cgram.y revision 1.238
1 %{ 2 /* $NetBSD: cgram.y,v 1.238 2021/06/27 21:30:46 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 1.238 2021/06/27 21:30:46 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 $$ = add_pointer($2, $1); 1075 } 1076 ; 1077 1078 /* TODO: move below type_decl */ 1079 notype_direct_decl: 1080 T_NAME { 1081 $$ = declarator_name(getsym($1)); 1082 } 1083 | T_LPAREN type_decl T_RPAREN { 1084 $$ = $2; 1085 } 1086 | type_attribute notype_direct_decl { 1087 $$ = $2; 1088 } 1089 | notype_direct_decl T_LBRACK T_RBRACK { 1090 $$ = add_array($1, false, 0); 1091 } 1092 | notype_direct_decl T_LBRACK array_size T_RBRACK { 1093 $$ = add_array($1, true, to_int_constant($3, false)); 1094 } 1095 | notype_direct_decl param_list opt_asm_or_symbolrename { 1096 $$ = add_function(symbolrename($1, $3), $2); 1097 end_declaration_level(); 1098 block_level--; 1099 } 1100 | notype_direct_decl type_attribute_list 1101 /* TODO: either add { $$ = $1 } everywhere or remove it everywhere. */ 1102 ; 1103 1104 type_decl: 1105 type_direct_decl { 1106 $$ = $1; 1107 } 1108 | pointer type_direct_decl { 1109 $$ = add_pointer($2, $1); 1110 } 1111 ; 1112 1113 /* 1114 * TODO: document whether T_NAME here vs. identifier in notype_direct_decl 1115 * is on purpose. 1116 */ 1117 type_direct_decl: 1118 identifier { 1119 $$ = declarator_name(getsym($1)); 1120 } 1121 | T_LPAREN type_decl T_RPAREN { 1122 $$ = $2; 1123 } 1124 | type_attribute type_direct_decl { 1125 $$ = $2; 1126 } 1127 | type_direct_decl T_LBRACK T_RBRACK { 1128 $$ = add_array($1, false, 0); 1129 } 1130 | type_direct_decl T_LBRACK array_size T_RBRACK { 1131 $$ = add_array($1, true, to_int_constant($3, false)); 1132 } 1133 | type_direct_decl param_list opt_asm_or_symbolrename { 1134 $$ = add_function(symbolrename($1, $3), $2); 1135 end_declaration_level(); 1136 block_level--; 1137 } 1138 | type_direct_decl type_attribute_list 1139 ; 1140 1141 /* 1142 * param_decl and notype_param_decl exist to avoid a conflict in 1143 * argument lists. A typename enclosed in parens should always be 1144 * treated as a typename, not an argument. 1145 * "typedef int a; f(int (a));" is "typedef int a; f(int foo(a));" 1146 * not "typedef int a; f(int a);" 1147 */ 1148 param_decl: 1149 direct_param_decl { 1150 $$ = $1; 1151 } 1152 | pointer direct_param_decl { 1153 $$ = add_pointer($2, $1); 1154 } 1155 ; 1156 1157 /* TODO: consistently use 'opt' either as prefix or as suffix */ 1158 opt_type_qualifier_list: 1159 /* empty */ 1160 | type_qualifier_list 1161 ; 1162 1163 array_size: 1164 opt_type_qualifier_list T_SCLASS constant_expr { 1165 /* C11 6.7.6.3p7 */ 1166 if ($2 != STATIC) 1167 yyerror("Bad attribute"); 1168 /* static array size is a C11 extension */ 1169 c11ism(343); 1170 $$ = $3; 1171 } 1172 | constant_expr { 1173 $$ = $1; 1174 } 1175 ; 1176 1177 direct_param_decl: 1178 identifier type_attribute_list { 1179 $$ = declarator_name(getsym($1)); 1180 } 1181 | identifier { 1182 $$ = declarator_name(getsym($1)); 1183 } 1184 | T_LPAREN notype_param_decl T_RPAREN { 1185 $$ = $2; 1186 } 1187 | direct_param_decl T_LBRACK T_RBRACK { 1188 $$ = add_array($1, false, 0); 1189 } 1190 | direct_param_decl T_LBRACK array_size T_RBRACK { 1191 $$ = add_array($1, true, to_int_constant($3, false)); 1192 } 1193 | direct_param_decl param_list opt_asm_or_symbolrename { 1194 $$ = add_function(symbolrename($1, $3), $2); 1195 end_declaration_level(); 1196 block_level--; 1197 } 1198 ; 1199 1200 notype_param_decl: 1201 direct_notype_param_decl { 1202 $$ = $1; 1203 } 1204 | pointer direct_notype_param_decl { 1205 $$ = add_pointer($2, $1); 1206 } 1207 ; 1208 1209 direct_notype_param_decl: 1210 identifier { 1211 $$ = declarator_name(getsym($1)); 1212 } 1213 | T_LPAREN notype_param_decl T_RPAREN { 1214 $$ = $2; 1215 } 1216 | direct_notype_param_decl T_LBRACK T_RBRACK { 1217 $$ = add_array($1, false, 0); 1218 } 1219 | direct_notype_param_decl T_LBRACK array_size T_RBRACK { 1220 $$ = add_array($1, true, to_int_constant($3, false)); 1221 } 1222 | direct_notype_param_decl param_list opt_asm_or_symbolrename { 1223 $$ = add_function(symbolrename($1, $3), $2); 1224 end_declaration_level(); 1225 block_level--; 1226 } 1227 ; 1228 1229 /* TODO: rename 'pointer' to something less ambiguous, maybe 'pointer_level' */ 1230 pointer: 1231 asterisk { 1232 $$ = $1; 1233 } 1234 | asterisk type_qualifier_list { 1235 /* TODO: rename pqinf_t to be more expressive */ 1236 /* TODO: then rename the merge function */ 1237 $$ = merge_pointers_and_qualifiers($1, $2); 1238 } 1239 | asterisk pointer { 1240 $$ = merge_pointers_and_qualifiers($1, $2); 1241 } 1242 | asterisk type_qualifier_list pointer { 1243 $$ = merge_pointers_and_qualifiers($1, $2); 1244 $$ = merge_pointers_and_qualifiers($$, $3); 1245 } 1246 ; 1247 1248 asterisk: 1249 T_ASTERISK { 1250 $$ = xcalloc(1, sizeof(*$$)); 1251 $$->p_pointer = true; 1252 } 1253 ; 1254 1255 /* TODO: try whether type_qualifier_list_opt makes the code simpler */ 1256 type_qualifier_list: 1257 type_qualifier { 1258 $$ = $1; 1259 } 1260 | type_qualifier_list type_qualifier { 1261 $$ = merge_pointers_and_qualifiers($1, $2); 1262 } 1263 ; 1264 1265 type_qualifier: 1266 T_QUAL { 1267 $$ = xcalloc(1, sizeof(*$$)); 1268 if ($1 == CONST) { 1269 $$->p_const = true; 1270 } else if ($1 == VOLATILE) { 1271 $$->p_volatile = true; 1272 } else { 1273 lint_assert($1 == RESTRICT || $1 == THREAD); 1274 } 1275 } 1276 ; 1277 1278 param_list: 1279 id_list_lparen identifier_list T_RPAREN { 1280 $$ = $2; 1281 } 1282 | abstract_decl_param_list { 1283 $$ = $1; 1284 } 1285 ; 1286 1287 id_list_lparen: 1288 T_LPAREN { 1289 block_level++; 1290 begin_declaration_level(PROTO_ARG); 1291 } 1292 ; 1293 1294 identifier_list: 1295 T_NAME { 1296 $$ = old_style_function_name(getsym($1)); 1297 } 1298 | identifier_list T_COMMA T_NAME { 1299 $$ = lnklst($1, old_style_function_name(getsym($3))); 1300 } 1301 | identifier_list error { 1302 $$ = $1; 1303 } 1304 ; 1305 1306 abstract_decl_param_list: 1307 abstract_decl_lparen T_RPAREN opt_type_attribute { 1308 $$ = NULL; 1309 } 1310 | abstract_decl_lparen vararg_parameter_type_list T_RPAREN opt_type_attribute { 1311 dcs->d_proto = true; 1312 $$ = $2; 1313 } 1314 | abstract_decl_lparen error T_RPAREN opt_type_attribute { 1315 $$ = NULL; 1316 } 1317 ; 1318 1319 abstract_decl_lparen: 1320 T_LPAREN { 1321 block_level++; 1322 begin_declaration_level(PROTO_ARG); 1323 } 1324 ; 1325 