X-Git-Url: http://git.ozlabs.org/?p=ccan;a=blobdiff_plain;f=ccan%2Fhtable%2Fhtable.c;h=d3c4f9b41187a9ef0481e332d710e95e42b29bea;hp=e1d13699ea85811fe2f61adbb1ce4eca942406c8;hb=7623d0829a63e7f95ed6f116b7e9f2f4a023e8e7;hpb=f359fde1b7c3ca60faebd4df710bf30a68784e27

diff --git a/ccan/htable/htable.c b/ccan/htable/htable.c
index e1d13699..d3c4f9b4 100644
--- a/ccan/htable/htable.c
+++ b/ccan/htable/htable.c
@@ -2,6 +2,7 @@
 #include <ccan/htable/htable.h>
 #include <ccan/compiler/compiler.h>
 #include <stdlib.h>
+#include <stdio.h>
 #include <limits.h>
 #include <stdbool.h>
 #include <assert.h>
@@ -10,6 +11,33 @@
 /* We use 0x1 as deleted marker. */
 #define HTABLE_DELETED (0x1)
 
+/* perfect_bitnum 63 means there's no perfect bitnum */
+#define NO_PERFECT_BIT (sizeof(uintptr_t) * CHAR_BIT - 1)
+
+static void *htable_default_alloc(struct htable *ht, size_t len)
+{
+	return calloc(len, 1);
+}
+
+static void htable_default_free(struct htable *ht, void *p)
+{
+	free(p);
+}
+
+static void *(*htable_alloc)(struct htable *, size_t) = htable_default_alloc;
+static void (*htable_free)(struct htable *, void *) = htable_default_free;
+
+void htable_set_allocator(void *(*alloc)(struct htable *, size_t len),
+			  void (*free)(struct htable *, void *p))
+{
+	if (!alloc)
+		alloc = htable_default_alloc;
+	if (!free)
+		free = htable_default_free;
+	htable_alloc = alloc;
+	htable_free = free;
+}
+
 /* 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)
@@ -33,6 +61,11 @@ static inline bool entry_is_valid(uintptr_t e)
 	return e > HTABLE_DELETED;
 }
 
+static inline uintptr_t ht_perfect_mask(const struct htable *ht)
+{
+	return (uintptr_t)2 << ht->perfect_bitnum;
+}
+
 static inline uintptr_t get_hash_ptr_bits(const struct htable *ht,
 					  size_t hash)
 {
@@ -40,7 +73,7 @@ static inline uintptr_t get_hash_ptr_bits(const struct htable *ht,
 	 * 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;
+		& ht->common_mask & ~ht_perfect_mask(ht);
 }
 
 void htable_init(struct htable *ht,
@@ -50,14 +83,17 @@ void htable_init(struct htable *ht,
 	*ht = empty;
 	ht->rehash = rehash;
 	ht->priv = priv;
-	ht->table = &ht->perfect_bit;
+	ht->table = &ht->common_bits;
 }
 
-/* We've changed ht->bits, update ht->max and ht->max_with_deleted */
-static void htable_adjust_capacity(struct htable *ht)
+static inline size_t ht_max(const struct htable *ht)
 {
-	ht->max = ((size_t)3 << ht->bits) / 4;
-	ht->max_with_deleted = ((size_t)9 << ht->bits) / 10;
+	return ((size_t)3 << ht->bits) / 4;
+}
+
+static inline size_t ht_max_with_deleted(const struct htable *ht)
+{
+	return ((size_t)9 << ht->bits) / 10;
 }
 
 bool htable_init_sized(struct htable *ht,
@@ -72,25 +108,25 @@ bool htable_init_sized(struct htable *ht,
 			break;
 	}
 
