cgram.y revision 1.225
1 %{ 2 /* $NetBSD: cgram.y,v 1.225 2021/05/02 20:53:13 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 1.225 2021/05/02 20:53:13 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 189 127 128 %union { 129 val_t *y_val; 130 sbuf_t *y_sb; 131 sym_t *y_sym; 132 op_t y_op; 133 scl_t y_scl; 134 tspec_t y_tspec; 135 tqual_t y_tqual; 136 type_t *y_type; 137 tnode_t *y_tnode; 138 range_t y_range; 139 strg_t *y_string; 140 pqinf_t *y_pqinf; 141 bool y_seen_statement; 142 }; 143 144 %token T_LBRACE T_RBRACE T_LBRACK T_RBRACK T_LPAREN T_RPAREN 145 %token <y_op> T_MEMBACC 146 %token <y_op> T_UNARY 147 %token <y_op> T_INCDEC 148 %token T_SIZEOF 149 %token T_BUILTIN_OFFSETOF 150 %token T_TYPEOF 151 %token T_EXTENSION 152 %token T_ALIGNAS 153 %token T_ALIGNOF 154 %token T_ASTERISK 155 %token <y_op> T_MULTIPLICATIVE 156 %token <y_op> T_ADDITIVE 157 %token <y_op> T_SHIFT 158 %token <y_op> T_RELATIONAL 159 %token <y_op> T_EQUALITY 160 %token T_AMPER 161 %token T_BITXOR 162 %token T_BITOR 163 %token T_LOGAND 164 %token T_LOGOR 165 %token T_QUEST 166 %token T_COLON 167 %token T_ASSIGN 168 %token <y_op> T_OPASSIGN 169 %token T_COMMA 170 %token T_SEMI 171 %token T_ELLIPSIS 172 %token T_REAL 173 %token T_IMAG 174 %token T_GENERIC 175 %token T_NORETURN 176 177 /* storage classes (extern, static, auto, register and typedef) */ 178 %token <y_scl> T_SCLASS 179 180 /* 181 * predefined type keywords (char, int, short, long, unsigned, signed, 182 * float, double, void); see T_TYPENAME 183 */ 184 %token <y_tspec> T_TYPE 185 186 /* qualifiers (const, volatile, restrict, _Thread_local) */ 187 %token <y_tqual> T_QUAL 188 189 /* struct or union */ 190 %token <y_tspec> T_STRUCT_OR_UNION 191 192 /* remaining keywords */ 193 %token T_ASM 194 %token T_BREAK 195 %token T_CASE 196 %token T_CONTINUE 197 %token T_DEFAULT 198 %token T_DO 199 %token T_ELSE 200 %token T_ENUM 201 %token T_FOR 202 %token T_GOTO 203 %token T_IF 204 %token T_PACKED 205 %token T_RETURN 206 %token T_SWITCH 207 %token T_SYMBOLRENAME 208 %token T_WHILE 209 /* Type Attributes */ 210 %token <y_type> T_ATTRIBUTE 211 %token <y_type> T_AT_ALIAS 212 %token <y_type> T_AT_ALIGNED 213 %token <y_type> T_AT_ALLOC_SIZE 214 %token <y_type> T_AT_ALWAYS_INLINE 215 %token <y_type> T_AT_BOUNDED 216 %token <y_type> T_AT_BUFFER 217 %token <y_type> T_AT_COLD 218 %token <y_type> T_AT_COMMON 219 %token <y_type> T_AT_CONSTRUCTOR 220 %token <y_type> T_AT_DEPRECATED 221 %token <y_type> T_AT_DESTRUCTOR 222 %token <y_type> T_AT_FALLTHROUGH 223 %token <y_type> T_AT_FORMAT 224 %token <y_type> T_AT_FORMAT_ARG 225 %token <y_type> T_AT_FORMAT_GNU_PRINTF 226 %token <y_type> T_AT_FORMAT_PRINTF 227 %token <y_type> T_AT_FORMAT_SCANF 228 %token <y_type> T_AT_FORMAT_STRFMON 229 %token <y_type> T_AT_FORMAT_STRFTIME 230 %token <y_type> T_AT_FORMAT_SYSLOG 231 %token <y_type> T_AT_GNU_INLINE 232 %token <y_type> T_AT_MALLOC 233 %token <y_type> T_AT_MAY_ALIAS 234 %token <y_type> T_AT_MINBYTES 235 %token <y_type> T_AT_MODE 236 %token <y_type> T_AT_NOINLINE 237 %token <y_type> T_AT_NONNULL 238 %token <y_type> T_AT_NONSTRING 239 %token <y_type> T_AT_NORETURN 240 %token <y_type> T_AT_NOTHROW 241 %token <y_type> T_AT_NO_INSTRUMENT_FUNCTION 242 %token <y_type> T_AT_OPTIMIZE 243 %token <y_type> T_AT_PACKED 244 %token <y_type> T_AT_PCS 245 %token <y_type> T_AT_PURE 246 %token <y_type> T_AT_RETURNS_TWICE 247 %token <y_type> T_AT_SECTION 248 %token <y_type> T_AT_SENTINEL 249 %token <y_type> T_AT_STRING 250 %token <y_type> T_AT_TLS_MODEL 251 %token <y_type> T_AT_TUNION 252 %token <y_type> T_AT_UNUSED 253 %token <y_type> T_AT_USED 254 %token <y_type> T_AT_VISIBILITY 255 %token <y_type> T_AT_WARN_UNUSED_RESULT 256 %token <y_type> T_AT_WEAK 257 258 %left T_COMMA 259 %right T_ASSIGN T_OPASSIGN 260 %right T_QUEST T_COLON 261 %left T_LOGOR 262 %left T_LOGAND 263 %left T_BITOR 264 %left T_BITXOR 265 %left T_AMPER 266 %left T_EQUALITY 267 %left T_RELATIONAL 268 %left T_SHIFT 269 %left T_ADDITIVE 270 %left T_ASTERISK T_MULTIPLICATIVE 271 %right T_UNARY T_INCDEC T_SIZEOF T_REAL T_IMAG 272 %left T_LPAREN T_LBRACK T_MEMBACC 273 274 %token <y_sb> T_NAME 275 %token <y_sb> T_TYPENAME 276 %token <y_val> T_CON 277 %token <y_string> T_STRING 278 279 %type <y_sym> func_decl 280 %type <y_sym> notype_decl 281 %type <y_sym> type_decl 282 %type <y_type> typespec 283 %type <y_type> clrtyp_typespec 284 %type <y_type> notype_typespec 285 %type <y_type> struct_spec 286 %type <y_type> enum_spec 287 %type <y_type> type_attribute 288 %type <y_sym> struct_tag 289 %type <y_sym> enum_tag 290 %type <y_tspec> struct 291 %type <y_sym> struct_declaration 292 %type <y_sb> identifier 293 %type <y_sym> member_declaration_list_with_rbrace 294 %type <y_sym> member_declaration_list 295 %type <y_sym> member_declaration 296 %type <y_sym> notype_member_decls 297 %type <y_sym> type_member_decls 298 %type <y_sym> notype_member_decl 299 %type <y_sym> type_member_decl 300 %type <y_tnode> constant_expr 301 %type <y_tnode> array_size 302 %type <y_sym> enum_declaration 303 %type <y_sym> enums_with_opt_comma 304 %type <y_sym> enums 305 %type <y_sym> enumerator 306 %type <y_sym> enumeration_constant 307 %type <y_sym> notype_direct_decl 308 %type <y_sym> type_direct_decl 309 %type <y_pqinf> pointer 310 %type <y_pqinf> asterisk 311 %type <y_sym> param_decl 312 %type <y_sym> param_list 313 %type <y_sym> abstract_decl_param_list 314 %type <y_sym> direct_param_decl 315 %type <y_sym> notype_param_decl 316 %type <y_sym> direct_notype_param_decl 317 %type <y_pqinf> type_qualifier_list 318 %type <y_pqinf> type_qualifier 319 %type <y_sym> identifier_list 320 %type <y_sym> abstract_decl 321 %type <y_sym> direct_abstract_decl 322 %type <y_sym> vararg_parameter_type_list 323 %type <y_sym> parameter_type_list 324 %type <y_sym> parameter_declaration 325 %type <y_tnode> expr 326 %type <y_tnode> expr_statement_val 327 %type <y_tnode> expr_statement_list 328 %type <y_tnode> term 329 %type <y_tnode> generic_expr 330 %type <y_tnode> func_arg_list 331 %type <y_op> point_or_arrow 332 %type <y_type> type_name 333 %type <y_sym> abstract_declaration 334 %type <y_tnode> do_while_expr 335 %type <y_tnode> opt_expr 336 %type <y_string> string 337 %type <y_string> string2 338 %type <y_sb> opt_asm_or_symbolrename 339 %type <y_range> range 340 %type <y_seen_statement> block_item_list 341 %type <y_seen_statement> block_item 342 343 344 %% 345 346 program: 347 /* empty */ { 348 if (sflag) { 349 /* empty translation unit */ 350 error(272); 351 } else if (!tflag) { 352 /* empty translation unit */ 353 warning(272); 354 } 355 } 356 | translation_unit 357 ; 358 359 translation_unit: /* C99 6.9 */ 360 external_declaration 361 | translation_unit external_declaration 362 ; 363 364 external_declaration: /* C99 6.9 */ 365 asm_statement 366 | function_definition { 367 global_clean_up_decl(false); 368 clear_warning_flags(); 369 } 370 | top_level_declaration { 371 global_clean_up_decl(false); 372 clear_warning_flags(); 373 } 374 ; 375 376 /* 377 * On the top level, lint allows several forms of declarations that it doesn't 378 * allow in functions. For example, a single ';' is an empty declaration and 379 * is supported by some compilers, but in a function it would be an empty 380 * statement, not a declaration. This makes a difference in C90 mode, where 381 * a statement must not be followed by a declaration. 382 * 383 * See 'declaration' for all other declarations. 384 */ 385 top_level_declaration: /* C99 6.9 calls this 'declaration' */ 386 T_SEMI { 387 if (sflag) { 388 /* empty declaration */ 389 error(0); 390 } else if (!tflag) { 391 /* empty declaration */ 392 warning(0); 393 } 394 } 395 | clrtyp deftyp notype_init_decls T_SEMI { 396 if (sflag) { 397 /* old style declaration; add 'int' */ 398 error(1); 399 } else if (!tflag) { 400 /* old style declaration; add 'int' */ 401 warning(1); 402 } 403 } 404 | declmods deftyp T_SEMI { 405 if (dcs->d_scl == TYPEDEF) { 406 /* typedef declares no type name */ 407 warning(72); 408 } else { 409 /* empty declaration */ 410 warning(2); 411 } 412 } 413 | declmods deftyp notype_init_decls T_SEMI 414 | declaration_specifiers deftyp T_SEMI { 415 if (dcs->d_scl == TYPEDEF) { 416 /* typedef declares no type name */ 417 warning(72); 418 } else if (!dcs->d_nonempty_decl) { 419 /* empty declaration */ 420 warning(2); 421 } 422 } 423 | declaration_specifiers deftyp type_init_decls T_SEMI 424 | error T_SEMI { 425 global_clean_up(); 426 } 427 | error T_RBRACE { 428 global_clean_up(); 429 } 430 ; 431 432 function_definition: /* C99 6.9.1 */ 433 func_decl { 434 if ($1->s_type->t_tspec != FUNC) { 435 /* syntax error '%s' */ 436 error(249, yytext); 437 YYERROR; 438 } 439 if ($1->s_type->t_typedef) { 440 /* ()-less function definition */ 441 error(64); 442 YYERROR; 443 } 444 funcdef($1); 445 block_level++; 446 begin_declaration_level(ARG); 447 if (lwarn == LWARN_NONE) 448 $1->s_used = true; 449 } arg_declaration_list_opt { 450 end_declaration_level(); 451 block_level--; 452 check_func_lint_directives(); 453 check_func_old_style_arguments(); 454 begin_control_statement(CS_FUNCTION_BODY); 455 } compound_statement { 456 funcend(); 457 end_control_statement(CS_FUNCTION_BODY); 458 } 459 ; 460 461 func_decl: 462 clrtyp deftyp notype_decl { 463 $$ = $3; 464 } 465 | declmods deftyp notype_decl { 466 $$ = $3; 467 } 468 | declaration_specifiers deftyp type_decl { 469 $$ = $3; 470 } 471 ; 472 473 arg_declaration_list_opt: /* C99 6.9.1p13 example 1 */ 474 /* empty */ 475 | arg_declaration_list 476 ; 477 478 arg_declaration_list: /* C99 6.9.1p13 example 1 */ 479 arg_declaration 480 | arg_declaration_list arg_declaration 481 /* XXX or better "arg_declaration error" ? */ 482 | error 483 ; 484 485 /* 486 * "arg_declaration" is separated from "declaration" because it 487 * needs other error handling. 488 */ 489 arg_declaration: 490 declmods deftyp T_SEMI { 491 /* empty declaration */ 492 warning(2); 493 } 494 | declmods deftyp notype_init_decls T_SEMI 495 | declaration_specifiers deftyp T_SEMI { 496 if (!dcs->d_nonempty_decl) { 497 /* empty declaration */ 498 warning(2); 499 } else { 500 /* '%s' declared in argument declaration list */ 501 warning(3, type_name(dcs->d_type)); 502 } 503 } 504 | declaration_specifiers deftyp type_init_decls T_SEMI { 505 if (dcs->d_nonempty_decl) { 506 /* '%s' declared in argument declaration list */ 507 warning(3, type_name(dcs->d_type)); 508 } 509 } 510 | declmods error 511 | declaration_specifiers error 512 ; 513 514 declaration: /* C99 6.7 */ 515 declmods deftyp T_SEMI { 516 if (dcs->d_scl == TYPEDEF) { 517 /* typedef declares no type name */ 518 warning(72); 519 } else { 520 /* empty declaration */ 521 warning(2); 522 } 523 } 524 | declmods deftyp notype_init_decls T_SEMI 525 | declaration_specifiers deftyp T_SEMI { 526 if (dcs->d_scl == TYPEDEF) { 527 /* typedef declares no type name */ 528 warning(72); 529 } else if (!dcs->d_nonempty_decl) { 530 /* empty declaration */ 531 warning(2); 532 } 533 } 534 | declaration_specifiers deftyp type_init_decls T_SEMI 535 | error T_SEMI 536 ; 537 538 type_attribute_format_type: 539 T_AT_FORMAT_GNU_PRINTF 540 | T_AT_FORMAT_PRINTF 541 | T_AT_FORMAT_SCANF 542 | T_AT_FORMAT_STRFMON 543 | T_AT_FORMAT_STRFTIME 544 | T_AT_FORMAT_SYSLOG 545 ; 546 547 type_attribute_bounded_type: 548 T_AT_MINBYTES 549 | T_AT_STRING 550 | T_AT_BUFFER 551 ; 552 553 554 type_attribute_spec: 555 /* empty */ 556 | T_AT_ALWAYS_INLINE 557 | T_AT_ALIAS T_LPAREN string T_RPAREN 558 | T_AT_ALIGNED T_LPAREN constant_expr T_RPAREN 559 | T_AT_ALIGNED 560 | T_AT_ALLOC_SIZE T_LPAREN constant_expr T_COMMA constant_expr T_RPAREN 561 | T_AT_ALLOC_SIZE T_LPAREN constant_expr T_RPAREN 562 | T_AT_BOUNDED T_LPAREN type_attribute_bounded_type 563 T_COMMA constant_expr T_COMMA constant_expr T_RPAREN 564 | T_AT_COLD 565 | T_AT_COMMON 566 | T_AT_CONSTRUCTOR T_LPAREN constant_expr T_RPAREN 567 | T_AT_CONSTRUCTOR 568 | T_AT_DEPRECATED T_LPAREN string T_RPAREN 569 | T_AT_DEPRECATED 570 | T_AT_DESTRUCTOR T_LPAREN constant_expr T_RPAREN 571 | T_AT_DESTRUCTOR 572 | T_AT_FALLTHROUGH { 573 fallthru(1); 574 } 575 | T_AT_FORMAT T_LPAREN type_attribute_format_type T_COMMA 576 constant_expr T_COMMA constant_expr T_RPAREN 577 | T_AT_FORMAT_ARG T_LPAREN constant_expr T_RPAREN 578 | T_AT_GNU_INLINE 579 | T_AT_MALLOC 580 | T_AT_MAY_ALIAS 581 | T_AT_MODE T_LPAREN T_NAME T_RPAREN 582 | T_AT_NOINLINE 583 | T_AT_NONNULL T_LPAREN constant_expr_list_opt T_RPAREN 584 | T_AT_NONNULL 585 | T_AT_NONSTRING 586 | T_AT_NORETURN 587 | T_AT_NOTHROW 588 | T_AT_NO_INSTRUMENT_FUNCTION 589 | T_AT_OPTIMIZE T_LPAREN string T_RPAREN 590 | T_AT_PACKED { 591 addpacked(); 592 } 593 | T_AT_PCS T_LPAREN string T_RPAREN 594 | T_AT_PURE 595 | T_AT_RETURNS_TWICE 596 | T_AT_SECTION T_LPAREN string T_RPAREN 597 | T_AT_SENTINEL T_LPAREN constant_expr T_RPAREN 598 | T_AT_SENTINEL 599 | T_AT_TLS_MODEL T_LPAREN string T_RPAREN 600 | T_AT_TUNION 601 | T_AT_UNUSED { 602 add_attr_used(); 603 } 604 | T_AT_USED { 605 add_attr_used(); 606 } 607 | T_AT_VISIBILITY T_LPAREN constant_expr T_RPAREN 608 | T_AT_WARN_UNUSED_RESULT 609 | T_AT_WEAK 610 | T_QUAL { 611 if ($1 != CONST) 612 yyerror("Bad attribute"); 613 } 614 ; 615 616 type_attribute_spec_list: 617 type_attribute_spec 618 | type_attribute_spec_list T_COMMA type_attribute_spec 619 ; 620 621 align_as: 622 typespec 623 | constant_expr 624 ; 625 626 type_attribute: 627 T_ATTRIBUTE T_LPAREN T_LPAREN { 628 attron = true; 629 } type_attribute_spec_list { 630 attron = false; 631 } T_RPAREN T_RPAREN 632 | T_ALIGNAS T_LPAREN align_as T_RPAREN { 633 } 634 | T_PACKED { 635 addpacked(); 636 } 637 | T_NORETURN { 638 } 639 ; 640 641 type_attribute_list: 642 type_attribute 643 | type_attribute_list type_attribute 644 ; 645 646 clrtyp: 647 /* empty */ { 648 clrtyp(); 649 } 650 ; 651 652 deftyp: 653 /* empty */ { 654 deftyp(); 655 } 656 ; 657 658 declaration_specifiers: /* C99 6.7 */ 659 clrtyp_typespec { 660 add_type($1); 661 } 662 | declmods typespec { 663 add_type($2); 664 } 665 | type_attribute declaration_specifiers 666 | declaration_specifiers declmod 667 | declaration_specifiers notype_typespec { 668 add_type($2); 669 } 670 ; 671 672 declmods: 673 clrtyp T_QUAL { 674 add_qualifier($2); 675 } 676 | clrtyp T_SCLASS { 677 add_storage_class($2); 678 } 679 | declmods declmod 680 ; 681 682 declmod: 683 T_QUAL { 684 add_qualifier($1); 685 } 686 | T_SCLASS { 687 add_storage_class($1); 688 } 689 | type_attribute_list 690 ; 691 692 clrtyp_typespec: 693 clrtyp notype_typespec { 694 $$ = $2; 695 } 696 | T_TYPENAME clrtyp { 697 $$ = getsym($1)->s_type; 698 } 699 ; 700 701 typespec: 702 notype_typespec { 703 $$ = $1; 704 } 705 | T_TYPENAME { 706 $$ = getsym($1)->s_type; 707 } 708 ; 709 710 notype_typespec: 711 T_TYPE { 712 $$ = gettyp($1); 713 } 714 | T_TYPEOF term { 715 $$ = $2->tn_type; 716 } 717 | struct_spec { 718 end_declaration_level(); 719 $$ = $1; 720 } 721 | enum_spec { 722 end_declaration_level(); 723 $$ = $1; 724 } 725 ; 726 727 struct_spec: 728 struct struct_tag { 729 /* 730 * STDC requires that "struct a;" always introduces 731 * a new tag if "a" is not declared at current level 732 * 733 * yychar is valid because otherwise the parser would not 734 * have been able to decide if it must shift or reduce 735 */ 736 $$ = mktag($2, $1, false, yychar == T_SEMI); 737 } 738 | struct struct_tag { 739 dcs->d_tagtyp = mktag($2, $1, true, false); 740 } struct_declaration { 741 $$ = complete_tag_struct_or_union(dcs->d_tagtyp, $4); 742 } 743 | struct { 744 dcs->d_tagtyp = mktag(NULL, $1, true, false); 745 } struct_declaration { 746 $$ = complete_tag_struct_or_union(dcs->d_tagtyp, $3); 747 } 748 | struct error { 749 symtyp = FVFT; 750 $$ = gettyp(INT); 751 } 752 ; 753 754 struct: 755 struct type_attribute 756 | T_STRUCT_OR_UNION { 757 symtyp = FTAG; 758 begin_declaration_level($1 == STRUCT ? MOS : MOU); 759 dcs->d_offset = 0; 760 dcs->d_stralign = CHAR_SIZE; 761 $$ = $1; 762 } 763 ; 764 765 struct_tag: 766 identifier { 767 $$ = getsym($1); 768 } 769 ; 770 771 struct_declaration: 772 struct_decl_lbrace member_declaration_list_with_rbrace { 773 $$ = $2; 774 } 775 ; 776 777 struct_decl_lbrace: 778 T_LBRACE { 779 symtyp = FVFT; 780 } 781 ; 782 783 member_declaration_list_with_rbrace: 784 member_declaration_list T_SEMI T_RBRACE { 785 $$ = $1; 786 } 787 | member_declaration_list T_RBRACE { 788 if (sflag) { 789 /* syntax req. ';' after last struct/union member */ 790 error(66); 791 } else { 792 /* syntax req. ';' after last struct/union member */ 793 warning(66); 794 } 795 $$ = $1; 796 } 797 | T_RBRACE { 798 $$ = NULL; 799 } 800 ; 801 802 opt_type_attribute: 803 /* empty */ 804 | type_attribute 805 ; 806 807 member_declaration_list: 808 member_declaration { 809 $$ = $1; 810 } 811 | member_declaration_list T_SEMI member_declaration { 812 $$ = lnklst($1, $3); 813 } 814 ; 815 816 member_declaration: 817 noclass_declmods deftyp { 818 /* too late, i know, but getsym() compensates it */ 819 symtyp = FMEMBER; 820 } notype_member_decls opt_type_attribute { 821 symtyp = FVFT; 822 $$ = $4; 823 } 824 | noclass_declspecs deftyp { 825 symtyp = FMEMBER; 826 } type_member_decls opt_type_attribute { 827 symtyp = FVFT; 828 $$ = $4; 829 } 830 | noclass_declmods deftyp opt_type_attribute { 831 symtyp = FVFT; 832 /* struct or union member must be named */ 833 if (!Sflag) 834 /* anonymous struct/union members is a C9X feature */ 835 warning(49); 836 /* add all the members of the anonymous struct/union */ 837 $$ = dcs->d_type->t_str->sou_first_member; 838 anonymize($$); 839 } 840 | noclass_declspecs deftyp opt_type_attribute { 841 symtyp = FVFT; 842 /* struct or union member must be named */ 843 if (!Sflag) 844 /* anonymous struct/union members is a C9X feature */ 845 warning(49); 846 $$ = dcs->d_type->t_str->sou_first_member; 847 /* add all the members of the anonymous struct/union */ 848 anonymize($$); 849 } 850 | error { 851 symtyp = FVFT; 852 $$ = NULL; 853 } 854 ; 855 856 noclass_declspecs: 857 clrtyp_typespec { 858 add_type($1); 859 } 860 | type_attribute noclass_declspecs 861 | noclass_declmods typespec { 862 add_type($2); 863 } 864 | noclass_declspecs T_QUAL { 865 add_qualifier($2); 866 } 867 | noclass_declspecs notype_typespec { 868 add_type($2); 869 } 870 | noclass_declspecs type_attribute 871 ; 872 873 noclass_declmods: 874 clrtyp T_QUAL { 875 add_qualifier($2); 876 } 877 | noclass_declmods T_QUAL { 878 add_qualifier($2); 879 } 880 ; 881 882 notype_member_decls: 883 notype_member_decl { 884 $$ = declarator_1_struct_union($1); 885 } 886 | notype_member_decls { 887 symtyp = FMEMBER; 888 } T_COMMA type_member_decl { 889 $$ = lnklst($1, declarator_1_struct_union($4)); 890 } 891 ; 892 893 type_member_decls: 894 type_member_decl { 895 $$ = declarator_1_struct_union($1); 896 } 897 | type_member_decls { 898 symtyp = FMEMBER; 899 } T_COMMA type_member_decl { 900 $$ = lnklst($1, declarator_1_struct_union($4)); 901 } 902 ; 903 904 notype_member_decl: 905 notype_decl { 906 $$ = $1; 907 } 908 | notype_decl T_COLON constant_expr { /* C99 6.7.2.1 */ 909 $$ = bitfield($1, to_int_constant($3, true)); 910 } 911 | { 912 symtyp = FVFT; 913 } T_COLON constant_expr { /* C99 6.7.2.1 */ 914 $$ = bitfield(NULL, to_int_constant($3, true)); 915 } 916 ; 917 918 type_member_decl: 919 type_decl { 920 $$ = $1; 921 } 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 $$ = getsym($1); 962 } 963 ; 964 965 enum_declaration: 966 enum_decl_lbrace enums_with_opt_comma T_RBRACE { 967 $$ = $2; 968 } 969 ; 970 971 enum_decl_lbrace: 972 T_LBRACE { 973 symtyp = FVFT; 974 enumval = 0; 975 } 976 ; 977 978 enums_with_opt_comma: 979 enums { 980 $$ = $1; 981 } 982 | enums T_COMMA { 983 if (sflag) { 984 /* trailing ',' prohibited in enum declaration */ 985 error(54); 986 } else { 987 /* trailing ',' prohibited in enum declaration */ 988 c99ism(54); 989 } 990 $$ = $1; 991 } 992 ; 993 994 enums: 995 enumerator { 996 $$ = $1; 997 } 998 | enums T_COMMA enumerator { 999 $$ = lnklst($1, $3); 1000 } 1001 | error { 1002 $$ = NULL; 1003 } 1004 ; 1005 1006 enumerator: 1007 enumeration_constant { 1008 $$ = enumeration_constant($1, enumval, true); 1009 } 1010 | enumeration_constant T_ASSIGN constant_expr { 1011 $$ = enumeration_constant($1, to_int_constant($3, true), false); 1012 } 1013 ; 1014 1015 enumeration_constant: /* C99 6.4.4.3 */ 1016 identifier { 1017 $$ = getsym($1); 1018 } 1019 ; 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 opt_asm_or_symbolrename { 1034 cgram_declare($1, false, $2); 1035 check_size($1); 1036 } 1037 | notype_decl opt_asm_or_symbolrename { 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 opt_asm_or_symbolrename { 1048 cgram_declare($1, false, $2); 1049 check_size($1); 1050 } 1051 | type_decl opt_asm_or_symbolrename { 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 $$ = $1; 1063 } 1064 | pointer notype_direct_decl { 1065 $$ = add_pointer($2, $1); 1066 } 1067 ; 1068 1069 notype_direct_decl: 1070 T_NAME { 1071 $$ = declarator_name(getsym($1)); 1072 } 1073 | T_LPAREN type_decl T_RPAREN { 1074 $$ = $2; 1075 } 1076 | type_attribute notype_direct_decl { 1077 $$ = $2; 1078 } 1079 | notype_direct_decl T_LBRACK T_RBRACK { 1080 $$ = add_array($1, false, 0); 1081 } 1082 | notype_direct_decl T_LBRACK array_size T_RBRACK { 1083 $$ = add_array($1, true, to_int_constant($3, false)); 1084 } 1085 | notype_direct_decl param_list opt_asm_or_symbolrename { 1086 $$ = add_function(symbolrename($1, $3), $2); 1087 end_declaration_level(); 1088 block_level--; 1089 } 1090 | notype_direct_decl type_attribute_list 1091 ; 1092 1093 type_decl: 1094 type_direct_decl { 1095 $$ = $1; 1096 } 1097 | pointer type_direct_decl { 1098 $$ = add_pointer($2, $1); 1099 } 1100 ; 1101 1102 type_direct_decl: 1103 identifier { 1104 $$ = declarator_name(getsym($1)); 1105 } 1106 | T_LPAREN type_decl T_RPAREN { 1107 $$ = $2; 1108 } 1109 | type_attribute type_direct_decl { 1110 $$ = $2; 1111 } 1112 | type_direct_decl T_LBRACK T_RBRACK { 1113 $$ = add_array($1, false, 0); 1114 } 1115 | type_direct_decl T_LBRACK array_size T_RBRACK { 1116 $$ = add_array($1, true, to_int_constant($3, false)); 1117 } 1118 | type_direct_decl param_list opt_asm_or_symbolrename { 1119 $$ = add_function(symbolrename($1, $3), $2); 1120 end_declaration_level(); 1121 block_level--; 1122 } 1123 | type_direct_decl type_attribute_list 1124 ; 1125 1126 /* 1127 * param_decl and notype_param_decl exist to avoid a conflict in 1128 * argument lists. A typename enclosed in parens should always be 1129 * treated as a typename, not an argument. 