1326 vararg_parameter_type_list: 1327 parameter_type_list { 1328 $$ = $1; 1329 } 1330 | parameter_type_list T_COMMA T_ELLIPSIS { 1331 dcs->d_vararg = true; 1332 $$ = $1; 1333 } 1334 | T_ELLIPSIS { 1335 if (sflag) { 1336 /* ANSI C requires formal parameter before '...' */ 1337 error(84); 1338 } else if (!tflag) { 1339 /* ANSI C requires formal parameter before '...' */ 1340 warning(84); 1341 } 1342 dcs->d_vararg = true; 1343 $$ = NULL; 1344 } 1345 ; 1346 1347 parameter_type_list: 1348 parameter_declaration { 1349 $$ = $1; 1350 } 1351 | parameter_type_list T_COMMA parameter_declaration { 1352 $$ = lnklst($1, $3); 1353 } 1354 ; 1355 1356 parameter_declaration: 1357 declmods deftyp { 1358 $$ = declare_argument(abstract_name(), false); 1359 } 1360 | declaration_specifiers deftyp { 1361 $$ = declare_argument(abstract_name(), false); 1362 } 1363 | declmods deftyp notype_param_decl { 1364 $$ = declare_argument($3, false); 1365 } 1366 /* 1367 * param_decl is needed because of following conflict: 1368 * "typedef int a; f(int (a));" could be parsed as 1369 * "function with argument a of type int", or 1370 * "function with an abstract argument of type function". 1371 * This grammar realizes the second case. 1372 */ 1373 | declaration_specifiers deftyp param_decl { 1374 $$ = declare_argument($3, false); 1375 } 1376 | declmods deftyp abstract_decl { 1377 $$ = declare_argument($3, false); 1378 } 1379 | declaration_specifiers deftyp abstract_decl { 1380 $$ = declare_argument($3, false); 1381 } 1382 ; 1383 1384 opt_asm_or_symbolrename: /* expect only one */ 1385 /* empty */ { 1386 $$ = NULL; 1387 } 1388 | T_ASM T_LPAREN T_STRING T_RPAREN { 1389 freeyyv(&$3, T_STRING); 1390 $$ = NULL; 1391 } 1392 | T_SYMBOLRENAME T_LPAREN T_NAME T_RPAREN { 1393 $$ = $3; 1394 } 1395 ; 1396 1397 initializer: /* C99 6.7.8 "Initialization" */ 1398 expr %prec T_COMMA { 1399 init_expr($1); 1400 } 1401 | init_lbrace init_rbrace { 1402 /* XXX: Empty braces are not covered by C99 6.7.8. */ 1403 } 1404 | init_lbrace initializer_list comma_opt init_rbrace 1405 | error 1406 ; 1407 1408 initializer_list: /* C99 6.7.8 "Initialization" */ 1409 initializer_list_item 1410 | initializer_list T_COMMA initializer_list_item 1411 ; 1412 1413 initializer_list_item: 1414 designation initializer 1415 | initializer 1416 ; 1417 1418 range: 1419 constant_expr { 1420 $$.lo = to_int_constant($1, true); 1421 $$.hi = $$.lo; 1422 } 1423 | constant_expr T_ELLIPSIS constant_expr { 1424 $$.lo = to_int_constant($1, true); 1425 $$.hi = to_int_constant($3, true); 1426 /* initialization with '[a...b]' is a GNU extension */ 1427 gnuism(340); 1428 } 1429 ; 1430 1431 designator: /* C99 6.7.8 "Initialization" */ 1432 T_LBRACK range T_RBRACK { 1433 add_designator_subscript($2); 1434 if (!Sflag) 1435 /* array initializer with des.s is a C9X feature */ 1436 warning(321); 1437 } 1438 | T_POINT identifier { 1439 if (!Sflag) 1440 /* struct or union member name in initializer is ... */ 1441 warning(313); 1442 add_designator_member($2); 1443 } 1444 ; 1445 1446 designator_list: /* C99 6.7.8 "Initialization" */ 1447 designator 1448 | designator_list designator 1449 ; 1450 1451 /* TODO: order from big to small */ 1452 designation: /* C99 6.7.8 "Initialization" */ 1453 designator_list T_ASSIGN 1454 | identifier T_COLON { 1455 /* GCC style struct or union member name in initializer */ 1456 gnuism(315); 1457 add_designator_member($1); 1458 } 1459 ; 1460 1461 init_lbrace: 1462 T_LBRACE { 1463 init_lbrace(); 1464 } 1465 ; 1466 1467 init_rbrace: 1468 T_RBRACE { 1469 init_rbrace(); 1470 } 1471 ; 1472 1473 type_name: 1474 { 1475 begin_declaration_level(ABSTRACT); 1476 } abstract_declaration { 1477 end_declaration_level(); 1478 $$ = $2->s_type; 1479 } 1480 ; 1481 1482 abstract_declaration: 1483 noclass_declmods deftyp { 1484 $$ = declare_1_abstract(abstract_name()); 1485 } 1486 | noclass_declspecs deftyp { 1487 $$ = declare_1_abstract(abstract_name()); 1488 } 1489 | noclass_declmods deftyp abstract_decl { 1490 $$ = declare_1_abstract($3); 1491 } 1492 | noclass_declspecs deftyp abstract_decl { 1493 $$ = declare_1_abstract($3); 1494 } 1495 ; 1496 1497 /* TODO: abstract_declaration and abstract_decl sound too similar */ 1498 abstract_decl: 1499 pointer { 1500 $$ = add_pointer(abstract_name(), $1); 1501 } 1502 | direct_abstract_decl { 1503 $$ = $1; 1504 } 1505 | pointer direct_abstract_decl { 1506 $$ = add_pointer($2, $1); 1507 } 1508 | T_TYPEOF term { 1509 $$ = mktempsym($2->tn_type); 1510 } 1511 ; 1512 1513 direct_abstract_decl: 1514 T_LPAREN abstract_decl T_RPAREN { 1515 $$ = $2; 1516 } 1517 | T_LBRACK T_RBRACK { 1518 $$ = add_array(abstract_name(), false, 0); 1519 } 1520 | T_LBRACK array_size T_RBRACK { 1521 $$ = add_array(abstract_name(), true, to_int_constant($2, false)); 1522 } 1523 | type_attribute direct_abstract_decl { 1524 $$ = $2; 1525 } 1526 | direct_abstract_decl T_LBRACK T_RBRACK { 1527 $$ = add_array($1, false, 0); 1528 } 1529 | direct_abstract_decl T_LBRACK array_size T_RBRACK { 1530 $$ = add_array($1, true, to_int_constant($3, false)); 1531 } 1532 | abstract_decl_param_list opt_asm_or_symbolrename { 1533 $$ = add_function(symbolrename(abstract_name(), $2), $1); 1534 end_declaration_level(); 1535 block_level--; 1536 } 1537 | direct_abstract_decl abstract_decl_param_list opt_asm_or_symbolrename { 1538 $$ = add_function(symbolrename($1, $3), $2); 1539 end_declaration_level(); 1540 block_level--; 1541 } 1542 | direct_abstract_decl type_attribute_list 1543 ; 1544 1545 non_expr_statement: 1546 type_attribute T_SEMI 1547 | labeled_statement 1548 | compound_statement 1549 | selection_statement 1550 | iteration_statement 1551 | jump_statement { 1552 seen_fallthrough = false; 1553 } 1554 | asm_statement 1555 ; 1556 1557 statement: /* C99 6.8 */ 1558 expr_statement 1559 | non_expr_statement 1560 ; 1561 1562 labeled_statement: /* C99 6.8.1 */ 1563 label opt_type_attribute statement 1564 ; 1565 1566 label: 1567 T_NAME T_COLON { 1568 symtyp = FLABEL; 1569 named_label(getsym($1)); 1570 } 1571 | T_CASE constant_expr T_COLON { 1572 case_label($2); 1573 seen_fallthrough = true; 1574 } 1575 | T_CASE constant_expr T_ELLIPSIS constant_expr T_COLON { 1576 /* XXX: We don't fill all cases */ 1577 case_label($2); 1578 seen_fallthrough = true; 1579 } 1580 | T_DEFAULT T_COLON { 1581 default_label(); 1582 seen_fallthrough = true; 1583 } 1584 ; 1585 1586 compound_statement: /* C99 6.8.2 */ 1587 