cgram.y revision 1.239
1 %{ 2 /* $NetBSD: cgram.y,v 1.239 2021/06/27 21:36:14 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 1.239 2021/06/27 21:36:14 rillig Exp $"); 39 #endif 40 41 #include <limits.h> 42 #include <stdlib.h> 43 #include <string.h> 44 45 #include "lint1.h" 46 47 extern char *yytext; 48 49 /* 50 * Contains the level of current declaration, used for symbol table entries. 51 * 0 is the top-level, > 0 is inside a function body. 52 */ 53 int block_level; 54 55 /* 56 * level for memory allocation. Normally the same as block_level. 57 * An exception is the declaration of arguments in prototypes. Memory 58 * for these can't be freed after the declaration, but symbols must 59 * be removed from the symbol table after the declaration. 60 */ 61 int mem_block_level; 62 63 /* 64 * Save the no-warns state and restore it to avoid the problem where 65 * if (expr) { stmt } / * NOLINT * / stmt; 66 */ 67 static int olwarn = LWARN_BAD; 68 69 static void cgram_declare(sym_t *, bool, sbuf_t *); 70 static void ignore_up_to_rparen(void); 71 static sym_t *symbolrename(sym_t *, sbuf_t *); 72 73 74 #ifdef DEBUG 75 static void 76 CLEAR_WARN_FLAGS(const char *file, size_t line) 77 { 78 printf("%s:%d: %s:%zu: clearing flags\n", 79 curr_pos.p_file, curr_pos.p_line, file, line); 80 clear_warn_flags(); 81 olwarn = LWARN_BAD; 82 } 83 84 static void 85 SAVE_WARN_FLAGS(const char *file, size_t line) 86 { 87 lint_assert(olwarn == LWARN_BAD); 88 printf("%s:%d: %s:%zu: saving flags %d\n", 89 curr_pos.p_file, curr_pos.p_line, file, line, lwarn); 90 olwarn = lwarn; 91 } 92 93 static void 94 RESTORE_WARN_FLAGS(const char *file, size_t line) 95 { 96 if (olwarn != LWARN_BAD) { 97 lwarn = olwarn; 98 printf("%s:%d: %s:%zu: restoring flags %d\n", 99 curr_pos.p_file, curr_pos.p_line, file, line, lwarn); 100 olwarn = LWARN_BAD; 101 } else 102 CLEAR_WARN_FLAGS(file, line); 103 } 104 #define cgram_debug(fmt, args...) printf("cgram_debug: " fmt "\n", ##args) 105 #else 106 #define CLEAR_WARN_FLAGS(f, l) clear_warn_flags(), olwarn = LWARN_BAD 107 #define SAVE_WARN_FLAGS(f, l) olwarn = lwarn 108 #define RESTORE_WARN_FLAGS(f, l) \ 109 (void)(olwarn == LWARN_BAD ? (clear_warn_flags(), 0) : (lwarn = olwarn)) 110 #define cgram_debug(fmt, args...) do { } while (false) 111 #endif 112 113 #define clear_warning_flags() CLEAR_WARN_FLAGS(__FILE__, __LINE__) 114 #define save_warning_flags() SAVE_WARN_FLAGS(__FILE__, __LINE__) 115 #define restore_warning_flags() RESTORE_WARN_FLAGS(__FILE__, __LINE__) 116 117 /* unbind the anonymous struct members from the struct */ 118 static void 119 anonymize(sym_t *s) 120 { 121 for ( ; s != NULL; s = s->s_next) 122 s->s_styp = NULL; 123 } 124 %} 125 126 %expect 182 127 128 %union { 129 val_t *y_val; 130 sbuf_t *y_sb; 131 sym_t *y_sym; 132 op_t y_op; 133 scl_t y_scl; 134 tspec_t y_tspec; 135 tqual_t y_tqual; 136 type_t *y_type; 137 tnode_t *y_tnode; 138 range_t y_range; 139 strg_t *y_string; 140 pqinf_t *y_pqinf; 141 bool y_seen_statement; 142 struct generic_association_types *y_types; 143 }; 144 145 %token T_LBRACE T_RBRACE T_LBRACK T_RBRACK T_LPAREN T_RPAREN 146 %token T_POINT T_ARROW 147 %token <y_op> T_UNARY 148 %token <y_op> T_INCDEC 149 %token T_SIZEOF 150 %token T_BUILTIN_OFFSETOF 151 %token T_TYPEOF 152 %token T_EXTENSION 153 %token T_ALIGNAS 154 %token T_ALIGNOF 155 %token T_ASTERISK 156 %token <y_op> T_MULTIPLICATIVE 157 %token <y_op> T_ADDITIVE 158 %token <y_op> T_SHIFT 159 %token <y_op> T_RELATIONAL 160 %token <y_op> T_EQUALITY 161 %token T_AMPER 162 %token T_BITXOR 163 %token T_BITOR 164 %token T_LOGAND 165 %token T_LOGOR 166 %token T_QUEST 167 %token T_COLON 168 %token T_ASSIGN 169 %token <y_op> T_OPASSIGN 170 %token T_COMMA 171 %token T_SEMI 172 %token T_ELLIPSIS 173 %token T_REAL 174 %token T_IMAG 175 %token T_GENERIC 176 %token T_NORETURN 177 178 /* storage classes (extern, static, auto, register and typedef) */ 179 %token <y_scl> T_SCLASS 180 181 /* 182 * predefined type keywords (char, int, short, long, unsigned, signed, 183 * float, double, void); see T_TYPENAME 184 */ 185 %token <y_tspec> T_TYPE 186 187 /* qualifiers (const, volatile, restrict, _Thread_local) */ 188 %token <y_tqual> T_QUAL 189 190 /* struct or union */ 191 %token <y_tspec> T_STRUCT_OR_UNION 192 193 /* remaining keywords */ 194 %token T_ASM 195 %token T_BREAK 196 %token T_CASE 197 %token T_CONTINUE 198 %token T_DEFAULT 199 %token T_DO 200 %token T_ELSE 201 %token T_ENUM 202 %token T_FOR 203 %token T_GOTO 204 %token T_IF 205 %token T_PACKED 206 %token T_RETURN 207 %token T_SWITCH 208 %token T_SYMBOLRENAME 209 %token T_WHILE 210 /* Type Attributes */ 211 %token <y_type> T_ATTRIBUTE 212 %token <y_type> T_AT_ALIAS 213 %token <y_type> T_AT_ALIGNED 214 %token <y_type> T_AT_ALLOC_SIZE 215 %token <y_type> T_AT_ALWAYS_INLINE 216 %token <y_type> T_AT_BOUNDED 217 %token <y_type> T_AT_BUFFER 218 %token <y_type> T_AT_COLD 219 %token <y_type> T_AT_COMMON 220 %token <y_type> T_AT_CONSTRUCTOR 221 %token <y_type> T_AT_DEPRECATED 222 %token <y_type> T_AT_DESTRUCTOR 223 %token <y_type> T_AT_FALLTHROUGH 224 %token <y_type> T_AT_FORMAT 225 %token <y_type> T_AT_FORMAT_ARG 226 %token <y_type> T_AT_FORMAT_GNU_PRINTF 227 %token <y_type> T_AT_FORMAT_PRINTF 228 %token <y_type> T_AT_FORMAT_SCANF 229 %token <y_type> T_AT_FORMAT_STRFMON 230 %token <y_type> T_AT_FORMAT_STRFTIME 231 %token <y_type> T_AT_FORMAT_SYSLOG 232 %token <y_type> T_AT_GNU_INLINE 233 %token <y_type> T_AT_MALLOC 234 %token <y_type> T_AT_MAY_ALIAS 235 %token <y_type> T_AT_MINBYTES 236 %token <y_type> T_AT_MODE 237 %token <y_type> T_AT_NOINLINE 238 %token <y_type> T_AT_NONNULL 239 %token <y_type> T_AT_NONSTRING 240 %token <y_type> T_AT_NORETURN 241 %token <y_type> T_AT_NOTHROW 242 %token <y_type> T_AT_NO_INSTRUMENT_FUNCTION 243 %token <y_type> T_AT_OPTIMIZE 244 %token <y_type> T_AT_PACKED 245 %token <y_type> T_AT_PCS 246 %token <y_type> T_AT_PURE 247 %token <y_type> T_AT_RETURNS_TWICE 248 %token <y_type> T_AT_SECTION 249 %token <y_type> T_AT_SENTINEL 250 %token <y_type> T_AT_STRING 251 %token <y_type> T_AT_TLS_MODEL 252 %token <y_type> T_AT_TUNION 253 %token <y_type> T_AT_UNUSED 254 %token <y_type> T_AT_USED 255 %token <y_type> T_AT_VISIBILITY 256 %token <y_type> T_AT_WARN_UNUSED_RESULT 