511 lines
11 KiB
Plaintext
511 lines
11 KiB
Plaintext
/* 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 <rth@tamu.edu>
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* Based on original work by Bjorn Ekwall <bj0rn@blox.se>
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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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