compound_statement_lbrace compound_statement_rbrace 1588 | compound_statement_lbrace block_item_list compound_statement_rbrace 1589 ; 1590 1591 compound_statement_lbrace: 1592 T_LBRACE { 1593 block_level++; 1594 mem_block_level++; 1595 begin_declaration_level(AUTO); 1596 } 1597 ; 1598 1599 compound_statement_rbrace: 1600 T_RBRACE { 1601 end_declaration_level(); 1602 freeblk(); 1603 mem_block_level--; 1604 block_level--; 1605 seen_fallthrough = false; 1606 } 1607 ; 1608 1609 block_item_list: 1610 block_item 1611 | block_item_list block_item { 1612 if (!Sflag && $1 && !$2) 1613 /* declarations after statements is a C99 feature */ 1614 c99ism(327); 1615 $$ = $1 || $2; 1616 } 1617 ; 1618 1619 block_item: 1620 statement { 1621 $$ = true; 1622 restore_warning_flags(); 1623 } 1624 | declaration { 1625 $$ = false; 1626 restore_warning_flags(); 1627 } 1628 ; 1629 1630 expr_statement: 1631 expr T_SEMI { 1632 expr($1, false, false, false, false); 1633 seen_fallthrough = false; 1634 } 1635 | T_SEMI { 1636 seen_fallthrough = false; 1637 } 1638 ; 1639 1640 selection_statement: /* C99 6.8.4 */ 1641 if_without_else { 1642 save_warning_flags(); 1643 if2(); 1644 if3(false); 1645 } 1646 | if_without_else T_ELSE { 1647 save_warning_flags(); 1648 if2(); 1649 } statement { 1650 clear_warning_flags(); 1651 if3(true); 1652 } 1653 | if_without_else T_ELSE error { 1654 clear_warning_flags(); 1655 if3(false); 1656 } 1657 | switch_expr statement { 1658 clear_warning_flags(); 1659 switch2(); 1660 } 1661 | switch_expr error { 1662 clear_warning_flags(); 1663 switch2(); 1664 } 1665 ; 1666 1667 if_without_else: 1668 if_expr statement 1669 | if_expr error 1670 ; 1671 1672 if_expr: 1673 T_IF T_LPAREN expr T_RPAREN { 1674 if1($3); 1675 clear_warning_flags(); 1676 } 1677 ; 1678 1679 switch_expr: 1680 T_SWITCH T_LPAREN expr T_RPAREN { 1681 switch1($3); 1682 clear_warning_flags(); 1683 } 1684 ; 1685 1686 generic_selection: /* C11 6.5.1.1 */ 1687 T_GENERIC T_LPAREN assignment_expression T_COMMA 1688 generic_assoc_list T_RPAREN { 1689 /* generic selection requires C11 or later */ 1690 c11ism(345); 1691 $$ = build_generic_selection($3, $5); 1692 } 1693 ; 1694 1695 generic_assoc_list: /* C11 6.5.1.1 */ 1696 generic_association 1697 | generic_assoc_list T_COMMA generic_association { 1698 $3->gat_prev = $1; 1699 $$ = $3; 1700 } 1701 ; 1702 1703 generic_association: /* C11 6.5.1.1 */ 1704 type_name T_COLON expr { 1705 $$ = getblk(sizeof(*$$)); 1706 $$->gat_arg = $1; 1707 $$->gat_result = $3; 1708 } 1709 | T_DEFAULT T_COLON expr { 1710 $$ = getblk(sizeof(*$$)); 1711 $$->gat_arg = NULL; 1712 $$->gat_result = $3; 1713 } 1714 ; 1715 1716 do_statement: /* C99 6.8.5 */ 1717 do statement { 1718 clear_warning_flags(); 1719 } 1720 ; 1721 1722 iteration_statement: /* C99 6.8.5 */ 1723 while_expr statement { 1724 clear_warning_flags(); 1725 while2(); 1726 } 1727 | while_expr error { 1728 clear_warning_flags(); 1729 while2(); 1730 } 1731 | do_statement do_while_expr { 1732 do2($2); 1733 seen_fallthrough = false; 1734 } 1735 | do error { 1736 clear_warning_flags(); 1737 do2(NULL); 1738 } 1739 | for_exprs statement { 1740 clear_warning_flags(); 1741 for2(); 1742 end_declaration_level(); 1743 block_level--; 