257 %token <y_type> T_AT_WEAK 258 259 %left T_COMMA 260 %right T_ASSIGN T_OPASSIGN 261 %right T_QUEST T_COLON 262 %left T_LOGOR 263 %left T_LOGAND 264 %left T_BITOR 265 %left T_BITXOR 266 %left T_AMPER 267 %left T_EQUALITY 268 %left T_RELATIONAL 269 %left T_SHIFT 270 %left T_ADDITIVE 271 %left T_ASTERISK T_MULTIPLICATIVE 272 %right T_UNARY T_INCDEC T_SIZEOF T_REAL T_IMAG 273 %left T_LPAREN T_LBRACK T_POINT T_ARROW 274 275 %token <y_sb> T_NAME 276 %token <y_sb> T_TYPENAME 277 %token <y_val> T_CON 278 %token <y_string> T_STRING 279 280 %type <y_sym> func_decl 281 %type <y_sym> notype_decl 282 %type <y_sym> type_decl 283 %type <y_type> typespec 284 %type <y_type> clrtyp_typespec 285 %type <y_type> notype_typespec 286 %type <y_type> struct_spec 287 %type <y_type> enum_spec 288 %type <y_sym> struct_tag 289 %type <y_sym> enum_tag 290 %type <y_tspec> struct 291 %type <y_sym> struct_declaration 292 %type <y_sb> identifier 293 %type <y_sym> member_declaration_list_with_rbrace 294 %type <y_sym> member_declaration_list 295 %type <y_sym> member_declaration 296 %type <y_sym> notype_member_decls 297 %type <y_sym> type_member_decls 298 %type <y_sym> notype_member_decl 299 %type <y_sym> type_member_decl 300 %type <y_tnode> constant_expr 301 %type <y_tnode> array_size 302 %type <y_sym> enum_declaration 303 %type <y_sym> enums_with_opt_comma 304 %type <y_sym> enums 305 %type <y_sym> enumerator 306 %type <y_sym> enumeration_constant 307 %type <y_sym> notype_direct_decl 308 %type <y_sym> type_direct_decl 309 %type <y_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> assignment_expression 327 %type <y_tnode> gcc_statement_expr_list 328 %type <y_tnode> gcc_statement_expr_item 329 %type <y_tnode> term 330 %type <y_tnode> generic_selection 331 %type <y_tnode> func_arg_list 332 %type <y_op> point_or_arrow 333 %type <y_type> type_name 334 %type <y_sym> abstract_declaration 335 %type <y_tnode> do_while_expr 336 %type <y_tnode> opt_expr 337 %type <y_string> string 338 %type <y_string> string2 339 %type <y_sb> opt_asm_or_symbolrename 340 %type <y_range> range 341 %type <y_seen_statement> block_item_list 342 %type <y_seen_statement> block_item 343 %type <y_types> generic_assoc_list 344 %type <y_types> generic_association 345 346 347 %% 348 349 program: 350 /* empty */ { 351 if (sflag) { 352 /* empty translation unit */ 353 error(272); 354 } else if (!tflag) { 355 /* empty translation unit */ 356 warning(272); 357 } 358 } 359 | translation_unit 360 ; 361 362 translation_unit: /* C99 6.9 */ 363 external_declaration 364 | translation_unit external_declaration 365 ; 366 367 external_declaration: /* C99 6.9 */ 368 asm_statement 369 | function_definition { 370 global_clean_up_decl(false); 371 clear_warning_flags(); 372 } 373 | top_level_declaration { 374 global_clean_up_decl(false); 375 clear_warning_flags(); 376 } 377 ; 378 379 /* 380 * On the top level, lint allows several forms of declarations that it doesn't 381 * allow in functions. For example, a single ';' is an empty declaration and 382 * is supported by some compilers, but in a function it would be an empty 383 * statement, not a declaration. This makes a difference in C90 mode, where 384 * a statement must not be followed by a declaration. 385 * 386 * See 'declaration' for all other declarations. 387 */ 388 top_level_declaration: /* C99 6.9 calls this 'declaration' */ 389 T_SEMI { 390 if (sflag) { 391 /* empty declaration */ 392 error(0); 393 } else if (!tflag) { 394 /* empty declaration */ 395 warning(0); 396 } 397 } 398 | clrtyp deftyp notype_init_decls T_SEMI { 399 if (sflag) { 400 /* old style declaration; add 'int' */ 401 error(1); 402 } else if (!tflag) { 403 /* old style declaration; add 'int' */ 404 warning(1); 405 } 406 } 407 | declmods deftyp T_SEMI { 408 if (dcs->d_scl == TYPEDEF) { 409 /* typedef declares no type name */ 410 warning(72); 411 } else { 412 /* empty declaration */ 413 warning(2); 414 } 415 } 416 | declmods deftyp notype_init_decls T_SEMI 417 | declaration_specifiers deftyp T_SEMI { 418 if (dcs->d_scl == TYPEDEF) { 419 /* typedef declares no type name */ 420 warning(72); 421 } else if (!dcs->d_nonempty_decl) { 422 /* empty declaration */ 423 warning(2); 424 } 425 } 426 | declaration_specifiers deftyp type_init_decls T_SEMI 427 | error T_SEMI { 428 global_clean_up(); 429 } 430 | error T_RBRACE { 431 global_clean_up(); 432 } 433 ; 434 435 function_definition: /* C99 6.9.1 */ 436 func_decl { 437 if ($1->s_type->t_tspec != FUNC) { 438 /* syntax error '%s' */ 439 error(249, yytext); 440 YYERROR; 441 } 442 if ($1->s_type->t_typedef) { 443 /* ()-less function definition */ 444 error(64); 445 YYERROR; 446 } 447 funcdef($1); 448 block_level++; 449 begin_declaration_level(ARG); 450 if (lwarn == LWARN_NONE) 451 $1->s_used = true; 452 } arg_declaration_list_opt { 453 end_declaration_level(); 454 block_level--; 455 check_func_lint_directives(); 456 check_func_old_style_arguments(); 457 begin_control_statement(CS_FUNCTION_BODY); 458 } compound_statement { 459 funcend(); 460 end_control_statement(CS_FUNCTION_BODY); 461 } 462 ; 463 464 func_decl: 465 clrtyp deftyp notype_decl { 466 $$ = $3; 467 } 468 | declmods deftyp notype_decl { 469 $$ = $3; 470 } 471 | declaration_specifiers deftyp type_decl { 472 $$ = $3; 473 } 474 ; 475 476 arg_declaration_list_opt: /* C99 6.9.1p13 example 1 */ 477 /* empty */ 478 | arg_declaration_list 479 ; 480 481 arg_declaration_list: /* C99 6.9.1p13 example 1 */ 482 arg_declaration 483 | arg_declaration_list arg_declaration 484 /* XXX or better "arg_declaration error" ? */ 485 | error 486 ; 487 488 /* 489 * "arg_declaration" is separated from "declaration" because it 490 * needs other error handling. 