cgram.y revision 1.237
1 %{ 2 /* $NetBSD: cgram.y,v 1.237 2021/06/27 20:47:13 rillig Exp $ */ 3 4 /* 5 * Copyright (c) 1996 Christopher G. Demetriou. All Rights Reserved. 6 * Copyright (c) 1994, 1995 Jochen Pohl 7 * All Rights Reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. All advertising materials mentioning features or use of this software 18 * must display the following acknowledgement: 19 * This product includes software developed by Jochen Pohl for 20 * The NetBSD Project. 21 * 4. The name of the author may not be used to endorse or promote products 22 * derived from this software without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 25 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 26 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 27 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 28 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 29 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 30 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 31 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 32 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 33 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 34 */ 35 36 #include <sys/cdefs.h> 37 #if defined(__RCSID) && !defined(lint) 38 __RCSID("$NetBSD: cgram.y,v 1.237 2021/06/27 20:47:13 rillig Exp $"); 39 #endif 40 41 #include <limits.h> 42 #include <stdlib.h> 43 #include <string.h> 44 45 #include "lint1.h" 46 47 extern char *yytext; 48 49 /* 50 * Contains the level of current declaration, used for symbol table entries. 51 * 0 is the top-level, > 0 is inside a function body. 52 */ 53 int block_level; 54 55 /* 56 * level for memory allocation. Normally the same as block_level. 57 * An exception is the declaration of arguments in prototypes. Memory 58 * for these can't be freed after the declaration, but symbols must 59 * be removed from the symbol table after the declaration. 60 */ 61 int mem_block_level; 62 63 /* 64 * Save the no-warns state and restore it to avoid the problem where 65 * if (expr) { stmt } / * NOLINT * / stmt; 66 */ 67 static int olwarn = LWARN_BAD; 68 69 static void cgram_declare(sym_t *, bool, sbuf_t *); 70 static void ignore_up_to_rparen(void); 71 static sym_t *symbolrename(sym_t *, sbuf_t *); 72 73 74 #ifdef DEBUG 75 static void 76 CLEAR_WARN_FLAGS(const char *file, size_t line) 77 { 78 printf("%s:%d: %s:%zu: clearing flags\n", 79 curr_pos.p_file, curr_pos.p_line, file, line); 80 clear_warn_flags(); 81 olwarn = LWARN_BAD; 82 } 83 84 static void 85 SAVE_WARN_FLAGS(const char *file, size_t line) 86 { 87 lint_assert(olwarn == LWARN_BAD); 88 printf("%s:%d: %s:%zu: saving flags %d\n", 89 curr_pos.p_file, curr_pos.p_line, file, line, lwarn); 90 olwarn = lwarn; 91 } 92 93 static void 94 RESTORE_WARN_FLAGS(const char *file, size_t line) 95 { 96 if (olwarn != LWARN_BAD) { 97 lwarn = olwarn; 98 printf("%s:%d: %s:%zu: restoring flags %d\n", 99 curr_pos.p_file, curr_pos.p_line, file, line, lwarn); 100 olwarn = LWARN_BAD; 101 } else 102 CLEAR_WARN_FLAGS(file, line); 103 } 104 #define cgram_debug(fmt, args...) printf("cgram_debug: " fmt "\n", ##args) 105 #else 106 #define CLEAR_WARN_FLAGS(f, l) clear_warn_flags(), olwarn = LWARN_BAD 107 #define SAVE_WARN_FLAGS(f, l) olwarn = lwarn 108 #define RESTORE_WARN_FLAGS(f, l) \ 109 (void)(olwarn == LWARN_BAD ? (clear_warn_flags(), 0) : (lwarn = olwarn)) 110 #define cgram_debug(fmt, args...) do { } while (false) 111 #endif 112 113 #define clear_warning_flags() CLEAR_WARN_FLAGS(__FILE__, __LINE__) 114 #define save_warning_flags() SAVE_WARN_FLAGS(__FILE__, __LINE__) 115 #define restore_warning_flags() RESTORE_WARN_FLAGS(__FILE__, __LINE__) 116 117 /* unbind the anonymous struct members from the struct */ 118 static void 119 anonymize(sym_t *s) 120 { 121 for ( ; s != NULL; s = s->s_next) 122 s->s_styp = NULL; 123 } 124 %} 125 126 %expect 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> gcc_statement_expr_list 327 %type <y_tnode> gcc_statement_expr_item 328 %type <y_tnode> term 329 %type <y_tnode> generic_selection 330 %type <y_tnode> func_arg_list 331 %type <y_op> point_or_arrow 332 %type <y_type> type_name 333 %type <y_sym> abstract_declaration 334 %type <y_tnode> do_while_expr 335 %type <y_tnode> opt_expr 336 %type <y_string> string 337 %type <y_string> string2 338 %type <y_sb> opt_asm_or_symbolrename 339 %type <y_range> range 340 %type <y_seen_statement> block_item_list 341 %type <y_seen_statement> block_item 342 %type <y_types> generic_assoc_list 343 %type <y_types> generic_association 344 345 346 %% 347 348 program: 349 /* empty */ { 350 if (sflag) { 351 /* empty translation unit */ 352 error(272); 353 } else if (!tflag) { 354 /* empty translation unit */ 355 warning(272); 356 } 357 } 358 | translation_unit 359 ; 360 361 translation_unit: /* C99 6.9 */ 362 external_declaration 363 | translation_unit external_declaration 364 ; 365 366 external_declaration: /* C99 6.9 */ 367 asm_statement 368 | function_definition { 369 global_clean_up_decl(false); 370 clear_warning_flags(); 371 } 372 | top_level_declaration { 373 global_clean_up_decl(false); 374 clear_warning_flags(); 375 } 376 ; 377 378 /* 379 * On the top level, lint allows several forms of declarations that it doesn't 380 * allow in functions. For example, a single ';' is an empty declaration and 381 * is supported by some compilers, but in a function it would be an empty 382 * statement, not a declaration. This makes a difference in C90 mode, where 383 * a statement must not be followed by a declaration. 