cgram.y revision 1.319
1 %{ 2 /* $NetBSD: cgram.y,v 1.319 2021/07/12 21:43:44 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 1.319 2021/07/12 21:43:44 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 %} 126 127 %expect 165 128 129 %union { 130 val_t *y_val; 131 sbuf_t *y_name; 132 sym_t *y_sym; 133 op_t y_op; 134 scl_t y_scl; 135 tspec_t y_tspec; 136 tqual_t y_tqual; 137 type_t *y_type; 138 tnode_t *y_tnode; 139 range_t y_range; 140 strg_t *y_string; 141 qual_ptr *y_qual_ptr; 142 bool y_seen_statement; 143 struct generic_association *y_generic; 144 }; 145 146 %token T_LBRACE T_RBRACE T_LBRACK T_RBRACK T_LPAREN T_RPAREN 147 %token T_POINT T_ARROW 148 %token T_COMPLEMENT T_LOGNOT 149 %token <y_op> T_INCDEC 150 %token T_SIZEOF 151 %token T_BUILTIN_OFFSETOF 152 %token T_TYPEOF 153 %token T_EXTENSION 154 %token T_ALIGNAS 155 %token T_ALIGNOF 156 %token T_ASTERISK 157 %token <y_op> T_MULTIPLICATIVE 158 %token <y_op> T_ADDITIVE 159 %token <y_op> T_SHIFT 160 %token <y_op> T_RELATIONAL 161 %token <y_op> T_EQUALITY 162 %token T_AMPER 163 %token T_BITXOR 164 %token T_BITOR 165 %token T_LOGAND 166 %token T_LOGOR 167 %token T_QUEST 168 %token T_COLON 169 %token T_ASSIGN 170 %token <y_op> T_OPASSIGN 171 %token T_COMMA 172 %token T_SEMI 173 %token T_ELLIPSIS 174 %token T_REAL 175 %token T_IMAG 176 %token T_GENERIC 177 %token T_NORETURN 178 179 /* storage classes (extern, static, auto, register and typedef) */ 180 %token <y_scl> T_SCLASS 181 182 /* 183 * predefined type keywords (char, int, short, long, unsigned, signed, 184 * float, double, void); see T_TYPENAME 185 */ 186 %token <y_tspec> T_TYPE 187 188 /* qualifiers (const, volatile, restrict, _Thread_local) */ 189 %token <y_tqual> T_QUAL 190 191 /* struct or union */ 192 %token <y_tspec> T_STRUCT_OR_UNION 193 194 /* remaining keywords */ 195 %token T_ASM 196 %token T_BREAK 197 %token T_CASE 198 %token T_CONTINUE 199 %token T_DEFAULT 200 %token T_DO 201 %token T_ELSE 202 %token T_ENUM 203 %token T_FOR 204 %token T_GOTO 205 %token T_IF 206 %token T_PACKED 207 %token T_RETURN 208 %token T_SWITCH 209 %token T_SYMBOLRENAME 210 %token T_WHILE 211 212 %token T_ATTRIBUTE 213 %token T_AT_ALIAS 214 %token T_AT_ALIGNED 215 %token T_AT_ALLOC_SIZE 216 %token T_AT_ALWAYS_INLINE 217 %token T_AT_BOUNDED 218 %token T_AT_BUFFER 219 %token T_AT_COLD 220 %token T_AT_COMMON 221 %token T_AT_CONSTRUCTOR 222 %token T_AT_DEPRECATED 223 %token T_AT_DESTRUCTOR 224 %token T_AT_FALLTHROUGH 225 %token T_AT_FORMAT 226 %token T_AT_FORMAT_ARG 227 %token T_AT_FORMAT_GNU_PRINTF 228 %token T_AT_FORMAT_PRINTF 229 %token T_AT_FORMAT_SCANF 230 %token T_AT_FORMAT_STRFMON 231 %token T_AT_FORMAT_STRFTIME 232 %token T_AT_FORMAT_SYSLOG 233 %token T_AT_GNU_INLINE 234 %token T_AT_HOT 235 %token T_AT_MALLOC 236 %token T_AT_MAY_ALIAS 237 %token T_AT_MINBYTES 238 %token T_AT_MODE 239 %token T_AT_NOINLINE 240 %token T_AT_NONNULL 241 %token T_AT_NONSTRING 242 %token T_AT_NORETURN 243 %token T_AT_NOTHROW 244 %token T_AT_NO_INSTRUMENT_FUNCTION 245 %token T_AT_OPTIMIZE 246 %token T_AT_PACKED 247 %token T_AT_PCS 248 %token T_AT_PURE 249 %token T_AT_RETURNS_TWICE 250 %token T_AT_SECTION 251 %token T_AT_SENTINEL 252 %token T_AT_STRING 253 %token T_AT_TLS_MODEL 254 %token T_AT_TUNION 255 %token T_AT_UNUSED 256 %token T_AT_USED 257 %token T_AT_VISIBILITY 258 %token T_AT_WARN_UNUSED_RESULT 259 %token T_AT_WEAK 260 261 %left T_THEN 262 %left T_ELSE 263 %left T_COMMA 264 %right T_ASSIGN T_OPASSIGN 265 %right T_QUEST T_COLON 266 %left T_LOGOR 267 %left T_LOGAND 268 %left T_BITOR 269 %left T_BITXOR 270 %left T_AMPER 271 %left T_EQUALITY 272 %left T_RELATIONAL 273 %left T_SHIFT 274 %left T_ADDITIVE 275 %left T_ASTERISK T_MULTIPLICATIVE 276 277 %token <y_name> T_NAME 278 %token <y_name> T_TYPENAME 279 %token <y_val> T_CON 280 %token <y_string> T_STRING 281 282 %type <y_tnode> primary_expression 283 %type <y_tnode> postfix_expression 284 %type <y_tnode> argument_expression_list 285 %type <y_tnode> unary_expression 286 %type <y_tnode> cast_expression 287 %type <y_tnode> expr 288 289 %type <y_sym> func_decl 290 %type <y_sym> notype_decl 291 %type <y_sym> type_decl 292 %type <y_type> type_specifier 293 %type <y_type> begin_type_typespec 294 %type <y_type> notype_type_specifier 295 %type <y_type> struct_or_union_specifier 296 %type <y_type> enum_specifier 297 %type <y_tspec> struct_or_union 298 %type <y_sym> braced_struct_declaration_list 299 %type <y_sym> identifier_sym 300 %type <y_name> identifier 301 %type <y_sym> struct_declaration_list_with_rbrace 302 %type <y_sym> struct_declaration_list 303 %type <y_sym> struct_declaration 304 %type <y_sym> notype_member_decls 305 %type <y_sym> type_member_decls 306 %type <y_sym> notype_member_decl 307 %type <y_sym> type_member_decl 308 %type <y_tnode> constant_expr 309 %type <y_tnode> array_size 310 %type <y_sym> enum_declaration 311 %type <y_sym> enums_with_opt_comma 312 %type <y_sym> enumerator_list 313 %type <y_sym> enumerator 314 %type <y_sym> notype_direct_decl 315 %type <y_sym> type_direct_decl 316 %type <y_qual_ptr> pointer 317 %type <y_qual_ptr> asterisk 318 %type <y_sym> type_param_decl 319 %type <y_sym> param_list 320 %type <y_sym> abstract_decl_param_list 321 %type <y_sym> direct_param_decl 322 %type <y_sym> notype_param_decl 323 %type <y_sym> direct_notype_param_decl 324 %type <y_qual_ptr> type_qualifier_list_opt 325 %type <y_qual_ptr> type_qualifier_list 326 %type <y_qual_ptr> type_qualifier 327 %type <y_sym> identifier_list 328 %type <y_sym> abstract_declarator 329 %type <y_sym> direct_abstract_declarator 330 %type <y_sym> vararg_parameter_type_list 331 %type <y_sym> parameter_type_list 332 %type <y_sym> parameter_declaration 333 %type <y_tnode> assignment_expression 334 %type <y_tnode> gcc_statement_expr_list 335 %type <y_tnode> gcc_statement_expr_item 336 %type <y_tnode> generic_selection 337 %type <y_op> point_or_arrow 338 %type <y_type> type_name 339 %type <y_sym> abstract_declaration 340 %type <y_tnode> do_while_expr 341 %type <y_tnode> expr_opt 342 %type <y_string> string 343 %type <y_string> string2 344 %type <y_name> asm_or_symbolrename_opt 345 %type <y_range> range 346 %type <y_seen_statement> block_item_list 347 %type <y_seen_statement> block_item 348 %type <y_generic> generic_assoc_list 349 %type <y_generic> generic_association 350 351 %% 352 353 program: 354 /* empty */ { 355 