1130 * "typedef int a; f(int (a));" is "typedef int a; f(int foo(a));" 1131 * not "typedef int a; f(int a);" 1132 */ 1133 param_decl: 1134 direct_param_decl { 1135 $$ = $1; 1136 } 1137 | pointer direct_param_decl { 1138 $$ = add_pointer($2, $1); 1139 } 1140 ; 1141 1142 opt_type_qualifier_list: 1143 /* empty */ 1144 | type_qualifier_list 1145 ; 1146 1147 array_size: 1148 opt_type_qualifier_list T_SCLASS constant_expr { 1149 /* C11 6.7.6.3p7 */ 1150 if ($2 != STATIC) 1151 yyerror("Bad attribute"); 1152 /* static array size is a C11 extension */ 1153 c11ism(343); 1154 $$ = $3; 1155 } 1156 | constant_expr { 1157 $$ = $1; 1158 } 1159 ; 1160 1161 direct_param_decl: 1162 identifier type_attribute_list { 1163 $$ = declarator_name(getsym($1)); 1164 } 1165 | identifier { 1166 $$ = declarator_name(getsym($1)); 1167 } 1168 | T_LPAREN notype_param_decl T_RPAREN { 1169 $$ = $2; 1170 } 1171 | direct_param_decl T_LBRACK T_RBRACK { 1172 $$ = add_array($1, false, 0); 1173 } 1174 | direct_param_decl T_LBRACK array_size T_RBRACK { 1175 $$ = add_array($1, true, to_int_constant($3, false)); 1176 } 1177 | direct_param_decl param_list opt_asm_or_symbolrename { 1178 $$ = add_function(symbolrename($1, $3), $2); 1179 end_declaration_level(); 1180 block_level--; 1181 } 1182 ; 1183 1184 notype_param_decl: 1185 direct_notype_param_decl { 1186 $$ = $1; 1187 } 1188 | pointer direct_notype_param_decl { 1189 $$ = add_pointer($2, $1); 1190 } 1191 ; 1192 1193 direct_notype_param_decl: 1194 identifier { 1195 $$ = declarator_name(getsym($1)); 1196 } 1197 | T_LPAREN notype_param_decl T_RPAREN { 1198 $$ = $2; 1199 } 1200 | direct_notype_param_decl T_LBRACK T_RBRACK { 1201 $$ = add_array($1, false, 0); 1202 } 1203 | direct_notype_param_decl T_LBRACK array_size T_RBRACK { 1204 $$ = add_array($1, true, to_int_constant($3, false)); 1205 } 1206 | direct_notype_param_decl param_list opt_asm_or_symbolrename { 1207 $$ = add_function(symbolrename($1, $3), $2); 1208 end_declaration_level(); 1209 block_level--; 1210 } 1211 ; 1212 1213 pointer: 1214 asterisk { 1215 $$ = $1; 1216 } 1217 | asterisk type_qualifier_list { 1218 $$ = merge_pointers_and_qualifiers($1, $2); 1219 } 1220 | asterisk pointer { 1221 $$ = merge_pointers_and_qualifiers($1, $2); 1222 } 1223 | asterisk type_qualifier_list pointer { 1224 $$ = merge_pointers_and_qualifiers($1, $2); 1225 $$ = merge_pointers_and_qualifiers($$, $3); 1226 } 1227 ; 1228 1229 asterisk: 1230 T_ASTERISK { 1231 $$ = xcalloc(1, sizeof(*$$)); 1232 $$->p_pcnt = 1; 1233 } 1234 ; 1235 1236 type_qualifier_list: 1237 type_qualifier { 1238 $$ = $1; 1239 } 1240 | type_qualifier_list type_qualifier { 1241 $$ = merge_pointers_and_qualifiers($1, $2); 1242 } 1243 ; 1244 1245 type_qualifier: 1246 T_QUAL { 1247 $$ = xcalloc(1, sizeof(*$$)); 1248 if ($1 == CONST) { 1249 $$->p_const = true; 1250 } else if ($1 == VOLATILE) { 1251 $$->p_volatile = true; 1252 } else { 1253 lint_assert($1 == RESTRICT || $1 == THREAD); 1254 } 1255 } 1256 ; 1257 1258 param_list: 1259 id_list_lparen identifier_list T_RPAREN { 1260 $$ = $2; 1261 } 1262 | abstract_decl_param_list { 1263 $$ = $1; 1264 } 1265 ; 1266 1267 id_list_lparen: 1268 T_LPAREN { 1269 block_level++; 1270 begin_declaration_level(PROTO_ARG); 1271 } 1272 ; 1273 1274 identifier_list: 1275 T_NAME { 1276 $$ = old_style_function_name(getsym($1)); 1277 } 1278 | identifier_list T_COMMA T_NAME { 1279 $$ = lnklst($1, old_style_function_name(getsym($3))); 1280 } 1281 | identifier_list error { 1282 $$ = $1; 1283 } 1284 ; 1285 1286 abstract_decl_param_list: 1287 abstract_decl_lparen T_RPAREN opt_type_attribute { 1288 $$ = NULL; 1289 } 1290 | abstract_decl_lparen vararg_parameter_type_list T_RPAREN opt_type_attribute { 1291 dcs->d_proto = true; 1292 $$ = $2; 1293 } 1294 | abstract_decl_lparen error T_RPAREN opt_type_attribute { 1295 $$ = NULL; 1296 } 1297 ; 1298 1299 abstract_decl_lparen: 1300 T_LPAREN { 1301 block_level++; 1302 begin_declaration_level(PROTO_ARG); 1303 } 1304 ; 1305 1306 vararg_parameter_type_list: 1307 parameter_type_list { 1308 $$ = $1; 1309 } 1310 | parameter_type_list T_COMMA T_ELLIPSIS { 1311 dcs->d_vararg = true; 1312 $$ = $1; 1313 } 1314 | T_ELLIPSIS { 1315 if (sflag) { 1316 /* ANSI C requires formal parameter before '...' */ 1317 error(84); 1318 } else if (!tflag) { 1319 /* ANSI C requires formal parameter before '...' */ 1320 warning(84); 1321 } 1322 dcs->d_vararg = true; 1323 $$ = NULL; 1324 } 1325 ; 1326 1327 parameter_type_list: 1328 parameter_declaration { 1329 $$ = $1; 1330 } 1331 | parameter_type_list T_COMMA parameter_declaration { 1332 $$ = lnklst($1, $3); 1333 } 1334 ; 1335 1336 parameter_declaration: 1337 declmods deftyp { 1338 $$ = declare_argument(abstract_name(), false); 1339 } 1340 | declaration_specifiers deftyp { 1341 $$ = declare_argument(abstract_name(), false); 1342 } 1343 | declmods deftyp notype_param_decl { 1344 $$ = declare_argument($3, false); 1345 } 1346 /* 1347 * param_decl is needed because of following conflict: 1348 * "typedef int a; f(int (a));" could be parsed as 1349 * "function with argument a of type int", or 1350 * "function with an abstract argument of type function". 