384 * 385 * See 'declaration' for all other declarations. 386 */ 387 top_level_declaration: /* C99 6.9 calls this 'declaration' */ 388 T_SEMI { 389 if (sflag) { 390 /* empty declaration */ 391 error(0); 392 } else if (!tflag) { 393 /* empty declaration */ 394 warning(0); 395 } 396 } 397 | clrtyp deftyp notype_init_decls T_SEMI { 398 if (sflag) { 399 /* old style declaration; add 'int' */ 400 error(1); 401 } else if (!tflag) { 402 /* old style declaration; add 'int' */ 403 warning(1); 404 } 405 } 406 | declmods deftyp T_SEMI { 407 if (dcs->d_scl == TYPEDEF) { 408 /* typedef declares no type name */ 409 warning(72); 410 } else { 411 /* empty declaration */ 412 warning(2); 413 } 414 } 415 | declmods deftyp notype_init_decls T_SEMI 416 | declaration_specifiers deftyp T_SEMI { 417 if (dcs->d_scl == TYPEDEF) { 418 /* typedef declares no type name */ 419 warning(72); 420 } else if (!dcs->d_nonempty_decl) { 421 /* empty declaration */ 422 warning(2); 423 } 424 } 425 | declaration_specifiers deftyp type_init_decls T_SEMI 426 | error T_SEMI { 427 global_clean_up(); 428 } 429 | error T_RBRACE { 430 global_clean_up(); 431 } 432 ; 433 434 function_definition: /* C99 6.9.1 */ 435 func_decl { 436 if ($1->s_type->t_tspec != FUNC) { 437 /* syntax error '%s' */ 438 error(249, yytext); 439 YYERROR; 440 } 441 if ($1->s_type->t_typedef) { 442 /* ()-less function definition */ 443 error(64); 444 YYERROR; 445 } 446 funcdef($1); 447 block_level++; 448 begin_declaration_level(ARG); 449 if (lwarn == LWARN_NONE) 450 $1->s_used = true; 451 } arg_declaration_list_opt { 452 end_declaration_level(); 453 block_level--; 454 check_func_lint_directives(); 455 check_func_old_style_arguments(); 456 begin_control_statement(CS_FUNCTION_BODY); 457 } compound_statement { 458 funcend(); 459 end_control_statement(CS_FUNCTION_BODY); 460 } 461 ; 462 463 func_decl: 464 clrtyp deftyp notype_decl { 465 $$ = $3; 466 } 467 | declmods deftyp notype_decl { 468 $$ = $3; 469 } 470 | declaration_specifiers deftyp type_decl { 471 $$ = $3; 472 } 473 ; 474 475 arg_declaration_list_opt: /* C99 6.9.1p13 example 1 */ 476 /* empty */ 477 | arg_declaration_list 478 ; 479 480 arg_declaration_list: /* C99 6.9.1p13 example 1 */ 481 arg_declaration 482 | arg_declaration_list arg_declaration 483 /* XXX or better "arg_declaration error" ? */ 484 | error 485 ; 486 487 /* 488 * "arg_declaration" is separated from "declaration" because it 489 * needs other error handling. 490 */ 491 arg_declaration: 492 declmods deftyp T_SEMI { 493 /* empty declaration */ 494 warning(2); 495 } 496 | declmods deftyp notype_init_decls T_SEMI 497 | declaration_specifiers deftyp T_SEMI { 498 if (!dcs->d_nonempty_decl) { 499 /* empty declaration */ 500 warning(2); 501 } else { 502 /* '%s' declared in argument declaration list */ 503 warning(3, type_name(dcs->d_type)); 504 } 505 } 506 | declaration_specifiers deftyp type_init_decls T_SEMI { 507 if (dcs->d_nonempty_decl) { 508 /* '%s' declared in argument declaration list */ 509 warning(3, type_name(dcs->d_type)); 510 } 511 } 512 | declmods error 513 | declaration_specifiers error 514 ; 515 516 declaration: /* C99 6.7 */ 517 declmods deftyp T_SEMI { 518 if (dcs->d_scl == TYPEDEF) { 519 /* typedef declares no type name */ 520 warning(72); 521 } else { 522 /* empty declaration */ 523 warning(2); 524 } 525 } 526 | declmods deftyp notype_init_decls T_SEMI 527 | declaration_specifiers deftyp T_SEMI { 528 if (dcs->d_scl == TYPEDEF) { 529 /* typedef declares no type name */ 530 warning(72); 531 } else if (!dcs->d_nonempty_decl) { 532 /* empty declaration */ 533 warning(2); 534 } 535 } 536 | declaration_specifiers deftyp type_init_decls T_SEMI 537 | error T_SEMI 538 ; 539 540 type_attribute_format_type: 541 T_AT_FORMAT_GNU_PRINTF 542 | T_AT_FORMAT_PRINTF 543 | T_AT_FORMAT_SCANF 544 | T_AT_FORMAT_STRFMON 545 | T_AT_FORMAT_STRFTIME 546 | T_AT_FORMAT_SYSLOG 547 ; 548 549 type_attribute_bounded_type: 550 T_AT_MINBYTES 551 | T_AT_STRING 552 | T_AT_BUFFER 553 ; 554 555 556 type_attribute_spec: 557 /* empty */ 558 | T_AT_ALWAYS_INLINE 559 | T_AT_ALIAS T_LPAREN string T_RPAREN 560 | T_AT_ALIGNED T_LPAREN constant_expr T_RPAREN 561 | T_AT_ALIGNED 562 | T_AT_ALLOC_SIZE T_LPAREN constant_expr T_COMMA constant_expr T_RPAREN 563 | T_AT_ALLOC_SIZE T_LPAREN constant_expr T_RPAREN 564 | T_AT_BOUNDED T_LPAREN type_attribute_bounded_type 565 T_COMMA constant_expr T_COMMA constant_expr T_RPAREN 566 | T_AT_COLD 567 | T_AT_COMMON 568 | T_AT_CONSTRUCTOR T_LPAREN constant_expr T_RPAREN 569 | T_AT_CONSTRUCTOR 570 | T_AT_DEPRECATED T_LPAREN string T_RPAREN 571 | T_AT_DEPRECATED 572 | T_AT_DESTRUCTOR T_LPAREN constant_expr T_RPAREN 573 | T_AT_DESTRUCTOR 574 | T_AT_FALLTHROUGH { 575 fallthru(1); 576 } 577 | T_AT_FORMAT T_LPAREN type_attribute_format_type T_COMMA 578 constant_expr T_COMMA constant_expr T_RPAREN 579 | T_AT_FORMAT_ARG T_LPAREN constant_expr T_RPAREN 