From 754c677b0bbf3ea6c7d2a73c93848f1b0d68c91e Mon Sep 17 00:00:00 2001 From: Rusty Russell Date: Mon, 20 Jun 2011 16:54:15 +0930 Subject: lib: import ccan modules for tdb2 Imported from git://git.ozlabs.org/~ccan/ccan init-1161-g661d41f Signed-off-by: Rusty Russell --- lib/ccan/htable/LICENSE | 339 ++++++++++++++++++++++++++++++++++++ lib/ccan/htable/_info | 115 ++++++++++++ lib/ccan/htable/htable.c | 290 +++++++++++++++++++++++++++++++ lib/ccan/htable/htable.h | 138 +++++++++++++++ lib/ccan/htable/htable_type.h | 97 +++++++++++ lib/ccan/htable/test/run-type.c | 176 +++++++++++++++++++ lib/ccan/htable/test/run.c | 176 +++++++++++++++++++ lib/ccan/htable/tools/Makefile | 5 + lib/ccan/htable/tools/speed.c | 377 ++++++++++++++++++++++++++++++++++++++++ 9 files changed, 1713 insertions(+) create mode 100644 lib/ccan/htable/LICENSE create mode 100644 lib/ccan/htable/_info create mode 100644 lib/ccan/htable/htable.c create mode 100644 lib/ccan/htable/htable.h create mode 100644 lib/ccan/htable/htable_type.h create mode 100644 lib/ccan/htable/test/run-type.c create mode 100644 lib/ccan/htable/test/run.c create mode 100644 lib/ccan/htable/tools/Makefile create mode 100644 lib/ccan/htable/tools/speed.c (limited to 'lib/ccan/htable') diff --git a/lib/ccan/htable/LICENSE b/lib/ccan/htable/LICENSE new file mode 100644 index 0000000000..d511905c16 --- /dev/null +++ b/lib/ccan/htable/LICENSE @@ -0,0 +1,339 @@ + GNU GENERAL PUBLIC LICENSE + Version 2, June 1991 + + Copyright (C) 1989, 1991 Free Software Foundation, Inc., + 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + Everyone is permitted to copy and distribute verbatim copies + of this license document, but changing it is not allowed. + + Preamble + + The licenses for most software are designed to take away your +freedom to share and change it. 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If this is what you want to do, use the GNU Lesser General +Public License instead of this License. diff --git a/lib/ccan/htable/_info b/lib/ccan/htable/_info new file mode 100644 index 0000000000..8dabe46a50 --- /dev/null +++ b/lib/ccan/htable/_info @@ -0,0 +1,115 @@ +#include +#include + +/** + * htable - hash table routines + * + * A hash table is an efficient structure for looking up keys. This version + * grows with usage and allows efficient deletion. + * + * Example: + * #include + * #include + * #include + * #include + * #include + * + * struct name_to_digit { + * const char *name; + * unsigned int val; + * }; + * + * static struct name_to_digit map[] = { + * { "zero", 0}, + * { "one", 1 }, + * { "two", 2 }, + * { "three", 3 }, + * { "four", 4 }, + * { "five", 5 }, + * { "six", 6 }, + * { "seven", 7 }, + * { "eight", 8 }, + * { "nine", 9 } + * }; + * + * // Wrapper for rehash function pointer. + * static size_t rehash(const void *e, void *unused) + * { + * return hash_string(((struct name_to_digit *)e)->name); + * } + * + * // Comparison function. + * static bool streq(const void *e, void *string) + * { + * return strcmp(((struct name_to_digit *)e)->name, string) == 0; + * } + * + * // We let them add their own aliases, eg. --alias=v=5 + * static void add_alias(struct htable *ht, const char *alias) + * { + * char *eq; + * struct name_to_digit *n; + * + * n = malloc(sizeof(*n)); + * n->name = strdup(alias); + * + * eq = strchr(n->name, '='); + * if (!eq || ((n->val = atoi(eq+1)) == 0 && !strcmp(eq+1, "0"))) + * errx(1, "Usage: --alias=="); + * *eq = '\0'; + * htable_add(ht, hash_string(n->name), n); + * } + * + * int main(int argc, char *argv[]) + * { + * struct htable *ht; + * unsigned int i; + * unsigned long val; + * + * if (argc < 2) + * errx(1, "Usage: %s [--alias==]... ...", + * argv[0]); + * + * // Create and populate hash table. + * ht = htable_new(rehash, NULL); + * for (i = 0; i < sizeof(map)/sizeof(map[0]); i++) + * htable_add(ht, hash_string(map[i].name), &map[i]); + * + * // Add any aliases to the hash table. + * for (i = 1; i < argc; i++) { + * if (!strncmp(argv[i], "--alias=", strlen("--alias="))) + * add_alias(ht, argv[i] + strlen("--alias=")); + * else + * break; + * } + * + * // Find the other args in the hash table. + * for (val = 0; i < argc; i++) { + * struct name_to_digit *n; + * n = htable_get(ht, hash_string(argv[i]), + * streq, argv[i]); + * if (!n) + * errx(1, "Invalid digit name %s", argv[i]); + * // Append it to the value we are building up. + * val *= 10; + * val += n->val; + * } + * printf("%lu\n", val); + * return 0; + * } + * + * License: GPLv2 (or later) + * Author: Rusty Russell + */ +int main(int argc, char *argv[]) +{ + if (argc != 2) + return 1; + + if (strcmp(argv[1], "depends") == 0) { + printf("ccan/compiler\n"); + return 0; + } + + return 1; +} diff --git a/lib/ccan/htable/htable.c b/lib/ccan/htable/htable.c new file mode 100644 index 0000000000..a15c54d795 --- /dev/null +++ b/lib/ccan/htable/htable.c @@ -0,0 +1,290 @@ +#include +#include +#include +#include +#include +#include +#include + +/* This means a struct htable takes at least 512 bytes / 1k (32/64 bits). */ +#define HTABLE_BASE_BITS 7 + +/* We use 0x1 as deleted marker. */ +#define HTABLE_DELETED (0x1) + +struct htable { + size_t (*rehash)(const void *elem, void *priv); + void *priv; + unsigned int bits; + size_t elems, deleted, max, max_with_deleted; + /* These are the bits which are the same in all pointers. */ + uintptr_t common_mask, common_bits; + uintptr_t perfect_bit; + uintptr_t *table; +}; + +/* We clear out the bits which are always the same, and put metadata there. */ +static inline uintptr_t get_extra_ptr_bits(const struct htable *ht, + uintptr_t e) +{ + return e & ht->common_mask; +} + +static inline void *get_raw_ptr(const struct htable *ht, uintptr_t e) +{ + return (void *)((e & ~ht->common_mask) | ht->common_bits); +} + +static inline uintptr_t make_hval(const struct htable *ht, + const void *p, uintptr_t bits) +{ + return ((uintptr_t)p & ~ht->common_mask) | bits; +} + +static inline bool entry_is_valid(uintptr_t e) +{ + return e > HTABLE_DELETED; +} + +static inline uintptr_t get_hash_ptr_bits(const struct htable *ht, + size_t hash) +{ + /* Shuffling the extra bits (as specified in mask) down the + * end is quite expensive. But the lower bits are redundant, so + * we fold the value first. */ + return (hash ^ (hash >> ht->bits)) + & ht->common_mask & ~ht->perfect_bit; +} + +struct htable *htable_new(size_t (*rehash)(const void *elem, void *priv), + void *priv) +{ + struct htable *ht = malloc(sizeof(struct htable)); + if (ht) { + ht->bits = HTABLE_BASE_BITS; + ht->rehash = rehash; + ht->priv = priv; + ht->elems = 0; + ht->deleted = 0; + ht->max = ((size_t)1 << ht->bits) * 3 / 4; + ht->max_with_deleted = ((size_t)1 << ht->bits) * 9 / 10; + /* This guarantees we enter update_common first add. */ + ht->common_mask = -1; + ht->common_bits = 0; + ht->perfect_bit = 0; + ht->table = calloc(1 << ht->bits, sizeof(uintptr_t)); + if (!ht->table) { + free(ht); + ht = NULL; + } + } + return ht; +} + +void htable_free(const struct htable *ht) +{ + free((void *)ht->table); + free((void *)ht); +} + +static size_t hash_bucket(const struct htable *ht, size_t h) +{ + return h & ((1 << ht->bits)-1); +} + +static void *htable_val(const struct htable *ht, + struct htable_iter *i, size_t hash, uintptr_t perfect) +{ + uintptr_t h2 = get_hash_ptr_bits(ht, hash) | perfect; + + while (ht->table[i->off]) { + if (ht->table[i->off] != HTABLE_DELETED) { + if (get_extra_ptr_bits(ht, ht->table[i->off]) == h2) + return get_raw_ptr(ht, ht->table[i->off]); + } + i->off = (i->off + 1) & ((1 << ht->bits)-1); + h2 &= ~perfect; + } + return NULL; +} + +void *htable_firstval(const struct htable *ht, + struct htable_iter *i, size_t hash) +{ + i->off = hash_bucket(ht, hash); + return htable_val(ht, i, hash, ht->perfect_bit); +} + +void *htable_nextval(const struct htable *ht, + struct htable_iter *i, size_t hash) +{ + i->off = (i->off + 1) & ((1 << ht->bits)-1); + return htable_val(ht, i, hash, 0); +} + +void *htable_first(const struct htable *ht, struct htable_iter *i) +{ + for (i->off = 0; i->off < (size_t)1 << ht->bits; i->off++) { + if (entry_is_valid(ht->table[i->off])) + return get_raw_ptr(ht, ht->table[i->off]); + } + return NULL; +} + +void *htable_next(const struct htable *ht, struct htable_iter *i) +{ + for (i->off++; i->off < (size_t)1 << ht->bits; i->off++) { + if (entry_is_valid(ht->table[i->off])) + return get_raw_ptr(ht, ht->table[i->off]); + } + return NULL; +} + +/* This does not expand the hash table, that's up to caller. */ +static void ht_add(struct htable *ht, const void *new, size_t h) +{ + size_t i; + uintptr_t perfect = ht->perfect_bit; + + i = hash_bucket(ht, h); + + while (entry_is_valid(ht->table[i])) { + perfect = 0; + i = (i + 1) & ((1 << ht->bits)-1); + } + ht->table[i] = make_hval(ht, new, get_hash_ptr_bits(ht, h)|perfect); +} + +static COLD bool double_table(struct htable *ht) +{ + unsigned int i; + size_t oldnum = (size_t)1 << ht->bits; + uintptr_t *oldtable, e; + + oldtable = ht->table; + ht->table = calloc(1 << (ht->bits+1), sizeof(size_t)); + if (!ht->table) { + ht->table = oldtable; + return false; + } + ht->bits++; + ht->max *= 2; + ht->max_with_deleted *= 2; + + /* If we lost our "perfect bit", get it back now. */ + if (!ht->perfect_bit && ht->common_mask) { + for (i = 0; i < sizeof(ht->common_mask) * CHAR_BIT; i++) { + if (ht->common_mask & ((size_t)1 << i)) { + ht->perfect_bit = (size_t)1 << i; + break; + } + } + } + + for (i = 0; i < oldnum; i++) { + if (entry_is_valid(e = oldtable[i])) { + void *p = get_raw_ptr(ht, e); + ht_add(ht, p, ht->rehash(p, ht->priv)); + } + } + ht->deleted = 0; + free(oldtable); + return true; +} + +static COLD void rehash_table(struct htable *ht) +{ + size_t start, i; + uintptr_t e; + + /* Beware wrap cases: we need to start from first empty bucket. */ + for (start = 0; ht->table[start]; start++); + + for (i = 0; i < (size_t)1 << ht->bits; i++) { + size_t h = (i + start) & ((1 << ht->bits)-1); + e = ht->table[h]; + if (!e) + continue; + if (e == HTABLE_DELETED) + ht->table[h] = 0; + else if (!