-	ht->table = calloc(1 << ht->bits, sizeof(size_t));
+	ht->table = htable_alloc(ht, sizeof(size_t) << ht->bits);
 	if (!ht->table) {
-		ht->table = &ht->perfect_bit;
+		ht->table = &ht->common_bits;
 		return false;
 	}
-	htable_adjust_capacity(ht);
+	(void)htable_debug(ht, HTABLE_LOC);
 	return true;
 }
 	
 void htable_clear(struct htable *ht)
 {
-	if (ht->table != &ht->perfect_bit)
-		free((void *)ht->table);
+	if (ht->table != &ht->common_bits)
+		htable_free(ht, (void *)ht->table);
 	htable_init(ht, ht->rehash, ht->priv);
 }
 
-bool htable_copy(struct htable *dst, const struct htable *src)
+bool htable_copy_(struct htable *dst, const struct htable *src)
 {
-	uintptr_t *htable = malloc(sizeof(size_t) << src->bits);
+	uintptr_t *htable = htable_alloc(dst, sizeof(size_t) << src->bits);
 
 	if (!htable)
 		return false;
@@ -122,21 +158,21 @@ static void *htable_val(const struct htable *ht,
 	return NULL;
 }
 
-void *htable_firstval(const struct htable *ht,
-		      struct htable_iter *i, size_t hash)
+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);
+	return htable_val(ht, i, hash, ht_perfect_mask(ht));
 }
 
-void *htable_nextval(const struct htable *ht,
-		     struct htable_iter *i, size_t hash)
+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)
+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]))
@@ -145,7 +181,7 @@ void *htable_first(const struct htable *ht, struct htable_iter *i)
 	return NULL;
 }
 
-void *htable_next(const struct htable *ht, struct htable_iter *i)
+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]))
@@ -154,7 +190,7 @@ void *htable_next(const struct htable *ht, struct htable_iter *i)
 	return NULL;
 }
 
-void *htable_prev(const struct htable *ht, struct htable_iter *i)
+void *htable_prev_(const struct htable *ht, struct htable_iter *i)
 {
 	for (;;) {
 		if (!i->off)
@@ -169,7 +205,7 @@ void *htable_prev(const struct htable *ht, struct htable_iter *i)
 static void ht_add(struct htable *ht, const void *new, size_t h)
 {
 	size_t i;
-	uintptr_t perfect = ht->perfect_bit;
+	uintptr_t perfect = ht_perfect_mask(ht);
 
 	i = hash_bucket(ht, h);
 
@@ -187,41 +223,42 @@ static COLD bool double_table(struct htable *ht)
 	uintptr_t *oldtable, e;
 
 	oldtable = ht->table;
-	ht->table = calloc(1 << (ht->bits+1), sizeof(size_t));
+	ht->table = htable_alloc(ht, sizeof(size_t) << (ht->bits+1));
 	if (!ht->table) {
 		ht->table = oldtable;
 		return false;
 	}
 	ht->bits++;
-	htable_adjust_capacity(ht);
 
 	/* If we lost our "perfect bit", get it back now. */
-	if (!ht->perfect_bit && ht->common_mask) {
+	if (ht->perfect_bitnum == NO_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;
+			if (ht->common_mask & ((size_t)2 << i)) {
+				ht->perfect_bitnum = i;
 				break;
 			}
 		}
 	}
 
-	if (oldtable != &ht->perfect_bit) {
+	if (oldtable != &ht->common_bits) {
 		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));
 			}
 		}
-		free(oldtable);
+		htable_free(ht, oldtable);
 	}
 	ht->deleted = 0;
+
+	(void)htable_debug(ht, HTABLE_LOC);
 	return true;
 }
 
 static COLD void rehash_table(struct htable *ht)
 {
 	size_t start, i;
-	uintptr_t e;
+	uintptr_t e, perfect = ht_perfect_mask(ht);
 
 	/* Beware wrap cases: we need to start from first empty bucket. */
 	for (start = 0; ht->table[start]; start++);
@@ -233,13 +270,14 @@ static COLD void rehash_table(struct htable *ht)
 			continue;
 		if (e == HTABLE_DELETED)
 			ht->table[h] = 0;
-		else if (!(e & ht->perfect_bit)) {
+		else if (!(e & perfect)) {
 			void *p = get_raw_ptr(ht, e);
 			ht->table[h] = 0;
 			ht_add(ht, p, ht->rehash(p, ht->priv));
 		}
 	}
 	ht->deleted = 0;
+	(void)htable_debug(ht, HTABLE_LOC);
 }
 