580 | T_AT_GNU_INLINE 581 | T_AT_MALLOC 582 | T_AT_MAY_ALIAS 583 | T_AT_MODE T_LPAREN T_NAME T_RPAREN 584 | T_AT_NOINLINE 585 | T_AT_NONNULL T_LPAREN constant_expr_list_opt T_RPAREN 586 | T_AT_NONNULL 587 | T_AT_NONSTRING 588 | T_AT_NORETURN 589 | T_AT_NOTHROW 590 | T_AT_NO_INSTRUMENT_FUNCTION 591 | T_AT_OPTIMIZE T_LPAREN string T_RPAREN 592 | T_AT_PACKED { 593 addpacked(); 594 } 595 | T_AT_PCS T_LPAREN string T_RPAREN 596 | T_AT_PURE 597 | T_AT_RETURNS_TWICE 598 | T_AT_SECTION T_LPAREN string T_RPAREN 599 | T_AT_SENTINEL T_LPAREN constant_expr T_RPAREN 600 | T_AT_SENTINEL 601 | T_AT_TLS_MODEL T_LPAREN string T_RPAREN 602 | T_AT_TUNION 603 | T_AT_UNUSED { 604 add_attr_used(); 605 } 606 | T_AT_USED { 607 add_attr_used(); 608 } 609 | T_AT_VISIBILITY T_LPAREN constant_expr T_RPAREN 610 | T_AT_WARN_UNUSED_RESULT 611 | T_AT_WEAK 612 | T_QUAL { 613 if ($1 != CONST) 614 yyerror("Bad attribute"); 615 } 616 ; 617 618 type_attribute_spec_list: 619 type_attribute_spec 620 | type_attribute_spec_list T_COMMA type_attribute_spec 621 ; 622 623 align_as: 624 typespec 625 | constant_expr 626 ; 627 628 type_attribute: 629 T_ATTRIBUTE T_LPAREN T_LPAREN { 630 attron = true; 631 } type_attribute_spec_list { 632 attron = false; 633 } T_RPAREN T_RPAREN 634 | T_ALIGNAS T_LPAREN align_as T_RPAREN { 635 } 636 | T_PACKED { 637 addpacked(); 638 } 639 | T_NORETURN { 640 } 641 ; 642 643 type_attribute_list: 644 type_attribute 645 | type_attribute_list type_attribute 646 ; 647 648 clrtyp: 649 /* empty */ { 650 clrtyp(); 651 } 652 ; 653 654 deftyp: 655 /* empty */ { 656 deftyp(); 657 } 658 ; 659 660 declaration_specifiers: /* C99 6.7 */ 661 clrtyp_typespec { 662 add_type($1); 663 } 664 | declmods typespec { 665 add_type($2); 666 } 667 | type_attribute declaration_specifiers 668 | declaration_specifiers declmod 669 | declaration_specifiers notype_typespec { 670 add_type($2); 671 } 672 ; 673 674 declmods: 675 clrtyp T_QUAL { 676 add_qualifier($2); 677 } 678 | clrtyp T_SCLASS { 679 add_storage_class($2); 680 } 681 | declmods declmod 682 ; 683 684 declmod: 685 T_QUAL { 686 add_qualifier($1); 687 } 688 | T_SCLASS { 689 add_storage_class($1); 690 } 691 | type_attribute_list 692 ; 693 694 clrtyp_typespec: 695 clrtyp notype_typespec { 696 $$ = $2; 697 } 698 | T_TYPENAME clrtyp { 699 $$ = getsym($1)->s_type; 700 } 701 ; 702 703 typespec: 704 notype_typespec { 705 $$ = $1; 706 } 707 | T_TYPENAME { 708 $$ = getsym($1)->s_type; 709 } 710 ; 711 712 notype_typespec: 713 T_TYPE { 714 $$ = gettyp($1); 715 } 716 | T_TYPEOF term { 717 $$ = $2->tn_type; 718 } 719 | struct_spec { 720 end_declaration_level(); 721 $$ = $1; 722 } 723 | enum_spec { 724 end_declaration_level(); 725 $$ = $1; 726 } 727 ; 728 729 struct_spec: 730 struct struct_tag { 731 /* 732 * STDC requires that "struct a;" always introduces 733 * a new tag if "a" is not declared at current level 734 * 735 * yychar is valid because otherwise the parser would not 736 * have been able to decide if it must shift or reduce 737 */ 738 $$ = mktag($2, $1, false, yychar == T_SEMI); 739 } 740 | struct struct_tag { 741 dcs->d_tagtyp = mktag($2, $1, true, false); 742 } struct_declaration { 743 $$ = complete_tag_struct_or_union(dcs->d_tagtyp, $4); 744 } 745 | struct { 746 dcs->d_tagtyp = mktag(NULL, $1, true, false); 747 } struct_declaration { 748 $$ = complete_tag_struct_or_union(dcs->d_tagtyp, $3); 749 } 750 | struct error { 751 symtyp = FVFT; 752 $$ = gettyp(INT); 753 } 754 ; 755 756 struct: 757 struct type_attribute 758 | T_STRUCT_OR_UNION { 759 symtyp = FTAG; 760 begin_declaration_level($1 == STRUCT ? MOS : MOU); 761 dcs->d_offset = 0; 762 dcs->d_stralign = CHAR_SIZE; 763 $$ = $1; 764 } 765 ; 766 767 struct_tag: 768 identifier { 769 $$ = getsym($1); 770 } 771 ; 772 773 struct_declaration: 774 struct_decl_lbrace member_declaration_list_with_rbrace { 775 $$ = $2; 776 } 777 ; 778 779 struct_decl_lbrace: 780 T_LBRACE { 781 symtyp = FVFT; 782 } 783 ; 784 785 member_declaration_list_with_rbrace: 786 member_declaration_list T_SEMI T_RBRACE { 787 $$ = $1; 788 } 789 | member_declaration_list T_RBRACE { 790 if (sflag) { 791 /* syntax req. ';' after last struct/union member */ 792 error(66); 793 } else { 794 /* syntax req. ';' after last struct/union member */ 795 warning(66); 796 } 797 $$ = $1; 798 } 799 | T_RBRACE { 800 $$ = NULL; 801 } 802 ; 803 804 opt_type_attribute: 805 /* empty */ 806 | type_attribute 807 ; 808 809 member_declaration_list: 810 member_declaration { 811 $$ = $1; 812 } 813 | member_declaration_list T_SEMI member_declaration { 814 $$ = lnklst($1, $3); 815 } 816 ; 817 818 member_declaration: 819 noclass_declmods deftyp { 820 /* too late, i know, but getsym() compensates it */ 821 symtyp = FMEMBER; 822 } notype_member_decls opt_type_attribute { 823 symtyp = FVFT; 824 $$ = $4; 825 } 826 | noclass_declspecs deftyp { 827 symtyp = FMEMBER; 828 } type_member_decls opt_type_attribute { 829 symtyp = FVFT; 830 $$ = $4; 831 } 832 | noclass_declmods deftyp opt_type_attribute { 833 symtyp = FVFT; 834 /* struct or union member must be named */ 835 if (!Sflag) 836 /* anonymous struct/union members is a C9X feature */ 837 warning(49); 838 /* add all the members of the anonymous struct/union */ 839 $$ = dcs->d_type->t_str->sou_first_member; 840 anonymize($$); 841 } 842 | noclass_declspecs deftyp opt_type_attribute { 843 symtyp = FVFT; 844 /* struct or union member must be named */ 845 if (!Sflag) 846 /* anonymous struct/union members is a C9X feature */ 847 warning(49); 848 if (is_struct_or_union(dcs->d_type->t_tspec)) { 849 $$ = dcs->d_type->t_str->sou_first_member; 850 /* add all the members of the anonymous struct/union */ 851 anonymize($$); 852 } else { 853 /* syntax error '%s' */ 854 error(249, "unnamed member"); 855 $$ = NULL; 856 } 857 } 858 | error { 859 symtyp = FVFT; 860 $$ = NULL; 861 } 862 ; 863 864 noclass_declspecs: 865 clrtyp_typespec { 866 add_type($1); 867 } 868 | type_attribute noclass_declspecs 869 | noclass_declmods typespec { 870 add_type($2); 871 } 872 | noclass_declspecs T_QUAL { 873 add_qualifier($2); 874 } 875 | noclass_declspecs notype_typespec { 876 add_type($2); 877 } 878 | noclass_declspecs type_attribute 879 ; 880 881 noclass_declmods: 882 clrtyp T_QUAL { 883 add_qualifier($2); 884 } 885 | noclass_declmods T_QUAL { 886 add_qualifier($2); 887 } 888 ; 889 890 notype_member_decls: 891 notype_member_decl { 892 $$ = declarator_1_struct_union($1); 893 } 894 | notype_member_decls { 895 symtyp = FMEMBER; 896 } T_COMMA type_member_decl { 897 $$ = lnklst($1, declarator_1_struct_union($4)); 898 } 899 ; 900 901 type_member_decls: 902 type_member_decl { 903 $$ = declarator_1_struct_union($1); 904 } 905 | type_member_decls { 906 symtyp = FMEMBER; 907 } T_COMMA type_member_decl { 908 $$ = lnklst($1, declarator_1_struct_union($4)); 909 } 910 ; 911 912 notype_member_decl: 913 notype_decl { 914 $$ = $1; 915 } 916 | notype_decl T_COLON constant_expr { /* C99 6.7.2.1 */ 917 $$ = bitfield($1, to_int_constant($3, true)); 918 } 919 | { 920 symtyp = FVFT; 921 } T_COLON constant_expr { /* C99 6.7.2.1 */ 922 $$ = bitfield(NULL, to_int_constant($3, true)); 923 } 924 ; 925 926 type_member_decl: 927 type_decl { 928 $$ = $1; 929 } 930 | type_decl T_COLON constant_expr { 931 $$ = bitfield($1, to_int_constant($3, true)); 932 } 933 | { 934 symtyp = FVFT; 935 } T_COLON constant_expr { 936 $$ = bitfield(NULL, to_int_constant($3, true)); 937 } 938 ; 939 940 enum_spec: 941 enum enum_tag { 942 $$ = mktag($2, ENUM, false, false); 943 } 944 | enum enum_tag { 945 dcs->d_tagtyp = mktag($2, ENUM, true, false); 946 } enum_declaration { 947 $$ = complete_tag_enum(dcs->d_tagtyp, $4); 948 } 949 | enum { 950 dcs->d_tagtyp = mktag(NULL, ENUM, true, false); 951 } enum_declaration { 952 $$ = complete_tag_enum(dcs->d_tagtyp, $3); 953 } 954 | enum error { 955 symtyp = FVFT; 956 $$ = gettyp(INT); 957 } 958 ; 959 960 enum: 961 T_ENUM { 962 symtyp = FTAG; 963 begin_declaration_level(CTCONST); 964 } 965 ; 966 967 enum_tag: 968 identifier { 969 $$ = getsym($1); 970 } 971 ; 972 973 enum_declaration: 974 enum_decl_lbrace enums_with_opt_comma T_RBRACE { 975 $$ = $2; 976 } 977 ; 978 979 enum_decl_lbrace: 980 T_LBRACE { 981 symtyp = FVFT; 982 enumval = 0; 983 } 984 ; 985 986 enums_with_opt_comma: 987 enums { 988 $$ = $1; 989 } 990 | enums T_COMMA { 991 if (sflag) { 992 /* trailing ',' prohibited in enum declaration */ 993 error(54); 994 } else { 995 /* trailing ',' prohibited in enum declaration */ 996 c99ism(54); 997 } 998 $$ = $1; 999 } 1000 ; 1001 1002 enums: 1003 enumerator { 1004 $$ = $1; 1005 } 1006 | enums T_COMMA enumerator { 1007 $$ = lnklst($1, $3); 1008 } 1009 | error { 1010 $$ = NULL; 1011 } 1012 ; 1013 1014 enumerator: 1015 enumeration_constant { 1016 $$ = enumeration_constant($1, enumval, true); 1017 } 1018 | enumeration_constant T_ASSIGN constant_expr { 1019 $$ = enumeration_constant($1, to_int_constant($3, true), false); 1020 } 1021 ; 1022 1023 enumeration_constant: /* C99 6.4.4.3 */ 1024 identifier { 1025 $$ = getsym($1); 1026 } 1027 ; 1028 1029 1030 notype_init_decls: 1031 notype_init_decl 1032 | notype_init_decls T_COMMA type_init_decl 1033 ; 1034 1035 type_init_decls: 1036 type_init_decl 1037 | type_init_decls T_COMMA type_init_decl 1038 ; 1039 1040 notype_init_decl: 1041 notype_decl opt_asm_or_symbolrename { 1042 cgram_declare($1, false, $2); 1043 check_size($1); 1044 } 1045 | notype_decl opt_asm_or_symbolrename { 1046 begin_initialization($1); 1047 cgram_declare($1, true, $2); 1048 } T_ASSIGN initializer { 1049 check_size($1); 1050 end_initialization(); 1051 } 1052 ; 1053 1054 type_init_decl: 1055 type_decl opt_asm_or_symbolrename { 1056 cgram_declare($1, false, $2); 1057 check_size($1); 1058 } 1059 | type_decl opt_asm_or_symbolrename { 1060 begin_initialization($1); 1061 cgram_declare($1, true, $2); 1062 } T_ASSIGN initializer { 1063 check_size($1); 1064 end_initialization(); 1065 } 1066 ; 1067 1068 notype_decl: 1069 notype_direct_decl { 1070 $$ = $1; 1071 } 1072 | pointer notype_direct_decl { 1073 $$ = add_pointer($2, $1); 1074 } 1075 ; 1076 1077 /* TODO: move below type_decl */ 1078 notype_direct_decl: 1079 T_NAME { 1080 $$ = declarator_name(getsym($1)); 1081 } 1082 | T_LPAREN type_decl T_RPAREN { 1083 $$ = $2; 1084 } 1085 | type_attribute notype_direct_decl { 1086 $$ = $2; 1087 } 1088 | notype_direct_decl T_LBRACK T_RBRACK { 1089 $$ = add_array($1, false, 0); 1090 } 1091 | notype_direct_decl T_LBRACK array_size T_RBRACK { 1092 $$ = add_array($1, true, to_int_constant($3, false)); 1093 } 1094 | notype_direct_decl param_list opt_asm_or_symbolrename { 1095 $$ = add_function(symbolrename($1, $3), $2); 1096 end_declaration_level(); 1097 block_level--; 1098 } 1099 | notype_direct_decl type_attribute_list 1100 /* TODO: either add { $$ = $1 } everywhere or remove it everywhere. */ 1101 ; 1102 1103 type_decl: 1104 type_direct_decl { 1105 $$ = $1; 1106 } 1107 | pointer type_direct_decl { 1108 $$ = add_pointer($2, $1); 1109 } 1110 ; 1111 1112 /* 1113 * TODO: document whether T_NAME here vs. identifier in notype_direct_decl 1114 * is on purpose. 