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authorEric Anholt <[email protected]>2012-11-06 23:18:41 -0800
committerChad Versace <[email protected]>2012-11-12 15:52:42 -0800
commit35fd61bd99c15c2e13d3945b41c4db7df6e64319 (patch)
tree23771a21726cb11bd292ba51a5e95022032c7af6 /src/mesa/main/hash_table.h
parent1e8dd15311dab217d74c7c5d5a2dee6f6d7bf95e (diff)
mesa: Import a copy of the open-addressing hash table code I wrote.
Mesa's chaining hash table for object names is slow, and this should be much faster. I namespaced the functions under _mesa_*, to avoid visibility troubles that we may have had before with hash_table_* functions. v2: Move .c file to main/, const a few things, clean up loop conditions, add/extend some comments. Reviewed-by: Brian Paul <[email protected]> Reviewed-by: Chad Versace <[email protected]> Acked-by: Kenneth Graunke <[email protected]> (v1)
Diffstat (limited to 'src/mesa/main/hash_table.h')
-rw-r--r--src/mesa/main/hash_table.h105
1 files changed, 105 insertions, 0 deletions
diff --git a/src/mesa/main/hash_table.h b/src/mesa/main/hash_table.h
new file mode 100644
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+++ b/src/mesa/main/hash_table.h
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+/*
+ * Copyright © 2009,2012 Intel Corporation
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ *
+ * Authors:
+ * Eric Anholt <[email protected]>
+ *
+ */
+
+#include <inttypes.h>
+#include <stdbool.h>
+
+#ifndef _HASH_TABLE_H
+#define _HASH_TABLE_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+struct hash_entry {
+ uint32_t hash;
+ const void *key;
+ void *data;
+};
+
+struct hash_table {
+ void *mem_ctx;
+ struct hash_entry *table;
+ bool (*key_equals_function)(const void *a, const void *b);
+ const void *deleted_key;
+ uint32_t size;
+ uint32_t rehash;
+ uint32_t max_entries;
+ uint32_t size_index;
+ uint32_t entries;
+ uint32_t deleted_entries;
+};
+
+struct hash_table *
+_mesa_hash_table_create(void *mem_ctx,
+ bool (*key_equals_function)(const void *a,
+ const void *b));
+void _mesa_hash_table_destroy(struct hash_table *ht,
+ void (*delete_function)(struct hash_entry *entry));
+void _mesa_hash_table_set_deleted_key(struct hash_table *ht,
+ const void *deleted_key);
+
+struct hash_entry *
+_mesa_hash_table_insert(struct hash_table *ht, uint32_t hash,
+ const void *key, void *data);
+struct hash_entry *
+_mesa_hash_table_search(struct hash_table *ht, uint32_t hash,
+ const void *key);
+void _mesa_hash_table_remove(struct hash_table *ht,
+ struct hash_entry *entry);
+
+struct hash_entry *_mesa_hash_table_next_entry(struct hash_table *ht,
+ struct hash_entry *entry);
+struct hash_entry *
+_mesa_hash_table_random_entry(struct hash_table *ht,
+ bool (*predicate)(struct hash_entry *entry));
+
+uint32_t _mesa_hash_data(const void *data, size_t size);
+uint32_t _mesa_hash_string(const char *key);
+bool _mesa_key_string_equal(const void *a, const void *b);
+bool _mesa_key_pointer_equal(const void *a, const void *b);
+
+static inline uint32_t _mesa_hash_pointer(const void *pointer)
+{
+ return _mesa_hash_data(&pointer, sizeof(pointer));
+}
+
+/**
+ * This foreach function is safe against deletion (which just replaces
+ * an entry's data with the deleted marker), but not against insertion
+ * (which may rehash the table, making entry a dangling pointer).
+ */
+#define hash_table_foreach(ht, entry) \
+ for (entry = _mesa_hash_table_next_entry(ht, NULL); \
+ entry != NULL; \
+ entry = _mesa_hash_table_next_entry(ht, entry))
+
+#ifdef __cplusplus
+} /* extern C */
+#endif
+
+#endif /* _HASH_TABLE_H */