491 */ 492 arg_declaration: 493 declmods deftyp T_SEMI { 494 /* empty declaration */ 495 warning(2); 496 } 497 | declmods deftyp notype_init_decls T_SEMI 498 | declaration_specifiers deftyp T_SEMI { 499 if (!dcs->d_nonempty_decl) { 500 /* empty declaration */ 501 warning(2); 502 } else { 503 /* '%s' declared in argument declaration list */ 504 warning(3, type_name(dcs->d_type)); 505 } 506 } 507 | declaration_specifiers deftyp type_init_decls T_SEMI { 508 if (dcs->d_nonempty_decl) { 509 /* '%s' declared in argument declaration list */ 510 warning(3, type_name(dcs->d_type)); 511 } 512 } 513 | declmods error 514 | declaration_specifiers error 515 ; 516 517 declaration: /* C99 6.7 */ 518 declmods deftyp T_SEMI { 519 if (dcs->d_scl == TYPEDEF) { 520 /* typedef declares no type name */ 521 warning(72); 522 } else { 523 /* empty declaration */ 524 warning(2); 525 } 526 } 527 | declmods deftyp notype_init_decls T_SEMI 528 | declaration_specifiers deftyp T_SEMI { 529 if (dcs->d_scl == TYPEDEF) { 530 /* typedef declares no type name */ 531 warning(72); 532 } else if (!dcs->d_nonempty_decl) { 533 /* empty declaration */ 534 warning(2); 535 } 536 } 537 | declaration_specifiers deftyp type_init_decls T_SEMI 538 | error T_SEMI 539 ; 540 541 type_attribute_format_type: 542 T_AT_FORMAT_GNU_PRINTF 543 | T_AT_FORMAT_PRINTF 544 | T_AT_FORMAT_SCANF 545 | T_AT_FORMAT_STRFMON 546 | T_AT_FORMAT_STRFTIME 547 | T_AT_FORMAT_SYSLOG 548 ; 549 550 type_attribute_bounded_type: 551 T_AT_MINBYTES 552 | T_AT_STRING 553 | T_AT_BUFFER 554 ; 555 556 557 type_attribute_spec: 558 /* empty */ 559 | T_AT_ALWAYS_INLINE 560 | T_AT_ALIAS T_LPAREN string T_RPAREN 561 | T_AT_ALIGNED T_LPAREN constant_expr T_RPAREN 562 | T_AT_ALIGNED 563 | T_AT_ALLOC_SIZE T_LPAREN constant_expr T_COMMA constant_expr T_RPAREN 564 | T_AT_ALLOC_SIZE T_LPAREN constant_expr T_RPAREN 565 | T_AT_BOUNDED T_LPAREN type_attribute_bounded_type 566 T_COMMA constant_expr T_COMMA constant_expr T_RPAREN 567 | T_AT_COLD 568 | T_AT_COMMON 569 | T_AT_CONSTRUCTOR T_LPAREN constant_expr T_RPAREN 570 | T_AT_CONSTRUCTOR 571 | T_AT_DEPRECATED T_LPAREN string T_RPAREN 572 | T_AT_DEPRECATED 573 | T_AT_DESTRUCTOR T_LPAREN constant_expr T_RPAREN 574 | T_AT_DESTRUCTOR 575 | T_AT_FALLTHROUGH { 576 fallthru(1); 577 } 578 | T_AT_FORMAT T_LPAREN type_attribute_format_type T_COMMA 579 constant_expr T_COMMA constant_expr T_RPAREN 580 | T_AT_FORMAT_ARG T_LPAREN constant_expr T_RPAREN 581 | T_AT_GNU_INLINE 582 | T_AT_MALLOC 583 | T_AT_MAY_ALIAS 584 | T_AT_MODE T_LPAREN T_NAME T_RPAREN 585 | T_AT_NOINLINE 586 | T_AT_NONNULL T_LPAREN constant_expr_list_opt T_RPAREN 587 | T_AT_NONNULL 588 | T_AT_NONSTRING 589 | T_AT_NORETURN 590 | T_AT_NOTHROW 591 | T_AT_NO_INSTRUMENT_FUNCTION 592 | T_AT_OPTIMIZE T_LPAREN string T_RPAREN 593 | T_AT_PACKED { 594 addpacked(); 595 } 596 | T_AT_PCS T_LPAREN string T_RPAREN 597 | T_AT_PURE 598 | T_AT_RETURNS_TWICE 599 | T_AT_SECTION T_LPAREN string T_RPAREN 600 | T_AT_SENTINEL T_LPAREN constant_expr T_RPAREN 601 | T_AT_SENTINEL 602 | T_AT_TLS_MODEL T_LPAREN string T_RPAREN 603 | T_AT_TUNION 604 | T_AT_UNUSED { 605 add_attr_used(); 606 } 607 | T_AT_USED { 608 add_attr_used(); 609 } 610 | T_AT_VISIBILITY T_LPAREN constant_expr T_RPAREN 611 | T_AT_WARN_UNUSED_RESULT 612 | T_AT_WEAK 613 | T_QUAL { 614 if ($1 != CONST) 615 yyerror("Bad attribute"); 616 } 617 ; 618 619 type_attribute_spec_list: 620 type_attribute_spec 621 | type_attribute_spec_list T_COMMA type_attribute_spec 622 ; 623 624 align_as: 625 typespec 626 | constant_expr 627 ; 628 629 type_attribute: 630 T_ATTRIBUTE T_LPAREN T_LPAREN { 631 attron = true; 632 } type_attribute_spec_list { 633 attron = false; 634 } T_RPAREN T_RPAREN 635 | T_ALIGNAS T_LPAREN align_as T_RPAREN { 636 } 637 | T_PACKED { 638 addpacked(); 639 } 640 | T_NORETURN { 641 } 642 ; 643 644 type_attribute_list: 645 type_attribute 646 | type_attribute_list type_attribute 647 ; 648 649 clrtyp: 650 /* empty */ { 651 clrtyp(); 652 } 653 ; 654 655 deftyp: 656 /* empty */ { 657 deftyp(); 658 } 659 ; 660 661 declaration_specifiers: /* C99 6.7 */ 662 clrtyp_typespec { 663 add_type($1); 664 } 665 | declmods typespec { 666 add_type($2); 667 } 668 | type_attribute declaration_specifiers 669 | declaration_specifiers declmod 670 | declaration_specifiers notype_typespec { 671 add_type($2); 672 } 673 ; 674 675 declmods: 676 clrtyp T_QUAL { 677 add_qualifier($2); 678 } 679 | clrtyp T_SCLASS { 680 add_storage_class($2); 681 } 682 | declmods declmod 683 ; 684 685 declmod: 686 T_QUAL { 687 add_qualifier($1); 688 } 689 | T_SCLASS { 690 add_storage_class($1); 691 } 692 | type_attribute_list 693 ; 694 695 clrtyp_typespec: 696 clrtyp notype_typespec { 697 $$ = $2; 698 } 699 | T_TYPENAME clrtyp { 700 $$ = getsym($1)->s_type; 701 } 702 ; 703 704 typespec: 705 notype_typespec { 706 $$ = $1; 707 } 708 | T_TYPENAME { 709 $$ = getsym($1)->s_type; 710 } 711 ; 712 713 notype_typespec: 714 T_TYPE { 715 $$ = gettyp($1); 716 } 717 | T_TYPEOF term { 718 $$ = $2->tn_type; 719 } 720 | struct_spec { 721 end_declaration_level(); 722 $$ = $1; 723 } 724 | enum_spec { 725 end_declaration_level(); 726 $$ = $1; 727 } 728 ; 729 730 struct_spec: 731 struct struct_tag { 732 /* 733 * STDC requires that "struct a;" always introduces 734 * a new tag if "a" is not declared at current level 735 * 736 * yychar is valid because otherwise the parser would not 737 * have been able to decide if it must shift or reduce 738 */ 739 $$ = mktag($2, $1, false, yychar == T_SEMI); 740 } 741 | struct struct_tag { 742 dcs->d_tagtyp = mktag($2, $1, true, false); 743 } struct_declaration { 744 $$ = complete_tag_struct_or_union(dcs->d_tagtyp, $4); 745 } 746 | struct { 747 dcs->d_tagtyp = mktag(NULL, $1, true, false); 748 } struct_declaration { 749 $$ = complete_tag_struct_or_union(dcs->d_tagtyp, $3); 750 } 751 | struct error { 752 symtyp = FVFT; 753 $$ = gettyp(INT); 754 } 755 ; 756 757 struct: 758 struct type_attribute 759 | T_STRUCT_OR_UNION { 760 symtyp = FTAG; 761 begin_declaration_level($1 == STRUCT ? MOS : MOU); 762 dcs->d_offset = 0; 763 dcs->d_stralign = CHAR_SIZE; 764 $$ = $1; 765 } 766 ; 767 768 struct_tag: 769 identifier { 770 $$ = getsym($1); 771 } 772 ; 773 774 struct_declaration: 775 struct_decl_lbrace member_declaration_list_with_rbrace { 776 $$ = $2; 777 } 778 ; 779 780 struct_decl_lbrace: 781 T_LBRACE { 782 symtyp = FVFT; 783 } 784 ; 785 786 member_declaration_list_with_rbrace: 787 member_declaration_list T_SEMI T_RBRACE { 788 $$ = $1; 789 } 790 | member_declaration_list T_RBRACE { 791 if (sflag) { 792 /* syntax req. ';' after last struct/union member */ 793 error(66); 794 } else { 795 /* syntax req. ';' after last struct/union member */ 796 warning(66); 797 } 798 $$ = $1; 799 } 800 | T_RBRACE { 801 $$ = NULL; 