%{ /* $NetBSD: cgram.y,v 1.424 2022/10/01 09:42:40 rillig Exp $ */ /* * Copyright (c) 1996 Christopher G. Demetriou. All Rights Reserved. * Copyright (c) 1994, 1995 Jochen Pohl * All Rights Reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by Jochen Pohl for * The NetBSD Project. * 4. The name of the author may not be used to endorse or promote products * derived from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ #include #if defined(__RCSID) __RCSID("$NetBSD: cgram.y,v 1.424 2022/10/01 09:42:40 rillig Exp $"); #endif #include #include #include #include "lint1.h" extern char *yytext; /* * Contains the level of current declaration, used for symbol table entries. * 0 is the top-level, > 0 is inside a function body. */ int block_level; /* * level for memory allocation. Normally the same as block_level. * An exception is the declaration of arguments in prototypes. Memory * for these can't be freed after the declaration, but symbols must * be removed from the symbol table after the declaration. */ size_t mem_block_level; /* * Save the no-warns state and restore it to avoid the problem where * if (expr) { stmt } / * NOLINT * / stmt; */ #define LWARN_NOTHING_SAVED (-3) static int saved_lwarn = LWARN_NOTHING_SAVED; static void cgram_declare(sym_t *, bool, sbuf_t *); static void read_until_rparen(void); static sym_t *symbolrename(sym_t *, sbuf_t *); /* ARGSUSED */ static void clear_warning_flags_loc(const char *file, size_t line) { debug_step("%s:%zu: clearing flags", file, line); clear_warn_flags(); saved_lwarn = LWARN_NOTHING_SAVED; } /* ARGSUSED */ static void save_warning_flags_loc(const char *file, size_t line) { /* * There used to be an assertion that saved_lwarn is * LWARN_NOTHING_SAVED here, but that triggered for the following * code: * * void function(int x) { if (x > 0) if (x > 1) return; } * * It didn't trigger if the inner 'if' was enclosed in braces though. * * TODO: If actually needed, add support for nested suppression of * warnings. */ debug_step("%s:%zu: saving flags %d", file, line, lwarn); saved_lwarn = lwarn; } /* ARGSUSED */ static void restore_warning_flags_loc(const char *file, size_t line) { if (saved_lwarn != LWARN_NOTHING_SAVED) { lwarn = saved_lwarn; debug_step("%s:%zu: restoring flags %d", file, line, lwarn); /* * Do not set 'saved_lwarn = LWARN_NOTHING_SAVED' here, to * avoid triggering the assertion in save_warning_flags_loc. */ } else clear_warning_flags_loc(file, line); } #define clear_warning_flags() clear_warning_flags_loc(__FILE__, __LINE__) #define save_warning_flags() save_warning_flags_loc(__FILE__, __LINE__) #define restore_warning_flags() restore_warning_flags_loc(__FILE__, __LINE__) /* unbind the anonymous struct members from the struct */ static void anonymize(sym_t *s) { for ( ; s != NULL; s = s->s_next) s->u.s_member.sm_sou_type = NULL; } static bool is_either(const char *s, const char *a, const char *b) { return strcmp(s, a) == 0 || strcmp(s, b) == 0; } #if YYDEBUG && (YYBYACC || YYBISON) #define YYSTYPE_TOSTRING cgram_to_string #endif #if YYDEBUG && YYBISON #define YYPRINT cgram_print #endif %} %expect 129 %union { val_t *y_val; sbuf_t *y_name; sym_t *y_sym; op_t y_op; scl_t y_scl; tspec_t y_tspec; tqual_t y_tqual; type_t *y_type; tnode_t *y_tnode; range_t y_range; strg_t *y_string; qual_ptr *y_qual_ptr; bool y_seen_statement; struct generic_association *y_generic; struct array_size y_array_size; bool y_in_system_header; }; %token T_LBRACE T_RBRACE T_LBRACK T_RBRACK T_LPAREN T_RPAREN %token T_POINT T_ARROW %token T_COMPLEMENT T_LOGNOT %token T_INCDEC %token T_SIZEOF %token T_BUILTIN_OFFSETOF %token T_TYPEOF %token T_EXTENSION %token T_ALIGNAS %token T_ALIGNOF %token T_ASTERISK %token T_MULTIPLICATIVE %token T_ADDITIVE %token T_SHIFT %token T_RELATIONAL %token T_EQUALITY %token T_AMPER %token T_BITXOR %token T_BITOR %token T_LOGAND %token T_LOGOR %token T_QUEST %token T_COLON %token T_ASSIGN %token T_OPASSIGN %token T_COMMA %token T_SEMI %token T_ELLIPSIS %token T_REAL %token T_IMAG %token T_GENERIC %token T_NORETURN /* storage classes (extern, static, auto, register and typedef) */ %token T_SCLASS /* * predefined type keywords (char, int, short, long, unsigned, signed, * float, double, void); see T_TYPENAME for types from typedef */ %token T_TYPE /* qualifiers (const, volatile, restrict, _Thread_local) */ %token T_QUAL /* struct or union */ %token T_STRUCT_OR_UNION /* remaining keywords */ %token T_ASM %token T_BREAK %token T_CASE %token T_CONTINUE %token T_DEFAULT %token T_DO %token T_ELSE %token T_ENUM %token T_FOR %token T_GOTO %token T_IF %token T_PACKED %token T_RETURN %token T_SWITCH %token T_SYMBOLRENAME %token T_WHILE %token T_STATIC_ASSERT %token T_ATTRIBUTE %left T_THEN %left T_ELSE %right T_QUEST T_COLON %left T_LOGOR %left T_LOGAND %left T_BITOR %left T_BITXOR %left T_AMPER %left T_EQUALITY %left T_RELATIONAL %left T_SHIFT %left T_ADDITIVE %left T_ASTERISK T_MULTIPLICATIVE %token T_NAME %token T_TYPENAME %token T_CON %token T_STRING %type identifier_sym %type identifier %type string %type primary_expression %type generic_selection %type generic_assoc_list %type generic_association %type postfix_expression %type gcc_statement_expr_list %type gcc_statement_expr_item %type point_or_arrow %type argument_expression_list %type unary_expression %type cast_expression %type conditional_expression %type assignment_expression %type expression_opt %type expression %type constant_expr %type begin_type_typespec %type type_specifier %type notype_type_specifier %type struct_or_union_specifier %type struct_or_union %type braced_struct_declaration_list %type struct_declaration_list_with_rbrace %type struct_declaration_list %type struct_declaration %type notype_struct_declarators %type type_struct_declarators %type notype_struct_declarator %type type_struct_declarator %type enum_specifier %type enum_declaration %type enums_with_opt_comma %type enumerator_list %type enumerator %type type_qualifier %type pointer %type asterisk %type type_qualifier_list_opt %type type_qualifier_list %type notype_declarator %type type_declarator %type notype_direct_declarator %type type_direct_declarator %type type_param_declarator %type notype_param_declarator %type direct_param_declarator %type direct_notype_param_declarator %type param_list %type array_size_opt %type array_size %type identifier_list %type type_name %type abstract_declaration %type abstract_declarator %type direct_abstract_declarator %type abstract_decl_param_list %type vararg_parameter_type_list %type parameter_type_list %type parameter_declaration %type range %type asm_or_symbolrename_opt %type block_item_list %type block_item %type do_while_expr %type func_declarator %type sys %{ #if YYDEBUG && YYBISON static inline void cgram_print(FILE *, int, YYSTYPE); #endif %} %% program: /* empty */ { /* TODO: Make this an error in C99 mode as well. */ if (!allow_trad && !allow_c99) { /* empty translation unit */ error(272); } else if (allow_c90) { /* empty translation unit */ warning(272); } } | translation_unit ; identifier_sym: /* helper for struct/union/enum */ identifier { $$ = getsym($1); } ; /* K&R ???, C90 ???, C99 6.4.2.1, C11 ??? */ identifier: T_NAME { debug_step("cgram: name '%s'", $1->sb_name); $$ = $1; } | T_TYPENAME { debug_step("cgram: typename '%s'", $1->sb_name); $$ = $1; } ; /* see C99 6.4.5, string literals are joined by 5.1.1.2 */ string: T_STRING | string T_STRING { if (!allow_c90) { /* concatenated strings are illegal in traditional C */ warning(219); } $$ = cat_strings($1, $2); } ; /* K&R 7.1, C90 ???, C99 6.5.1, C11 6.5.1 */ primary_expression: T_NAME { bool sys_name, sys_next; sys_name = in_system_header; if (yychar < 0) yychar = yylex(); sys_next = in_system_header; in_system_header = sys_name; $$ = build_name(getsym($1), yychar == T_LPAREN); in_system_header = sys_next; } | T_CON { $$ = build_constant(gettyp($1->v_tspec), $1); } | string { $$ = build_string($1); } | T_LPAREN expression T_RPAREN { if ($2 != NULL) $2->tn_parenthesized = true; $$ = $2; } | generic_selection /* GCC primary-expression, see c_parser_postfix_expression */ | T_BUILTIN_OFFSETOF T_LPAREN type_name T_COMMA identifier T_RPAREN { symtyp = FMEMBER; $$ = build_offsetof($3, getsym($5)); } ; /* K&R ---, C90 ---, C99 ---, C11 6.5.1.1 */ generic_selection: T_GENERIC T_LPAREN assignment_expression T_COMMA generic_assoc_list T_RPAREN { /* generic selection requires C11 or later */ c11ism(345); $$ = build_generic_selection($3, $5); } ; /* K&R ---, C90 ---, C99 ---, C11 6.5.1.1 */ generic_assoc_list: generic_association | generic_assoc_list T_COMMA generic_association { $3->ga_prev = $1; $$ = $3; } ; /* K&R ---, C90 ---, C99 ---, C11 6.5.1.1 */ generic_association: type_name T_COLON assignment_expression { $$ = block_zero_alloc(sizeof(*$$)); $$->ga_arg = $1; $$->ga_result = $3; } | T_DEFAULT T_COLON assignment_expression { $$ = block_zero_alloc(sizeof(*$$)); $$->ga_arg = NULL; $$->ga_result = $3; } ; /* K&R 7.1, C90 ???, C99 6.5.2, C11 6.5.2 */ postfix_expression: primary_expression | postfix_expression T_LBRACK sys expression T_RBRACK { $$ = build_unary(INDIR, $3, build_binary($1, PLUS, $3, $4)); } | postfix_expression T_LPAREN sys T_RPAREN { $$ = build_function_call($1, $3, NULL); } | postfix_expression T_LPAREN sys argument_expression_list T_RPAREN { $$ = build_function_call($1, $3, $4); } | postfix_expression point_or_arrow sys T_NAME { $$ = build_member_access($1, $2, $3, $4); } | postfix_expression T_INCDEC sys { $$ = build_unary($2 == INC ? INCAFT : DECAFT, $3, $1); } | T_LPAREN type_name T_RPAREN { /* C99 6.5.2.5 "Compound literals" */ sym_t *tmp = mktempsym($2); begin_initialization(tmp); cgram_declare(tmp, true, NULL); } init_lbrace initializer_list comma_opt init_rbrace { if (!allow_c99) /* compound literals are a C99/GCC extension */ gnuism(319); $$ = build_name(*current_initsym(), false); end_initialization(); } | T_LPAREN compound_statement_lbrace { begin_statement_expr(); } gcc_statement_expr_list { do_statement_expr($4); } compound_statement_rbrace T_RPAREN { $$ = end_statement_expr(); } ; comma_opt: /* helper for 'postfix_expression' */ /* empty */ | T_COMMA ; /* * The inner part of a GCC statement-expression of the form ({ ... }). * * https://gcc.gnu.org/onlinedocs/gcc/Statement-Exprs.html */ gcc_statement_expr_list: gcc_statement_expr_item | gcc_statement_expr_list gcc_statement_expr_item { $$ = $2; } ; gcc_statement_expr_item: declaration_or_error { clear_warning_flags(); $$ = NULL; } | non_expr_statement { $$ = expr_alloc_tnode(); $$->tn_type = gettyp(VOID); } | expression T_SEMI { if ($1 == NULL) { /* in case of syntax errors */ $$ = expr_alloc_tnode(); $$->tn_type = gettyp(VOID); } else { /* XXX: do that only on the last name */ if ($1->tn_op == NAME) $1->tn_sym->s_used = true; expr($1, false, false, false, false); seen_fallthrough = false; $$ = $1; } } ; point_or_arrow: /* helper for 'postfix_expression' */ T_POINT { symtyp = FMEMBER; $$ = POINT; } | T_ARROW { symtyp = FMEMBER; $$ = ARROW; } ; /* K&R 7.1, C90 ???, C99 6.5.2, C11 6.5.2 */ argument_expression_list: assignment_expression { $$ = build_function_argument(NULL, $1); } | argument_expression_list T_COMMA assignment_expression { $$ = build_function_argument($1, $3); } ; /* K&R 7.2, C90 ???, C99 6.5.3, C11 6.5.3 */ unary_expression: postfix_expression | T_INCDEC sys