1115 */ 1116 type_direct_decl: 1117 identifier { 1118 $$ = declarator_name(getsym($1)); 1119 } 1120 | T_LPAREN type_decl T_RPAREN { 1121 $$ = $2; 1122 } 1123 | type_attribute type_direct_decl { 1124 $$ = $2; 1125 } 1126 | type_direct_decl T_LBRACK T_RBRACK { 1127 $$ = add_array($1, false, 0); 1128 } 1129 | type_direct_decl T_LBRACK array_size T_RBRACK { 1130 $$ = add_array($1, true, to_int_constant($3, false)); 1131 } 1132 | type_direct_decl param_list opt_asm_or_symbolrename { 1133 $$ = add_function(symbolrename($1, $3), $2); 1134 end_declaration_level(); 1135 block_level--; 1136 } 1137 | type_direct_decl type_attribute_list 1138 ; 1139 1140 /* 1141 * param_decl and notype_param_decl exist to avoid a conflict in 1142 * argument lists. A typename enclosed in parens should always be 1143 * treated as a typename, not an argument. 1144 * "typedef int a; f(int (a));" is "typedef int a; f(int foo(a));" 1145 * not "typedef int a; f(int a);" 1146 */ 1147 param_decl: 1148 direct_param_decl { 1149 $$ = $1; 1150 } 1151 | pointer direct_param_decl { 1152 $$ = add_pointer($2, $1); 1153 } 1154 ; 1155 1156 /* TODO: consistently use 'opt' either as prefix or as suffix */ 1157 opt_type_qualifier_list: 1158 /* empty */ 1159 | type_qualifier_list 1160 ; 1161 1162 array_size: 1163 opt_type_qualifier_list T_SCLASS constant_expr { 1164 /* C11 6.7.6.3p7 */ 1165 if ($2 != STATIC) 1166 yyerror("Bad attribute"); 1167 /* static array size is a C11 extension */ 1168 c11ism(343); 1169 $$ = $3; 1170 } 1171 | constant_expr { 1172 $$ = $1; 1173 } 1174 ; 1175 1176 direct_param_decl: 1177 identifier type_attribute_list { 1178 $$ = declarator_name(getsym($1)); 1179 } 1180 | identifier { 1181 $$ = declarator_name(getsym($1)); 1182 } 1183 | T_LPAREN notype_param_decl T_RPAREN { 1184 $$ = $2; 1185 } 1186 | direct_param_decl T_LBRACK T_RBRACK { 1187 $$ = add_array($1, false, 0); 1188 } 1189 | direct_param_decl T_LBRACK array_size T_RBRACK { 1190 $$ = add_array($1, true, to_int_constant($3, false)); 1191 } 1192 | direct_param_decl param_list opt_asm_or_symbolrename { 1193 $$ = add_function(symbolrename($1, $3), $2); 1194 end_declaration_level(); 1195 block_level--; 1196 } 1197 ; 1198 1199 notype_param_decl: 1200 direct_notype_param_decl { 1201 $$ = $1; 1202 } 1203 | pointer direct_notype_param_decl { 1204 $$ = add_pointer($2, $1); 1205 } 1206 ; 1207 1208 direct_notype_param_decl: 1209 identifier { 1210 $$ = declarator_name(getsym($1)); 1211 } 1212 | T_LPAREN notype_param_decl T_RPAREN { 1213 $$ = $2; 1214 } 1215 | direct_notype_param_decl T_LBRACK T_RBRACK { 1216 $$ = add_array($1, false, 0); 1217 } 1218 | direct_notype_param_decl T_LBRACK array_size T_RBRACK { 1219 $$ = add_array($1, true, to_int_constant($3, false)); 1220 } 1221 | direct_notype_param_decl param_list opt_asm_or_symbolrename { 1222 $$ = add_function(symbolrename($1, $3), $2); 1223 end_declaration_level(); 1224 block_level--; 1225 } 1226 ; 1227 1228 /* TODO: rename 'pointer' to something less ambiguous, maybe 'pointer_level' */ 1229 pointer: 1230 asterisk { 1231 $$ = $1; 1232 } 1233 | asterisk type_qualifier_list { 1234 /* TODO: rename pqinf_t to be more expressive */ 1235 /* TODO: then rename the merge function */ 1236 $$ = merge_pointers_and_qualifiers($1, $2); 1237 } 1238 | asterisk pointer { 1239 $$ = merge_pointers_and_qualifiers($1, $2); 1240 } 1241 | asterisk type_qualifier_list pointer { 1242 $$ = merge_pointers_and_qualifiers($1, $2); 1243 $$ = merge_pointers_and_qualifiers($$, $3); 1244 } 1245 ; 1246 1247 asterisk: 1248 T_ASTERISK { 1249 $$ = xcalloc(1, sizeof(*$$)); 1250 $$->p_pointer = true; 1251 } 1252 ; 1253 1254 /* TODO: try whether type_qualifier_list_opt makes the code simpler */ 1255 type_qualifier_list: 1256 type_qualifier { 1257 $$ = $1; 1258 } 1259 | type_qualifier_list type_qualifier { 1260 $$ = merge_pointers_and_qualifiers($1, $2); 1261 } 1262 ; 1263 1264 type_qualifier: 1265 T_QUAL { 1266 $$ = xcalloc(1, sizeof(*$$)); 1267 if ($1 == CONST) { 1268 $$->p_const = true; 1269 } else if ($1 == VOLATILE) { 1270 $$->p_volatile = true; 1271 } else { 1272 lint_assert($1 == RESTRICT || $1 == THREAD); 1273 } 1274 } 1275 ; 1276 1277 param_list: 1278 id_list_lparen identifier_list T_RPAREN { 1279 $$ = $2; 1280 } 1281 | abstract_decl_param_list { 1282 $$ = $1; 1283 } 1284 ; 1285 1286 id_list_lparen: 1287 T_LPAREN { 1288 block_level++; 1289 begin_declaration_level(PROTO_ARG); 1290 } 1291 ; 1292 1293 identifier_list: 1294 T_NAME { 1295 $$ = old_style_function_name(getsym($1)); 1296 } 1297 | identifier_list T_COMMA T_NAME { 1298 $$ = lnklst($1, old_style_function_name(getsym($3))); 1299 } 1300 | identifier_list error { 1301 $$ = $1; 1302 } 1303 ; 1304 1305 abstract_decl_param_list: 1306 abstract_decl_lparen T_RPAREN opt_type_attribute { 1307 $$ = NULL; 1308 } 1309 | abstract_decl_lparen vararg_parameter_type_list T_RPAREN opt_type_attribute { 1310 dcs->d_proto = true; 1311 $$ = $2; 1312 } 1313 | abstract_decl_lparen error T_RPAREN opt_type_attribute { 1314 $$ = NULL; 1315 } 1316 ; 1317 1318 abstract_decl_lparen: 1319 T_LPAREN { 1320 block_level++; 1321 begin_declaration_level(PROTO_ARG); 1322 } 1323 ; 1324 1325 vararg_parameter_type_list: 1326 parameter_type_list { 1327 $$ = $1; 1328 } 1329 | parameter_type_list T_COMMA T_ELLIPSIS { 1330 dcs->d_vararg = true; 1331 $$ = $1; 1332 } 1333 | T_ELLIPSIS { 1334 if (sflag) { 1335 /* ANSI C requires formal parameter before '...' */ 1336 error(84); 1337 } else if (!tflag) { 1338 /* ANSI C requires formal parameter before '...' */ 1339 warning(84); 1340 } 1341 dcs->d_vararg = true; 1342 $$ = NULL; 1343 } 1344 ; 1345 1346 parameter_type_list: 1347 parameter_declaration { 1348 $$ = $1; 1349 } 1350 | parameter_type_list T_COMMA parameter_declaration { 1351 $$ = lnklst($1, $3); 1352 } 1353 ; 1354 1355 parameter_declaration: 1356 declmods deftyp { 1357 $$ = declare_argument(abstract_name(), false); 1358 } 1359 | declaration_specifiers deftyp { 1360 $$ = declare_argument(abstract_name(), false); 1361 } 1362 | declmods deftyp notype_param_decl { 1363 $$ = declare_argument($3, false); 1364 } 1365 /* 1366 * param_decl is needed because of following conflict: 1367 * "typedef int a; f(int (a));" could be parsed as 1368 * "function with argument a of type int", or 1369 * "function with an abstract argument of type function". 1370 * This grammar realizes the second case. 1371 */ 1372 | declaration_specifiers deftyp param_decl { 1373 $$ = declare_argument($3, false); 1374 } 1375 | declmods deftyp abstract_decl { 1376 $$ = declare_argument($3, false); 1377 } 1378 | declaration_specifiers deftyp abstract_decl { 1379 $$ = declare_argument($3, false); 1380 } 1381 ; 1382 1383 opt_asm_or_symbolrename: /* expect only one */ 1384 /* empty */ { 1385 $$ = NULL; 1386 } 1387 | T_ASM T_LPAREN T_STRING T_RPAREN { 1388 freeyyv(&$3, T_STRING); 1389 $$ = NULL; 1390 } 1391 | T_SYMBOLRENAME T_LPAREN T_NAME T_RPAREN { 1392 $$ = $3; 1393 } 1394 ; 1395 1396 initializer: /* C99 6.7.8 "Initialization" */ 1397 expr %prec T_COMMA { 1398 init_expr($1); 1399 } 1400 | init_lbrace init_rbrace { 1401 /* XXX: Empty braces are not covered by C99 6.7.8. */ 1402 } 1403 | init_lbrace initializer_list comma_opt init_rbrace 1404 | error 1405 ; 1406 1407 initializer_list: /* C99 6.7.8 "Initialization" */ 1408 initializer_list_item 1409 | initializer_list T_COMMA initializer_list_item 1410 ; 1411 1412 initializer_list_item: 1413 designation initializer 1414 | initializer 1415 ; 1416 1417 range: 1418 constant_expr { 1419 $$.lo = to_int_constant($1, true); 1420 $$.hi = $$.lo; 1421 } 1422 | constant_expr T_ELLIPSIS constant_expr { 1423 $$.lo = to_int_constant($1, true); 1424 $$.hi = to_int_constant($3, true); 1425 /* initialization with '[a...b]' is a GNU extension */ 1426 gnuism(340); 1427 } 1428 ; 1429 1430 designator: /* C99 6.7.8 "Initialization" */ 1431 T_LBRACK range T_RBRACK { 1432 add_designator_subscript($2); 1433 if (!Sflag) 1434 /* array initializer with des.s is a C9X feature */ 1435 warning(321); 1436 } 1437 | T_POINT identifier { 1438 if (!Sflag) 1439 /* struct or union member name in initializer is ... */ 1440 warning(313); 1441 add_designator_member($2); 1442 } 1443 ; 1444 1445 designator_list: /* C99 6.7.8 "Initialization" */ 1446 designator 1447 | designator_list designator 1448 ; 1449 1450 /* TODO: order from big to small */ 1451 designation: /* C99 6.7.8 "Initialization" */ 1452 designator_list T_ASSIGN 1453 | identifier T_COLON { 1454 /* GCC style struct or union member name in initializer */ 1455 gnuism(315); 1456 add_designator_member($1); 1457 } 1458 ; 1459 1460 init_lbrace: 1461 T_LBRACE { 1462 init_lbrace(); 1463 } 1464 ; 1465 1466 init_rbrace: 1467 T_RBRACE { 1468 init_rbrace(); 1469 } 1470 ; 1471 1472 type_name: 1473 { 1474 begin_declaration_level(ABSTRACT); 1475 } abstract_declaration { 1476 end_declaration_level(); 1477 $$ = $2->s_type; 1478 } 1479 ; 1480 1481 abstract_declaration: 1482 noclass_declmods deftyp { 1483 $$ = declare_1_abstract(abstract_name()); 1484 } 1485 | noclass_declspecs deftyp { 1486 $$ = declare_1_abstract(abstract_name()); 1487 } 1488 | noclass_declmods deftyp abstract_decl { 1489 $$ = declare_1_abstract($3); 1490 } 1491 | noclass_declspecs deftyp abstract_decl { 1492 $$ = declare_1_abstract($3); 1493 } 1494 ; 1495 1496 /* TODO: abstract_declaration and abstract_decl sound too similar */ 1497 abstract_decl: 1498 pointer { 1499 $$ = add_pointer(abstract_name(), $1); 1500 } 1501 | direct_abstract_decl { 1502 $$ = $1; 1503 } 1504 | pointer direct_abstract_decl { 1505 $$ = add_pointer($2, $1); 1506 } 1507 | T_TYPEOF term { 1508 $$ = mktempsym($2->tn_type); 1509 } 1510 ; 1511 1512 direct_abstract_decl: 1513 T_LPAREN abstract_decl T_RPAREN { 1514 $$ = $2; 1515 } 1516 | T_LBRACK T_RBRACK { 1517 $$ = add_array(abstract_name(), false, 0); 1518 } 1519 | T_LBRACK array_size T_RBRACK { 1520 $$ = add_array(abstract_name(), true, to_int_constant($2, false)); 1521 } 1522 | type_attribute direct_abstract_decl { 1523 $$ = $2; 1524 } 1525 | direct_abstract_decl T_LBRACK T_RBRACK { 1526 $$ = add_array($1, false, 0); 1527 } 1528 | direct_abstract_decl T_LBRACK array_size T_RBRACK { 1529 $$ = add_array($1, true, to_int_constant($3, false)); 1530 } 1531 | abstract_decl_param_list opt_asm_or_symbolrename { 1532 $$ = add_function(symbolrename(abstract_name(), $2), $1); 1533 end_declaration_level(); 1534 block_level--; 1535 } 1536 | direct_abstract_decl abstract_decl_param_list opt_asm_or_symbolrename { 1537 $$ = add_function(symbolrename($1, $3), $2); 1538 end_declaration_level(); 1539 block_level--; 1540 } 1541 | direct_abstract_decl type_attribute_list 1542 ; 1543 1544 non_expr_statement: 1545 type_attribute T_SEMI 1546 | labeled_statement 1547 | compound_statement 1548 | selection_statement 1549 | iteration_statement 1550 | jump_statement { 1551 seen_fallthrough = false; 1552 } 1553 | asm_statement 1554 ; 1555 1556 statement: /* C99 6.8 */ 1557 expr_statement 1558 | non_expr_statement 1559 ; 1560 1561 labeled_statement: /* C99 6.8.1 */ 1562 label opt_type_attribute statement 1563 ; 1564 1565 label: 1566 T_NAME T_COLON { 1567 symtyp = FLABEL; 1568 named_label(getsym($1)); 1569 } 1570 | T_CASE constant_expr T_COLON { 1571 case_label($2); 1572 seen_fallthrough = true; 1573 } 1574 | T_CASE constant_expr T_ELLIPSIS constant_expr T_COLON { 1575 /* XXX: We don't fill all cases */ 1576 case_label($2); 1577 seen_fallthrough = true; 1578 } 1579 | T_DEFAULT T_COLON { 1580 default_label(); 1581 seen_fallthrough = true; 1582 } 1583 ; 1584 1585 compound_statement: /* C99 6.8.2 */ 1586 compound_statement_lbrace compound_statement_rbrace 1587 | compound_statement_lbrace block_item_list compound_statement_rbrace 1588 ; 1589 1590 compound_statement_lbrace: 1591 T_LBRACE { 1592 block_level++; 1593 mem_block_level++; 1594 begin_declaration_level(AUTO); 1595 } 1596 ; 1597 1598 compound_statement_rbrace: 1599 T_RBRACE { 1600 end_declaration_level(); 1601 freeblk(); 1602 mem_block_level--; 1603 block_level--; 1604 seen_fallthrough = false; 1605 } 1606 ; 1607 1608 block_item_list: 1609 block_item 1610 | block_item_list block_item { 1611 if (!Sflag && $1 && !$2) 1612 /* declarations after statements is a C99 feature */ 1613 c99ism(327); 1614 $$ = $1 || $2; 1615 } 1616 ; 1617 1618 block_item: 1619 statement { 1620 $$ = true; 1621 restore_warning_flags(); 1622 } 1623 | declaration { 1624 $$ = false; 1625 restore_warning_flags(); 1626 } 1627 ; 1628 1629 expr_statement: 1630 expr T_SEMI { 1631 expr($1, false, false, false, false); 1632 seen_fallthrough = false; 1633 } 1634 | T_SEMI { 1635 seen_fallthrough = false; 1636 } 1637 ; 1638 1639 selection_statement: /* C99 6.8.4 */ 1640 if_without_else { 1641 save_warning_flags(); 1642 if2(); 1643 if3(false); 1644 } 1645 | if_without_else T_ELSE { 1646 save_warning_flags(); 1647 if2(); 1648 } statement { 1649 clear_warning_flags(); 1650 if3(true); 1651 } 1652 | if_without_else T_ELSE error { 1653 clear_warning_flags(); 1654 if3(false); 1655 } 1656 | switch_expr statement { 1657 clear_warning_flags(); 1658 switch2(); 1659 } 1660 | switch_expr error { 1661 clear_warning_flags(); 1662 switch2(); 1663 } 1664 ; 1665 1666 if_without_else: 1667 if_expr statement 1668 | if_expr error 1669 ; 1670 1671 if_expr: 1672 T_IF T_LPAREN expr T_RPAREN { 1673 if1($3); 1674 clear_warning_flags(); 1675 } 1676 ; 1677 1678 switch_expr: 1679 T_SWITCH T_LPAREN expr T_RPAREN { 1680 switch1($3); 1681 clear_warning_flags(); 1682 } 1683 ; 1684 1685 /* TODO: C11 6.5.1.1 says "assignment-expression", not plain "expr". */ 1686 /* TODO: c11ism */ 1687 generic_selection: /* C11 6.5.1.1 */ 1688 T_GENERIC T_LPAREN expr T_COMMA generic_assoc_list T_RPAREN { 1689 /* generic selection requires C11 or later */ 1690 c11ism(345); 1691 $$ = 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 term: 1915 T_NAME { 1916 /* XXX really necessary? */ 1917 if (yychar < 0) 1918 yychar = yylex(); 1919 $$ = new_name_node(getsym($1), yychar); 1920 } 1921 | string { 1922 $$ = new_string_node($1); 1923 } 1924 | T_CON { 1925 $$ = expr_new_constant(gettyp($1->v_tspec), $1); 1926 } 1927 | T_LPAREN expr T_RPAREN { 1928 if ($2 != NULL) 1929 $2->tn_parenthesized = true; 1930 $$ = $2; 1931 } 1932 | T_LPAREN compound_statement_lbrace gcc_statement_expr_list { 1933 block_level--; 1934 mem_block_level--; 1935 begin_initialization(mktempsym(dup_type($3->tn_type))); 1936 mem_block_level++; 1937 block_level++; 1938 /* ({ }) is a GCC extension */ 1939 gnuism(320); 1940 } compound_statement_rbrace T_RPAREN { 1941 $$ = new_name_node(*current_initsym(), 0); 1942 end_initialization(); 1943 } 1944 | term T_INCDEC { 1945 $$ = build($2 == INC ? INCAFT : DECAFT, $1, NULL); 1946 } 1947 | T_INCDEC term { 1948 $$ = build($1 == INC ? INCBEF : DECBEF, $2, NULL); 1949 } 1950 | T_ASTERISK term { 1951 $$ = build(INDIR, $2, NULL); 1952 } 1953 | T_AMPER term { 1954 $$ = build(ADDR, $2, NULL); 1955 } 1956 | T_UNARY term { 1957 $$ = build($1, $2, NULL); 1958 } 1959 | T_ADDITIVE term { 1960 if (tflag && $1 == PLUS) { 1961 /* unary + is illegal in traditional C */ 1962 warning(100); 1963 } 1964 $$ = build($1 == PLUS ? UPLUS : UMINUS, $2, NULL); 1965 } 1966 | term T_LBRACK expr T_RBRACK { 1967 $$ = build(INDIR, build(PLUS, $1, $3), NULL); 1968 } 1969 | term T_LPAREN T_RPAREN { 1970 $$ = new_function_call_node($1, NULL); 1971 } 1972 | term T_LPAREN func_arg_list T_RPAREN { 1973 $$ = new_function_call_node($1, $3); 1974 } 1975 | term point_or_arrow T_NAME { 1976 if ($1 != NULL) { 1977 sym_t *msym; 1978 /* 1979 * XXX struct_or_union_member should be integrated 1980 * in build() 1981 */ 1982 if ($2 == ARROW) { 1983 /* 1984 * must do this before struct_or_union_member 1985 * is called 1986 */ 1987 $1 = cconv($1); 1988 } 1989 msym = struct_or_union_member($1, $2, getsym($3)); 1990 $$ = build($2, $1, new_name_node(msym, 0)); 1991 } else { 1992 $$ = NULL; 1993 } 1994 } 1995 | T_REAL term { 1996 $$ = build(REAL, $2, NULL); 1997 } 1998 | T_IMAG term { 1999 $$ = build(IMAG, $2, NULL); 2000 } 2001 | T_EXTENSION term { 2002 $$ = $2; 2003 } 2004 | T_REAL T_LPAREN term T_RPAREN { 2005 $$ = build(REAL, $3, NULL); 2006 } 2007 | T_IMAG T_LPAREN term T_RPAREN { 2008 $$ = build(IMAG, $3, NULL); 2009 } 2010 | T_BUILTIN_OFFSETOF T_LPAREN type_name T_COMMA identifier T_RPAREN { 2011 symtyp = FMEMBER; 2012 $$ = build_offsetof($3, getsym($5)); 2013 } 2014 | T_SIZEOF term { 2015 $$ = $2 == NULL ? NULL : build_sizeof($2->tn_type); 2016 if ($$ != NULL) 2017 check_expr_misc($2, false, false, false, false, false, true); 2018 } 2019 | T_SIZEOF T_LPAREN type_name T_RPAREN %prec T_SIZEOF { 2020 $$ = build_sizeof($3); 2021 } 2022 | T_ALIGNOF T_LPAREN type_name T_RPAREN { 2023 $$ = build_alignof($3); 2024 } 2025 | T_LPAREN type_name T_RPAREN term %prec T_UNARY { 2026 $$ = cast($4, $2); 2027 } 2028 | T_LPAREN type_name T_RPAREN { /* C99 6.5.2.5 "Compound literals" */ 2029 sym_t *tmp = mktempsym($2); 2030 begin_initialization(tmp); 2031 cgram_declare(tmp, true, NULL); 2032 } init_lbrace initializer_list comma_opt init_rbrace { 2033 if (!Sflag) 2034 /* compound literals are a C9X/GCC extension */ 2035 gnuism(319); 2036 $$ = new_name_node(*current_initsym(), 0); 2037 end_initialization(); 2038 } 2039 ; 2040 2041 /* 2042 * The inner part of a GCC statement-expression of the form ({ ... }). 2043 * 2044 * https://gcc.gnu.org/onlinedocs/gcc/Statement-Exprs.html 2045 */ 2046 gcc_statement_expr_list: 2047 gcc_statement_expr_item 2048 | gcc_statement_expr_list gcc_statement_expr_item { 2049 $$ = $2; 2050 } 2051 ; 2052 2053 gcc_statement_expr_item: 2054 declaration { 2055 clear_warning_flags(); 2056 $$ = NULL; 2057 } 2058 | non_expr_statement { 2059 $$ = expr_zalloc_tnode(); 2060 $$->tn_type = gettyp(VOID); 2061 } 2062 | expr T_SEMI { 2063 if ($1 == NULL) { /* in case of syntax errors */ 2064 $$ = expr_zalloc_tnode(); 2065 $$->tn_type = gettyp(VOID); 2066 } else { 2067 /* XXX: do that only on the last name */ 2068 if ($1->tn_op == NAME) 2069 $1->tn_sym->s_used = true; 2070 $$ = $1; 2071 expr($1, false, false, false, false); 2072 seen_fallthrough = false; 2073 } 2074 } 2075 ; 2076 2077 string: 2078 T_STRING { 2079 $$ = $1; 2080 } 2081 | T_STRING string2 { 2082 $$ = cat_strings($1, $2); 2083 } 2084 ; 2085 2086 string2: 2087 T_STRING { 2088 if (tflag) { 2089 /* concatenated strings are illegal in traditional C */ 2090 warning(219); 2091 } 2092 $$ = $1; 2093 } 2094 | string2 T_STRING { 2095 $$ = cat_strings($1, $2); 2096 } 2097 ; 2098 2099 func_arg_list: 2100 expr %prec T_COMMA { 2101 $$ = new_function_argument_node(NULL, $1); 2102 } 2103 | func_arg_list T_COMMA expr { 2104 $$ = new_function_argument_node($1, $3); 2105 } 2106 ; 2107 2108 point_or_arrow: 2109 T_POINT { 2110 symtyp = FMEMBER; 2111 $$ = POINT; 2112 } 2113 | T_ARROW { 2114 symtyp = FMEMBER; 2115 $$ = ARROW; 2116 } 2117 ; 2118 2119 identifier: /* C99 6.4.2.1 */ 2120 T_NAME { 2121 $$ = $1; 2122 cgram_debug("name '%s'", $$->sb_name); 2123 } 2124 | T_TYPENAME { 2125 $$ = $1; 2126 cgram_debug("typename '%s'", $$->sb_name); 2127 } 2128 ; 2129 2130 comma_opt: 2131 T_COMMA 2132 | /* empty */ 2133 ; 2134 %% 2135 2136 /* ARGSUSED */ 2137 int 2138 yyerror(const char *msg) 2139 { 2140 /* syntax error '%s' */ 2141 error(249, yytext); 2142 if (++sytxerr >= 5) 2143 norecover(); 2144 return 0; 2145 } 2146 2147 static void 2148 cgram_declare(sym_t *decl, bool initflg, sbuf_t *renaming) 2149 { 2150 declare(decl, initflg, renaming); 2151 if (renaming != NULL) 2152 freeyyv(&renaming, T_NAME); 2153 } 2154 2155 /* 2156 * Discard all input tokens up to and including the next 2157 * unmatched right paren 2158 */ 2159 static void 2160 ignore_up_to_rparen(void) 2161 { 2162 int level; 2163 2164 if (yychar < 0) 2165 yychar = yylex(); 2166 freeyyv(&yylval, yychar); 2167 2168 level = 1; 2169 while (yychar != T_RPAREN || --level > 0) { 2170 if (yychar == T_LPAREN) { 2171 level++; 2172 } else if (yychar <= 0) { 2173 break; 2174 } 2175 freeyyv(&yylval, yychar = yylex()); 2176 } 2177 2178 yyclearin; 2179 } 2180 2181 static sym_t * 2182 symbolrename(sym_t *s, sbuf_t *sb) 2183 { 2184 if (sb != NULL) 2185 s->s_rename = sb->sb_name; 2186 return s; 2187 } 2188
Indexes created Fri Oct 03 02:09:57 GMT 2025