cgram.y revision 1.220
1 %{ 2 /* $NetBSD: cgram.y,v 1.220 2021/04/20 21:48:39 christos 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 1.220 2021/04/20 21:48:39 christos 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 177 127 128 %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_NORETURN 239 %token <y_type> T_AT_NOTHROW 240 %token <y_type> T_AT_NO_INSTRUMENT_FUNCTION 241 %token <y_type> T_AT_OPTIMIZE 242 %token <y_type> T_AT_PACKED 243 %token <y_type> T_AT_PCS 244 %token <y_type> T_AT_PURE 245 %token <y_type> T_AT_RETURNS_TWICE 246 %token <y_type> T_AT_SECTION 247 %token <y_type> T_AT_SENTINEL 248 %token <y_type> T_AT_STRING 249 %token <y_type> T_AT_TLS_MODEL 250 %token <y_type> T_AT_TUNION 251 %token <y_type> T_AT_UNUSED 252 %token <y_type> T_AT_USED 253 %token <y_type> T_AT_VISIBILITY 254 %token <y_type> T_AT_WARN_UNUSED_RESULT 255 %token <y_type> T_AT_WEAK 256 257 %left T_COMMA 258 %right T_ASSIGN T_OPASSIGN 259 %right T_QUEST T_COLON 260 %left T_LOGOR 261 %left T_LOGAND 262 %left T_BITOR 263 %left T_BITXOR 264 %left T_AMPER 265 %left T_EQUALITY 266 %left T_RELATIONAL 267 %left T_SHIFT 268 %left T_ADDITIVE 269 %left T_ASTERISK T_MULTIPLICATIVE 270 %right T_UNARY T_INCDEC T_SIZEOF T_REAL T_IMAG 271 %left T_LPAREN T_LBRACK T_MEMBACC 272 273 %token <y_sb> T_NAME 274 %token <y_sb> T_TYPENAME 275 %token <y_val> T_CON 276 %token <y_string> T_STRING 277 278 %type <y_sym> func_decl 279 %type <y_sym> notype_decl 280 %type <y_sym> type_decl 281 %type <y_type> typespec 282 %type <y_type> clrtyp_typespec 283 %type <y_type> notype_typespec 284 %type <y_type> struct_spec 285 %type <y_type> enum_spec 286 %type <y_type> type_attribute 287 %type <y_sym> struct_tag 288 %type <y_sym> enum_tag 289 %type <y_tspec> struct 290 %type <y_sym> struct_declaration 291 %type <y_sb> identifier 292 %type <y_sym> member_declaration_list_with_rbrace 293 %type <y_sym> member_declaration_list 294 %type <y_sym> member_declaration 295 %type <y_sym> notype_member_decls 296 %type <y_sym> type_member_decls 297 %type <y_sym> notype_member_decl 298 %type <y_sym> type_member_decl 299 %type <y_tnode> constant_expr 300 %type <y_tnode> array_size 301 %type <y_sym> enum_declaration 302 %type <y_sym> enums_with_opt_comma 303 %type <y_sym> enums 304 %type <y_sym> enumerator 305 %type <y_sym> enumeration_constant 306 %type <y_sym> notype_direct_decl 307 %type <y_sym> type_direct_decl 308 %type <y_pqinf> pointer 309 %type <y_pqinf> asterisk 310 %type <y_sym> param_decl 311 %type <y_sym> param_list 312 %type <y_sym> abstract_decl_param_list 313 %type <y_sym> direct_param_decl 314 %type <y_sym> notype_param_decl 315 %type <y_sym> direct_notype_param_decl 316 %type <y_pqinf> type_qualifier_list 317 %type <y_pqinf> type_qualifier 318 %type <y_sym> identifier_list 319 %type <y_sym> abstract_decl 320 %type <y_sym> direct_abstract_decl 321 %type <y_sym> vararg_parameter_type_list 322 %type <y_sym> parameter_type_list 323 %type <y_sym> parameter_declaration 324 %type <y_tnode> expr 325 %type <y_tnode> expr_statement_val 326 %type <y_tnode> expr_statement_list 327 %type <y_tnode> term 328 %type <y_tnode> generic_expr 329 %type <y_tnode> func_arg_list 330 %type <y_op> point_or_arrow 331 %type <y_type> type_name 332 %type <y_sym> abstract_declaration 333 %type <y_tnode> do_while_expr 334 %type <y_tnode> opt_expr 335 %type <y_string> string 336 %type <y_string> string2 337 %type <y_sb> opt_asm_or_symbolrename 338 %type <y_range> range 339 %type <y_seen_statement> block_item_list 340 %type <y_seen_statement> block_item 341 342 343 %% 344 345 program: 346 /* empty */ { 347 if (sflag) { 348 /* empty translation unit */ 349 error(272); 350 } else if (!tflag) { 351 /* empty translation unit */ 352 warning(272); 353 } 354 } 355 | translation_unit 356 ; 357 358 translation_unit: /* C99 6.9 */ 359 external_declaration 360 | translation_unit external_declaration 361 ; 362 363 external_declaration: /* C99 6.9 */ 364 asm_statement 365 | function_definition { 366 global_clean_up_decl(false); 367 clear_warning_flags(); 368 } 369 | top_level_declaration { 370 global_clean_up_decl(false); 371 clear_warning_flags(); 372 } 373 ; 374 375 /* 376 * On the top level, lint allows several forms of declarations that it doesn't 377 * allow in functions. For example, a single ';' is an empty declaration and 378 * is supported by some compilers, but in a function it would be an empty 379 * statement, not a declaration. This makes a difference in C90 mode, where 380 * a statement must not be followed by a declaration. 381 * 382 * See 'declaration' for all other declarations. 383 */ 384 top_level_declaration: /* C99 6.9 calls this 'declaration' */ 385 T_SEMI { 386 if (sflag) { 387 /* empty declaration */ 388 error(0); 389 } else if (!tflag) { 390 /* empty declaration */ 391 warning(0); 392 } 393 } 394 | clrtyp deftyp notype_init_decls T_SEMI { 395 if (sflag) { 396 /* old style declaration; add 'int' */ 397 error(1); 398 } else if (!tflag) { 399 /* old style declaration; add 'int' */ 400 warning(1); 401 } 402 } 403 | declmods deftyp T_SEMI { 404 if (dcs->d_scl == TYPEDEF) { 405 /* typedef declares no type name */ 406 warning(72); 407 } else { 408 /* empty declaration */ 409 warning(2); 410 } 411 } 412 | declmods deftyp notype_init_decls T_SEMI 413 | declaration_specifiers deftyp T_SEMI { 414 if (dcs->d_scl == TYPEDEF) { 415 /* typedef declares no type name */ 416 warning(72); 417 } else if (!dcs->d_nonempty_decl) { 418 /* empty declaration */ 419 warning(2); 420 } 421 } 422 | declaration_specifiers deftyp type_init_decls T_SEMI 423 | error T_SEMI { 424 global_clean_up(); 425 } 426 | error T_RBRACE { 427 global_clean_up(); 428 } 429 ; 430 431 function_definition: /* C99 6.9.1 */ 432 func_decl { 433 if ($1->s_type->t_tspec != FUNC) { 434 /* syntax error '%s' */ 435 error(249, yytext); 436 YYERROR; 437 } 438 if ($1->s_type->t_typedef) { 439 /* ()-less function definition */ 440 error(64); 441 YYERROR; 442 } 443 funcdef($1); 444 block_level++; 445 begin_declaration_level(ARG); 446 if (lwarn == LWARN_NONE) 447 $1->s_used = true; 448 } arg_declaration_list_opt { 449 end_declaration_level(); 450 block_level--; 451 check_func_lint_directives(); 452 check_func_old_style_arguments(); 453 begin_control_statement(CS_FUNCTION_BODY); 454 } compound_statement { 455 funcend(); 456 end_control_statement(CS_FUNCTION_BODY); 457 } 458 ; 459 460 func_decl: 461 clrtyp deftyp notype_decl { 462 $$ = $3; 463 } 464 | declmods deftyp notype_decl { 465 $$ = $3; 466 } 467 | declaration_specifiers deftyp type_decl { 468 $$ = $3; 469 } 470 ; 471 472 arg_declaration_list_opt: /* C99 6.9.1p13 example 1 */ 473 /* empty */ 474 | arg_declaration_list 475 ; 476 477 arg_declaration_list: /* C99 6.9.1p13 example 1 */ 478 arg_declaration 479 | arg_declaration_list arg_declaration 480 /* XXX or better "arg_declaration error" ? */ 481 | error 482 ; 483 484 /* 485 * "arg_declaration" is separated from "declaration" because it 486 * needs other error handling. 487 */ 488 arg_declaration: 489 declmods deftyp T_SEMI { 490 /* empty declaration */ 491 warning(2); 492 } 493 | declmods deftyp notype_init_decls T_SEMI 494 | declaration_specifiers deftyp T_SEMI { 495 if (!dcs->d_nonempty_decl) { 496 /* empty declaration */ 497 warning(2); 498 } else { 499 /* '%s' declared in argument declaration list */ 500 warning(3, type_name(dcs->d_type)); 501 } 502 } 503 | declaration_specifiers deftyp type_init_decls T_SEMI { 504 if (dcs->d_nonempty_decl) { 505 /* '%s' declared in argument declaration list */ 506 warning(3, type_name(dcs->d_type)); 507 } 508 } 509 | declmods error 510 | declaration_specifiers error 511 ; 512 513 declaration: /* C99 6.7 */ 514 declmods deftyp T_SEMI { 515 if (dcs->d_scl == TYPEDEF) { 516 /* typedef declares no type name */ 517 warning(72); 518 } else { 519 /* empty declaration */ 520 warning(2); 521 } 522 } 523 | declmods deftyp notype_init_decls T_SEMI 524 | declaration_specifiers deftyp T_SEMI { 525 if (dcs->d_scl == TYPEDEF) { 526 /* typedef declares no type name */ 527 warning(72); 528 } else if (!dcs->d_nonempty_decl) { 529 /* empty declaration */ 530 warning(2); 531 } 532 } 533 | declaration_specifiers deftyp type_init_decls T_SEMI 534 | error T_SEMI 535 ; 536 537 type_attribute_format_type: 538 T_AT_FORMAT_GNU_PRINTF 539 | T_AT_FORMAT_PRINTF 540 | T_AT_FORMAT_SCANF 541 | T_AT_FORMAT_STRFMON 542 | T_AT_FORMAT_STRFTIME 543 | T_AT_FORMAT_SYSLOG 544 ; 545 546 type_attribute_bounded_type: 547 T_AT_MINBYTES 548 | T_AT_STRING 549 | T_AT_BUFFER 550 ; 551 552 553 type_attribute_spec: 554 /* empty */ 555 | T_AT_DEPRECATED T_LPAREN string T_RPAREN 556 | T_AT_DEPRECATED 557 | T_AT_ALIGNED T_LPAREN constant_expr T_RPAREN 558 | T_AT_ALLOC_SIZE T_LPAREN constant_expr T_COMMA constant_expr T_RPAREN 559 | T_AT_ALLOC_SIZE T_LPAREN constant_expr T_RPAREN 560 | T_AT_BOUNDED T_LPAREN type_attribute_bounded_type 561 T_COMMA constant_expr T_COMMA constant_expr T_RPAREN 562 | T_AT_SENTINEL T_LPAREN constant_expr T_RPAREN 563 | T_AT_SENTINEL 564 | T_AT_FORMAT_ARG T_LPAREN constant_expr T_RPAREN 565 | T_AT_NONNULL T_LPAREN constant_expr T_RPAREN 566 | T_AT_MODE T_LPAREN T_NAME T_RPAREN 567 | T_AT_ALIAS T_LPAREN string T_RPAREN 568 | T_AT_OPTIMIZE T_LPAREN string T_RPAREN 569 | T_AT_PCS T_LPAREN string T_RPAREN 570 | T_AT_SECTION T_LPAREN string T_RPAREN 571 | T_AT_TLS_MODEL T_LPAREN string T_RPAREN 572 | T_AT_ALIGNED 573 | T_AT_CONSTRUCTOR 574 | T_AT_DESTRUCTOR 575 | T_AT_MALLOC 576 | T_AT_MAY_ALIAS 577 | T_AT_NO_INSTRUMENT_FUNCTION 578 | T_AT_NOINLINE 579 | T_AT_NORETURN 580 | T_AT_NOTHROW 581 | T_AT_COLD 582 | T_AT_COMMON 583 | T_AT_RETURNS_TWICE 584 | T_AT_PACKED { 585 addpacked(); 586 } 587 | T_AT_PURE 588 | T_AT_TUNION 589 | T_AT_GNU_INLINE 590 | T_AT_ALWAYS_INLINE 591 | T_AT_FORMAT T_LPAREN type_attribute_format_type T_COMMA 592 constant_expr T_COMMA constant_expr T_RPAREN 593 | T_AT_USED { 594 add_attr_used(); 595 } 596 | T_AT_UNUSED { 597 add_attr_used(); 598 } 599 | T_AT_WARN_UNUSED_RESULT 600 | T_AT_WEAK 601 | T_AT_VISIBILITY T_LPAREN constant_expr T_RPAREN 602 | T_AT_FALLTHROUGH { 603 fallthru(1); 604 } 605 | T_QUAL { 606 if ($1 != CONST) 607 yyerror("Bad attribute"); 608 } 609 ; 610 611 type_attribute_spec_list: 612 type_attribute_spec 613 | type_attribute_spec_list T_COMMA type_attribute_spec 614 ; 615 616 align_as: 617 typespec 618 | constant_expr 619 ; 620 621 type_attribute: 622 T_ATTRIBUTE T_LPAREN T_LPAREN { 623 attron = true; 624 } type_attribute_spec_list { 625 attron = false; 626 } T_RPAREN T_RPAREN 627 | T_ALIGNAS T_LPAREN align_as T_RPAREN { 628 } 629 | T_PACKED { 630 addpacked(); 631 } 632 | T_NORETURN { 633 } 634 ; 635 636 type_attribute_list: 637 type_attribute 638 | type_attribute_list type_attribute 639 ; 640 641 clrtyp: 642 /* empty */ { 643 clrtyp(); 644 } 645 ; 646 647 deftyp: 648 /* empty */ { 649 deftyp(); 650 } 651 ; 652 653 declaration_specifiers: /* C99 6.7 */ 654 clrtyp_typespec { 655 add_type($1); 656 } 657 | declmods typespec { 658 add_type($2); 659 } 660 | type_attribute declaration_specifiers 661 | declaration_specifiers declmod 662 | declaration_specifiers notype_typespec { 663 add_type($2); 664 } 665 ; 666 667 declmods: 668 clrtyp T_QUAL { 669 add_qualifier($2); 670 } 671 | clrtyp T_SCLASS { 672 add_storage_class($2); 673 } 674 | declmods declmod 675 ; 676 677 declmod: 678 T_QUAL { 679 add_qualifier($1); 680 } 681 | T_SCLASS { 682 add_storage_class($1); 683 } 684 | type_attribute_list 685 ; 686 687 clrtyp_typespec: 688 clrtyp notype_typespec { 689 $$ = $2; 690 } 691 | T_TYPENAME clrtyp { 692 $$ = getsym($1)->s_type; 693 } 694 ; 695 696 typespec: 697 notype_typespec { 698 $$ = $1; 699 } 700 | T_TYPENAME { 701 $$ = getsym($1)->s_type; 702 } 703 ; 704 705 notype_typespec: 706 T_TYPE { 707 $$ = gettyp($1); 708 } 709 | T_TYPEOF term { 710 $$ = $2->tn_type; 711 } 712 | struct_spec { 713 end_declaration_level(); 714 $$ = $1; 715 } 716 | enum_spec { 717 end_declaration_level(); 718 $$ = $1; 719 } 720 ; 721 722 struct_spec: 723 struct struct_tag { 724 /* 725 * STDC requires that "struct a;" always introduces 726 * a new tag if "a" is not declared at current level 727 * 728 * yychar is valid because otherwise the parser would not 729 * have been able to decide if it must shift or reduce 730 */ 731 $$ = mktag($2, $1, false, yychar == T_SEMI); 732 } 733 | struct struct_tag { 734 dcs->d_tagtyp = mktag($2, $1, true, false); 735 } struct_declaration { 736 $$ = complete_tag_struct_or_union(dcs->d_tagtyp, $4); 737 } 738 | struct { 739 dcs->d_tagtyp = mktag(NULL, $1, true, false); 740 } struct_declaration { 741 $$ = complete_tag_struct_or_union(dcs->d_tagtyp, $3); 742 } 743 | struct error { 744 symtyp = FVFT; 745 $$ = gettyp(INT); 746 } 747 ; 748 749 struct: 750 struct type_attribute 751 | T_STRUCT_OR_UNION { 752 symtyp = FTAG; 753 begin_declaration_level($1 == STRUCT ? MOS : MOU); 754 dcs->d_offset = 0; 755 dcs->d_stralign = CHAR_SIZE; 756 $$ = $1; 757 } 758 ; 759 760 struct_tag: 761 identifier { 762 $$ = getsym($1); 763 } 764 ; 765 766 struct_declaration: 767 struct_decl_lbrace member_declaration_list_with_rbrace { 768 $$ = $2; 769 } 770 ; 771 772 struct_decl_lbrace: 773 T_LBRACE { 774 symtyp = FVFT; 775 } 776 ; 777 778 member_declaration_list_with_rbrace: 779 member_declaration_list T_SEMI T_RBRACE { 780 $$ = $1; 781 } 782 | member_declaration_list T_RBRACE { 783 if (sflag) { 784 /* syntax req. ';' after last struct/union member */ 785 error(66); 786 } else { 787 /* syntax req. ';' after last struct/union member */ 788 warning(66); 789 } 790 $$ = $1; 791 } 792 | T_RBRACE { 793 $$ = NULL; 794 } 795 ; 796 797 opt_type_attribute: 798 /* empty */ 799 | type_attribute 800 ; 801 802 member_declaration_list: 803 member_declaration { 804 $$ = $1; 805 } 806 | member_declaration_list T_SEMI member_declaration { 807 $$ = lnklst($1, $3); 808 } 809 ; 810 811 member_declaration: 812 noclass_declmods deftyp { 813 /* too late, i know, but getsym() compensates it */ 814 symtyp = FMEMBER; 815 } notype_member_decls opt_type_attribute { 816 symtyp = FVFT; 817 $$ = $4; 818 } 819 | noclass_declspecs deftyp { 820 symtyp = FMEMBER; 821 } type_member_decls opt_type_attribute { 822 symtyp = FVFT; 823 $$ = $4; 824 } 825 | noclass_declmods deftyp opt_type_attribute { 826 symtyp = FVFT; 827 /* struct or union member must be named */ 828 if (!Sflag) 829 /* anonymous struct/union members is a C9X feature */ 830 warning(49); 831 /* add all the members of the anonymous struct/union */ 832 $$ = dcs->d_type->t_str->sou_first_member; 833 anonymize($$); 834 } 835 | noclass_declspecs deftyp opt_type_attribute { 836 symtyp = FVFT; 837 /* struct or union member must be named */ 838 if (!Sflag) 839 /* anonymous struct/union members is a C9X feature */ 840 warning(49); 841 $$ = dcs->d_type->t_str->sou_first_member; 842 /* add all the members of the anonymous struct/union */ 843 anonymize($$); 844 } 845 | error { 846 symtyp = FVFT; 847 $$ = NULL; 848 } 849 ; 850 851 noclass_declspecs: 852 clrtyp_typespec { 853 add_type($1); 854 } 855 | type_attribute noclass_declspecs 856 | noclass_declmods typespec { 857 add_type($2); 858 } 859 | noclass_declspecs T_QUAL { 860 add_qualifier($2); 861 } 862 | noclass_declspecs notype_typespec { 863 add_type($2); 864 } 865 | noclass_declspecs type_attribute 866 ; 867 868 noclass_declmods: 869 clrtyp T_QUAL { 870 add_qualifier($2); 871 } 872 | noclass_declmods T_QUAL { 873 add_qualifier($2); 874 } 875 ; 876 877 notype_member_decls: 878 notype_member_decl { 879 $$ = declarator_1_struct_union($1); 880 } 881 | notype_member_decls { 882 symtyp = FMEMBER; 883 } T_COMMA type_member_decl { 884 $$ = lnklst($1, declarator_1_struct_union($4)); 885 } 886 ; 887 888 type_member_decls: 889 type_member_decl { 890 $$ = declarator_1_struct_union($1); 891 } 892 | type_member_decls { 893 symtyp = FMEMBER; 894 } T_COMMA type_member_decl { 895 $$ = lnklst($1, declarator_1_struct_union($4)); 896 } 897 ; 898 899 notype_member_decl: 900 notype_decl { 901 $$ = $1; 902 } 903 | notype_decl T_COLON constant_expr { /* C99 6.7.2.1 */ 904 $$ = bitfield($1, to_int_constant($3, true)); 905 } 906 | { 907 symtyp = FVFT; 908 } T_COLON constant_expr { /* C99 6.7.2.1 */ 909 $$ = bitfield(NULL, to_int_constant($3, true)); 910 } 911 ; 912 913 type_member_decl: 914 type_decl { 915 $$ = $1; 916 } 917 | type_decl T_COLON constant_expr { 918 $$ = bitfield($1, to_int_constant($3, true)); 919 } 920 | { 921 symtyp = FVFT; 922 } T_COLON constant_expr { 923 $$ = bitfield(NULL, to_int_constant($3, true)); 924 } 925 ; 926 927 enum_spec: 928 enum enum_tag { 929 $$ = mktag($2, ENUM, false, false); 930 } 931 | enum enum_tag { 932 dcs->d_tagtyp = mktag($2, ENUM, true, false); 933 } enum_declaration { 934 $$ = complete_tag_enum(dcs->d_tagtyp, $4); 935 } 936 | enum { 937 dcs->d_tagtyp = mktag(NULL, ENUM, true, false); 938 } enum_declaration { 939 $$ = complete_tag_enum(dcs->d_tagtyp, $3); 940 } 941 | enum error { 942 symtyp = FVFT; 943 $$ = gettyp(INT); 944 } 945 ; 946 947 enum: 948 T_ENUM { 949 symtyp = FTAG; 950 begin_declaration_level(CTCONST); 951 } 952 ; 953 954 enum_tag: 955 identifier { 956 $$ = getsym($1); 957 } 958 ; 959 960 enum_declaration: 961 enum_decl_lbrace enums_with_opt_comma T_RBRACE { 962 $$ = $2; 963 } 964 ; 965 966 enum_decl_lbrace: 967 T_LBRACE { 968 symtyp = FVFT; 969 enumval = 0; 970 } 971 ; 972 973 enums_with_opt_comma: 974 enums { 975 $$ = $1; 976 } 977 | enums T_COMMA { 978 if (sflag) { 979 /* trailing ',' prohibited in enum declaration */ 980 error(54); 981 } else { 982 /* trailing ',' prohibited in enum declaration */ 983 c99ism(54); 984 } 985 $$ = $1; 986 } 987 ; 988 989 enums: 990 enumerator { 991 $$ = $1; 992 } 993 | enums T_COMMA enumerator { 994 $$ = lnklst($1, $3); 995 } 996 | error { 997 $$ = NULL; 998 } 999 ; 1000 1001 enumerator: 1002 enumeration_constant { 1003 $$ = enumeration_constant($1, enumval, true); 1004 } 1005 | enumeration_constant T_ASSIGN constant_expr { 1006 $$ = enumeration_constant($1, to_int_constant($3, true), false); 1007 } 1008 ; 1009 1010 enumeration_constant: /* C99 6.4.4.3 */ 1011 identifier { 1012 $$ = getsym($1); 1013 } 1014 ; 1015 1016 1017 notype_init_decls: 1018 notype_init_decl 1019 | notype_init_decls T_COMMA type_init_decl 1020 ; 1021 1022 type_init_decls: 1023 type_init_decl 1024 | type_init_decls T_COMMA type_init_decl 1025 ; 1026 1027 notype_init_decl: 1028 notype_decl opt_asm_or_symbolrename { 1029 cgram_declare($1, false, $2); 1030 check_size($1); 1031 } 1032 | notype_decl opt_asm_or_symbolrename { 1033 begin_initialization($1); 1034 cgram_declare($1, true, $2); 1035 } T_ASSIGN initializer { 1036 check_size($1); 1037 end_initialization(); 1038 } 1039 ; 1040 1041 type_init_decl: 1042 type_decl opt_asm_or_symbolrename { 1043 cgram_declare($1, false, $2); 1044 check_size($1); 1045 } 1046 | type_decl opt_asm_or_symbolrename { 1047 begin_initialization($1); 1048 cgram_declare($1, true, $2); 1049 } T_ASSIGN initializer { 1050 check_size($1); 1051 end_initialization(); 1052 } 1053 ; 1054 1055 notype_decl: 1056 notype_direct_decl { 1057 $$ = $1; 1058 } 1059 | pointer notype_direct_decl { 1060 $$ = add_pointer($2, $1); 1061 } 1062 ; 1063 1064 notype_direct_decl: 1065 T_NAME { 1066 $$ = declarator_name(getsym($1)); 1067 } 1068 | T_LPAREN type_decl T_RPAREN { 1069 $$ = $2; 1070 } 1071 | type_attribute notype_direct_decl { 1072 $$ = $2; 1073 } 1074 | notype_direct_decl T_LBRACK T_RBRACK { 1075 $$ = add_array($1, false, 0); 1076 } 1077 | notype_direct_decl T_LBRACK array_size T_RBRACK { 1078 $$ = add_array($1, true, to_int_constant($3, false)); 1079 } 1080 | notype_direct_decl param_list opt_asm_or_symbolrename { 1081 $$ = add_function(symbolrename($1, $3), $2); 1082 end_declaration_level(); 1083 block_level--; 1084 } 1085 | notype_direct_decl type_attribute_list 1086 ; 1087 1088 type_decl: 1089 type_direct_decl { 1090 $$ = $1; 1091 } 1092 | pointer type_direct_decl { 1093 $$ = add_pointer($2, $1); 1094 } 1095 ; 1096 1097 type_direct_decl: 1098 identifier { 1099 $$ = declarator_name(getsym($1)); 1100 } 1101 | T_LPAREN type_decl T_RPAREN { 1102 $$ = $2; 1103 } 1104 | type_attribute type_direct_decl { 1105 $$ = $2; 1106 } 1107 | type_direct_decl T_LBRACK T_RBRACK { 1108 $$ = add_array($1, false, 0); 1109 } 1110 | type_direct_decl T_LBRACK array_size T_RBRACK { 1111 $$ = add_array($1, true, to_int_constant($3, false)); 1112 } 1113 | type_direct_decl param_list opt_asm_or_symbolrename { 1114 $$ = add_function(symbolrename($1, $3), $2); 1115 end_declaration_level(); 1116 block_level--; 1117 } 1118 | type_direct_decl type_attribute_list 1119 ; 1120 1121 /* 1122 * param_decl and notype_param_decl exist to avoid a conflict in 1123 * argument lists. A typename enclosed in parens should always be 1124 * treated as a typename, not an argument. 1125 * "typedef int a; f(int (a));" is "typedef int a; f(int foo(a));" 1126 * not "typedef int a; f(int a);" 1127 */ 1128 param_decl: 1129 direct_param_decl { 1130 $$ = $1; 1131 } 1132 | pointer direct_param_decl { 1133 $$ = add_pointer($2, $1); 1134 } 1135 ; 1136 1137 opt_type_qualifier_list: 1138 /* empty */ 1139 | type_qualifier_list 1140 ; 1141 1142 array_size: 1143 opt_type_qualifier_list T_SCLASS constant_expr { 1144 /* C11 6.7.6.3p7 */ 1145 if ($2 != STATIC) 1146 yyerror("Bad attribute"); 1147 /* static array size is a C11 extension */ 1148 c11ism(343); 1149 $$ = $3; 1150 } 1151 | constant_expr { 1152 $$ = $1; 1153 } 1154 ; 1155 1156 direct_param_decl: 1157 identifier type_attribute_list { 1158 $$ = declarator_name(getsym($1)); 1159 } 1160 | identifier { 1161 $$ = declarator_name(getsym($1)); 1162 } 1163 | T_LPAREN notype_param_decl T_RPAREN { 1164 $$ = $2; 1165 } 1166 | direct_param_decl T_LBRACK T_RBRACK { 1167 $$ = add_array($1, false, 0); 1168 } 1169 | direct_param_decl T_LBRACK array_size T_RBRACK { 1170 $$ = add_array($1, true, to_int_constant($3, false)); 1171 } 1172 | direct_param_decl param_list opt_asm_or_symbolrename { 1173 $$ = add_function(symbolrename($1, $3), $2); 1174 end_declaration_level(); 1175 block_level--; 1176 } 1177 ; 1178 1179 notype_param_decl: 1180 direct_notype_param_decl { 1181 $$ = $1; 1182 } 1183 | pointer direct_notype_param_decl { 1184 $$ = add_pointer($2, $1); 1185 } 1186 ; 1187 1188 direct_notype_param_decl: 1189 identifier { 1190 $$ = declarator_name(getsym($1)); 1191 } 1192 | T_LPAREN notype_param_decl T_RPAREN { 1193 $$ = $2; 1194 } 1195 | direct_notype_param_decl T_LBRACK T_RBRACK { 1196 $$ = add_array($1, false, 0); 1197 } 1198 | direct_notype_param_decl T_LBRACK array_size T_RBRACK { 1199 $$ = add_array($1, true, to_int_constant($3, false)); 1200 } 1201 | direct_notype_param_decl param_list opt_asm_or_symbolrename { 1202 $$ = add_function(symbolrename($1, $3), $2); 1203 end_declaration_level(); 1204 block_level--; 1205 } 1206 ; 1207 1208 pointer: 1209 asterisk { 1210 $$ = $1; 1211 } 1212 | asterisk type_qualifier_list { 1213 $$ = merge_pointers_and_qualifiers($1, $2); 1214 } 1215 | asterisk pointer { 1216 $$ = merge_pointers_and_qualifiers($1, $2); 1217 } 1218 | asterisk type_qualifier_list pointer { 1219 $$ = merge_pointers_and_qualifiers($1, $2); 1220 $$ = merge_pointers_and_qualifiers($$, $3); 1221 } 1222 ; 1223 1224 asterisk: 1225 T_ASTERISK { 1226 $$ = xcalloc(1, sizeof(*$$)); 1227 $$->p_pcnt = 1; 1228 } 1229 ; 1230 1231 type_qualifier_list: 1232 type_qualifier { 1233 $$ = $1; 1234 } 1235 | type_qualifier_list type_qualifier { 1236 $$ = merge_pointers_and_qualifiers($1, $2); 1237 } 1238 ; 1239 1240 type_qualifier: 1241 T_QUAL { 1242 $$ = xcalloc(1, sizeof(*$$)); 1243 if ($1 == CONST) { 1244 $$->p_const = true; 1245 } else if ($1 == VOLATILE) { 1246 $$->p_volatile = true; 1247 } else { 1248 lint_assert($1 == RESTRICT || $1 == THREAD); 1249 } 1250 } 1251 ; 1252 1253 param_list: 1254 id_list_lparen identifier_list T_RPAREN { 1255 $$ = $2; 1256 } 1257 | abstract_decl_param_list { 1258 $$ = $1; 1259 } 1260 ; 1261 1262 id_list_lparen: 1263 T_LPAREN { 1264 block_level++; 1265 begin_declaration_level(PROTO_ARG); 1266 } 1267 ; 1268 1269 identifier_list: 1270 T_NAME { 1271 $$ = old_style_function_name(getsym($1)); 1272 } 1273 | identifier_list T_COMMA T_NAME { 1274 $$ = lnklst($1, old_style_function_name(getsym($3))); 1275 } 1276 | identifier_list error { 1277 $$ = $1; 1278 } 1279 ; 1280 1281 abstract_decl_param_list: 1282 abstract_decl_lparen T_RPAREN opt_type_attribute { 1283 $$ = NULL; 1284 } 1285 | abstract_decl_lparen vararg_parameter_type_list T_RPAREN opt_type_attribute { 1286 dcs->d_proto = true; 1287 $$ = $2; 1288 } 1289 | abstract_decl_lparen error T_RPAREN opt_type_attribute { 1290 $$ = NULL; 1291 } 1292 ; 1293 1294 abstract_decl_lparen: 1295 T_LPAREN { 1296 block_level++; 1297 begin_declaration_level(PROTO_ARG); 1298 } 1299 ; 1300 1301 vararg_parameter_type_list: 1302 parameter_type_list { 1303 $$ = $1; 1304 } 1305 | parameter_type_list T_COMMA T_ELLIPSIS { 1306 dcs->d_vararg = true; 1307 $$ = $1; 1308 } 1309 | T_ELLIPSIS { 1310 if (sflag) { 1311 /* ANSI C requires formal parameter before '...' */ 1312 error(84); 1313 } else if (!tflag) { 1314 /* ANSI C requires formal parameter before '...' */ 1315 warning(84); 1316 } 1317 dcs->d_vararg = true; 1318 $$ = NULL; 1319 } 1320 ; 1321 1322 parameter_type_list: 1323 parameter_declaration { 1324 $$ = $1; 1325 } 1326 | parameter_type_list T_COMMA parameter_declaration { 1327 $$ = lnklst($1, $3); 1328 } 1329 ; 1330 1331 parameter_declaration: 1332 declmods deftyp { 1333 $$ = declare_argument(abstract_name(), false); 1334 } 1335 | declaration_specifiers deftyp { 1336 $$ = declare_argument(abstract_name(), false); 1337 } 1338 | declmods deftyp notype_param_decl { 1339 $$ = declare_argument($3, false); 1340 } 1341 /* 1342 * param_decl is needed because of following conflict: 1343 * "typedef int a; f(int (a));" could be parsed as 1344 * "function with argument a of type int", or 1345 * "function with an abstract argument of type function". 1346 * This grammar realizes the second case. 1347 */ 1348 | declaration_specifiers deftyp param_decl { 1349 $$ = declare_argument($3, false); 1350 } 1351 | declmods deftyp abstract_decl { 1352 $$ = declare_argument($3, false); 1353 } 1354 | declaration_specifiers deftyp abstract_decl { 1355 $$ = declare_argument($3, false); 1356 } 1357 ; 1358 1359 opt_asm_or_symbolrename: /* expect only one */ 1360 /* empty */ { 1361 $$ = NULL; 1362 } 1363 | T_ASM T_LPAREN T_STRING T_RPAREN { 1364 freeyyv(&$3, T_STRING); 1365 $$ = NULL; 1366 } 1367 | T_SYMBOLRENAME T_LPAREN T_NAME T_RPAREN { 1368 $$ = $3; 1369 } 1370 ; 1371 1372 initializer: /* C99 6.7.8 "Initialization" */ 1373 expr %prec T_COMMA { 1374 init_expr($1); 1375 } 1376 | init_lbrace init_rbrace { 1377 /* XXX: Empty braces are not covered by C99 6.7.8. */ 1378 } 1379 | init_lbrace initializer_list comma_opt init_rbrace 1380 | error 1381 ; 1382 1383 initializer_list: /* C99 6.7.8 "Initialization" */ 1384 initializer_list_item 1385 | initializer_list T_COMMA initializer_list_item 1386 ; 1387 1388 initializer_list_item: 1389 designation initializer 1390 | initializer 1391 ; 1392 1393 range: 1394 constant_expr { 1395 $$.lo = to_int_constant($1, true); 1396 $$.hi = $$.lo; 1397 } 1398 | constant_expr T_ELLIPSIS constant_expr { 