1351 * This grammar realizes the second case. 1352 */ 1353 | declaration_specifiers deftyp param_decl { 1354 $$ = declare_argument($3, false); 1355 } 1356 | declmods deftyp abstract_decl { 1357 $$ = declare_argument($3, false); 1358 } 1359 | declaration_specifiers deftyp abstract_decl { 1360 $$ = declare_argument($3, false); 1361 } 1362 ; 1363 1364 opt_asm_or_symbolrename: /* expect only one */ 1365 /* empty */ { 1366 $$ = NULL; 1367 } 1368 | T_ASM T_LPAREN T_STRING T_RPAREN { 1369 freeyyv(&$3, T_STRING); 1370 $$ = NULL; 1371 } 1372 | T_SYMBOLRENAME T_LPAREN T_NAME T_RPAREN { 1373 $$ = $3; 1374 } 1375 ; 1376 1377 initializer: /* C99 6.7.8 "Initialization" */ 1378 expr %prec T_COMMA { 1379 init_expr($1); 1380 } 1381 | init_lbrace init_rbrace { 1382 /* XXX: Empty braces are not covered by C99 6.7.8. */ 1383 } 1384 | init_lbrace initializer_list comma_opt init_rbrace 1385 | error 1386 ; 1387 1388 initializer_list: /* C99 6.7.8 "Initialization" */ 1389 initializer_list_item 1390 | initializer_list T_COMMA initializer_list_item 1391 ; 1392 1393 initializer_list_item: 1394 designation initializer 1395 | initializer 1396 ; 1397 1398 range: 1399 constant_expr { 1400 $$.lo = to_int_constant($1, true); 1401 $$.hi = $$.lo; 1402 } 1403 | constant_expr T_ELLIPSIS constant_expr { 1404 $$.lo = to_int_constant($1, true); 1405 $$.hi = to_int_constant($3, true); 1406 /* initialization with '[a...b]' is a GNU extension */ 1407 gnuism(340); 1408 } 1409 ; 1410 1411 designator: /* C99 6.7.8 "Initialization" */ 1412 T_LBRACK range T_RBRACK { 1413 add_designator_subscript($2); 1414 if (!Sflag) 1415 /* array initializer with des.s is a C9X feature */ 1416 warning(321); 1417 } 1418 | point identifier { 1419 if (!Sflag) 1420 /* struct or union member name in initializer is ... */ 1421 warning(313); 1422 add_designator_member($2); 1423 } 1424 ; 1425 1426 designator_list: /* C99 6.7.8 "Initialization" */ 1427 designator 1428 | designator_list designator 1429 ; 1430 1431 designation: /* C99 6.7.8 "Initialization" */ 1432 designator_list T_ASSIGN 1433 | identifier T_COLON { 1434 /* GCC style struct or union member name in initializer */ 1435 gnuism(315); 1436 add_designator_member($1); 1437 } 1438 ; 1439 1440 init_lbrace: 1441 T_LBRACE { 1442 init_lbrace(); 1443 } 1444 ; 1445 1446 init_rbrace: 1447 T_RBRACE { 1448 init_rbrace(); 1449 } 1450 ; 1451 1452 type_name: 1453 { 1454 begin_declaration_level(ABSTRACT); 1455 } abstract_declaration { 1456 end_declaration_level(); 1457 $$ = $2->s_type; 1458 } 1459 ; 1460 1461 abstract_declaration: 1462 noclass_declmods deftyp { 1463 $$ = declare_1_abstract(abstract_name()); 1464 } 1465 | noclass_declspecs deftyp { 1466 $$ = declare_1_abstract(abstract_name()); 1467 } 1468 | noclass_declmods deftyp abstract_decl { 1469 $$ = declare_1_abstract($3); 1470 } 1471 | noclass_declspecs deftyp abstract_decl { 1472 $$ = declare_1_abstract($3); 1473 } 1474 ; 1475 1476 abstract_decl: 1477 pointer { 1478 $$ = add_pointer(abstract_name(), $1); 1479 } 1480 | direct_abstract_decl { 1481 $$ = $1; 1482 } 1483 | pointer direct_abstract_decl { 1484 $$ = add_pointer($2, $1); 1485 } 1486 | T_TYPEOF term { 1487 $$ = mktempsym($2->tn_type); 1488 } 1489 ; 1490 1491 direct_abstract_decl: 1492 T_LPAREN abstract_decl T_RPAREN { 1493 $$ = $2; 1494 } 1495 | T_LBRACK T_RBRACK { 1496 $$ = add_array(abstract_name(), false, 0); 1497 } 1498 | T_LBRACK array_size T_RBRACK { 1499 $$ = add_array(abstract_name(), true, to_int_constant($2, false)); 1500 } 1501 | type_attribute direct_abstract_decl { 1502 $$ = $2; 1503 } 1504 | direct_abstract_decl T_LBRACK T_RBRACK { 1505 $$ = add_array($1, false, 0); 1506 } 1507 | direct_abstract_decl T_LBRACK array_size T_RBRACK { 1508 $$ = add_array($1, true, to_int_constant($3, false)); 1509 } 1510 | abstract_decl_param_list opt_asm_or_symbolrename { 1511 $$ = add_function(symbolrename(abstract_name(), $2), $1); 1512 end_declaration_level(); 1513 block_level--; 1514 } 1515 | direct_abstract_decl abstract_decl_param_list opt_asm_or_symbolrename { 1516 $$ = add_function(symbolrename($1, $3), $2); 1517 end_declaration_level(); 1518 block_level--; 1519 } 1520 | direct_abstract_decl type_attribute_list 1521 ; 1522 1523 non_expr_statement: 1524 type_attribute T_SEMI 1525 | labeled_statement 1526 | compound_statement 1527 | selection_statement 1528 | iteration_statement 1529 | jump_statement { 1530 seen_fallthrough = false; 1531 } 1532 | asm_statement 1533 ; 1534 1535 statement: /* C99 6.8 */ 1536 expr_statement 1537 | non_expr_statement 1538 ; 1539 1540 labeled_statement: /* C99 6.8.1 */ 1541 label opt_type_attribute statement 1542 ; 1543 1544 label: 1545 T_NAME T_COLON { 1546 symtyp = FLABEL; 1547 named_label(getsym($1)); 1548 } 1549 | T_CASE constant_expr T_COLON { 1550 case_label($2); 1551 seen_fallthrough = true; 1552 } 1553 | T_CASE constant_expr T_ELLIPSIS constant_expr T_COLON { 1554 /* XXX: We don't fill all cases */ 1555 case_label($2); 1556 seen_fallthrough = true; 1557 } 1558 | T_DEFAULT T_COLON { 1559 default_label(); 1560 seen_fallthrough = true; 1561 } 1562 ; 1563 1564 compound_statement: /* C99 6.8.2 */ 1565 compound_statement_lbrace compound_statement_rbrace 1566 | compound_statement_lbrace block_item_list compound_statement_rbrace 1567 ; 1568 1569 compound_statement_lbrace: 1570 T_LBRACE { 1571 block_level++; 1572 mem_block_level++; 1573 begin_declaration_level(AUTO); 1574 } 1575 ; 1576 1577 compound_statement_rbrace: 1578 T_RBRACE { 1579 end_declaration_level(); 1580 freeblk(); 1581 mem_block_level--; 1582 block_level--; 1583 seen_fallthrough = false; 1584 } 1585 ; 1586 1587 block_item_list: 1588 block_item 1589 | block_item_list block_item { 1590 if (!Sflag && $1 && !$2) 1591 /* declarations after statements is a C99 feature */ 1592 c99ism(327); 1593 } 1594 ; 1595 1596 block_item: 1597 statement { 1598 $$ = true; 1599 restore_warning_flags(); 1600 } 1601 | declaration { 1602 $$ = false; 1603 restore_warning_flags(); 1604 } 1605 ; 1606 1607 expr_statement: 1608 expr T_SEMI { 1609 expr($1, false, false, false, false); 1610 seen_fallthrough = false; 1611 } 1612 | T_SEMI { 1613 seen_fallthrough = false; 1614 } 1615 ; 1616 1617 /* 1618 * The following two productions are used to implement 1619 * ({ [[decl-list] stmt-list] }). 