cgram.y revision 1.201
1 %{ 2 /* $NetBSD: cgram.y,v 1.201 2021/03/26 16:05:19 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 1.201 2021/03/26 16:05:19 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; s = s->s_next) 122 s->s_styp = NULL; 123 } 124 %} 125 126 %expect 165 127 128 %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 int y_seen_statement; 142 }; 143 144 %token T_LBRACE T_RBRACE T_LBRACK T_RBRACK T_LPAREN T_RPAREN 145 %token <y_op> T_MEMBACC 146 %token <y_op> T_UNARY 147 %token <y_op> T_INCDEC 148 %token T_SIZEOF 149 %token T_BUILTIN_OFFSETOF 150 %token T_TYPEOF 151 %token T_EXTENSION 152 %token T_ALIGNAS 153 %token T_ALIGNOF 154 %token T_ASTERISK 155 %token <y_op> T_MULTIPLICATIVE 156 %token <y_op> T_ADDITIVE 157 %token <y_op> T_SHIFT 158 %token <y_op> T_RELATIONAL 159 %token <y_op> T_EQUALITY 160 %token T_AMPER 161 %token T_BITXOR 162 %token T_BITOR 163 %token T_LOGAND 164 %token T_LOGOR 165 %token T_QUEST 166 %token T_COLON 167 %token T_ASSIGN 168 %token <y_op> T_OPASSIGN 169 %token T_COMMA 170 %token T_SEMI 171 %token T_ELLIPSIS 172 %token T_REAL 173 %token T_IMAG 174 %token T_GENERIC 175 %token T_NORETURN 176 177 /* storage classes (extern, static, auto, register and typedef) */ 178 %token <y_scl> T_SCLASS 179 180 /* 181 * predefined type keywords (char, int, short, long, unsigned, signed, 182 * float, double, void); see T_TYPENAME 183 */ 184 %token <y_tspec> T_TYPE 185 186 /* qualifiers (const, volatile, restrict, _Thread_local) */ 187 %token <y_tqual> T_QUAL 188 189 /* struct or union */ 190 %token <y_tspec> T_STRUCT_OR_UNION 191 192 /* remaining keywords */ 193 %token T_ASM 194 %token T_BREAK 195 %token T_CASE 196 %token T_CONTINUE 197 %token T_DEFAULT 198 %token T_DO 199 %token T_ELSE 200 %token T_ENUM 201 %token T_FOR 202 %token T_GOTO 203 %token T_IF 204 %token T_PACKED 205 %token T_RETURN 206 %token T_SWITCH 207 %token T_SYMBOLRENAME 208 %token T_WHILE 209 /* Type Attributes */ 210 %token <y_type> T_ATTRIBUTE 211 %token <y_type> T_AT_ALIAS 212 %token <y_type> T_AT_ALIGNED 213 %token <y_type> T_AT_ALLOC_SIZE 214 %token <y_type> T_AT_ALWAYS_INLINE 215 %token <y_type> T_AT_BOUNDED 216 %token <y_type> T_AT_BUFFER 217 %token <y_type> T_AT_COLD 218 %token <y_type> T_AT_CONSTRUCTOR 219 %token <y_type> T_AT_DEPRECATED 220 %token <y_type> T_AT_DESTRUCTOR 221 %token <y_type> T_AT_FORMAT 222 %token <y_type> T_AT_FORMAT_ARG 223 %token <y_type> T_AT_FORMAT_GNU_PRINTF 224 %token <y_type> T_AT_FORMAT_PRINTF 225 %token <y_type> T_AT_FORMAT_SCANF 226 %token <y_type> T_AT_FORMAT_STRFMON 227 %token <y_type> T_AT_FORMAT_STRFTIME 228 %token <y_type> T_AT_FORMAT_SYSLOG 229 %token <y_type> T_AT_GNU_INLINE 230 %token <y_type> T_AT_MALLOC 231 %token <y_type> T_AT_MAY_ALIAS 232 %token <y_type> T_AT_MINBYTES 233 %token <y_type> T_AT_MODE 234 %token <y_type> T_AT_NOINLINE 235 %token <y_type> T_AT_NONNULL 236 %token <y_type> T_AT_NORETURN 237 %token <y_type> T_AT_NOTHROW 238 %token <y_type> T_AT_NO_INSTRUMENT_FUNCTION 239 %token <y_type> T_AT_OPTIMIZE 240 %token <y_type> T_AT_PACKED 241 %token <y_type> T_AT_PCS 242 %token <y_type> T_AT_PURE 243 %token <y_type> T_AT_RETURNS_TWICE 244 %token <y_type> T_AT_SECTION 245 %token <y_type> T_AT_SENTINEL 246 %token <y_type> T_AT_STRING 247 %token <y_type> T_AT_TLS_MODEL 248 %token <y_type> T_AT_TUNION 249 %token <y_type> T_AT_UNUSED 250 %token <y_type> T_AT_USED 251 %token <y_type> T_AT_VISIBILITY 252 %token <y_type> T_AT_WARN_UNUSED_RESULT 253 %token <y_type> T_AT_WEAK 254 255 %left T_COMMA 256 %right T_ASSIGN T_OPASSIGN 257 %right T_QUEST T_COLON 258 %left T_LOGOR 259 %left T_LOGAND 260 %left T_BITOR 261 %left T_BITXOR 262 %left T_AMPER 263 %left T_EQUALITY 264 %left T_RELATIONAL 265 %left T_SHIFT 266 %left T_ADDITIVE 267 %left T_ASTERISK T_MULTIPLICATIVE 268 %right T_UNARY T_INCDEC T_SIZEOF T_REAL T_IMAG 269 %left T_LPAREN T_LBRACK T_MEMBACC 270 271 %token <y_sb> T_NAME 272 %token <y_sb> T_TYPENAME 273 %token <y_val> T_CON 274 %token <y_string> T_STRING 275 276 %type <y_sym> func_decl 277 %type <y_sym> notype_decl 278 %type <y_sym> type_decl 279 %type <y_type> typespec 280 %type <y_type> clrtyp_typespec 281 %type <y_type> notype_typespec 282 %type <y_type> struct_spec 283 %type <y_type> enum_spec 284 %type <y_type> type_attribute 285 %type <y_sym> struct_tag 286 %type <y_sym> enum_tag 287 %type <y_tspec> struct 288 %type <y_sym> struct_declaration 289 %type <y_sb> identifier 290 %type <y_sym> member_declaration_list_with_rbrace 291 %type <y_sym> member_declaration_list 292 %type <y_sym> member_declaration 293 %type <y_sym> notype_member_decls 294 %type <y_sym> type_member_decls 295 %type <y_sym> notype_member_decl 296 %type <y_sym> type_member_decl 297 %type <y_tnode> constant_expr 298 %type <y_sym> enum_declaration 299 %type <y_sym> enums_with_opt_comma 300 %type <y_sym> enums 301 %type <y_sym> enumerator 302 %type <y_sym> enumeration_constant 303 %type <y_sym> notype_direct_decl 304 %type <y_sym> type_direct_decl 305 %type <y_pqinf> pointer 306 %type <y_pqinf> asterisk 307 %type <y_sym> param_decl 308 %type <y_sym> param_list 309 %type <y_sym> abstract_decl_param_list 310 %type <y_sym> direct_param_decl 311 %type <y_sym> notype_param_decl 312 %type <y_sym> direct_notype_param_decl 313 %type <y_pqinf> type_qualifier_list 314 %type <y_pqinf> type_qualifier 315 %type <y_sym> identifier_list 316 %type <y_sym> abstract_decl 317 %type <y_sym> direct_abstract_decl 318 %type <y_sym> vararg_parameter_type_list 319 %type <y_sym> parameter_type_list 320 %type <y_sym> parameter_declaration 321 %type <y_tnode> expr 322 %type <y_tnode> expr_statement_val 323 %type <y_tnode> expr_statement_list 324 %type <y_tnode> term 325 %type <y_tnode> generic_expr 326 %type <y_tnode> func_arg_list 327 %type <y_op> point_or_arrow 328 %type <y_type> type_name 329 %type <y_sym> abstract_declaration 330 %type <y_tnode> do_while_expr 331 %type <y_tnode> opt_expr 332 %type <y_string> string 333 %type <y_string> string2 334 %type <y_sb> opt_asm_or_symbolrename 335 %type <y_range> range 336 %type <y_seen_statement> block_item_list 337 %type <y_seen_statement> block_item 338 339 340 %% 341 342 program: 343 /* empty */ { 344 if (sflag) { 345 /* empty translation unit */ 346 error(272); 347 } else if (!tflag) { 348 /* empty translation unit */ 349 warning(272); 350 } 351 } 352 | translation_unit 353 ; 354 355 translation_unit: /* C99 6.9 */ 356 external_declaration 357 | translation_unit external_declaration 358 ; 359 360 external_declaration: /* C99 6.9 */ 361 asm_statement 362 | function_definition { 363 global_clean_up_decl(false); 364 clear_warning_flags(); 365 } 366 | top_level_declaration { 367 global_clean_up_decl(false); 368 clear_warning_flags(); 369 } 370 ; 371 372 /* 373 * On the top level, lint allows several forms of declarations that it doesn't 374 * allow in functions. For example, a single ';' is an empty declaration and 375 * is supported by some compilers, but in a function it would be an empty 376 * statement, not a declaration. This makes a difference in C90 mode, where 377 * a statement must not be followed by a declaration. 378 * 379 * See 'declaration' for all other declarations. 380 */ 381 top_level_declaration: /* C99 6.9 calls this 'declaration' */ 382 T_SEMI { 383 if (sflag) { 384 /* empty declaration */ 385 error(0); 386 } else if (!tflag) { 387 /* empty declaration */ 388 warning(0); 389 } 390 } 391 | clrtyp deftyp notype_init_decls T_SEMI { 392 if (sflag) { 393 /* old style declaration; add 'int' */ 394 error(1); 395 } else if (!tflag) { 396 /* old style declaration; add 'int' */ 397 warning(1); 398 } 399 } 400 | declmods deftyp T_SEMI { 401 if (dcs->d_scl == TYPEDEF) { 402 /* typedef declares no type name */ 403 warning(72); 404 } else { 405 /* empty declaration */ 406 warning(2); 407 } 408 } 409 | declmods deftyp notype_init_decls T_SEMI 410 | declaration_specifiers deftyp T_SEMI { 411 if (dcs->d_scl == TYPEDEF) { 412 /* typedef declares no type name */ 413 warning(72); 414 } else if (!dcs->d_nonempty_decl) { 415 /* empty declaration */ 416 warning(2); 417 } 418 } 419 | declaration_specifiers deftyp type_init_decls T_SEMI 420 | error T_SEMI { 421 global_clean_up(); 422 } 423 | error T_RBRACE { 424 global_clean_up(); 425 } 426 ; 427 428 function_definition: /* C99 6.9.1 */ 429 func_decl { 430 if ($1->s_type->t_tspec != FUNC) { 431 /* syntax error '%s' */ 432 error(249, yytext); 433 YYERROR; 434 } 435 if ($1->s_type->t_typedef) { 436 /* ()-less function definition */ 437 error(64); 438 YYERROR; 439 } 440 funcdef($1); 441 block_level++; 442 pushdecl(ARG); 443 if (lwarn == LWARN_NONE) 444 $1->s_used = true; 445 } arg_declaration_list_opt { 446 popdecl(); 447 block_level--; 448 check_func_lint_directives(); 449 check_func_old_style_arguments(); 450 pushctrl(0); 451 } compound_statement { 452 funcend(); 453 popctrl(0); 454 } 455 ; 456 457 func_decl: 458 clrtyp deftyp notype_decl { 459 $$ = $3; 460 } 461 | declmods deftyp notype_decl { 462 $$ = $3; 463 } 464 | declaration_specifiers deftyp type_decl { 465 $$ = $3; 466 } 467 ; 468 469 arg_declaration_list_opt: /* C99 6.9.1p13 example 1 */ 470 /* empty */ 471 | arg_declaration_list 472 ; 473 474 arg_declaration_list: /* C99 6.9.1p13 example 1 */ 475 arg_declaration 476 | arg_declaration_list arg_declaration 477 /* XXX or better "arg_declaration error" ? */ 478 | error 479 ; 480 481 /* 482 * "arg_declaration" is separated from "declaration" because it 483 * needs other error handling. 484 */ 485 arg_declaration: 486 declmods deftyp T_SEMI { 487 /* empty declaration */ 488 warning(2); 489 } 490 | declmods deftyp notype_init_decls T_SEMI 491 | declaration_specifiers deftyp T_SEMI { 492 if (!dcs->d_nonempty_decl) { 493 /* empty declaration */ 494 warning(2); 495 } else { 496 /* '%s' declared in argument declaration list */ 497 warning(3, type_name(dcs->d_type)); 498 } 499 } 500 | declaration_specifiers deftyp type_init_decls T_SEMI { 501 if (dcs->d_nonempty_decl) { 502 /* '%s' declared in argument declaration list */ 503 warning(3, type_name(dcs->d_type)); 504 } 505 } 506 | declmods error 507 | declaration_specifiers error 508 ; 509 510 declaration: /* C99 6.7 */ 511 declmods deftyp T_SEMI { 512 if (dcs->d_scl == TYPEDEF) { 513 /* typedef declares no type name */ 514 warning(72); 515 } else { 516 /* empty declaration */ 517 warning(2); 518 } 519 } 520 | declmods deftyp notype_init_decls T_SEMI 521 | declaration_specifiers deftyp T_SEMI { 522 if (dcs->d_scl == TYPEDEF) { 523 /* typedef declares no type name */ 524 warning(72); 525 } else if (!dcs->d_nonempty_decl) { 526 /* empty declaration */ 527 warning(2); 528 } 529 } 530 | declaration_specifiers deftyp type_init_decls T_SEMI 531 | error T_SEMI 532 ; 533 534 type_attribute_format_type: 535 T_AT_FORMAT_GNU_PRINTF 536 | T_AT_FORMAT_PRINTF 537 | T_AT_FORMAT_SCANF 538 | T_AT_FORMAT_STRFMON 539 | T_AT_FORMAT_STRFTIME 540 | T_AT_FORMAT_SYSLOG 541 ; 542 543 type_attribute_bounded_type: 544 T_AT_MINBYTES 545 | T_AT_STRING 546 | T_AT_BUFFER 547 ; 548 549 550 type_attribute_spec: 551 /* empty */ 552 | T_AT_DEPRECATED T_LPAREN string T_RPAREN 553 | T_AT_DEPRECATED 554 | T_AT_ALIGNED T_LPAREN constant_expr T_RPAREN 555 | T_AT_ALLOC_SIZE T_LPAREN constant_expr T_COMMA constant_expr T_RPAREN 556 | T_AT_ALLOC_SIZE T_LPAREN constant_expr T_RPAREN 557 | T_AT_BOUNDED T_LPAREN