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