 ; 990 991 enums: 992 enumerator 993 | enums T_COMMA enumerator { 994 $$ = lnklst($1, $3); 995 } 996 | error { 997 $$ = NULL; 998 } 999 ; 1000 1001 enumerator: 1002 enumeration_constant { 1003 $$ = enumeration_constant($1, enumval, true); 1004 } 1005 | enumeration_constant T_ASSIGN constant_expr { 1006 $$ = enumeration_constant($1, to_int_constant($3, true), false); 1007 } 1008 ; 1009 1010 enumeration_constant: /* C99 6.4.4.3 */ 1011 identifier { 1012 $$ = getsym($1); 1013 } 1014 ; 1015 1016 1017 notype_init_decls: 1018 notype_init_decl 1019 | notype_init_decls T_COMMA type_init_decl 1020 ; 1021 1022 type_init_decls: 1023 type_init_decl 1024 | type_init_decls T_COMMA type_init_decl 1025 ; 1026 1027 notype_init_decl: 1028 notype_decl asm_or_symbolrename_opt { 1029 cgram_declare($1, false, $2); 1030 check_size($1); 1031 } 1032 | notype_decl asm_or_symbolrename_opt { 1033 begin_initialization($1); 1034 cgram_declare($1, true, $2); 1035 } T_ASSIGN initializer { 1036 check_size($1); 1037 end_initialization(); 1038 } 1039 ; 1040 1041 type_init_decl: 1042 type_decl asm_or_symbolrename_opt { 1043 cgram_declare($1, false, $2); 1044 check_size($1); 1045 } 1046 | type_decl asm_or_symbolrename_opt { 1047 begin_initialization($1); 1048 cgram_declare($1, true, $2); 1049 } T_ASSIGN initializer { 1050 check_size($1); 1051 end_initialization(); 1052 } 1053 ; 1054 1055 notype_decl: 1056 notype_direct_decl 1057 | pointer notype_direct_decl { 1058 $$ = add_pointer($2, $1); 1059 } 1060 ; 1061 1062 type_decl: 1063 type_direct_decl 1064 | pointer type_direct_decl { 1065 $$ = add_pointer($2, $1); 1066 } 1067 ; 1068 1069 notype_direct_decl: 1070 T_NAME { 1071 $$ = declarator_name(getsym($1)); 1072 } 1073 | T_LPAREN type_decl T_RPAREN { 1074 $$ = $2; 1075 } 1076 | type_attribute notype_direct_decl { 1077 $$ = $2; 1078 } 1079 | notype_direct_decl T_LBRACK T_RBRACK { 1080 $$ = add_array($1, false, 0); 1081 } 1082 | notype_direct_decl T_LBRACK array_size T_RBRACK { 1083 $$ = add_array($1, true, to_int_constant($3, false)); 1084 } 1085 | notype_direct_decl param_list asm_or_symbolrename_opt { 1086 $$ = add_function(symbolrename($1, $3), $2); 1087 end_declaration_level(); 1088 block_level--; 1089 } 1090 | notype_direct_decl type_attribute_list 1091 ; 1092 1093 /* 1094 * TODO: document whether the subtle difference between 'identifier' here and 1095 * 'T_NAME' in notype_direct_decl above is on purpose. 1096 */ 1097 type_direct_decl: 1098 identifier { 1099 $$ = declarator_name(getsym($1)); 1100 } 1101 | T_LPAREN type_decl T_RPAREN { 1102 $$ = $2; 1103 } 1104 | type_attribute type_direct_decl { 1105 $$ = $2; 1106 } 1107 | type_direct_decl T_LBRACK T_RBRACK { 1108 $$ = add_array($1, false, 0); 1109 } 1110 | type_direct_decl T_LBRACK array_size T_RBRACK { 1111 $$ = add_array($1, true, to_int_constant($3, false)); 1112 } 1113 | type_direct_decl param_list asm_or_symbolrename_opt { 1114 $$ = add_function(symbolrename($1, $3), $2); 1115 end_declaration_level(); 1116 block_level--; 1117 } 1118 | type_direct_decl type_attribute_list 1119 ; 1120 1121 /* 1122 * param_decl and notype_param_decl exist to avoid a conflict in 1123 * argument lists. A typename enclosed in parens should always be 1124 * treated as a typename, not an argument. 