type_attribute_bounded_type 558 T_COMMA constant_expr T_COMMA constant_expr T_RPAREN 559 | T_AT_SENTINEL T_LPAREN constant_expr T_RPAREN 560 | T_AT_SENTINEL 561 | T_AT_FORMAT_ARG T_LPAREN constant_expr T_RPAREN 562 | T_AT_NONNULL T_LPAREN constant_expr T_RPAREN 563 | T_AT_MODE T_LPAREN T_NAME T_RPAREN 564 | T_AT_ALIAS T_LPAREN string T_RPAREN 565 | T_AT_OPTIMIZE T_LPAREN string T_RPAREN 566 | T_AT_PCS T_LPAREN string T_RPAREN 567 | T_AT_SECTION T_LPAREN string T_RPAREN 568 | T_AT_TLS_MODEL T_LPAREN string T_RPAREN 569 | T_AT_ALIGNED 570 | T_AT_CONSTRUCTOR 571 | T_AT_DESTRUCTOR 572 | T_AT_MALLOC 573 | T_AT_MAY_ALIAS 574 | T_AT_NO_INSTRUMENT_FUNCTION 575 | T_AT_NOINLINE 576 | T_AT_NORETURN 577 | T_AT_NOTHROW 578 | T_AT_COLD 579 | T_AT_RETURNS_TWICE 580 | T_AT_PACKED { 581 addpacked(); 582 } 583 | T_AT_PURE 584 | T_AT_TUNION 585 | T_AT_GNU_INLINE 586 | T_AT_ALWAYS_INLINE 587 | T_AT_FORMAT T_LPAREN type_attribute_format_type T_COMMA 588 constant_expr T_COMMA constant_expr T_RPAREN 589 | T_AT_USED { 590 add_attr_used(); 591 } 592 | T_AT_UNUSED { 593 add_attr_used(); 594 } 595 | T_AT_WARN_UNUSED_RESULT 596 | T_AT_WEAK 597 | T_AT_VISIBILITY T_LPAREN constant_expr T_RPAREN 598 | T_QUAL { 599 if ($1 != CONST) 600 yyerror("Bad attribute"); 601 } 602 ; 603 604 type_attribute_spec_list: 605 type_attribute_spec 606 | type_attribute_spec_list T_COMMA type_attribute_spec 607 ; 608 609 align_as: 610 typespec 611 | constant_expr 612 ; 613 614 type_attribute: 615 T_ATTRIBUTE T_LPAREN T_LPAREN { 616 attron = true; 617 } type_attribute_spec_list { 618 attron = false; 619 } T_RPAREN T_RPAREN 620 | T_ALIGNAS T_LPAREN align_as T_RPAREN { 621 } 622 | T_PACKED { 623 addpacked(); 624 } 625 | T_NORETURN { 626 } 627 ; 628 629 type_attribute_list: 630 type_attribute 631 | type_attribute_list type_attribute 632 ; 633 634 clrtyp: 635 /* empty */ { 636 clrtyp(); 637 } 638 ; 639 640 deftyp: 641 /* empty */ { 642 deftyp(); 643 } 644 ; 645 646 declaration_specifiers: /* C99 6.7 */ 647 clrtyp_typespec { 648 add_type($1); 649 } 650 | declmods typespec { 651 add_type($2); 652 } 653 | type_attribute declaration_specifiers 654 | declaration_specifiers declmod 655 | declaration_specifiers notype_typespec { 656 add_type($2); 657 } 658 ; 659 660 declmods: 661 clrtyp T_QUAL { 662 add_qualifier($2); 663 } 664 | clrtyp T_SCLASS { 665 add_storage_class($2); 666 } 667 | declmods declmod 668 ; 669 670 declmod: 671 T_QUAL { 672 add_qualifier($1); 673 } 674 | T_SCLASS { 675 add_storage_class($1); 676 } 677 | type_attribute_list 678 ; 679 680 clrtyp_typespec: 681 clrtyp notype_typespec { 682 $$ = $2; 683 } 684 | T_TYPENAME clrtyp { 685 $$ = getsym($1)->s_type; 686 } 687 ; 688 689 typespec: 690 notype_typespec { 691 $$ = $1; 692 } 693 | T_TYPENAME { 694 $$ = getsym($1)->s_type; 695 } 696 ; 697 698 notype_typespec: 699 T_TYPE { 700 $$ = gettyp($1); 701 } 702 | T_TYPEOF term { 703 $$ = $2->tn_type; 704 } 705 | struct_spec { 706 popdecl(); 707 $$ = $1; 708 } 709 | enum_spec { 710 popdecl(); 711 $$ = $1; 712 } 713 ; 714 715 struct_spec: 716 struct struct_tag { 717 /* 718 * STDC requires that "struct a;" always introduces 719 * a new tag if "a" is not declared at current level 720 * 721 * yychar is valid because otherwise the parser would not 722 * have been able to decide if it must shift or reduce 723 */ 724 $$ = mktag($2, $1, false, yychar == T_SEMI); 725 } 726 | struct struct_tag { 727 dcs->d_tagtyp = mktag($2, $1, true, false); 728 } struct_declaration { 729 $$ = complete_tag_struct_or_union(dcs->d_tagtyp, $4); 730 } 731 | struct { 732 dcs->d_tagtyp = mktag(NULL, $1, true, false); 733 } struct_declaration { 734 $$ = complete_tag_struct_or_union(dcs->d_tagtyp, $3); 735 } 736 | struct error { 737 symtyp = FVFT; 738 $$ = gettyp(INT); 739 } 740 ; 741 742 struct: 743 struct type_attribute 744 | T_STRUCT_OR_UNION { 745 symtyp = FTAG; 746 pushdecl($1 == STRUCT ? MOS : MOU); 747 dcs->d_offset = 0; 748 dcs->d_stralign = CHAR_SIZE; 749 $$ = $1; 750 } 751 ; 752 753 struct_tag: 754 identifier { 755 $$ = getsym($1); 756 } 757 ; 758 759 struct_declaration: 760 struct_decl_lbrace member_declaration_list_with_rbrace { 761 $$ = $2; 762 } 763 ; 764 765 struct_decl_lbrace: 766 T_LBRACE { 767 symtyp = FVFT; 768 } 769 ; 770 771 member_declaration_list_with_rbrace: 772 member_declaration_list T_SEMI T_RBRACE { 773 $$ = $1; 774 } 775 | member_declaration_list T_RBRACE { 776 if (sflag) { 777 /* syntax req. ';' after last struct/union member */ 778 error(66); 779 } else { 780 /* syntax req. ';' after last struct/union member */ 781 warning(66); 782 } 783 $$ = $1; 784 } 785 | T_RBRACE { 786 $$ = NULL; 787 } 788 ; 789 790 opt_type_attribute: 791 /* empty */ 792 | type_attribute 793 ; 794 795 member_declaration_list: 796 member_declaration { 797 $$ = $1; 798 } 799 | member_declaration_list T_SEMI member_declaration { 800 $$ = lnklst($1, $3); 801 } 802 ; 803 804 member_declaration: 805 noclass_declmods deftyp { 806 /* too late, i know, but getsym() compensates it */ 807 symtyp = FMEMBER; 808 } notype_member_decls opt_type_attribute { 809 symtyp = FVFT; 810 $$ = $4; 811 } 812 | noclass_declspecs deftyp { 813 symtyp = FMEMBER; 814 } type_member_decls opt_type_attribute { 815 symtyp = FVFT; 816 $$ = $4; 817 } 818 | noclass_declmods deftyp opt_type_attribute { 819 symtyp = FVFT; 820 /* struct or union member must be named */ 821 if (!Sflag) 822 /* anonymous struct/union members is a C9X feature */ 823 warning(49); 824 /* add all the members of the anonymous struct/union */ 825 $$ = dcs->d_type->t_str->sou_first_member; 826 anonymize($$); 827 } 828 | noclass_declspecs deftyp opt_type_attribute { 829 symtyp = FVFT; 830 /* struct or