1399 $$.lo = to_int_constant($1, true); 1400 $$.hi = to_int_constant($3, true); 1401 /* initialization with '[a...b]' is a GNU extension */ 1402 gnuism(340); 1403 } 1404 ; 1405 1406 designator: /* C99 6.7.8 "Initialization" */ 1407 T_LBRACK range T_RBRACK { 1408 add_designator_subscript($2); 1409 if (!Sflag) 1410 /* array initializer with des.s is a C9X feature */ 1411 warning(321); 1412 } 1413 | point identifier { 1414 if (!Sflag) 1415 /* struct or union member name in initializer is ... */ 1416 warning(313); 1417 add_designator_member($2); 1418 } 1419 ; 1420 1421 designator_list: /* C99 6.7.8 "Initialization" */ 1422 designator 1423 | designator_list designator 1424 ; 1425 1426 designation: /* C99 6.7.8 "Initialization" */ 1427 designator_list T_ASSIGN 1428 | identifier T_COLON { 1429 /* GCC style struct or union member name in initializer */ 1430 gnuism(315); 1431 add_designator_member($1); 1432 } 1433 ; 1434 1435 init_lbrace: 1436 T_LBRACE { 1437 init_lbrace(); 1438 } 1439 ; 1440 1441 init_rbrace: 1442 T_RBRACE { 1443 init_rbrace(); 1444 } 1445 ; 1446 1447 type_name: 1448 { 1449 begin_declaration_level(ABSTRACT); 1450 } abstract_declaration { 1451 end_declaration_level(); 1452 $$ = $2->s_type; 1453 } 1454 ; 1455 1456 abstract_declaration: 1457 noclass_declmods deftyp { 1458 $$ = declare_1_abstract(abstract_name()); 1459 } 1460 | noclass_declspecs deftyp { 1461 $$ = declare_1_abstract(abstract_name()); 1462 } 1463 | noclass_declmods deftyp abstract_decl { 1464 $$ = declare_1_abstract($3); 1465 } 1466 | noclass_declspecs deftyp abstract_decl { 1467 $$ = declare_1_abstract($3); 1468 } 1469 ; 1470 1471 abstract_decl: 1472 pointer { 1473 $$ = add_pointer(abstract_name(), $1); 1474 } 1475 | direct_abstract_decl { 1476 $$ = $1; 1477 } 1478 | pointer direct_abstract_decl { 1479 $$ = add_pointer($2, $1); 1480 } 1481 | T_TYPEOF term { 1482 $$ = mktempsym($2->tn_type); 1483 } 1484 ; 1485 1486 direct_abstract_decl: 1487 T_LPAREN abstract_decl T_RPAREN { 1488 $$ = $2; 1489 } 1490 | T_LBRACK T_RBRACK { 1491 $$ = add_array(abstract_name(), false, 0); 1492 } 1493 | T_LBRACK array_size T_RBRACK { 1494 $$ = add_array(abstract_name(), true, to_int_constant($2, false)); 1495 } 1496 | type_attribute direct_abstract_decl { 1497 $$ = $2; 1498 } 1499 | direct_abstract_decl T_LBRACK T_RBRACK { 1500 $$ = add_array($1, false, 0); 1501 } 1502 | direct_abstract_decl T_LBRACK array_size T_RBRACK { 1503 $$ = add_array($1, true, to_int_constant($3, false)); 1504 } 1505 | abstract_decl_param_list opt_asm_or_symbolrename { 1506 $$ = add_function(symbolrename(abstract_name(), $2), $1); 1507 end_declaration_level(); 1508 block_level--; 1509 } 1510 | direct_abstract_decl abstract_decl_param_list opt_asm_or_symbolrename { 1511 $$ = add_function(symbolrename($1, $3), $2); 1512 end_declaration_level(); 1513 block_level--; 1514 } 1515 | direct_abstract_decl type_attribute_list 1516 ; 1517 1518 non_expr_statement: 1519 type_attribute T_SEMI 1520 | labeled_statement 1521 | compound_statement 1522 | selection_statement 1523 | iteration_statement 1524 | jump_statement { 1525 seen_fallthrough = false; 1526 } 1527 | asm_statement 1528 ; 1529 1530 statement: /* C99 6.8 */ 1531 expr_statement 1532 | non_expr_statement 1533 ; 1534 1535 labeled_statement: /* C99 6.8.1 */ 1536 label statement 1537 ; 1538 1539 label: 1540 T_NAME T_COLON { 1541 symtyp = FLABEL; 1542 named_label(getsym($1)); 1543 } 1544 | T_CASE constant_expr T_COLON { 1545 case_label($2); 1546 seen_fallthrough = true; 1547 } 1548 | T_CASE constant_expr T_ELLIPSIS constant_expr T_COLON { 1549 /* XXX: We don't fill all cases */ 1550 case_label($2); 1551 seen_fallthrough = true; 1552 } 1553 | T_DEFAULT T_COLON { 1554 default_label(); 1555 seen_fallthrough = true; 1556 } 1557 ; 1558 1559 compound_statement: /* C99 6.8.2 */ 1560 compound_statement_lbrace compound_statement_rbrace 1561 | compound_statement_lbrace block_item_list compound_statement_rbrace 1562 ; 1563 1564 compound_statement_lbrace: 1565 T_LBRACE { 1566 block_level++; 1567 mem_block_level++; 1568 begin_declaration_level(AUTO); 1569 } 1570 ; 1571 1572 compound_statement_rbrace: 1573 T_RBRACE { 1574 end_declaration_level(); 1575 freeblk(); 1576 mem_block_level--; 1577 block_level--; 1578 seen_fallthrough = false; 1579 } 1580 ; 1581 1582 block_item_list: 1583 block_item 1584 | block_item_list block_item { 1585 if (!Sflag && $1 && !$2) 1586 /* declarations after statements is a C99 feature */ 1587 c99ism(327); 1588 } 1589 ; 1590 1591 block_item: 1592 statement { 1593 $$ = true; 1594 restore_warning_flags(); 1595 } 1596 | declaration { 1597 $$ = false; 1598 restore_warning_flags(); 1599 } 1600 ; 1601 1602 expr_statement: 1603 expr T_SEMI { 1604 expr($1, false, false, false, false); 1605 seen_fallthrough = false; 1606 } 1607 | T_SEMI { 1608 seen_fallthrough = false; 1609 } 1610 ; 1611 1612 /* 1613 * The following two productions are used to implement 1614 * ({ [[decl-list] stmt-list] }). 1615 * XXX: This is not well tested. 