1125 * "typedef int a; f(int (a));" is "typedef int a; f(int foo(a));" 1126 * not "typedef int a; f(int a);" 1127 */ 1128 param_decl: 1129 direct_param_decl 1130 | pointer direct_param_decl { 1131 $$ = add_pointer($2, $1); 1132 } 1133 ; 1134 1135 type_qualifier_list_opt: 1136 /* empty */ 1137 | type_qualifier_list 1138 ; 1139 1140 array_size: 1141 type_qualifier_list_opt T_SCLASS constant_expr { 1142 /* C11 6.7.6.3p7 */ 1143 if ($2 != STATIC) 1144 yyerror("Bad attribute"); 1145 /* static array size is a C11 extension */ 1146 c11ism(343); 1147 $$ = $3; 1148 } 1149 | constant_expr 1150 ; 1151 1152 direct_param_decl: 1153 identifier type_attribute_list { 1154 $$ = declarator_name(getsym($1)); 1155 } 1156 | identifier { 1157 $$ = declarator_name(getsym($1)); 1158 } 1159 | T_LPAREN notype_param_decl T_RPAREN { 1160 $$ = $2; 1161 } 1162 | direct_param_decl T_LBRACK T_RBRACK { 1163 $$ = add_array($1, false, 0); 1164 } 1165 | direct_param_decl T_LBRACK array_size T_RBRACK { 1166 $$ = add_array($1, true, to_int_constant($3, false)); 1167 } 1168 | direct_param_decl param_list asm_or_symbolrename_opt { 1169 $$ = add_function(symbolrename($1, $3), $2); 1170 end_declaration_level(); 1171 block_level--; 1172 } 1173 ; 1174 1175 notype_param_decl: 1176 direct_notype_param_decl 1177 | pointer direct_notype_param_decl { 1178 $$ = add_pointer($2, $1); 1179 } 1180 ; 1181 1182 direct_notype_param_decl: 1183 identifier { 1184 $$ = declarator_name(getsym($1)); 1185 } 1186 | T_LPAREN notype_param_decl T_RPAREN { 1187 $$ = $2; 1188 } 1189 | direct_notype_param_decl T_LBRACK T_RBRACK { 1190 $$ = add_array($1, false, 0); 1191 } 1192 | direct_notype_param_decl T_LBRACK array_size T_RBRACK { 1193 $$ = add_array($1, true, to_int_constant($3, false)); 1194 } 1195 | direct_notype_param_decl param_list asm_or_symbolrename_opt { 1196 $$ = add_function(symbolrename($1, $3), $2); 1197 end_declaration_level(); 1198 block_level--; 1199 } 1200 ; 1201 1202 pointer: /* C99 6.7.5 */ 1203 asterisk 1204 | asterisk type_qualifier_list { 1205 $$ = merge_qualified_pointer($1, $2); 1206 } 1207 | asterisk pointer { 1208 $$ = merge_qualified_pointer($1, $2); 1209 } 1210 | asterisk type_qualifier_list pointer { 1211 $$ = merge_qualified_pointer($1, $2); 1212 $$ = merge_qualified_pointer($$, $3); 1213 } 1214 ; 1215 1216 asterisk: 1217 T_ASTERISK { 1218 $$ = xcalloc(1, sizeof(*$$)); 1219 $$->p_pointer = true; 1220 } 1221 ; 1222 1223 /* TODO: try whether type_qualifier_list_opt makes the code simpler */ 1224 type_qualifier_list: 1225 type_qualifier 1226 | type_qualifier_list type_qualifier { 1227 $$ = merge_qualified_pointer($1, $2); 1228 } 1229 ; 1230 1231 type_qualifier: 1232 T_QUAL { 1233 $$ = xcalloc(1, sizeof(*$$)); 1234 if ($1 == CONST) { 1235 $$->p_const = true; 1236 } else if ($1 == VOLATILE) { 1237 $$->p_volatile = true; 1238 } else { 1239 lint_assert($1 == RESTRICT || $1 == THREAD); 1240 } 1241 } 1242 ; 1243 1244 param_list: 1245 id_list_lparen identifier_list T_RPAREN { 1246 $$ = $2; 1247 } 1248 | abstract_decl_param_list 