// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2002 Roman Zippel <[email protected]>
*/
#include <sys/types.h>
#include <ctype.h>
#include <stdlib.h>
#include <string.h>
#include <regex.h>
#include <hash.h>
#include <xalloc.h>
#include "internal.h"
#include "lkc.h"
struct symbol symbol_yes = {
.name = "y",
.type = S_TRISTATE,
.curr = { "y", yes },
.menus = LIST_HEAD_INIT(symbol_yes.menus),
.flags = SYMBOL_CONST|SYMBOL_VALID,
};
struct symbol symbol_mod = {
.name = "m",
.type = S_TRISTATE,
.curr = { "m", mod },
.menus = LIST_HEAD_INIT(symbol_mod.menus),
.flags = SYMBOL_CONST|SYMBOL_VALID,
};
struct symbol symbol_no = {
.name = "n",
.type = S_TRISTATE,
.curr = { "n", no },
.menus = LIST_HEAD_INIT(symbol_no.menus),
.flags = SYMBOL_CONST|SYMBOL_VALID,
};
struct symbol *modules_sym;
static tristate modules_val;
static int sym_warnings;
enum symbol_type sym_get_type(const struct symbol *sym)
{
enum symbol_type type = sym->type;
if (type == S_TRISTATE && modules_val == no)
type = S_BOOLEAN;
return type;
}
const char *sym_type_name(enum symbol_type type)
{
switch (type) {
case S_BOOLEAN:
return "bool";
case S_TRISTATE:
return "tristate";
case S_INT:
return "integer";
case S_HEX:
return "hex";
case S_STRING:
return "string";
case S_UNKNOWN:
return "unknown";
}
return "???";
}
/**
* sym_get_choice_menu - get the parent choice menu if present
*
* @sym: a symbol pointer
*
* Return: a choice menu if this function is called against a choice member.
*/
struct menu *sym_get_choice_menu(const struct symbol *sym)
{
struct menu *menu = NULL;
struct menu *m;
/*
* Choice members must have a prompt. Find a menu entry with a prompt,
* and assume it resides inside a choice block.
*/
list_for_each_entry(m, &sym->menus, link)
if (m->prompt) {
menu = m;
break;
}
if (!menu)
return NULL;
do {
menu = menu->parent;
} while (menu && !menu->sym);
if (menu && menu->sym && sym_is_choice(menu->sym))
return menu;
return NULL;
}
static struct property *sym_get_default_prop(struct symbol *sym)
{
struct property *prop;
for_all_defaults(sym, prop) {
prop->visible.tri = expr_calc_value(prop->visible.expr);
if (prop->visible.tri != no)
return prop;
}
return NULL;
}
struct property *sym_get_range_prop(struct symbol *sym)
{
struct property *prop;
for_all_properties(sym, prop, P_RANGE) {
prop->visible.tri = expr_calc_value(prop->visible.expr);
if (prop->visible.tri != no)
return prop;
}
return NULL;
}
static long long sym_get_range_val(struct symbol *sym, int base)
{
sym_calc_value(sym);
switch (sym->type) {
case S_INT:
base = 10;
break;
case S_HEX:
base = 16;
break;
default:
break;
}
return strtoll(sym->curr.val, NULL, base);
}
static void sym_validate_range(struct symbol *sym)
{
struct property *prop;
struct symbol *range_sym;
int base;
long long val, val2;
switch (sym->type) {
case S_INT:
base = 10;
break;
case S_HEX:
base = 16;
break;
default:
return;
}
prop = sym_get_range_prop(sym);
if (!prop)
return;
val = strtoll(sym->curr.val, NULL, base);
range_sym = prop->expr->left.sym;
val2 = sym_get_range_val(range_sym, base);
if (val >= val2) {
range_sym = prop->expr->right.sym;
val2 = sym_get_range_val(range_sym, base);
if (val <= val2)
return;
}
sym->curr.val = range_sym->curr.val;
}
static void sym_set_changed(struct symbol *sym)