if (sflag) { 356 /* empty translation unit */ 357 error(272); 358 } else if (!tflag) { 359 /* empty translation unit */ 360 warning(272); 361 } 362 } 363 | translation_unit 364 ; 365 366 identifier_sym: /* helper for struct/union/enum */ 367 identifier { 368 $$ = getsym($1); 369 } 370 ; 371 372 /* K&R ???, C90 ???, C99 6.4.2.1, C11 ???, C18 ??? */ 373 identifier: 374 T_NAME { 375 $$ = $1; 376 cgram_debug("name '%s'", $$->sb_name); 377 } 378 | T_TYPENAME { 379 $$ = $1; 380 cgram_debug("typename '%s'", $$->sb_name); 381 } 382 ; 383 384 /* see C99 6.4.5, string literals are joined by 5.1.1.2 */ 385 string: 386 T_STRING 387 | T_STRING string2 { 388 $$ = cat_strings($1, $2); 389 } 390 ; 391 392 /* see C99 6.4.5, string literals are joined by 5.1.1.2 */ 393 string2: 394 T_STRING { 395 if (tflag) { 396 /* concatenated strings are illegal in traditional C */ 397 warning(219); 398 } 399 $$ = $1; 400 } 401 | string2 T_STRING { 402 $$ = cat_strings($1, $2); 403 } 404 ; 405 406 /* K&R 7.1, C90 ???, C99 6.5.1, C11 6.5.1, C18 6.5.1 */ 407 primary_expression: 408 T_NAME { 409 /* XXX really necessary? */ 410 if (yychar < 0) 411 yychar = yylex(); 412 $$ = new_name_node(getsym($1), yychar); 413 } 414 | T_CON { 415 $$ = expr_new_constant(gettyp($1->v_tspec), $1); 416 } 417 | string { 418 $$ = new_string_node($1); 419 } 420 | T_LPAREN expr T_RPAREN { 421 if ($2 != NULL) 422 $2->tn_parenthesized = true; 423 $$ = $2; 424 } 425 | generic_selection 426 /* GCC primary-expression, see c_parser_postfix_expression */ 427 | T_BUILTIN_OFFSETOF T_LPAREN type_name T_COMMA identifier T_RPAREN { 428 symtyp = FMEMBER; 429 $$ = build_offsetof($3, getsym($5)); 430 } 431 ; 432 433 /* K&R ---, C90 ---, C99 ---, C11 6.5.1.1, C18 6.5.1.1 */ 434 generic_selection: 435 T_GENERIC T_LPAREN assignment_expression T_COMMA 436 generic_assoc_list T_RPAREN { 437 /* generic selection requires C11 or later */ 438 c11ism(345); 439 $$ = build_generic_selection($3, $5); 440 } 441 ; 442 443 /* K&R ---, C90 ---, C99 ---, C11 6.5.1.1, C18 6.5.1.1 */ 444 generic_assoc_list: 445 generic_association 446 | generic_assoc_list T_COMMA generic_association { 447 $3->ga_prev = $1; 448 $$ = $3; 449 } 450 ; 451 452 /* K&R ---, C90 ---, C99 ---, C11 6.5.1.1, C18 6.5.1.1 */ 453 generic_association: 454 type_name T_COLON assignment_expression { 455 $$ = getblk(sizeof(*$$)); 456 $$->ga_arg = $1; 457 $$->ga_result = $3; 458 } 459 | T_DEFAULT T_COLON assignment_expression { 460 $$ = getblk(sizeof(*$$)); 461 $$->ga_arg = NULL; 462 $$->ga_result = $3; 463 } 464 ; 465 466 /* K&R 7.1, C90 ???, C99 6.5.2, C11 6.5.2, C18 6.5.2 */ 467 postfix_expression: 468 primary_expression 469 | postfix_expression T_LBRACK expr T_RBRACK { 470 $$ = build(INDIR, build(PLUS, $1, $3), NULL); 471 } 472 | postfix_expression T_LPAREN T_RPAREN { 473 $$ = new_function_call_node($1, NULL); 474 } 475 | postfix_expression T_LPAREN argument_expression_list T_RPAREN { 476 $$ = new_function_call_node($1, $3); 477 } 478 | postfix_expression point_or_arrow T_NAME { 479 if ($1 != NULL) { 480 sym_t *msym; 481 /* 482 * XXX struct_or_union_member should be integrated 483 * in build() 484 */ 485 if ($2 == ARROW) { 486 /* 487 * must do this before struct_or_union_member 488 * is called 489 */ 490 $1 = cconv($1); 491 } 492 msym = struct_or_union_member($1, $2, getsym($3)); 493 $$ = build($2, $1, new_name_node(msym, 0)); 494 } else { 495 $$ = NULL; 496 } 497 } 498 | postfix_expression T_INCDEC { 499 $$ = build($2 == INC ? INCAFT : DECAFT, $1, NULL); 500 } 501 | T_LPAREN type_name T_RPAREN { /* C99 6.5.2.5 "Compound literals" */ 502 sym_t *tmp = mktempsym($2); 503 begin_initialization(tmp); 504 cgram_declare(tmp, true, NULL); 505 } init_lbrace initializer_list comma_opt init_rbrace { 506 if (!Sflag) 507 /* compound literals are a C9X/GCC extension */ 508 gnuism(319); 509 $$ = new_name_node(*current_initsym(), 0); 510 end_initialization(); 511 } 512 | T_LPAREN compound_statement_lbrace gcc_statement_expr_list { 513 block_level--; 514 mem_block_level--; 515 begin_initialization(mktempsym(dup_type($3->tn_type))); 516 mem_block_level++; 517 block_level++; 518 /* ({ }) is a GCC extension */ 519 gnuism(320); 520 } compound_statement_rbrace T_RPAREN { 521 $$ = new_name_node(*current_initsym(), 0); 522 end_initialization(); 523 } 524 ; 525 526 comma_opt: /* helper for 'postfix_expression' */ 527 /* empty */ 528 | T_COMMA 529 ; 530 531 /* 532 * The inner part of a GCC statement-expression of the form ({ ... }). 533 * 534 * https://gcc.gnu.org/onlinedocs/gcc/Statement-Exprs.html 535 */ 536 gcc_statement_expr_list: 537 gcc_statement_expr_item 538 | gcc_statement_expr_list gcc_statement_expr_item { 539 $$ = $2; 540 } 541 ; 542 543 gcc_statement_expr_item: 544 declaration { 545 clear_warning_flags(); 546 $$ = NULL; 547 } 548 | non_expr_statement { 549 $$ = expr_zalloc_tnode(); 550 $$->tn_type = gettyp(VOID); 551 } 552 | expr T_SEMI { 553 if ($1 == NULL) { /* in case of syntax errors */ 554 $$ = expr_zalloc_tnode(); 555 $$->tn_type = gettyp(VOID); 556 } else { 557 /* XXX: do that only on the last name */ 558 if ($1->tn_op == NAME) 559 $1->tn_sym->s_used = true; 560 $$ = $1; 561 expr($1, false, false, false, false); 562 seen_fallthrough = false; 563 } 564 } 565 ; 566 567 point_or_arrow: /* helper for 'postfix_expression' */ 568 T_POINT { 569 symtyp = FMEMBER; 570 $$ = POINT; 571 } 572 | T_ARROW { 573 symtyp = FMEMBER; 574 $$ = ARROW; 575 } 576 ; 577 578 /* K&R 7.1, C90 ???, C99 6.5.2, C11 6.5.2, C18 6.5.2 */ 579 argument_expression_list: 580 expr %prec T_COMMA { 581 $$ = new_function_argument_node(NULL, $1); 582 } 583 | argument_expression_list T_COMMA expr { 584 $$ = new_function_argument_node($1, $3); 585 } 586 ; 587 588 /* K&R 7.2, C90 ???, C99 6.5.3, C11 6.5.3, C18 6.5.3 */ 589 unary_expression: 590 postfix_expression 591 | T_INCDEC unary_expression { 592 $$ = build($1 == INC ? INCBEF : DECBEF, $2, NULL); 593 } 594 | T_AMPER cast_expression { 595 $$ = build(ADDR, $2, NULL); 596 } 597 | T_ASTERISK cast_expression { 598 $$ = build(INDIR, $2, NULL); 599 } 600 | T_ADDITIVE cast_expression { 601 if (tflag && $1 == PLUS) { 602 /* unary + is illegal in traditional C */ 603 warning(100); 604 } 605 $$ = build($1 == PLUS ? UPLUS : UMINUS, $2, NULL); 606 } 607 | T_COMPLEMENT cast_expression { 608 $$ = build(COMPL, $2, NULL); 609 } 610 | T_LOGNOT cast_expression { 