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fixdep: refactor hash table lookup

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Change the hash table code so it will be easier to add the second table.

Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Reviewed-by: Miguel Ojeda <ojeda@kernel.org>
Tested-by: Miguel Ojeda <ojeda@kernel.org>
This commit is contained in:
Masahiro Yamada
2023-01-07 18:18:18 +09:00
parent 2185242fad
commit 871d657385
1 changed files with 25 additions and 22 deletions
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47
scripts/basic/fixdep.c
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@@ -113,7 +113,7 @@ struct item {
}; };
#define HASHSZ 256 #define HASHSZ 256
static struct item *hashtab[HASHSZ]; static struct item *config_hashtab[HASHSZ];
static unsigned int strhash(const char *str, unsigned int sz) static unsigned int strhash(const char *str, unsigned int sz)
{ {
@@ -125,25 +125,11 @@ static unsigned int strhash(const char *str, unsigned int sz)
return hash; return hash;
} }
/*
* Lookup a value in the configuration string.
*/
static int is_defined_config(const char *name, int len, unsigned int hash)
{
struct item *aux;
for (aux = hashtab[hash % HASHSZ]; aux; aux = aux->next) {
if (aux->hash == hash && aux->len == len &&
memcmp(aux->name, name, len) == 0)
return 1;
}
return 0;
}
/* /*
* Add a new value to the configuration string. * Add a new value to the configuration string.
*/ */
static void define_config(const char *name, int len, unsigned int hash) static void add_to_hashtable(const char *name, int len, unsigned int hash,
struct item *hashtab[])
{ {
struct item *aux = malloc(sizeof(*aux) + len); struct item *aux = malloc(sizeof(*aux) + len);
@@ -158,17 +144,34 @@ static void define_config(const char *name, int len, unsigned int hash)
hashtab[hash % HASHSZ] = aux; hashtab[hash % HASHSZ] = aux;
} }
/*
* Lookup a string in the hash table. If found, just return true.
* If not, add it to the hashtable and return false.
*/
static bool in_hashtable(const char *name, int len, struct item *hashtab[])
{
struct item *aux;
unsigned int hash = strhash(name, len);
for (aux = hashtab[hash % HASHSZ]; aux; aux = aux->next) {
if (aux->hash == hash && aux->len == len &&
memcmp(aux->name, name, len) == 0)
return true;
}
add_to_hashtable(name, len, hash, hashtab);
return false;
}
/* /*
* Record the use of a CONFIG_* word. * Record the use of a CONFIG_* word.
*/ */
static void use_config(const char *m, int slen) static void use_config(const char *m, int slen)
{ {
unsigned int hash = strhash(m, slen); if (in_hashtable(m, slen, config_hashtab))
return;
if (is_defined_config(m, slen, hash))
return;
define_config(m, slen, hash);
/* Print out a dependency path from a symbol name. */ /* Print out a dependency path from a symbol name. */
printf(" $(wildcard include/config/%.*s) \\\n", slen, m); printf(" $(wildcard include/config/%.*s) \\\n", slen, m);
} }