802 } 803 ; 804 805 opt_type_attribute: 806 /* empty */ 807 | type_attribute 808 ; 809 810 member_declaration_list: 811 member_declaration { 812 $$ = $1; 813 } 814 | member_declaration_list T_SEMI member_declaration { 815 $$ = lnklst($1, $3); 816 } 817 ; 818 819 member_declaration: 820 noclass_declmods deftyp { 821 /* too late, i know, but getsym() compensates it */ 822 symtyp = FMEMBER; 823 } notype_member_decls opt_type_attribute { 824 symtyp = FVFT; 825 $$ = $4; 826 } 827 | noclass_declspecs deftyp { 828 symtyp = FMEMBER; 829 } type_member_decls opt_type_attribute { 830 symtyp = FVFT; 831 $$ = $4; 832 } 833 | noclass_declmods deftyp opt_type_attribute { 834 symtyp = FVFT; 835 /* struct or union member must be named */ 836 if (!Sflag) 837 /* anonymous struct/union members is a C9X feature */ 838 warning(49); 839 /* add all the members of the anonymous struct/union */ 840 $$ = dcs->d_type->t_str->sou_first_member; 841 anonymize($$); 842 } 843 | noclass_declspecs deftyp opt_type_attribute { 844 symtyp = FVFT; 845 /* struct or union member must be named */ 846 if (!Sflag) 847 /* anonymous struct/union members is a C9X feature */ 848 warning(49); 849 if (is_struct_or_union(dcs->d_type->t_tspec)) { 850 $$ = dcs->d_type->t_str->sou_first_member; 851 /* add all the members of the anonymous struct/union */ 852 anonymize($$); 853 } else { 854 /* syntax error '%s' */ 855 error(249, "unnamed member"); 856 $$ = NULL; 857 } 858 } 859 | error { 860 symtyp = FVFT; 861 $$ = NULL; 862 } 863 ; 864 865 noclass_declspecs: 866 clrtyp_typespec { 867 add_type($1); 868 } 869 | type_attribute noclass_declspecs 870 | noclass_declmods typespec { 871 add_type($2); 872 } 873 | noclass_declspecs T_QUAL { 874 add_qualifier($2); 875 } 876 | noclass_declspecs notype_typespec { 877 add_type($2); 878 } 879 | noclass_declspecs type_attribute 880 ; 881 882 noclass_declmods: 883 clrtyp T_QUAL { 884 add_qualifier($2); 885 } 886 | noclass_declmods T_QUAL { 887 add_qualifier($2); 888 } 889 ; 890 891 notype_member_decls: 892 notype_member_decl { 893 $$ = declarator_1_struct_union($1); 894 } 895 | notype_member_decls { 896 symtyp = FMEMBER; 897 } T_COMMA type_member_decl { 898 $$ = lnklst($1, declarator_1_struct_union($4)); 899 } 900 ; 901 902 type_member_decls: 903 type_member_decl { 904 $$ = declarator_1_struct_union($1); 905 } 906 | type_member_decls { 907 symtyp = FMEMBER; 908 } T_COMMA type_member_decl { 909 $$ = lnklst($1, declarator_1_struct_union($4)); 910 } 911 ; 912 913 notype_member_decl: 914 notype_decl { 915 $$ = $1; 916 } 917 | notype_decl T_COLON constant_expr { /* C99 6.7.2.1 */ 918 $$ = bitfield($1, to_int_constant($3, true)); 919 } 920 | { 921 symtyp = FVFT; 922 } T_COLON constant_expr { /* C99 6.7.2.1 */ 923 $$ = bitfield(NULL, to_int_constant($3, true)); 924 } 925 ; 926 927 type_member_decl: 928 type_decl { 929 $$ = $1; 930 } 931 | type_decl T_COLON constant_expr { 932 $$ = bitfield($1, to_int_constant($3, true)); 933 } 934 | { 935 symtyp = FVFT; 936 } T_COLON constant_expr { 937 $$ = bitfield(NULL, to_int_constant($3, true)); 938 } 939 ; 940 941 enum_spec: 942 enum enum_tag { 943 $$ = mktag($2, ENUM, false, false); 944 } 945 | enum enum_tag { 946 dcs->d_tagtyp = mktag($2, ENUM, true, false); 947 } enum_declaration { 948 $$ = complete_tag_enum(dcs->d_tagtyp, $4); 949 } 950 | enum { 951 dcs->d_tagtyp = mktag(NULL, ENUM, true, false); 952 } enum_declaration { 953 $$ = complete_tag_enum(dcs->d_tagtyp, $3); 954 } 955 | enum error { 956 symtyp = FVFT; 957 $$ = gettyp(INT); 958 } 959 ; 960 961 enum: 962 T_ENUM { 963 symtyp = FTAG; 964 begin_declaration_level(CTCONST); 965 } 966 ; 967 968 enum_tag: 969 identifier { 970 $$ = getsym($1); 971 } 972 ; 973 974 enum_declaration: 975 enum_decl_lbrace enums_with_opt_comma T_RBRACE { 976 $$ = $2; 977 } 978 ; 979 980 enum_decl_lbrace: 981 T_LBRACE { 982 symtyp = FVFT; 983 enumval = 0; 984 } 985 ; 986 987 enums_with_opt_comma: 988 enums { 989 $$ = $1; 990 } 991 | enums T_COMMA { 992 if (sflag) { 993 /* trailing ',' prohibited in enum declaration */ 994 error(54); 995 } else { 996 /* trailing ',' prohibited in enum declaration */ 997 c99ism(54); 998 } 999 $$ = $1; 1000 } 1001 ; 1002 1003 enums: 1004 enumerator { 1005 $$ = $1; 1006 } 1007 | enums T_COMMA enumerator { 1008 $$ = lnklst($1, $3); 1009 } 1010 | error { 1011 $$ = NULL; 1012 } 1013 ; 1014 1015 enumerator: 1016 enumeration_constant { 1017 $$ = enumeration_constant($1, enumval, true); 1018 } 1019 | enumeration_constant T_ASSIGN constant_expr { 1020 $$ = enumeration_constant($1, to_int_constant($3, true), false); 1021 } 1022 ; 1023 1024 enumeration_constant: /* C99 6.4.4.3 */ 1025 identifier { 1026 $$ = getsym($1); 1027 } 1028 ; 1029 1030 1031 notype_init_decls: 1032 notype_init_decl 1033 | notype_init_decls T_COMMA type_init_decl 1034 ; 1035 1036 type_init_decls: 1037 type_init_decl 1038 | type_init_decls T_COMMA type_init_decl 1039 ; 1040 1041 notype_init_decl: 1042 notype_decl opt_asm_or_symbolrename { 1043 cgram_declare($1, false, $2); 1044 check_size($1); 1045 } 1046 | notype_decl opt_asm_or_symbolrename { 1047 begin_initialization($1); 1048 cgram_declare($1, true, $2); 1049 } T_ASSIGN initializer { 1050 check_size($1); 1051 end_initialization(); 1052 } 1053 ; 1054 1055 type_init_decl: 1056 type_decl opt_asm_or_symbolrename { 1057 cgram_declare($1, false, $2); 1058 check_size($1); 1059 } 1060 | type_decl opt_asm_or_symbolrename { 1061 begin_initialization($1); 1062 cgram_declare($1, true, $2); 1063 } T_ASSIGN initializer { 1064 check_size($1); 1065 end_initialization(); 1066 } 1067 ; 1068 1069 notype_decl: 1070 notype_direct_decl { 1071 $$ = $1; 1072 } 1073 | pointer notype_direct_decl { 1074 $$ = add_pointer($2, $1); 1075 } 1076 ; 1077 1078 type_decl: 1079 type_direct_decl { 1080 $$ = $1; 1081 } 1082 | pointer type_direct_decl { 1083 $$ = add_pointer($2, $1); 1084 } 1085 ; 1086 1087 notype_direct_decl: 1088 T_NAME { 1089 $$ = declarator_name(getsym($1)); 1090 } 1091 | T_LPAREN type_decl T_RPAREN { 1092 $$ = $2; 1093 } 1094 | type_attribute notype_direct_decl { 1095 $$ = $2; 1096 } 1097 | notype_direct_decl T_LBRACK T_RBRACK { 1098 $$ = add_array($1, false, 0); 1099 } 1100 | notype_direct_decl T_LBRACK array_size T_RBRACK { 1101 $$ = add_array($1, true, to_int_constant($3, false)); 1102 } 1103 | notype_direct_decl param_list opt_asm_or_symbolrename { 1104 $$ = add_function(symbolrename($1, $3), $2); 1105 end_declaration_level(); 1106 block_level--; 1107 } 1108 | notype_direct_decl type_attribute_list 1109 /* TODO: either add { $$ = $1 } everywhere or remove it everywhere. */ 1110 ; 1111 1112 /* 1113 * TODO: document whether the subtle difference between 'identifier' here and 1114 * 'T_NAME' in notype_direct_decl above is on purpose. 1115 */ 1116 type_direct_decl: 1117 identifier { 1118 $$ = declarator_name(getsym($1)); 1119 } 1120 | T_LPAREN type_decl T_RPAREN { 1121 $$ = $2; 1122 } 1123 | type_attribute type_direct_decl { 1124 $$ = $2; 1125 } 1126 | type_direct_decl T_LBRACK T_RBRACK { 1127 $$ = add_array($1, false, 0); 1128 } 1129 | type_direct_decl T_LBRACK array_size T_RBRACK { 1130 $$ = add_array($1, true, to_int_constant($3, false)); 1131 } 1132 | type_direct_decl param_list opt_asm_or_symbolrename { 1133 $$ = add_function(symbolrename($1, $3), $2); 1134 end_declaration_level(); 1135 block_level--; 1136 } 1137 | type_direct_decl type_attribute_list 1138 ; 1139 1140 /* 1141 * param_decl and notype_param_decl exist to avoid a conflict in 1142 * argument lists. A typename enclosed in parens should always be 1143 * treated as a typename, not an argument. 1144 * "typedef int a; f(int (a));" is "typedef int a; f(int foo(a));" 1145 * not "typedef int a; f(int a);" 1146 */ 1147 param_decl: 1148 direct_param_decl { 1149 $$ = $1; 1150 } 1151 | pointer direct_param_decl { 1152 $$ = add_pointer($2, $1); 1153 } 1154 ; 1155 1156 /* TODO: consistently use 'opt' either as prefix or as suffix */ 1157 opt_type_qualifier_list: 1158 /* empty */ 1159 | type_qualifier_list 1160 ; 1161 1162 array_size: 1163 opt_type_qualifier_list T_SCLASS constant_expr { 1164 /* C11 6.7.6.3p7 */ 1165 if ($2 != STATIC) 1166 yyerror("Bad attribute"); 1167 /* static array size is a C11 extension */ 1168 c11ism(343); 1169 $$ = $3; 1170 } 1171 | constant_expr { 1172 $$ = $1; 1173 } 1174 ; 1175 1176 direct_param_decl: 1177 identifier type_attribute_list { 1178 $$ = declarator_name(getsym($1)); 1179 } 1180 | identifier { 1181 $$ = declarator_name(getsym($1)); 1182 } 1183 | T_LPAREN notype_param_decl T_RPAREN { 1184 $$ = $2; 1185 } 1186 | direct_param_decl T_LBRACK T_RBRACK { 1187 $$ = add_array($1, false, 0); 1188 } 1189 | direct_param_decl T_LBRACK array_size T_RBRACK { 1190 $$ = add_array($1, true, to_int_constant($3, false)); 1191 } 1192 | direct_param_decl param_list opt_asm_or_symbolrename { 1193 $$ = add_function(symbolrename($1, $3), $2); 1194 end_declaration_level(); 1195 block_level--; 1196 } 1197 ; 1198 1199 notype_param_decl: 1200 direct_notype_param_decl { 1201 $$ = $1; 1202 } 1203 | pointer direct_notype_param_decl { 1204 $$ = add_pointer($2, $1); 1205 } 1206 ; 1207 1208 direct_notype_param_decl: 1209 identifier { 1210 $$ = declarator_name(getsym($1)); 1211 } 1212 | T_LPAREN notype_param_decl T_RPAREN { 1213 $$ = $2; 1214 } 1215 | direct_notype_param_decl T_LBRACK T_RBRACK { 1216 $$ = add_array($1, false, 0); 1217 } 1218 | direct_notype_param_decl T_LBRACK array_size T_RBRACK { 1219 $$ = add_array($1, true, to_int_constant($3, false)); 1220 } 1221 | direct_notype_param_decl param_list opt_asm_or_symbolrename { 1222 $$ = add_function(symbolrename($1, $3), $2); 1223 end_declaration_level(); 1224 block_level--; 1225 } 1226 ; 1227 1228 /* TODO: rename 'pointer' to something less ambiguous, maybe 'pointer_level' */ 1229 pointer: 1230 asterisk { 1231 $$ = $1; 1232 } 1233 | asterisk type_qualifier_list { 1234 /* TODO: rename pqinf_t to be more expressive */ 1235 /* TODO: then rename the merge function */ 1236 $$ = merge_pointers_and_qualifiers($1, $2); 1237 } 1238 | asterisk pointer { 1239 $$ = merge_pointers_and_qualifiers($1, $2); 1240 } 1241 | asterisk type_qualifier_list pointer { 1242 $$ = merge_pointers_and_qualifiers($1, $2); 1243 $$ = merge_pointers_and_qualifiers($$, $3); 1244 } 1245 ; 1246 1247 asterisk: 1248 T_ASTERISK { 1249 $$ = xcalloc(1, sizeof(*$$)); 1250 $$->p_pointer = true; 1251 } 1252 ; 1253 1254 /* TODO: try whether type_qualifier_list_opt makes the code simpler */ 1255 type_qualifier_list: 1256 type_qualifier { 1257 $$ = $1; 1258 } 1259 | type_qualifier_list type_qualifier { 1260 $$ = merge_pointers_and_qualifiers($1, $2); 1261 } 1262 ; 1263 1264 type_qualifier: 1265 T_QUAL { 1266 $$ = xcalloc(1, sizeof(*$$)); 1267 if ($1 == CONST) { 1268 $$->p_const = true; 1269 } else if ($1 == VOLATILE) { 1270 $$->p_volatile = true; 1271 } else { 1272 lint_assert($1 == RESTRICT || $1 == THREAD); 1273 } 1274 } 1275 ; 1276 1277 param_list: 1278 id_list_lparen identifier_list T_RPAREN { 1279 $$ = $2; 1280 } 1281 | abstract_decl_param_list { 1282 $$ = $1; 1283 } 1284 ; 1285 1286 id_list_lparen: 1287 T_LPAREN { 1288 block_level++; 1289 begin_declaration_level(PROTO_ARG); 1290 } 1291 ; 1292 1293 identifier_list: 1294 T_NAME { 1295 $$ = old_style_function_name(getsym($1)); 1296 } 1297 | identifier_list T_COMMA T_NAME { 1298 $$ = lnklst($1, old_style_function_name(getsym($3))); 1299 } 1300 | identifier_list error { 1301 $$ = $1; 1302 } 1303 ; 1304 1305 abstract_decl_param_list: 1306 abstract_decl_lparen T_RPAREN opt_type_attribute { 1307 $$ = NULL; 1308 } 1309 | abstract_decl_lparen vararg_parameter_type_list T_RPAREN opt_type_attribute { 1310 dcs->d_proto = true; 1311 $$ = $2; 1312 } 1313 | abstract_decl_lparen error T_RPAREN opt_type_attribute { 1314 $$ = NULL; 1315 } 1316 ; 1317 1318 abstract_decl_lparen: 1319 T_LPAREN { 1320 block_level++; 1321 begin_declaration_level(PROTO_ARG); 1322 } 1323 ; 1324 1325 vararg_parameter_type_list: 1326 parameter_type_list { 1327 $$ = $1; 1328 } 1329 | parameter_type_list T_COMMA T_ELLIPSIS { 1330 dcs->d_vararg = true; 1331 $$ = $1; 1332 } 1333 | T_ELLIPSIS { 1334 if (sflag) { 1335 /* ANSI C requires formal parameter before '...' */ 1336 error(84); 1337 } else if (!tflag) { 1338 /* ANSI C requires formal parameter before '...' */ 1339 warning(84); 1340 } 1341 dcs->d_vararg = true; 1342 $$ = NULL; 1343 } 1344 ; 1345 1346 parameter_type_list: 1347 parameter_declaration { 1348 $$ = $1; 1349 } 1350 | parameter_type_list T_COMMA parameter_declaration { 1351 $$ = lnklst($1, $3); 1352 } 1353 ; 1354 1355 parameter_declaration: 1356 declmods deftyp { 1357 $$ = declare_argument(abstract_name(), false); 1358 } 1359 | declaration_specifiers deftyp { 1360 $$ = declare_argument(abstract_name(), false); 1361 } 1362 | declmods deftyp notype_param_decl { 1363 $$ = declare_argument($3, false); 1364 } 1365 /* 1366 * param_decl is needed because of following conflict: 1367 * "typedef int a; f(int (a));" could be parsed as 1368 * "function with argument a of type int", or 1369 * "function with an abstract argument of type function". 