(e & ht->perfect_bit)) { + void *p = get_raw_ptr(ht, e); + ht->table[h] = 0; + ht_add(ht, p, ht->rehash(p, ht->priv)); + } + } + ht->deleted = 0; +} + +/* We stole some bits, now we need to put them back... */ +static COLD void update_common(struct htable *ht, const void *p) +{ + unsigned int i; + uintptr_t maskdiff, bitsdiff; + + if (ht->elems == 0) { + ht->common_mask = -1; + ht->common_bits = (uintptr_t)p; + ht->perfect_bit = 1; + return; + } + + /* Find bits which are unequal to old common set. */ + maskdiff = ht->common_bits ^ ((uintptr_t)p & ht->common_mask); + + /* These are the bits which go there in existing entries. */ + bitsdiff = ht->common_bits & maskdiff; + + for (i = 0; i < (size_t)1 << ht->bits; i++) { + if (!entry_is_valid(ht->table[i])) + continue; + /* Clear the bits no longer in the mask, set them as + * expected. */ + ht->table[i] &= ~maskdiff; + ht->table[i] |= bitsdiff; + } + + /* Take away those bits from our mask, bits and perfect bit. */ + ht->common_mask &= ~maskdiff; + ht->common_bits &= ~maskdiff; + ht->perfect_bit &= ~maskdiff; +} + +bool htable_add(struct htable *ht, size_t hash, const void *p) +{ + if (ht->elems+1 > ht->max && !double_table(ht)) + return false; + if (ht->elems+1 + ht->deleted > ht->max_with_deleted) + rehash_table(ht); + assert(p); + if (((uintptr_t)p & ht->common_mask) != ht->common_bits) + update_common(ht, p); + + ht_add(ht, p, hash); + ht->elems++; + return true; +} + +bool htable_del(struct htable *ht, size_t h, const void *p) +{ + struct htable_iter i; + void *c; + + for (c = htable_firstval(ht,&i,h); c; c = htable_nextval(ht,&i,h)) { + if (c == p) { + htable_delval(ht, &i); + return true; + } + } + return false; +} + +void htable_delval(struct htable *ht, struct htable_iter *i) +{ + assert(i->off < (size_t)1 << ht->bits); + assert(entry_is_valid(ht->table[i->off])); + + ht->elems--; + ht->table[i->off] = HTABLE_DELETED; + ht->deleted++; +} diff --git a/lib/ccan/htable/htable.h b/lib/ccan/htable/htable.h new file mode 100644 index 0000000000..b68442972c --- /dev/null +++ b/lib/ccan/htable/htable.h @@ -0,0 +1,138 @@ +#ifndef CCAN_HTABLE_H +#define CCAN_HTABLE_H +#include "config.h" +#include +#include + +struct htable; + +/** + * htable_new - allocate a hash tree. + * @rehash: hash function to use for rehashing. + * @priv: private argument to @rehash function. + */ +struct htable *htable_new(size_t (*hash)(const void *elem, void *priv), + void *priv); + +/** + * htable_free - dellocate a hash tree. + * + * This doesn't do anything to any pointers left in it. + */ +void htable_free(const struct htable *); + +/** + * htable_rehash - use a hashtree's rehash function + * @elem: the argument to rehash() + * + */ +size_t htable_rehash(const void *elem); + +/** + * htable_add - add a pointer into a hash tree. + * @ht: the htable + * @hash: the hash value of the object + * @p: the non-NULL pointer + * + * Also note that this can only fail due to allocation failure. Otherwise, it + * returns true. + */ +bool htable_add(struct htable *ht, size_t hash, const void *p); + +/** + * htable_del - remove a pointer from a hash tree + * @ht: the htable + * @hash: the hash value of the object + * @p: the pointer + * + * Returns true if the pointer was found (and deleted). + */ +bool htable_del(struct htable *ht, size_t hash, const void *p); + +/** + * struct htable_iter - iterator or htable_first or htable_firstval etc. + * + * This refers to a location inside the hashtable. + */ +struct htable_iter { + size_t off; +}; + +/** + * htable_firstval - find a candidate for a given hash value + * @htable: the hashtable + * @i: the struct htable_iter to initialize + * @hash: the hash value + * + * You'll need to check the value is what you want; returns NULL if none. + * See Also: + * htable_delval() + */ +void *htable_firstval(const struct htable *htable, + struct htable_iter *i, size_t hash); + +/** + * htable_nextval - find another candidate for a given hash value + * @htable: the hashtable + * @i: the struct htable_iter to initialize + * @hash: the hash value + * + * You'll need to check the value is what you want; returns NULL if no more. + */ +void *htable_nextval(const struct htable *htable, + struct htable_iter *i, size_t hash); + +/** + * htable_get - find an entry in the hash table + * @ht: the hashtable + * @h: the hash value of the entry + * @cmp: the comparison function + * @ptr: the pointer to hand to the comparison function. + * + * Convenient inline wrapper for htable_firstval/htable_nextval loop. + */ +static inline void *htable_get(const struct htable *ht, + size_t h, + bool (*cmp)(const void *candidate, void *ptr), + const void *ptr) +{ + struct htable_iter i; + void *c; + + for (c = htable_firstval(ht,&i,h); c; c = htable_nextval(ht,&i,h)) { + if (cmp(c, (void *)ptr)) + return c; + } + return NULL; +} + +/** + * htable_first - find an entry in the hash table + * @ht: the hashtable + * @i: the struct htable_iter to initialize + * + * Get an entry in the hashtable; NULL if empty. + */ +void *htable_first(const struct htable *htable, struct htable_iter *i); + +/** + * htable_next - find another entry in the hash table + * @ht: the hashtable + * @i: the struct htable_iter to use + * + * Get another entry in the hashtable; NULL if all done. + * This is usually used after htable_first or prior non-NULL htable_next. + */ +void *htable_next(const struct htable *htable, struct htable_iter *i); + +/** + * htable_delval - remove an iterated pointer from a hash tree + * @ht: the htable + * @i: the htable_iter + * + * Usually used to delete a hash entry after it has been found with + * htable_firstval etc. + */ +void htable_delval(struct htable *ht, struct htable_iter *i); + +#endif /* CCAN_HTABLE_H */ diff --git a/lib/ccan/htable/htable_type.h b/lib/ccan/htable/htable_type.h new file mode 100644 index 0000000000..0d9e3fbb2d --- /dev/null +++ b/lib/ccan/htable/htable_type.h @@ -0,0 +1,97 @@ +#ifndef CCAN_HTABLE_TYPE_H +#define CCAN_HTABLE_TYPE_H +#include +#include "config.h" + +/** + * HTABLE_DEFINE_TYPE - create a set of htable ops for a type + * @type: a type whose pointers will be values in the hash. + * @keyof: a function/macro to extract a key from a @type element. + * @hashfn: a hash function for a @key + * @cmpfn: a comparison function for two keyof()s. + * @name: a name for all the functions to define (of form htable__*) + * + * NULL values may not be placed into the hash table. + * + * The following wrapper functions are defined; each one is a + * simplified version of the htable.h equivalent: + * + * // Creating and freeing. + * struct htable_@name *htable_@name_new(void); + * void htable_@name_free(const struct htable_@name *ht); + * + * // Add, delete and find. + * bool htable_@name_add(struct htable_@name *ht, const type *e); + * bool htable_@name_del(struct htable_@name *ht, const type *e); + * bool htable_@name_delkey(struct htable_@name *ht, const ktype *k); + * type *htable_@name_get(const struct htable_@name *ht, const ktype *k); + * + * // Iteration. + * struct htable_@name_iter; + * type *htable_@name_first(const struct htable_@name *ht, + * struct htable_@name_iter *i); + * type *htable_@name_next(const struct htable_@name *ht, + * struct htable_@name_iter *i); + */ +#define HTABLE_DEFINE_TYPE(type, keyof, hashfn, cmpfn, name) \ +struct htable_##name; \ +struct htable_##name##_iter { struct htable_iter i; }; \ +static inline size_t htable_##name##_hash(const void *elem, void *priv) \ +{ \ + return hashfn(keyof((const type *)elem)); \ +} \ +static inline struct htable_##name *htable_##name##_new(void) \ +{ \ + return (struct htable_##name *)htable_new(htable_##name##_hash, \ + NULL); \ +} \ +static inline void htable_##name##_free(const struct htable_##name *ht) \ +{ \ + htable_free((const struct htable *)ht); \ +} \ +static inline bool htable_##name##_add(struct htable_##name *ht, \ + const type *elem) \ +{ \ + return htable_add((struct htable *)ht, hashfn(keyof(elem)), elem); \ +} \ +static inline bool htable_##name##_del(const struct htable_##name *ht, \ + const type *elem) \ +{ \ + return htable_del((struct htable *)ht, hashfn(keyof(elem)), elem); \ +} \ +static inline type *htable_##name##_get(const struct htable_##name *ht, \ + const HTABLE_KTYPE(keyof) k) \ +{ \ + /* Typecheck for cmpfn */ \ + (void)sizeof(cmpfn((const type *)NULL, \ + keyof((const type *)NULL))); \ + return (type *)htable_get((const struct htable *)ht, \ + hashfn(k), \ + (bool (*)(const void *, void *))(cmpfn), \ + k); \ +} \ +static inline bool htable_##name##_delkey(struct htable_##name *ht, \ + const HTABLE_KTYPE(keyof) k) \ +{ \ + type *elem = htable_##name##_get(ht, k); \ + if (elem) \ + return htable_##name##_del(ht, elem); \ + return false; \ +} \ +static inline type *htable_##name##_first(const struct htable_##name *ht, \ + struct htable_##name##_iter *iter) \ +{ \ + return htable_first((const struct htable *)ht, &iter->i); \ +} \ +static inline type *htable_##name##_next(const struct htable_##name *ht, \ + struct htable_##name##_iter *iter) \ +{ \ + return htable_next((const struct htable *)ht, &iter->i); \ +} + +#if HAVE_TYPEOF +#define HTABLE_KTYPE(keyof) typeof(keyof(NULL)) +#else +#define HTABLE_KTYPE(keyof) void * +#endif +#endif /* CCAN_HTABLE_TYPE_H */ diff --git a/lib/ccan/htable/test/run-type.c b/lib/ccan/htable/test/run-type.c new file mode 100644 index 0000000000..02dac29e10 --- /dev/null +++ b/lib/ccan/htable/test/run-type.c @@ -0,0 +1,176 @@ +#include +#include +#include +#include +#include + +#define NUM_VALS (1 << HTABLE_BASE_BITS) + +struct obj { + /* Makes sure we don't try to treat and obj as a key or vice versa */ + unsigned char unused; + unsigned int key; +}; + +static const unsigned int *objkey(const struct obj *obj) +{ + return &obj->key; +} + +/* We use the number divided by two as the hash (for lots of + collisions), plus set all the higher bits so we can detect if they + don't get masked out. */ +static size_t objhash(const unsigned int *key) +{ + size_t h = *key / 2; + h |= -1UL << HTABLE_BASE_BITS; + return h; +} + +static bool cmp(const struct obj *obj, const unsigned int *key) +{ + return obj->key == *key; +} + +HTABLE_DEFINE_TYPE(struct obj, objkey, objhash, cmp, obj); + +static void add_vals(struct htable_obj *ht, + struct obj val[], unsigned int num) +{ + unsigned int i; + + for (i = 0; i < num; i++) { + if (htable_obj_get(ht, &i)) { + fail("%u already in hash", i); + return; + } + htable_obj_add(ht, &val[i]); + if (htable_obj_get(ht, &i) != &val[i]) { + fail("%u not added to hash", i); + return; + } + } + pass("Added %u numbers to hash", i); +} + +static void find_vals(const struct htable_obj *ht, + const struct obj val[], unsigned int num) +{ + unsigned int i; + + for (i = 0; i < num; i++) { + if (htable_obj_get(ht, &i) != &val[i]) { + fail("%u not found in hash", i); + return; + } + } + pass("Found %u numbers in hash", i); +} + +static void del_vals(struct htable_obj *ht, + const struct obj val[], unsigned int num) +{ + unsigned int i; + + for (i = 0; i < num; i++) { + if (!htable_obj_delkey(ht, &val[i].key)) { + fail("%u not deleted from hash", i); + return; + } + } + pass("Deleted %u numbers in hash", i); +} + +static void del_vals_bykey(struct htable_obj *ht, + const struct obj val[], unsigned int num) +{ + unsigned int i; + + for (i = 0; i < num; i++) { + if (!htable_obj_delkey(ht, &i)) { + fail("%u not deleted by key from hash", i); + return; + } + } + pass("Deleted %u numbers by key from hash", i); +} + +static bool check_mask(struct htable *ht, const struct obj val[], unsigned num) +{ + uint64_t i; + + for (i = 0; i < num; i++) { + if (((uintptr_t)&val[i] & ht->common_mask) != ht->common_bits) + return false; + } + return true; +} + +int main(int argc, char *argv[]) +{ + unsigned int i; + struct htable_obj *ht; + struct obj val[NUM_VALS]; + unsigned int dne; + void *p; + struct htable_obj_iter iter; + + plan_tests(20); + for (i = 0; i < NUM_VALS; i++) + val[i].key = i; + dne = i; + + ht = htable_obj_new(); + ok1(((struct htable *)ht)->max < (1 << ((struct htable *)ht)->bits)); + ok1(((struct htable *)ht)->bits == HTABLE_BASE_BITS); + + /* We cannot find an entry which doesn't exist. */ + ok1(!htable_obj_get(ht, &dne)); + + /* Fill it, it should increase in size (once). */ + add_vals(ht, val, NUM_VALS); + ok1(((struct htable *)ht)->bits == HTABLE_BASE_BITS + 1); + ok1(((struct htable *)ht)->max < (1 << ((struct htable *)ht)->bits)); + + /* Mask should be set. */ + ok1(((struct htable *)ht)->common_mask != 0); + ok1(((struct htable *)ht)->common_mask != -1); + ok1(check_mask((struct htable *)ht, val, NUM_VALS)); + + /* Find all. */ + find_vals(ht, val, NUM_VALS); + ok1(!htable_obj_get(ht, &dne)); + + /* Walk once, should get them all. */ + i = 0; + for (p = htable_obj_first(ht,&iter); p; p = htable_obj_next(ht, &iter)) + i++; + ok1(i == NUM_VALS); + + /* Delete all. */ + del_vals(ht, val, NUM_VALS); + ok1(!htable_obj_get(ht, &val[0].key)); + + /* Worst case, a "pointer" which doesn't have any matching bits. */ + htable_add((struct htable *)ht, 0, + (void *)~(uintptr_t)&val[NUM_VALS-1]); + htable_obj_add(ht, &val[NUM_VALS-1]); + ok1(((struct htable *)ht)->common_mask == 0); + ok1(((struct htable *)ht)->common_bits == 0); + /* Delete the bogus one before we trip over it. */ + htable_del((struct htable *)ht, 0, + (void *)~(uintptr_t)&val[NUM_VALS-1]); + + /* Add the rest. */ + add_vals(ht, val, NUM_VALS-1); + + /* Check we can find them all. */ + find_vals(ht, val, NUM_VALS); + ok1(!htable_obj_get(ht, &dne)); + + /* Delete them all by key. */ + del_vals_bykey(ht, val, NUM_VALS); + htable_obj_free(ht); + + return exit_status(); +} diff --git a/lib/ccan/htable/test/run.c b/lib/ccan/htable/test/run.c new file mode 100644 index 0000000000..ece46a0fd7 --- /dev/null +++ b/lib/ccan/htable/test/run.c @@ -0,0 +1,176 @@ +#include +#include +#include +#include +#include + +#define NUM_VALS (1 << HTABLE_BASE_BITS) + +/* We use the number divided by two as the hash (for lots of + collisions), plus set all the higher bits so we can detect if they + don't get masked