1620 * XXX: This is not well tested. 1621 */ 1622 expr_statement_val: 1623 expr T_SEMI { 1624 /* XXX: We should really do that only on the last name */ 1625 if ($1->tn_op == NAME) 1626 $1->tn_sym->s_used = true; 1627 $$ = $1; 1628 expr($1, false, false, false, false); 1629 seen_fallthrough = false; 1630 } 1631 | non_expr_statement { 1632 $$ = expr_zalloc_tnode(); 1633 $$->tn_type = gettyp(VOID); 1634 } 1635 ; 1636 1637 expr_statement_list: 1638 expr_statement_val 1639 | expr_statement_list expr_statement_val { 1640 $$ = $2; 1641 } 1642 ; 1643 1644 selection_statement: /* C99 6.8.4 */ 1645 if_without_else { 1646 save_warning_flags(); 1647 if2(); 1648 if3(false); 1649 } 1650 | if_without_else T_ELSE { 1651 save_warning_flags(); 1652 if2(); 1653 } statement { 1654 clear_warning_flags(); 1655 if3(true); 1656 } 1657 | if_without_else T_ELSE error { 1658 clear_warning_flags(); 1659 if3(false); 1660 } 1661 | switch_expr statement { 1662 clear_warning_flags(); 1663 switch2(); 1664 } 1665 | switch_expr error { 1666 clear_warning_flags(); 1667 switch2(); 1668 } 1669 ; 1670 1671 if_without_else: 1672 if_expr statement 1673 | if_expr error 1674 ; 1675 1676 if_expr: 1677 T_IF T_LPAREN expr T_RPAREN { 1678 if1($3); 1679 clear_warning_flags(); 1680 } 1681 ; 1682 1683 switch_expr: 1684 T_SWITCH T_LPAREN expr T_RPAREN { 1685 switch1($3); 1686 clear_warning_flags(); 1687 } 1688 ; 1689 1690 association: 1691 type_name T_COLON expr 1692 | T_DEFAULT T_COLON expr 1693 ; 1694 1695 association_list: 1696 association 1697 | association_list T_COMMA association 1698 ; 1699 1700 generic_expr: 1701 T_GENERIC T_LPAREN expr T_COMMA association_list T_RPAREN { 1702 $$ = $3; 1703 } 1704 ; 1705 1706 do_statement: 1707 do statement { 1708 clear_warning_flags(); 1709 } 1710 ; 1711 1712 iteration_statement: /* C99 6.8.5 */ 1713 while_expr statement { 1714 clear_warning_flags(); 1715 while2(); 1716 } 1717 | while_expr error { 1718 clear_warning_flags(); 1719 while2(); 1720 } 1721 | do_statement do_while_expr { 1722 do2($2); 1723 seen_fallthrough = false; 1724 } 1725 | do error { 1726 clear_warning_flags(); 1727 do2(NULL); 1728 } 1729 | for_exprs statement { 1730 clear_warning_flags(); 1731 for2(); 1732 end_declaration_level(); 1733 block_level--; 1734 } 1735 | for_exprs error { 1736 clear_warning_flags(); 1737 for2(); 1738 end_declaration_level(); 1739 block_level--; 1740 } 1741 ; 1742 1743 while_expr: 1744 T_WHILE T_LPAREN expr T_RPAREN { 1745 while1($3); 1746 clear_warning_flags(); 1747 } 1748 ; 1749 1750 do: 1751 T_DO { 1752 do1(); 1753 } 1754 ; 1755 1756 do_while_expr: 1757 T_WHILE T_LPAREN expr T_RPAREN T_SEMI { 1758 $$ = $3; 1759 } 1760 ; 1761 1762 for_start: 1763 T_FOR T_LPAREN { 1764 begin_declaration_level(AUTO); 1765 block_level++; 1766 } 1767 ; 1768 for_exprs: 1769 for_start declaration_specifiers deftyp notype_init_decls T_SEMI 1770 opt_expr T_SEMI opt_expr T_RPAREN { 1771 /* variable declaration in for loop */ 1772 c99ism(325); 1773 for1(NULL, $6, $8); 1774 clear_warning_flags(); 1775 } 1776 | for_start opt_expr T_SEMI opt_expr T_SEMI opt_expr T_RPAREN { 1777 for1($2, $4, $6); 1778 clear_warning_flags(); 1779 } 1780 ; 1781 1782 opt_expr: 1783 /* empty */ { 1784 $$ = NULL; 1785 } 1786 | expr { 1787 $$ = $1; 1788 } 1789 ; 1790 1791 jump_statement: /* C99 6.8.6 */ 1792 goto identifier T_SEMI { 1793 do_goto(getsym($2)); 1794 } 1795 | goto error T_SEMI { 1796 symtyp = FVFT; 1797 } 1798 | T_CONTINUE T_SEMI { 1799 do_continue(); 1800 } 1801 | T_BREAK T_SEMI { 1802 do_break(); 1803 } 1804 | T_RETURN T_SEMI { 1805 do_return(NULL); 1806 } 1807 | T_RETURN expr T_SEMI { 1808 do_return($2); 1809 } 1810 ; 1811 1812 goto: 1813 T_GOTO { 1814 symtyp = FLABEL; 1815 } 1816 ; 1817 1818 asm_statement: 1819 T_ASM T_LPAREN read_until_rparen T_SEMI { 1820 setasm(); 1821 } 1822 | T_ASM T_QUAL T_LPAREN read_until_rparen T_SEMI { 1823 setasm(); 1824 } 1825 | T_ASM error 1826 ; 1827 1828 read_until_rparen: 1829 /* empty */ { 1830 ignore_up_to_rparen(); 1831 } 1832 ; 1833 1834 declaration_list_opt: 1835 /* empty */ 1836 | declaration_list 1837 ; 1838 1839 declaration_list: 1840 declaration { 1841 clear_warning_flags(); 1842 } 1843 | declaration_list declaration { 1844 clear_warning_flags(); 1845 } 1846 ; 1847 1848 constant_expr_list_opt: 1849 /* empty */ 1850 | constant_expr_list 1851 ; 1852 1853 constant_expr_list: 1854 constant_expr 1855 | constant_expr_list T_COMMA constant_expr 1856 ; 1857 1858 constant_expr: /* C99 6.6 */ 1859 expr %prec T_ASSIGN { 1860 $$ = $1; 1861 } 1862 ; 1863 1864 expr: 1865 expr T_ASTERISK expr { 1866 $$ = build(MULT, $1, $3); 1867 } 1868 | expr T_MULTIPLICATIVE expr { 1869 $$ = build($2, $1, $3); 1870 } 1871 | expr T_ADDITIVE expr { 1872 $$ = build($2, $1, $3); 1873 } 1874 | expr T_SHIFT expr { 1875 $$ = build($2, $1, $3); 1876 } 1877 | expr T_RELATIONAL expr { 1878 $$ = build($2, $1, $3); 1879 } 1880 | expr T_EQUALITY expr { 1881 $$ = build($2, $1, $3); 1882 } 1883 | expr T_AMPER expr { 1884 $$ = build(BITAND, $1, $3); 1885 } 1886 | expr T_BITXOR expr { 1887 $$ = build(BITXOR, $1, $3); 1888 } 1889 | expr T_BITOR expr { 1890 $$ = build(BITOR, $1, $3); 1891 } 1892 | expr T_LOGAND expr { 1893 $$ = build(LOGAND, $1, $3); 1894 } 1895 | expr T_LOGOR expr { 1896 $$ = build(LOGOR, $1, $3); 1897 } 1898 | expr T_QUEST expr T_COLON expr { 1899 $$ = build(QUEST, $1, build(COLON, $3, $5)); 1900 } 1901 | expr T_ASSIGN expr { 1902 $$ = build(ASSIGN, $1, $3); 1903 } 1904 | expr T_OPASSIGN expr { 1905 $$ = build($2, $1, $3); 1906 } 1907 | expr T_COMMA expr { 1908 $$ = build(COMMA, $1, $3); 1909 } 1910 | term { 1911 $$ = $1; 1912 } 1913 | generic_expr { 1914 $$ = $1; 1915 } 1916 ; 1917 1918 term: 1919 T_NAME { 1920 /* XXX really necessary? */ 1921 if (yychar < 0) 1922 yychar = yylex(); 1923 $$ = new_name_node(getsym($1), yychar); 1924 } 1925 | string { 1926 $$ = new_string_node($1); 1927 } 1928 | T_CON { 1929 $$ = expr_new_constant(gettyp($1->v_tspec), $1); 1930 } 1931 | T_LPAREN expr T_RPAREN { 1932 if ($2 != NULL) 1933 $2->tn_parenthesized = true; 1934 $$ = $2; 1935 } 1936 | T_LPAREN compound_statement_lbrace declaration_list_opt 1937 expr_statement_list { 1938 block_level--; 1939 mem_block_level--; 1940 begin_initialization(mktempsym(dup_type($4->tn_type))); 1941 mem_block_level++; 1942 block_level++; 1943 /* ({ }) is a GCC extension */ 1944 gnuism(320); 1945 } compound_statement_rbrace T_RPAREN { 1946 $$ = new_name_node(*current_initsym(), 0); 1947 end_initialization(); 1948 } 1949 | term T_INCDEC { 1950 $$ = build($2 == INC ? INCAFT : DECAFT, $1, NULL); 1951 } 1952 | T_INCDEC term { 1953 $$ = build($1 == INC ? INCBEF : DECBEF, $2, NULL); 1954 } 1955 | T_ASTERISK term { 1956 $$ = build(INDIR, $2, NULL); 1957 } 1958 | T_AMPER term { 1959 $$ = build(ADDR, $2, NULL); 1960 } 1961 | T_UNARY term { 1962 $$ = build($1, $2, NULL); 1963 } 1964 | T_ADDITIVE term { 1965 if (tflag && $1 == PLUS) { 1966 /* unary + is illegal in traditional C */ 1967 warning(100); 1968 } 1969 $$ = build($1 == PLUS ? UPLUS : UMINUS, $2, NULL); 1970 } 1971 | term T_LBRACK expr T_RBRACK { 1972 $$ = build(INDIR, build(PLUS, $1, $3), NULL); 1973 } 1974 | term T_LPAREN T_RPAREN { 1975 $$ = new_function_call_node($1, NULL); 1976 } 1977 | term T_LPAREN func_arg_list T_RPAREN { 1978 $$ = new_function_call_node($1, $3); 1979 } 1980 | term point_or_arrow T_NAME { 1981 if ($1 != NULL) { 1982 sym_t *msym; 1983 /* 1984 * XXX struct_or_union_member should be integrated 1985 * in build() 1986 */ 1987 if ($2 == ARROW) { 1988 /* 1989 * must do this before struct_or_union_member 1990 * is called 1991 */ 1992 $1 = cconv($1); 1993 } 1994 msym = struct_or_union_member($1, $2, getsym($3)); 1995 $$ = build($2, $1, new_name_node(msym, 0)); 1996 } else { 1997 $$ = NULL; 1998 } 1999 } 2000 | T_REAL term { 2001 $$ = build(REAL, $2, NULL); 2002 } 2003 | T_IMAG term { 2004 $$ = build(IMAG, $2, NULL); 2005 } 2006 | T_EXTENSION term { 2007 $$ = $2; 2008 } 2009 | T_REAL T_LPAREN term T_RPAREN { 2010 $$ = build(REAL, $3, NULL); 2011 } 2012 | T_IMAG T_LPAREN term T_RPAREN { 2013 $$ = build(IMAG, $3, NULL); 2014 } 2015 | T_BUILTIN_OFFSETOF T_LPAREN type_name T_COMMA identifier T_RPAREN { 2016 symtyp = FMEMBER; 2017 $$ = build_offsetof($3, getsym($5)); 2018 } 2019 | T_SIZEOF term { 2020 $$ = $2 == NULL ? NULL : build_sizeof($2->tn_type); 2021 if ($$ != NULL) 2022 check_expr_misc($2, false, false, false, false, false, true); 2023 } 2024 | T_SIZEOF T_LPAREN type_name T_RPAREN %prec T_SIZEOF { 2025 $$ = build_sizeof($3); 2026 } 2027 | T_ALIGNOF T_LPAREN type_name T_RPAREN { 2028 $$ = build_alignof($3); 2029 } 2030 | T_LPAREN type_name T_RPAREN term %prec T_UNARY { 2031 $$ = cast($4, $2); 2032 } 2033 | T_LPAREN type_name T_RPAREN { /* C99 6.5.2.5 "Compound literals" */ 2034 sym_t *tmp = mktempsym($2); 2035 begin_initialization(tmp); 2036 cgram_declare(tmp, true, NULL); 2037 } init_lbrace initializer_list comma_opt init_rbrace { 2038 if (!Sflag) 2039 /* compound literals are a C9X/GCC extension */ 2040 gnuism(319); 2041 $$ = new_name_node(*current_initsym(), 0); 2042 end_initialization(); 2043 } 2044 ; 2045 2046 string: 2047 T_STRING { 2048 $$ = $1; 2049 } 2050 | T_STRING string2 { 2051 $$ = cat_strings($1, $2); 2052 } 2053 ; 2054 2055 string2: 2056 T_STRING { 2057 if (tflag) { 2058 /* concatenated strings are illegal in traditional C */ 2059 warning(219); 2060 } 2061 $$ = $1; 2062 } 2063 | string2 T_STRING { 2064 $$ = cat_strings($1, $2); 2065 } 2066 ; 2067 2068 func_arg_list: 2069 expr %prec T_COMMA { 2070 $$ = new_function_argument_node(NULL, $1); 2071 } 2072 | func_arg_list T_COMMA expr { 2073 $$ = new_function_argument_node($1, $3); 2074 } 2075 ; 2076 2077 point_or_arrow: 2078 T_MEMBACC { 2079 symtyp = FMEMBER; 2080 $$ = $1; 2081 } 2082 ; 2083 2084 point: 2085 T_MEMBACC { 2086 if ($1 != POINT) { 2087 /* syntax error '%s' */ 2088 error(249, yytext); 2089 } 2090 } 2091 ; 2092 2093 identifier: /* C99 6.4.2.1 */ 2094 T_NAME { 2095 $$ = $1; 2096 cgram_debug("name '%s'", $$->sb_name); 2097 } 2098 | T_TYPENAME { 2099 $$ = $1; 2100 cgram_debug("typename '%s'", $$->sb_name); 2101 } 2102 ; 2103 2104 comma_opt: 2105 T_COMMA 2106 | /* empty */ 2107 ; 2108 %% 2109 2110 /* ARGSUSED */ 2111 int 2112 yyerror(const char *msg) 2113 { 2114 /* syntax error '%s' */ 2115 error(249, yytext); 2116 if (++sytxerr >= 5) 2117 norecover(); 2118 return 0; 2119 } 2120 2121 static void 2122 cgram_declare(sym_t *decl, bool initflg, sbuf_t *renaming) 2123 { 2124 declare(decl, initflg, renaming); 2125 if (renaming != NULL) 2126 freeyyv(&renaming, T_NAME); 2127 } 2128 2129 /* 2130 * Discard all input tokens up to and including the next 2131 * unmatched right paren 2132 */ 2133 static void 2134 ignore_up_to_rparen(void) 2135 { 2136 int level; 2137 2138 if (yychar < 0) 2139 yychar = yylex(); 2140 freeyyv(&yylval, yychar); 2141 2142 level = 1; 2143 while (yychar != T_RPAREN || --level > 0) { 2144 if (yychar == T_LPAREN) { 2145 level++; 2146 } else if (yychar <= 0) { 2147 break; 2148 } 2149 freeyyv(&yylval, yychar = yylex()); 2150 } 2151 2152 yyclearin; 2153 } 2154 2155 static sym_t * 2156 symbolrename(sym_t *s, sbuf_t *sb) 2157 { 2158 if (sb != NULL) 2159 s->s_rename = sb->sb_name; 2160 return s; 2161 } 2162
Indexes created Thu Oct 02 14:10:14 GMT 2025