unary_expression { $$ = build_unary($1 == INC ? INCBEF : DECBEF, $2, $3); } | T_AMPER sys cast_expression { $$ = build_unary(ADDR, $2, $3); } | T_ASTERISK sys cast_expression { $$ = build_unary(INDIR, $2, $3); } | T_ADDITIVE sys cast_expression { if (!allow_c90 && $1 == PLUS) { /* unary '+' is illegal in traditional C */ warning(100); } $$ = build_unary($1 == PLUS ? UPLUS : UMINUS, $2, $3); } | T_COMPLEMENT sys cast_expression { $$ = build_unary(COMPL, $2, $3); } | T_LOGNOT sys cast_expression { $$ = build_unary(NOT, $2, $3); } | T_REAL sys cast_expression { /* GCC c_parser_unary_expression */ $$ = build_unary(REAL, $2, $3); } | T_IMAG sys cast_expression { /* GCC c_parser_unary_expression */ $$ = build_unary(IMAG, $2, $3); } | T_EXTENSION cast_expression { /* GCC c_parser_unary_expression */ $$ = $2; } | T_SIZEOF unary_expression { $$ = $2 == NULL ? NULL : build_sizeof($2->tn_type); if ($$ != NULL) check_expr_misc($2, false, false, false, false, false, true); } | T_SIZEOF T_LPAREN type_name T_RPAREN { $$ = build_sizeof($3); } | T_ALIGNOF unary_expression { /* non type argument to alignof is a GCC extension */ gnuism(349); lint_assert($2 != NULL); $$ = build_alignof($2->tn_type); } /* K&R ---, C90 ---, C99 ---, C11 6.5.3 */ | T_ALIGNOF T_LPAREN type_name T_RPAREN { /* TODO: c11ism */ $$ = build_alignof($3); } ; /* The rule 'unary_operator' is inlined into unary_expression. */ /* K&R 7.2, C90 ???, C99 6.5.4, C11 6.5.4 */ cast_expression: unary_expression | T_LPAREN type_name T_RPAREN cast_expression { $$ = cast($4, $2); } ; expression_opt: /* empty */ { $$ = NULL; } | expression ; /* 'conditional_expression' also implements 'multiplicative_expression'. */ /* 'conditional_expression' also implements 'additive_expression'. */ /* 'conditional_expression' also implements 'shift_expression'. */ /* 'conditional_expression' also implements 'relational_expression'. */ /* 'conditional_expression' also implements 'equality_expression'. */ /* 'conditional_expression' also implements 'AND_expression'. */ /* 'conditional_expression' also implements 'exclusive_OR_expression'. */ /* 'conditional_expression' also implements 'inclusive_OR_expression'. */ /* 'conditional_expression' also implements 'logical_AND_expression'. */ /* 'conditional_expression' also implements 'logical_OR_expression'. */ /* K&R ???, C90 ???, C99 6.5.5 to 6.5.15, C11 6.5.5 to 6.5.15 */ conditional_expression: cast_expression | conditional_expression T_ASTERISK sys conditional_expression { $$ = build_binary($1, MULT, $3, $4); } | conditional_expression T_MULTIPLICATIVE sys conditional_expression { $$ = build_binary($1, $2, $3, $4); } | conditional_expression T_ADDITIVE sys conditional_expression { $$ = build_binary($1, $2, $3, $4); } | conditional_expression T_SHIFT sys conditional_expression { $$ = build_binary($1, $2, $3, $4); } | conditional_expression T_RELATIONAL sys conditional_expression { $$ = build_binary($1, $2, $3, $4); } | conditional_expression T_EQUALITY sys conditional_expression { $$ = build_binary($1, $2, $3, $4); } | conditional_expression T_AMPER sys conditional_expression { $$ = build_binary($1, BITAND, $3, $4); } | conditional_expression T_BITXOR sys conditional_expression { $$ = build_binary($1, BITXOR, $3, $4); } | conditional_expression T_BITOR sys conditional_expression { $$ = build_binary($1, BITOR, $3, $4); } | conditional_expression T_LOGAND sys conditional_expression { $$ = build_binary($1, LOGAND, $3, $4); } | conditional_expression T_LOGOR sys conditional_expression { $$ = build_binary($1, LOGOR, $3, $4); } | conditional_expression T_QUEST sys expression T_COLON sys conditional_expression { $$ = build_binary($1, QUEST, $3, build_binary($4, COLON, $6, $7)); } ; /* K&R ???, C90 ???, C99 6.5.16, C11 6.5.16 */ assignment_expression: conditional_expression | unary_expression T_ASSIGN sys assignment_expression { $$ = build_binary($1, ASSIGN, $3, $4); } | unary_expression T_OPASSIGN sys assignment_expression { $$ = build_binary($1, $2, $3, $4); } ; /* K&R ???, C90 ???, C99 6.5.17, C11 6.5.17 */ expression: assignment_expression | expression T_COMMA sys assignment_expression { $$ = build_binary($1, COMMA, $3, $4); } ; constant_expr: /* C99 6.6 */ conditional_expression ; declaration_or_error: declaration | error T_SEMI ; declaration: /* C99 6.7 */ begin_type_declmods end_type T_SEMI { if (dcs->d_scl == TYPEDEF) { /* typedef declares no type name */ warning(72); } else { /* empty declaration */ warning(2); } } | begin_type_declmods end_type notype_init_declarators T_SEMI { if (dcs->d_scl == TYPEDEF) { /* syntax error '%s' */ error(249, "missing base type for typedef"); } else { /* old-style declaration; add 'int' */ error(1); } } | begin_type_declaration_specifiers end_type T_SEMI { if (dcs->d_scl == TYPEDEF) { /* typedef declares no type name */ warning(72); } else if (!dcs->d_nonempty_decl) { /* empty declaration */ warning(2); } } | begin_type_declaration_specifiers end_type type_init_declarators T_SEMI | static_assert_declaration ; begin_type_declaration_specifiers: /* see C99 6.7 */ begin_type_typespec { dcs_add_type($1); } | begin_type_declmods type_specifier { dcs_add_type($2); } | type_attribute begin_type_declaration_specifiers | begin_type_declaration_specifiers declmod | begin_type_declaration_specifiers notype_type_specifier { dcs_add_type($2); } ; begin_type_declmods: /* see C99 6.7 */ begin_type T_QUAL { dcs_add_qualifier($2); } | begin_type T_SCLASS { dcs_add_storage_class($2); } | begin_type_declmods declmod ; begin_type_specifier_qualifier_list: /* see C11 6.7.2.1 */ begin_type_specifier_qualifier_list_postfix | type_attribute_list begin_type_specifier_qualifier_list_postfix ; begin_type_specifier_qualifier_list_postfix: begin_type_typespec { dcs_add_type($1); } | begin_type_qualifier_list type_specifier { dcs_add_type($2); } | begin_type_specifier_qualifier_list_postfix T_QUAL { dcs_add_qualifier($2); } | begin_type_specifier_qualifier_list_postfix notype_type_specifier { dcs_add_type($2); } | begin_type_specifier_qualifier_list_postfix type_attribute ; begin_type_typespec: begin_type notype_type_specifier { $$ = $2; } | begin_type T_TYPENAME { $$ = getsym($2)->s_type; } ; begin_type_qualifier_list: begin_type T_QUAL { dcs_add_qualifier($2); } | begin_type_qualifier_list T_QUAL { dcs_add_qualifier($2); } ; declmod: T_QUAL { dcs_add_qualifier($1); } | T_SCLASS { dcs_add_storage_class($1); } | type_attribute_list ; type_attribute_list_opt: /* empty */ | type_attribute_list ; type_attribute_list: type_attribute | type_attribute_list type_attribute ; type_attribute_opt: /* empty */ | type_attribute ; type_attribute: /* See C11 6.7 declaration-specifiers */ gcc_attribute_specifier | T_ALIGNAS T_LPAREN type_specifier T_RPAREN /* C11 6.7.5 */ | T_ALIGNAS T_LPAREN constant_expr T_RPAREN /* C11 6.7.5 */ | T_PACKED { dcs_add_packed(); } | T_NORETURN ; begin_type: /* empty */ { dcs_begin_type(); } ; end_type: /* empty */ { dcs_end_type(); } ; type_specifier: /* C99 6.7.2 */ notype_type_specifier | T_TYPENAME { $$ = getsym($1)->s_type; } ; notype_type_specifier: /* see C99 6.7.2 */ T_TYPE { $$ = gettyp($1); } | T_TYPEOF T_LPAREN expression T_RPAREN { /* GCC extension */ $$ = block_dup_type($3->tn_type); $$->t_typeof = true; } | struct_or_union_specifier { end_declaration_level(); $$ = $1; } | enum_specifier { end_declaration_level(); $$ = $1; } ; struct_or_union_specifier: /* C99 6.7.2.1 */ struct_or_union identifier_sym { /* * STDC requires that "struct a;" always introduces * a new tag if "a" is not declared at current level * * yychar is valid because otherwise the parser would not * have been able to decide if it must shift or reduce */ $$ = make_tag_type($2, $1, false, yychar == T_SEMI); } | struct_or_union identifier_sym { dcs->d_tagtyp = make_tag_type($2, $1, true, false); } braced_struct_declaration_list { $$ = complete_tag_struct_or_union(dcs->d_tagtyp, $4); } | struct_or_union { dcs->d_tagtyp = make_tag_type(NULL, $1, true, false); } braced_struct_declaration_list { $$ = complete_tag_struct_or_union(dcs->d_tagtyp, $3); } | struct_or_union error { symtyp = FVFT; $$ = gettyp(INT); } ; struct_or_union: /* C99 6.7.2.1 */ T_STRUCT_OR_UNION { symtyp = FTAG; begin_declaration_level($1 == STRUCT ? DK_MOS : DK_MOU); dcs->d_offset_in_bits = 0; dcs->d_sou_align_in_bits = CHAR_SIZE; $$ = $1; } | struct_or_union type_attribute ; braced_struct_declaration_list: /* see C99 6.7.2.1 */ struct_declaration_lbrace struct_declaration_list_with_rbrace { $$ = $2; } ; struct_declaration_lbrace: /* see C99 6.7.2.1 */ T_LBRACE { symtyp = FVFT; } ; struct_declaration_list_with_rbrace: /* see C99 6.7.2.1 */ struct_declaration_list T_RBRACE | T_RBRACE { /* XXX: This is not allowed by any C standard. */ $$ = NULL; } ; struct_declaration_list: /* C99 6.7.2.1 */ struct_declaration | struct_declaration_list struct_declaration { $$ = concat_lists($1, $2); } ; struct_declaration: /* C99 6.7.2.1 */ begin_type_qualifier_list end_type { /* ^^ There is no check for the missing type-specifier. */ /* too late, i know, but getsym() compensates it */ symtyp = FMEMBER; } notype_struct_declarators type_attribute_opt T_SEMI { symtyp = FVFT; $$ = $4; } | begin_type_specifier_qualifier_list end_type { symtyp = FMEMBER; } type_struct_declarators type_attribute_opt T_SEMI { symtyp = FVFT; $$ = $4; } | begin_type_qualifier_list end_type type_attribute_opt T_SEMI { /* syntax error '%s' */ error(249, "member without type"); $$ = NULL; } | begin_type_specifier_qualifier_list end_type type_attribute_opt T_SEMI { symtyp = FVFT; if (!allow_c11 && !allow_gcc) /* anonymous struct/union members is a C11 feature */ warning(49); if (is_struct_or_union(dcs->d_type->t_tspec)) { $$ = dcs->d_type->t_str->sou_first_member; /* add all the members of the anonymous struct/union */ anonymize($$); } else { /* syntax error '%s' */ error(249, "unnamed member"); $$ = NULL; } } | static_assert_declaration { $$ = NULL; } | error T_SEMI { symtyp = FVFT; $$ = NULL; } ; notype_struct_declarators: notype_struct_declarator { $$ = declarator_1_struct_union($1); } | notype_struct_declarators { symtyp = FMEMBER; } T_COMMA type_struct_declarator { $$ = concat_lists($1, declarator_1_struct_union($4)); } ; type_struct_declarators: type_struct_declarator { $$ = declarator_1_struct_union($1); } | type_struct_declarators { symtyp = FMEMBER; } T_COMMA type_struct_declarator { $$ = concat_lists($1, declarator_1_struct_union($4)); } ; notype_struct_declarator: notype_declarator | notype_declarator T_COLON constant_expr { /* C99 6.7.2.1 */ $$ = set_bit_field_width($1, to_int_constant($3, true)); } | { symtyp = FVFT; } T_COLON constant_expr { /* C99 6.7.2.1 */ $$ = set_bit_field_width(NULL, to_int_constant($3, true)); } ; type_struct_declarator: type_declarator | type_declarator T_COLON constant_expr { $$ = set_bit_field_width($1, to_int_constant($3, true)); } | { symtyp = FVFT; } T_COLON constant_expr { $$ = set_bit_field_width(NULL, to_int_constant($3, true)); } ; /* K&R ---, C90 6.5.2.2, C99 6.7.2.2, C11 6.7.2.2 */ enum_specifier: /* C99 6.7.2.2 */ enum gcc_attribute_specifier_list_opt identifier_sym { $$ = make_tag_type($3, ENUM, false, false); } | enum gcc_attribute_specifier_list_opt identifier_sym { dcs->d_tagtyp = make_tag_type($3, ENUM, true, false); } enum_declaration /*gcc_attribute_specifier_list_opt*/ { $$ = complete_tag_enum(dcs->d_tagtyp, $5); } | enum gcc_attribute_specifier_list_opt { dcs->d_tagtyp = make_tag_type(NULL, ENUM, true, false); } enum_declaration /*gcc_attribute_specifier_list_opt*/ { $$ = complete_tag_enum(dcs->d_tagtyp, $4); } | enum error { symtyp = FVFT; $$ = gettyp(INT); } ; enum: /* helper for C99 6.7.2.2 */ T_ENUM { symtyp = FTAG; begin_declaration_level(DK_ENUM_CONST); } ; enum_declaration: /* helper for C99 6.7.2.2 */ enum_decl_lbrace enums_with_opt_comma T_RBRACE { $$ = $2; } ; enum_decl_lbrace: /* helper for C99 6.7.2.2 */ T_LBRACE { symtyp = FVFT; enumval = 0; } ; enums_with_opt_comma: /* helper for C99 6.7.2.2 */ enumerator_list | enumerator_list T_COMMA { if (!allow_c99 && !allow_trad) { /* trailing ',' prohibited in enum declaration */ error(54); } else { /* trailing ',' prohibited in enum declaration */ c99ism(54); } $$ = $1; } ; enumerator_list: /* C99 6.7.2.2 */ enumerator | enumerator_list T_COMMA enumerator { $$ = concat_lists($1, $3); } | error { $$ = NULL; } ; enumerator: /* C99 6.7.2.2 */ identifier_sym gcc_attribute_specifier_list_opt { $$ = enumeration_constant($1, enumval, true); } | identifier_sym gcc_attribute_specifier_list_opt T_ASSIGN constant_expr { $$ = enumeration_constant($1, to_int_constant($4, true), false); } ; type_qualifier: /* C99 6.7.3 */ T_QUAL { $$ = xcalloc(1, sizeof(*$$)); if ($1 == CONST) $$->p_const = true; if ($1 == VOLATILE) $$->p_volatile = true; } ; pointer: /* C99 6.7.5 */ asterisk type_qualifier_list_opt { $$ = merge_qualified_pointer($1, $2); } | asterisk type_qualifier_list_opt pointer { $$ = merge_qualified_pointer($1, $2); $$ = merge_qualified_pointer($$, $3); } ; asterisk: /* helper for 'pointer' */ T_ASTERISK { $$ = xcalloc(1, sizeof(*$$)); $$->p_pointer = true; } ; type_qualifier_list_opt: /* see C99 6.7.5 */ /* empty */ { $$ = NULL; } | type_qualifier_list ; type_qualifier_list: /* C99 6.7.5 */ type_qualifier | type_qualifier_list type_qualifier { $$ = merge_qualified_pointer($1, $2); } ; /* * For an explanation of 'notype' in the following rules, see * https://www.gnu.org/software/bison/manual/bison.html#Semantic-Tokens. */ notype_init_declarators: notype_init_declarator | notype_init_declarators T_COMMA type_init_declarator ; type_init_declarators: type_init_declarator | type_init_declarators T_COMMA type_init_declarator ; notype_init_declarator: notype_declarator asm_or_symbolrename_opt { cgram_declare($1, false, $2); check_size($1); } | notype_declarator asm_or_symbolrename_opt { begin_initialization($1); cgram_declare($1, true, $2); } T_ASSIGN initializer { check_size($1); end_initialization(); } ; type_init_declarator: type_declarator asm_or_symbolrename_opt { cgram_declare($1, false, $2); check_size($1); } | type_declarator asm_or_symbolrename_opt { begin_initialization($1); cgram_declare($1, true, $2); } T_ASSIGN initializer { check_size($1); end_initialization(); } ; notype_declarator: notype_direct_declarator | pointer notype_direct_declarator { $$ = add_pointer($2, $1); } ; type_declarator: type_direct_declarator | pointer type_direct_declarator { $$ = add_pointer($2, $1); } ; notype_direct_declarator: type_attribute_list_opt T_NAME { $$ = declarator_name(getsym($2)); } | type_attribute_list_opt T_LPAREN type_declarator T_RPAREN { $$ = $3; } | notype_direct_declarator T_LBRACK array_size_opt T_RBRACK { $$ = add_array($1, $3.has_dim, $3.dim); } | notype_direct_declarator param_list asm_or_symbolrename_opt { $$ = add_function(symbolrename($1, $3), $2); end_declaration_level(); block_level--; } | notype_direct_declarator type_attribute ; type_direct_declarator: type_attribute_list_opt identifier { $$ = declarator_name(getsym($2)); } | type_attribute_list_opt T_LPAREN type_declarator T_RPAREN { $$ = $3; } | type_direct_declarator T_LBRACK array_size_opt T_RBRACK { $$ = add_array($1, $3.has_dim, $3.dim); } | type_direct_declarator param_list asm_or_symbolrename_opt { $$ = add_function(symbolrename($1, $3), $2); end_declaration_level(); block_level--; } | type_direct_declarator type_attribute ; /* * The two distinct rules type_param_declarator and notype_param_declarator * avoid a conflict in argument lists. A typename enclosed in parentheses is * always treated as a typename, not an argument name. For example, after * "typedef double a;", the declaration "f(int (a));" is interpreted as * "f(int (double));", not "f(int a);". */ type_param_declarator: direct_param_declarator | pointer direct_param_declarator { $$ = add_pointer($2, $1); } ; notype_param_declarator: direct_notype_param_declarator | pointer direct_notype_param_declarator { $$ = add_pointer($2, $1); } ; direct_param_declarator: identifier type_attribute_list { $$ = declarator_name(getsym($1)); } | identifier { $$ = declarator_name(getsym($1)); } | T_LPAREN notype_param_declarator T_RPAREN { $$ = $2; } | direct_param_declarator T_LBRACK array_size_opt T_RBRACK gcc_attribute_specifier_list_opt { $$ = add_array($1, $3.has_dim, $3.dim); } | direct_param_declarator param_list asm_or_symbolrename_opt { $$ = add_function(symbolrename($1, $3), $2); end_declaration_level(); block_level--; } ; direct_notype_param_declarator: identifier { $$ = declarator_name(getsym($1)); } | T_LPAREN notype_param_declarator T_RPAREN { $$ = $2; } | direct_notype_param_declarator T_LBRACK array_size_opt T_RBRACK { $$ = add_array($1, $3.has_dim, $3.dim); } | direct_notype_param_declarator param_list asm_or_symbolrename_opt { $$ = add_function(symbolrename($1, $3), $2); end_declaration_level(); block_level--; } ; param_list: id_list_lparen identifier_list T_RPAREN { $$ = $2; } | abstract_decl_param_list ; id_list_lparen: T_LPAREN { block_level++; begin_declaration_level(DK_PROTO_ARG); } ; array_size_opt: /* empty */ { $$.has_dim = false; $$.dim = 0; } | T_ASTERISK { /* since C99; variable length array of unspecified size */ $$.has_dim = false; /* TODO: maybe change to true */ $$.dim = 0; /* just as a placeholder */ } | array_size { $$.has_dim = true; $$.dim = $1 == NULL ? 