cgram.y revision 1.236
1 %{ 2 /* $NetBSD: cgram.y,v 1.236 2021/06/27 19:10:29 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 1.236 2021/06/27 19:10:29 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 }; 143 144 %token T_LBRACE T_RBRACE T_LBRACK T_RBRACK T_LPAREN T_RPAREN 145 %token T_POINT T_ARROW 146 %token <y_op> T_UNARY 147 %token <y_op> T_INCDEC 148 %token T_SIZEOF 149 %token T_BUILTIN_OFFSETOF 150 %token T_TYPEOF 151 %token T_EXTENSION 152 %token T_ALIGNAS 153 %token T_ALIGNOF 154 %token T_ASTERISK 155 %token <y_op> T_MULTIPLICATIVE 156 %token <y_op> T_ADDITIVE 157 %token <y_op> T_SHIFT 158 %token <y_op> T_RELATIONAL 159 %token <y_op> T_EQUALITY 160 %token T_AMPER 161 %token T_BITXOR 162 %token T_BITOR 163 %token T_LOGAND 164 %token T_LOGOR 165 %token T_QUEST 166 %token T_COLON 167 %token T_ASSIGN 168 %token <y_op> T_OPASSIGN 169 %token T_COMMA 170 %token T_SEMI 171 %token T_ELLIPSIS 172 %token T_REAL 173 %token T_IMAG 174 %token T_GENERIC 175 %token T_NORETURN 176 177 /* storage classes (extern, static, auto, register and typedef) */ 178 %token <y_scl> T_SCLASS 179 180 /* 181 * predefined type keywords (char, int, short, long, unsigned, signed, 182 * float, double, void); see T_TYPENAME 183 */ 184 %token <y_tspec> T_TYPE 185 186 /* qualifiers (const, volatile, restrict, _Thread_local) */ 187 %token <y_tqual> T_QUAL 188 189 /* struct or union */ 190 %token <y_tspec> T_STRUCT_OR_UNION 191 192 /* remaining keywords */ 193 %token T_ASM 194 %token T_BREAK 195 %token T_CASE 196 %token T_CONTINUE 197 %token T_DEFAULT 198 %token T_DO 199 %token T_ELSE 200 %token T_ENUM 201 %token T_FOR 202 %token T_GOTO 203 %token T_IF 204 %token T_PACKED 205 %token T_RETURN 206 %token T_SWITCH 207 %token T_SYMBOLRENAME 208 %token T_WHILE 209 /* Type Attributes */ 210 %token <y_type> T_ATTRIBUTE 211 %token <y_type> T_AT_ALIAS 212 %token <y_type> T_AT_ALIGNED 213 %token <y_type> T_AT_ALLOC_SIZE 214 %token <y_type> T_AT_ALWAYS_INLINE 215 %token <y_type> T_AT_BOUNDED 216 %token <y_type> T_AT_BUFFER 217 %token <y_type> T_AT_COLD 218 %token <y_type> T_AT_COMMON 219 %token <y_type> T_AT_CONSTRUCTOR 220 %token <y_type> T_AT_DEPRECATED 221 %token <y_type> T_AT_DESTRUCTOR 222 %token <y_type> T_AT_FALLTHROUGH 223 %token <y_type> T_AT_FORMAT 224 %token <y_type> T_AT_FORMAT_ARG 225 %token <y_type> T_AT_FORMAT_GNU_PRINTF 226 %token <y_type> T_AT_FORMAT_PRINTF 227 %token <y_type> T_AT_FORMAT_SCANF 228 %token <y_type> T_AT_FORMAT_STRFMON 229 %token <y_type> T_AT_FORMAT_STRFTIME 230 %token <y_type> T_AT_FORMAT_SYSLOG 231 %token <y_type> T_AT_GNU_INLINE 232 %token <y_type> T_AT_MALLOC 233 %token <y_type> T_AT_MAY_ALIAS 234 %token <y_type> T_AT_MINBYTES 235 %token <y_type> T_AT_MODE 236 %token <y_type> T_AT_NOINLINE 237 %token <y_type> T_AT_NONNULL 238 %token <y_type> T_AT_NONSTRING 239 %token <y_type> T_AT_NORETURN 240 %token <y_type> T_AT_NOTHROW 241 %token <y_type> T_AT_NO_INSTRUMENT_FUNCTION 242 %token <y_type> T_AT_OPTIMIZE 243 %token <y_type> T_AT_PACKED 244 %token <y_type> T_AT_PCS 245 %token <y_type> T_AT_PURE 246 %token <y_type> T_AT_RETURNS_TWICE 247 %token <y_type> T_AT_SECTION 248 %token <y_type> T_AT_SENTINEL 249 %token <y_type> T_AT_STRING 250 %token <y_type> T_AT_TLS_MODEL 251 %token <y_type> T_AT_TUNION 252 %token <y_type> T_AT_UNUSED 253 %token <y_type> T_AT_USED 254 %token <y_type> T_AT_VISIBILITY 255 %token <y_type> T_AT_WARN_UNUSED_RESULT 256 %token <y_type> T_AT_WEAK 257 258 %left T_COMMA 259 %right T_ASSIGN T_OPASSIGN 260 %right T_QUEST T_COLON 261 %left T_LOGOR 262 %left T_LOGAND 263 %left T_BITOR 264 %left T_BITXOR 265 %left T_AMPER 266 %left T_EQUALITY 267 %left T_RELATIONAL 268 %left T_SHIFT 269 %left T_ADDITIVE 270 %left T_ASTERISK T_MULTIPLICATIVE 271 %right T_UNARY T_INCDEC T_SIZEOF T_REAL T_IMAG 272 %left T_LPAREN T_LBRACK T_POINT T_ARROW 273 274 %token <y_sb> T_NAME 275 %token <y_sb> T_TYPENAME 276 %token <y_val> T_CON 277 %token <y_string> T_STRING 278 279 %type <y_sym> func_decl 280 %type <y_sym> notype_decl 281 %type <y_sym> type_decl 282 %type <y_type> typespec 283 %type <y_type> clrtyp_typespec 284 %type <y_type> notype_typespec 285 %type <y_type> struct_spec 286 %type <y_type> enum_spec 287 %type <y_sym> struct_tag 288 %type <y_sym> enum_tag 289 %type <y_tspec> struct 290 %type <y_sym> struct_declaration 291 %type <y_sb> identifier 292 %type <y_sym> member_declaration_list_with_rbrace 293 %type <y_sym> member_declaration_list 294 %type <y_sym> member_declaration 295 %type <y_sym> notype_member_decls 296 %type <y_sym> type_member_decls 297 %type <y_sym> notype_member_decl 298 %type <y_sym> type_member_decl 299 %type <y_tnode> constant_expr 300 %type <y_tnode> array_size 301 %type <y_sym> enum_declaration 302 %type <y_sym> enums_with_opt_comma 303 %type <y_sym> enums 304 %type <y_sym> enumerator 305 %type <y_sym> enumeration_constant 306 %type <y_sym> notype_direct_decl 307 %type <y_sym> type_direct_decl 308 %type <y_pqinf> pointer 309 %type <y_pqinf> asterisk 310 %type <y_sym> param_decl 311 %type <y_sym> param_list 312 %type <y_sym> abstract_decl_param_list 313 %type <y_sym> direct_param_decl 314 %type <y_sym> notype_param_decl 315 %type <y_sym> direct_notype_param_decl 316 %type <y_pqinf> type_qualifier_list 317 %type <y_pqinf> type_qualifier 318 %type <y_sym> identifier_list 319 %type <y_sym> abstract_decl 320 %type <y_sym> direct_abstract_decl 321 %type <y_sym> vararg_parameter_type_list 322 %type <y_sym> parameter_type_list 323 %type <y_sym> parameter_declaration 324 %type <y_tnode> expr 325 %type <y_tnode> gcc_statement_expr_list 326 %type <y_tnode> gcc_statement_expr_item 327 %type <y_tnode> term 328 %type <y_tnode> generic_selection 329 %type <y_tnode> func_arg_list 330 %type <y_op> point_or_arrow 331 %type <y_type> type_name 332 %type <y_sym> abstract_declaration 333 %type <y_tnode> do_while_expr 334 %type <y_tnode> opt_expr 335 %type <y_string> string 336 %type <y_string> string2 337 %type <y_sb> opt_asm_or_symbolrename 338 %type <y_range> range 339 %type <y_seen_statement> block_item_list 340 %type <y_seen_statement> block_item 341 342 343 %% 344 345 program: 346 /* empty */ { 347 if (sflag) { 348 /* empty translation unit */ 349 error(272); 350 } else if (!tflag) { 351 /* empty translation unit */ 352 warning(272); 353 } 354 } 355 | translation_unit 356 ; 357 358 translation_unit: /* C99 6.9 */ 359 external_declaration 360 | translation_unit external_declaration 361 ; 362 363 external_declaration: /* C99 6.9 */ 364 asm_statement 365 | function_definition { 366 global_clean_up_decl(false); 367 clear_warning_flags(); 368 } 369 | top_level_declaration { 370 global_clean_up_decl(false); 371 clear_warning_flags(); 372 } 373 ; 374 375 /* 376 * On the top level, lint allows several forms of declarations that it doesn't 377 * allow in functions. For example, a single ';' is an empty declaration and 378 * is supported by some compilers, but in a function it would be an empty 379 * statement, not a declaration. This makes a difference in C90 mode, where 380 * a statement must not be followed by a declaration. 381 * 382 * See 'declaration' for all other declarations. 383 */ 384 top_level_declaration: /* C99 6.9 calls this 'declaration' */ 385 T_SEMI { 386 if (sflag) { 387 /* empty declaration */ 388 error(0); 389 } else if (!tflag) { 390 /* empty declaration */ 391 warning(0); 392 } 393 } 394 | clrtyp deftyp notype_init_decls T_SEMI { 395 if (sflag) { 396 /* old style declaration; add 'int' */ 397 error(1); 398 } else if (!tflag) { 399 /* old style declaration; add 'int' */ 400 warning(1); 401 } 402 } 403 | declmods deftyp T_SEMI { 404 if (dcs->d_scl == TYPEDEF) { 405 /* typedef declares no type name */ 406 warning(72); 407 } else { 408 /* empty declaration */ 409 warning(2); 410 } 411 } 412 | declmods deftyp notype_init_decls T_SEMI 413 | declaration_specifiers deftyp T_SEMI { 414 if (dcs->d_scl == TYPEDEF) { 415 /* typedef declares no type name */ 416 warning(72); 417 } else if (!dcs->d_nonempty_decl) { 418 /* empty declaration */ 419 warning(2); 420 } 421 } 422 | declaration_specifiers deftyp type_init_decls T_SEMI 423 | error T_SEMI { 424 global_clean_up(); 425 } 426 | error T_RBRACE { 427 global_clean_up(); 428 } 429 ; 430 431 function_definition: /* C99 6.9.1 */ 432 func_decl { 433 if ($1->s_type->t_tspec != FUNC) { 434 /* syntax error '%s' */ 435 error(249, yytext); 436 YYERROR; 437 } 438 if ($1->s_type->t_typedef) { 439 /* ()-less function definition */ 440 error(64); 441 YYERROR; 442 } 443 funcdef($1); 444 block_level++; 445 begin_declaration_level(ARG); 446 if (lwarn == LWARN_NONE) 447 $1->s_used = true; 448 } arg_declaration_list_opt { 449 end_declaration_level(); 450 block_level--; 451 check_func_lint_directives(); 452 check_func_old_style_arguments(); 453 begin_control_statement(CS_FUNCTION_BODY); 454 } compound_statement { 455 funcend(); 456 end_control_statement(CS_FUNCTION_BODY); 457 } 458 ; 459 460 func_decl: 461 clrtyp deftyp notype_decl { 462 $$ = $3; 463 } 464 | declmods deftyp notype_decl { 465 $$ = $3; 466 } 467 | declaration_specifiers deftyp type_decl { 468 $$ = $3; 469 } 470 ; 471 472 arg_declaration_list_opt: /* C99 6.9.1p13 example 1 */ 473 /* empty */ 474 | arg_declaration_list 475 ; 476 477 arg_declaration_list: /* C99 6.9.1p13 example 1 */ 478 arg_declaration 479 | arg_declaration_list arg_declaration 480 /* XXX or better "arg_declaration error" ? */ 481 | error 482 ; 483 484 /* 485 * "arg_declaration" is separated from "declaration" because it 486 * needs other error handling. 487 */ 488 arg_declaration: 489 declmods deftyp T_SEMI { 490 /* empty declaration */ 491 warning(2); 492 } 493 | declmods deftyp notype_init_decls T_SEMI 494 | declaration_specifiers deftyp T_SEMI { 495 if (!dcs->d_nonempty_decl) { 496 /* empty declaration */ 497 warning(2); 498 } else { 499 /* '%s' declared in argument declaration list */ 500 warning(3, type_name(dcs->d_type)); 501 } 502 } 503 | declaration_specifiers deftyp type_init_decls T_SEMI { 504 if (dcs->d_nonempty_decl) { 505 /* '%s' declared in argument declaration list */ 506 warning(3, type_name(dcs->d_type)); 507 } 508 } 509 | declmods error 510 | declaration_specifiers error 511 ; 512 513 declaration: /* C99 6.7 */ 514 declmods deftyp T_SEMI { 515 if (dcs->d_scl == TYPEDEF) { 516 /* typedef declares no type name */ 517 warning(72); 518 } else { 519 /* empty declaration */ 520 warning(2); 521 } 522 } 523 | declmods deftyp notype_init_decls T_SEMI 524 | declaration_specifiers deftyp T_SEMI { 525 if (dcs->d_scl == TYPEDEF) { 526 /* typedef declares no type name */ 527 warning(72); 528 } else if (!dcs->d_nonempty_decl) { 529 /* empty declaration */ 530 warning(2); 531 } 532 } 533 | declaration_specifiers deftyp type_init_decls T_SEMI 534 | error T_SEMI 535 ; 536 537 type_attribute_format_type: 538 T_AT_FORMAT_GNU_PRINTF 539 | T_AT_FORMAT_PRINTF 540 | T_AT_FORMAT_SCANF 541 | T_AT_FORMAT_STRFMON 542 | T_AT_FORMAT_STRFTIME 543 | T_AT_FORMAT_SYSLOG 544 ; 545 546 type_attribute_bounded_type: 547 T_AT_MINBYTES 548 | T_AT_STRING 549 | T_AT_BUFFER 550 ; 551 552 553 type_attribute_spec: 554 /* empty */ 555 | T_AT_ALWAYS_INLINE 556 | T_AT_ALIAS T_LPAREN string T_RPAREN 557 | T_AT_ALIGNED T_LPAREN constant_expr T_RPAREN 558 | T_AT_ALIGNED 559 | T_AT_ALLOC_SIZE T_LPAREN constant_expr T_COMMA constant_expr T_RPAREN 560 | T_AT_ALLOC_SIZE T_LPAREN constant_expr T_RPAREN 561 | T_AT_BOUNDED T_LPAREN type_attribute_bounded_type 562 T_COMMA constant_expr T_COMMA constant_expr T_RPAREN 563 | T_AT_COLD 564 | T_AT_COMMON 565 | T_AT_CONSTRUCTOR T_LPAREN constant_expr T_RPAREN 566 | T_AT_CONSTRUCTOR 567 | T_AT_DEPRECATED T_LPAREN string T_RPAREN 568 | T_AT_DEPRECATED 569 | T_AT_DESTRUCTOR T_LPAREN constant_expr T_RPAREN 570 | T_AT_DESTRUCTOR 571 | T_AT_FALLTHROUGH { 572 fallthru(1); 573 } 