From 4c99e3ae78ed3524d188f00b558f803a943aaa00 Mon Sep 17 00:00:00 2001 From: Jason Ekstrand Date: Thu, 15 Jan 2015 08:06:05 -0800 Subject: util: Move main/set to util/hash_set Reviewed-by: Matt Turner Reviewed-by: Eric Anholt --- src/glsl/nir/nir.h | 2 +- src/mesa/Makefile.sources | 2 - src/mesa/drivers/dri/i965/intel_fbo.c | 2 +- src/mesa/main/set.c | 346 ---------------------------------- src/mesa/main/set.h | 94 --------- src/mesa/main/shared.c | 2 +- src/mesa/main/syncobj.c | 2 +- src/mesa/main/vdpau.c | 2 +- src/util/Makefile.sources | 2 + src/util/set.c | 345 +++++++++++++++++++++++++++++++++ src/util/set.h | 94 +++++++++ 11 files changed, 446 insertions(+), 447 deletions(-) delete mode 100644 src/mesa/main/set.c delete mode 100644 src/mesa/main/set.h create mode 100644 src/util/set.c create mode 100644 src/util/set.h (limited to 'src') diff --git a/src/glsl/nir/nir.h b/src/glsl/nir/nir.h index 1faeb02156c..d5fa0e32623 100644 --- a/src/glsl/nir/nir.h +++ b/src/glsl/nir/nir.h @@ -28,10 +28,10 @@ #pragma once #include "util/hash_table.h" -#include "main/set.h" #include "../list.h" #include "GL/gl.h" /* GLenum */ #include "util/ralloc.h" +#include "util/set.h" #include "main/mtypes.h" #include "main/bitset.h" #include "nir_types.h" diff --git a/src/mesa/Makefile.sources b/src/mesa/Makefile.sources index 2e321f3433c..a91f78cc34e 100644 --- a/src/mesa/Makefile.sources +++ b/src/mesa/Makefile.sources @@ -174,8 +174,6 @@ MAIN_FILES = \ $(SRCDIR)main/samplerobj.h \ $(SRCDIR)main/scissor.c \ $(SRCDIR)main/scissor.h \ - $(SRCDIR)main/set.c \ - $(SRCDIR)main/set.h \ $(SRCDIR)main/shaderapi.c \ $(SRCDIR)main/shaderapi.h \ $(SRCDIR)main/shaderimage.c \ diff --git a/src/mesa/drivers/dri/i965/intel_fbo.c b/src/mesa/drivers/dri/i965/intel_fbo.c index 37ac613fa34..77d128200d9 100644 --- a/src/mesa/drivers/dri/i965/intel_fbo.c +++ b/src/mesa/drivers/dri/i965/intel_fbo.c @@ -36,9 +36,9 @@ #include "main/context.h" #include "main/teximage.h" #include "main/image.h" -#include "main/set.h" #include "main/condrender.h" #include "util/hash_table.h" +#include "util/set.h" #include "swrast/swrast.h" #include "drivers/common/meta.h" diff --git a/src/mesa/main/set.c b/src/mesa/main/set.c deleted file mode 100644 index 52c1dabd82b..00000000000 --- a/src/mesa/main/set.c +++ /dev/null @@ -1,346 +0,0 @@ -/* - * Copyright © 2009-2012 Intel Corporation - * Copyright © 1988-2004 Keith Packard and Bart Massey. - * - * 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. - * - * Except as contained in this notice, the names of the authors - * or their institutions shall not be used in advertising or - * otherwise to promote the sale, use or other dealings in this - * Software without prior written authorization from the - * authors. - * - * Authors: - * Eric Anholt - * Keith Packard - */ - -#include - -#include "macros.h" -#include "set.h" -#include "util/ralloc.h" - -/* - * From Knuth -- a good choice for hash/rehash values is p, p-2 where - * p and p-2 are both prime. These tables are sized to have an extra 10% - * free to avoid exponential performance degradation as the hash table fills - */ - -uint32_t deleted_key_value; -const void *deleted_key = &deleted_key_value; - -static const struct { - uint32_t max_entries, size, rehash; -} hash_sizes[] = { - { 2, 5, 3 }, - { 4, 7, 5 }, - { 8, 13, 11 }, - { 16, 19, 17 }, - { 32, 43, 41 }, - { 64, 73, 71 }, - { 128, 151, 149 }, - { 256, 283, 281 }, - { 512, 571, 569 }, - { 1024, 1153, 1151 }, - { 2048, 2269, 2267 }, - { 4096, 4519, 4517 }, - { 8192, 9013, 9011 }, - { 16384, 18043, 18041 }, - { 32768, 36109, 36107 }, - { 65536, 72091, 72089 }, - { 131072, 144409, 144407 }, - { 262144, 288361, 288359 }, - { 524288, 576883, 576881 }, - { 1048576, 1153459, 1153457 }, - { 2097152, 2307163, 2307161 }, - { 4194304, 4613893, 