union member must be named */ 831 if (!Sflag) 832 /* anonymous struct/union members is a C9X feature */ 833 warning(49); 834 $$ = dcs->d_type->t_str->sou_first_member; 835 /* add all the members of the anonymous struct/union */ 836 anonymize($$); 837 } 838 | error { 839 symtyp = FVFT; 840 $$ = NULL; 841 } 842 ; 843 844 noclass_declspecs: 845 clrtyp_typespec { 846 add_type($1); 847 } 848 | type_attribute noclass_declspecs 849 | noclass_declmods typespec { 850 add_type($2); 851 } 852 | noclass_declspecs T_QUAL { 853 add_qualifier($2); 854 } 855 | noclass_declspecs notype_typespec { 856 add_type($2); 857 } 858 | noclass_declspecs type_attribute 859 ; 860 861 noclass_declmods: 862 clrtyp T_QUAL { 863 add_qualifier($2); 864 } 865 | noclass_declmods T_QUAL { 866 add_qualifier($2); 867 } 868 ; 869 870 notype_member_decls: 871 notype_member_decl { 872 $$ = declarator_1_struct_union($1); 873 } 874 | notype_member_decls { 875 symtyp = FMEMBER; 876 } T_COMMA type_member_decl { 877 $$ = lnklst($1, declarator_1_struct_union($4)); 878 } 879 ; 880 881 type_member_decls: 882 type_member_decl { 883 $$ = declarator_1_struct_union($1); 884 } 885 | type_member_decls { 886 symtyp = FMEMBER; 887 } T_COMMA type_member_decl { 888 $$ = lnklst($1, declarator_1_struct_union($4)); 889 } 890 ; 891 892 notype_member_decl: 893 notype_decl { 894 $$ = $1; 895 } 896 | notype_decl T_COLON constant_expr { /* C99 6.7.2.1 */ 897 $$ = bitfield($1, to_int_constant($3, true)); 898 } 899 | { 900 symtyp = FVFT; 901 } T_COLON constant_expr { /* C99 6.7.2.1 */ 902 $$ = bitfield(NULL, to_int_constant($3, true)); 903 } 904 ; 905 906 type_member_decl: 907 type_decl { 908 $$ = $1; 909 } 910 | type_decl T_COLON constant_expr { 911 $$ = bitfield($1, to_int_constant($3, true)); 912 } 913 | { 914 symtyp = FVFT; 915 } T_COLON constant_expr { 916 $$ = bitfield(NULL, to_int_constant($3, true)); 917 } 918 ; 919 920 enum_spec: 921 enum enum_tag { 922 $$ = mktag($2, ENUM, false, false); 923 } 924 | enum enum_tag { 925 dcs->d_tagtyp = mktag($2, ENUM, true, false); 926 } enum_declaration { 927 $$ = complete_tag_enum(dcs->d_tagtyp, $4); 928 } 929 | enum { 930 dcs->d_tagtyp = mktag(NULL, ENUM, true, false); 931 } enum_declaration { 932 $$ = complete_tag_enum(dcs->d_tagtyp, $3); 933 } 934 | enum error { 935 symtyp = FVFT; 936 $$ = gettyp(INT); 937 } 938 ; 939 940 enum: 941 T_ENUM { 942 symtyp = FTAG; 943 pushdecl(CTCONST); 944 } 945 ; 946 947 enum_tag: 948 identifier { 949 $$ = getsym($1); 950 } 951 ; 952 953 enum_declaration: 954 enum_decl_lbrace enums_with_opt_comma T_RBRACE { 955 $$ = $2; 956 } 957 ; 958 959 enum_decl_lbrace: 960 T_LBRACE { 961 symtyp = FVFT; 962 enumval = 0; 963 } 964 ; 965 966 enums_with_opt_comma: 967 enums { 968 $$ = $1; 969 } 970 | enums T_COMMA { 971 if (sflag) { 972 /* trailing ',' prohibited in enum declaration */ 973 error(54); 974 } else { 975 /* trailing ',' prohibited in enum declaration */ 976 c99ism(54); 977 } 978 $$ = $1; 979 } 980 ; 981 982 enums: 983 enumerator { 984 $$ = $1; 985 } 986 | enums T_COMMA enumerator { 987 $$ = lnklst($1, $3); 988 } 989 | error { 990 $$ = NULL; 991 } 992 ; 993 994 enumerator: 995 enumeration_constant { 996 $$ = enumeration_constant($1, enumval, true); 997 } 998 | enumeration_constant T_ASSIGN constant_expr { 999 $$ = enumeration_constant($1, to_int_constant($3, true), false); 1000 } 1001 ; 1002 1003 enumeration_constant: /* C99 6.4.4.3 */ 1004 identifier { 1005 $$ = getsym($1); 1006 } 1007 ; 1008 1009 1010 notype_init_decls: 1011 notype_init_decl 1012 | notype_init_decls T_COMMA type_init_decl 1013 ; 1014 1015 type_init_decls: 1016 type_init_decl 1017 | type_init_decls T_COMMA type_init_decl 1018 ; 1019 1020 notype_init_decl: 1021 notype_decl opt_asm_or_symbolrename { 1022 cgram_declare($1, false, $2); 1023 check_size($1); 1024 } 1025 | notype_decl opt_asm_or_symbolrename { 1026 begin_initialization($1); 1027 cgram_declare($1, true, $2); 1028 } T_ASSIGN initializer { 1029 check_size($1); 1030 end_initialization(); 1031 } 1032 ; 1033 1034 type_init_decl: 1035 type_decl opt_asm_or_symbolrename { 1036 cgram_declare($1, false, $2); 1037 check_size($1); 1038 } 1039 | type_decl opt_asm_or_symbolrename { 1040 begin_initialization($1); 1041 cgram_declare($1, true, $2); 1042 } T_ASSIGN initializer { 1043 check_size($1); 1044 end_initialization(); 1045 } 1046 ; 1047 1048 notype_decl: 1049 notype_direct_decl { 1050 $$ = $1; 1051 } 1052 | pointer notype_direct_decl { 1053 $$ = add_pointer($2, $1); 1054 } 1055 ; 1056 1057 notype_direct_decl: 1058 T_NAME { 1059 $$ = declarator_name(getsym($1)); 1060 } 1061 | T_LPAREN type_decl T_RPAREN { 1062 $$ = $2; 1063 } 1064 | type_attribute notype_direct_decl { 1065 $$ = $2; 1066 } 1067 | notype_direct_decl T_LBRACK T_RBRACK { 1068 $$ = add_array($1, false, 0); 1069 } 1070 | notype_direct_decl T_LBRACK constant_expr T_RBRACK { 1071 $$ = add_array($1, true, to_int_constant($3, false)); 1072 } 1073 | notype_direct_decl param_list opt_asm_or_symbolrename { 1074 $$ = add_function(symbolrename($1, $3), $2); 1075 popdecl(); 1076 block_level--; 1077 } 1078 | notype_direct_decl type_attribute_list 1079 ; 1080 1081 type_decl: 1082 type_direct_decl { 1083 $$ = $1; 1084 } 1085 | pointer type_direct_decl { 1086 $$ = add_pointer($2, $1); 1087 } 1088 ; 1089 1090 type_direct_decl: 1091 identifier { 1092 $$ = declarator_name(getsym($1)); 1093 } 1094 | T_LPAREN type_decl T_RPAREN { 1095 $$ = $2; 1096 } 1097 | type_attribute type_direct_decl { 1098 $$ = $2; 1099 } 1100 | type_direct_decl T_LBRACK T_RBRACK { 1101 $$ = add_array($1, false, 0); 1102 } 1103 | type_direct_decl T_LBRACK constant_expr T_RBRACK { 1104 $$ = add_array($1, true, to_int_constant($3, false)); 1105 } 1106 | type_direct_decl param_list opt_asm_or_symbolrename { 1107 $$ = add_function(symbolrename($1, $3), $2); 1108 popdecl(); 1109 block_level--; 1110 } 1111 | type_direct_decl type_attribute_list 1112 ; 1113 1114 /* 1115 * param_decl and notype_param_decl exist to avoid a conflict in 1116 * argument lists. A typename enclosed in parens should always be 1117 * treated as a typename, not an argument. 