1744 } 1745 | for_exprs error { 1746 clear_warning_flags(); 1747 for2(); 1748 end_declaration_level(); 1749 block_level--; 1750 } 1751 ; 1752 1753 while_expr: 1754 T_WHILE T_LPAREN expr T_RPAREN { 1755 while1($3); 1756 clear_warning_flags(); 1757 } 1758 ; 1759 1760 do: 1761 T_DO { 1762 do1(); 1763 } 1764 ; 1765 1766 do_while_expr: 1767 T_WHILE T_LPAREN expr T_RPAREN T_SEMI { 1768 $$ = $3; 1769 } 1770 ; 1771 1772 for_start: 1773 T_FOR T_LPAREN { 1774 begin_declaration_level(AUTO); 1775 block_level++; 1776 } 1777 ; 1778 for_exprs: 1779 for_start declaration_specifiers deftyp notype_init_decls T_SEMI 1780 opt_expr T_SEMI opt_expr T_RPAREN { 1781 /* variable declaration in for loop */ 1782 c99ism(325); 1783 for1(NULL, $6, $8); 1784 clear_warning_flags(); 1785 } 1786 | for_start opt_expr T_SEMI opt_expr T_SEMI opt_expr T_RPAREN { 1787 for1($2, $4, $6); 1788 clear_warning_flags(); 1789 } 1790 ; 1791 1792 opt_expr: 1793 /* empty */ { 1794 $$ = NULL; 1795 } 1796 | expr { 1797 $$ = $1; 1798 } 1799 ; 1800 1801 jump_statement: /* C99 6.8.6 */ 1802 goto identifier T_SEMI { 1803 do_goto(getsym($2)); 1804 } 1805 | goto error T_SEMI { 1806 symtyp = FVFT; 1807 } 1808 | T_CONTINUE T_SEMI { 1809 do_continue(); 1810 } 1811 | T_BREAK T_SEMI { 1812 do_break(); 1813 } 1814 | T_RETURN T_SEMI { 1815 do_return(NULL); 1816 } 1817 | T_RETURN expr T_SEMI { 1818 do_return($2); 1819 } 1820 ; 1821 1822 goto: 1823 T_GOTO { 1824 symtyp = FLABEL; 1825 } 1826 ; 1827 1828 asm_statement: 1829 T_ASM T_LPAREN read_until_rparen T_SEMI { 1830 setasm(); 1831 } 1832 | T_ASM T_QUAL T_LPAREN read_until_rparen T_SEMI { 1833 setasm(); 1834 } 1835 | T_ASM error 1836 ; 1837 1838 read_until_rparen: 1839 /* empty */ { 1840 ignore_up_to_rparen(); 1841 } 1842 ; 1843 1844 constant_expr_list_opt: 1845 /* empty */ 1846 | constant_expr_list 1847 ; 1848 1849 constant_expr_list: 1850 constant_expr 1851 | constant_expr_list T_COMMA constant_expr 1852 ; 1853 1854 constant_expr: /* C99 6.6 */ 1855 expr %prec T_ASSIGN { 1856 $$ = $1; 1857 } 1858 ; 1859 1860 expr: 1861 expr T_ASTERISK expr { 1862 $$ = build(MULT, $1, $3); 1863 } 1864 | expr T_MULTIPLICATIVE expr { 1865 $$ = build($2, $1, $3); 1866 } 1867 | expr T_ADDITIVE expr { 1868 $$ = build($2, $1, $3); 1869 } 1870 | expr T_SHIFT expr { 1871 $$ = build($2, $1, $3); 1872 } 1873 | expr T_RELATIONAL expr { 1874 $$ = build($2, $1, $3); 1875 } 1876 | expr T_EQUALITY expr { 1877 $$ = build($2, $1, $3); 1878 } 1879 | expr T_AMPER expr { 1880 $$ = build(BITAND, $1, $3); 1881 } 1882 | expr T_BITXOR expr { 1883 $$ = build(BITXOR, $1, $3); 1884 } 1885 | expr T_BITOR expr { 1886 $$ = build(BITOR, $1, $3); 1887 } 1888 | expr T_LOGAND expr { 1889 $$ = build(LOGAND, $1, $3); 1890 } 1891 | expr T_LOGOR expr { 1892 $$ = build(LOGOR, $1, $3); 1893 } 1894 | expr T_QUEST expr T_COLON expr { 1895 $$ = build(QUEST, $1, build(COLON, $3, $5)); 1896 } 1897 | expr T_ASSIGN expr { 1898 $$ = build(ASSIGN, $1, $3); 1899 } 1900 | expr T_OPASSIGN expr { 1901 $$ = build($2, $1, $3); 1902 } 1903 | expr T_COMMA expr { 1904 $$ = build(COMMA, $1, $3); 1905 } 1906 | term { 1907 $$ = $1; 1908 } 1909 | generic_selection { 1910 $$ = $1; 1911 } 1912 ; 1913 1914 assignment_expression: /* C99 6.5.16 */ 1915 expr %prec T_ASSIGN 1916 ; 1917 1918 term: 1919 T_NAME { 1920 /* XXX really necessary? */ 1921 if (yychar < 0) 1922 yychar = yylex(); 1923 $$ = new_name_node(getsym($1), yychar); 1924 } 1925 | string { 1926 $$ = new_string_node($1); 1927 } 1928 | T_CON { 1929 $$ = expr_new_constant(gettyp($1->v_tspec), $1); 1930 } 1931 | T_LPAREN expr T_RPAREN { 1932 if ($2 != NULL) 1933 $2->tn_parenthesized = true; 1934 $$ = $2; 1935 } 1936 | T_LPAREN compound_statement_lbrace gcc_statement_expr_list { 1937 block_level--; 1938 mem_block_level--; 1939 begin_initialization(mktempsym(dup_type($3->tn_type))); 1940 mem_block_level++; 1941 block_level++; 1942 /* ({ }) is a GCC extension */ 1943 gnuism(320); 1944 } compound_statement_rbrace T_RPAREN { 1945 $$ = new_name_node(*current_initsym(), 0); 1946 end_initialization(); 1947 } 1948 | term T_INCDEC { 1949 $$ = build($2 == INC ? INCAFT : DECAFT, $1, NULL); 1950 } 1951 | T_INCDEC term { 1952 $$ = build($1 == INC ? INCBEF : DECBEF, $2, NULL); 1953 } 1954 | T_ASTERISK term { 1955 $$ = build(INDIR, $2, NULL); 1956 } 1957 | T_AMPER term { 1958 $$ = build(ADDR, $2, NULL); 1959 } 1960 | T_UNARY term { 1961 $$ = build($1, $2, NULL); 1962 } 1963 | T_ADDITIVE term { 1964 if (tflag && $1 == PLUS) { 1965 /* unary + is illegal in traditional C */ 1966 warning(100); 1967 } 1968 $$ = build($1 == PLUS ? UPLUS : UMINUS, $2, NULL); 1969 } 1970 | term T_LBRACK expr T_RBRACK { 1971 $$ = build(INDIR, build(PLUS, $1, $3), NULL); 1972 } 1973 | term T_LPAREN T_RPAREN { 1974 $$ = new_function_call_node($1, NULL); 1975 } 1976 | term T_LPAREN func_arg_list T_RPAREN { 1977 $$ = new_function_call_node($1, $3); 1978 } 1979 | term point_or_arrow T_NAME { 1980 if ($1 != NULL) { 1981 sym_t *msym; 1982 /* 1983 * XXX struct_or_union_member should be integrated 1984 * in build() 1985 */ 1986 if ($2 == ARROW) { 1987 /* 1988 * must do this before struct_or_union_member 1989 * is called 1990 */ 1991 $1 = cconv($1); 1992 } 1993 msym = struct_or_union_member($1, $2, getsym($3)); 1994 $$ = build($2, $1, new_name_node(msym, 0)); 1995 } else { 1996 $$ = NULL; 1997 } 1998 } 1999 | T_REAL term { 2000 $$ = build(REAL, $2, NULL); 2001 } 2002 | T_IMAG term { 2003 $$ = build(IMAG, $2, NULL); 2004 } 2005 | T_EXTENSION term { 2006 $$ = $2; 2007 } 2008 | T_REAL T_LPAREN term T_RPAREN { 2009 $$ = build(REAL, $3, NULL); 2010 } 2011 | T_IMAG T_LPAREN term T_RPAREN { 2012 $$ = build(IMAG, $3, NULL); 2013 } 2014 | T_BUILTIN_OFFSETOF T_LPAREN type_name T_COMMA identifier T_RPAREN { 2015 symtyp = FMEMBER; 2016 $$ = build_offsetof($3, getsym($5)); 2017 } 2018 | T_SIZEOF term { 2019 $$ = $2 == NULL ? NULL : build_sizeof($2->tn_type); 2020 if ($$ != NULL) 2021 check_expr_misc($2, false, false, false, false, false, true); 2022 } 2023 | T_SIZEOF T_LPAREN type_name T_RPAREN %prec T_SIZEOF { 2024 $$ = build_sizeof($3); 2025 } 2026 | T_ALIGNOF T_LPAREN type_name T_RPAREN { 2027 $$ = build_alignof($3); 2028 } 2029 | T_LPAREN type_name T_RPAREN term %prec T_UNARY { 2030 $$ = cast($4, $2); 2031 } 2032 | T_LPAREN type_name T_RPAREN { /* C99 6.5.2.5 "Compound literals" */ 2033 sym_t *tmp = mktempsym($2); 2034 begin_initialization(tmp); 2035 cgram_declare(tmp, true, NULL); 2036 } init_lbrace initializer_list comma_opt init_rbrace { 2037 if (!Sflag) 2038 /* compound literals are a C9X/GCC extension */ 2039 gnuism(319); 2040 $$ = new_name_node(*current_initsym(), 0); 2041 end_initialization(); 2042 } 2043 ; 2044 2045 /* 2046 * The inner part of a GCC statement-expression of the form ({ ... }). 