{
struct menu *menu;
list_for_each_entry(menu, &sym->menus, link)
menu->flags |= MENU_CHANGED;
}
static void sym_set_all_changed(void)
{
struct symbol *sym;
for_all_symbols(sym)
sym_set_changed(sym);
}
static void sym_calc_visibility(struct symbol *sym)
{
struct property *prop;
tristate tri;
/* any prompt visible? */
tri = no;
for_all_prompts(sym, prop) {
prop->visible.tri = expr_calc_value(prop->visible.expr);
tri = EXPR_OR(tri, prop->visible.tri);
}
if (tri == mod && (sym->type != S_TRISTATE || modules_val == no))
tri = yes;
if (sym->visible != tri) {
sym->visible = tri;
sym_set_changed(sym);
}
if (sym_is_choice_value(sym))
return;
/* defaulting to "yes" if no explicit "depends on" are given */
tri = yes;
if (sym->dir_dep.expr)
tri = expr_calc_value(sym->dir_dep.expr);
if (tri == mod && sym_get_type(sym) == S_BOOLEAN)
tri = yes;
if (sym->dir_dep.tri != tri) {
sym->dir_dep.tri = tri;
sym_set_changed(sym);
}
tri = no;
if (sym->rev_dep.expr)
tri = expr_calc_value(sym->rev_dep.expr);
if (tri == mod && sym_get_type(sym) == S_BOOLEAN)
tri = yes;
if (sym->rev_dep.tri != tri) {
sym->rev_dep.tri = tri;
sym_set_changed(sym);
}
tri = no;
if (sym->implied.expr)
tri = expr_calc_value(sym->implied.expr);
if (tri == mod && sym_get_type(sym) == S_BOOLEAN)
tri = yes;
if (sym->implied.tri != tri) {
sym->implied.tri = tri;
sym_set_changed(sym);
}
}
/*
* Find the default symbol for a choice.
* First try the default values for the choice symbol
* Next locate the first visible choice value
* Return NULL if none was found
*/
struct symbol *sym_choice_default(struct menu *choice)
{
struct menu *menu;
struct symbol *def_sym;
struct property *prop;
/* any of the defaults visible? */
for_all_defaults(choice->sym, prop) {
prop->visible.tri = expr_calc_value(prop->visible.expr);
if (prop->visible.tri == no)
continue;
def_sym = prop_get_symbol(prop);
if (def_sym->visible != no)
return def_sym;
}
/* just get the first visible value */
menu_for_each_sub_entry(menu, choice)
if (menu->sym && menu->sym->visible != no)
return menu->sym;
/* failed to locate any defaults */
return NULL;
}
/*
* sym_calc_choice - calculate symbol values in a choice
*
* @choice: a menu of the choice
*
* Return: a chosen symbol
*/
struct symbol *sym_calc_choice(struct menu *choice)
{
struct symbol *res = NULL;
struct symbol *sym;
struct menu *menu;
/* Traverse the list of choice members in the priority order. */
list_for_each_entry(sym, &choice->choice_members, choice_link) {
sym_calc_visibility(sym);
if (sym->visible == no)
continue;
/* The first visible symble with the user value 'y'. */
if (sym_has_value(sym) && sym->def[S_DEF_USER].tri == yes) {
res = sym;
break;
}
}
/*
* If 'y' is not found in the user input, use the default, unless it is
* explicitly set to 'n'.
*/
if (!res) {
res = sym_choice_default(choice);
if (res && sym_has_value(res) && res->def[S_DEF_USER].tri == no)
res = NULL;
}
/* Still not found. Pick up the first visible, user-unspecified symbol. */
if (!res) {
menu_for_each_sub_entry(menu, choice) {
sym = menu->sym;
if (!sym || sym->visible == no || sym_has_value(sym))
continue;
res = sym;
break;
}
}
/*
* Still not found. Traverse the linked list in the _reverse_ order to
* pick up the least prioritized 'n'.