611 $$ = build(NOT, $2, NULL); 612 } 613 | T_REAL cast_expression { /* GCC c_parser_unary_expression */ 614 $$ = build(REAL, $2, NULL); 615 } 616 | T_IMAG cast_expression { /* GCC c_parser_unary_expression */ 617 $$ = build(IMAG, $2, NULL); 618 } 619 | T_EXTENSION cast_expression { /* GCC c_parser_unary_expression */ 620 $$ = $2; 621 } 622 | T_SIZEOF unary_expression { 623 $$ = $2 == NULL ? NULL : build_sizeof($2->tn_type); 624 if ($$ != NULL) 625 check_expr_misc($2, false, false, false, false, false, true); 626 } 627 | T_SIZEOF T_LPAREN type_name T_RPAREN { 628 $$ = build_sizeof($3); 629 } 630 /* K&R ---, C90 ---, C99 ---, C11 6.5.3, C18 6.5.3 */ 631 | T_ALIGNOF T_LPAREN type_name T_RPAREN { 632 $$ = build_alignof($3); 633 } 634 ; 635 636 /* The rule 'unary_operator' is inlined into unary_expression. */ 637 638 /* K&R 7.2, C90 ???, C99 6.5.4, C11 6.5.4, C18 6.5.4 */ 639 cast_expression: 640 unary_expression 641 | T_LPAREN type_name T_RPAREN cast_expression { 642 $$ = cast($4, $2); 643 } 644 ; 645 646 expr_opt: 647 /* empty */ { 648 $$ = NULL; 649 } 650 | expr 651 ; 652 653 /* 'expression' also implements 'multiplicative_expression'. */ 654 /* 'expression' also implements 'additive_expression'. */ 655 /* 'expression' also implements 'shift_expression'. */ 656 /* 'expression' also implements 'relational_expression'. */ 657 /* 'expression' also implements 'equality_expression'. */ 658 /* 'expression' also implements 'AND_expression'. */ 659 /* 'expression' also implements 'exclusive_OR_expression'. */ 660 /* 'expression' also implements 'inclusive_OR_expression'. */ 661 /* 'expression' also implements 'logical_AND_expression'. */ 662 /* 'expression' also implements 'logical_OR_expression'. */ 663 /* 'expression' also implements 'conditional_expression'. */ 664 /* 'expression' also implements 'assignment_expression'. */ 665 /* TODO: rename to 'expression' */ 666 /* K&R ???, C90 ???, C99 6.5.5 to 6.5.17, C11 ???, C18 ??? */ 667 expr: 668 expr T_ASTERISK expr { 669 $$ = build(MULT, $1, $3); 670 } 671 | expr T_MULTIPLICATIVE expr { 672 $$ = build($2, $1, $3); 673 } 674 | expr T_ADDITIVE expr { 675 $$ = build($2, $1, $3); 676 } 677 | expr T_SHIFT expr { 678 $$ = build($2, $1, $3); 679 } 680 | expr T_RELATIONAL expr { 681 $$ = build($2, $1, $3); 682 } 683 | expr T_EQUALITY expr { 684 $$ = build($2, $1, $3); 685 } 686 | expr T_AMPER expr { 687 $$ = build(BITAND, $1, $3); 688 } 689 | expr T_BITXOR expr { 690 $$ = build(BITXOR, $1, $3); 691 } 692 | expr T_BITOR expr { 693 $$ = build(BITOR, $1, $3); 694 } 695 | expr T_LOGAND expr { 696 $$ = build(LOGAND, $1, $3); 697 } 698 | expr T_LOGOR expr { 699 $$ = build(LOGOR, $1, $3); 700 } 701 | expr T_QUEST expr T_COLON expr { 702 $$ = build(QUEST, $1, build(COLON, $3, $5)); 703 } 704 | expr T_ASSIGN expr { 705 $$ = build(ASSIGN, $1, $3); 706 } 707 | expr T_OPASSIGN expr { 708 $$ = build($2, $1, $3); 709 } 710 | expr T_COMMA expr { 711 $$ = build(COMMA, $1, $3); 712 } 713 | cast_expression 714 ; 715 716 /* K&R ???, C90 ???, C99 6.5.16, C11 ???, C18 ??? */ 717 assignment_expression: 718 expr %prec T_ASSIGN 719 ; 720 721 constant_expr_list_opt: /* helper for gcc_attribute */ 722 /* empty */ 723 | constant_expr_list 724 ; 725 726 constant_expr_list: /* helper for gcc_attribute */ 727 constant_expr 728 | constant_expr_list T_COMMA constant_expr 729 ; 730 731 constant_expr: /* C99 6.6 */ 732 expr %prec T_ASSIGN 733 ; 734 735 declaration: /* C99 6.7 */ 736 begin_type_declmods end_type T_SEMI { 737 if (dcs->d_scl == TYPEDEF) { 738 /* typedef declares no type name */ 739 warning(72); 740 } else { 741 /* empty declaration */ 742 warning(2); 743 } 744 } 745 | begin_type_declmods end_type notype_init_decls T_SEMI 746 | begin_type_declaration_specifiers end_type T_SEMI { 747 if (dcs->d_scl == TYPEDEF) { 748 /* typedef declares no type name */ 749 warning(72); 750 } else if (!dcs->d_nonempty_decl) { 751 /* empty declaration */ 752 warning(2); 753 } 754 } 755 | begin_type_declaration_specifiers end_type type_init_decls T_SEMI 756 | error T_SEMI 757 ; 758 759 begin_type_declaration_specifiers: /* see C99 6.7 */ 760 begin_type_typespec { 761 add_type($1); 762 } 763 | begin_type_declmods type_specifier { 764 add_type($2); 765 } 766 | type_attribute begin_type_declaration_specifiers 767 | begin_type_declaration_specifiers declmod 768 | begin_type_declaration_specifiers notype_type_specifier { 769 add_type($2); 770 } 771 ; 772 773 begin_type_declmods: /* see C99 6.7 */ 774 begin_type T_QUAL { 775 add_qualifier($2); 776 } 777 | begin_type T_SCLASS { 778 add_storage_class($2); 779 } 780 | begin_type_declmods declmod 781 ; 782 783 begin_type_noclass_declspecs: 784 begin_type_typespec { 785 add_type($1); 786 } 787 | type_attribute begin_type_noclass_declspecs 788 | begin_type_noclass_declmods type_specifier { 789 add_type($2); 790 } 791 | begin_type_noclass_declspecs T_QUAL { 792 add_qualifier($2); 793 } 794 | begin_type_noclass_declspecs notype_type_specifier { 795 add_type($2); 796 } 797 | begin_type_noclass_declspecs type_attribute 798 ; 799 800 begin_type_typespec: 801 begin_type notype_type_specifier { 802 $$ = $2; 803 } 804 | T_TYPENAME begin_type { 805 $$ = getsym($1)->s_type; 806 } 807 ; 808 809 begin_type_noclass_declmods: 810 begin_type T_QUAL { 811 add_qualifier($2); 812 } 813 | begin_type_noclass_declmods T_QUAL { 814 add_qualifier($2); 815 } 816 ; 817 818 declmod: 819 T_QUAL { 820 add_qualifier($1); 821 } 822 | T_SCLASS { 823 add_storage_class($1); 824 } 825 | type_attribute_list 826 ; 827 828 type_attribute_list: 829 type_attribute 830 | type_attribute_list type_attribute 831 ; 832 833 type_attribute_opt: 834 /* empty */ 835 | type_attribute 836 ; 837 838 type_attribute: /* See C11 6.7 declaration-specifiers */ 839 T_ATTRIBUTE T_LPAREN T_LPAREN { 840 attron = true; 841 } gcc_attribute_spec_list { 842 attron = false; 843 } T_RPAREN T_RPAREN 844 | T_ALIGNAS T_LPAREN align_as T_RPAREN 845 | T_PACKED { 846 addpacked(); 847 } 848 | T_NORETURN 849 ; 850 851 align_as: /* See alignment-specifier in C11 6.7.5 */ 852 type_specifier 853 | constant_expr 854 ; 855 856 begin_type: 857 /* empty */ { 858 begin_type(); 859 } 860 ; 861 862 end_type: 863 /* empty */ { 864 end_type(); 865 } 866 ; 867 868 type_specifier: /* C99 6.7.2 */ 869 notype_type_specifier 870 | T_TYPENAME { 871 $$ = getsym($1)->s_type; 872 } 873 ; 874 