1249 ; 1250 1251 id_list_lparen: 1252 T_LPAREN { 1253 block_level++; 1254 begin_declaration_level(PROTO_ARG); 1255 } 1256 ; 1257 1258 identifier_list: 1259 T_NAME { 1260 $$ = old_style_function_name(getsym($1)); 1261 } 1262 | identifier_list T_COMMA T_NAME { 1263 $$ = lnklst($1, old_style_function_name(getsym($3))); 1264 } 1265 | identifier_list error 1266 ; 1267 1268 abstract_decl_param_list: 1269 abstract_decl_lparen T_RPAREN type_attribute_opt { 1270 $$ = NULL; 1271 } 1272 | abstract_decl_lparen vararg_parameter_type_list T_RPAREN type_attribute_opt { 1273 dcs->d_proto = true; 1274 $$ = $2; 1275 } 1276 | abstract_decl_lparen error T_RPAREN type_attribute_opt { 1277 $$ = NULL; 1278 } 1279 ; 1280 1281 abstract_decl_lparen: 1282 T_LPAREN { 1283 block_level++; 1284 begin_declaration_level(PROTO_ARG); 1285 } 1286 ; 1287 1288 vararg_parameter_type_list: 1289 parameter_type_list 1290 | parameter_type_list T_COMMA T_ELLIPSIS { 1291 dcs->d_vararg = true; 1292 $$ = $1; 1293 } 1294 | T_ELLIPSIS { 1295 if (sflag) { 1296 /* ANSI C requires formal parameter before '...' */ 1297 error(84); 1298 } else if (!tflag) { 1299 /* ANSI C requires formal parameter before '...' */ 1300 warning(84); 1301 } 1302 dcs->d_vararg = true; 1303 $$ = NULL; 1304 } 1305 ; 1306 1307 parameter_type_list: 1308 parameter_declaration 1309 | parameter_type_list T_COMMA parameter_declaration { 1310 $$ = lnklst($1, $3); 1311 } 1312 ; 1313 1314 parameter_declaration: 1315 declmods deftyp { 1316 $$ = declare_argument(abstract_name(), false); 1317 } 1318 | declaration_specifiers deftyp { 1319 $$ = declare_argument(abstract_name(), false); 1320 } 1321 | declmods deftyp notype_param_decl { 1322 $$ = declare_argument($3, false); 1323 } 1324 /* 1325 * param_decl is needed because of following conflict: 1326 * "typedef int a; f(int (a));" could be parsed as 1327 * "function with argument a of type int", or 1328 * "function with an abstract argument of type function". 1329 * This grammar realizes the second case. 1330 */ 1331 | declaration_specifiers deftyp param_decl { 1332 $$ = declare_argument($3, false); 1333 } 1334 | declmods deftyp abstract_decl { 1335 $$ = declare_argument($3, false); 1336 } 1337 | declaration_specifiers deftyp abstract_decl { 1338 $$ = declare_argument($3, false); 1339 } 1340 ; 1341 1342 asm_or_symbolrename_opt: /* expect only one */ 1343 /* empty */ { 1344 $$ = NULL; 1345 } 1346 | T_ASM T_LPAREN T_STRING T_RPAREN { 1347 freeyyv(&$3, T_STRING); 1348 $$ = NULL; 1349 } 1350 | T_SYMBOLRENAME T_LPAREN T_NAME T_RPAREN { 1351 $$ = $3; 1352 } 1353 ; 1354 1355 initializer: /* C99 6.7.8 "Initialization" */ 1356 expr %prec T_COMMA { 1357 init_expr($1); 1358 } 1359 | init_lbrace init_rbrace { 1360 /* XXX: Empty braces are not covered by C99 6.7.8. */ 1361 } 1362 | init_lbrace initializer_list comma_opt init_rbrace 1363 | error 1364 ; 1365 1366 initializer_list: /* C99 6.7.8 "Initialization" */ 1367 initializer_list_item 1368 | initializer_list T_COMMA initializer_list_item 1369 ; 1370 1371 initializer_list_item: 1372 designation initializer 1373 | initializer 1374 ; 1375 1376 designation: /* C99 6.7.8 "Initialization" */ 1377 designator_list T_ASSIGN 1378 | identifier T_COLON { 1379 /* GCC style struct or union member name in initializer */ 1380 gnuism(315); 1381 add_designator_member($1); 1382 } 1383 ; 1384 1385 designator_list: /* C99 6.7.8 "Initialization" */ 1386 designator 1387 | designator_list designator 1388 ; 1389 1390 designator: /* C99 6.7.8 "Initialization" */ 1391 T_LBRACK range T_RBRACK { 1392 add_designator_subscript($2); 1393 if (!Sflag) 1394 /* array initializer with des.s is a C9X feature */ 1395 warning(321); 1396 } 1397 | T_POINT identifier { 1398 if (!Sflag) 1399 /* struct or union member name in initializer is ... */ 1400 warning(313); 1401 add_designator_member($2); 1402 } 1403 ; 1404 1405 range: 1406 constant_expr { 1407 $$.lo = to_int_constant($1, true); 1408 $$.hi = $$.lo; 1409 } 1410 | constant_expr T_ELLIPSIS constant_expr { 1411 $$.lo = to_int_constant($1, true); 1412 $$.hi = to_int_constant($3, true); 1413 /* initialization with '[a...b]' is a GNU extension */ 1414 gnuism(340); 1415 } 1416 ; 1417 1418 init_lbrace: 1419 T_LBRACE { 1420 init_lbrace(); 1421 } 1422 ; 1423 1424 init_rbrace: 1425 T_RBRACE { 1426 init_rbrace(); 1427 } 1428 ; 1429 1430 type_name: 1431 { 1432 begin_declaration_level(ABSTRACT); 1433 } abstract_declaration { 1434 end_declaration_level(); 1435 $$ = $2->s_type; 1436 } 1437 ; 1438 1439 abstract_declaration: 1440 noclass_declmods deftyp { 1441 $$ = declare_1_abstract(abstract_name()); 1442 } 1443 | noclass_declspecs deftyp { 1444 $$ = declare_1_abstract(abstract_name()); 1445 } 1446 | noclass_declmods deftyp abstract_decl { 1447 $$ = declare_1_abstract($3); 1448 } 1449 | noclass_declspecs deftyp abstract_decl { 1450 $$ = declare_1_abstract($3); 1451 } 1452 ; 1453 1454 /* TODO: abstract_declaration and abstract_decl sound too similar */ 1455 abstract_decl: 1456 pointer { 1457 $$ = add_pointer(abstract_name(), $1); 1458 } 1459 | direct_abstract_decl 1460 | pointer direct_abstract_decl { 1461 $$ = add_pointer($2, $1); 1462 } 1463 | T_TYPEOF term { 1464 $$ = mktempsym($2->tn_type); 1465 } 1466 ; 1467 1468 direct_abstract_decl: 1469 T_LPAREN abstract_decl T_RPAREN { 1470 $$ = $2; 1471 } 1472 | T_LBRACK T_RBRACK { 1473 $$ = add_array(abstract_name(), false, 0); 1474 } 1475 | T_LBRACK array_size T_RBRACK { 1476 $$ = add_array(abstract_name(), true, to_int_constant($2, false)); 1477 } 1478 | type_attribute direct_abstract_decl { 1479 $$ = $2; 1480 } 1481 | direct_abstract_decl T_LBRACK T_RBRACK { 1482 $$ = add_array($1, false, 0); 1483 } 1484 | direct_abstract_decl T_LBRACK array_size T_RBRACK { 1485 $$ = add_array($1, true, to_int_constant($3, false)); 1486 } 1487 | abstract_decl_param_list asm_or_symbolrename_opt { 1488 $$ = add_function(symbolrename(abstract_name(), $2), $1); 1489 end_declaration_level(); 1490 block_level--; 1491 } 1492 | direct_abstract_decl abstract_decl_param_list asm_or_symbolrename_opt { 1493 $$ = add_function(symbolrename($1, $3), $2); 1494 end_declaration_level(); 1495 block_level--; 1496 } 1497 | direct_abstract_decl type_attribute_list 1498 ; 1499 1500 non_expr_statement: 1501 type_attribute T_SEMI 1502 | labeled_statement 