4613891 }, - { 8388608, 9227641, 9227639 }, - { 16777216, 18455029, 18455027 }, - { 33554432, 36911011, 36911009 }, - { 67108864, 73819861, 73819859 }, - { 134217728, 147639589, 147639587 }, - { 268435456, 295279081, 295279079 }, - { 536870912, 590559793, 590559791 }, - { 1073741824, 1181116273, 1181116271 }, - { 2147483648ul, 2362232233ul, 2362232231ul } -}; - -static int -entry_is_free(struct set_entry *entry) -{ - return entry->key == NULL; -} - -static int -entry_is_deleted(struct set_entry *entry) -{ - return entry->key == deleted_key; -} - -static int -entry_is_present(struct set_entry *entry) -{ - return entry->key != NULL && entry->key != deleted_key; -} - -struct set * -_mesa_set_create(void *mem_ctx, - bool (*key_equals_function)(const void *a, - const void *b)) -{ - struct set *ht; - - ht = ralloc(mem_ctx, struct set); - if (ht == NULL) - return NULL; - - ht->size_index = 0; - ht->size = hash_sizes[ht->size_index].size; - ht->rehash = hash_sizes[ht->size_index].rehash; - ht->max_entries = hash_sizes[ht->size_index].max_entries; - ht->key_equals_function = key_equals_function; - ht->table = rzalloc_array(ht, struct set_entry, ht->size); - ht->entries = 0; - ht->deleted_entries = 0; - - if (ht->table == NULL) { - ralloc_free(ht); - return NULL; - } - - return ht; -} - -/** - * Frees the given set. - * - * If delete_function is passed, it gets called on each entry present before - * freeing. - */ -void -_mesa_set_destroy(struct set *ht, void (*delete_function)(struct set_entry *entry)) -{ - if (!ht) - return; - - if (delete_function) { - struct set_entry *entry; - - set_foreach (ht, entry) { - delete_function(entry); - } - } - ralloc_free(ht->table); - ralloc_free(ht); -} - -/** - * Finds a set entry with the given key and hash of that key. - * - * Returns NULL if no entry is found. - */ -struct set_entry * -_mesa_set_search(const struct set *ht, uint32_t hash, const void *key) -{ - uint32_t hash_address; - - hash_address = hash % ht->size; - do { - uint32_t double_hash; - - struct set_entry *entry = ht->table + hash_address; - - if (entry_is_free(entry)) { - return NULL; - } else if (entry_is_present(entry) && entry->hash == hash) { - if (ht->key_equals_function(key, entry->key)) { - return entry; - } - } - - double_hash = 1 + hash % ht->rehash; - - hash_address = (hash_address + double_hash) % ht->size; - } while (hash_address != hash % ht->size); - - return NULL; -} - -static void -set_rehash(struct set *ht, int new_size_index) -{ - struct set old_ht; - struct set_entry *table, *entry; - - if (new_size_index >= ARRAY_SIZE(hash_sizes)) - return; - - table = rzalloc_array(ht, struct set_entry, - hash_sizes[new_size_index].size); - if (table == NULL) - return; - - old_ht = *ht; - - ht->table = table; - ht->size_index = new_size_index; - ht->size = hash_sizes[ht->size_index].size; - ht->rehash = hash_sizes[ht->size_index].rehash; - ht->max_entries = hash_sizes[ht->size_index].max_entries; - ht->entries = 0; - ht->deleted_entries = 0; - - for (entry = old_ht.table; - entry != old_ht.table + old_ht.size; - entry++) { - if (entry_is_present(entry)) { - _mesa_set_add(ht, entry->hash, entry->key); - } - } - - ralloc_free(old_ht.table); -} - -/** - * Inserts the key with the given hash into the table. - * - * Note that insertion may rearrange the table on a resize or rehash, - * so previously found hash_entries are no longer valid after this function. - */ -struct set_entry * -_mesa_set_add(struct set *ht, uint32_t hash, const void *key) -{ - uint32_t hash_address; - - if (ht->entries >= ht->max_entries) { - set_rehash(ht, ht->size_index + 1); - } else if (ht->deleted_entries + ht->entries >= ht->max_entries) { - set_rehash(ht, ht->size_index); - } - - hash_address = hash % ht->size; - do { - struct set_entry *entry = ht->table + hash_address; - uint32_t double_hash; - - if (!entry_is_present(entry)) { - if (entry_is_deleted(entry)) - ht->deleted_entries--; - entry->hash = hash; - entry->key = key; - ht->entries++; - return entry; - } - - /* Implement replacement when another insert happens - * with a matching key. This is a relatively common - * feature of hash tables, with the alternative - * generally being "insert the new value as well, and - * return it first when the key is searched for". - * - * Note that the hash table doesn't have a delete callback. - * If freeing of old keys is required to avoid memory leaks, - * perform a search before inserting. - */ - if (entry->hash == hash && - ht->key_equals_function(key, entry->key)) { - entry->key = key; - return entry; - } - - double_hash = 1 + hash % ht->rehash; - - hash_address = (hash_address + double_hash) % ht->size; - } while (hash_address != hash % ht->size); - - /* We could hit here if a required resize failed. An unchecked-malloc - * application could ignore this result. - */ - return NULL; -} - -/** - * This function deletes the given hash table entry. - * - * Note that deletion doesn't otherwise modify the table, so an iteration over - * the table deleting entries is safe. - */ -void -_mesa_set_remove(struct set *ht, struct set_entry *entry) -{ - if (!entry) - return; - - entry->key = deleted_key; - ht->entries--; - ht->deleted_entries++; -} - -/** - * This function is an iterator over the hash table. - * - * Pass in NULL for the first entry, as in the start of a for loop. Note that - * an iteration over the table is O(table_size) not O(entries). - */ -struct set_entry * -_mesa_set_next_entry(const struct set *ht, struct set_entry *entry) -{ - if (entry == NULL) - entry = ht->table; - else - entry = entry + 1; - - for (; entry != ht->table + ht->size; entry++) { - if (entry_is_present(entry)) { - return entry; - } - } - - return NULL; -} - -struct set_entry * -_mesa_set_random_entry(struct set *ht, - int (*predicate)(struct set_entry *entry)) -{ - struct set_entry *entry; - uint32_t i = rand() % ht->size; - - if (ht->entries == 0) - return NULL; - - for (entry = ht->table + i; entry != ht->table + ht->size; entry++) { - if (entry_is_present(entry) && - (!predicate || predicate(entry))) { - return entry; - } - } - - for (entry = ht->table; entry != ht->table + i; entry++) { - if (entry_is_present(entry) && - (!predicate || predicate(entry))) { - return entry; - } - } - - return NULL; -} - diff --git a/src/mesa/main/set.h b/src/mesa/main/set.h deleted file mode 100644 index 206d0c4d24f..00000000000 --- a/src/mesa/main/set.h +++ /dev/null @@ -1,94 +0,0 @@ -/* - * 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 - * - */ - -#ifndef _SET_H -#define _SET_H - -#include -#include - -#ifdef __cplusplus -extern "C" { -#endif - -struct set_entry { - uint32_t hash; - const void *key; -}; - -struct set { - void *mem_ctx; - struct set_entry *table; - bool (*key_equals_function)(const void *a, const void *b); - uint32_t size; - uint32_t rehash; - uint32_t max_entries; - uint32_t size_index; - uint32_t entries; - uint32_t deleted_entries; -}; - -struct set * -_mesa_set_create(void *mem_ctx, - bool (*key_equals_function)(const void *a, - const void *b)); -void -_mesa_set_destroy(struct set *set, - void (*delete_function)(struct set_entry *entry)); - -struct set_entry * -_mesa_set_add(struct set *set, uint32_t hash, const void *key); - -struct set_entry * -_mesa_set_search(const struct set *set, uint32_t hash, - const void *key); - -void -_mesa_set_remove(struct set *set, struct set_entry *entry); - -struct set_entry * -_mesa_set_next_entry(const struct set *set, struct set_entry *entry); - -struct set_entry * -_mesa_set_random_entry(struct set *set, - int (*predicate)(struct set_entry *entry)); - -/** - * This