1118 * "typedef int a; f(int (a));" is "typedef int a; f(int foo(a));" 1119 * not "typedef int a; f(int a);" 1120 */ 1121 param_decl: 1122 direct_param_decl { 1123 $$ = $1; 1124 } 1125 | pointer direct_param_decl { 1126 $$ = add_pointer($2, $1); 1127 } 1128 ; 1129 1130 direct_param_decl: 1131 identifier type_attribute_list { 1132 $$ = declarator_name(getsym($1)); 1133 } 1134 | identifier { 1135 $$ = declarator_name(getsym($1)); 1136 } 1137 | T_LPAREN notype_param_decl T_RPAREN { 1138 $$ = $2; 1139 } 1140 | direct_param_decl T_LBRACK T_RBRACK { 1141 $$ = add_array($1, false, 0); 1142 } 1143 | direct_param_decl T_LBRACK constant_expr T_RBRACK { 1144 $$ = add_array($1, true, to_int_constant($3, false)); 1145 } 1146 | direct_param_decl param_list opt_asm_or_symbolrename { 1147 $$ = add_function(symbolrename($1, $3), $2); 1148 popdecl(); 1149 block_level--; 1150 } 1151 ; 1152 1153 notype_param_decl: 1154 direct_notype_param_decl { 1155 $$ = $1; 1156 } 1157 | pointer direct_notype_param_decl { 1158 $$ = add_pointer($2, $1); 1159 } 1160 ; 1161 1162 direct_notype_param_decl: 1163 identifier { 1164 $$ = declarator_name(getsym($1)); 1165 } 1166 | T_LPAREN notype_param_decl T_RPAREN { 1167 $$ = $2; 1168 } 1169 | direct_notype_param_decl T_LBRACK T_RBRACK { 1170 $$ = add_array($1, false, 0); 1171 } 1172 | direct_notype_param_decl T_LBRACK constant_expr T_RBRACK { 1173 $$ = add_array($1, true, to_int_constant($3, false)); 1174 } 1175 | direct_notype_param_decl param_list opt_asm_or_symbolrename { 1176 $$ = add_function(symbolrename($1, $3), $2); 1177 popdecl(); 1178 block_level--; 1179 } 1180 ; 1181 1182 pointer: 1183 asterisk { 1184 $$ = $1; 1185 } 1186 | asterisk type_qualifier_list { 1187 $$ = merge_pointers_and_qualifiers($1, $2); 1188 } 1189 | asterisk pointer { 1190 $$ = merge_pointers_and_qualifiers($1, $2); 1191 } 1192 | asterisk type_qualifier_list pointer { 1193 $$ = merge_pointers_and_qualifiers($1, $2); 1194 $$ = merge_pointers_and_qualifiers($$, $3); 1195 } 1196 ; 1197 1198 asterisk: 1199 T_ASTERISK { 1200 $$ = xcalloc(1, sizeof (pqinf_t)); 1201 $$->p_pcnt = 1; 1202 } 1203 ; 1204 1205 type_qualifier_list: 1206 type_qualifier { 1207 $$ = $1; 1208 } 1209 | type_qualifier_list type_qualifier { 1210 $$ = merge_pointers_and_qualifiers($1, $2); 1211 } 1212 ; 1213 1214 type_qualifier: 1215 T_QUAL { 1216 $$ = xcalloc(1, sizeof (pqinf_t)); 1217 if ($1 == CONST) { 1218 $$->p_const = true; 1219 } else if ($1 == VOLATILE) { 1220 $$->p_volatile = true; 1221 } else { 1222 lint_assert($1 == RESTRICT || $1 == THREAD); 1223 } 1224 } 1225 ; 1226 1227 param_list: 1228 id_list_lparen identifier_list T_RPAREN { 1229 $$ = $2; 1230 } 1231 | abstract_decl_param_list { 1232 $$ = $1; 1233 } 1234 ; 1235 1236 id_list_lparen: 1237 T_LPAREN { 1238 block_level++; 1239 pushdecl(PROTO_ARG); 1240 } 1241 ; 1242 1243 identifier_list: 1244 T_NAME { 1245 $$ = old_style_function_name(getsym($1)); 1246 } 1247 | identifier_list T_COMMA T_NAME { 1248 $$ = lnklst($1, old_style_function_name(getsym($3))); 1249 } 1250 | identifier_list error { 1251 $$ = $1; 1252 } 1253 ; 1254 1255 abstract_decl_param_list: 1256 abstract_decl_lparen T_RPAREN { 1257 $$ = NULL; 1258 } 1259 | abstract_decl_lparen vararg_parameter_type_list T_RPAREN { 1260 dcs->d_proto = true; 1261 $$ = $2; 1262 } 1263 | abstract_decl_lparen error T_RPAREN { 1264 $$ = NULL; 1265 } 1266 ; 1267 1268 abstract_decl_lparen: 1269 T_LPAREN { 1270 block_level++; 1271 pushdecl(PROTO_ARG); 1272 } 1273 ; 1274 1275 vararg_parameter_type_list: 1276 parameter_type_list { 1277 $$ = $1; 1278 } 1279 | parameter_type_list T_COMMA T_ELLIPSIS { 1280 dcs->d_vararg = true; 1281 $$ = $1; 1282 } 1283 | T_ELLIPSIS { 1284 if (sflag) { 1285 /* ANSI C requires formal parameter before '...' */ 1286 error(84); 1287 } else if (!tflag) { 1288 /* ANSI C requires formal parameter before '...' */ 1289 warning(84); 1290 } 1291 dcs->d_vararg = true; 1292 $$ = NULL; 1293 } 1294 ; 1295 1296 parameter_type_list: 1297 parameter_declaration { 1298 $$ = $1; 1299 } 1300 | parameter_type_list T_COMMA parameter_declaration { 1301 $$ = lnklst($1, $3); 1302 } 1303 ; 1304 1305 parameter_declaration: 1306 declmods deftyp { 1307 $$ = declare_argument(abstract_name(), false); 1308 } 1309 | declaration_specifiers deftyp { 1310 $$ = declare_argument(abstract_name(), false); 1311 } 1312 | declmods deftyp notype_param_decl { 1313 $$ = declare_argument($3, false); 1314 } 1315 /* 1316 * param_decl is needed because of following conflict: 1317 * "typedef int a; f(int (a));" could be parsed as 1318 * "function with argument a of type int", or 1319 * "function with an abstract argument of type function". 