1616 */ 1617 expr_statement_val: 1618 expr T_SEMI { 1619 /* XXX: We should really do that only on the last name */ 1620 if ($1->tn_op == NAME) 1621 $1->tn_sym->s_used = true; 1622 $$ = $1; 1623 expr($1, false, false, false, false); 1624 seen_fallthrough = false; 1625 } 1626 | non_expr_statement { 1627 $$ = expr_zalloc_tnode(); 1628 $$->tn_type = gettyp(VOID); 1629 } 1630 ; 1631 1632 expr_statement_list: 1633 expr_statement_val 1634 | expr_statement_list expr_statement_val { 1635 $$ = $2; 1636 } 1637 ; 1638 1639 selection_statement: /* C99 6.8.4 */ 1640 if_without_else { 1641 save_warning_flags(); 1642 if2(); 1643 if3(false); 1644 } 1645 | if_without_else T_ELSE { 1646 save_warning_flags(); 1647 if2(); 1648 } statement { 1649 clear_warning_flags(); 1650 if3(true); 1651 } 1652 | if_without_else T_ELSE error { 1653 clear_warning_flags(); 1654 if3(false); 1655 } 1656 | switch_expr statement { 1657 clear_warning_flags(); 1658 switch2(); 1659 } 1660 | switch_expr error { 1661 clear_warning_flags(); 1662 switch2(); 1663 } 1664 ; 1665 1666 if_without_else: 1667 if_expr statement 1668 | if_expr error 1669 ; 1670 1671 if_expr: 1672 T_IF T_LPAREN expr T_RPAREN { 1673 if1($3); 1674 clear_warning_flags(); 1675 } 1676 ; 1677 1678 switch_expr: 1679 T_SWITCH T_LPAREN expr T_RPAREN { 1680 switch1($3); 1681 clear_warning_flags(); 1682 } 1683 ; 1684 1685 association: 1686 type_name T_COLON expr 1687 | T_DEFAULT T_COLON expr 1688 ; 1689 1690 association_list: 1691 association 1692 | association_list T_COMMA association 1693 ; 1694 1695 generic_expr: 1696 T_GENERIC T_LPAREN expr T_COMMA association_list T_RPAREN { 1697 $$ = $3; 1698 } 1699 ; 1700 1701 do_statement: 1702 do statement { 1703 clear_warning_flags(); 1704 } 1705 ; 1706 1707 iteration_statement: /* C99 6.8.5 */ 1708 while_expr statement { 1709 clear_warning_flags(); 1710 while2(); 1711 } 1712 | while_expr error { 1713 clear_warning_flags(); 1714 while2(); 1715 } 1716 | do_statement do_while_expr { 1717 do2($2); 1718 seen_fallthrough = false; 1719 } 1720 | do error { 1721 clear_warning_flags(); 1722 do2(NULL); 1723 } 1724 | for_exprs statement { 1725 clear_warning_flags(); 1726 for2(); 1727 end_declaration_level(); 1728 block_level--; 1729 } 1730 | for_exprs error { 1731 clear_warning_flags(); 1732 for2(); 1733 end_declaration_level(); 1734 block_level--; 1735 } 1736 ; 1737 1738 while_expr: 1739 T_WHILE T_LPAREN expr T_RPAREN { 1740 while1($3); 1741 clear_warning_flags(); 1742 } 1743 ; 1744 1745 do: 1746 T_DO { 1747 do1(); 1748 } 1749 ; 1750 1751 do_while_expr: 1752 T_WHILE T_LPAREN expr T_RPAREN T_SEMI { 1753 $$ = $3; 1754 } 1755 ; 1756 1757 for_start: 1758 T_FOR T_LPAREN { 1759 begin_declaration_level(AUTO); 1760 block_level++; 1761 } 1762 ; 1763 for_exprs: 1764 for_start declaration_specifiers deftyp notype_init_decls T_SEMI 1765 opt_expr T_SEMI opt_expr T_RPAREN { 1766 /* variable declaration in for loop */ 1767 c99ism(325); 1768 for1(NULL, $6, $8); 1769 clear_warning_flags(); 1770 } 1771 | for_start opt_expr T_SEMI opt_expr T_SEMI opt_expr T_RPAREN { 1772 for1($2, $4, $6); 1773 clear_warning_flags(); 1774 } 1775 ; 1776 1777 opt_expr: 1778 /* empty */ { 1779 $$ = NULL; 1780 } 1781 | expr { 1782 $$ = $1; 1783 } 1784 ; 1785 1786 jump_statement: /* C99 6.8.6 */ 1787 goto identifier T_SEMI { 1788 do_goto(getsym($2)); 1789 } 1790 | goto error T_SEMI { 1791 symtyp = FVFT; 1792 } 1793 | T_CONTINUE T_SEMI { 1794 do_continue(); 1795 } 1796 | T_BREAK T_SEMI { 1797 do_break(); 1798 } 1799 | T_RETURN T_SEMI { 1800 do_return(NULL); 1801 } 1802 | T_RETURN expr T_SEMI { 1803 do_return($2); 1804 } 1805 ; 1806 1807 goto: 1808 T_GOTO { 1809 symtyp = FLABEL; 1810 } 1811 ; 1812 1813 asm_statement: 1814 T_ASM T_LPAREN read_until_rparen T_SEMI { 1815 setasm(); 1816 } 1817 | T_ASM T_QUAL T_LPAREN read_until_rparen T_SEMI { 1818 setasm(); 1819 } 1820 | T_ASM error 1821 ; 1822 1823 read_until_rparen: 1824 /* empty */ { 1825 ignore_up_to_rparen(); 1826 } 1827 ; 1828 1829 declaration_list: 1830 declaration { 1831 clear_warning_flags(); 1832 } 1833 | declaration_list declaration { 1834 clear_warning_flags(); 1835 } 1836 ; 1837 1838 constant_expr: /* C99 6.6 */ 1839 expr %prec T_ASSIGN { 1840 $$ = $1; 1841 } 1842 ; 1843 1844 expr: 1845 expr T_ASTERISK expr { 1846 $$ = build(MULT, $1, $3); 1847 } 1848 | expr T_MULTIPLICATIVE expr { 1849 $$ = build($2, $1, $3); 1850 } 1851 | expr T_ADDITIVE expr { 1852 $$ = build($2, $1, $3); 1853 } 1854 | expr T_SHIFT expr { 1855 $$ = build($2, $1, $3); 1856 } 1857 | expr T_RELATIONAL expr { 1858 $$ = build($2, $1, $3); 1859 } 1860 | expr T_EQUALITY expr { 1861 $$ = build($2, $1, $3); 1862 } 1863 | expr T_AMPER expr { 1864 $$ = build(BITAND, $1, $3); 1865 } 1866 | expr T_BITXOR expr { 1867 $$ = build(BITXOR, $1, $3); 1868 } 1869 | expr T_BITOR expr { 1870 $$ = build(BITOR, $1, $3); 1871 } 1872 | expr T_LOGAND expr { 1873 $$ = build(LOGAND, $1, $3); 1874 } 1875 | expr T_LOGOR expr { 1876 $$ = build(LOGOR, $1, $3); 1877 } 1878 | expr T_QUEST expr T_COLON expr { 1879 $$ = build(QUEST, $1, build(COLON, $3, $5)); 1880 } 1881 | expr T_ASSIGN expr { 1882 $$ = build(ASSIGN, $1, $3); 1883 } 1884 | expr T_OPASSIGN expr { 1885 $$ = build($2, $1, $3); 1886 } 1887 | expr T_COMMA expr { 1888 $$ = build(COMMA, $1, $3); 1889 } 1890 | term { 1891 $$ = $1; 1892 } 1893 | generic_expr { 1894 $$ = $1; 1895 } 1896 ; 1897 1898 term: 1899 T_NAME { 1900 /* XXX really necessary? */ 1901 if (yychar < 0) 1902 yychar = yylex(); 1903 $$ = new_name_node(getsym($1), yychar); 1904 } 1905 | string { 1906 $$ = new_string_node($1); 1907 } 1908 | T_CON { 1909 $$ = expr_new_constant(gettyp($1->v_tspec), $1); 1910 } 1911 | T_LPAREN expr T_RPAREN { 1912 if ($2 != NULL) 1913 $2->tn_parenthesized = true; 1914 $$ = $2; 1915 } 1916 | T_LPAREN compound_statement_lbrace declaration_list 1917 expr_statement_list { 1918 block_level--; 1919 mem_block_level--; 