foreach function is safe against deletion, but not against - * insertion (which may rehash the set, making entry a dangling - * pointer). - */ -#define set_foreach(set, entry) \ - for (entry = _mesa_set_next_entry(set, NULL); \ - entry != NULL; \ - entry = _mesa_set_next_entry(set, entry)) - -#ifdef __cplusplus -} /* extern C */ -#endif - -#endif /* _SET_H */ diff --git a/src/mesa/main/shared.c b/src/mesa/main/shared.c index f74a8232f43..2389c13159e 100644 --- a/src/mesa/main/shared.c +++ b/src/mesa/main/shared.c @@ -36,12 +36,12 @@ #include "program/program.h" #include "dlist.h" #include "samplerobj.h" -#include "set.h" #include "shaderapi.h" #include "shaderobj.h" #include "syncobj.h" #include "util/hash_table.h" +#include "util/set.h" /** * Allocate and initialize a shared context state structure. diff --git a/src/mesa/main/syncobj.c b/src/mesa/main/syncobj.c index 225399eda3b..8832775ebb8 100644 --- a/src/mesa/main/syncobj.c +++ b/src/mesa/main/syncobj.c @@ -63,8 +63,8 @@ #include "get.h" #include "dispatch.h" #include "mtypes.h" -#include "set.h" #include "util/hash_table.h" +#include "util/set.h" #include "syncobj.h" diff --git a/src/mesa/main/vdpau.c b/src/mesa/main/vdpau.c index fd7561c3db6..89d731b6e74 100644 --- a/src/mesa/main/vdpau.c +++ b/src/mesa/main/vdpau.c @@ -33,9 +33,9 @@ #include #include "util/hash_table.h" +#include "util/set.h" #include "context.h" #include "glformats.h" -#include "set.h" #include "texobj.h" #include "teximage.h" #include "vdpau.h" diff --git a/src/util/Makefile.sources b/src/util/Makefile.sources index 5f87fc32a82..154677aa47d 100644 --- a/src/util/Makefile.sources +++ b/src/util/Makefile.sources @@ -9,6 +9,8 @@ MESA_UTIL_FILES := \ register_allocate.h \ rgtc.c \ rgtc.h \ + set.c \ + set.h \ strtod.cpp \ strtod.h \ texcompress_rgtc_tmp.h \ diff --git a/src/util/set.c b/src/util/set.c new file mode 100644 index 00000000000..3f4a4acb2ce --- /dev/null +++ b/src/util/set.c @@ -0,0 +1,345 @@ +/* + * Copyright © 2009-2012 Intel Corporation + * Copyright © 1988-2004 Keith Packard and Bart Massey. + * + * 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. + * + * Except as contained in this notice, the names of the authors + * or their institutions shall not be used in advertising or + * otherwise to promote the sale, use or other dealings in this + * Software without prior written authorization from the + * authors. + * + * Authors: + * Eric Anholt + * Keith Packard + */ + +#include + +#include "macros.h" +#include "ralloc.h" +#include "set.h" + +/* + * From Knuth -- a good choice for hash/rehash values is p, p-2 where + * p and p-2 are both prime. These tables are sized to have an extra 10% + * free to avoid exponential performance degradation as the hash table fills + */ + +uint32_t deleted_key_value; +const void *deleted_key = &deleted_key_value; + +static const struct { + uint32_t max_entries, size, rehash; +} hash_sizes[] = { + { 2, 5, 3 }, + { 4, 7, 5 }, + { 8, 13, 11 }, + { 16, 19, 17 }, + { 32, 43, 41 }, + { 64, 73, 71 }, + { 128, 151, 149 }, + { 256, 283, 281 }, + { 512, 571, 569 }, + { 1024, 1153, 1151 }, + { 2048, 2269, 2267 }, + { 4096, 4519, 4517 }, + { 8192, 9013, 9011 }, + { 16384, 18043, 18041 }, + { 32768, 36109, 36107 }, + { 65536, 72091, 72089 }, + { 131072, 144409, 144407 }, + { 262144, 288361, 288359 }, + { 524288, 576883, 576881 }, + { 1048576, 1153459, 1153457 }, + { 2097152, 2307163, 2307161 }, + { 4194304, 4613893, 4613891 }, + { 8388608, 9227641, 9227639 }, + { 16777216, 18455029, 18455027 }, + { 33554432, 36911011, 36911009 }, + { 67108864, 73819861, 73819859 }, + { 134217728, 147639589, 147639587 }, + { 268435456, 295279081, 295279079 }, + { 536870912, 590559793, 590559791 }, + { 1073741824, 1181116273, 1181116271 }, + { 2147483648ul, 2362232233ul, 2362232231ul } +}; + +static int +entry_is_free(struct set_entry *entry) +{ + return entry->key == NULL; +} + +static int +entry_is_deleted(struct set_entry *entry) +{ + return entry->key == deleted_key; +} + +static int +entry_is_present(struct set_entry *entry) +{ + return entry->key != NULL && entry->key != deleted_key; +} + +struct set * +_mesa_set_create(void *mem_ctx, + bool (*key_equals_function)(const void *a, + const void *b)) +{ + struct set *ht; + + ht = ralloc(mem_ctx, struct set); + if (ht == NULL) + return NULL; + + ht->size_index = 0; + ht->size = hash_sizes[ht->size_index].size; + ht->rehash = hash_sizes[ht->size_index].rehash; + ht->max_entries = hash_sizes[ht->size_index].max_entries; + ht->key_equals_function = key_equals_function; + ht->table = rzalloc_array(ht, struct set_entry, ht->size); + ht->entries = 0; + ht->deleted_entries = 0; + + if (ht->table == NULL) { + ralloc_free(ht); + return NULL; + } + + return ht; +} + +/** + * Frees the given set. + * + * If delete_function is passed, it gets called on each entry present before + * freeing. + */ +void +_mesa_set_destroy(struct set *ht, void (*delete_function)(struct set_entry *entry)) +{ + if (!ht) + return; + + if (delete_function) { + struct set_entry *entry; + + set_foreach (ht, entry) { + delete_function(entry); + } + } + ralloc_free(ht->table); + ralloc_free(ht); +} + +/** + * Finds a set entry with the given key and hash of that key. + * + * Returns NULL if no entry is found. + */ +struct set_entry * +_mesa_set_search(const struct set *ht, uint32_t hash, const void *key) +{ + uint32_t hash_address; + + hash_address = hash % ht->size; + do { + uint32_t double_hash; + + struct set_entry *entry = ht->table + hash_address; + + if (entry_is_free(entry)) { + return NULL; + } else if (entry_is_present(entry) && entry->hash == hash) { + if (ht->key_equals_function(key, entry->key)) { + return entry; + } + } + + double_hash = 1 + hash % ht->rehash; + + hash_address = (hash_address + double_hash) % ht->size; + } while (hash_address != hash % ht->size); + + return NULL; +} + +static void +set_rehash(struct set *ht, int new_size_index) +{ + struct set old_ht; + struct set_entry *table, *entry; + + if (new_size_index >= ARRAY_SIZE(hash_sizes)) + return; + + table = rzalloc_array(ht, struct set_entry, + hash_sizes[new_size_index].size); + if (table == NULL) + return; + + old_ht = *ht; + + ht->table = table; + ht->size_index = new_size_index; + ht->size = hash_sizes[ht->size_index].size; + ht->rehash = hash_sizes[ht->size_index].rehash; + ht->max_entries = hash_sizes[ht->size_index].max_entries; + ht->entries = 0; + ht->deleted_entries = 0; + + for (entry = old_ht.table; + entry != old_ht.table + old_ht.size; + entry++) { + if (entry_is_present(entry)) { + _mesa_set_add(ht, entry->hash, entry->key); + } + } + + ralloc_free(old_ht.table); +} + +/** + * Inserts the key with the given hash into the table. + * + * Note that insertion may rearrange the table on a resize or rehash, + * so previously found hash_entries are no longer valid after this function. + */ +struct set_entry * +_mesa_set_add(struct set *ht, uint32_t hash, const void *key) +{ + uint32_t hash_address; + + if (ht->entries >= ht->max_entries) { + set_rehash(ht, ht->size_index + 1); + } else if (ht->deleted_entries + ht->entries >= ht->max_entries) { + set_rehash(ht, ht->size_index); + } + + hash_address = hash % ht->size; + do { + struct set_entry *entry = ht->table + hash_address; + uint32_t double_hash; + + if (!entry_is_present(entry)) { + if (entry_is_deleted(entry)) + ht->deleted_entries--; + entry->hash = hash; + entry->key = key; + ht->entries++; + return entry; + } + + /* Implement replacement when another insert happens + * with a matching key. This is a relatively common + * feature of hash tables, with the