1320 * This grammar realizes the second case. 1321 */ 1322 | declaration_specifiers deftyp param_decl { 1323 $$ = declare_argument($3, false); 1324 } 1325 | declmods deftyp abstract_decl { 1326 $$ = declare_argument($3, false); 1327 } 1328 | declaration_specifiers deftyp abstract_decl { 1329 $$ = declare_argument($3, false); 1330 } 1331 ; 1332 1333 opt_asm_or_symbolrename: /* expect only one */ 1334 /* empty */ { 1335 $$ = NULL; 1336 } 1337 | T_ASM T_LPAREN T_STRING T_RPAREN { 1338 freeyyv(&$3, T_STRING); 1339 $$ = NULL; 1340 } 1341 | T_SYMBOLRENAME T_LPAREN T_NAME T_RPAREN { 1342 $$ = $3; 1343 } 1344 ; 1345 1346 initializer: /* C99 6.7.8 "Initialization" */ 1347 expr %prec T_COMMA { 1348 init_using_expr($1); 1349 } 1350 | init_lbrace init_rbrace { 1351 /* XXX: Empty braces are not covered by C99 6.7.8. */ 1352 } 1353 | init_lbrace initializer_list comma_opt init_rbrace 1354 | error 1355 ; 1356 1357 initializer_list: /* C99 6.7.8 "Initialization" */ 1358 initializer_list_item 1359 | initializer_list T_COMMA initializer_list_item 1360 ; 1361 1362 initializer_list_item: 1363 designation initializer 1364 | initializer 1365 ; 1366 1367 range: 1368 constant_expr { 1369 $$.lo = to_int_constant($1, true); 1370 $$.hi = $$.lo; 1371 } 1372 | constant_expr T_ELLIPSIS constant_expr { 1373 $$.lo = to_int_constant($1, true); 1374 $$.hi = to_int_constant($3, true); 1375 /* initialization with '[a...b]' is a GNU extension */ 1376 gnuism(340); 1377 } 1378 ; 1379 1380 designator: /* C99 6.7.8 "Initialization" */ 1381 T_LBRACK range T_RBRACK { 1382 designation_add_subscript($2); 1383 if (!Sflag) 1384 /* array initializer with des.s is a C9X feature */ 1385 warning(321); 1386 } 1387 | point identifier { 1388 if (!Sflag) 1389 /* struct or union member name in initializer is ... */ 1390 warning(313); 1391 designation_add_name($2); 1392 } 1393 ; 1394 1395 designator_list: /* C99 6.7.8 "Initialization" */ 1396 designator 1397 | designator_list designator 1398 ; 1399 1400 designation: /* C99 6.7.8 "Initialization" */ 1401 designator_list T_ASSIGN 1402 | identifier T_COLON { 1403 /* GCC style struct or union member name in initializer */ 1404 gnuism(315); 1405 designation_add_name($1); 1406 } 1407 ; 1408 1409 init_lbrace: 1410 T_LBRACE { 1411 init_lbrace(); 1412 } 1413 ; 1414 1415 init_rbrace: 1416 T_RBRACE { 1417 init_rbrace(); 1418 } 1419 ; 1420 1421 type_name: 1422 { 1423 pushdecl(ABSTRACT); 1424 } abstract_declaration { 1425 popdecl(); 1426 $$ = $2->s_type; 1427 } 1428 ; 1429 1430 abstract_declaration: 1431 noclass_declmods deftyp { 1432 $$ = declare_1_abstract(abstract_name()); 1433 } 1434 | noclass_declspecs deftyp { 1435 $$ = declare_1_abstract(abstract_name()); 1436 } 1437 | noclass_declmods deftyp abstract_decl { 1438 $$ = declare_1_abstract($3); 1439 } 1440 | noclass_declspecs deftyp abstract_decl { 1441 $$ = declare_1_abstract($3); 1442 } 1443 ; 1444 1445 abstract_decl: 1446 pointer { 1447 $$ = add_pointer(abstract_name(), $1); 1448 } 1449 | direct_abstract_decl { 1450 $$ = $1; 1451 } 1452 | pointer direct_abstract_decl { 1453 $$ = add_pointer($2, $1); 1454 } 1455 | T_TYPEOF term { 1456 $$ = mktempsym($2->tn_type); 1457 } 1458 ; 1459 1460 direct_abstract_decl: 1461 T_LPAREN abstract_decl T_RPAREN { 1462 $$ = $2; 1463 } 1464 | T_LBRACK T_RBRACK { 1465 $$ = add_array(abstract_name(), false, 0); 1466 } 1467 | T_LBRACK constant_expr T_RBRACK { 1468 $$ = add_array(abstract_name(), true, to_int_constant($2, false)); 1469 } 1470 | type_attribute direct_abstract_decl { 1471 $$ = $2; 1472 } 1473 | direct_abstract_decl T_LBRACK T_RBRACK { 1474 $$ = add_array($1, false, 0); 1475 } 1476 | direct_abstract_decl T_LBRACK constant_expr T_RBRACK { 1477 $$ = add_array($1, true, to_int_constant($3, false)); 1478 } 1479 | abstract_decl_param_list opt_asm_or_symbolrename { 1480 $$ = add_function(symbolrename(abstract_name(), $2), $1); 1481 popdecl(); 1482 block_level--; 1483 } 1484 | direct_abstract_decl abstract_decl_param_list opt_asm_or_symbolrename { 1485 $$ = add_function(symbolrename($1, $3), $2); 1486 popdecl(); 1487 block_level--; 1488 } 1489 | direct_abstract_decl type_attribute_list 1490 ; 1491 1492 non_expr_statement: 1493 labeled_statement 1494 | compound_statement 1495 | selection_statement 1496 | iteration_statement 1497 | jump_statement { 1498 seen_fallthrough = false; 1499 } 1500 | asm_statement 1501 1502 statement: /* C99 6.8 */ 1503 expr_statement 1504 | non_expr_statement 1505 ; 1506 1507 labeled_statement: /* C99 6.8.1 */ 1508 label statement 1509 ; 1510 1511 label: 1512 T_NAME T_COLON { 1513 symtyp = FLABEL; 1514 named_label(getsym($1)); 1515 } 1516 | T_CASE constant_expr T_COLON { 1517 case_label($2); 1518 seen_fallthrough = true; 1519 } 1520 | T_CASE constant_expr T_ELLIPSIS constant_expr T_COLON { 1521 /* XXX: We don't fill all cases */ 1522 case_label($2); 1523 seen_fallthrough = true; 1524 } 1525 | T_DEFAULT T_COLON { 1526 default_label(); 1527 seen_fallthrough = true; 1528 } 1529 ; 1530 1531 compound_statement: /* C99 6.8.2 */ 1532 compound_statement_lbrace compound_statement_rbrace 1533 | compound_statement_lbrace block_item_list compound_statement_rbrace 1534 ; 1535 1536 compound_statement_lbrace: 1537 T_LBRACE { 1538 block_level++; 1539 mem_block_level++; 1540 pushdecl(AUTO); 1541 } 1542 ; 1543 1544 compound_statement_rbrace: 1545 T_RBRACE { 1546 popdecl(); 1547 freeblk(); 1548 mem_block_level--; 1549 block_level--; 1550 seen_fallthrough = false; 1551 } 1552 ; 1553 1554 block_item_list: 1555 block_item 1556 | block_item_list block_item { 1557 if (!Sflag && $1 && !$2) 1558 /* declarations after statements is a C99 feature */ 1559 c99ism(327); 1560 } 1561 ; 1562 1563 block_item: 1564 statement { 1565 $$ = true; 1566 restore_warning_flags(); 1567 } 1568 | declaration { 1569 $$ = false; 1570 restore_warning_flags(); 1571 } 1572 ; 1573 1574 expr_statement: 1575 expr T_SEMI { 1576 expr($1, false, false, false, false); 1577 seen_fallthrough = false; 1578 } 1579 | T_SEMI { 1580 seen_fallthrough = false; 1581 } 1582 ; 1583 1584 /* 1585 * The following two productions are used to implement 1586 * ({ [[decl-list] stmt-list] }). 1587 * XXX: This is not well tested. 