574 | T_AT_FORMAT T_LPAREN type_attribute_format_type T_COMMA 575 constant_expr T_COMMA constant_expr T_RPAREN 576 | T_AT_FORMAT_ARG T_LPAREN constant_expr T_RPAREN 577 | T_AT_GNU_INLINE 578 | T_AT_MALLOC 579 | T_AT_MAY_ALIAS 580 | T_AT_MODE T_LPAREN T_NAME T_RPAREN 581 | T_AT_NOINLINE 582 | T_AT_NONNULL T_LPAREN constant_expr_list_opt T_RPAREN 583 | T_AT_NONNULL 584 | T_AT_NONSTRING 585 | T_AT_NORETURN 586 | T_AT_NOTHROW 587 | T_AT_NO_INSTRUMENT_FUNCTION 588 | T_AT_OPTIMIZE T_LPAREN string T_RPAREN 589 | T_AT_PACKED { 590 addpacked(); 591 } 592 | T_AT_PCS T_LPAREN string T_RPAREN 593 | T_AT_PURE 594 | T_AT_RETURNS_TWICE 595 | T_AT_SECTION T_LPAREN string T_RPAREN 596 | T_AT_SENTINEL T_LPAREN constant_expr T_RPAREN 597 | T_AT_SENTINEL 598 | T_AT_TLS_MODEL T_LPAREN string T_RPAREN 599 | T_AT_TUNION 600 | T_AT_UNUSED { 601 add_attr_used(); 602 } 603 | T_AT_USED { 604 add_attr_used(); 605 } 606 | T_AT_VISIBILITY T_LPAREN constant_expr T_RPAREN 607 | T_AT_WARN_UNUSED_RESULT 608 | T_AT_WEAK 609 | T_QUAL { 610 if ($1 != CONST) 611 yyerror("Bad attribute"); 612 } 613 ; 614 615 type_attribute_spec_list: 616 type_attribute_spec 617 | type_attribute_spec_list T_COMMA type_attribute_spec 618 ; 619 620 align_as: 621 typespec 622 | constant_expr 623 ; 624 625 type_attribute: 626 T_ATTRIBUTE T_LPAREN T_LPAREN { 627 attron = true; 628 } type_attribute_spec_list { 629 attron = false; 630 } T_RPAREN T_RPAREN 631 | T_ALIGNAS T_LPAREN align_as T_RPAREN { 632 } 633 | T_PACKED { 634 addpacked(); 635 } 636 | T_NORETURN { 637 } 638 ; 639 640 type_attribute_list: 641 type_attribute 642 | type_attribute_list type_attribute 643 ; 644 645 clrtyp: 646 /* empty */ { 647 clrtyp(); 648 } 649 ; 650 651 deftyp: 652 /* empty */ { 653 deftyp(); 654 } 655 ; 656 657 declaration_specifiers: /* C99 6.7 */ 658 clrtyp_typespec { 659 add_type($1); 660 } 661 | declmods typespec { 662 add_type($2); 663 } 664 | type_attribute declaration_specifiers 665 | declaration_specifiers declmod 666 | declaration_specifiers notype_typespec { 667 add_type($2); 668 } 669 ; 670 671 declmods: 672 clrtyp T_QUAL { 673 add_qualifier($2); 674 } 675 | clrtyp T_SCLASS { 676 add_storage_class($2); 677 } 678 | declmods declmod 679 ; 680 681 declmod: 682 T_QUAL { 683 add_qualifier($1); 684 } 685 | T_SCLASS { 686 add_storage_class($1); 687 } 688 | type_attribute_list 689 ; 690 691 clrtyp_typespec: 692 clrtyp notype_typespec { 693 $$ = $2; 694 } 695 | T_TYPENAME clrtyp { 696 $$ = getsym($1)->s_type; 697 } 698 ; 699 700 typespec: 701 notype_typespec { 702 $$ = $1; 703 } 704 | T_TYPENAME { 705 $$ = getsym($1)->s_type; 706 } 707 ; 708 709 notype_typespec: 710 T_TYPE { 711 $$ = gettyp($1); 712 } 713 | T_TYPEOF term { 714 $$ = $2->tn_type; 715 } 716 | struct_spec { 717 end_declaration_level(); 718 $$ = $1; 719 } 720 | enum_spec { 721 end_declaration_level(); 722 $$ = $1; 723 } 724 ; 725 726 struct_spec: 727 struct struct_tag { 728 /* 729 * STDC requires that "struct a;" always introduces 730 * a new tag if "a" is not declared at current level 731 * 732 * yychar is valid because otherwise the parser would not 733 * have been able to decide if it must shift or reduce 734 */ 735 $$ = mktag($2, $1, false, yychar == T_SEMI); 736 } 737 | struct struct_tag { 738 dcs->d_tagtyp = mktag($2, $1, true, false); 739 } struct_declaration { 740 $$ = complete_tag_struct_or_union(dcs->d_tagtyp, $4); 741 } 742 | struct { 743 dcs->d_tagtyp = mktag(NULL, $1, true, false); 744 } struct_declaration { 745 $$ = complete_tag_struct_or_union(dcs->d_tagtyp, $3); 746 } 747 | struct error { 748 symtyp = FVFT; 749 $$ = gettyp(INT); 750 } 751 ; 752 753 struct: 754 struct type_attribute 755 | T_STRUCT_OR_UNION { 756 symtyp = FTAG; 757 begin_declaration_level($1 == STRUCT ? MOS : MOU); 758 dcs->d_offset = 0; 759 dcs->d_stralign = CHAR_SIZE; 760 $$ = $1; 761 } 762 ; 763 764 struct_tag: 765 identifier { 766 $$ = getsym($1); 767 } 768 ; 769 770 struct_declaration: 771 struct_decl_lbrace member_declaration_list_with_rbrace { 772 $$ = $2; 773 } 774 ; 775 776 struct_decl_lbrace: 777 T_LBRACE { 778 symtyp = FVFT; 779 } 780 ; 781 782 member_declaration_list_with_rbrace: 783 member_declaration_list T_SEMI T_RBRACE { 784 $$ = $1; 785 } 786 | member_declaration_list T_RBRACE { 787 if (sflag) { 788 /* syntax req. ';' after last struct/union member */ 789 error(66); 790 } else { 791 /* syntax req. ';' after last struct/union member */ 792 warning(66); 793 } 794 $$ = $1; 795 } 796 | T_RBRACE { 797 $$ = NULL; 798 } 799 ; 800 801 opt_type_attribute: 802 /* empty */ 803 | type_attribute 804 ; 805 806 member_declaration_list: 807 member_declaration { 808 $$ = $1; 809 } 810 | member_declaration_list T_SEMI member_declaration { 811 $$ = lnklst($1, $3); 812 } 813 ; 814 815 member_declaration: 816 noclass_declmods deftyp { 817 /* too late, i know, but getsym() compensates it */ 818 symtyp = FMEMBER; 819 } notype_member_decls opt_type_attribute { 820 symtyp = FVFT; 821 $$ = $4; 822 } 823 | noclass_declspecs deftyp { 824 symtyp = FMEMBER; 825 } type_member_decls opt_type_attribute { 826 symtyp = FVFT; 827 $$ = $4; 828 } 829 | noclass_declmods deftyp opt_type_attribute { 830 symtyp = FVFT; 831 /* struct or union member must be named */ 832 if (!Sflag) 833 /* anonymous struct/union members is a C9X feature */ 834 warning(49); 835 /* add all the members of the anonymous struct/union */ 836 $$ = dcs->d_type->t_str->sou_first_member; 837 anonymize($$); 838 } 839 | noclass_declspecs deftyp opt_type_attribute { 840 symtyp = FVFT; 841 /* struct or union member must be named */ 842 if (!Sflag) 843 /* anonymous struct/union members is a C9X feature */ 844 warning(49); 845 if (is_struct_or_union(dcs->d_type->t_tspec)) { 846 $$ = dcs->d_type->t_str->sou_first_member; 847 /* add all the members of the anonymous struct/union */ 848 anonymize($$); 849 } else { 850 /* syntax error '%s' */ 851 error(249, "unnamed member"); 852 $$ = NULL; 853 } 854 } 855 | error { 856 symtyp = FVFT; 857 $$ = NULL; 858 } 859 ; 860 861 noclass_declspecs: 862 clrtyp_typespec { 863 add_type($1); 864 } 865 | type_attribute noclass_declspecs 866 | noclass_declmods typespec { 867 add_type($2); 868 } 869 | noclass_declspecs T_QUAL { 870 add_qualifier($2); 871 } 872 | noclass_declspecs notype_typespec { 873 add_type($2); 874 } 875 | noclass_declspecs type_attribute 876 ; 877 878 noclass_declmods: 879 clrtyp T_QUAL { 880 add_qualifier($2); 881 } 882 | noclass_declmods T_QUAL { 883 add_qualifier($2); 884 } 885 ; 886 887 notype_member_decls: 888 notype_member_decl { 889 $$ = declarator_1_struct_union($1); 890 } 891 | notype_member_decls { 892 symtyp = FMEMBER; 893 } T_COMMA type_member_decl { 894 $$ = lnklst($1, declarator_1_struct_union($4)); 895 } 896 ; 897 898 type_member_decls: 899 type_member_decl { 900 $$ = declarator_1_struct_union($1); 901 } 902 | type_member_decls { 903 symtyp = FMEMBER; 904 } T_COMMA type_member_decl { 905 $$ = lnklst($1, declarator_1_struct_union($4)); 906 } 907 ; 908 909 notype_member_decl: 910 notype_decl { 911 $$ = $1; 912 } 913 | notype_decl T_COLON constant_expr { /* C99 6.7.2.1 */ 914 $$ = bitfield($1, to_int_constant($3, true)); 915 } 916 | { 917 symtyp = FVFT; 918 } T_COLON constant_expr { /* C99 6.7.2.1 */ 919 $$ = bitfield(NULL, to_int_constant($3, true)); 920 } 921 ; 922 923 type_member_decl: 924 type_decl { 925 $$ = $1; 926 } 927 | type_decl T_COLON constant_expr { 928 $$ = bitfield($1, to_int_constant($3, true)); 929 } 930 | { 931 symtyp = FVFT; 932 } T_COLON constant_expr { 933 $$ = bitfield(NULL, to_int_constant($3, true)); 934 } 935 ; 936 937 enum_spec: 938 enum enum_tag { 939 $$ = mktag($2, ENUM, false, false); 940 } 941 | enum enum_tag { 942 dcs->d_tagtyp = mktag($2, ENUM, true, false); 943 } enum_declaration { 944 $$ = complete_tag_enum(dcs->d_tagtyp, $4); 945 } 946 | enum { 947 dcs->d_tagtyp = mktag(NULL, ENUM, true, false); 948 } enum_declaration { 949 $$ = complete_tag_enum(dcs->d_tagtyp, $3); 950 } 951 | enum error { 952 symtyp = FVFT; 953 $$ = gettyp(INT); 954 } 955 ; 956 957 enum: 958 T_ENUM { 959 symtyp = FTAG; 960 begin_declaration_level(CTCONST); 961 } 962 ; 963 964 enum_tag: 965 identifier { 966 $$ = getsym($1); 967 } 968 ; 969 970 enum_declaration: 971 enum_decl_lbrace enums_with_opt_comma T_RBRACE { 972 $$ = $2; 973 } 974 ; 975 976 enum_decl_lbrace: 977 T_LBRACE { 978 symtyp = FVFT; 979 enumval = 0; 980 } 981 ; 982 983 enums_with_opt_comma: 984 enums { 985 $$ = $1; 986 } 987 | enums T_COMMA { 988 if (sflag) { 989 /* trailing ',' prohibited in enum declaration */ 990 error(54); 991 } else { 992 /* trailing ',' prohibited in enum declaration */ 993 c99ism(54); 994 } 995 $$ = $1; 996 } 997 ; 998 999 enums: 1000 enumerator { 1001 $$ = $1; 1002 } 1003 | enums T_COMMA enumerator { 1004 $$ = lnklst($1, $3); 1005 } 1006 | error { 1007 $$ = NULL; 1008 } 1009 ; 1010 1011 enumerator: 1012 enumeration_constant { 1013 $$ = enumeration_constant($1, enumval, true); 1014 } 1015 | enumeration_constant T_ASSIGN constant_expr { 1016 $$ = enumeration_constant($1, to_int_constant($3, true), false); 1017 } 1018 ; 1019 1020 enumeration_constant: /* C99 6.4.4.3 */ 1021 identifier { 1022 $$ = getsym($1); 1023 } 1024 ; 1025 1026 1027 notype_init_decls: 1028 notype_init_decl 1029 | notype_init_decls T_COMMA type_init_decl 1030 ; 1031 1032 type_init_decls: 1033 type_init_decl 1034 | type_init_decls T_COMMA type_init_decl 1035 ; 1036 1037 notype_init_decl: 1038 notype_decl opt_asm_or_symbolrename { 1039 cgram_declare($1, false, $2); 1040 check_size($1); 1041 } 1042 | notype_decl opt_asm_or_symbolrename { 1043 begin_initialization($1); 1044 cgram_declare($1, true, $2); 1045 } T_ASSIGN initializer { 1046 check_size($1); 1047 end_initialization(); 1048 } 1049 ; 1050 1051 type_init_decl: 1052 type_decl opt_asm_or_symbolrename { 1053 cgram_declare($1, false, $2); 1054 check_size($1); 1055 } 1056 | type_decl opt_asm_or_symbolrename { 1057 begin_initialization($1); 1058 cgram_declare($1, true, $2); 1059 } T_ASSIGN initializer { 1060 check_size($1); 1061 end_initialization(); 1062 } 1063 ; 1064 1065 notype_decl: 1066 notype_direct_decl { 1067 $$ = $1; 1068 } 1069 | pointer notype_direct_decl { 1070 $$ = add_pointer($2, $1); 1071 } 1072 ; 1073 1074 /* TODO: move below type_decl */ 1075 notype_direct_decl: 1076 T_NAME { 1077 $$ = declarator_name(getsym($1)); 1078 } 1079 | T_LPAREN type_decl T_RPAREN { 1080 $$ = $2; 1081 } 1082 | type_attribute notype_direct_decl { 1083 $$ = $2; 1084 } 1085 | notype_direct_decl T_LBRACK T_RBRACK { 1086 $$ = add_array($1, false, 0); 1087 } 1088 | notype_direct_decl T_LBRACK array_size T_RBRACK { 1089 $$ = add_array($1, true, to_int_constant($3, false)); 1090 } 1091 | notype_direct_decl param_list opt_asm_or_symbolrename { 1092 $$ = add_function(symbolrename($1, $3), $2); 1093 end_declaration_level(); 1094 block_level--; 1095 } 1096 | notype_direct_decl type_attribute_list 1097 /* TODO: either add { $$ = $1 } everywhere or remove it everywhere. */ 1098 ; 1099 1100 type_decl: 1101 type_direct_decl { 1102 $$ = $1; 1103 } 1104 | pointer type_direct_decl { 1105 $$ = add_pointer($2, $1); 1106 } 1107 ; 1108 1109 /* 1110 * TODO: document whether T_NAME here vs. identifier in notype_direct_decl 1111 * is on purpose. 1112 */ 1113 type_direct_decl: 1114 identifier { 1115 $$ = declarator_name(getsym($1)); 1116 } 1117 | T_LPAREN type_decl T_RPAREN { 1118 $$ = $2; 1119 } 1120 | type_attribute type_direct_decl { 1121 $$ = $2; 1122 } 1123 | type_direct_decl T_LBRACK T_RBRACK { 1124 $$ = add_array($1, false, 0); 1125 } 1126 | type_direct_decl T_LBRACK array_size T_RBRACK { 1127 $$ = add_array($1, true, to_int_constant($3, false)); 1128 } 1129 | type_direct_decl param_list opt_asm_or_symbolrename { 1130 $$ = add_function(symbolrename($1, $3), $2); 1131 end_declaration_level(); 1132 block_level--; 1133 } 1134 | type_direct_decl type_attribute_list 1135 ; 1136 1137 /* 1138 * param_decl and notype_param_decl exist to avoid a conflict in 1139 * argument lists. A typename enclosed in parens should always be 1140 * treated as a typename, not an argument. 1141 * "typedef int a; f(int (a));" is "typedef int a; f(int foo(a));" 1142 * not "typedef int a; f(int a);" 1143 */ 1144 param_decl: 1145 direct_param_decl { 1146 $$ = $1; 1147 } 1148 | pointer direct_param_decl { 1149 $$ = add_pointer($2, $1); 1150 } 1151 ; 1152 1153 /* TODO: consistently use 'opt' either as prefix or as suffix */ 1154 opt_type_qualifier_list: 1155 /* empty */ 1156 | type_qualifier_list 1157 ; 1158 1159 array_size: 1160 opt_type_qualifier_list T_SCLASS constant_expr { 1161 /* C11 6.7.6.3p7 */ 1162 if ($2 != STATIC) 1163 yyerror("Bad attribute"); 1164 /* static array size is a C11 extension */ 1165 c11ism(343); 1166 $$ = $3; 1167 } 1168 | constant_expr { 1169 $$ = $1; 1170 } 1171 ; 1172 1173 direct_param_decl: 1174 identifier type_attribute_list { 1175 $$ = declarator_name(getsym($1)); 1176 } 1177 | identifier { 1178 $$ = declarator_name(getsym($1)); 1179 } 1180 | T_LPAREN notype_param_decl T_RPAREN { 1181 $$ = $2; 1182 } 1183 | direct_param_decl T_LBRACK T_RBRACK { 1184 $$ = add_array($1, false, 0); 1185 } 1186 | direct_param_decl T_LBRACK array_size T_RBRACK { 1187 $$ = add_array($1, true, to_int_constant($3, false)); 1188 } 1189 | direct_param_decl param_list opt_asm_or_symbolrename { 1190 $$ = add_function(symbolrename($1, $3), $2); 1191 end_declaration_level(); 1192 block_level--; 1193 } 1194 ; 1195 1196 notype_param_decl: 1197 direct_notype_param_decl { 1198 $$ = $1; 1199 } 1200 | pointer direct_notype_param_decl { 1201 $$ = add_pointer($2, $1); 1202 } 1203 ; 1204 1205 direct_notype_param_decl: 1206 identifier { 1207 $$ = declarator_name(getsym($1)); 1208 } 1209 | T_LPAREN notype_param_decl T_RPAREN { 1210 $$ = $2; 1211 } 1212 | direct_notype_param_decl T_LBRACK T_RBRACK { 1213 $$ = add_array($1, false, 0); 1214 } 1215 | direct_notype_param_decl T_LBRACK array_size T_RBRACK { 1216 $$ = add_array($1, true, to_int_constant($3, false)); 1217 } 1218 | direct_notype_param_decl param_list opt_asm_or_symbolrename { 1219 $$ = add_function(symbolrename($1, $3), $2); 1220 end_declaration_level(); 1221 block_level--; 1222 } 1223 ; 1224 1225 /* TODO: rename 'pointer' to something less ambiguous, maybe 'pointer_level' */ 1226 pointer: 1227 asterisk { 1228 $$ = $1; 1229 } 1230 | asterisk type_qualifier_list { 1231 /* TODO: rename pqinf_t to be more expressive */ 1232 /* TODO: then rename the merge function */ 1233 $$ = merge_pointers_and_qualifiers($1, $2); 1234 } 1235 | asterisk pointer { 1236 $$ = merge_pointers_and_qualifiers($1, $2); 1237 } 1238 | asterisk type_qualifier_list pointer { 1239 $$ = merge_pointers_and_qualifiers($1, $2); 1240 $$ = merge_pointers_and_qualifiers($$, $3); 1241 } 1242 ; 1243 1244 asterisk: 1245 T_ASTERISK { 1246 $$ = xcalloc(1, sizeof(*$$)); 1247 $$->p_pointer = true; 1248 } 1249 ; 1250 1251 /* TODO: try whether type_qualifier_list_opt makes the code simpler */ 1252 type_qualifier_list: 1253 type_qualifier { 1254 $$ = $1; 1255 } 1256 | type_qualifier_list type_qualifier { 1257 $$ = merge_pointers_and_qualifiers($1, $2); 1258 } 1259 ; 1260 1261 type_qualifier: 1262 T_QUAL { 1263 $$ = xcalloc(1, sizeof(*$$)); 1264 if ($1 == CONST) { 1265 $$->p_const = true; 1266 } else if ($1 == VOLATILE) { 1267 $$->p_volatile = true; 1268 } else { 1269 lint_assert($1 == RESTRICT || $1 == THREAD); 1270 } 1271 } 1272 ; 1273 1274 param_list: 1275 id_list_lparen identifier_list T_RPAREN { 1276 $$ = $2; 1277 } 1278 | abstract_decl_param_list { 1279 $$ = $1; 1280 } 1281 ; 1282 1283 id_list_lparen: 1284 T_LPAREN { 1285 block_level++; 1286 begin_declaration_level(PROTO_ARG); 1287 } 1288 ; 1289 1290 identifier_list: 1291 T_NAME { 1292 $$ = old_style_function_name(getsym($1)); 1293 } 1294 | identifier_list T_COMMA T_NAME { 1295 $$ = lnklst($1, old_style_function_name(getsym($3))); 1296 } 1297 | identifier_list error { 1298 $$ = $1; 1299 } 1300 ; 1301 1302 abstract_decl_param_list: 1303 abstract_decl_lparen T_RPAREN opt_type_attribute { 1304 $$ = NULL; 1305 } 1306 | abstract_decl_lparen vararg_parameter_type_list T_RPAREN opt_type_attribute { 1307 dcs->d_proto = true; 1308 $$ = $2; 1309 } 1310 | abstract_decl_lparen error T_RPAREN opt_type_attribute { 1311 $$ = NULL; 1312 } 1313 ; 1314 1315 abstract_decl_lparen: 1316 T_LPAREN { 1317 block_level++; 1318 begin_declaration_level(PROTO_ARG); 1319 } 1320 ; 1321 1322 vararg_parameter_type_list: 1323 parameter_type_list { 1324 $$ = $1; 1325 } 1326 | parameter_type_list T_COMMA T_ELLIPSIS { 1327 dcs->d_vararg = true; 1328 $$ = $1; 1329 } 1330 | T_ELLIPSIS { 1331 if (sflag) { 1332 /* ANSI C requires formal parameter before '...' */ 1333 error(84); 1334 } else if (!tflag) { 1335 /* ANSI C requires formal parameter before '...' */ 1336 warning(84); 1337 } 1338 dcs->d_vararg = true; 1339 $$ = NULL; 1340 } 1341 ; 1342 1343 parameter_type_list: 1344 parameter_declaration { 1345 $$ = $1; 1346 } 1347 | parameter_type_list T_COMMA parameter_declaration { 1348 $$ = lnklst($1, $3); 1349 } 1350 ; 1351 1352 parameter_declaration: 1353 declmods deftyp { 1354 $$ = declare_argument(abstract_name(), false); 1355 } 1356 | declaration_specifiers deftyp { 1357 $$ = declare_argument(abstract_name(), false); 1358 } 1359 | declmods deftyp notype_param_decl { 1360 $$ = declare_argument($3, false); 1361 } 1362 /* 1363 * param_decl is needed because of following conflict: 1364 * "typedef int a; f(int (a));" could be parsed as 1365 * "function with argument a of type int", or 1366 * "function with an abstract argument of type function". 