alternative + * generally being "insert the new value as well, and + * return it first when the key is searched for". + * + * Note that the hash table doesn't have a delete callback. + * If freeing of old keys is required to avoid memory leaks, + * perform a search before inserting. + */ + if (entry->hash == hash && + ht->key_equals_function(key, entry->key)) { + entry->key = key; + return entry; + } + + double_hash = 1 + hash % ht->rehash; + + hash_address = (hash_address + double_hash) % ht->size; + } while (hash_address != hash % ht->size); + + /* We could hit here if a required resize failed. An unchecked-malloc + * application could ignore this result. + */ + return NULL; +} + +/** + * This function deletes the given hash table entry. + * + * Note that deletion doesn't otherwise modify the table, so an iteration over + * the table deleting entries is safe. + */ +void +_mesa_set_remove(struct set *ht, struct set_entry *entry) +{ + if (!entry) + return; + + entry->key = deleted_key; + ht->entries--; + ht->deleted_entries++; +} + +/** + * This function is an iterator over the hash table. + * + * Pass in NULL for the first entry, as in the start of a for loop. Note that + * an iteration over the table is O(table_size) not O(entries). + */ +struct set_entry * +_mesa_set_next_entry(const struct set *ht, struct set_entry *entry) +{ + if (entry == NULL) + entry = ht->table; + else + entry = entry + 1; + + for (; entry != ht->table + ht->size; entry++) { + if (entry_is_present(entry)) { + return entry; + } + } + + return NULL; +} + +struct set_entry * +_mesa_set_random_entry(struct set *ht, + int (*predicate)(struct set_entry *entry)) +{ + struct set_entry *entry; + uint32_t i = rand() % ht->size; + + if (ht->entries == 0) + return NULL; + + for (entry = ht->table + i; entry != ht->table + ht->size; entry++) { + if (entry_is_present(entry) && + (!predicate || predicate(entry))) { + return entry; + } + } + + for (entry = ht->table; entry != ht->table + i; entry++) { + if (entry_is_present(entry) && + (!predicate || predicate(entry))) { + return entry; + } + } + + return NULL; +} diff --git a/src/util/set.h b/src/util/set.h new file mode 100644 index 00000000000..206d0c4d24f --- /dev/null +++ b/src/util/set.h @@ -0,0 +1,94 @@ +/* + * 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 + * + */ + +#ifndef _SET_H +#define _SET_H + +#include +#include + +#ifdef __cplusplus +extern "C" { +#endif + +struct set_entry { + uint32_t hash; + const void *key; +}; + +struct set { + void *mem_ctx; + struct set_entry *table; + bool (*key_equals_function)(const void *a, const void *b); + uint32_t size; + uint32_t rehash; + uint32_t max_entries; + uint32_t size_index; + uint32_t entries; + uint32_t deleted_entries; +}; + +struct set * +_mesa_set_create(void *mem_ctx, + bool (*key_equals_function)(const void *a, + const void *b)); +void +_mesa_set_destroy(struct set *set, + void (*delete_function)(struct set_entry *entry)); + +struct set_entry * +_mesa_set_add(struct set *set, uint32_t hash, const void *key); + +struct set_entry * +_mesa_set_search(const struct set *set, uint32_t hash, + const void *key); + +void +_mesa_set_remove(struct set *set, struct set_entry *entry); + +struct set_entry * +_mesa_set_next_entry(const struct set *set, struct set_entry *entry); + +struct set_entry * +_mesa_set_random_entry(struct set *set, + int (*predicate)(struct set_entry *entry)); + +/** + * This foreach function is safe against deletion, but not against + * insertion (which may rehash the set, making entry a dangling + * pointer). + */ +#define set_foreach(set, entry) \ + for (entry = _mesa_set_next_entry(set, NULL); \ + entry != NULL; \ + entry = _mesa_set_next_entry(set, entry)) + +#ifdef __cplusplus +} /* extern C */ +#endif + +#endif /* _SET_H */ -- cgit v1.2.3