1370 * This grammar realizes the second case. 1371 */ 1372 | declaration_specifiers deftyp param_decl { 1373 $$ = declare_argument($3, false); 1374 } 1375 | declmods deftyp abstract_decl { 1376 $$ = declare_argument($3, false); 1377 } 1378 | declaration_specifiers deftyp abstract_decl { 1379 $$ = declare_argument($3, false); 1380 } 1381 ; 1382 1383 opt_asm_or_symbolrename: /* expect only one */ 1384 /* empty */ { 1385 $$ = NULL; 1386 } 1387 | T_ASM T_LPAREN T_STRING T_RPAREN { 1388 freeyyv(&$3, T_STRING); 1389 $$ = NULL; 1390 } 1391 | T_SYMBOLRENAME T_LPAREN T_NAME T_RPAREN { 1392 $$ = $3; 1393 } 1394 ; 1395 1396 initializer: /* C99 6.7.8 "Initialization" */ 1397 expr %prec T_COMMA { 1398 init_expr($1); 1399 } 1400 | init_lbrace init_rbrace { 1401 /* XXX: Empty braces are not covered by C99 6.7.8. */ 1402 } 1403 | init_lbrace initializer_list comma_opt init_rbrace 1404 | error 1405 ; 1406 1407 initializer_list: /* C99 6.7.8 "Initialization" */ 1408 initializer_list_item 1409 | initializer_list T_COMMA initializer_list_item 1410 ; 1411 1412 initializer_list_item: 1413 designation initializer 1414 | initializer 1415 ; 1416 1417 designation: /* C99 6.7.8 "Initialization" */ 1418 designator_list T_ASSIGN 1419 | identifier T_COLON { 1420 /* GCC style struct or union member name in initializer */ 1421 gnuism(315); 1422 add_designator_member($1); 1423 } 1424 ; 1425 1426 designator_list: /* C99 6.7.8 "Initialization" */ 1427 designator 1428 | designator_list designator 1429 ; 1430 1431 designator: /* C99 6.7.8 "Initialization" */ 1432 T_LBRACK range T_RBRACK { 1433 add_designator_subscript($2); 1434 if (!Sflag) 1435 /* array initializer with des.s is a C9X feature */ 1436 warning(321); 1437 } 1438 | T_POINT identifier { 1439 if (!Sflag) 1440 /* struct or union member name in initializer is ... */ 1441 warning(313); 1442 add_designator_member($2); 1443 } 1444 ; 1445 1446 range: 1447 constant_expr { 1448 $$.lo = to_int_constant($1, true); 1449 $$.hi = $$.lo; 1450 } 1451 | constant_expr T_ELLIPSIS constant_expr { 1452 $$.lo = to_int_constant($1, true); 1453 $$.hi = to_int_constant($3, true); 1454 /* initialization with '[a...b]' is a GNU extension */ 1455 gnuism(340); 1456 } 1457 ; 1458 1459 init_lbrace: 1460 T_LBRACE { 1461 init_lbrace(); 1462 } 1463 ; 1464 1465 init_rbrace: 1466 T_RBRACE { 1467 init_rbrace(); 1468 } 1469 ; 1470 1471 type_name: 1472 { 1473 begin_declaration_level(ABSTRACT); 1474 } abstract_declaration { 1475 end_declaration_level(); 1476 $$ = $2->s_type; 1477 } 1478 ; 1479 1480 abstract_declaration: 1481 noclass_declmods deftyp { 1482 $$ = declare_1_abstract(abstract_name()); 1483 } 1484 | noclass_declspecs deftyp { 1485 $$ = declare_1_abstract(abstract_name()); 1486 } 1487 | noclass_declmods deftyp abstract_decl { 1488 $$ = declare_1_abstract($3); 1489 } 1490 | noclass_declspecs deftyp abstract_decl { 1491 $$ = declare_1_abstract($3); 1492 } 1493 ; 1494 1495 /* TODO: abstract_declaration and abstract_decl sound too similar */ 1496 abstract_decl: 1497 pointer { 1498 $$ = add_pointer(abstract_name(), $1); 1499 } 1500 | direct_abstract_decl { 1501 $$ = $1; 1502 } 1503 | pointer direct_abstract_decl { 1504 $$ = add_pointer($2, $1); 1505 } 1506 | T_TYPEOF term { 1507 $$ = mktempsym($2->tn_type); 1508 } 1509 ; 1510 1511 direct_abstract_decl: 1512 T_LPAREN abstract_decl T_RPAREN { 1513 $$ = $2; 1514 } 1515 | T_LBRACK T_RBRACK { 1516 $$ = add_array(abstract_name(), false, 0); 1517 } 1518 | T_LBRACK array_size T_RBRACK { 1519 $$ = add_array(abstract_name(), true, to_int_constant($2, false)); 1520 } 1521 | type_attribute direct_abstract_decl { 1522 $$ = $2; 1523 } 1524 | direct_abstract_decl T_LBRACK T_RBRACK { 1525 $$ = add_array($1, false, 0); 1526 } 1527 | direct_abstract_decl T_LBRACK array_size T_RBRACK { 1528 $$ = add_array($1, true, to_int_constant($3, false)); 1529 } 1530 | abstract_decl_param_list opt_asm_or_symbolrename { 1531 $$ = add_function(symbolrename(abstract_name(), $2), $1); 1532 end_declaration_level(); 1533 block_level--; 1534 } 1535 | direct_abstract_decl abstract_decl_param_list opt_asm_or_symbolrename { 1536 $$ = add_function(symbolrename($1, $3), $2); 1537 end_declaration_level(); 1538 block_level--; 1539 } 1540 | direct_abstract_decl type_attribute_list 1541 ; 1542 1543 non_expr_statement: 1544 type_attribute T_SEMI 1545 | labeled_statement 1546 | compound_statement 1547 | selection_statement 1548 | iteration_statement 1549 | jump_statement { 1550 seen_fallthrough = false; 1551 } 1552 | asm_statement 1553 ; 1554 1555 statement: /* C99 6.8 */ 1556 expr_statement 1557 | non_expr_statement 1558 ; 1559 1560 labeled_statement: /* C99 6.8.1 */ 1561 label opt_type_attribute statement 1562 ; 1563 1564 label: 1565 T_NAME T_COLON { 1566 symtyp = FLABEL; 1567 named_label(getsym($1)); 1568 } 1569 | T_CASE constant_expr T_COLON { 1570 case_label($2); 1571 seen_fallthrough = true; 1572 } 1573 | T_CASE constant_expr T_ELLIPSIS constant_expr T_COLON { 1574 /* XXX: We don't fill all cases */ 1575 case_label($2); 1576 seen_fallthrough = true; 1577 } 1578 | T_DEFAULT T_COLON { 1579 default_label(); 1580 seen_fallthrough = true; 1581 } 1582 ; 1583 1584 compound_statement: /* C99 6.8.2 */ 1585 compound_statement_lbrace compound_statement_rbrace 1586 | compound_statement_lbrace block_item_list compound_statement_rbrace 1587 ; 1588 1589 compound_statement_lbrace: 1590 T_LBRACE { 1591 block_level++; 1592 mem_block_level++; 1593 begin_declaration_level(AUTO); 1594 } 1595 ; 1596 1597 compound_statement_rbrace: 1598 T_RBRACE { 1599 end_declaration_level(); 1600 freeblk(); 1601 mem_block_level--; 1602 block_level--; 1603 seen_fallthrough = false; 1604 } 1605 ; 1606 1607 block_item_list: 1608 block_item 1609 | block_item_list block_item { 1610 if (!Sflag && $1 && !