0 : to_int_constant($1, false); } ; array_size: type_qualifier_list_opt T_SCLASS constant_expr { /* C11 6.7.6.3p7 */ if ($2 != STATIC) yyerror("Bad attribute"); /* static array size is a C11 extension */ c11ism(343); $$ = $3; } | T_QUAL { /* C11 6.7.6.2 */ if ($1 != RESTRICT) yyerror("Bad attribute"); $$ = NULL; } | constant_expr ; identifier_list: /* C99 6.7.5 */ T_NAME { $$ = old_style_function_name(getsym($1)); } | identifier_list T_COMMA T_NAME { $$ = concat_lists($1, old_style_function_name(getsym($3))); } | identifier_list error ; /* XXX: C99 requires an additional specifier-qualifier-list. */ type_name: /* C99 6.7.6 */ { begin_declaration_level(DK_ABSTRACT); } abstract_declaration { end_declaration_level(); $$ = $2->s_type; } ; abstract_declaration: /* specific to lint */ begin_type_qualifier_list end_type { $$ = declare_1_abstract(abstract_name()); } | begin_type_specifier_qualifier_list end_type { $$ = declare_1_abstract(abstract_name()); } | begin_type_qualifier_list end_type abstract_declarator { $$ = declare_1_abstract($3); } | begin_type_specifier_qualifier_list end_type abstract_declarator { $$ = declare_1_abstract($3); } ; /* K&R 8.7, C90 ???, C99 6.7.6, C11 6.7.7 */ /* In K&R, abstract-declarator could be empty and was still simpler. */ abstract_declarator: pointer { $$ = add_pointer(abstract_name(), $1); } | direct_abstract_declarator | pointer direct_abstract_declarator { $$ = add_pointer($2, $1); } | type_attribute_list direct_abstract_declarator { $$ = $2; } | pointer type_attribute_list direct_abstract_declarator { $$ = add_pointer($3, $1); } ; /* K&R ---, C90 ???, C99 6.7.6, C11 6.7.7 */ direct_abstract_declarator: /* TODO: sort rules according to C99 */ T_LPAREN abstract_declarator T_RPAREN { $$ = $2; } | T_LBRACK array_size_opt T_RBRACK { $$ = add_array(abstract_name(), $2.has_dim, $2.dim); } | direct_abstract_declarator T_LBRACK array_size_opt T_RBRACK { $$ = add_array($1, $3.has_dim, $3.dim); } | abstract_decl_param_list asm_or_symbolrename_opt { $$ = add_function(symbolrename(abstract_name(), $2), $1); end_declaration_level(); block_level--; } | direct_abstract_declarator abstract_decl_param_list asm_or_symbolrename_opt { $$ = add_function(symbolrename($1, $3), $2); end_declaration_level(); block_level--; } | direct_abstract_declarator type_attribute_list ; abstract_decl_param_list: /* specific to lint */ abstract_decl_lparen T_RPAREN type_attribute_opt { $$ = NULL; } | abstract_decl_lparen vararg_parameter_type_list T_RPAREN type_attribute_opt { dcs->d_proto = true; $$ = $2; } | abstract_decl_lparen error T_RPAREN type_attribute_opt { $$ = NULL; } ; abstract_decl_lparen: /* specific to lint */ T_LPAREN { block_level++; begin_declaration_level(DK_PROTO_ARG); } ; vararg_parameter_type_list: /* specific to lint */ parameter_type_list | parameter_type_list T_COMMA T_ELLIPSIS { dcs->d_vararg = true; $$ = $1; } | T_ELLIPSIS { /* TODO: C99 6.7.5 makes this an error as well. */ if (!allow_trad && !allow_c99) { /* ANSI C requires formal parameter before '...' */ error(84); } else if (allow_c90) { /* ANSI C requires formal parameter before '...' */ warning(84); } dcs->d_vararg = true; $$ = NULL; } ; /* XXX: C99 6.7.5 defines the same name, but it looks different. */ parameter_type_list: parameter_declaration | parameter_type_list T_COMMA parameter_declaration { $$ = concat_lists($1, $3); } ; /* XXX: C99 6.7.5 defines the same name, but it looks completely different. */ parameter_declaration: begin_type_declmods end_type { /* ^^ There is no check for the missing type-specifier. */ $$ = declare_argument(abstract_name(), false); } | begin_type_declaration_specifiers end_type { $$ = declare_argument(abstract_name(), false); } | begin_type_declmods end_type notype_param_declarator { /* ^^ There is no check for the missing type-specifier. */ $$ = declare_argument($3, false); } /* * type_param_declarator is needed because of following conflict: * "typedef int a; f(int (a));" could be parsed as * "function with argument a of type int", or * "function with an abstract argument of type function". * This grammar realizes the second case. */ | begin_type_declaration_specifiers end_type type_param_declarator { $$ = declare_argument($3, false); } | begin_type_declmods end_type abstract_declarator { /* ^^ There is no check for the missing type-specifier. */ $$ = declare_argument($3, false); } | begin_type_declaration_specifiers end_type abstract_declarator { $$ = declare_argument($3, false); } ; initializer: /* C99 6.7.8 "Initialization" */ assignment_expression { init_expr($1); } | init_lbrace init_rbrace { /* XXX: Empty braces are not covered by C99 6.7.8. */ } | init_lbrace initializer_list comma_opt init_rbrace /* XXX: What is this error handling for? */ | error ; initializer_list: /* C99 6.7.8 "Initialization" */ initializer_list_item | initializer_list T_COMMA initializer_list_item ; initializer_list_item: /* helper */ designation initializer | initializer ; designation: /* C99 6.7.8 "Initialization" */ begin_designation designator_list T_ASSIGN | identifier T_COLON { /* GCC style struct or union member name in initializer */ gnuism(315); begin_designation(); add_designator_member($1); } ; begin_designation: /* lint-specific helper */ /* empty */ { begin_designation(); } ; designator_list: /* C99 6.7.8 "Initialization" */ designator | designator_list designator ; designator: /* C99 6.7.8 "Initialization" */ T_LBRACK range T_RBRACK { if (!allow_c99) /* array initializer with designators is a C99 ... */ warning(321); add_designator_subscript($2); } | T_POINT identifier { if (!allow_c99) /* struct or union member name in initializer is ... */ warning(313); add_designator_member($2); } ; static_assert_declaration: T_STATIC_ASSERT T_LPAREN constant_expr T_COMMA T_STRING T_RPAREN T_SEMI /* C11 */ | T_STATIC_ASSERT T_LPAREN constant_expr T_RPAREN T_SEMI /* C23 */ ; range: constant_expr { $$.lo = to_int_constant($1, true); $$.hi = $$.lo; } | constant_expr T_ELLIPSIS constant_expr { $$.lo = to_int_constant($1, true); $$.hi = to_int_constant($3, true); /* initialization with '[a...b]' is a GCC extension */ gnuism(340); } ; init_lbrace: /* helper */ T_LBRACE { init_lbrace(); } ; init_rbrace: /* helper */ T_RBRACE { init_rbrace(); } ; asm_or_symbolrename_opt: /* GCC extensions */ /* empty */ { $$ = NULL; } | T_ASM T_LPAREN T_STRING T_RPAREN gcc_attribute_specifier_list_opt { freeyyv(&$3, T_STRING); $$ = NULL; } | T_SYMBOLRENAME T_LPAREN T_NAME T_RPAREN gcc_attribute_specifier_list_opt { $$ = $3; } ; statement: /* C99 6.8 */ expression_statement | non_expr_statement ; non_expr_statement: /* helper for C99 6.8 */ gcc_attribute_specifier /* ((__fallthrough__)) */ T_SEMI | labeled_statement | compound_statement | selection_statement | iteration_statement | jump_statement { seen_fallthrough = false; } | asm_statement ; labeled_statement: /* C99 6.8.1 */ label gcc_attribute_specifier_list_opt statement ; label: T_NAME T_COLON { symtyp = FLABEL; named_label(getsym($1)); } | T_CASE constant_expr T_COLON { case_label($2); seen_fallthrough = true; } | T_CASE constant_expr T_ELLIPSIS constant_expr T_COLON { /* XXX: We don't fill all cases */ case_label($2); seen_fallthrough = true; } | T_DEFAULT T_COLON { default_label(); seen_fallthrough = true; } ; compound_statement: /* C99 6.8.2 */ compound_statement_lbrace compound_statement_rbrace | compound_statement_lbrace block_item_list compound_statement_rbrace ; compound_statement_lbrace: T_LBRACE { block_level++; mem_block_level++; begin_declaration_level(DK_AUTO); } ; compound_statement_rbrace: T_RBRACE { end_declaration_level(); level_free_all(mem_block_level); mem_block_level--; block_level--; seen_fallthrough = false; } ; block_item_list: /* C99 6.8.2 */ block_item | block_item_list block_item { if ($1 && !$2) /* declarations after statements is a C99 feature */ c99ism(327); $$ = $1 || $2; } ; block_item: /* C99 6.8.2 */ declaration_or_error { $$ = false; restore_warning_flags(); } | statement { $$ = true; restore_warning_flags(); } ; expression_statement: /* C99 6.8.3 */ expression T_SEMI { expr($1, false, false, false, false); seen_fallthrough = false; } | T_SEMI { check_statement_reachable(); seen_fallthrough = false; } ; selection_statement: /* C99 6.8.4 */ if_without_else %prec T_THEN { save_warning_flags(); if2(); if3(false); } | if_without_else T_ELSE { save_warning_flags(); if2(); } statement { clear_warning_flags(); if3(true); } | if_without_else T_ELSE error { clear_warning_flags(); if3(false); } | switch_expr statement { clear_warning_flags(); switch2(); } | switch_expr error { clear_warning_flags(); switch2(); } ; if_without_else: /* see C99 6.8.4 */ if_expr statement | if_expr error ; if_expr: /* see C99 6.8.4 */ T_IF T_LPAREN expression T_RPAREN { if1($3); clear_warning_flags(); } ; switch_expr: /* see C99 6.8.4 */ T_SWITCH T_LPAREN expression T_RPAREN { switch1($3); clear_warning_flags(); } ; iteration_statement: /* C99 6.8.5 */ while_expr statement { clear_warning_flags(); while2(); } | while_expr error { clear_warning_flags(); while2(); } | do_statement do_while_expr { do2($2); seen_fallthrough = false; } | do error { clear_warning_flags(); do2(NULL); } | for_exprs statement { clear_warning_flags(); for2(); end_declaration_level(); block_level--; } | for_exprs error { clear_warning_flags(); for2(); end_declaration_level(); block_level--; } ; while_expr: /* see C99 6.8.5 */ T_WHILE T_LPAREN expression T_RPAREN { while1($3); clear_warning_flags(); } ; do_statement: /* see C99 6.8.5 */ do statement { clear_warning_flags(); } ; do: /* see C99 6.8.5 */ T_DO { do1(); } ; do_while_expr: /* see C99 6.8.5 */ T_WHILE T_LPAREN expression T_RPAREN T_SEMI { $$ = $3; } ; for_start: /* see C99 6.8.5 */ T_FOR T_LPAREN { begin_declaration_level(DK_AUTO); block_level++; } ; for_exprs: /* see C99 6.8.5 */ for_start begin_type_declaration_specifiers end_type notype_init_declarators T_SEMI expression_opt T_SEMI expression_opt T_RPAREN { /* variable declaration in for loop */ c99ism(325); for1(NULL, $6, $8); clear_warning_flags(); } | for_start expression_opt T_SEMI expression_opt T_SEMI expression_opt T_RPAREN { for1($2, $4, $6); clear_warning_flags(); } ; jump_statement: /* C99 6.8.6 */ goto identifier T_SEMI { do_goto(getsym($2)); } | goto error T_SEMI { symtyp = FVFT; } | T_CONTINUE T_SEMI { do_continue(); } | T_BREAK T_SEMI { do_break(); } | T_RETURN sys T_SEMI { do_return($2, NULL); } | T_RETURN sys expression T_SEMI { do_return($2, $3); } ; goto: /* see C99 6.8.6 */ T_GOTO { symtyp = FLABEL; } ; asm_statement: /* GCC extension */ T_ASM T_LPAREN read_until_rparen T_SEMI { dcs_set_asm(); } | T_ASM T_QUAL T_LPAREN read_until_rparen T_SEMI { dcs_set_asm(); } | T_ASM error ; read_until_rparen: /* helper for 'asm_statement' */ /* empty */ { read_until_rparen(); } ; translation_unit: /* C99 6.9 */ external_declaration | translation_unit external_declaration ; external_declaration: /* C99 6.9 */ function_definition { global_clean_up_decl(false); clear_warning_flags(); } | top_level_declaration { global_clean_up_decl(false); clear_warning_flags(); } | asm_statement /* GCC extension */ | T_SEMI { /* GCC extension */ /* * TODO: Only allow this in GCC mode, not in plain C99. * This is one of the top 10 warnings in the NetBSD build. */ if (!allow_trad && !allow_c99) { /* empty declaration */ error(0); } else if (allow_c90) { /* empty declaration */ warning(0); } } ; /* * On the top level, lint allows several forms of declarations that it doesn't * allow in functions. For example, a single ';' is an empty declaration and * is supported by some compilers, but in a function it would be an empty * statement, not a declaration. This makes a difference in C90 mode, where * a statement must not be followed by a declaration. * * See 'declaration' for all other declarations. */ top_level_declaration: /* C99 6.9 calls this 'declaration' */ begin_type end_type notype_init_declarators T_SEMI { /* TODO: Make this an error in C99 mode as well. */ if (!allow_trad && !allow_c99) { /* old-style declaration; add 'int' */ error(1); } else if (allow_c90) { /* old-style declaration; add 'int' */ warning(1); } } | declaration | error T_SEMI { global_clean_up(); } | error T_RBRACE { global_clean_up(); } ; function_definition: /* C99 6.9.1 */ func_declarator { if ($1->s_type->t_tspec != FUNC) { /* syntax error '%s' */ error(249, yytext); YYERROR; } if ($1->s_type->t_typedef) { /* ()-less function definition */ error(64); YYERROR; } funcdef($1); block_level++; begin_declaration_level(DK_OLD_STYLE_ARG); if (lwarn == LWARN_NONE) $1->s_used = true; } arg_declaration_list_opt { end_declaration_level(); block_level--; check_func_lint_directives(); check_func_old_style_arguments(); begin_control_statement(CS_FUNCTION_BODY); } compound_statement { funcend(); end_control_statement(CS_FUNCTION_BODY); } ; func_declarator: begin_type end_type notype_declarator { if (!allow_trad) { /* old-style declaration; add 'int' */ error(1); } $$ = $3; } | begin_type_declmods end_type notype_declarator { if (!allow_trad) { /* old-style declaration; add 'int' */ error(1); } $$ = $3; } | begin_type_declaration_specifiers end_type type_declarator { $$ = $3; } ; arg_declaration_list_opt: /* C99 6.9.1p13 example 1 */ /* empty */ | arg_declaration_list ; arg_declaration_list: /* C99 6.9.1p13 example 1 */ arg_declaration | arg_declaration_list arg_declaration /* XXX or better "arg_declaration error" ? */ | error ; /* * "arg_declaration" is separated from "declaration" because it * needs other error handling. */ arg_declaration: begin_type_declmods end_type T_SEMI { /* empty declaration */ warning(2); } | begin_type_declmods end_type notype_init_declarators T_SEMI | begin_type_declaration_specifiers end_type T_SEMI { if (!dcs->d_nonempty_decl) { /* empty declaration */ warning(2); } else { /* '%s' declared in argument declaration list */ warning(3, type_name(dcs->d_type)); } } | begin_type_declaration_specifiers end_type type_init_declarators T_SEMI { if (dcs->d_nonempty_decl) { /* '%s' declared in argument declaration list */ warning(3, type_name(dcs->d_type)); } } | begin_type_declmods error | begin_type_declaration_specifiers error ; /* https://gcc.gnu.org/onlinedocs/gcc/Attribute-Syntax.html */ gcc_attribute_specifier_list_opt: /* empty */ | gcc_attribute_specifier_list ; gcc_attribute_specifier_list: gcc_attribute_specifier | gcc_attribute_specifier_list gcc_attribute_specifier ; gcc_attribute_specifier: T_ATTRIBUTE T_LPAREN T_LPAREN { in_gcc_attribute = true; } gcc_attribute_list { in_gcc_attribute = false; } T_RPAREN T_RPAREN ; gcc_attribute_list: gcc_attribute | gcc_attribute_list T_COMMA gcc_attribute ; gcc_attribute: /* empty */ | T_NAME { const char *name = $1->sb_name; if (is_either(name, "packed", "__packed__")) dcs_add_packed(); else if (is_either(name, "used", "__used__") || is_either(name, "unused", "__unused__")) dcs_set_used(); else if (is_either(name, "fallthrough", "__fallthrough__")) fallthru(1); } | T_NAME T_LPAREN T_RPAREN | T_NAME T_LPAREN gcc_attribute_parameters T_RPAREN | T_QUAL { if ($1 != CONST) yyerror("Bad attribute"); } ; gcc_attribute_parameters: constant_expr | gcc_attribute_parameters T_COMMA constant_expr ; sys: /* empty */ { $$ = in_system_header; } ; %% /* ARGSUSED */ int yyerror(const char *msg) { /* syntax error '%s' */ error(249, yytext); if (++sytxerr >= 5) norecover(); return 0; } #if YYDEBUG && (YYBYACC || YYBISON) static const char * cgram_to_string(int token, YYSTYPE val) { switch (token) { case T_INCDEC: case T_MULTIPLICATIVE: case T_ADDITIVE: case T_SHIFT: case T_RELATIONAL: case T_EQUALITY: case T_OPASSIGN: return modtab[val.y_op].m_name; case T_SCLASS: return scl_name(val.y_scl); case T_TYPE: case T_STRUCT_OR_UNION: return tspec_name(val.y_tspec); case T_QUAL: return tqual_name(val.y_tqual); case T_NAME: return val.y_name->sb_name; default: return ""; } } #endif #if YYDEBUG && YYBISON static inline void cgram_print(FILE *output, int token, YYSTYPE val) { (void)fprintf(output, "%s", cgram_to_string(token, val)); } #endif static void cgram_declare(sym_t *decl, bool initflg, sbuf_t *renaming) { declare(decl, initflg, renaming); if (renaming != NULL) freeyyv(&renaming, T_NAME); } /* * Discard all input tokens up to and including the next * unmatched right paren */ static void read_until_rparen(void) { int level; if (yychar < 0) yychar = yylex(); freeyyv(&yylval, yychar); level = 1; while (yychar != T_RPAREN || --level > 0) { if (yychar == T_LPAREN) { level++; } else if (yychar <= 0) { break; } freeyyv(&yylval, yychar = yylex()); } yyclearin; } static sym_t * symbolrename(sym_t *s, sbuf_t *sb) { if (sb != NULL) s->s_rename = sb->sb_name; return s; }