*/
if (!res) {
list_for_each_entry_reverse(sym, &choice->choice_members,
choice_link) {
if (sym->visible == no)
continue;
res = sym;
break;
}
}
menu_for_each_sub_entry(menu, choice) {
tristate val;
sym = menu->sym;
if (!sym || sym->visible == no)
continue;
val = sym == res ? yes : no;
if (sym->curr.tri != val)
sym_set_changed(sym);
sym->curr.tri = val;
sym->flags |= SYMBOL_VALID | SYMBOL_WRITE;
}
return res;
}
static void sym_warn_unmet_dep(const struct symbol *sym)
{
struct gstr gs = str_new();
str_printf(&gs,
"\nWARNING: unmet direct dependencies detected for %s\n",
sym->name);
str_printf(&gs,
" Depends on [%c]: ",
sym->dir_dep.tri == mod ? 'm' : 'n');
expr_gstr_print(sym->dir_dep.expr, &gs);
str_printf(&gs, "\n");
expr_gstr_print_revdep(sym->rev_dep.expr, &gs, yes,
" Selected by [y]:\n");
expr_gstr_print_revdep(sym->rev_dep.expr, &gs, mod,
" Selected by [m]:\n");
fputs(str_get(&gs), stderr);
sym_warnings++;
}
bool sym_dep_errors(void)
{
if (sym_warnings)
return getenv("KCONFIG_WERROR");
return false;
}
void sym_calc_value(struct symbol *sym)
{
struct symbol_value newval, oldval;
struct property *prop;
struct menu *choice_menu;
if (!sym)
return;
if (sym->flags & SYMBOL_VALID)
return;
sym->flags |= SYMBOL_VALID;
oldval = sym->curr;
newval.tri = no;
switch (sym->type) {
case S_INT:
newval.val = "0";
break;
case S_HEX:
newval.val = "0x0";
break;
case S_STRING:
newval.val = "";
break;
case S_BOOLEAN:
case S_TRISTATE:
newval.val = "n";
break;
default:
sym->curr.val = sym->name;
sym->curr.tri = no;
return;
}
sym->flags &= ~SYMBOL_WRITE;
sym_calc_visibility(sym);
if (sym->visible != no)
sym->flags |= SYMBOL_WRITE;
/* set default if recursively called */
sym->curr = newval;
switch (sym_get_type(sym)) {
case S_BOOLEAN:
case S_TRISTATE:
choice_menu = sym_get_choice_menu(sym);
if (choice_menu) {
sym_calc_choice(choice_menu);
newval.tri = sym->curr.tri;
} else {
if (sym->visible != no) {
/* if the symbol is visible use the user value
* if available, otherwise try the default value
*/
if (sym_has_value(sym)) {
newval.tri = EXPR_AND(sym->def[S_DEF_USER].tri,
sym->visible);
goto calc_newval;
}
}
if (sym->rev_dep.tri != no)
sym->flags |= SYMBOL_WRITE;
if (!sym_is_choice(sym)) {
prop = sym_get_default_prop(sym);
if (prop) {
newval.tri = EXPR_AND(expr_calc_value(prop->expr),
prop->visible.tri);
if (newval.tri != no)
sym->flags |= SYMBOL_WRITE;
}
if (sym->implied.tri != no) {
sym->flags |= SYMBOL_WRITE;
newval.tri = EXPR_OR(newval.tri, sym->implied.tri);
newval.tri = EXPR_AND(newval.tri,
sym->dir_dep.tri);
}
}
calc_newval:
if (sym->dir_dep.tri < sym->rev_dep.tri)
sym_warn_unmet_dep(sym);
newval.tri = EXPR_OR(newval.tri, sym->rev_dep.tri);
}
if (newval.tri == mod && sym_get_type(sym) == S_BOOLEAN)
newval.tri = yes;
break;
case S_STRING:
case S_HEX:
case S_INT:
if (sym->visible != no && sym_has_value(sym)) {
newval.val = sym->def[S_DEF_USER].val;
break;
}
prop = sym_get_default_prop(sym);
if (prop) {
struct symbol *ds = prop_get_symbol(prop);
if (ds) {
sym->flags |= SYMBOL_WRITE;
sym_calc_value(ds);
newval.val = ds->curr.val;
}
}
break;
default:
;
}
sym->curr = newval;
sym_validate_range(sym);
if (memcmp(&oldval, &sym->curr, sizeof(oldval))) {
sym_set_changed(sym);
if (modules_sym == sym) {
sym_set_all_changed();
modules_val = modules_sym->curr.tri;
}
}
if (sym_is_choice(sym))
sym->flags &= ~SYMBOL_WRITE;
}
void sym_clear_all_valid(void)
{
struct symbol *sym;
for_all_symbols(sym)
sym->flags &= ~SYMBOL_VALID;
expr_invalidate_all();
conf_set_changed(true);
sym_calc_value(modules_sym);