out. */ +static size_t hash(const void *elem, void *unused) +{ + size_t h = *(uint64_t *)elem / 2; + h |= -1UL << HTABLE_BASE_BITS; + return h; +} + +static bool objcmp(const void *htelem, void *cmpdata) +{ + return *(uint64_t *)htelem == *(uint64_t *)cmpdata; +} + +static void add_vals(struct htable *ht, + const uint64_t val[], unsigned int num) +{ + uint64_t i; + + for (i = 0; i < num; i++) { + if (htable_get(ht, hash(&i, NULL), objcmp, &i)) { + fail("%llu already in hash", (long long)i); + return; + } + htable_add(ht, hash(&val[i], NULL), &val[i]); + if (htable_get(ht, hash(&i, NULL), objcmp, &i) != &val[i]) { + fail("%llu not added to hash", (long long)i); + return; + } + } + pass("Added %llu numbers to hash", (long long)i); +} + +#if 0 +static void refill_vals(struct htable *ht, + const uint64_t val[], unsigned int num) +{ + uint64_t i; + + for (i = 0; i < num; i++) { + if (htable_get(ht, hash(&i, NULL), objcmp, &i)) + continue; + htable_add(ht, hash(&val[i], NULL), &val[i]); + } +} +#endif + +static void find_vals(struct htable *ht, + const uint64_t val[], unsigned int num) +{ + uint64_t i; + + for (i = 0; i < num; i++) { + if (htable_get(ht, hash(&i, NULL), objcmp, &i) != &val[i]) { + fail("%llu not found in hash", (long long)i); + return; + } + } + pass("Found %llu numbers in hash", (long long)i); +} + +static void del_vals(struct htable *ht, + const uint64_t val[], unsigned int num) +{ + uint64_t i; + + for (i = 0; i < num; i++) { + if (!htable_del(ht, hash(&val[i], NULL), &val[i])) { + fail("%llu not deleted from hash", (long long)i); + return; + } + } + pass("Deleted %llu numbers in hash", (long long)i); +} + +static bool check_mask(struct htable *ht, uint64_t val[], unsigned num) +{ + uint64_t i; + + for (i = 0; i < num; i++) { + if (((uintptr_t)&val[i] & ht->common_mask) != ht->common_bits) + return false; + } + return true; +} + +int main(int argc, char *argv[]) +{ + unsigned int i; + uintptr_t perfect_bit; + struct htable *ht; + uint64_t val[NUM_VALS]; + uint64_t dne; + void *p; + struct htable_iter iter; + + plan_tests(23); + for (i = 0; i < NUM_VALS; i++) + val[i] = i; + dne = i; + + ht = htable_new(hash, NULL); + ok1(ht->max < (1 << ht->bits)); + ok1(ht->bits == HTABLE_BASE_BITS); + + /* We cannot find an entry which doesn't exist. */ + ok1(!htable_get(ht, hash(&dne, NULL), objcmp, &dne)); + + /* Fill it, it should increase in size (once). */ + add_vals(ht, val, NUM_VALS); + ok1(ht->bits == HTABLE_BASE_BITS + 1); + ok1(ht->max < (1 << ht->bits)); + + /* Mask should be set. */ + ok1(ht->common_mask != 0); + ok1(ht->common_mask != -1); + ok1(check_mask(ht, val, NUM_VALS)); + + /* Find all. */ + find_vals(ht, val, NUM_VALS); + ok1(!htable_get(ht, hash(&dne, NULL), objcmp, &dne)); + + /* Walk once, should get them all. */ + i = 0; + for (p = htable_first(ht,&iter); p; p = htable_next(ht, &iter)) + i++; + ok1(i == NUM_VALS); + + /* Delete all. */ + del_vals(ht, val, NUM_VALS); + ok1(!htable_get(ht, hash(&val[0], NULL), objcmp, &val[0])); + + /* Worst case, a "pointer" which doesn't have any matching bits. */ + htable_add(ht, 0, (void *)~(uintptr_t)&val[NUM_VALS-1]); + htable_add(ht, hash(&val[NUM_VALS-1], NULL), &val[NUM_VALS-1]); + ok1(ht->common_mask == 0); + ok1(ht->common_bits == 0); + /* Get rid of bogus pointer before we trip over it! */ + htable_del(ht, 0, (void *)~(uintptr_t)&val[NUM_VALS-1]); + + /* Add the rest. */ + add_vals(ht, val, NUM_VALS-1); + + /* Check we can find them all. */ + find_vals(ht, val, NUM_VALS); + ok1(!htable_get(ht, hash(&dne, NULL), objcmp, &dne)); + + htable_free(ht); + + /* Corner cases: wipe out the perfect bit using bogus pointer. */ + ht = htable_new(hash, NULL); + htable_add(ht, 0, (void *)((uintptr_t)&val[NUM_VALS-1])); + ok1(ht->perfect_bit); + perfect_bit = ht->perfect_bit; + htable_add(ht, 0, (void *)((uintptr_t)&val[NUM_VALS-1] + | perfect_bit)); + ok1(ht->perfect_bit == 0); + htable_del(ht, 0, (void *)((uintptr_t)&val[NUM_VALS-1] | perfect_bit)); + + /* Enlarging should restore it... */ + add_vals(ht, val, NUM_VALS-1); + + ok1(ht->perfect_bit != 0); + htable_free(ht); + + return exit_status(); +} diff --git a/lib/ccan/htable/tools/Makefile b/lib/ccan/htable/tools/Makefile new file mode 100644 index 0000000000..001e160b78 --- /dev/null +++ b/lib/ccan/htable/tools/Makefile @@ -0,0 +1,5 @@ +CFLAGS=-Wall -Werror -O3 -I../../.. + +speed: speed.o ../../hash.o + +speed.o: speed.c ../htable.h ../htable.c diff --git a/lib/ccan/htable/tools/speed.c b/lib/ccan/htable/tools/speed.c new file mode 100644 index 0000000000..26231924a1 --- /dev/null +++ b/lib/ccan/htable/tools/speed.c @@ -0,0 +1,377 @@ +/* Simple speed tests for hashtables. */ +#include +#include +#include +#include +#include +#include +#include +#include + +static size_t hashcount; +struct object { + /* The key. */ + unsigned int