FM / genksyms

/usr/src/linux-headers-5.15.0-190/scripts/genksyms/

/usr/src/linux-headers-5.15.0-190/scripts/genksyms

Name	Size	Mode	Actions
.gitignore	50	0644	edit dl rm
genksyms.c	22690	0644	edit dl rm
genksyms.h	2094	0644	edit dl rm
keywords.c	2251	0644	edit dl rm
lex.l	8463	0644	edit dl rm
Makefile	951	0644	edit dl rm
parse.y	11183	0644	edit dl rm

Edit: /usr/src/linux-headers-5.15.0-190/scripts/genksyms/parse.y (11183B)

/* 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 STATIC_ASSERT_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 STATIC_ASSERT_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
	| static_assert
	| 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 */			{ $$ = NULL; }
	| init_declarator_list		{ free_list(decl_spec, NULL); $$ = $1; }
	;

init_declarator_list:
	init_declarator
		{ struct string_list *decl = *$1;
		  *$1 = NULL;

/* avoid sharing among multiple init_declarators */
		  if (decl_spec)
		    decl_spec = copy_list_range(decl_spec, 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;

/* avoid sharing among multiple init_declarators */
		  if (decl_spec)
		    decl_spec = copy_list_range(decl_spec, NULL);

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 = (*$1)->string;
			add_symbol(name, SYM_ENUM_CONST, NULL, 0);
		}
	| IDENT '=' EXPRESSION_PHRASE
		{
			const char *name = (*$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; }
	;

/* Ignore any module scoped _Static_assert(...) */
static_assert:
	STATIC_ASSERT_PHRASE ';'			{ $$ = $2; }
	;

static void
yyerror(const char *e)
{
  error_with_pos("%s", e);
}

cmd: