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+/* 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.
+
+ This program is free software; you can redistribute it and/or modify it
+ under the terms of the GNU General Public License as published by the
+ Free Software Foundation; either version 2 of the License, or (at your
+ option) any later version.
+
+ This program is distributed in the hope that it will be useful, but
+ WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software Foundation,
+ Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
+
+
+%{
+
+#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 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 EXPORT_SYMBOL_KEYW
+
+%token ASM_PHRASE
+%token ATTRIBUTE_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 '(' decl_specifier_seq '*' ')'
+ | TYPEOF_KEYW '(' decl_specifier_seq ')'
+
+ /* 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 { $$ = $2; }
+ ;
+
+simple_type_specifier:
+ CHAR_KEYW
+ | SHORT_KEYW
+ | INT_KEYW
+ | LONG_KEYW
+ | SIGNED_KEYW
+ | UNSIGNED_KEYW
+ | FLOAT_KEYW
+ | DOUBLE_KEYW
+ | VOID_KEYW
+ | BOOL_KEYW
+ | TYPE { (*$1)->tag = SYM_TYPEDEF; $$ = $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;
+ }
+ }
+ | direct_declarator '(' parameter_declaration_clause ')'
+ { $$ = $4; }
+ | direct_declarator '(' error ')'
+ { $$ = $4; }
+ | direct_declarator BRACKET_PHRASE
+ { $$ = $2; }
+ | '(' declarator ')'
+ { $$ = $3; }
+ | '(' error ')'
+ { $$ = $3; }
+ ;
+
+/* Nested declarators differ from regular declarators in that they do
+ not record the symbols they find in the global symbol table. */
+nested_declarator:
+ ptr_operator nested_declarator { $$ = $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);
+}
generated by cgit (git 2.34.1) at 2024-12-20 12:44:33 +0000