}
bool sym_tristate_within_range(const struct symbol *sym, tristate val)
{
int type = sym_get_type(sym);
if (sym->visible == no)
return false;
if (type != S_BOOLEAN && type != S_TRISTATE)
return false;
if (type == S_BOOLEAN && val == mod)
return false;
if (sym->visible <= sym->rev_dep.tri)
return false;
return val >= sym->rev_dep.tri && val <= sym->visible;
}
bool sym_set_tristate_value(struct symbol *sym, tristate val)
{
tristate oldval = sym_get_tristate_value(sym);
if (!sym_tristate_within_range(sym, val))
return false;
if (!(sym->flags & SYMBOL_DEF_USER) || sym->def[S_DEF_USER].tri != val) {
sym->def[S_DEF_USER].tri = val;
sym->flags |= SYMBOL_DEF_USER;
sym_set_changed(sym);
}
if (oldval != val)
sym_clear_all_valid();
return true;
}
/**
* choice_set_value - set the user input to a choice
*
* @choice: menu entry for the choice
* @sym: selected symbol
*/
void choice_set_value(struct menu *choice, struct symbol *sym)
{
struct menu *menu;
bool changed = false;
menu_for_each_sub_entry(menu, choice) {
tristate val;
if (!menu->sym)
continue;
if (menu->sym->visible == no)
continue;
val = menu->sym == sym ? yes : no;
if (menu->sym->curr.tri != val)
changed = true;
menu->sym->def[S_DEF_USER].tri = val;
menu->sym->flags |= SYMBOL_DEF_USER;
/*
* Now, the user has explicitly enabled or disabled this symbol,
* it should be given the highest priority. We are possibly
* setting multiple symbols to 'n', where the first symbol is
* given the least prioritized 'n'. This works well when the
* choice block ends up with selecting 'n' symbol.
* (see sym_calc_choice())
*/
list_move(&menu->sym->choice_link, &choice->choice_members);
}
if (changed)
sym_clear_all_valid();
}
tristate sym_toggle_tristate_value(struct symbol *sym)
{
struct menu *choice;
tristate oldval, newval;
choice = sym_get_choice_menu(sym);
if (choice) {
choice_set_value(choice, sym);
return yes;
}
oldval = newval = sym_get_tristate_value(sym);
do {
switch (newval) {
case no:
newval = mod;
break;
case mod:
newval = yes;
break;
case yes:
newval = no;
break;
}
if (sym_set_tristate_value(sym, newval))
break;
} while (oldval != newval);
return newval;
}
bool sym_string_valid(struct symbol *sym, const char *str)
{
signed char ch;
switch (sym->type) {
case S_STRING:
return true;
case S_INT:
ch = *str++;
if (ch == '-')
ch = *str++;
if (!isdigit(ch))
return false;
if (ch == '0' && *str != 0)
return false;
while ((ch = *str++)) {
if (!isdigit(ch))
return false;
}
return true;
case S_HEX:
if (str[0] == '0' && (str[1] == 'x' || str[1] == 'X'))
str += 2;
ch = *str++;
do {
if (!isxdigit(ch))
return false;
} while ((ch = *str++));
return true;
case S_BOOLEAN:
case S_TRISTATE:
switch (str[0]) {
case 'y': case 'Y':
case 'm': case 'M':
case 'n': case 'N':
return true;
}
return false;
default:
return false;
}
}
bool sym_string_within_range(struct symbol *sym, const char *str)
{
struct property *prop;
long long val;
switch (sym->type) {
case S_STRING:
return sym_string_valid(sym, str);
case S_INT:
if (!sym_string_valid(sym, str))
return false;
prop = sym_get_range_prop(sym);
if (!prop)
return true;
val = strtoll(str, NULL, 10);
return val >= sym_get_range_val(prop->expr->left.sym, 10) &&
val <= sym_get_range_val(prop->expr->right.sym, 10);
case S_HEX:
if (!sym_string_valid(sym, str))
return false;
prop = sym_get_range_prop(sym);
if (!prop)
return true;
val = strtoll(str, NULL, 16);
return val >= sym_get_range_val(prop->expr->left.sym, 16) &&
val <= sym_get_range_val(prop->expr->right.sym, 16);
case S_BOOLEAN:
case S_TRISTATE:
switch (str[0]) {
case 'y': case 'Y':
return sym_tristate_within_range(sym, yes);
case 'm': case 'M':
return sym_tristate_within_range(sym, mod);
case 'n': case 'N':
return sym_tristate_within_range(sym, no);
}
return false;
default:
return false;
}
}
bool sym_set_string_value(struct symbol *sym, const char *newval)
{
const char *oldval;
char *val;
int size;
switch (sym->type) {
case S_BOOLEAN:
case S_TRISTATE:
switch (newval[0]) {
case 'y': case 'Y':
return sym_set_tristate_value(sym, yes);
case 'm': case 'M':
return sym_set_tristate_value(sym, mod);
case 'n': case 'N':
return sym_set_tristate_value(sym, no);
}
return false;
default:
;
}
if (!sym_string_within_range(sym, newval))
return false;
if (!(sym->flags & SYMBOL_DEF_USER)) {
sym->flags |= SYMBOL_DEF_USER;
sym_set_changed(sym);
}
oldval = sym->def[S_DEF_USER].val;
size = strlen(newval) + 1;
if (sym->type == S_HEX && (newval[0] != '0' || (newval[1] != 'x' && newval[1] != 'X'))) {
size += 2;
sym->def[S_DEF_USER].val = val = xmalloc(size);
*val++ = '0';
*val++ = 'x';
} else if (!oldval || strcmp(oldval, newval))
sym->def[S_DEF_USER].val = val = xmalloc(size);
else
return true;
strcpy(val, newval);
free((void *)oldval);
sym_clear_all_valid();
return true;
}
/*
* Find the default value associated to a symbol.
* For tristate symbol handle the modules=n case
* in which case "m" becomes "y".
* If the symbol does not have any default then fallback
* to the fixed default values.
*/
const char *sym_get_string_default(struct symbol *sym)
{
struct property *prop;
struct symbol *ds;
const char *str = "";
tristate val;
sym_calc_visibility(sym);
sym_calc_value(modules_sym);
val = symbol_no.curr.tri;
/* If symbol has a default value look it up */
prop = sym_get_default_prop(sym);
if (prop != NULL) {
switch (sym->type) {
case S_BOOLEAN:
case S_TRISTATE:
/* The visibility may limit the value from yes => mod */
val = EXPR_AND(expr_calc_value(prop->expr), prop->visible.tri);
break;
default:
/*
* The following fails to handle the situation
* where a default value is further limited by
* the valid range.
*/
ds = prop_get_symbol(prop);
if (ds != NULL) {
sym_calc_value(ds);
str = (const char *)ds->curr.val;
}
}
}
/* Handle select statements */
val = EXPR_OR(val, sym->rev_dep.tri);
/* transpose mod to yes if modules are not enabled */
if (val == mod)
if (!sym_is_choice_value(sym) && modules_sym->curr.tri == no)
val = yes;
/* transpose mod to yes if type is bool */
if (sym->type == S_BOOLEAN && val == mod)
val = yes;
/* adjust the default value if this symbol is implied by another */
if (val < sym->implied.tri)
val = sym->implied.tri;
switch (sym->type) {
case S_BOOLEAN:
case S_TRISTATE:
switch (val) {
case no: return "n";
case mod: return "m";
case yes: return "y";
}
case S_INT:
if (!str[0])
str = "0";
break;
case S_HEX:
if (!str[0])
str = "0x0";
break;
default:
break;
}
return str;
}
const char *sym_get_string_value(struct symbol *sym)
{
tristate val;
switch (sym->type) {
case S_BOOLEAN:
case S_TRISTATE:
val = sym_get_tristate_value(sym);
switch (val) {
case no:
return "n";
case mod:
return "m";
case yes:
return "y";
}
break;
default:
;
}
return (const char *)sym->curr.val;
}
bool sym_is_changeable(const struct symbol *sym)
{
return !sym_is_choice(sym) && sym->visible > sym->rev_dep.tri;
}
bool sym_is_choice_value(const struct symbol *sym)
{
return !list_empty(&sym->choice_link);
}
HASHTABLE_DEFINE(sym_hashtable, SYMBOL_HASHSIZE);
struct symbol *sym_lookup(const char *name, int flags)
{
struct symbol *symbol;
char *new_name;
int hash;