1503 | compound_statement 1504 | selection_statement 1505 | iteration_statement 1506 | jump_statement { 1507 seen_fallthrough = false; 1508 } 1509 | asm_statement 1510 ; 1511 1512 statement: /* C99 6.8 */ 1513 expr_statement 1514 | non_expr_statement 1515 ; 1516 1517 labeled_statement: /* C99 6.8.1 */ 1518 label type_attribute_opt statement 1519 ; 1520 1521 label: 1522 T_NAME T_COLON { 1523 symtyp = FLABEL; 1524 named_label(getsym($1)); 1525 } 1526 | T_CASE constant_expr T_COLON { 1527 case_label($2); 1528 seen_fallthrough = true; 1529 } 1530 | T_CASE constant_expr T_ELLIPSIS constant_expr T_COLON { 1531 /* XXX: We don't fill all cases */ 1532 case_label($2); 1533 seen_fallthrough = true; 1534 } 1535 | T_DEFAULT T_COLON { 1536 default_label(); 1537 seen_fallthrough = true; 1538 } 1539 ; 1540 1541 compound_statement: /* C99 6.8.2 */ 1542 compound_statement_lbrace compound_statement_rbrace 1543 | compound_statement_lbrace block_item_list compound_statement_rbrace 1544 ; 1545 1546 compound_statement_lbrace: 1547 T_LBRACE { 1548 block_level++; 1549 mem_block_level++; 1550 begin_declaration_level(AUTO); 1551 } 1552 ; 1553 1554 compound_statement_rbrace: 1555 T_RBRACE { 1556 end_declaration_level(); 1557 freeblk(); 1558 mem_block_level--; 1559 block_level--; 1560 seen_fallthrough = false; 1561 } 1562 ; 1563 1564 block_item_list: 1565 block_item 1566 | block_item_list block_item { 1567 if (!Sflag && $1 && !$2) 1568 /* declarations after statements is a C99 feature */ 1569 c99ism(327); 1570 $$ = $1 || $2; 1571 } 1572 ; 1573 1574 block_item: 1575 statement { 1576 $$ = true; 1577 restore_warning_flags(); 1578 } 1579 | declaration { 1580 $$ = false; 1581 restore_warning_flags(); 1582 } 1583 ; 1584 1585 expr_statement: 1586 expr T_SEMI { 1587 expr($1, false, false, false, false); 1588 seen_fallthrough = false; 1589 } 1590 | T_SEMI { 1591 seen_fallthrough = false; 1592 } 1593 ; 1594 1595 selection_statement: /* C99 6.8.4 */ 1596 if_without_else { 1597 save_warning_flags(); 1598 if2(); 1599 if3(false); 1600 } 1601 | if_without_else T_ELSE { 1602 save_warning_flags(); 1603 if2(); 1604 } statement { 1605 clear_warning_flags(); 1606 if3(true); 1607 } 1608 | if_without_else T_ELSE error { 1609 clear_warning_flags(); 1610 if3(false); 1611 } 1612 | switch_expr statement { 1613 clear_warning_flags(); 1614 switch2(); 1615 } 1616 | switch_expr error { 1617 clear_warning_flags(); 1618 switch2(); 1619 } 1620 ; 1621 1622 if_without_else: 1623 if_expr statement 1624 | if_expr error 1625 ; 1626 1627 if_expr: 1628 T_IF T_LPAREN expr T_RPAREN { 1629 if1($3); 1630 clear_warning_flags(); 1631 } 1632 ; 1633 1634 switch_expr: 1635 T_SWITCH T_LPAREN expr T_RPAREN { 1636 switch1($3); 1637 clear_warning_flags(); 1638 } 1639 ; 1640 1641 generic_selection: /* C11 6.5.1.1 */ 1642 T_GENERIC T_LPAREN assignment_expression T_COMMA 1643 generic_assoc_list T_RPAREN { 1644 /* generic selection requires C11 or later */ 1645 c11ism(345); 1646 $$ = build_generic_selection($3, $5); 1647 } 1648 ; 1649 1650 generic_assoc_list: /* C11 6.5.1.1 */ 1651 generic_association 1652 | generic_assoc_list T_COMMA generic_association { 1653 $3->gat_prev = $1; 1654 $$ = $3; 1655 } 1656 ; 1657 1658 generic_association: /* C11 6.5.1.1 */ 1659 type_name T_COLON assignment_expression { 1660 $$ = getblk(sizeof(*$$)); 1661 $$->gat_arg = $1; 1662 $$->gat_result = $3; 1663 } 1664 | T_DEFAULT T_COLON assignment_expression { 1665 $$ = getblk(sizeof(*$$)); 1666 $$->gat_arg = NULL; 1667 $$->gat_result = $3; 1668 } 1669 ; 1670 1671 do_statement: /* C99 6.8.5 */ 1672 do statement { 1673 clear_warning_flags(); 1674 } 1675 ; 1676 1677 iteration_statement: /* C99 6.8.5 */ 1678 while_expr statement { 1679 clear_warning_flags(); 1680 while2(); 1681 } 1682 | while_expr error { 1683 clear_warning_flags(); 1684 while2(); 1685 } 1686 | do_statement do_while_expr { 1687 do2($2); 1688 seen_fallthrough = false; 1689 } 1690 | do error { 1691 clear_warning_flags(); 1692 do2(NULL); 1693 } 1694 | for_exprs statement { 1695 clear_warning_flags(); 1696 for2(); 1697 end_declaration_level(); 1698 block_level--; 1699 } 1700 | for_exprs error { 1701 clear_warning_flags(); 1702 for2(); 1703 end_declaration_level(); 1704 block_level--; 1705 } 1706 ; 1707 1708 while_expr: 1709 T_WHILE T_LPAREN expr T_RPAREN { 1710 while1($3); 1711 clear_warning_flags(); 1712 } 1713 ; 1714 1715 do: 1716 T_DO { 1717 do1(); 1718 } 1719 ; 1720 1721 do_while_expr: 1722 T_WHILE T_LPAREN expr T_RPAREN T_SEMI { 1723 $$ = $3; 1724 } 1725 ; 1726 1727 for_start: 1728 T_FOR T_LPAREN { 1729 begin_declaration_level(AUTO); 1730 block_level++; 1731 } 1732 ; 1733 for_exprs: 1734 for_start declaration_specifiers deftyp notype_init_decls T_SEMI 1735 expr_opt T_SEMI expr_opt T_RPAREN { 1736 /* variable declaration in for loop */ 1737 c99ism(325); 1738 for1(NULL, $6, $8); 1739 clear_warning_flags(); 1740 } 1741 | for_start expr_opt T_SEMI expr_opt T_SEMI expr_opt T_RPAREN { 1742 for1($2, $4, $6); 1743 clear_warning_flags(); 1744 } 1745 ; 1746 1747 expr_opt: 1748 /* empty */ { 1749 $$ = NULL; 1750 } 1751 | expr 1752 ; 1753 1754 jump_statement: /* C99 6.8.6 */ 1755 goto identifier T_SEMI { 1756 do_goto(getsym($2)); 1757 } 1758 | goto error T_SEMI { 1759 symtyp = FVFT; 1760 } 1761 | T_CONTINUE T_SEMI { 1762 do_continue(); 1763 } 1764 | T_BREAK T_SEMI { 1765 do_break(); 1766 } 1767 | T_RETURN T_SEMI { 1768 do_return(NULL); 1769 } 1770 | T_RETURN expr T_SEMI { 1771 do_return($2); 1772 } 1773 ; 1774 1775 goto: 1776 T_GOTO { 1777 symtyp = FLABEL; 1778 } 1779 ; 1780 1781 asm_statement: 1782 T_ASM T_LPAREN read_until_rparen T_SEMI { 1783 setasm(); 1784 } 1785 | T_ASM T_QUAL T_LPAREN read_until_rparen T_SEMI { 1786 setasm(); 1787 } 1788 | T_ASM error 1789 ; 1790 1791 read_until_rparen: 1792 /* empty */ { 1793 ignore_up_to_rparen(); 1794 } 1795 ; 1796 1797 constant_expr_list_opt: 1798 /* empty */ 1799 | constant_expr_list 1800 ; 1801 1802 constant_expr_list: 1803 constant_expr 1804 | constant_expr_list T_COMMA constant_expr 1805 ; 1806 1807 constant_expr: /* C99 6.6 */ 1808 expr %prec T_ASSIGN 1809 ; 1810 1811 expr: 1812 expr T_ASTERISK expr { 1813 $$ = build(MULT, $1, $3); 1814 } 1815 | expr T_MULTIPLICATIVE expr { 1816 $$ = build($2, $1, $3); 1817 } 1818 | expr T_ADDITIVE expr { 1819 $$ = build($2, $1, $3); 