leandrof/linux
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity
b10d5fd489
linux/scripts/kconfig/parser.y
Masahiro Yamada 09d5873e4d kconfig: allow only 'config', 'comment', and 'if' inside 'choice' 
The code block surrounded by 'if' ... 'endif' is reduced into if_stmt,
which is accepted in the 'choice' context. Therefore, you can write any
statements within a choice block by wrapping 'if y' ... 'end'.

For example, you can create a menu inside a choice, like follows:

---------------->8----------------
  choice
          prompt "choice"

  config A
          bool "A"

  config B
          bool "B"

  if y

  menu "strange menu"

  config C
          bool "C"

  endmenu

  endif

  endchoice
---------------->8----------------

I want to change such a weird structure into a syntax error.

In fact, the USB gadget Kconfig had used nested 'choice' for no good
reason until commit df8df5e4bc ("usb: get rid of 'choice' for
legacy gadget drivers") killed it.

I think the 'source' inside 'choice' is on the fence. It is at least
gramatically sensible as long as the included file contains only
bool/tristate configs. However, it makes the code unreadable, and people
tend to forget the fact that the file is included from the choice
block. Commit 10e5e6c249 ("usb: gadget: move choice ... endchoice to
legacy/Kconfig") got rid of the only usecase.

Going forward, you can only use 'config', 'comment', and 'if' inside
'choice'. This also recursively applies to 'if' blocks inside 'choice'.

Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
2020-05-12 13:28:30 +09:00

728 lines
15 KiB
Plaintext
Raw Blame History

/* SPDX-License-Identifier: GPL-2.0 */
/*
* Copyright (C) 2002 Roman Zippel <zippel@linux-m68k.org>
*/
%{
#include <ctype.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdbool.h>
#include "lkc.h"
#define printd(mask, fmt...) if (cdebug & (mask)) printf(fmt)
#define PRINTD 0x0001
#define DEBUG_PARSE 0x0002
int cdebug = PRINTD;
static void yyerror(const char *err);
static void zconfprint(const char *err, ...);
static void zconf_error(const char *err, ...);
static bool zconf_endtoken(const char *tokenname,
const char *expected_tokenname);
struct symbol *symbol_hash[SYMBOL_HASHSIZE];
static struct menu *current_menu, *current_entry;
%}
%union
{
char *string;
struct symbol *symbol;
struct expr *expr;
struct menu *menu;
enum symbol_type type;
enum variable_flavor flavor;
}
%token <string> T_HELPTEXT
%token <string> T_WORD
%token <string> T_WORD_QUOTE
%token T_ALLNOCONFIG_Y
%token T_BOOL
%token T_CHOICE
%token T_CLOSE_PAREN
%token T_COLON_EQUAL
%token T_COMMENT
%token T_CONFIG
%token T_DEFAULT
%token T_DEFCONFIG_LIST
%token T_DEF_BOOL
%token T_DEF_TRISTATE
%token T_DEPENDS
%token T_ENDCHOICE
%token T_ENDIF
%token T_ENDMENU
%token T_HELP
%token T_HEX
%token T_IF
%token T_IMPLY
%token T_INT
%token T_MAINMENU
%token T_MENU
%token T_MENUCONFIG
%token T_MODULES
%token T_ON
%token T_OPEN_PAREN
%token T_OPTION
%token T_OPTIONAL
%token T_PLUS_EQUAL
%token T_PROMPT
%token T_RANGE
%token T_SELECT
%token T_SOURCE
%token T_STRING
%token T_TRISTATE
%token T_VISIBLE
%token T_EOL
%token <string> T_ASSIGN_VAL
%left T_OR
%left T_AND
%left T_EQUAL T_UNEQUAL
%left T_LESS T_LESS_EQUAL T_GREATER T_GREATER_EQUAL
%nonassoc T_NOT
%type <symbol> nonconst_symbol
%type <symbol> symbol
%type <type> type logic_type default
%type <expr> expr
%type <expr> if_expr
%type <string> end
%type <menu> if_entry menu_entry choice_entry
%type <string> word_opt assign_val
%type <flavor> assign_op
%destructor {
fprintf(stderr, "%s:%d: missing end statement for this entry\n",
$$->file->name, $$->lineno);
if (current_menu == $$)
menu_end_menu();
} if_entry menu_entry choice_entry
%%
input: mainmenu_stmt stmt_list | stmt_list;
/* mainmenu entry */
mainmenu_stmt: T_MAINMENU T_WORD_QUOTE T_EOL
{
menu_add_prompt(P_MENU, $2, NULL);
};
stmt_list:
/* empty */
| stmt_list assignment_stmt
| stmt_list choice_stmt
| stmt_list comment_stmt
| stmt_list config_stmt
| stmt_list if_stmt
| stmt_list menu_stmt
| stmt_list menuconfig_stmt
| stmt_list source_stmt
| stmt_list T_WORD error T_EOL { zconf_error("unknown statement \"%s\"", $2); }
| stmt_list error T_EOL { zconf_error("invalid statement"); }
;
stmt_list_in_choice:
/* empty */
| stmt_list_in_choice comment_stmt
| stmt_list_in_choice config_stmt
| stmt_list_in_choice if_stmt_in_choice
| stmt_list_in_choice error T_EOL { zconf_error("invalid statement"); }
;
/* config/menuconfig entry */
config_entry_start: T_CONFIG nonconst_symbol T_EOL
{
$2->flags |= SYMBOL_OPTIONAL;
menu_add_entry($2);
printd(DEBUG_PARSE, "%s:%d:config %s\n", zconf_curname(), zconf_lineno(), $2->name);
};
config_stmt: config_entry_start config_option_list
{
printd(DEBUG_PARSE, "%s:%d:endconfig\n", zconf_curname(), zconf_lineno());
};
menuconfig_entry_start: T_MENUCONFIG nonconst_symbol T_EOL
{
$2->flags |= SYMBOL_OPTIONAL;
menu_add_entry($2);
printd(DEBUG_PARSE, "%s:%d:menuconfig %s\n", zconf_curname(), zconf_lineno(), $2->name);
};
menuconfig_stmt: menuconfig_entry_start config_option_list
{
if (current_entry->prompt)
current_entry->prompt->type = P_MENU;
else
zconfprint("warning: menuconfig statement without prompt");
printd(DEBUG_PARSE, "%s:%d:endconfig\n", zconf_curname(), zconf_lineno());