if (name) {
if (name[0] && !name[1]) {
switch (name[0]) {
case 'y': return &symbol_yes;
case 'm': return &symbol_mod;
case 'n': return &symbol_no;
}
}
hash = hash_str(name);
hash_for_each_possible(sym_hashtable, symbol, node, hash) {
if (symbol->name &&
!strcmp(symbol->name, name) &&
(flags ? symbol->flags & flags
: !(symbol->flags & SYMBOL_CONST)))
return symbol;
}
new_name = xstrdup(name);
} else {
new_name = NULL;
hash = 0;
}
symbol = xmalloc(sizeof(*symbol));
memset(symbol, 0, sizeof(*symbol));
symbol->name = new_name;
symbol->type = S_UNKNOWN;
symbol->flags = flags;
INIT_LIST_HEAD(&symbol->menus);
INIT_LIST_HEAD(&symbol->choice_link);
hash_add(sym_hashtable, &symbol->node, hash);
return symbol;
}
struct symbol *sym_find(const char *name)
{
struct symbol *symbol = NULL;
int hash = 0;
if (!name)
return NULL;
if (name[0] && !name[1]) {
switch (name[0]) {
case 'y': return &symbol_yes;
case 'm': return &symbol_mod;
case 'n': return &symbol_no;
}
}
hash = hash_str(name);
hash_for_each_possible(sym_hashtable, symbol, node, hash) {
if (symbol->name &&
!strcmp(symbol->name, name) &&
!(symbol->flags & SYMBOL_CONST))
break;
}
return symbol;
}
struct sym_match {
struct symbol *sym;
off_t so, eo;
};
/* Compare matched symbols as thus:
* - first, symbols that match exactly
* - then, alphabetical sort
*/
static int sym_rel_comp(const void *sym1, const void *sym2)
{
const struct sym_match *s1 = sym1;
const struct sym_match *s2 = sym2;
int exact1, exact2;
/* Exact match:
* - if matched length on symbol s1 is the length of that symbol,
* then this symbol should come first;
* - if matched length on symbol s2 is the length of that symbol,
* then this symbol should come first.
* Note: since the search can be a regexp, both symbols may match
* exactly; if this is the case, we can't decide which comes first,
* and we fallback to sorting alphabetically.
*/
exact1 = (s1->eo - s1->so) == strlen(s1->sym->name);
exact2 = (s2->eo - s2->so) == strlen(s2->sym->name);
if (exact1 && !exact2)
return -1;
if (!exact1 && exact2)
return 1;
/* As a fallback, sort symbols alphabetically */
return strcmp(s1->sym->name, s2->sym->name);
}
struct symbol **sym_re_search(const char *pattern)
{
struct symbol *sym, **sym_arr = NULL;
struct sym_match *sym_match_arr = NULL;
int i, cnt, size;
regex_t re;
regmatch_t match[1];
cnt = size = 0;
/* Skip if empty */
if (strlen(pattern) == 0)
return NULL;
if (regcomp(&re, pattern, REG_EXTENDED|REG_ICASE))
return NULL;
for_all_symbols(sym) {
if (sym->flags & SYMBOL_CONST || !sym->name)
continue;
if (regexec(&re, sym->name, 1, match, 0))
continue;
if (cnt >= size) {
void *tmp;
size += 16;
tmp = realloc(sym_match_arr, size * sizeof(struct sym_match));
if (!tmp)
goto sym_re_search_free;
sym_match_arr = tmp;
}
sym_calc_value(sym);
/* As regexec returned 0, we know we have a match, so
* we can use match[0].rm_[se]o without further checks
*/
sym_match_arr[cnt].so = match[0].rm_so;
sym_match_arr[cnt].eo = match[0].rm_eo;
sym_match_arr[cnt++].sym = sym;
}
if (sym_match_arr) {
qsort(sym_match_arr, cnt, sizeof(struct sym_match), sym_rel_comp);
sym_arr = malloc((cnt+1) * sizeof(struct symbol *));
if (!sym_arr)
goto sym_re_search_free;
for (i = 0; i < cnt; i++)
sym_arr[i] = sym_match_arr[i].sym;
sym_arr[cnt] = NULL;
}
sym_re_search_free:
/* sym_match_arr can be NULL if no match, but free(NULL) is OK */
free(sym_match_arr);
regfree(&re);
return sym_arr;
}
/*
* When we check for recursive dependencies we use a stack to save
* current state so we can print out relevant info to user.