$2) 1611 /* declarations after statements is a C99 feature */ 1612 c99ism(327); 1613 $$ = $1 || $2; 1614 } 1615 ; 1616 1617 block_item: 1618 statement { 1619 $$ = true; 1620 restore_warning_flags(); 1621 } 1622 | declaration { 1623 $$ = false; 1624 restore_warning_flags(); 1625 } 1626 ; 1627 1628 expr_statement: 1629 expr T_SEMI { 1630 expr($1, false, false, false, false); 1631 seen_fallthrough = false; 1632 } 1633 | T_SEMI { 1634 seen_fallthrough = false; 1635 } 1636 ; 1637 1638 selection_statement: /* C99 6.8.4 */ 1639 if_without_else { 1640 save_warning_flags(); 1641 if2(); 1642 if3(false); 1643 } 1644 | if_without_else T_ELSE { 1645 save_warning_flags(); 1646 if2(); 1647 } statement { 1648 clear_warning_flags(); 1649 if3(true); 1650 } 1651 | if_without_else T_ELSE error { 1652 clear_warning_flags(); 1653 if3(false); 1654 } 1655 | switch_expr statement { 1656 clear_warning_flags(); 1657 switch2(); 1658 } 1659 | switch_expr error { 1660 clear_warning_flags(); 1661 switch2(); 1662 } 1663 ; 1664 1665 if_without_else: 1666 if_expr statement 1667 | if_expr error 1668 ; 1669 1670 if_expr: 1671 T_IF T_LPAREN expr T_RPAREN { 1672 if1($3); 1673 clear_warning_flags(); 1674 } 1675 ; 1676 1677 switch_expr: 1678 T_SWITCH T_LPAREN expr T_RPAREN { 1679 switch1($3); 1680 clear_warning_flags(); 1681 } 1682 ; 1683 1684 generic_selection: /* C11 6.5.1.1 */ 1685 T_GENERIC T_LPAREN assignment_expression T_COMMA 1686 generic_assoc_list T_RPAREN { 1687 /* generic selection requires C11 or later */ 1688 c11ism(345); 1689 $$ = build_generic_selection($3, $5); 1690 } 1691 ; 1692 1693 generic_assoc_list: /* C11 6.5.1.1 */ 1694 generic_association 1695 | generic_assoc_list T_COMMA generic_association { 1696 $3->gat_prev = $1; 1697 $$ = $3; 1698 } 1699 ; 1700 1701 generic_association: /* C11 6.5.1.1 */ 1702 type_name T_COLON expr { 1703 $$ = getblk(sizeof(*$$)); 1704 $$->gat_arg = $1; 1705 $$->gat_result = $3; 1706 } 1707 | T_DEFAULT T_COLON expr { 1708 $$ = getblk(sizeof(*$$)); 1709 $$->gat_arg = NULL; 1710 $$->gat_result = $3; 1711 } 1712 ; 1713 1714 do_statement: /* C99 6.8.5 */ 1715 do statement { 1716 clear_warning_flags(); 1717 } 1718 ; 1719 1720 iteration_statement: /* C99 6.8.5 */ 1721 while_expr statement { 1722 clear_warning_flags(); 1723 while2(); 1724 } 1725 | while_expr error { 1726 clear_warning_flags(); 1727 while2(); 1728 } 1729 | do_statement do_while_expr { 1730 do2($2); 1731 seen_fallthrough = false; 1732 } 1733 | do error { 1734 clear_warning_flags(); 1735 do2(NULL); 1736 } 1737 | for_exprs statement { 1738 clear_warning_flags(); 1739 for2(); 1740 end_declaration_level(); 1741 block_level--; 1742 } 1743 | for_exprs error { 1744 clear_warning_flags(); 1745 for2(); 1746 end_declaration_level(); 1747 block_level--; 1748 } 1749 ; 1750 1751 while_expr: 1752 T_WHILE T_LPAREN expr T_RPAREN { 1753 while1($3); 1754 clear_warning_flags(); 1755 } 1756 ; 1757 1758 do: 1759 T_DO { 1760 do1(); 1761 } 1762 ; 1763 1764 do_while_expr: 1765 T_WHILE T_LPAREN expr T_RPAREN T_SEMI { 1766 $$ = $3; 1767 } 1768 ; 1769 1770 for_start: 1771 T_FOR T_LPAREN { 1772 begin_declaration_level(AUTO); 1773 block_level++; 1774 } 1775 ; 1776 for_exprs: 1777 for_start declaration_specifiers deftyp notype_init_decls T_SEMI 1778 opt_expr T_SEMI opt_expr T_RPAREN { 1779 /* variable declaration in for loop */ 1780 c99ism(325); 1781 for1(NULL, $6, $8); 1782 clear_warning_flags(); 1783 } 1784 | for_start opt_expr T_SEMI opt_expr T_SEMI opt_expr T_RPAREN { 1785 for1($2, $4, $6); 1786 clear_warning_flags(); 1787 } 1788 ; 1789 1790 opt_expr: 1791 /* empty */ { 1792 $$ = NULL; 1793 } 1794 | expr { 1795 $$ = $1; 1796 } 1797 ; 1798 1799 jump_statement: /* C99 6.8.6 */ 1800 goto identifier T_SEMI { 1801 do_goto(getsym($2)); 1802 } 1803 | goto error T_SEMI { 1804 symtyp = FVFT; 1805 } 1806 | T_CONTINUE T_SEMI { 1807 do_continue(); 1808 } 1809 | T_BREAK T_SEMI { 1810 do_break(); 1811 } 1812 | T_RETURN T_SEMI { 1813 do_return(NULL); 1814 } 1815 | T_RETURN expr T_SEMI { 1816 do_return($2); 1817 } 1818 ; 1819 1820 goto: 1821 T_GOTO { 1822 symtyp = FLABEL; 1823 } 1824 ; 1825 1826 asm_statement: 1827 T_ASM T_LPAREN read_until_rparen T_SEMI { 1828 setasm(); 1829 } 1830 | T_ASM T_QUAL T_LPAREN read_until_rparen T_SEMI { 1831 setasm(); 1832 } 1833 | T_ASM error 1834 ; 1835 1836 read_until_rparen: 1837 /* empty */ { 1838 ignore_up_to_rparen(); 1839 } 1840 ; 1841 1842 constant_expr_list_opt: 1843 /* empty */ 1844 | constant_expr_list 1845 ; 1846 1847 constant_expr_list: 1848 constant_expr 1849 | constant_expr_list T_COMMA constant_expr 1850 ; 1851 1852 constant_expr: /* C99 6.6 */ 1853 expr %prec T_ASSIGN { 1854 $$ = $1; 1855 } 1856 ; 1857 1858 expr: 1859 expr T_ASTERISK expr { 1860 $$ = build(MULT, $1, $3); 1861 } 1862 | expr T_MULTIPLICATIVE expr { 1863 $$ = build($2, $1, $3); 1864 } 1865 | expr T_ADDITIVE expr { 1866 $$ = build($2, $1, $3); 1867 } 1868 | expr T_SHIFT expr { 1869 $$ = build($2, $1, $3); 1870 } 1871 | expr T_RELATIONAL expr { 1872 $$ = build($2, $1, $3); 1873 } 1874 | expr T_EQUALITY expr { 1875 $$ = build($2, $1, $3); 1876 } 1877 | expr T_AMPER expr { 1878 $$ = build(BITAND, $1, $3); 1879 } 1880 | expr T_BITXOR expr { 1881 $$ = build(BITXOR, $1, $3); 1882 } 1883 | expr T_BITOR expr { 1884 $$ = build(BITOR, $1, $3); 1885 } 1886 | expr T_LOGAND expr { 1887 $$ = build(LOGAND, $1, $3); 1888 } 1889 | expr T_LOGOR expr { 1890 $$ = build(LOGOR, $1, $3); 1891 } 1892 | expr T_QUEST expr T_COLON expr { 1893 $$ = build(QUEST, $1, build(COLON, $3, $5)); 1894 } 1895 | expr T_ASSIGN expr { 1896 $$ = build(ASSIGN, $1, $3); 1897 } 1898 | expr T_OPASSIGN expr { 1899 $$ = build($2, $1, $3); 1900 } 1901 | expr T_COMMA expr { 1902 $$ = build(COMMA, $1, $3); 1903 } 1904 | term { 1905 $$ = $1; 1906 } 1907 | generic_selection { 1908 $$ = $1; 1909 } 1910 ; 1911 1912 assignment_expression: /* C99 6.5.16 */ 1913 expr %prec T_ASSIGN 1914 ; 1915 1916 term: 1917 T_NAME { 1918 /* XXX really necessary? */ 1919 if (yychar < 0) 1920 yychar = yylex(); 1921 $$ = new_name_node(getsym($1), yychar); 1922 } 