1588 */ 1589 expr_statement_val: 1590 expr T_SEMI { 1591 /* XXX: We should really do that only on the last name */ 1592 if ($1->tn_op == NAME) 1593 $1->tn_sym->s_used = true; 1594 $$ = $1; 1595 expr($1, false, false, false, false); 1596 seen_fallthrough = false; 1597 } 1598 | non_expr_statement { 1599 $$ = getnode(); 1600 $$->tn_type = gettyp(VOID); 1601 } 1602 ; 1603 1604 expr_statement_list: 1605 expr_statement_val 1606 | expr_statement_list expr_statement_val { 1607 $$ = $2; 1608 } 1609 ; 1610 1611 selection_statement: /* C99 6.8.4 */ 1612 if_without_else { 1613 save_warning_flags(); 1614 if2(); 1615 if3(false); 1616 } 1617 | if_without_else T_ELSE { 1618 save_warning_flags(); 1619 if2(); 1620 } statement { 1621 clear_warning_flags(); 1622 if3(true); 1623 } 1624 | if_without_else T_ELSE error { 1625 clear_warning_flags(); 1626 if3(false); 1627 } 1628 | switch_expr statement { 1629 clear_warning_flags(); 1630 switch2(); 1631 } 1632 | switch_expr error { 1633 clear_warning_flags(); 1634 switch2(); 1635 } 1636 ; 1637 1638 if_without_else: 1639 if_expr statement 1640 | if_expr error 1641 ; 1642 1643 if_expr: 1644 T_IF T_LPAREN expr T_RPAREN { 1645 if1($3); 1646 clear_warning_flags(); 1647 } 1648 ; 1649 1650 switch_expr: 1651 T_SWITCH T_LPAREN expr T_RPAREN { 1652 switch1($3); 1653 clear_warning_flags(); 1654 } 1655 ; 1656 1657 association: 1658 type_name T_COLON expr 1659 | T_DEFAULT T_COLON expr 1660 ; 1661 1662 association_list: 1663 association 1664 | association_list T_COMMA association 1665 ; 1666 1667 generic_expr: 1668 T_GENERIC T_LPAREN expr T_COMMA association_list T_RPAREN { 1669 $$ = $3; 1670 } 1671 ; 1672 1673 do_statement: 1674 do statement { 1675 clear_warning_flags(); 1676 } 1677 ; 1678 1679 iteration_statement: /* C99 6.8.5 */ 1680 while_expr statement { 1681 clear_warning_flags(); 1682 while2(); 1683 } 1684 | while_expr error { 1685 clear_warning_flags(); 1686 while2(); 1687 } 1688 | do_statement do_while_expr { 1689 do2($2); 1690 seen_fallthrough = false; 1691 } 1692 | do error { 1693 clear_warning_flags(); 1694 do2(NULL); 1695 } 1696 | for_exprs statement { 1697 clear_warning_flags(); 1698 for2(); 1699 popdecl(); 1700 block_level--; 1701 } 1702 | for_exprs error { 1703 clear_warning_flags(); 1704 for2(); 1705 popdecl(); 1706 block_level--; 1707 } 1708 ; 1709 1710 while_expr: 1711 T_WHILE T_LPAREN expr T_RPAREN { 1712 while1($3); 1713 clear_warning_flags(); 1714 } 1715 ; 1716 1717 do: 1718 T_DO { 1719 do1(); 1720 } 1721 ; 1722 1723 do_while_expr: 1724 T_WHILE T_LPAREN expr T_RPAREN T_SEMI { 1725 $$ = $3; 1726 } 1727 ; 1728 1729 for_start: 1730 T_FOR T_LPAREN { 1731 pushdecl(AUTO); 1732 block_level++; 1733 } 1734 ; 1735 for_exprs: 1736 for_start declaration_specifiers deftyp notype_init_decls T_SEMI 1737 opt_expr T_SEMI opt_expr T_RPAREN { 1738 /* variable declaration in for loop */ 1739 c99ism(325); 1740 for1(NULL, $6, $8); 1741 clear_warning_flags(); 1742 } 1743 | for_start opt_expr T_SEMI opt_expr T_SEMI opt_expr T_RPAREN { 1744 for1($2, $4, $6); 1745 clear_warning_flags(); 1746 } 1747 ; 1748 1749 opt_expr: 1750 /* empty */ { 1751 $$ = NULL; 1752 } 1753 | expr { 1754 $$ = $1; 1755 } 1756 ; 1757 1758 jump_statement: /* C99 6.8.6 */ 1759 goto identifier T_SEMI { 1760 do_goto(getsym($2)); 1761 } 1762 | goto error T_SEMI { 1763 symtyp = FVFT; 1764 } 1765 | T_CONTINUE T_SEMI { 1766 do_continue(); 1767 } 1768 | T_BREAK T_SEMI { 1769 do_break(); 1770 } 1771 | T_RETURN T_SEMI { 1772 do_return(NULL); 1773 } 1774 | T_RETURN expr T_SEMI { 1775 do_return($2); 1776 } 1777 ; 1778 1779 goto: 1780 T_GOTO { 1781 symtyp = FLABEL; 1782 } 1783 ; 1784 1785 asm_statement: 1786 T_ASM T_LPAREN read_until_rparen T_SEMI { 1787 setasm(); 1788 } 1789 | T_ASM T_QUAL T_LPAREN read_until_rparen T_SEMI { 1790 setasm(); 1791 } 1792 | T_ASM error 1793 ; 1794 1795 read_until_rparen: 1796 /* empty */ { 1797 ignore_up_to_rparen(); 1798 } 1799 ; 1800 1801 declaration_list: 1802 declaration { 1803 clear_warning_flags(); 1804 } 1805 | declaration_list declaration { 1806 clear_warning_flags(); 1807 } 1808 ; 1809 1810 constant_expr: /* C99 6.6 */ 1811 expr %prec T_ASSIGN { 1812 $$ = $1; 1813 } 1814 ; 1815 1816 expr: 1817 expr T_ASTERISK expr { 1818 $$ = build(MULT, $1, $3); 1819 } 1820 | expr T_MULTIPLICATIVE expr { 1821 $$ = build($2, $1, $3); 1822 } 1823 | expr T_ADDITIVE expr { 1824 $$ = build($2, $1, $3); 1825 } 1826 | expr T_SHIFT expr { 1827 $$ = build($2, $1, $3); 1828 } 1829 | expr T_RELATIONAL expr { 1830 $$ = build($2, $1, $3); 1831 } 1832 | expr T_EQUALITY expr { 1833 $$ = build($2, $1, $3); 1834 } 1835 | expr T_AMPER expr { 1836 $$ = build(BITAND, $1, $3); 1837 } 1838 | expr T_BITXOR expr { 1839 $$ = build(BITXOR, $1, $3); 1840 } 1841 | expr T_BITOR expr { 1842 $$ = build(BITOR, $1, $3); 1843 } 1844 | expr T_LOGAND expr { 1845 $$ = build(LOGAND, $1, $3); 1846 } 1847 | expr T_LOGOR expr { 1848 $$ = build(LOGOR, $1, $3); 1849 } 1850 | expr T_QUEST expr T_COLON expr { 1851 $$ = build(QUEST, $1, build(COLON, $3, $5)); 1852 } 1853 | expr T_ASSIGN expr { 1854 $$ = build(ASSIGN, $1, $3); 1855 } 1856 | expr T_OPASSIGN expr { 1857 $$ = build($2, $1, $3); 1858 } 1859 | expr T_COMMA expr { 1860 $$ = build(COMMA, $1, $3); 1861 } 1862 | term { 1863 $$ = $1; 1864 } 1865 | generic_expr { 1866 $$ = $1; 1867 } 1868 ; 1869 1870 term: 1871 T_NAME { 1872 /* XXX really necessary? */ 1873 if (yychar < 0) 1874 yychar = yylex(); 1875 $$ = new_name_node(getsym($1), yychar); 1876 } 1877 | string { 1878 $$ = new_string_node($1); 1879 } 1880 | T_CON { 1881 $$ = new_constant_node(gettyp($1->v_tspec), $1); 1882 } 1883 | T_LPAREN expr T_RPAREN { 1884 if ($2 != NULL) 1885 $2->tn_parenthesized = true; 1886 $$ = $2; 1887 } 1888 | T_LPAREN compound_statement_lbrace declaration_list 1889 expr_statement_list { 1890 block_level--; 1891 mem_block_level--; 1892 /* XXX: probably does not need the full initialization code */ 1893 begin_initialization(mktempsym(duptyp($4->tn_type))); 1894 mem_block_level++; 1895 block_level++; 1896 /* ({ }) is a GCC extension */ 1897 gnuism(320); 1898 } compound_statement_rbrace T_RPAREN { 1899 $$ = new_name_node(*current_initsym(), 0); 1900 end_initialization(); 1901 } 1902 | T_LPAREN compound_statement_lbrace expr_statement_list { 1903 block_level--; 1904 mem_block_level--; 1905 /* XXX: probably does not need the full initialization code */ 1906 begin_initialization(mktempsym($3->tn_type)); 1907 mem_block_level++; 1908 block_level++; 1909 /* ({ }) is a GCC extension */ 1910 gnuism(320); 1911 } compound_statement_rbrace T_RPAREN { 1912 $$ = new_name_node(*current_initsym(), 0); 1913 end_initialization(); 1914 } 1915 | term T_INCDEC { 1916 $$ = build($2 == INC ? INCAFT : DECAFT, $1, NULL); 1917 } 1918 | T_INCDEC term { 1919 $$ = build($1 == INC ? INCBEF : DECBEF, $2, NULL); 1920 } 1921 | T_ASTERISK term { 1922 $$ = build(INDIR, $2, NULL); 1923 } 1924 | T_AMPER term { 1925 $$ = build(ADDR, $2, NULL); 1926 } 1927 | T_UNARY term { 1928 $$ = build($1, $2, NULL); 1929 } 1930 | T_ADDITIVE term { 1931 if (tflag && $1 == PLUS) { 1932 /* unary + is illegal in traditional C */ 1933 warning(100); 1934 } 1935 $$ = build($1 == PLUS ? UPLUS : UMINUS, $2, NULL); 1936 } 1937 | term T_LBRACK expr T_RBRACK { 1938 $$ = build(INDIR, build(PLUS, $1, $3), NULL); 1939 } 1940 | term T_LPAREN T_RPAREN { 1941 $$ = new_function_call_node($1, NULL); 1942 } 1943 | term T_LPAREN func_arg_list T_RPAREN { 1944 $$ = new_function_call_node($1, $3); 1945 } 1946 | term point_or_arrow T_NAME { 1947 if ($1 != NULL) { 1948 sym_t *msym; 1949 /* 1950 * XXX struct_or_union_member should be integrated 1951 * in build() 1952 */ 1953 if ($2 == ARROW) { 1954 /* 1955 * must do this before struct_or_union_member 1956 * is called 1957 */ 1958 $1 = cconv($1); 1959 } 1960 msym = struct_or_union_member($1, $2, getsym($3)); 1961 $$ = build($2, $1, new_name_node(msym, 0)); 1962 } else { 1963 $$ = NULL; 1964 } 1965 } 1966 | T_REAL term { 1967 $$ = build(REAL, $2, NULL); 1968 } 1969 | T_IMAG term { 1970 $$ = build(IMAG, $2, NULL); 1971 } 1972 | T_EXTENSION term { 1973 $$ = $2; 1974 } 1975 | T_REAL T_LPAREN term T_RPAREN { 1976 $$ = build(REAL, $3, NULL); 1977 } 1978 | T_IMAG T_LPAREN term T_RPAREN { 1979 $$ = build(IMAG, $3, NULL); 1980 } 1981 | T_BUILTIN_OFFSETOF T_LPAREN type_name T_COMMA identifier T_RPAREN { 1982 symtyp = FMEMBER; 1983 $$ = build_offsetof($3, getsym($5)); 1984 } 1985 | T_SIZEOF term { 1986 $$ = $2 == NULL ? NULL : build_sizeof($2->tn_type); 1987 if ($$ != NULL) 1988 check_expr_misc($2, false, false, false, false, false, true); 1989 } 1990 | T_SIZEOF T_LPAREN type_name T_RPAREN %prec T_SIZEOF { 1991 $$ = build_sizeof($3); 1992 } 1993 | T_ALIGNOF T_LPAREN type_name T_RPAREN { 1994 $$ = build_alignof($3); 1995 } 1996 | T_LPAREN type_name T_RPAREN term %prec T_UNARY { 1997 $$ = cast($4, $2); 1998 } 1999 | T_LPAREN type_name T_RPAREN { /* C99 6.5.2.5 "Compound literals" */ 2000 sym_t *tmp = mktempsym($2); 2001 begin_initialization(tmp); 2002 cgram_declare(tmp, true, NULL); 2003 } init_lbrace initializer_list comma_opt init_rbrace { 2004 if (!Sflag) 2005 /* compound literals are a C9X/GCC extension */ 2006 gnuism(319); 2007 $$ = new_name_node(*current_initsym(), 0); 2008 end_initialization(); 2009 } 2010 ; 2011 2012 string: 2013 T_STRING { 2014 $$ = $1; 2015 } 2016 | T_STRING string2 { 2017 $$ = cat_strings($1, $2); 2018 } 2019 ; 2020 2021 string2: 2022 T_STRING { 2023 if (tflag) { 2024 /* concatenated strings are illegal in traditional C */ 2025 warning(219); 2026 } 2027 $$ = $1; 2028 } 2029 | string2 T_STRING { 2030 $$ = cat_strings($1, $2); 2031 } 2032 ; 2033 2034 func_arg_list: 2035 expr %prec T_COMMA { 2036 $$ = new_function_argument_node(NULL, $1); 2037 } 2038 | func_arg_list T_COMMA expr { 2039 $$ = new_function_argument_node($1, $3); 2040 } 2041 ; 2042 2043 point_or_arrow: 2044 T_MEMBACC { 2045 symtyp = FMEMBER; 2046 $$ = $1; 2047 } 2048 ; 2049 2050 point: 2051 T_MEMBACC { 2052 if ($1 != POINT) { 2053 /* syntax error '%s' */ 2054 error(249, yytext); 2055 } 2056 } 2057 ; 2058 2059 identifier: /* C99 6.4.2.1 */ 2060 T_NAME { 2061 $$ = $1; 2062 cgram_debug("name '%s'", $$->sb_name); 2063 } 2064 | T_TYPENAME { 2065 $$ = $1; 2066 cgram_debug("typename '%s'", $$->sb_name); 2067 } 2068 ; 2069 2070 comma_opt: 2071 T_COMMA 2072 | /* empty */ 2073 ; 2074 %% 2075 2076 /* ARGSUSED */ 2077 int 2078 yyerror(const char *msg) 2079 { 2080 /* syntax error '%s' */ 2081 error(249, yytext); 2082 if (++sytxerr >= 5) 2083 norecover(); 2084 return 0; 2085 } 2086 2087 static void 2088 cgram_declare(sym_t *decl, bool initflg, sbuf_t *renaming) 2089 { 2090 declare(decl, initflg, renaming); 2091 if (renaming != NULL) 2092 freeyyv(&renaming, T_NAME); 2093 } 2094 2095 /* 2096 * Discard all input tokens up to and including the next 2097 * unmatched right paren 2098 */ 2099 static void 2100 ignore_up_to_rparen(void) 2101 { 2102 int level; 2103 2104 if (yychar < 0) 2105 yychar = yylex(); 2106 freeyyv(&yylval, yychar); 2107 2108 level = 1; 2109 while (yychar != T_RPAREN || --level > 0) { 2110 if (yychar == T_LPAREN) { 2111 level++; 2112 } else if (yychar <= 0) { 2113 break; 2114 } 2115 freeyyv(&yylval, yychar = yylex()); 2116 } 2117 2118 yyclearin; 2119 } 2120 2121 static sym_t * 2122 symbolrename(sym_t *s, sbuf_t *sb) 2123 { 2124 if (sb) 2125 s->s_rename = sb->sb_name; 2126 return s; 2127 } 2128
Indexes created Thu Oct 02 14:10:14 GMT 2025