* The entries are located on the call stack so no need to free memory.
* Note insert() remove() must always match to properly clear the stack.
*/
static struct dep_stack {
struct dep_stack *prev, *next;
struct symbol *sym;
struct property *prop;
struct expr **expr;
} *check_top;
static void dep_stack_insert(struct dep_stack *stack, struct symbol *sym)
{
memset(stack, 0, sizeof(*stack));
if (check_top)
check_top->next = stack;
stack->prev = check_top;
stack->sym = sym;
check_top = stack;
}
static void dep_stack_remove(void)
{
check_top = check_top->prev;
if (check_top)
check_top->next = NULL;
}
/*
* Called when we have detected a recursive dependency.
* check_top point to the top of the stact so we use
* the ->prev pointer to locate the bottom of the stack.
*/
static void sym_check_print_recursive(struct symbol *last_sym)
{
struct dep_stack *stack;
struct symbol *sym, *next_sym;
struct menu *choice;
struct dep_stack cv_stack;
enum prop_type type;
choice = sym_get_choice_menu(last_sym);
if (choice) {
dep_stack_insert(&cv_stack, last_sym);
last_sym = choice->sym;
}
for (stack = check_top; stack != NULL; stack = stack->prev)
if (stack->sym == last_sym)
break;
if (!stack) {
fprintf(stderr, "unexpected recursive dependency error\n");
return;
}
for (; stack; stack = stack->next) {
sym = stack->sym;
next_sym = stack->next ? stack->next->sym : last_sym;
type = stack->prop ? stack->prop->type : P_UNKNOWN;
if (stack->sym == last_sym)
fprintf(stderr, "error: recursive dependency detected!\n");
if (sym_is_choice(next_sym)) {
choice = list_first_entry(&next_sym->menus, struct menu, link);
fprintf(stderr, "\tsymbol %s is part of choice block at %s:%d\n",
sym->name ? sym->name : "<choice>",
choice->filename, choice->lineno);
} else if (stack->expr == &sym->dir_dep.expr) {
fprintf(stderr, "\tsymbol %s depends on %s\n",
sym->name ? sym->name : "<choice>",
next_sym->name);
} else if (stack->expr == &sym->rev_dep.expr) {
fprintf(stderr, "\tsymbol %s is selected by %s\n",
sym->name, next_sym->name);
} else if (stack->expr == &sym->implied.expr) {
fprintf(stderr, "\tsymbol %s is implied by %s\n",
sym->name, next_sym->name);
} else if (stack->expr) {
fprintf(stderr, "\tsymbol %s %s value contains %s\n",
sym->name ? sym->name : "<choice>",
prop_get_type_name(type),
next_sym->name);
} else {
fprintf(stderr, "\tsymbol %s %s is visible depending on %s\n",
sym->name ? sym->name : "<choice>",
prop_get_type_name(type),
next_sym->name);
}
}
fprintf(stderr,
"For a resolution refer to Documentation/kbuild/kconfig-language.rst\n"
"subsection \"Kconfig recursive dependency limitations\"\n"
"\n");
if (check_top == &cv_stack)
dep_stack_remove();
}
static struct symbol *sym_check_expr_deps(const struct expr *e)
{
struct symbol *sym;
if (!e)
return NULL;
switch (e->type) {
case E_OR:
case E_AND:
sym = sym_check_expr_deps(e->left.expr);
if (sym)
return sym;
return sym_check_expr_deps(e->right.expr);
case E_NOT:
return sym_check_expr_deps(e->left.expr);
case E_EQUAL:
case E_GEQ:
case E_GTH:
case E_LEQ:
case E_LTH:
case E_UNEQUAL:
sym = sym_check_deps(e->left.sym);
if (sym)
return sym;
return sym_check_deps(e->right.sym);