875 notype_type_specifier: /* see C99 6.7.2 */ 876 T_TYPE { 877 $$ = gettyp($1); 878 } 879 | T_TYPEOF cast_expression { /* GCC extension */ 880 $$ = $2->tn_type; 881 } 882 | struct_or_union_specifier { 883 end_declaration_level(); 884 $$ = $1; 885 } 886 | enum_specifier { 887 end_declaration_level(); 888 $$ = $1; 889 } 890 ; 891 892 struct_or_union_specifier: /* C99 6.7.2.1 */ 893 struct_or_union identifier_sym { 894 /* 895 * STDC requires that "struct a;" always introduces 896 * a new tag if "a" is not declared at current level 897 * 898 * yychar is valid because otherwise the parser would not 899 * have been able to decide if it must shift or reduce 900 */ 901 $$ = mktag($2, $1, false, yychar == T_SEMI); 902 } 903 | struct_or_union identifier_sym { 904 dcs->d_tagtyp = mktag($2, $1, true, false); 905 } braced_struct_declaration_list { 906 $$ = complete_tag_struct_or_union(dcs->d_tagtyp, $4); 907 } 908 | struct_or_union { 909 dcs->d_tagtyp = mktag(NULL, $1, true, false); 910 } braced_struct_declaration_list { 911 $$ = complete_tag_struct_or_union(dcs->d_tagtyp, $3); 912 } 913 | struct_or_union error { 914 symtyp = FVFT; 915 $$ = gettyp(INT); 916 } 917 ; 918 919 struct_or_union: /* C99 6.7.2.1 */ 920 struct_or_union type_attribute 921 | T_STRUCT_OR_UNION { 922 symtyp = FTAG; 923 begin_declaration_level($1 == STRUCT ? MOS : MOU); 924 dcs->d_offset = 0; 925 dcs->d_sou_align_in_bits = CHAR_SIZE; 926 $$ = $1; 927 } 928 ; 929 930 braced_struct_declaration_list: /* see C99 6.7.2.1 */ 931 struct_declaration_lbrace struct_declaration_list_with_rbrace { 932 $$ = $2; 933 } 934 ; 935 936 struct_declaration_lbrace: /* see C99 6.7.2.1 */ 937 T_LBRACE { 938 symtyp = FVFT; 939 } 940 ; 941 942 struct_declaration_list_with_rbrace: /* see C99 6.7.2.1 */ 943 struct_declaration_list T_SEMI T_RBRACE 944 | struct_declaration_list T_RBRACE { 945 if (sflag) { 946 /* syntax req. ';' after last struct/union member */ 947 error(66); 948 } else { 949 /* syntax req. ';' after last struct/union member */ 950 warning(66); 951 } 952 $$ = $1; 953 } 954 | T_RBRACE { 955 $$ = NULL; 956 } 957 ; 958 959 struct_declaration_list: /* C99 6.7.2.1 */ 960 struct_declaration 961 | struct_declaration_list T_SEMI struct_declaration { 962 $$ = lnklst($1, $3); 963 } 964 ; 965 966 struct_declaration: /* C99 6.7.2.1 */ 967 begin_type_noclass_declmods end_type { 968 /* too late, i know, but getsym() compensates it */ 969 symtyp = FMEMBER; 970 } notype_member_decls type_attribute_opt { 971 symtyp = FVFT; 972 $$ = $4; 973 } 974 | begin_type_noclass_declspecs end_type { 975 symtyp = FMEMBER; 976 } type_member_decls type_attribute_opt { 977 symtyp = FVFT; 978 $$ = $4; 979 } 980 | begin_type_noclass_declmods end_type type_attribute_opt { 981 /* syntax error '%s' */ 982 error(249, "member without type"); 983 $$ = NULL; 984 } 985 | begin_type_noclass_declspecs end_type type_attribute_opt { 986 symtyp = FVFT; 987 if (!Sflag) 988 /* anonymous struct/union members is a C9X feature */ 989 warning(49); 990 if (is_struct_or_union(dcs->d_type->t_tspec)) { 991 $$ = dcs->d_type->t_str->sou_first_member; 992 /* add all the members of the anonymous struct/union */ 993 anonymize($$); 994 } else { 995 /* syntax error '%s' */ 996 error(249, "unnamed member"); 997 $$ = NULL; 998 } 999 } 1000 | error { 1001 symtyp = FVFT; 1002 $$ = NULL; 1003 } 1004 ; 1005 1006 /* TODO: rename 'decls' to 'declarators', everywhere. */ 1007 notype_member_decls: 1008 notype_member_decl { 1009 $$ = declarator_1_struct_union($1); 1010 } 1011 | notype_member_decls { 1012 symtyp = FMEMBER; 1013 } T_COMMA type_member_decl { 1014 $$ = lnklst($1, declarator_1_struct_union($4)); 1015 } 1016 ; 1017 1018 type_member_decls: 1019 type_member_decl { 1020 $$ = declarator_1_struct_union($1); 1021 } 1022 | type_member_decls { 1023 symtyp = FMEMBER; 1024 } T_COMMA type_member_decl { 1025 $$ = lnklst($1, declarator_1_struct_union($4)); 1026 } 1027 ; 1028 1029 notype_member_decl: 1030 notype_decl 1031 | notype_decl T_COLON constant_expr { /* C99 6.7.2.1 */ 1032 $$ = bitfield($1, to_int_constant($3, true)); 1033 } 1034 | { 1035 symtyp = FVFT; 1036 } T_COLON constant_expr { /* C99 6.7.2.1 */ 1037 $$ = bitfield(NULL, to_int_constant($3, true)); 1038 } 1039 ; 1040 1041 type_member_decl: 1042 type_decl 1043 | type_decl T_COLON constant_expr { 1044 $$ = bitfield($1, to_int_constant($3, true)); 1045 } 1046 | { 1047 symtyp = FVFT; 1048 } T_COLON constant_expr { 1049 $$ = bitfield(NULL, to_int_constant($3, true)); 1050 } 1051 ; 1052 1053 enum_specifier: /* C99 6.7.2.2 */ 1054 enum identifier_sym { 1055 $$ = mktag($2, ENUM, false, false); 1056 } 1057 | enum identifier_sym { 1058 dcs->d_tagtyp = mktag($2, ENUM, true, false); 1059 } enum_declaration { 1060 $$ = complete_tag_enum(dcs->d_tagtyp, $4); 1061 } 1062 | enum { 1063 dcs->d_tagtyp = mktag(NULL, ENUM, true, false); 1064 } enum_declaration { 1065 $$ = complete_tag_enum(dcs->d_tagtyp, $3); 1066 } 1067 | enum error { 1068 symtyp = FVFT; 1069 $$ = gettyp(INT); 1070 } 1071 ; 1072 1073 enum: /* helper for C99 6.7.2.2 */ 1074 T_ENUM { 1075 symtyp = FTAG; 1076 begin_declaration_level(CTCONST); 1077 } 1078 ; 1079 1080 enum_declaration: /* helper for C99 6.7.2.2 */ 1081 enum_decl_lbrace enums_with_opt_comma T_RBRACE { 1082 $$ = $2; 1083 } 1084 ; 1085 1086 enum_decl_lbrace: /* helper for C99 6.7.2.2 */ 1087 T_LBRACE { 1088 symtyp = FVFT; 1089 enumval = 0; 1090 } 1091 ; 1092 1093 enums_with_opt_comma: /* helper for C99 6.7.2.2 */ 1094 enumerator_list 1095 | enumerator_list T_COMMA { 1096 if (sflag) { 1097 /* trailing ',' prohibited in enum declaration */ 1098 error(54); 1099 } else { 1100 /* trailing ',' prohibited in enum declaration */ 1101 c99ism(54); 1102 } 1103 $$ = $1; 1104 } 1105 ; 1106 1107 enumerator_list: /* C99 6.7.2.2 */ 1108 enumerator 1109 | enumerator_list T_COMMA enumerator { 1110 $$ = lnklst($1, $3); 1111 } 1112 | error { 1113 $$ = NULL; 1114 } 1115 ; 1116 1117 enumerator: /* C99 6.7.2.2 */ 1118 identifier_sym { 1119 $$ = enumeration_constant($1, enumval, true); 1120 } 1121 | identifier_sym T_ASSIGN constant_expr { 1122 $$ = enumeration_constant($1, to_int_constant($3, true), false); 1123 } 1124 ; 1125 1126 type_qualifier: /* C99 6.7.3 */ 1127 T_QUAL { 1128 $$ = xcalloc(1, sizeof(*$$)); 1129 if ($1 == CONST) { 1130 $$->p_const = true; 1131 } else if ($1 == VOLATILE) { 1132 $$->p_volatile = true; 1133 } else { 1134 lint_assert($1 == RESTRICT || $1 == THREAD); 1135 } 1136 } 1137 ; 1138 1139 pointer: /* C99 6.7.5 */ 1140 asterisk type_qualifier_list_opt { 1141 $$ = merge_qualified_pointer($1, $2); 1142 } 1143 | asterisk type_qualifier_list_opt pointer { 1144 $$ = merge_qualified_pointer($1, $2); 1145 $$ = merge_qualified_pointer($$, $3); 1146 } 1147 ; 1148 1149 asterisk: /* helper for 'pointer' */ 1150 T_ASTERISK { 1151 $$ = xcalloc(1, sizeof(*$$)); 1152 $$->p_pointer = true; 1153 } 1154 ; 1155 1156 type_qualifier_list_opt: /* see C99 6.7.5 */ 1157 /* empty */ { 1158 $$ = NULL; 1159 } 1160 | type_qualifier_list 1161 ; 1162 1163 type_qualifier_list: /* C99 6.7.5 */ 1164 type_qualifier 1165 | type_qualifier_list type_qualifier { 1166 $$ = merge_qualified_pointer($1, $2); 1167 } 1168 ; 1169 1170 /* 1171 * For an explanation of 'notype' in the following rules, see the Bison 1172 * manual, section 7.1 "Semantic Info in Token Kinds". 1173 */ 1174 1175 notype_init_decls: 1176 notype_init_decl 1177 | notype_init_decls T_COMMA type_init_decl 1178 ; 1179 1180 type_init_decls: 1181 type_init_decl 1182 | type_init_decls T_COMMA type_init_decl 1183 ; 1184 1185 notype_init_decl: 1186 notype_decl asm_or_symbolrename_opt { 1187 cgram_declare($1, false, $2); 1188 check_size($1); 1189 } 1190 | notype_decl asm_or_symbolrename_opt { 1191 begin_initialization($1); 1192 cgram_declare($1, true, $2); 1193 } T_ASSIGN initializer { 1194 check_size($1); 1195 end_initialization(); 1196 } 1197 ; 1198 1199 type_init_decl: 1200 type_decl asm_or_symbolrename_opt { 1201 cgram_declare($1, false, $2); 1202 check_size($1); 1203 } 1204 | type_decl asm_or_symbolrename_opt { 1205 begin_initialization($1); 1206 cgram_declare($1, true, $2); 1207 } T_ASSIGN initializer { 1208 check_size($1); 1209 end_initialization(); 1210 } 1211 ; 1212 1213 notype_decl: 1214 notype_direct_decl 1215 | pointer notype_direct_decl { 1216 $$ = add_pointer($2, $1); 1217 } 1218 ; 1219 1220 type_decl: 1221 type_direct_decl 1222 | pointer type_direct_decl { 1223 $$ = add_pointer($2, $1); 1224 } 1225 ; 1226 1227 notype_direct_decl: 1228 T_NAME { 1229 $$ = declarator_name(getsym($1)); 1230 } 1231 | T_LPAREN type_decl T_RPAREN { 1232 $$ = $2; 1233 } 1234 | type_attribute notype_direct_decl { 1235 $$ = $2; 1236 } 1237 | notype_direct_decl T_LBRACK T_RBRACK { 1238 $$ = add_array($1, false, 0); 1239 } 1240 | notype_direct_decl T_LBRACK array_size T_RBRACK { 1241 $$ = add_array($1, true, to_int_constant($3, false)); 1242 } 1243 | notype_direct_decl param_list asm_or_symbolrename_opt { 1244 $$ = add_function(symbolrename($1, $3), $2); 1245 end_declaration_level(); 1246 block_level--; 1247 } 1248 | notype_direct_decl type_attribute 1249 ; 1250 1251 type_direct_decl: 1252 identifier { 1253 $$ = declarator_name(getsym($1)); 1254 } 1255 | T_LPAREN type_decl T_RPAREN { 1256 $$ = $2; 1257 } 1258 | type_attribute type_direct_decl { 1259 $$ = $2; 1260 } 1261 | type_direct_decl T_LBRACK T_RBRACK { 1262 $$ = add_array($1, false, 0); 1263 } 1264 | type_direct_decl T_LBRACK array_size T_RBRACK { 1265 $$ = add_array($1, true, to_int_constant($3, false)); 1266 } 1267 | type_direct_decl param_list asm_or_symbolrename_opt { 1268 $$ = add_function(symbolrename($1, $3), $2); 1269 end_declaration_level(); 1270 block_level--; 1271 } 1272 | type_direct_decl type_attribute 1273 ; 1274 1275 /* 1276 * The two distinct rules type_param_decl and notype_param_decl avoid a 1277 * conflict in argument lists. A typename enclosed in parentheses is always 1278 * treated as a typename, not an argument name. For example, after 1279 * "typedef double a;", the declaration "f(int (a));" is interpreted as 1280 * "f(int (double));", not "f(int a);". 1281 */ 1282 type_param_decl: 1283 direct_param_decl 1284 | pointer direct_param_decl { 1285 $$ = add_pointer($2, $1); 1286 } 1287 ; 1288 1289 notype_param_decl: 1290 direct_notype_param_decl 1291 | pointer direct_notype_param_decl { 1292 $$ = add_pointer($2, $1); 1293 } 1294 ; 1295 1296 direct_param_decl: 1297 identifier type_attribute_list { 1298 $$ = declarator_name(getsym($1)); 1299 } 1300 | identifier { 1301 $$ = declarator_name(getsym($1)); 1302 } 1303 | T_LPAREN notype_param_decl T_RPAREN { 1304 $$ = $2; 1305 } 1306 | direct_param_decl T_LBRACK T_RBRACK { 1307 $$ = add_array($1, false, 0); 1308 } 1309 | direct_param_decl T_LBRACK array_size T_RBRACK { 1310 $$ = add_array($1, true, to_int_constant($3, false)); 1311 } 1312 | direct_param_decl param_list asm_or_symbolrename_opt { 1313 $$ = add_function(symbolrename($1, $3), $2); 1314 end_declaration_level(); 1315 block_level--; 1316 } 1317 ; 1318 1319 direct_notype_param_decl: 1320 identifier { 1321 $$ = declarator_name(getsym($1)); 1322 } 1323 | T_LPAREN notype_param_decl T_RPAREN { 1324 $$ = $2; 1325 } 1326 | direct_notype_param_decl T_LBRACK T_RBRACK { 1327 $$ = add_array($1, false, 0); 1328 } 1329 | direct_notype_param_decl T_LBRACK array_size T_RBRACK { 1330 $$ = add_array($1, true, to_int_constant($3, false)); 1331 } 1332 | direct_notype_param_decl param_list asm_or_symbolrename_opt { 1333 $$ = add_function(symbolrename($1, $3), $2); 1334 end_declaration_level(); 1335 block_level--; 1336 } 1337 ; 1338 1339 param_list: 1340 id_list_lparen identifier_list T_RPAREN { 1341 $$ = $2; 1342 } 1343 | abstract_decl_param_list 1344 ; 1345 1346 id_list_lparen: 1347 T_LPAREN { 1348 block_level++; 1349 begin_declaration_level(PROTO_ARG); 1350 } 1351 ; 1352 1353 array_size: 1354 type_qualifier_list_opt T_SCLASS constant_expr { 1355 /* C11 6.7.6.3p7 */ 1356 if ($2 != STATIC) 1357 yyerror("Bad attribute"); 1358 /* static array size is a C11 extension */ 1359 c11ism(343); 1360 $$ = $3; 1361 } 1362 | constant_expr 1363 ; 1364 1365 identifier_list: /* C99 6.7.5 */ 1366 T_NAME { 1367 $$ = old_style_function_name(getsym($1)); 1368 } 1369 | identifier_list T_COMMA T_NAME { 1370 $$ = lnklst($1, old_style_function_name(getsym($3))); 1371 } 1372 | identifier_list error 1373 ; 1374 1375 /* XXX: C99 requires an additional specifier-qualifier-list. */ 1376 type_name: /* C99 6.7.6 */ 1377 { 1378 begin_declaration_level(ABSTRACT); 1379 } abstract_declaration { 1380 end_declaration_level(); 1381 $$ = $2->s_type; 1382 } 1383 ; 1384 1385 abstract_declaration: 1386 begin_type_noclass_declmods end_type { 1387 $$ = declare_1_abstract(abstract_name()); 