};
config_option_list:
/* empty */
| config_option_list config_option
| config_option_list depends
| config_option_list help
;
config_option: type prompt_stmt_opt T_EOL
{
menu_set_type($1);
printd(DEBUG_PARSE, "%s:%d:type(%u)\n",
zconf_curname(), zconf_lineno(),
$1);
};
config_option: T_PROMPT T_WORD_QUOTE if_expr T_EOL
{
menu_add_prompt(P_PROMPT, $2, $3);
printd(DEBUG_PARSE, "%s:%d:prompt\n", zconf_curname(), zconf_lineno());
};
config_option: default expr if_expr T_EOL
{
menu_add_expr(P_DEFAULT, $2, $3);
if ($1 != S_UNKNOWN)
menu_set_type($1);
printd(DEBUG_PARSE, "%s:%d:default(%u)\n",
zconf_curname(), zconf_lineno(),
$1);
};
config_option: T_SELECT nonconst_symbol if_expr T_EOL
{
menu_add_symbol(P_SELECT, $2, $3);
printd(DEBUG_PARSE, "%s:%d:select\n", zconf_curname(), zconf_lineno());
};
config_option: T_IMPLY nonconst_symbol if_expr T_EOL
{
menu_add_symbol(P_IMPLY, $2, $3);
printd(DEBUG_PARSE, "%s:%d:imply\n", zconf_curname(), zconf_lineno());
};
config_option: T_RANGE symbol symbol if_expr T_EOL
{
menu_add_expr(P_RANGE, expr_alloc_comp(E_RANGE,$2, $3), $4);
printd(DEBUG_PARSE, "%s:%d:range\n", zconf_curname(), zconf_lineno());
};
config_option: T_OPTION T_MODULES T_EOL
{
menu_add_option_modules();
};
config_option: T_OPTION T_DEFCONFIG_LIST T_EOL
{
menu_add_option_defconfig_list();
};
config_option: T_OPTION T_ALLNOCONFIG_Y T_EOL
{
menu_add_option_allnoconfig_y();
};
/* choice entry */
choice: T_CHOICE word_opt T_EOL
{
struct symbol *sym = sym_lookup($2, SYMBOL_CHOICE);
sym->flags |= SYMBOL_NO_WRITE;
menu_add_entry(sym);
menu_add_expr(P_CHOICE, NULL, NULL);
free($2);
printd(DEBUG_PARSE, "%s:%d:choice\n", zconf_curname(), zconf_lineno());
};
choice_entry: choice choice_option_list
{
$$ = menu_add_menu();
};
choice_end: end
{
if (zconf_endtoken($1, "choice")) {
menu_end_menu();
printd(DEBUG_PARSE, "%s:%d:endchoice\n", zconf_curname(), zconf_lineno());
}
};
choice_stmt: choice_entry stmt_list_in_choice choice_end
;
choice_option_list:
/* empty */
| choice_option_list choice_option
| choice_option_list depends
| choice_option_list help
;
choice_option: T_PROMPT T_WORD_QUOTE if_expr T_EOL
{
menu_add_prompt(P_PROMPT, $2, $3);
printd(DEBUG_PARSE, "%s:%d:prompt\n", zconf_curname(), zconf_lineno());
};
choice_option: logic_type prompt_stmt_opt T_EOL
{
menu_set_type($1);
printd(DEBUG_PARSE, "%s:%d:type(%u)\n",
zconf_curname(), zconf_lineno(), $1);
};
choice_option: T_OPTIONAL T_EOL
{
current_entry->sym->flags |= SYMBOL_OPTIONAL;
printd(DEBUG_PARSE, "%s:%d:optional\n", zconf_curname(), zconf_lineno());
};
choice_option: T_DEFAULT nonconst_symbol if_expr T_EOL
{
menu_add_symbol(P_DEFAULT, $2, $3);
printd(DEBUG_PARSE, "%s:%d:default\n",
zconf_curname(), zconf_lineno());
};
type:
logic_type
| T_INT { $$ = S_INT; }
| T_HEX { $$ = S_HEX; }
| T_STRING { $$ = S_STRING; }
logic_type:
T_BOOL { $$ = S_BOOLEAN; }
| T_TRISTATE { $$ = S_TRISTATE; }
default:
T_DEFAULT { $$ = S_UNKNOWN; }
| T_DEF_BOOL { $$ = S_BOOLEAN; }
| T_DEF_TRISTATE { $$ = S_TRISTATE; }
/* if entry */
if_entry: T_IF expr T_EOL
{
printd(DEBUG_PARSE, "%s:%d:if\n", zconf_curname(), zconf_lineno());
menu_add_entry(NULL);
menu_add_dep($2);
$$ = menu_add_menu();
};
if_end: end
{
if (zconf_endtoken($1, "if")) {
menu_end_menu();
printd(DEBUG_PARSE, "%s:%d:endif\n", zconf_curname(), zconf_lineno());
}
};
if_stmt: if_entry stmt_list if_end
;
if_stmt_in_choice: if_entry stmt_list_in_choice if_end
;
/* menu entry */
menu: T_MENU T_WORD_QUOTE T_EOL
{
menu_add_entry(NULL);
menu_add_prompt(P_MENU, $2, NULL);
printd(DEBUG_PARSE, "%s:%d:menu\n", zconf_curname(), zconf_lineno());
};
menu_entry: menu menu_option_list
{
$$ = menu_add_menu();
};
menu_end: end
{
if (zconf_endtoken($1, "menu")) {
menu_end_menu();
printd(DEBUG_PARSE, "%s:%d:endmenu\n", zconf_curname(), zconf_lineno());