1367 * This grammar realizes the second case. 1368 */ 1369 | declaration_specifiers deftyp param_decl { 1370 $$ = declare_argument($3, false); 1371 } 1372 | declmods deftyp abstract_decl { 1373 $$ = declare_argument($3, false); 1374 } 1375 | declaration_specifiers deftyp abstract_decl { 1376 $$ = declare_argument($3, false); 1377 } 1378 ; 1379 1380 opt_asm_or_symbolrename: /* expect only one */ 1381 /* empty */ { 1382 $$ = NULL; 1383 } 1384 | T_ASM T_LPAREN T_STRING T_RPAREN { 1385 freeyyv(&$3, T_STRING); 1386 $$ = NULL; 1387 } 1388 | T_SYMBOLRENAME T_LPAREN T_NAME T_RPAREN { 1389 $$ = $3; 1390 } 1391 ; 1392 1393 initializer: /* C99 6.7.8 "Initialization" */ 1394 expr %prec T_COMMA { 1395 init_expr($1); 1396 } 1397 | init_lbrace init_rbrace { 1398 /* XXX: Empty braces are not covered by C99 6.7.8. */ 1399 } 1400 | init_lbrace initializer_list comma_opt init_rbrace 1401 | error 1402 ; 1403 1404 initializer_list: /* C99 6.7.8 "Initialization" */ 1405 initializer_list_item 1406 | initializer_list T_COMMA initializer_list_item 1407 ; 1408 1409 initializer_list_item: 1410 designation initializer 1411 | initializer 1412 ; 1413 1414 range: 1415 constant_expr { 1416 $$.lo = to_int_constant($1, true); 1417 $$.hi = $$.lo; 1418 } 1419 | constant_expr T_ELLIPSIS constant_expr { 1420 $$.lo = to_int_constant($1, true); 1421 $$.hi = to_int_constant($3, true); 1422 /* initialization with '[a...b]' is a GNU extension */ 1423 gnuism(340); 1424 } 1425 ; 1426 1427 designator: /* C99 6.7.8 "Initialization" */ 1428 T_LBRACK range T_RBRACK { 1429 add_designator_subscript($2); 1430 if (!Sflag) 1431 /* array initializer with des.s is a C9X feature */ 1432 warning(321); 1433 } 1434 | T_POINT identifier { 1435 if (!Sflag) 1436 /* struct or union member name in initializer is ... */ 1437 warning(313); 1438 add_designator_member($2); 1439 } 1440 ; 1441 1442 designator_list: /* C99 6.7.8 "Initialization" */ 1443 designator 1444 | designator_list designator 1445 ; 1446 1447 /* TODO: order from big to small */ 1448 designation: /* C99 6.7.8 "Initialization" */ 1449 designator_list T_ASSIGN 1450 | identifier T_COLON { 1451 /* GCC style struct or union member name in initializer */ 1452 gnuism(315); 1453 add_designator_member($1); 1454 } 1455 ; 1456 1457 init_lbrace: 1458 T_LBRACE { 1459 init_lbrace(); 1460 } 1461 ; 1462 1463 init_rbrace: 1464 T_RBRACE { 1465 init_rbrace(); 1466 } 1467 ; 1468 1469 type_name: 1470 { 1471 begin_declaration_level(ABSTRACT); 1472 } abstract_declaration { 1473 end_declaration_level(); 1474 $$ = $2->s_type; 1475 } 1476 ; 1477 1478 abstract_declaration: 1479 noclass_declmods deftyp { 1480 $$ = declare_1_abstract(abstract_name()); 1481 } 1482 | noclass_declspecs deftyp { 1483 $$ = declare_1_abstract(abstract_name()); 1484 } 1485 | noclass_declmods deftyp abstract_decl { 1486 $$ = declare_1_abstract($3); 1487 } 1488 | noclass_declspecs deftyp abstract_decl { 1489 $$ = declare_1_abstract($3); 1490 } 1491 ; 1492 1493 /* TODO: abstract_declaration and abstract_decl sound too similar */ 1494 abstract_decl: 1495 pointer { 1496 $$ = add_pointer(abstract_name(), $1); 1497 } 1498 | direct_abstract_decl { 1499 $$ = $1; 1500 } 1501 | pointer direct_abstract_decl { 1502 $$ = add_pointer($2, $1); 1503 } 1504 | T_TYPEOF term { 1505 $$ = mktempsym($2->tn_type); 1506 } 1507 ; 1508 1509 direct_abstract_decl: 1510 T_LPAREN abstract_decl T_RPAREN { 1511 $$ = $2; 1512 } 1513 | T_LBRACK T_RBRACK { 1514 $$ = add_array(abstract_name(), false, 0); 1515 } 1516 | T_LBRACK array_size T_RBRACK { 1517 $$ = add_array(abstract_name(), true, to_int_constant($2, false)); 1518 } 1519 | type_attribute direct_abstract_decl { 1520 $$ = $2; 1521 } 1522 | direct_abstract_decl T_LBRACK T_RBRACK { 1523 $$ = add_array($1, false, 0); 1524 } 1525 | direct_abstract_decl T_LBRACK array_size T_RBRACK { 1526 $$ = add_array($1, true, to_int_constant($3, false)); 1527 } 1528 | abstract_decl_param_list opt_asm_or_symbolrename { 1529 $$ = add_function(symbolrename(abstract_name(), $2), $1); 1530 end_declaration_level(); 1531 block_level--; 1532 } 1533 | direct_abstract_decl abstract_decl_param_list opt_asm_or_symbolrename { 1534 $$ = add_function(symbolrename($1, $3), $2); 1535 end_declaration_level(); 1536 block_level--; 1537 } 1538 | direct_abstract_decl type_attribute_list 1539 ; 1540 1541 non_expr_statement: 1542 type_attribute T_SEMI 1543 | labeled_statement 1544 | compound_statement 1545 | selection_statement 1546 | iteration_statement 1547 | jump_statement { 1548 seen_fallthrough = false; 1549 } 1550 | asm_statement 1551 ; 1552 1553 statement: /* C99 6.8 */ 1554 expr_statement 1555 | non_expr_statement 1556 ; 1557 1558 labeled_statement: /* C99 6.8.1 */ 1559 label opt_type_attribute statement 1560 ; 1561 1562 label: 1563 T_NAME T_COLON { 1564 symtyp = FLABEL; 1565 named_label(getsym($1)); 1566 } 1567 | T_CASE constant_expr T_COLON { 1568 case_label($2); 1569 seen_fallthrough = true; 1570 } 1571 | T_CASE constant_expr T_ELLIPSIS constant_expr T_COLON { 1572 /* XXX: We don't fill all cases */ 1573 case_label($2); 1574 seen_fallthrough = true; 1575 } 1576 | T_DEFAULT T_COLON { 1577 default_label(); 1578 seen_fallthrough = true; 1579 } 1580 ; 1581 1582 compound_statement: /* C99 6.8.2 */ 1583 compound_statement_lbrace compound_statement_rbrace 1584 | compound_statement_lbrace block_item_list compound_statement_rbrace 1585 ; 1586 1587 compound_statement_lbrace: 1588 T_LBRACE { 1589 block_level++; 1590 mem_block_level++; 1591 begin_declaration_level(AUTO); 1592 } 1593 ; 1594 1595 compound_statement_rbrace: 1596 T_RBRACE { 1597 end_declaration_level(); 1598 freeblk(); 1599 mem_block_level--; 1600 block_level--; 1601 seen_fallthrough = false; 1602 } 1603 ; 1604 1605 block_item_list: 1606 block_item 1607 | block_item_list block_item { 1608 if (!Sflag && $1 && !$2) 1609 /* declarations after statements is a C99 feature */ 1610 c99ism(327); 1611 $$ = $1 || $2; 1612 } 1613 ; 1614 1615 block_item: 1616 statement { 1617 $$ = true; 1618 restore_warning_flags(); 1619 } 1620 | declaration { 1621 $$ = false; 1622 restore_warning_flags(); 1623 } 1624 ; 1625 1626 expr_statement: 1627 expr T_SEMI { 1628 expr($1, false, false, false, false); 1629 seen_fallthrough = false; 1630 } 1631 | T_SEMI { 1632 seen_fallthrough = false; 1633 } 1634 ; 1635 1636 selection_statement: /* C99 6.8.4 */ 1637 if_without_else { 1638 save_warning_flags(); 1639 if2(); 1640 if3(false); 1641 } 1642 | if_without_else T_ELSE { 1643 save_warning_flags(); 1644 if2(); 1645 } statement { 1646 clear_warning_flags(); 1647 if3(true); 1648 } 1649 | if_without_else T_ELSE error { 1650 clear_warning_flags(); 1651 if3(false); 1652 } 1653 | switch_expr statement { 1654 clear_warning_flags(); 1655 switch2(); 1656 } 1657 | switch_expr error { 1658 clear_warning_flags(); 1659 switch2(); 1660 } 1661 ; 1662 1663 if_without_else: 1664 if_expr statement 1665 | if_expr error 1666 ; 1667 1668 if_expr: 1669 T_IF T_LPAREN expr T_RPAREN { 1670 if1($3); 1671 clear_warning_flags(); 1672 } 1673 ; 1674 1675 switch_expr: 1676 T_SWITCH T_LPAREN expr T_RPAREN { 1677 switch1($3); 1678 clear_warning_flags(); 1679 } 1680 ; 1681 1682 /* TODO: C11 6.5.1.1 says "assignment-expression", not plain "expr". */ 1683 /* TODO: c11ism */ 1684 generic_selection: /* C11 6.5.1.1 */ 1685 T_GENERIC T_LPAREN expr T_COMMA generic_assoc_list T_RPAREN { 1686 /* generic selection requires C11 or later */ 1687 c11ism(345); 1688 $$ = $3; 1689 } 1690 ; 1691 1692 generic_assoc_list: /* C11 6.5.1.1 */ 1693 generic_association 1694 | generic_assoc_list T_COMMA generic_association 1695 ; 1696 1697 generic_association: /* C11 6.5.1.1 */ 1698 type_name T_COLON expr 1699 | T_DEFAULT T_COLON expr 1700 ; 1701 1702 do_statement: /* C99 6.8.5 */ 1703 do statement { 1704 clear_warning_flags(); 1705 } 1706 ; 1707 1708 iteration_statement: /* C99 6.8.5 */ 1709 while_expr statement { 1710 clear_warning_flags(); 1711 while2(); 1712 } 1713 | while_expr error { 1714 clear_warning_flags(); 1715 while2(); 1716 } 1717 | do_statement do_while_expr { 1718 do2($2); 1719 seen_fallthrough = false; 1720 } 1721 | do error { 1722 clear_warning_flags(); 1723 do2(NULL); 1724 } 1725 | for_exprs statement { 1726 clear_warning_flags(); 1727 for2(); 1728 end_declaration_level(); 1729 block_level--; 1730 } 1731 | for_exprs error { 1732 clear_warning_flags(); 1733 for2(); 1734 end_declaration_level(); 1735 block_level--; 1736 } 1737 ; 1738 1739 while_expr: 1740 T_WHILE T_LPAREN expr T_RPAREN { 1741 while1($3); 1742 clear_warning_flags(); 1743 } 1744 ; 1745 1746 do: 1747 T_DO { 1748 do1(); 1749 } 1750 ; 1751 1752 do_while_expr: 1753 T_WHILE T_LPAREN expr T_RPAREN T_SEMI { 1754 $$ = $3; 1755 } 1756 ; 1757 1758 for_start: 1759 T_FOR T_LPAREN { 1760 begin_declaration_level(AUTO); 1761 block_level++; 1762 } 1763 ; 1764 for_exprs: 1765 for_start declaration_specifiers deftyp notype_init_decls T_SEMI 1766 opt_expr T_SEMI opt_expr T_RPAREN { 1767 /* variable declaration in for loop */ 1768 c99ism(325); 1769 for1(NULL, $6, $8); 1770 clear_warning_flags(); 1771 } 1772 | for_start opt_expr T_SEMI opt_expr T_SEMI opt_expr T_RPAREN { 1773 for1($2, $4, $6); 1774 clear_warning_flags(); 1775 } 1776 ; 1777 1778 opt_expr: 1779 /* empty */ { 1780 $$ = NULL; 1781 } 1782 | expr { 1783 $$ = $1; 1784 } 1785 ; 1786 1787 jump_statement: /* C99 6.8.6 */ 1788 goto identifier T_SEMI { 1789 do_goto(getsym($2)); 1790 } 1791 | goto error T_SEMI { 1792 symtyp = FVFT; 1793 } 1794 | T_CONTINUE T_SEMI { 1795 do_continue(); 1796 } 1797 | T_BREAK T_SEMI { 1798 do_break(); 1799 } 1800 | T_RETURN T_SEMI { 1801 do_return(NULL); 1802 } 1803 | T_RETURN expr T_SEMI { 1804 do_return($2); 1805 } 1806 ; 1807 1808 goto: 1809 T_GOTO { 1810 symtyp = FLABEL; 1811 } 1812 ; 1813 1814 asm_statement: 1815 T_ASM T_LPAREN read_until_rparen T_SEMI { 1816 setasm(); 1817 } 1818 | T_ASM T_QUAL T_LPAREN read_until_rparen T_SEMI { 1819 setasm(); 1820 } 1821 | T_ASM error 1822 ; 1823 1824 read_until_rparen: 1825 /* empty */ { 1826 ignore_up_to_rparen(); 1827 } 1828 ; 1829 1830 constant_expr_list_opt: 1831 /* empty */ 1832 | constant_expr_list 1833 ; 1834 1835 constant_expr_list: 1836 constant_expr 1837 | constant_expr_list T_COMMA constant_expr 1838 ; 1839 1840 constant_expr: /* C99 6.6 */ 1841 expr %prec T_ASSIGN { 1842 $$ = $1; 1843 } 1844 ; 1845 1846 expr: 1847 expr T_ASTERISK expr { 1848 $$ = build(MULT, $1, $3); 1849 } 1850 | expr T_MULTIPLICATIVE expr { 1851 $$ = build($2, $1, $3); 1852 } 1853 | expr T_ADDITIVE expr { 1854 $$ = build($2, $1, $3); 1855 } 1856 | expr T_SHIFT expr { 1857 $$ = build($2, $1, $3); 1858 } 1859 | expr T_RELATIONAL expr { 1860 $$ = build($2, $1, $3); 1861 } 1862 | expr T_EQUALITY expr { 1863 $$ = build($2, $1, $3); 1864 } 1865 | expr T_AMPER expr { 1866 $$ = build(BITAND, $1, $3); 1867 } 1868 | expr T_BITXOR expr { 1869 $$ = build(BITXOR, $1, $3); 1870 } 1871 | expr T_BITOR expr { 1872 $$ = build(BITOR, $1, $3); 1873 } 1874 | expr T_LOGAND expr { 1875 $$ = build(LOGAND, $1, $3); 1876 } 1877 | expr T_LOGOR expr { 1878 $$ = build(LOGOR, $1, $3); 1879 } 1880 | expr T_QUEST expr T_COLON expr { 1881 $$ = build(QUEST, $1, build(COLON, $3, $5)); 1882 } 1883 | expr T_ASSIGN expr { 1884 $$ = build(ASSIGN, $1, $3); 1885 } 1886 | expr T_OPASSIGN expr { 1887 $$ = build($2, $1, $3); 1888 } 1889 | expr T_COMMA expr { 1890 $$ = build(COMMA, $1, $3); 1891 } 1892 | term { 1893 $$ = $1; 1894 } 1895 | generic_selection { 1896 $$ = $1; 1897 } 1898 ; 1899 1900 term: 1901 T_NAME { 1902 /* XXX really necessary? */ 1903 if (yychar < 0) 1904 yychar = yylex(); 1905 $$ = new_name_node(getsym($1), yychar); 1906 } 1907 | string { 1908 $$ = new_string_node($1); 1909 } 1910 | T_CON { 1911 $$ = expr_new_constant(gettyp($1->v_tspec), $1); 1912 } 1913 | T_LPAREN expr T_RPAREN { 1914 if ($2 != NULL) 1915 $2->tn_parenthesized = true; 1916 $$ = $2; 1917 } 1918 | T_LPAREN compound_statement_lbrace gcc_statement_expr_list { 1919 block_level--; 1920 