1388 } 1389 | begin_type_noclass_declspecs end_type { 1390 $$ = declare_1_abstract(abstract_name()); 1391 } 1392 | begin_type_noclass_declmods end_type abstract_declarator { 1393 $$ = declare_1_abstract($3); 1394 } 1395 | begin_type_noclass_declspecs end_type abstract_declarator { 1396 $$ = declare_1_abstract($3); 1397 } 1398 ; 1399 1400 abstract_declarator: /* C99 6.7.6 */ 1401 pointer { 1402 $$ = add_pointer(abstract_name(), $1); 1403 } 1404 | direct_abstract_declarator 1405 | pointer direct_abstract_declarator { 1406 $$ = add_pointer($2, $1); 1407 } 1408 | T_TYPEOF cast_expression { /* GCC extension */ 1409 $$ = mktempsym($2->tn_type); 1410 } 1411 ; 1412 1413 direct_abstract_declarator: /* C99 6.7.6 */ 1414 T_LPAREN abstract_declarator T_RPAREN { 1415 $$ = $2; 1416 } 1417 | T_LBRACK T_RBRACK { 1418 $$ = add_array(abstract_name(), false, 0); 1419 } 1420 | T_LBRACK array_size T_RBRACK { 1421 $$ = add_array(abstract_name(), true, to_int_constant($2, false)); 1422 } 1423 | type_attribute direct_abstract_declarator { 1424 $$ = $2; 1425 } 1426 | direct_abstract_declarator T_LBRACK T_RBRACK { 1427 $$ = add_array($1, false, 0); 1428 } 1429 | direct_abstract_declarator T_LBRACK T_ASTERISK T_RBRACK { /* C99 */ 1430 $$ = add_array($1, false, 0); 1431 } 1432 | direct_abstract_declarator T_LBRACK array_size T_RBRACK { 1433 $$ = add_array($1, true, to_int_constant($3, false)); 1434 } 1435 | abstract_decl_param_list asm_or_symbolrename_opt { 1436 $$ = add_function(symbolrename(abstract_name(), $2), $1); 1437 end_declaration_level(); 1438 block_level--; 1439 } 1440 | direct_abstract_declarator abstract_decl_param_list asm_or_symbolrename_opt { 1441 $$ = add_function(symbolrename($1, $3), $2); 1442 end_declaration_level(); 1443 block_level--; 1444 } 1445 | direct_abstract_declarator type_attribute_list 1446 ; 1447 1448 abstract_decl_param_list: 1449 abstract_decl_lparen T_RPAREN type_attribute_opt { 1450 $$ = NULL; 1451 } 1452 | abstract_decl_lparen vararg_parameter_type_list T_RPAREN type_attribute_opt { 1453 dcs->d_proto = true; 1454 $$ = $2; 1455 } 1456 | abstract_decl_lparen error T_RPAREN type_attribute_opt { 1457 $$ = NULL; 1458 } 1459 ; 1460 1461 abstract_decl_lparen: 1462 T_LPAREN { 1463 block_level++; 1464 begin_declaration_level(PROTO_ARG); 1465 } 1466 ; 1467 1468 vararg_parameter_type_list: 1469 parameter_type_list 1470 | parameter_type_list T_COMMA T_ELLIPSIS { 1471 dcs->d_vararg = true; 1472 $$ = $1; 1473 } 1474 | T_ELLIPSIS { 1475 if (sflag) { 1476 /* ANSI C requires formal parameter before '...' */ 1477 error(84); 1478 } else if (!tflag) { 1479 /* ANSI C requires formal parameter before '...' */ 1480 warning(84); 1481 } 1482 dcs->d_vararg = true; 1483 $$ = NULL; 1484 } 1485 ; 1486 1487 /* XXX: C99 6.7.5 defines the same name, but it looks different. */ 1488 parameter_type_list: 1489 parameter_declaration 1490 | parameter_type_list T_COMMA parameter_declaration { 1491 $$ = lnklst($1, $3); 1492 } 1493 ; 1494 1495 /* XXX: C99 6.7.5 defines the same name, but it looks completely different. */ 1496 parameter_declaration: 1497 begin_type_declmods end_type { 1498 $$ = declare_argument(abstract_name(), false); 1499 } 1500 | begin_type_declaration_specifiers end_type { 1501 $$ = declare_argument(abstract_name(), false); 1502 } 1503 | begin_type_declmods end_type notype_param_decl { 1504 $$ = declare_argument($3, false); 1505 } 1506 /* 1507 * type_param_decl is needed because of following conflict: 1508 * "typedef int a; f(int (a));" could be parsed as 1509 * "function with argument a of type int", or 1510 * "function with an abstract argument of type function". 1511 * This grammar realizes the second case. 1512 */ 1513 | begin_type_declaration_specifiers end_type type_param_decl { 1514 $$ = declare_argument($3, false); 1515 } 1516 | begin_type_declmods end_type abstract_declarator { 1517 $$ = declare_argument($3, false); 1518 } 1519 | begin_type_declaration_specifiers end_type abstract_declarator { 1520 $$ = declare_argument($3, false); 1521 } 1522 ; 1523 1524 initializer: /* C99 6.7.8 "Initialization" */ 1525 expr %prec T_COMMA { 1526 init_expr($1); 1527 } 1528 | init_lbrace init_rbrace { 1529 /* XXX: Empty braces are not covered by C99 6.7.8. */ 1530 } 1531 | init_lbrace initializer_list comma_opt init_rbrace 1532 | error 1533 ; 1534 1535 initializer_list: /* C99 6.7.8 "Initialization" */ 1536 initializer_list_item 1537 | initializer_list T_COMMA initializer_list_item 1538 ; 1539 1540 initializer_list_item: /* helper */ 1541 designation initializer 1542 | initializer 1543 ; 1544 1545 designation: /* C99 6.7.8 "Initialization" */ 1546 designator_list T_ASSIGN 1547 | identifier T_COLON { 1548 /* GCC style struct or union member name in initializer */ 1549 gnuism(315); 1550 add_designator_member($1); 1551 } 1552 ; 1553 1554 designator_list: /* C99 6.7.8 "Initialization" */ 1555 designator 1556 | designator_list designator 1557 ; 1558 1559 designator: /* C99 6.7.8 "Initialization" */ 1560 T_LBRACK range T_RBRACK { 1561 add_designator_subscript($2); 1562 if (!Sflag) 1563 /* array initializer with des.s is a C9X feature */ 1564 warning(321); 1565 } 1566 | T_POINT identifier { 1567 if (!Sflag) 1568 /* struct or union member name in initializer is ... */ 1569 warning(313); 1570 add_designator_member($2); 1571 } 1572 ; 1573 1574 range: 1575 constant_expr { 1576 $$.lo = to_int_constant($1, true); 1577 $$.hi = $$.lo; 1578 } 1579 | constant_expr T_ELLIPSIS constant_expr { 1580 $$.lo = to_int_constant($1, true); 1581 $$.hi = to_int_constant($3, true); 1582 /* initialization with '[a...b]' is a GCC extension */ 1583 gnuism(340); 1584 } 1585 ; 1586 1587 init_lbrace: /* helper */ 1588 T_LBRACE { 1589 init_lbrace(); 1590 } 1591 ; 1592 1593 init_rbrace: /* helper */ 1594 T_RBRACE { 1595 init_rbrace(); 1596 } 1597 ; 1598 1599 asm_or_symbolrename_opt: /* GCC extensions */ 1600 /* empty */ { 1601 $$ = NULL; 1602 } 1603 | T_ASM T_LPAREN T_STRING T_RPAREN { 1604 freeyyv(&$3, T_STRING); 1605 $$ = NULL; 1606 } 1607 | T_SYMBOLRENAME T_LPAREN T_NAME T_RPAREN { 1608 $$ = $3; 1609 } 1610 ; 1611 1612 statement: /* C99 6.8 */ 1613 expression_statement 1614 | non_expr_statement 1615 ; 1616 1617 non_expr_statement: /* helper for C99 6.8 */ 1618 type_attribute T_SEMI 1619 | labeled_statement 1620 | compound_statement 1621 | selection_statement 1622 | iteration_statement 