2047 * 2048 * https://gcc.gnu.org/onlinedocs/gcc/Statement-Exprs.html 2049 */ 2050 gcc_statement_expr_list: 2051 gcc_statement_expr_item 2052 | gcc_statement_expr_list gcc_statement_expr_item { 2053 $$ = $2; 2054 } 2055 ; 2056 2057 gcc_statement_expr_item: 2058 declaration { 2059 clear_warning_flags(); 2060 $$ = NULL; 2061 } 2062 | non_expr_statement { 2063 $$ = expr_zalloc_tnode(); 2064 $$->tn_type = gettyp(VOID); 2065 } 2066 | expr T_SEMI { 2067 if ($1 == NULL) { /* in case of syntax errors */ 2068 $$ = expr_zalloc_tnode(); 2069 $$->tn_type = gettyp(VOID); 2070 } else { 2071 /* XXX: do that only on the last name */ 2072 if ($1->tn_op == NAME) 2073 $1->tn_sym->s_used = true; 2074 $$ = $1; 2075 expr($1, false, false, false, false); 2076 seen_fallthrough = false; 2077 } 2078 } 2079 ; 2080 2081 string: 2082 T_STRING { 2083 $$ = $1; 2084 } 2085 | T_STRING string2 { 2086 $$ = cat_strings($1, $2); 2087 } 2088 ; 2089 2090 string2: 2091 T_STRING { 2092 if (tflag) { 2093 /* concatenated strings are illegal in traditional C */ 2094 warning(219); 2095 } 2096 $$ = $1; 2097 } 2098 | string2 T_STRING { 2099 $$ = cat_strings($1, $2); 2100 } 2101 ; 2102 2103 func_arg_list: 2104 expr %prec T_COMMA { 2105 $$ = new_function_argument_node(NULL, $1); 2106 } 2107 | func_arg_list T_COMMA expr { 2108 $$ = new_function_argument_node($1, $3); 2109 } 2110 ; 2111 2112 point_or_arrow: 2113 T_POINT { 2114 symtyp = FMEMBER; 2115 $$ = POINT; 2116 } 2117 | T_ARROW { 2118 symtyp = FMEMBER; 2119 $$ = ARROW; 2120 } 2121 ; 2122 2123 identifier: /* C99 6.4.2.1 */ 2124 T_NAME { 2125 $$ = $1; 2126 cgram_debug("name '%s'", $$->sb_name); 2127 } 2128 | T_TYPENAME { 2129 $$ = $1; 2130 cgram_debug("typename '%s'", $$->sb_name); 2131 } 2132 ; 2133 2134 comma_opt: 2135 T_COMMA 2136 | /* empty */ 2137 ; 2138 %% 2139 2140 /* ARGSUSED */ 2141 int 2142 yyerror(const char *msg) 2143 { 2144 /* syntax error '%s' */ 2145 error(249, yytext); 2146 if (++sytxerr >= 5) 2147 norecover(); 2148 return 0; 2149 } 2150 2151 static void 2152 cgram_declare(sym_t *decl, bool initflg, sbuf_t *renaming) 2153 { 2154 declare(decl, initflg, renaming); 2155 if (renaming != NULL) 2156 freeyyv(&renaming, T_NAME); 2157 } 2158 2159 /* 2160 * Discard all input tokens up to and including the next 2161 * unmatched right paren 2162 */ 2163 static void 2164 ignore_up_to_rparen(void) 2165 { 2166 int level; 2167 2168 if (yychar < 0) 2169 yychar = yylex(); 2170 freeyyv(&yylval, yychar); 2171 2172 level = 1; 2173 while (yychar != T_RPAREN || --level > 0) { 2174 if (yychar == T_LPAREN) { 2175 level++; 2176 } else if (yychar <= 0) { 2177 break; 2178 } 2179 freeyyv(&yylval, yychar = yylex()); 2180 } 2181 2182 yyclearin; 2183 } 2184 2185 static sym_t * 2186 symbolrename(sym_t *s, sbuf_t *sb) 2187 { 2188 if (sb != NULL) 2189 s->s_rename = sb->sb_name; 2190 return s; 2191 } 2192
Indexes created Sat Oct 11 13:09:53 GMT 2025