}
};
menu_stmt: menu_entry stmt_list menu_end
;
menu_option_list:
/* empty */
| menu_option_list visible
| menu_option_list depends
;
source_stmt: T_SOURCE T_WORD_QUOTE T_EOL
{
printd(DEBUG_PARSE, "%s:%d:source %s\n", zconf_curname(), zconf_lineno(), $2);
zconf_nextfile($2);
free($2);
};
/* comment entry */
comment: T_COMMENT T_WORD_QUOTE T_EOL
{
menu_add_entry(NULL);
menu_add_prompt(P_COMMENT, $2, NULL);
printd(DEBUG_PARSE, "%s:%d:comment\n", zconf_curname(), zconf_lineno());
};
comment_stmt: comment comment_option_list
;
comment_option_list:
/* empty */
| comment_option_list depends
;
/* help option */
help_start: T_HELP T_EOL
{
printd(DEBUG_PARSE, "%s:%d:help\n", zconf_curname(), zconf_lineno());
zconf_starthelp();
};
help: help_start T_HELPTEXT
{
if (current_entry->help) {
free(current_entry->help);
zconfprint("warning: '%s' defined with more than one help text -- only the last one will be used",
current_entry->sym->name ?: "<choice>");
}
/* Is the help text empty or all whitespace? */
if ($2[strspn($2, " \f\n\r\t\v")] == '\0')
zconfprint("warning: '%s' defined with blank help text",
current_entry->sym->name ?: "<choice>");
current_entry->help = $2;
};
/* depends option */
depends: T_DEPENDS T_ON expr T_EOL
{
menu_add_dep($3);
printd(DEBUG_PARSE, "%s:%d:depends on\n", zconf_curname(), zconf_lineno());
};
/* visibility option */
visible: T_VISIBLE if_expr T_EOL
{
menu_add_visibility($2);
};
/* prompt statement */
prompt_stmt_opt:
/* empty */
| T_WORD_QUOTE if_expr
{
menu_add_prompt(P_PROMPT, $1, $2);
};
end: T_ENDMENU T_EOL { $$ = "menu"; }
| T_ENDCHOICE T_EOL { $$ = "choice"; }
| T_ENDIF T_EOL { $$ = "if"; }
;
if_expr: /* empty */ { $$ = NULL; }
| T_IF expr { $$ = $2; }
;
expr: symbol { $$ = expr_alloc_symbol($1); }
| symbol T_LESS symbol { $$ = expr_alloc_comp(E_LTH, $1, $3); }
| symbol T_LESS_EQUAL symbol { $$ = expr_alloc_comp(E_LEQ, $1, $3); }
| symbol T_GREATER symbol { $$ = expr_alloc_comp(E_GTH, $1, $3); }
| symbol T_GREATER_EQUAL symbol { $$ = expr_alloc_comp(E_GEQ, $1, $3); }
| symbol T_EQUAL symbol { $$ = expr_alloc_comp(E_EQUAL, $1, $3); }
| symbol T_UNEQUAL symbol { $$ = expr_alloc_comp(E_UNEQUAL, $1, $3); }
| T_OPEN_PAREN expr T_CLOSE_PAREN { $$ = $2; }
| T_NOT expr { $$ = expr_alloc_one(E_NOT, $2); }
| expr T_OR expr { $$ = expr_alloc_two(E_OR, $1, $3); }
| expr T_AND expr { $$ = expr_alloc_two(E_AND, $1, $3); }
;
/* For symbol definitions, selects, etc., where quotes are not accepted */
nonconst_symbol: T_WORD { $$ = sym_lookup($1, 0); free($1); };
symbol: nonconst_symbol
| T_WORD_QUOTE { $$ = sym_lookup($1, SYMBOL_CONST); free($1); }
;
word_opt: /* empty */ { $$ = NULL; }
| T_WORD
/* assignment statement */
assignment_stmt: T_WORD assign_op assign_val T_EOL { variable_add($1, $3, $2); free($1); free($3); }
assign_op:
T_EQUAL { $$ = VAR_RECURSIVE; }
| T_COLON_EQUAL { $$ = VAR_SIMPLE; }
| T_PLUS_EQUAL { $$ = VAR_APPEND; }
;
assign_val:
/* empty */ { $$ = xstrdup(""); };
| T_ASSIGN_VAL
;
%%
void conf_parse(const char *name)
{
struct symbol *sym;
int i;
zconf_initscan(name);
_menu_init();
if (getenv("ZCONF_DEBUG"))
yydebug = 1;
yyparse();
/* Variables are expanded in the parse phase. We can free them here. */
variable_all_del();
if (yynerrs)
exit(1);
if (!modules_sym)
modules_sym = sym_find( "n" );
if (!menu_has_prompt(&rootmenu)) {
current_entry = &rootmenu;
menu_add_prompt(P_MENU, "Main menu", NULL);
}
menu_finalize(&rootmenu);
for_all_symbols(i, sym) {
if (sym_check_deps(sym))
yynerrs++;
}
if (yynerrs)
exit(1);
sym_set_change_count(1);
}
static bool zconf_endtoken(const char *tokenname,
const char *expected_tokenname)
{
if (strcmp(tokenname, expected_tokenname)) {
zconf_error("unexpected '%s' within %s block",
tokenname, expected_tokenname);