1623 | jump_statement { 1624 seen_fallthrough = false; 1625 } 1626 | asm_statement 1627 ; 1628 1629 labeled_statement: /* C99 6.8.1 */ 1630 label type_attribute_opt statement 1631 ; 1632 1633 label: 1634 T_NAME T_COLON { 1635 symtyp = FLABEL; 1636 named_label(getsym($1)); 1637 } 1638 | T_CASE constant_expr T_COLON { 1639 case_label($2); 1640 seen_fallthrough = true; 1641 } 1642 | T_CASE constant_expr T_ELLIPSIS constant_expr T_COLON { 1643 /* XXX: We don't fill all cases */ 1644 case_label($2); 1645 seen_fallthrough = true; 1646 } 1647 | T_DEFAULT T_COLON { 1648 default_label(); 1649 seen_fallthrough = true; 1650 } 1651 ; 1652 1653 compound_statement: /* C99 6.8.2 */ 1654 compound_statement_lbrace compound_statement_rbrace 1655 | compound_statement_lbrace block_item_list compound_statement_rbrace 1656 ; 1657 1658 compound_statement_lbrace: 1659 T_LBRACE { 1660 block_level++; 1661 mem_block_level++; 1662 begin_declaration_level(AUTO); 1663 } 1664 ; 1665 1666 compound_statement_rbrace: 1667 T_RBRACE { 1668 end_declaration_level(); 1669 freeblk(); 1670 mem_block_level--; 1671 block_level--; 1672 seen_fallthrough = false; 1673 } 1674 ; 1675 1676 block_item_list: /* C99 6.8.2 */ 1677 block_item 1678 | block_item_list block_item { 1679 if (!Sflag && $1 && !$2) 1680 /* declarations after statements is a C99 feature */ 1681 c99ism(327); 1682 $$ = $1 || $2; 1683 } 1684 ; 1685 1686 block_item: /* C99 6.8.2 */ 1687 declaration { 1688 $$ = false; 1689 restore_warning_flags(); 1690 } 1691 | statement { 1692 $$ = true; 1693 restore_warning_flags(); 1694 } 1695 ; 1696 1697 expression_statement: /* C99 6.8.3 */ 1698 expr T_SEMI { 1699 expr($1, false, false, false, false); 1700 seen_fallthrough = false; 1701 } 1702 | T_SEMI { 1703 seen_fallthrough = false; 1704 } 1705 ; 1706 1707 selection_statement: /* C99 6.8.4 */ 1708 if_without_else %prec T_THEN { 1709 save_warning_flags(); 1710 if2(); 1711 if3(false); 1712 } 1713 | if_without_else T_ELSE { 1714 save_warning_flags(); 1715 if2(); 1716 } statement { 1717 clear_warning_flags(); 1718 if3(true); 1719 } 1720 | if_without_else T_ELSE error { 1721 clear_warning_flags(); 1722 if3(false); 1723 } 1724 | switch_expr statement { 1725 clear_warning_flags(); 1726 switch2(); 1727 } 1728 | switch_expr error { 1729 clear_warning_flags(); 1730 switch2(); 1731 } 1732 ; 1733 1734 if_without_else: /* see C99 6.8.4 */ 1735 if_expr statement 1736 | if_expr error 1737 ; 1738 1739 if_expr: /* see C99 6.8.4 */ 1740 T_IF T_LPAREN expr T_RPAREN { 1741 if1($3); 1742 clear_warning_flags(); 1743 } 1744 ; 1745 1746 switch_expr: /* see C99 6.8.4 */ 1747 T_SWITCH T_LPAREN expr T_RPAREN { 1748 switch1($3); 1749 clear_warning_flags(); 1750 } 1751 ; 1752 1753 iteration_statement: /* C99 6.8.5 */ 1754 while_expr statement { 1755 clear_warning_flags(); 1756 while2(); 1757 } 1758 | while_expr error { 1759 clear_warning_flags(); 1760 while2(); 1761 } 1762 | do_statement do_while_expr { 1763 do2($2); 1764 seen_fallthrough = false; 1765 } 1766 | do error { 1767 clear_warning_flags(); 1768 do2(NULL); 1769 } 1770 | for_exprs statement { 1771 clear_warning_flags(); 1772 for2(); 1773 end_declaration_level(); 1774 block_level--; 1775 } 1776 | for_exprs error { 1777 clear_warning_flags(); 1778 for2(); 1779 end_declaration_level(); 1780 block_level--; 1781 } 1782 ; 1783 1784 while_expr: /* see C99 6.8.5 */ 1785 T_WHILE T_LPAREN expr T_RPAREN { 1786 while1($3); 1787 clear_warning_flags(); 1788 } 1789 ; 1790 1791 do_statement: /* see C99 6.8.5 */ 1792 do statement { 1793 clear_warning_flags(); 1794 } 1795 ; 1796 1797 do: /* see C99 6.8.5 */ 1798 T_DO { 1799 do1(); 1800 } 1801 ; 1802 1803 do_while_expr: /* see C99 6.8.5 */ 1804 T_WHILE T_LPAREN expr T_RPAREN T_SEMI { 1805 $$ = $3; 1806 } 1807 ; 1808 1809 for_start: /* see C99 6.8.5 */ 1810 T_FOR T_LPAREN { 1811 begin_declaration_level(AUTO); 1812 block_level++; 1813 } 1814 ; 1815 1816 for_exprs: /* see C99 6.8.5 */ 1817 for_start begin_type_declaration_specifiers end_type notype_init_decls T_SEMI 1818 expr_opt T_SEMI expr_opt T_RPAREN { 1819 /* variable declaration in for loop */ 1820 c99ism(325); 1821 for1(NULL, $6, $8); 1822 clear_warning_flags(); 1823 } 1824 | for_start expr_opt T_SEMI expr_opt T_SEMI expr_opt T_RPAREN { 1825 for1($2, $4, $6); 1826 clear_warning_flags(); 1827 } 1828 ; 1829 1830 jump_statement: /* C99 6.8.6 */ 1831 goto identifier T_SEMI { 1832 do_goto(getsym($2)); 1833 } 1834 | goto error T_SEMI { 1835 symtyp = FVFT; 1836 } 1837 | T_CONTINUE T_SEMI { 1838 do_continue(); 1839 } 1840 | T_BREAK T_SEMI { 1841 do_break(); 1842 } 1843 | T_RETURN T_SEMI { 1844 do_return(NULL); 1845 } 1846 | T_RETURN expr T_SEMI { 1847 do_return($2); 1848 } 1849 ; 1850 1851 goto: /* see C99 6.8.6 */ 1852 T_GOTO { 1853 symtyp = FLABEL; 1854 } 1855 ; 1856 1857 asm_statement: /* GCC extension */ 1858 T_ASM T_LPAREN read_until_rparen T_SEMI { 1859 setasm(); 1860 } 1861 | T_ASM T_QUAL T_LPAREN read_until_rparen T_SEMI { 1862 setasm(); 1863 } 1864 | T_ASM error 1865 ; 1866 1867 read_until_rparen: /* helper for 'asm_statement' */ 1868 /* empty */ { 1869 ignore_up_to_rparen(); 1870 } 1871 ; 1872 1873 translation_unit: /* C99 6.9 */ 1874 external_declaration 1875 | translation_unit external_declaration 1876 ; 1877 1878 external_declaration: /* C99 6.9 */ 1879 asm_statement 1880 | function_definition { 1881 global_clean_up_decl(false); 1882 clear_warning_flags(); 1883 } 1884 | top_level_declaration { 1885 global_clean_up_decl(false); 1886 clear_warning_flags(); 1887 } 1888 ; 1889 1890 /* 1891 * On the top level, lint allows several forms of declarations that it doesn't 1892 * allow in functions. For example, a single ';' is an empty declaration and 1893 * is supported by some compilers, but in a function it would be an empty 1894 * statement, not a declaration. This makes a difference in C90 mode, where 1895 * a statement must not be followed by a declaration. 1896 * 1897 * See 'declaration' for all other declarations. 