1820 } 1821 | expr T_SHIFT expr { 1822 $$ = build($2, $1, $3); 1823 } 1824 | expr T_RELATIONAL expr { 1825 $$ = build($2, $1, $3); 1826 } 1827 | expr T_EQUALITY expr { 1828 $$ = build($2, $1, $3); 1829 } 1830 | expr T_AMPER expr { 1831 $$ = build(BITAND, $1, $3); 1832 } 1833 | expr T_BITXOR expr { 1834 $$ = build(BITXOR, $1, $3); 1835 } 1836 | expr T_BITOR expr { 1837 $$ = build(BITOR, $1, $3); 1838 } 1839 | expr T_LOGAND expr { 1840 $$ = build(LOGAND, $1, $3); 1841 } 1842 | expr T_LOGOR expr { 1843 $$ = build(LOGOR, $1, $3); 1844 } 1845 | expr T_QUEST expr T_COLON expr { 1846 $$ = build(QUEST, $1, build(COLON, $3, $5)); 1847 } 1848 | expr T_ASSIGN expr { 1849 $$ = build(ASSIGN, $1, $3); 1850 } 1851 | expr T_OPASSIGN expr { 1852 $$ = build($2, $1, $3); 1853 } 1854 | expr T_COMMA expr { 1855 $$ = build(COMMA, $1, $3); 1856 } 1857 | term 1858 | generic_selection 1859 ; 1860 1861 assignment_expression: /* C99 6.5.16 */ 1862 expr %prec T_ASSIGN 1863 ; 1864 1865 term: 1866 T_NAME { 1867 /* XXX really necessary? */ 1868 if (yychar < 0) 1869 yychar = yylex(); 1870 $$ = new_name_node(getsym($1), yychar); 1871 } 1872 | string { 1873 $$ = new_string_node($1); 1874 } 1875 | T_CON { 1876 $$ = expr_new_constant(gettyp($1->v_tspec), $1); 1877 } 1878 | T_LPAREN expr T_RPAREN { 1879 if ($2 != NULL) 1880 $2->tn_parenthesized = true; 1881 $$ = $2; 1882 } 1883 | T_LPAREN compound_statement_lbrace gcc_statement_expr_list { 1884 block_level--; 1885 mem_block_level--; 1886 begin_initialization(mktempsym(dup_type($3->tn_type))); 1887 mem_block_level++; 1888 block_level++; 1889 /* ({ }) is a GCC extension */ 1890 gnuism(320); 1891 } compound_statement_rbrace T_RPAREN { 1892 $$ = new_name_node(*current_initsym(), 0); 1893 end_initialization(); 1894 } 1895 | term T_INCDEC { 1896 $$ = build($2 == INC ? INCAFT : DECAFT, $1, NULL); 1897 } 1898 | T_INCDEC term { 1899 $$ = build($1 == INC ? INCBEF : DECBEF, $2, NULL); 1900 } 1901 | T_ASTERISK term { 1902 $$ = build(INDIR, $2, NULL); 1903 } 1904 | T_AMPER term { 1905 $$ = build(ADDR, $2, NULL); 1906 } 1907 | T_UNARY term { 1908 $$ = build($1, $2, NULL); 1909 } 1910 | T_ADDITIVE term { 1911 if (tflag && $1 == PLUS) { 1912 /* unary + is illegal in traditional C */ 1913 warning(100); 1914 } 1915 $$ = build($1 == PLUS ? UPLUS : UMINUS, $2, NULL); 1916 } 1917 | term T_LBRACK expr T_RBRACK { 1918 $$ = build(INDIR, build(PLUS, $1, $3), NULL); 1919 } 1920 | term T_LPAREN T_RPAREN { 1921 $$ = new_function_call_node($1, NULL); 1922 } 1923 | term T_LPAREN func_arg_list T_RPAREN { 1924 $$ = new_function_call_node($1, $3); 1925 } 1926 | term point_or_arrow T_NAME { 1927 if ($1 != NULL) { 1928 sym_t *msym; 1929 /* 1930 * XXX struct_or_union_member should be integrated 1931 * in build() 1932 */ 1933 if ($2 == ARROW) { 1934 /* 1935 * must do this before struct_or_union_member 1936 * is called 1937 */ 1938 $1 = cconv($1); 1939 } 1940 msym = struct_or_union_member($1, $2, getsym($3)); 1941 $$ = build($2, $1, new_name_node(msym, 0)); 1942 } else { 1943 $$ = NULL; 1944 } 1945 } 1946 | T_REAL term { 1947 $$ = build(REAL, $2, NULL); 1948 } 1949 | T_IMAG term { 1950 $$ = build(IMAG, $2, NULL); 1951 } 1952 | T_EXTENSION term { 1953 $$ = $2; 1954 } 1955 | T_REAL T_LPAREN term T_RPAREN { 1956 $$ = build(REAL, $3, NULL); 1957 } 1958 | T_IMAG T_LPAREN term T_RPAREN { 1959 $$ = build(IMAG, $3, NULL); 1960 } 1961 | T_BUILTIN_OFFSETOF T_LPAREN type_name T_COMMA identifier T_RPAREN { 1962 symtyp = FMEMBER; 1963 $$ = build_offsetof($3, getsym($5)); 1964 } 1965 | T_SIZEOF term { 1966 $$ = $2 == NULL ? NULL : build_sizeof($2->tn_type); 1967 if ($$ != NULL) 1968 check_expr_misc($2, false, false, false, false, false, true); 1969 } 1970 | T_SIZEOF T_LPAREN type_name T_RPAREN %prec T_SIZEOF { 1971 $$ = build_sizeof($3); 1972 } 1973 | T_ALIGNOF T_LPAREN type_name T_RPAREN { 1974 $$ = build_alignof($3); 1975 } 1976 | T_LPAREN type_name T_RPAREN term %prec T_UNARY { 1977 $$ = cast($4, $2); 1978 } 1979 | T_LPAREN type_name T_RPAREN { /* C99 6.5.2.5 "Compound literals" */ 1980 sym_t *tmp = mktempsym($2); 1981 begin_initialization(tmp); 1982 cgram_declare(tmp, true, NULL); 1983 } init_lbrace initializer_list comma_opt init_rbrace { 1984 if (!Sflag) 1985 /* compound literals are a C9X/GCC extension */ 1986 gnuism(319); 1987 $$ = new_name_node(*current_initsym(), 0); 1988 end_initialization(); 1989 } 1990 ; 1991 1992 /* 1993 * The inner part of a GCC statement-expression of the form ({ ... }). 1994 * 1995 * https://gcc.gnu.org/onlinedocs/gcc/Statement-Exprs.html 1996 */ 1997 gcc_statement_expr_list: 1998 gcc_statement_expr_item 1999 | gcc_statement_expr_list gcc_statement_expr_item { 2000 $$ = $2; 2001 } 2002 ; 2003 2004 gcc_statement_expr_item: 2005 declaration { 2006 clear_warning_flags(); 2007 $$ = NULL; 2008 } 2009 | non_expr_statement { 2010 $$ = expr_zalloc_tnode(); 2011 $$->tn_type = gettyp(VOID); 2012 } 2013 | expr T_SEMI { 2014 if ($1 == NULL) { /* in case of syntax errors */ 2015 $$ = expr_zalloc_tnode(); 2016 $$->tn_type = gettyp(VOID); 2017 } else { 2018 /* XXX: do that only on the last name */ 2019 if ($1->tn_op == NAME) 2020 $1->tn_sym->s_used = true; 2021 $$ = $1; 2022 expr($1, false, false, false, false); 2023 seen_fallthrough = false; 2024 } 2025 } 2026 ; 2027 2028 string: 2029 T_STRING 2030 | T_STRING string2 { 2031 $$ = cat_strings($1, $2); 2032 } 2033 ; 2034 2035 string2: 2036 T_STRING { 2037 if (tflag) { 2038 /* concatenated strings are illegal in traditional C */ 2039 warning(219); 2040 } 2041 $$ = $1; 2042 } 2043 | string2 T_STRING { 2044 $$ = cat_strings($1, $2); 2045 } 2046 ; 2047 2048 func_arg_list: 2049 expr %prec T_COMMA { 2050 $$ = new_function_argument_node(NULL, $1); 2051 } 2052 | func_arg_list T_COMMA expr { 2053 $$ = new_function_argument_node($1, $3); 2054 } 2055 ; 2056 2057 point_or_arrow: 2058 T_POINT { 2059 symtyp = FMEMBER; 2060 $$ = POINT; 2061 } 2062 | T_ARROW { 2063 symtyp = FMEMBER; 2064 $$ = ARROW; 2065 } 2066 ; 2067 2068 identifier: /* C99 6.4.2.1 */ 2069 T_NAME { 2070 $$ = $1; 2071 cgram_debug("name '%s'", $$->sb_name); 2072 } 2073 | T_TYPENAME { 2074 $$ = $1; 2075 cgram_debug("typename '%s'", $$->sb_name); 2076 } 2077 ; 2078 2079 comma_opt: 2080 T_COMMA 2081 | /* empty */ 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 01:09:59 GMT 2025