yynerrs++;
return false;
}
if (current_menu->file != current_file) {
zconf_error("'%s' in different file than '%s'",
tokenname, expected_tokenname);
fprintf(stderr, "%s:%d: location of the '%s'\n",
current_menu->file->name, current_menu->lineno,
expected_tokenname);
yynerrs++;
return false;
}
return true;
}
static void zconfprint(const char *err, ...)
{
va_list ap;
fprintf(stderr, "%s:%d: ", zconf_curname(), zconf_lineno());
va_start(ap, err);
vfprintf(stderr, err, ap);
va_end(ap);
fprintf(stderr, "\n");
}
static void zconf_error(const char *err, ...)
{
va_list ap;
yynerrs++;
fprintf(stderr, "%s:%d: ", zconf_curname(), zconf_lineno());
va_start(ap, err);
vfprintf(stderr, err, ap);
va_end(ap);
fprintf(stderr, "\n");
}
static void yyerror(const char *err)
{
fprintf(stderr, "%s:%d: %s\n", zconf_curname(), zconf_lineno() + 1, err);
}
static void print_quoted_string(FILE *out, const char *str)
{
const char *p;
int len;
putc('"', out);
while ((p = strchr(str, '"'))) {
len = p - str;
if (len)
fprintf(out, "%.*s", len, str);
fputs("\\\"", out);
str = p + 1;
}
fputs(str, out);
putc('"', out);
}
static void print_symbol(FILE *out, struct menu *menu)
{
struct symbol *sym = menu->sym;
struct property *prop;
if (sym_is_choice(sym))
fprintf(out, "\nchoice\n");
else
fprintf(out, "\nconfig %s\n", sym->name);
switch (sym->type) {
case S_BOOLEAN:
fputs(" bool\n", out);
break;
case S_TRISTATE:
fputs(" tristate\n", out);
break;
case S_STRING:
fputs(" string\n", out);
break;
case S_INT:
fputs(" integer\n", out);
break;
case S_HEX:
fputs(" hex\n", out);
break;
default:
fputs(" ???\n", out);
break;
}
for (prop = sym->prop; prop; prop = prop->next) {
if (prop->menu != menu)
continue;
switch (prop->type) {
case P_PROMPT:
fputs(" prompt ", out);
print_quoted_string(out, prop->text);
if (!expr_is_yes(prop->visible.expr)) {
fputs(" if ", out);
expr_fprint(prop->visible.expr, out);
}
fputc('\n', out);
break;
case P_DEFAULT:
fputs( " default ", out);
expr_fprint(prop->expr, out);
if (!expr_is_yes(prop->visible.expr)) {
fputs(" if ", out);
expr_fprint(prop->visible.expr, out);
}
fputc('\n', out);
break;
case P_CHOICE:
fputs(" #choice value\n", out);
break;
case P_SELECT:
fputs( " select ", out);
expr_fprint(prop->expr, out);
fputc('\n', out);
break;
case P_IMPLY:
fputs( " imply ", out);
expr_fprint(prop->expr, out);
fputc('\n', out);
break;
case P_RANGE:
fputs( " range ", out);
expr_fprint(prop->expr, out);
fputc('\n', out);
break;
case P_MENU:
fputs( " menu ", out);
print_quoted_string(out, prop->text);
fputc('\n', out);
break;
case P_SYMBOL:
fputs( " symbol ", out);
fprintf(out, "%s\n", prop->menu->sym->name);
break;
default:
fprintf(out, " unknown prop %d!\n", prop->type);
break;
}
}
if (menu->help) {
int len = strlen(menu->help);
while (menu->help[--len] == '\n')
menu->help[len] = 0;
fprintf(out, " help\n%s\n", menu->help);
}
}
void zconfdump(FILE *out)
{
struct property *prop;
struct symbol *sym;
struct menu *menu;
menu = rootmenu.list;
while (menu) {
if ((sym = menu->sym))
print_symbol(out, menu);
else if ((prop = menu->prompt)) {
switch (prop->type) {
case P_COMMENT:
fputs("\ncomment ", out);
print_quoted_string(out, prop->text);
fputs("\n", out);
break;
case P_MENU:
fputs("\nmenu ", out);
print_quoted_string(out, prop->text);
fputs("\n", out);
break;
default:
;
}
if (!expr_is_yes(prop->visible.expr)) {
fputs(" depends ", out);
expr_fprint(prop->visible.expr, out);
fputc('\n', out);
}
}
if (menu->list)
menu = menu->list;
else if (menu->next)
menu = menu->next;
else while ((menu = menu->parent)) {
if (menu->prompt && menu->prompt->type == P_MENU)
fputs("\nendmenu\n", out);
if (menu->next) {
menu = menu->next;
break;
}
}
}
}
#include "menu.c"
Reference in New Issue View Git Blame Copy Permalink