1898 */ 1899 top_level_declaration: /* C99 6.9 calls this 'declaration' */ 1900 T_SEMI { 1901 if (sflag) { 1902 /* empty declaration */ 1903 error(0); 1904 } else if (!tflag) { 1905 /* empty declaration */ 1906 warning(0); 1907 } 1908 } 1909 | begin_type end_type notype_init_decls T_SEMI { 1910 if (sflag) { 1911 /* old style declaration; add 'int' */ 1912 error(1); 1913 } else if (!tflag) { 1914 /* old style declaration; add 'int' */ 1915 warning(1); 1916 } 1917 } 1918 | begin_type_declmods end_type T_SEMI { 1919 if (dcs->d_scl == TYPEDEF) { 1920 /* typedef declares no type name */ 1921 warning(72); 1922 } else { 1923 /* empty declaration */ 1924 warning(2); 1925 } 1926 } 1927 | begin_type_declmods end_type notype_init_decls T_SEMI 1928 | begin_type_declaration_specifiers end_type T_SEMI { 1929 if (dcs->d_scl == TYPEDEF) { 1930 /* typedef declares no type name */ 1931 warning(72); 1932 } else if (!dcs->d_nonempty_decl) { 1933 /* empty declaration */ 1934 warning(2); 1935 } 1936 } 1937 | begin_type_declaration_specifiers end_type type_init_decls T_SEMI 1938 | error T_SEMI { 1939 global_clean_up(); 1940 } 1941 | error T_RBRACE { 1942 global_clean_up(); 1943 } 1944 ; 1945 1946 function_definition: /* C99 6.9.1 */ 1947 func_decl { 1948 if ($1->s_type->t_tspec != FUNC) { 1949 /* syntax error '%s' */ 1950 error(249, yytext); 1951 YYERROR; 1952 } 1953 if ($1->s_type->t_typedef) { 1954 /* ()-less function definition */ 1955 error(64); 1956 YYERROR; 1957 } 1958 funcdef($1); 1959 block_level++; 1960 begin_declaration_level(ARG); 1961 if (lwarn == LWARN_NONE) 1962 $1->s_used = true; 1963 } arg_declaration_list_opt { 1964 end_declaration_level(); 1965 block_level--; 1966 check_func_lint_directives(); 1967 check_func_old_style_arguments(); 1968 begin_control_statement(CS_FUNCTION_BODY); 1969 } compound_statement { 1970 funcend(); 1971 end_control_statement(CS_FUNCTION_BODY); 1972 } 1973 ; 1974 1975 func_decl: 1976 begin_type end_type notype_decl { 1977 $$ = $3; 1978 } 1979 | begin_type_declmods end_type notype_decl { 1980 $$ = $3; 1981 } 1982 | begin_type_declaration_specifiers end_type type_decl { 1983 $$ = $3; 1984 } 1985 ; 1986 1987 arg_declaration_list_opt: /* C99 6.9.1p13 example 1 */ 1988 /* empty */ 1989 | arg_declaration_list 1990 ; 1991 1992 arg_declaration_list: /* C99 6.9.1p13 example 1 */ 1993 arg_declaration 1994 | arg_declaration_list arg_declaration 1995 /* XXX or better "arg_declaration error" ? */ 1996 | error 1997 ; 1998 1999 /* 2000 * "arg_declaration" is separated from "declaration" because it 2001 * needs other error handling. 2002 */ 2003 arg_declaration: 2004 begin_type_declmods end_type T_SEMI { 2005 /* empty declaration */ 2006 warning(2); 2007 } 2008 | begin_type_declmods end_type notype_init_decls T_SEMI 2009 | begin_type_declaration_specifiers end_type T_SEMI { 2010 if (!dcs->d_nonempty_decl) { 2011 /* empty declaration */ 2012 warning(2); 2013 } else { 2014 /* '%s' declared in argument declaration list */ 2015 warning(3, type_name(dcs->d_type)); 2016 } 2017 } 2018 | begin_type_declaration_specifiers end_type type_init_decls T_SEMI { 2019 if (dcs->d_nonempty_decl) { 2020 /* '%s' declared in argument declaration list */ 2021 warning(3, type_name(dcs->d_type)); 2022 } 2023 } 2024 | begin_type_declmods error 2025 | begin_type_declaration_specifiers error 2026 ; 2027 2028 gcc_attribute_spec_list: 2029 gcc_attribute_spec 2030 | gcc_attribute_spec_list T_COMMA gcc_attribute_spec 2031 ; 2032 2033 gcc_attribute_spec: 2034 /* empty */ 2035 | T_AT_ALWAYS_INLINE 2036 | T_AT_ALIAS T_LPAREN string T_RPAREN 2037 | T_AT_ALIGNED T_LPAREN constant_expr T_RPAREN 2038 | T_AT_ALIGNED 2039 | T_AT_ALLOC_SIZE T_LPAREN constant_expr T_COMMA constant_expr T_RPAREN 2040 | T_AT_ALLOC_SIZE T_LPAREN constant_expr T_RPAREN 2041 | T_AT_BOUNDED T_LPAREN gcc_attribute_bounded 2042 T_COMMA constant_expr T_COMMA constant_expr T_RPAREN 2043 | T_AT_COLD 2044 | T_AT_COMMON 2045 | T_AT_CONSTRUCTOR T_LPAREN constant_expr T_RPAREN 2046 | T_AT_CONSTRUCTOR 2047 | T_AT_DEPRECATED T_LPAREN string T_RPAREN 2048 | T_AT_DEPRECATED 2049 | T_AT_DESTRUCTOR T_LPAREN constant_expr T_RPAREN 2050 | T_AT_DESTRUCTOR 2051 | T_AT_FALLTHROUGH { 2052 fallthru(1); 2053 } 2054 | T_AT_FORMAT T_LPAREN gcc_attribute_format T_COMMA 2055 constant_expr T_COMMA constant_expr T_RPAREN 2056 | T_AT_FORMAT_ARG T_LPAREN constant_expr T_RPAREN 2057 | T_AT_GNU_INLINE 2058 | T_AT_HOT 2059 | T_AT_MALLOC 2060 | T_AT_MAY_ALIAS 2061 | T_AT_MODE T_LPAREN T_NAME T_RPAREN 2062 | T_AT_NOINLINE 2063 | T_AT_NONNULL T_LPAREN constant_expr_list_opt T_RPAREN 2064 | T_AT_NONNULL 2065 | T_AT_NONSTRING 2066 | T_AT_NORETURN 2067 | T_AT_NOTHROW 2068 | T_AT_NO_INSTRUMENT_FUNCTION 2069 | T_AT_OPTIMIZE T_LPAREN string T_RPAREN 2070 | T_AT_PACKED { 2071 addpacked(); 2072 } 2073 | T_AT_PCS T_LPAREN string T_RPAREN 2074 | T_AT_PURE 2075 | T_AT_RETURNS_TWICE 2076 | T_AT_SECTION T_LPAREN string T_RPAREN 2077 | T_AT_SENTINEL T_LPAREN constant_expr T_RPAREN 2078 | T_AT_SENTINEL 2079 | T_AT_TLS_MODEL T_LPAREN string T_RPAREN 2080 | T_AT_TUNION 2081 | T_AT_UNUSED { 2082 add_attr_used(); 2083 } 2084 | T_AT_USED { 2085 add_attr_used(); 2086 } 2087 | T_AT_VISIBILITY T_LPAREN constant_expr T_RPAREN 2088 | T_AT_WARN_UNUSED_RESULT 2089 | T_AT_WEAK 2090 | T_QUAL { 2091 if ($1 != CONST) 2092 yyerror("Bad attribute"); 2093 } 2094 ; 2095 2096 gcc_attribute_bounded: 2097 T_AT_MINBYTES 2098 | T_AT_STRING 2099 | T_AT_BUFFER 2100 ; 2101 2102 gcc_attribute_format: 2103 T_AT_FORMAT_GNU_PRINTF 2104 | T_AT_FORMAT_PRINTF 2105 | T_AT_FORMAT_SCANF 2106 | T_AT_FORMAT_STRFMON 2107 | T_AT_FORMAT_STRFTIME 2108 | T_AT_FORMAT_SYSLOG 2109 ; 2110 2111 %% 2112 2113 /* ARGSUSED */ 2114 int 2115 yyerror(const char *msg) 2116 { 2117 /* syntax error '%s' */ 2118 error(249, yytext); 2119 if (++sytxerr >= 5) 2120 norecover(); 2121 return 0; 2122 } 2123 2124 static void 2125 cgram_declare(sym_t *decl, bool initflg, sbuf_t *renaming) 2126 { 2127 declare(decl, initflg, renaming); 2128 if (renaming != NULL) 2129 freeyyv(&renaming, T_NAME); 2130 } 2131 2132 /* 2133 * Discard all input tokens up to and including the next 2134 * unmatched right paren 2135 */ 2136 static void 2137 ignore_up_to_rparen(void) 2138 { 2139 int level; 2140 2141 if (yychar < 0) 2142 yychar = yylex(); 2143 freeyyv(&yylval, yychar); 2144 2145 level = 1; 2146 while (yychar != T_RPAREN || --level > 0) { 2147 if (yychar == T_LPAREN) { 2148 level++; 2149 } else if (yychar <= 0) { 2150 break; 2151 } 2152 freeyyv(&yylval, yychar = yylex()); 2153 } 2154 2155 yyclearin; 2156 } 2157 2158 static sym_t * 2159 symbolrename(sym_t *s, sbuf_t *sb) 2160 { 2161 if (sb != NULL) 2162 s->s_rename = sb->sb_name; 2163 return s; 2164 } 2165
Indexes created Thu Oct 02 10:09:58 GMT 2025