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/* SPDX-License-Identifier: GPL-2.0-or-later */ /* * C global declaration parser for genksyms. * Copyright 1996, 1997 Linux International. * * New implementation contributed by Richard Henderson <rth@tamu.edu> * Based on original work by Bjorn Ekwall <bj0rn@blox.se> * * This file is part of the Linux modutils. */ %{ #include <assert.h> #include <stdlib.h> #include <string.h> #include "genksyms.h" static int is_typedef; static int is_extern; static char *current_name; static struct string_list *decl_spec; static void yyerror(const char *); static inline void remove_node(struct string_list **p) { struct string_list *node = *p; *p = node->next; free_node(node); } static inline void remove_list(struct string_list **pb, struct string_list **pe) { struct string_list *b = *pb, *e = *pe; *pb = e; free_list(b, e); } /* Record definition of a struct/union/enum */ static void record_compound(struct string_list **keyw, struct string_list **ident, struct string_list **body, enum symbol_type type) { struct string_list *b = *body, *i = *ident, *r; if (i->in_source_file) { remove_node(keyw); (*ident)->tag = type; remove_list(body, ident); return; } r = copy_node(i); r->tag = type; r->next = (*keyw)->next; *body = r; (*keyw)->next = NULL; add_symbol(i->string, type, b, is_extern); } %} %token ASM_KEYW %token ATTRIBUTE_KEYW %token AUTO_KEYW %token BOOL_KEYW %token BUILTIN_INT_KEYW %token CHAR_KEYW %token CONST_KEYW %token DOUBLE_KEYW %token ENUM_KEYW %token EXTERN_KEYW %token EXTENSION_KEYW %token FLOAT_KEYW %token INLINE_KEYW %token INT_KEYW %token LONG_KEYW %token REGISTER_KEYW %token RESTRICT_KEYW %token SHORT_KEYW %token SIGNED_KEYW %token STATIC_KEYW %token STRUCT_KEYW %token TYPEDEF_KEYW %token UNION_KEYW %token UNSIGNED_KEYW %token VOID_KEYW %token VOLATILE_KEYW %token TYPEOF_KEYW %token VA_LIST_KEYW %token EXPORT_SYMBOL_KEYW %token ASM_PHRASE %token ATTRIBUTE_PHRASE %token TYPEOF_PHRASE %token BRACE_PHRASE %token BRACKET_PHRASE %token EXPRESSION_PHRASE %token CHAR %token DOTS %token IDENT %token INT %token REAL %token STRING %token TYPE %token OTHER %token FILENAME %% declaration_seq: declaration | declaration_seq declaration ; declaration: { is_typedef = 0; is_extern = 0; current_name = NULL; decl_spec = NULL; } declaration1 { free_list(*$2, NULL); *$2 = NULL; } ; declaration1: EXTENSION_KEYW TYPEDEF_KEYW { is_typedef = 1; } simple_declaration { $$ = $4; } | TYPEDEF_KEYW { is_typedef = 1; } simple_declaration { $$ = $3; } | simple_declaration | function_definition | asm_definition | export_definition | error ';' { $$ = $2; } | error '}' { $$ = $2; } ; simple_declaration: decl_specifier_seq_opt init_declarator_list_opt ';' { if (current_name) { struct string_list *decl = (*$3)->next; (*$3)->next = NULL; add_symbol(current_name, is_typedef ? SYM_TYPEDEF : SYM_NORMAL, decl, is_extern); current_name = NULL; } $$ = $3; } ; init_declarator_list_opt: /* empty */ { $$ = NULL; } | init_declarator_list ; init_declarator_list: init_declarator { struct string_list *decl = *$1; *$1 = NULL; add_symbol(current_name, is_typedef ? SYM_TYPEDEF : SYM_NORMAL, decl, is_extern); current_name = NULL; $$ = $1; } | init_declarator_list ',' init_declarator { struct string_list *decl = *$3; *$3 = NULL; free_list(*$2, NULL); *$2 = decl_spec; add_symbol(current_name, is_typedef ? SYM_TYPEDEF : SYM_NORMAL, decl, is_extern); current_name = NULL; $$ = $3; } ; init_declarator: declarator asm_phrase_opt attribute_opt initializer_opt { $$ = $4 ? $4 : $3 ? $3 : $2 ? $2 : $1; } ; /* Hang on to the specifiers so that we can reuse them. */ decl_specifier_seq_opt: /* empty */ { decl_spec = NULL; } | decl_specifier_seq ; decl_specifier_seq: decl_specifier { decl_spec = *$1; } | decl_specifier_seq decl_specifier { decl_spec = *$2; } ; decl_specifier: storage_class_specifier { /* Version 2 checksumming ignores storage class, as that is really irrelevant to the linkage. */ remove_node($1); $$ = $1; } | type_specifier ; storage_class_specifier: AUTO_KEYW | REGISTER_KEYW | STATIC_KEYW | EXTERN_KEYW { is_extern = 1; $$ = $1; } | INLINE_KEYW { is_extern = 0; $$ = $1; } ; type_specifier: simple_type_specifier | cvar_qualifier | TYPEOF_KEYW '(' parameter_declaration ')' | TYPEOF_PHRASE /* References to s/u/e's defined elsewhere. Rearrange things so that it is easier to expand the definition fully later. */ | STRUCT_KEYW IDENT { remove_node($1); (*$2)->tag = SYM_STRUCT; $$ = $2; } | UNION_KEYW IDENT { remove_node($1); (*$2)->tag = SYM_UNION; $$ = $2; } | ENUM_KEYW IDENT { remove_node($1); (*$2)->tag = SYM_ENUM; $$ = $2; } /* Full definitions of an s/u/e. Record it. */ | STRUCT_KEYW IDENT class_body { record_compound($1, $2, $3, SYM_STRUCT); $$ = $3; } | UNION_KEYW IDENT class_body { record_compound($1, $2, $3, SYM_UNION); $$ = $3; } | ENUM_KEYW IDENT enum_body { record_compound($1, $2, $3, SYM_ENUM); $$ = $3; } /* * Anonymous enum definition. Tell add_symbol() to restart its counter. */ | ENUM_KEYW enum_body { add_symbol(NULL, SYM_ENUM, NULL, 0); $$ = $2; } /* Anonymous s/u definitions. Nothing needs doing. */ | STRUCT_KEYW class_body { $$ = $2; } | UNION_KEYW class_body { $$ = $2; } ; simple_type_specifier: CHAR_KEYW | SHORT_KEYW | INT_KEYW | LONG_KEYW | SIGNED_KEYW | UNSIGNED_KEYW | FLOAT_KEYW | DOUBLE_KEYW | VOID_KEYW | BOOL_KEYW | VA_LIST_KEYW | BUILTIN_INT_KEYW | TYPE { (*$1)->tag = SYM_TYPEDEF; $$ = $1; } ; ptr_operator: '*' cvar_qualifier_seq_opt { $$ = $2 ? $2 : $1; } ; cvar_qualifier_seq_opt: /* empty */ { $$ = NULL; } | cvar_qualifier_seq ; cvar_qualifier_seq: cvar_qualifier | cvar_qualifier_seq cvar_qualifier { $$ = $2; } ; cvar_qualifier: CONST_KEYW | VOLATILE_KEYW | ATTRIBUTE_PHRASE | RESTRICT_KEYW { /* restrict has no effect in prototypes so ignore it */ remove_node($1); $$ = $1; } ; declarator: ptr_operator declarator { $$ = $2; } | direct_declarator ; direct_declarator: IDENT { if (current_name != NULL) { error_with_pos("unexpected second declaration name"); YYERROR; } else { current_name = (*$1)->string; $$ = $1; } } | TYPE { if (current_name != NULL) { error_with_pos("unexpected second declaration name"); YYERROR; } else { current_name = (*$1)->string; $$ = $1; } } | direct_declarator '(' parameter_declaration_clause ')' { $$ = $4; } | direct_declarator '(' error ')' { $$ = $4; } | direct_declarator BRACKET_PHRASE { $$ = $2; } | '(' declarator ')' { $$ = $3; } ; /* Nested declarators differ from regular declarators in that they do not record the symbols they find in the global symbol table. */ nested_declarator: ptr_operator nested_declarator { $$ = $2; } | direct_nested_declarator ; direct_nested_declarator: IDENT | TYPE | direct_nested_declarator '(' parameter_declaration_clause ')' { $$ = $4; } | direct_nested_declarator '(' error ')' { $$ = $4; } | direct_nested_declarator BRACKET_PHRASE { $$ = $2; } | '(' nested_declarator ')' { $$ = $3; } | '(' error ')' { $$ = $3; } ; parameter_declaration_clause: parameter_declaration_list_opt DOTS { $$ = $2; } | parameter_declaration_list_opt | parameter_declaration_list ',' DOTS { $$ = $3; } ; parameter_declaration_list_opt: /* empty */ { $$ = NULL; } | parameter_declaration_list ; parameter_declaration_list: parameter_declaration | parameter_declaration_list ',' parameter_declaration { $$ = $3; } ; parameter_declaration: decl_specifier_seq m_abstract_declarator { $$ = $2 ? $2 : $1; } ; m_abstract_declarator: ptr_operator m_abstract_declarator { $$ = $2 ? $2 : $1; } | direct_m_abstract_declarator ; direct_m_abstract_declarator: /* empty */ { $$ = NULL; } | IDENT { /* For version 2 checksums, we don't want to remember private parameter names. */ remove_node($1); $$ = $1; } /* This wasn't really a typedef name but an identifier that shadows one. */ | TYPE { remove_node($1); $$ = $1; } | direct_m_abstract_declarator '(' parameter_declaration_clause ')' { $$ = $4; } | direct_m_abstract_declarator '(' error ')' { $$ = $4; } | direct_m_abstract_declarator BRACKET_PHRASE { $$ = $2; } | '(' m_abstract_declarator ')' { $$ = $3; } | '(' error ')' { $$ = $3; } ; function_definition: decl_specifier_seq_opt declarator BRACE_PHRASE { struct string_list *decl = *$2; *$2 = NULL; add_symbol(current_name, SYM_NORMAL, decl, is_extern); $$ = $3; } ; initializer_opt: /* empty */ { $$ = NULL; } | initializer ; /* We never care about the contents of an initializer. */ initializer: '=' EXPRESSION_PHRASE { remove_list($2, &(*$1)->next); $$ = $2; } ; class_body: '{' member_specification_opt '}' { $$ = $3; } | '{' error '}' { $$ = $3; } ; member_specification_opt: /* empty */ { $$ = NULL; } | member_specification ; member_specification: member_declaration | member_specification member_declaration { $$ = $2; } ; member_declaration: decl_specifier_seq_opt member_declarator_list_opt ';' { $$ = $3; } | error ';' { $$ = $2; } ; member_declarator_list_opt: /* empty */ { $$ = NULL; } | member_declarator_list ; member_declarator_list: member_declarator | member_declarator_list ',' member_declarator { $$ = $3; } ; member_declarator: nested_declarator attribute_opt { $$ = $2 ? $2 : $1; } | IDENT member_bitfield_declarator { $$ = $2; } | member_bitfield_declarator ; member_bitfield_declarator: ':' EXPRESSION_PHRASE { $$ = $2; } ; attribute_opt: /* empty */ { $$ = NULL; } | attribute_opt ATTRIBUTE_PHRASE ; enum_body: '{' enumerator_list '}' { $$ = $3; } | '{' enumerator_list ',' '}' { $$ = $4; } ; enumerator_list: enumerator | enumerator_list ',' enumerator enumerator: IDENT { const char *name = strdup((*$1)->string); add_symbol(name, SYM_ENUM_CONST, NULL, 0); } | IDENT '=' EXPRESSION_PHRASE { const char *name = strdup((*$1)->string); struct string_list *expr = copy_list_range(*$3, *$2); add_symbol(name, SYM_ENUM_CONST, expr, 0); } asm_definition: ASM_PHRASE ';' { $$ = $2; } ; asm_phrase_opt: /* empty */ { $$ = NULL; } | ASM_PHRASE ; export_definition: EXPORT_SYMBOL_KEYW '(' IDENT ')' ';' { export_symbol((*$3)->string); $$ = $5; } ; %% static void yyerror(const char *e) { error_with_pos("%s", e); }
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