key; + + /* Some contents. Doubles as consistency check. */ + struct object *self; +}; + +static const unsigned int *objkey(const struct object *obj) +{ + return &obj->key; +} + +static size_t hash_obj(const unsigned int *key) +{ + hashcount++; + return hashl(key, 1, 0); +} + +static bool cmp(const unsigned int *key1, const unsigned int *key2) +{ + return *key1 == *key2; +} + +HTABLE_DEFINE_TYPE(struct object, objkey, hash_obj, cmp, obj); + +static unsigned int popcount(unsigned long val) +{ +#if HAVE_BUILTIN_POPCOUNTL + return __builtin_popcountl(val); +#else + if (sizeof(long) == sizeof(u64)) { + u64 v = val; + v = (v & 0x5555555555555555ULL) + + ((v >> 1) & 0x5555555555555555ULL); + v = (v & 0x3333333333333333ULL) + + ((v >> 1) & 0x3333333333333333ULL); + v = (v & 0x0F0F0F0F0F0F0F0FULL) + + ((v >> 1) & 0x0F0F0F0F0F0F0F0FULL); + v = (v & 0x00FF00FF00FF00FFULL) + + ((v >> 1) & 0x00FF00FF00FF00FFULL); + v = (v & 0x0000FFFF0000FFFFULL) + + ((v >> 1) & 0x0000FFFF0000FFFFULL); + v = (v & 0x00000000FFFFFFFFULL) + + ((v >> 1) & 0x00000000FFFFFFFFULL); + return v; + } + val = (val & 0x55555555ULL) + ((val >> 1) & 0x55555555ULL); + val = (val & 0x33333333ULL) + ((val >> 1) & 0x33333333ULL); + val = (val & 0x0F0F0F0FULL) + ((val >> 1) & 0x0F0F0F0FULL); + val = (val & 0x00FF00FFULL) + ((val >> 1) & 0x00FF00FFULL); + val = (val & 0x0000FFFFULL) + ((val >> 1) & 0x0000FFFFULL); + return val; +#endif +} + +static size_t perfect(const struct htable *ht) +{ + size_t i, placed_perfect = 0; + + for (i = 0; i < ((size_t)1 << ht->bits); i++) { + if (!entry_is_valid(ht->table[i])) + continue; + if (hash_bucket(ht, ht->rehash(get_raw_ptr(ht, ht->table[i]), + ht->priv)) == i) { + assert((ht->table[i] & ht->perfect_bit) + == ht->perfect_bit); + placed_perfect++; + } + } + return placed_perfect; +} + +static size_t count_deleted(const struct htable *ht) +{ + size_t i, delete_markers = 0; + + for (i = 0; i < ((size_t)1 << ht->bits); i++) { + if (ht->table[i] == HTABLE_DELETED) + delete_markers++; + } + return delete_markers; +} + +/* Nanoseconds per operation */ +static size_t normalize(const struct timeval *start, + const struct timeval *stop, + unsigned int num) +{ + struct timeval diff; + + timersub(stop, start, &diff); + + /* Floating point is more accurate here. */ + return (double)(diff.tv_sec * 1000000 + diff.tv_usec) + / num * 1000; +} + +static size_t worst_run(struct htable *ht, size_t *deleted) +{ + size_t longest = 0, len = 0, this_del = 0, i; + + *deleted = 0; + /* This doesn't take into account end-wrap, but gives an idea. */ + for (i = 0; i < ((size_t)1 << ht->bits); i++) { + if (ht->table[i]) { + len++; + if (ht->table[i] == HTABLE_DELETED) + this_del++; + } else { + if (len > longest) { + longest = len; + *deleted = this_del; + } + len = 0; + this_del = 0; + } + } + return longest; +} + +int main(int argc, char *argv[]) +{ + struct object *objs; + size_t i, j, num, deleted; + struct timeval start, stop; + struct htable_obj *ht; + struct htable *htr; + bool make_dumb = false; + + if (argv[1] && strcmp(argv[1], "--dumb") == 0) { + argv++; + make_dumb = true; + } + num = argv[1] ? atoi(argv[1]) : 1000000; + objs = calloc(num, sizeof(objs[0])); + + for (i = 0; i < num; i++) { + objs[i].key = i; + objs[i].self = &objs[i]; + } + + ht = htable_obj_new(); + htr = (void *)ht; + + printf("Initial insert: "); + fflush(stdout); + gettimeofday(&start, NULL); + for (i = 0; i < num; i++) + htable_obj_add(ht, objs[i].self); + gettimeofday(&stop, NULL); + printf(" %zu ns\n", normalize(&start, &stop, num)); + printf("Details: hash size %u, mask bits %u, perfect %.0f%%\n", + 1U << htr->bits, popcount(htr->common_mask), + perfect(htr) * 100.0 / htr->elems); + + if (make_dumb) { + /* Screw with mask, to hobble us. */ + update_common(htr, (void *)~htr->common_bits); + printf("Details: DUMB MODE: mask bits %u\n", + popcount(htr->common_mask)); + } + + printf("Initial lookup (match): "); + fflush(stdout); + gettimeofday(&start, NULL); + for (i = 0; i < num; i++) + if (htable_obj_get(ht, &i)->self != objs[i].self) + abort(); + gettimeofday(&stop, NULL); + printf(" %zu ns\n", normalize(&start, &stop, num)); + + printf("Initial lookup (miss): "); + fflush(stdout); + gettimeofday(&start, NULL); + for (i = 0; i < num; i++) { + unsigned int n = i + num; + if (htable_obj_get(ht, &n)) + abort(); + } + gettimeofday(&stop, NULL); + printf(" %zu ns\n", normalize(&start, &stop, num)); + + /* Lookups in order are very cache-friendly for judy; try random */ + printf("Initial lookup (random): "); + fflush(stdout); + gettimeofday(&start, NULL); + for (i = 0, j = 0; i < num; i++, j = (j + 10007) % num) + if (htable_obj_get(ht, &j)->self != &objs[j]) + abort(); + gettimeofday(&stop, NULL); + printf(" %zu ns\n", normalize(&start, &stop, num)); + + hashcount = 0; + printf("Initial delete all: "); + fflush(stdout); + gettimeofday(&start, NULL); + for (i = 0; i < num; i++) + if (!htable_obj_del(ht, objs[i].self)) + abort(); + gettimeofday(&stop, NULL); + printf(" %zu ns\n", normalize(&start, &stop, num)); + printf("Details: rehashes %zu\n", hashcount); + + printf("Initial re-inserting: "); + fflush(stdout); + gettimeofday(&start, NULL); + for (i = 0; i < num; i++) + htable_obj_add(ht, objs[i].self); + gettimeofday(&stop, NULL); + printf(" %zu ns\n", normalize(&start, &stop, num)); + + hashcount = 0; + printf("Deleting first half: "); + fflush(stdout); + gettimeofday(&start, NULL); + for (i = 0; i < num; i+=2) + if (!htable_obj_del(ht, objs[i].self)) + abort(); + gettimeofday(&stop, NULL); + printf(" %zu ns\n", normalize(&start, &stop, num)); + + printf("Details: rehashes %zu, delete markers %zu\n", + hashcount, count_deleted(htr)); + + printf("Adding (a different) half: "); + fflush(stdout); + + for (i = 0; i < num; i+=2) + objs[i].key = num+i; + + gettimeofday(&start, NULL); + for (i = 0; i < num; i+=2) + htable_obj_add(ht, objs[i].self); + gettimeofday(&stop, NULL); + printf(" %zu ns\n", normalize(&start, &stop, num)); + + printf("Details: delete markers %zu, perfect %.0f%%\n", + count_deleted(htr), perfect(htr) * 100.0 / htr->elems); + + printf("Lookup after half-change (match): "); + fflush(stdout); + gettimeofday(&start, NULL); + for (i = 1; i < num; i+=2) + if (htable_obj_get(ht, &i)->self != objs[i].self) + abort(); + for (i = 0; i < num; i+=2) { + unsigned int n = i + num; + if (htable_obj_get(ht, &n)->self != objs[i].self) + abort(); + } + gettimeofday(&stop, NULL); + printf(" %zu ns\n", normalize(&start, &stop, num)); + + printf("Lookup after half-change (miss): "); + fflush(stdout); + gettimeofday(&start, NULL); + for (i = 0; i < num; i++) { + unsigned int n = i + num * 2; + if (htable_obj_get(ht, &n)) + abort(); + } + gettimeofday(&stop, NULL); + printf(" %zu ns\n", normalize(&start, &stop, num)); + + /* Hashtables with delete markers can fill with markers over time. + * so do some changes to see how it operates in long-term. */ + for (i = 0; i < 5; i++) { + if (i == 0) { + /* We don't measure this: jmap is different. */ + printf("Details: initial churn\n"); + } else { + printf("Churning %s time: ", + i == 1 ? "second" + : i == 2 ? "third" + : i == 3 ? "fourth" + : "fifth"); + fflush(stdout); + } + gettimeofday(&start, NULL); + for (j = 0; j < num; j++) { + if (!htable_obj_del(ht, &objs[j])) + abort(); + objs[j].key = num*i+j; + if (!htable_obj_add(ht, &objs[j])) + abort(); + } + gettimeofday(&stop, NULL); + if (i != 0) + printf(" %zu ns\n", normalize(&start, &stop, num)); + } + + /* Spread out the keys more to try to make it harder. */ + printf("Details: reinserting with spread\n"); + for (i = 0; i < num; i++) { + if (!htable_obj_del(ht, objs[i].self)) + abort(); + objs[i].key = num * 5 + i * 9; + if (!htable_obj_add(ht, objs[i].self)) + abort(); + } + printf("Details: delete markers %zu, perfect %.0f%%\n", + count_deleted(htr), perfect(htr) * 100.0 / htr->elems); + i = worst_run(htr, &deleted); + printf("Details: worst run %zu (%zu deleted)\n", i, deleted); + + printf("Lookup after churn & spread (match): "); + fflush(stdout); + gettimeofday(&start, NULL); + for (i = 0; i < num; i++) { + unsigned int n = num * 5 + i * 9; + if (htable_obj_get(ht, &n)->self != objs[i].self) + abort(); + } + gettimeofday(&stop, NULL); + printf(" %zu ns\n", normalize(&start, &stop, num)); + + printf("Lookup after churn & spread (miss): "); + fflush(stdout); + gettimeofday(&start, NULL); + for (i = 0; i < num; i++) { + unsigned int n = num * (5 + 9) + i * 9; + if (htable_obj_get(ht, &n)) + abort(); + } + gettimeofday(&stop, NULL); + printf(" %zu ns\n", normalize(&start, &stop, num)); + + printf("Lookup after churn & spread (random): "); + fflush(stdout); + gettimeofday(&start, NULL); + for (i = 0, j = 0; i < num; i++, j = (j + 10007) % num) { + unsigned int n = num * 5 + j * 9; + if (htable_obj_get(ht, &n)->self != &objs[j]) + abort(); + } + gettimeofday(&stop, NULL); + printf(" %zu ns\n", normalize(&start, &stop, num)); + + hashcount = 0; + printf("Deleting half after churn & spread: "); + fflush(stdout); + gettimeofday(&start, NULL); + for (i = 0; i < num; i+=2) + if (!htable_obj_del(ht, objs[i].self)) + abort(); + gettimeofday(&stop, NULL); + printf(" %zu ns\n", normalize(&start, &stop, num)); + + printf("Adding (a different) half after churn & spread: "); + fflush(stdout); + + for (i = 0; i < num; i+=2) + objs[i].key = num*6+i*9; + + gettimeofday(&start, NULL); + for (i = 0; i < num; i+=2) + htable_obj_add(ht, objs[i].self); + gettimeofday(&stop, NULL); + printf(" %zu ns\n", normalize(&start, &stop, num)); + + printf("Details: delete markers %zu, perfect %.0f%%\n", + count_deleted(htr), perfect(htr) * 100.0 / htr->elems); + + return 0; +} -- cgit