1923 | string { 1924 $$ = new_string_node($1); 1925 } 1926 | T_CON { 1927 $$ = expr_new_constant(gettyp($1->v_tspec), $1); 1928 } 1929 | T_LPAREN expr T_RPAREN { 1930 if ($2 != NULL) 1931 $2->tn_parenthesized = true; 1932 $$ = $2; 1933 } 1934 | T_LPAREN compound_statement_lbrace gcc_statement_expr_list { 1935 block_level--; 1936 mem_block_level--; 1937 begin_initialization(mktempsym(dup_type($3->tn_type))); 1938 mem_block_level++; 1939 block_level++; 1940 /* ({ }) is a GCC extension */ 1941 gnuism(320); 1942 } compound_statement_rbrace T_RPAREN { 1943 $$ = new_name_node(*current_initsym(), 0); 1944 end_initialization(); 1945 } 1946 | term T_INCDEC { 1947 $$ = build($2 == INC ? INCAFT : DECAFT, $1, NULL); 1948 } 1949 | T_INCDEC term { 1950 $$ = build($1 == INC ? INCBEF : DECBEF, $2, NULL); 1951 } 1952 | T_ASTERISK term { 1953 $$ = build(INDIR, $2, NULL); 1954 } 1955 | T_AMPER term { 1956 $$ = build(ADDR, $2, NULL); 1957 } 1958 | T_UNARY term { 1959 $$ = build($1, $2, NULL); 1960 } 1961 | T_ADDITIVE term { 1962 if (tflag && $1 == PLUS) { 1963 /* unary + is illegal in traditional C */ 1964 warning(100); 1965 } 1966 $$ = build($1 == PLUS ? UPLUS : UMINUS, $2, NULL); 1967 } 1968 | term T_LBRACK expr T_RBRACK { 1969 $$ = build(INDIR, build(PLUS, $1, $3), NULL); 1970 } 1971 | term T_LPAREN T_RPAREN { 1972 $$ = new_function_call_node($1, NULL); 1973 } 1974 | term T_LPAREN func_arg_list T_RPAREN { 1975 $$ = new_function_call_node($1, $3); 1976 } 1977 | term point_or_arrow T_NAME { 1978 if ($1 != NULL) { 1979 sym_t *msym; 1980 /* 1981 * XXX struct_or_union_member should be integrated 1982 * in build() 1983 */ 1984 if ($2 == ARROW) { 1985 /* 1986 * must do this before struct_or_union_member 1987 * is called 1988 */ 1989 $1 = cconv($1); 1990 } 1991 msym = struct_or_union_member($1, $2, getsym($3)); 1992 $$ = build($2, $1, new_name_node(msym, 0)); 1993 } else { 1994 $$ = NULL; 1995 } 1996 } 1997 | T_REAL term { 1998 $$ = build(REAL, $2, NULL); 1999 } 2000 | T_IMAG term { 2001 $$ = build(IMAG, $2, NULL); 2002 } 2003 | T_EXTENSION term { 2004 $$ = $2; 2005 } 2006 | T_REAL T_LPAREN term T_RPAREN { 2007 $$ = build(REAL, $3, NULL); 2008 } 2009 | T_IMAG T_LPAREN term T_RPAREN { 2010 $$ = build(IMAG, $3, NULL); 2011 } 2012 | T_BUILTIN_OFFSETOF T_LPAREN type_name T_COMMA identifier T_RPAREN { 2013 symtyp = FMEMBER; 2014 $$ = build_offsetof($3, getsym($5)); 2015 } 2016 | T_SIZEOF term { 2017 $$ = $2 == NULL ? NULL : build_sizeof($2->tn_type); 2018 if ($$ != NULL) 2019 check_expr_misc($2, false, false, false, false, false, true); 2020 } 2021 | T_SIZEOF T_LPAREN type_name T_RPAREN %prec T_SIZEOF { 2022 $$ = build_sizeof($3); 2023 } 2024 | T_ALIGNOF T_LPAREN type_name T_RPAREN { 2025 $$ = build_alignof($3); 2026 } 2027 | T_LPAREN type_name T_RPAREN term %prec T_UNARY { 2028 $$ = cast($4, $2); 2029 } 2030 | T_LPAREN type_name T_RPAREN { /* C99 6.5.2.5 "Compound literals" */ 2031 sym_t *tmp = mktempsym($2); 2032 begin_initialization(tmp); 2033 cgram_declare(tmp, true, NULL); 2034 } init_lbrace initializer_list comma_opt init_rbrace { 2035 if (!Sflag) 2036 /* compound literals are a C9X/GCC extension */ 2037 gnuism(319); 2038 $$ = new_name_node(*current_initsym(), 0); 2039 end_initialization(); 2040 } 2041 ; 2042 2043 /* 2044 * The inner part of a GCC statement-expression of the form ({ ... }). 2045 * 2046 * https://gcc.gnu.org/onlinedocs/gcc/Statement-Exprs.html 2047 */ 2048 gcc_statement_expr_list: 2049 gcc_statement_expr_item 2050 | gcc_statement_expr_list gcc_statement_expr_item { 2051 $$ = $2; 2052 } 2053 ; 2054 2055 gcc_statement_expr_item: 2056 declaration { 2057 clear_warning_flags(); 2058 $$ = NULL; 2059 } 2060 | non_expr_statement { 2061 $$ = expr_zalloc_tnode(); 2062 $$->tn_type = gettyp(VOID); 2063 } 2064 | expr T_SEMI { 2065 if ($1 == NULL) { /* in case of syntax errors */ 2066 $$ = expr_zalloc_tnode(); 2067 $$->tn_type = gettyp(VOID); 2068 } else { 2069 /* XXX: do that only on the last name */ 2070 if ($1->tn_op == NAME) 2071 $1->tn_sym->s_used = true; 2072 $$ = $1; 2073 expr($1, false, false, false, false); 2074 seen_fallthrough = false; 2075 } 2076 } 2077 ; 2078 2079 string: 2080 T_STRING { 2081 $$ = $1; 2082 } 2083 | T_STRING string2 { 2084 $$ = cat_strings($1, $2); 2085 } 2086 ; 2087 2088 string2: 2089 T_STRING { 2090 if (tflag) { 2091 /* concatenated strings are illegal in traditional C */ 2092 warning(219); 2093 } 2094 $$ = $1; 2095 } 2096 | string2 T_STRING { 2097 $$ = cat_strings($1, $2); 2098 } 2099 ; 2100 2101 func_arg_list: 2102 expr %prec T_COMMA { 2103 $$ = new_function_argument_node(NULL, $1); 2104 } 2105 | func_arg_list T_COMMA expr { 2106 $$ = new_function_argument_node($1, $3); 2107 } 2108 ; 2109 2110 point_or_arrow: 2111 T_POINT { 2112 symtyp = FMEMBER; 2113 $$ = POINT; 2114 } 2115 | T_ARROW { 2116 symtyp = FMEMBER; 2117 $$ = ARROW; 2118 } 2119 ; 2120 2121 identifier: /* C99 6.4.2.1 */ 2122 T_NAME { 2123 $$ = $1; 2124 cgram_debug("name '%s'", $$->sb_name); 2125 } 2126 | T_TYPENAME { 2127 $$ = $1; 2128 cgram_debug("typename '%s'", $$->sb_name); 2129 } 2130 ; 2131 2132 comma_opt: 2133 T_COMMA 2134 | /* empty */ 2135 ; 2136 %% 2137 2138 /* ARGSUSED */ 2139 int 2140 yyerror(const char *msg) 2141 { 2142 /* syntax error '%s' */ 2143 error(249, yytext); 2144 if (++sytxerr >= 5) 2145 norecover(); 2146 return 0; 2147 } 2148 2149 static void 2150 cgram_declare(sym_t *decl, bool initflg, sbuf_t *renaming) 2151 { 2152 declare(decl, initflg, renaming); 2153 if (renaming != NULL) 2154 freeyyv(&renaming, T_NAME); 2155 } 2156 2157 /* 2158 * Discard all input tokens up to and including the next 2159 * unmatched right paren 2160 */ 2161 static void 2162 ignore_up_to_rparen(void) 2163 { 2164 int level; 2165 2166 if (yychar < 0) 2167 yychar = yylex(); 2168 freeyyv(&yylval, yychar); 2169 2170 level = 1; 2171 while (yychar != T_RPAREN || --level > 0) { 2172 if (yychar == T_LPAREN) { 2173 level++; 2174 } else if (yychar <= 0) { 2175 break; 2176 } 2177 freeyyv(&yylval, yychar = yylex()); 2178 } 2179 2180 yyclearin; 2181 } 2182 2183 static sym_t * 2184 symbolrename(sym_t *s, sbuf_t *sb) 2185 { 2186 if (sb != NULL) 2187 s->s_rename = sb->sb_name; 2188 return s; 2189 } 2190
Indexes created Fri Oct 03 02:09:57 GMT 2025