case E_SYMBOL:
return sym_check_deps(e->left.sym);
default:
break;
}
fprintf(stderr, "Oops! How to check %d?\n", e->type);
return NULL;
}
/* return NULL when dependencies are OK */
static struct symbol *sym_check_sym_deps(struct symbol *sym)
{
struct symbol *sym2;
struct property *prop;
struct dep_stack stack;
dep_stack_insert(&stack, sym);
stack.expr = &sym->dir_dep.expr;
sym2 = sym_check_expr_deps(sym->dir_dep.expr);
if (sym2)
goto out;
stack.expr = &sym->rev_dep.expr;
sym2 = sym_check_expr_deps(sym->rev_dep.expr);
if (sym2)
goto out;
stack.expr = &sym->implied.expr;
sym2 = sym_check_expr_deps(sym->implied.expr);
if (sym2)
goto out;
stack.expr = NULL;
for (prop = sym->prop; prop; prop = prop->next) {
if (prop->type == P_SELECT || prop->type == P_IMPLY)
continue;
stack.prop = prop;
sym2 = sym_check_expr_deps(prop->visible.expr);
if (sym2)
break;
if (prop->type != P_DEFAULT || sym_is_choice(sym))
continue;
stack.expr = &prop->expr;
sym2 = sym_check_expr_deps(prop->expr);
if (sym2)
break;
stack.expr = NULL;
}
out:
dep_stack_remove();
return sym2;
}
static struct symbol *sym_check_choice_deps(struct symbol *choice)
{
struct menu *choice_menu, *menu;
struct symbol *sym2;
struct dep_stack stack;
dep_stack_insert(&stack, choice);
choice_menu = list_first_entry(&choice->menus, struct menu, link);
menu_for_each_sub_entry(menu, choice_menu) {
if (menu->sym)
menu->sym->flags |= SYMBOL_CHECK | SYMBOL_CHECKED;
}
choice->flags |= (SYMBOL_CHECK | SYMBOL_CHECKED);
sym2 = sym_check_sym_deps(choice);
choice->flags &= ~SYMBOL_CHECK;
if (sym2)
goto out;
menu_for_each_sub_entry(menu, choice_menu) {
if (!menu->sym)
continue;
sym2 = sym_check_sym_deps(menu->sym);
if (sym2)
break;
}
out:
menu_for_each_sub_entry(menu, choice_menu)
if (menu->sym)
menu->sym->flags &= ~SYMBOL_CHECK;
if (sym2) {
struct menu *choice_menu2;
choice_menu2 = sym_get_choice_menu(sym2);
if (choice_menu2 == choice_menu)
sym2 = choice;
}
dep_stack_remove();
return sym2;
}
struct symbol *sym_check_deps(struct symbol *sym)
{
struct menu *choice;
struct symbol *sym2;
if (sym->flags & SYMBOL_CHECK) {
sym_check_print_recursive(sym);
return sym;
}
if (sym->flags & SYMBOL_CHECKED)
return NULL;
choice = sym_get_choice_menu(sym);
if (choice) {
struct dep_stack stack;
/* for choice groups start the check with main choice symbol */
dep_stack_insert(&stack, sym);
sym2 = sym_check_deps(choice->sym);
dep_stack_remove();
} else if (sym_is_choice(sym)) {
sym2 = sym_check_choice_deps(sym);
} else {
sym->flags |= (SYMBOL_CHECK | SYMBOL_CHECKED);
sym2 = sym_check_sym_deps(sym);
sym->flags &= ~SYMBOL_CHECK;
}
return sym2;
}
struct symbol *prop_get_symbol(const struct property *prop)
{
if (prop->expr && prop->expr->type == E_SYMBOL)
return prop->expr->left.sym;
return NULL;
}
const char *prop_get_type_name(enum prop_type type)
{
switch (type) {
case P_PROMPT:
return "prompt";
case P_COMMENT:
return "comment";
case P_MENU:
return "menu";
case P_DEFAULT:
return "default";
case P_SELECT:
return "select";
case P_IMPLY:
return "imply";
case P_RANGE:
return "range";
case P_UNKNOWN:
break;
}
return "unknown";
}
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