1920 begin_initialization(mktempsym(dup_type($4->tn_type))); 1921 mem_block_level++; 1922 block_level++; 1923 /* ({ }) is a GCC extension */ 1924 gnuism(320); 1925 } compound_statement_rbrace T_RPAREN { 1926 $$ = new_name_node(*current_initsym(), 0); 1927 end_initialization(); 1928 } 1929 | T_LPAREN compound_statement_lbrace expr_statement_list { 1930 block_level--; 1931 mem_block_level--; 1932 begin_initialization(mktempsym($3->tn_type)); 1933 mem_block_level++; 1934 block_level++; 1935 /* ({ }) is a GCC extension */ 1936 gnuism(320); 1937 } compound_statement_rbrace T_RPAREN { 1938 $$ = new_name_node(*current_initsym(), 0); 1939 end_initialization(); 1940 } 1941 | term T_INCDEC { 1942 $$ = build($2 == INC ? INCAFT : DECAFT, $1, NULL); 1943 } 1944 | T_INCDEC term { 1945 $$ = build($1 == INC ? INCBEF : DECBEF, $2, NULL); 1946 } 1947 | T_ASTERISK term { 1948 $$ = build(INDIR, $2, NULL); 1949 } 1950 | T_AMPER term { 1951 $$ = build(ADDR, $2, NULL); 1952 } 1953 | T_UNARY term { 1954 $$ = build($1, $2, NULL); 1955 } 1956 | T_ADDITIVE term { 1957 if (tflag && $1 == PLUS) { 1958 /* unary + is illegal in traditional C */ 1959 warning(100); 1960 } 1961 $$ = build($1 == PLUS ? UPLUS : UMINUS, $2, NULL); 1962 } 1963 | term T_LBRACK expr T_RBRACK { 1964 $$ = build(INDIR, build(PLUS, $1, $3), NULL); 1965 } 1966 | term T_LPAREN T_RPAREN { 1967 $$ = new_function_call_node($1, NULL); 1968 } 1969 | term T_LPAREN func_arg_list T_RPAREN { 1970 $$ = new_function_call_node($1, $3); 1971 } 1972 | term point_or_arrow T_NAME { 1973 if ($1 != NULL) { 1974 sym_t *msym; 1975 /* 1976 * XXX struct_or_union_member should be integrated 1977 * in build() 1978 */ 1979 if ($2 == ARROW) { 1980 /* 1981 * must do this before struct_or_union_member 1982 * is called 1983 */ 1984 $1 = cconv($1); 1985 } 1986 msym = struct_or_union_member($1, $2, getsym($3)); 1987 $$ = build($2, $1, new_name_node(msym, 0)); 1988 } else { 1989 $$ = NULL; 1990 } 1991 } 1992 | T_REAL term { 1993 $$ = build(REAL, $2, NULL); 1994 } 1995 | T_IMAG term { 1996 $$ = build(IMAG, $2, NULL); 1997 } 1998 | T_EXTENSION term { 1999 $$ = $2; 2000 } 2001 | T_REAL T_LPAREN term T_RPAREN { 2002 $$ = build(REAL, $3, NULL); 2003 } 2004 | T_IMAG T_LPAREN term T_RPAREN { 2005 $$ = build(IMAG, $3, NULL); 2006 } 2007 | T_BUILTIN_OFFSETOF T_LPAREN type_name T_COMMA identifier T_RPAREN { 2008 symtyp = FMEMBER; 2009 $$ = build_offsetof($3, getsym($5)); 2010 } 2011 | T_SIZEOF term { 2012 $$ = $2 == NULL ? NULL : build_sizeof($2->tn_type); 2013 if ($$ != NULL) 2014 check_expr_misc($2, false, false, false, false, false, true); 2015 } 2016 | T_SIZEOF T_LPAREN type_name T_RPAREN %prec T_SIZEOF { 2017 $$ = build_sizeof($3); 2018 } 2019 | T_ALIGNOF T_LPAREN type_name T_RPAREN { 2020 $$ = build_alignof($3); 2021 } 2022 | T_LPAREN type_name T_RPAREN term %prec T_UNARY { 2023 $$ = cast($4, $2); 2024 } 2025 | T_LPAREN type_name T_RPAREN { /* C99 6.5.2.5 "Compound literals" */ 2026 sym_t *tmp = mktempsym($2); 2027 begin_initialization(tmp); 2028 cgram_declare(tmp, true, NULL); 2029 } init_lbrace initializer_list comma_opt init_rbrace { 2030 if (!Sflag) 2031 /* compound literals are a C9X/GCC extension */ 2032 gnuism(319); 2033 $$ = new_name_node(*current_initsym(), 0); 2034 end_initialization(); 2035 } 2036 ; 2037 2038 string: 2039 T_STRING { 2040 $$ = $1; 2041 } 2042 | T_STRING string2 { 2043 $$ = cat_strings($1, $2); 2044 } 2045 ; 2046 2047 string2: 2048 T_STRING { 2049 if (tflag) { 2050 /* concatenated strings are illegal in traditional C */ 2051 warning(219); 2052 } 2053 $$ = $1; 2054 } 2055 | string2 T_STRING { 2056 $$ = cat_strings($1, $2); 2057 } 2058 ; 2059 2060 func_arg_list: 2061 expr %prec T_COMMA { 2062 $$ = new_function_argument_node(NULL, $1); 2063 } 2064 | func_arg_list T_COMMA expr { 2065 $$ = new_function_argument_node($1, $3); 2066 } 2067 ; 2068 2069 point_or_arrow: 2070 T_MEMBACC { 2071 symtyp = FMEMBER; 2072 $$ = $1; 2073 } 2074 ; 2075 2076 point: 2077 T_MEMBACC { 2078 if ($1 != POINT) { 2079 /* syntax error '%s' */ 2080 error(249, yytext); 2081 } 2082 } 2083 ; 2084 2085 identifier: /* C99 6.4.2.1 */ 2086 T_NAME { 2087 $$ = $1; 2088 cgram_debug("name '%s'", $$->sb_name); 2089 } 2090 | T_TYPENAME { 2091 $$ = $1; 2092 cgram_debug("typename '%s'", $$->sb_name); 2093 } 2094 ; 2095 2096 comma_opt: 2097 T_COMMA 2098 | /* empty */ 2099 ; 2100 %% 2101 2102 /* ARGSUSED */ 2103 int 2104 yyerror(const char *msg) 2105 { 2106 /* syntax error '%s' */ 2107 error(249, yytext); 2108 if (++sytxerr >= 5) 2109 norecover(); 2110 return 0; 2111 } 2112 2113 static void 2114 cgram_declare(sym_t *decl, bool initflg, sbuf_t *renaming) 2115 { 2116 declare(decl, initflg, renaming); 2117 if (renaming != NULL) 2118 freeyyv(&renaming, T_NAME); 2119 } 2120 2121 /* 2122 * Discard all input tokens up to and including the next 2123 * unmatched right paren 2124 */ 2125 static void 2126 ignore_up_to_rparen(void) 2127 { 2128 int level; 2129 2130 if (yychar < 0) 2131 yychar = yylex(); 2132 freeyyv(&yylval, yychar); 2133 2134 level = 1; 2135 while (yychar != T_RPAREN || --level > 0) { 2136 if (yychar == T_LPAREN) { 2137 level++; 2138 } else if (yychar <= 0) { 2139 break; 2140 } 2141 freeyyv(&yylval, yychar = yylex()); 2142 } 2143 2144 yyclearin; 2145 } 2146 2147 static sym_t * 2148 symbolrename(sym_t *s, sbuf_t *sb) 2149 { 2150 if (sb != NULL) 2151 s->s_rename = sb->sb_name; 2152 return s; 2153 } 2154
Indexes created Fri Oct 03 02:09:57 GMT 2025