 /* We stole some bits, now we need to put them back... */
@@ -260,7 +298,8 @@ static COLD void update_common(struct htable *ht, const void *p)
 
 		ht->common_mask = ~((uintptr_t)1 << i);
 		ht->common_bits = ((uintptr_t)p & ht->common_mask);
-		ht->perfect_bit = 1;
+		ht->perfect_bitnum = 0;
+		(void)htable_debug(ht, HTABLE_LOC);
 		return;
 	}
 
@@ -282,14 +321,16 @@ static COLD void update_common(struct htable *ht, const void *p)
 	/* Take away those bits from our mask, bits and perfect bit. */
 	ht->common_mask &= ~maskdiff;
 	ht->common_bits &= ~maskdiff;
-	ht->perfect_bit &= ~maskdiff;
+	if (ht_perfect_mask(ht) & maskdiff)
+		ht->perfect_bitnum = NO_PERFECT_BIT;
+	(void)htable_debug(ht, HTABLE_LOC);
 }
 
-bool htable_add(struct htable *ht, size_t hash, const void *p)
+bool htable_add_(struct htable *ht, size_t hash, const void *p)
 {
-	if (ht->elems+1 > ht->max && !double_table(ht))
+	if (ht->elems+1 > ht_max(ht) && !double_table(ht))
 		return false;
-	if (ht->elems+1 + ht->deleted > ht->max_with_deleted)
+	if (ht->elems+1 + ht->deleted > ht_max_with_deleted(ht))
 		rehash_table(ht);
 	assert(p);
 	if (((uintptr_t)p & ht->common_mask) != ht->common_bits)
@@ -300,7 +341,7 @@ bool htable_add(struct htable *ht, size_t hash, const void *p)
 	return true;
 }
 
-bool htable_del(struct htable *ht, size_t h, const void *p)
+bool htable_del_(struct htable *ht, size_t h, const void *p)
 {
 	struct htable_iter i;
 	void *c;
@@ -314,7 +355,7 @@ bool htable_del(struct htable *ht, size_t h, const void *p)
 	return false;
 }
 
-void htable_delval(struct htable *ht, struct htable_iter *i)
+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]));
@@ -323,3 +364,53 @@ void htable_delval(struct htable *ht, struct htable_iter *i)
 	ht->table[i->off] = HTABLE_DELETED;
 	ht->deleted++;
 }
+
+struct htable *htable_check(const struct htable *ht, const char *abortstr)
+{
+	void *p;
+	struct htable_iter i;
+	size_t n = 0;
+
+	/* Use non-DEBUG versions here, to avoid infinite recursion with
+	 * CCAN_HTABLE_DEBUG! */
+	for (p = htable_first_(ht, &i); p; p = htable_next_(ht, &i)) {
+		struct htable_iter i2;
+		void *c;
+		size_t h = ht->rehash(p, ht->priv);
+		bool found = false;
+
+		n++;
+
+		/* Open-code htable_get to avoid CCAN_HTABLE_DEBUG */
+		for (c = htable_firstval_(ht, &i2, h);
+		     c;
+		     c = htable_nextval_(ht, &i2, h)) {
+			if (c == p) {
+				found = true;
+				break;
+			}
+		}
+
+		if (!found) {
+			if (abortstr) {
+				fprintf(stderr,
+					"%s: element %p in position %zu"
+					" cannot find itself\n",
+					abortstr, p, i.off);
+				abort();
+			}
+			return NULL;
+		}
+	}
+	if (n != ht->elems) {
+		if (abortstr) {
+			fprintf(stderr,
+				"%s: found %zu elems, expected %zu\n",
+				abortstr, n, ht->elems);
+			abort();
+		}
+		return NULL;
+	}
+
+	return (struct htable *)ht;
+}