mem_block_level--; 1921 begin_initialization(mktempsym(dup_type($3->tn_type))); 1922 mem_block_level++; 1923 block_level++; 1924 /* ({ }) is a GCC extension */ 1925 gnuism(320); 1926 } compound_statement_rbrace T_RPAREN { 1927 $$ = new_name_node(*current_initsym(), 0); 1928 end_initialization(); 1929 } 1930 | term T_INCDEC { 1931 $$ = build($2 == INC ? INCAFT : DECAFT, $1, NULL); 1932 } 1933 | T_INCDEC term { 1934 $$ = build($1 == INC ? INCBEF : DECBEF, $2, NULL); 1935 } 1936 | T_ASTERISK term { 1937 $$ = build(INDIR, $2, NULL); 1938 } 1939 | T_AMPER term { 1940 $$ = build(ADDR, $2, NULL); 1941 } 1942 | T_UNARY term { 1943 $$ = build($1, $2, NULL); 1944 } 1945 | T_ADDITIVE term { 1946 if (tflag && $1 == PLUS) { 1947 /* unary + is illegal in traditional C */ 1948 warning(100); 1949 } 1950 $$ = build($1 == PLUS ? UPLUS : UMINUS, $2, NULL); 1951 } 1952 | term T_LBRACK expr T_RBRACK { 1953 $$ = build(INDIR, build(PLUS, $1, $3), NULL); 1954 } 1955 | term T_LPAREN T_RPAREN { 1956 $$ = new_function_call_node($1, NULL); 1957 } 1958 | term T_LPAREN func_arg_list T_RPAREN { 1959 $$ = new_function_call_node($1, $3); 1960 } 1961 | term point_or_arrow T_NAME { 1962 if ($1 != NULL) { 1963 sym_t *msym; 1964 /* 1965 * XXX struct_or_union_member should be integrated 1966 * in build() 1967 */ 1968 if ($2 == ARROW) { 1969 /* 1970 * must do this before struct_or_union_member 1971 * is called 1972 */ 1973 $1 = cconv($1); 1974 } 1975 msym = struct_or_union_member($1, $2, getsym($3)); 1976 $$ = build($2, $1, new_name_node(msym, 0)); 1977 } else { 1978 $$ = NULL; 1979 } 1980 } 1981 | T_REAL term { 1982 $$ = build(REAL, $2, NULL); 1983 } 1984 | T_IMAG term { 1985 $$ = build(IMAG, $2, NULL); 1986 } 1987 | T_EXTENSION term { 1988 $$ = $2; 1989 } 1990 | T_REAL T_LPAREN term T_RPAREN { 1991 $$ = build(REAL, $3, NULL); 1992 } 1993 | T_IMAG T_LPAREN term T_RPAREN { 1994 $$ = build(IMAG, $3, NULL); 1995 } 1996 | T_BUILTIN_OFFSETOF T_LPAREN type_name T_COMMA identifier T_RPAREN { 1997 symtyp = FMEMBER; 1998 $$ = build_offsetof($3, getsym($5)); 1999 } 2000 | T_SIZEOF term { 2001 $$ = $2 == NULL ? NULL : build_sizeof($2->tn_type); 2002 if ($$ != NULL) 2003 check_expr_misc($2, false, false, false, false, false, true); 2004 } 2005 | T_SIZEOF T_LPAREN type_name T_RPAREN %prec T_SIZEOF { 2006 $$ = build_sizeof($3); 2007 } 2008 | T_ALIGNOF T_LPAREN type_name T_RPAREN { 2009 $$ = build_alignof($3); 2010 } 2011 | T_LPAREN type_name T_RPAREN term %prec T_UNARY { 2012 $$ = cast($4, $2); 2013 } 2014 | T_LPAREN type_name T_RPAREN { /* C99 6.5.2.5 "Compound literals" */ 2015 sym_t *tmp = mktempsym($2); 2016 begin_initialization(tmp); 2017 cgram_declare(tmp, true, NULL); 2018 } init_lbrace initializer_list comma_opt init_rbrace { 2019 if (!Sflag) 2020 /* compound literals are a C9X/GCC extension */ 2021 gnuism(319); 2022 $$ = new_name_node(*current_initsym(), 0); 2023 end_initialization(); 2024 } 2025 ; 2026 2027 /* 2028 * The inner part of a GCC statement-expression of the form ({ ... }). 2029 * 2030 * https://gcc.gnu.org/onlinedocs/gcc/Statement-Exprs.html 2031 */ 2032 gcc_statement_expr_list: 2033 gcc_statement_expr_item 2034 | gcc_statement_expr_list gcc_statement_expr_item { 2035 $$ = $2; 2036 } 2037 ; 2038 2039 gcc_statement_expr_item: 2040 declaration { 2041 clear_warning_flags(); 2042 $$ = NULL; 2043 } 2044 | non_expr_statement { 2045 $$ = expr_zalloc_tnode(); 2046 $$->tn_type = gettyp(VOID); 2047 } 2048 | expr T_SEMI { 2049 if ($1 == NULL) { /* in case of syntax errors */ 2050 $$ = expr_zalloc_tnode(); 2051 $$->tn_type = gettyp(VOID); 2052 } else { 2053 /* XXX: do that only on the last name */ 2054 if ($1->tn_op == NAME) 2055 $1->tn_sym->s_used = true; 2056 $$ = $1; 2057 expr($1, false, false, false, false); 2058 seen_fallthrough = false; 2059 } 2060 } 2061 ; 2062 2063 string: 2064 T_STRING { 2065 $$ = $1; 2066 } 2067 | T_STRING string2 { 2068 $$ = cat_strings($1, $2); 2069 } 2070 ; 2071 2072 string2: 2073 T_STRING { 2074 if (tflag) { 2075 /* concatenated strings are illegal in traditional C */ 2076 warning(219); 2077 } 2078 $$ = $1; 2079 } 2080 | string2 T_STRING { 2081 $$ = cat_strings($1, $2); 2082 } 2083 ; 2084 2085 func_arg_list: 2086 expr %prec T_COMMA { 2087 $$ = new_function_argument_node(NULL, $1); 2088 } 2089 | func_arg_list T_COMMA expr { 2090 $$ = new_function_argument_node($1, $3); 2091 } 2092 ; 2093 2094 point_or_arrow: 2095 T_POINT { 2096 symtyp = FMEMBER; 2097 $$ = POINT; 2098 } 2099 | T_ARROW { 2100 symtyp = FMEMBER; 2101 $$ = ARROW; 2102 } 2103 ; 2104 2105 identifier: /* C99 6.4.2.1 */ 2106 T_NAME { 2107 $$ = $1; 2108 cgram_debug("name '%s'", $$->sb_name); 2109 } 2110 | T_TYPENAME { 2111 $$ = $1; 2112 cgram_debug("typename '%s'", $$->sb_name); 2113 } 2114 ; 2115 2116 comma_opt: 2117 T_COMMA 2118 | /* empty */ 2119 ; 2120 %% 2121 2122 /* ARGSUSED */ 2123 int 2124 yyerror(const char *msg) 2125 { 2126 /* syntax error '%s' */ 2127 error(249, yytext); 2128 if (++sytxerr >= 5) 2129 norecover(); 2130 return 0; 2131 } 2132 2133 static void 2134 cgram_declare(sym_t *decl, bool initflg, sbuf_t *renaming) 2135 { 2136 declare(decl, initflg, renaming); 2137 if (renaming != NULL) 2138 freeyyv(&renaming, T_NAME); 2139 } 2140 2141 /* 2142 * Discard all input tokens up to and including the next 2143 * unmatched right paren 2144 */ 2145 static void 2146 ignore_up_to_rparen(void) 2147 { 2148 int level; 2149 2150 if (yychar < 0) 2151 yychar = yylex(); 2152 freeyyv(&yylval, yychar); 2153 2154 level = 1; 2155 while (yychar != T_RPAREN || --level > 0) { 2156 if (yychar == T_LPAREN) { 2157 level++; 2158 } else if (yychar <= 0) { 2159 break; 2160 } 2161 freeyyv(&yylval, yychar = yylex()); 2162 } 2163 2164 yyclearin; 2165 } 2166 2167 static sym_t * 2168 symbolrename(sym_t *s, sbuf_t *sb) 2169 { 2170 if (sb != NULL) 2171 s->s_rename = sb->sb_name; 2172 return s; 2173 } 2174
Indexes created Thu Oct 02 07:10:07 GMT 2025