1 /*
2 +----------------------------------------------------------------------+
3 | Zend OPcache |
4 +----------------------------------------------------------------------+
5 | Copyright (c) 1998-2018 The PHP Group |
6 +----------------------------------------------------------------------+
7 | This source file is subject to version 3.01 of the PHP license, |
8 | that is bundled with this package in the file LICENSE, and is |
9 | available through the world-wide-web at the following url: |
10 | http://www.php.net/license/3_01.txt |
11 | If you did not receive a copy of the PHP license and are unable to |
12 | obtain it through the world-wide-web, please send a note to |
13 | license@php.net so we can mail you a copy immediately. |
14 +----------------------------------------------------------------------+
15 | Authors: Andi Gutmans <andi@zend.com> |
16 | Zeev Suraski <zeev@zend.com> |
17 | Stanislav Malyshev <stas@zend.com> |
18 | Dmitry Stogov <dmitry@zend.com> |
19 +----------------------------------------------------------------------+
20 */
21
22 #include "ZendAccelerator.h"
23 #include "zend_accelerator_hash.h"
24 #include "zend_hash.h"
25 #include "zend_shared_alloc.h"
26
27 /* Generated on an Octa-ALPHA 300MHz CPU & 2.5GB RAM monster */
28 static uint prime_numbers[] =
29 {5, 11, 19, 53, 107, 223, 463, 983, 1979, 3907, 7963, 16229, 32531, 65407, 130987, 262237, 524521, 1048793 };
30 static uint num_prime_numbers = sizeof(prime_numbers) / sizeof(uint);
31
zend_accel_hash_clean(zend_accel_hash * accel_hash)32 void zend_accel_hash_clean(zend_accel_hash *accel_hash)
33 {
34 accel_hash->num_entries = 0;
35 accel_hash->num_direct_entries = 0;
36 memset(accel_hash->hash_table, 0, sizeof(zend_accel_hash_entry *)*accel_hash->max_num_entries);
37 }
38
zend_accel_hash_init(zend_accel_hash * accel_hash,uint32_t hash_size)39 void zend_accel_hash_init(zend_accel_hash *accel_hash, uint32_t hash_size)
40 {
41 uint i;
42
43 for (i=0; i<num_prime_numbers; i++) {
44 if (hash_size <= prime_numbers[i]) {
45 hash_size = prime_numbers[i];
46 break;
47 }
48 }
49
50 accel_hash->num_entries = 0;
51 accel_hash->num_direct_entries = 0;
52 accel_hash->max_num_entries = hash_size;
53
54 /* set up hash pointers table */
55 accel_hash->hash_table = zend_shared_alloc(sizeof(zend_accel_hash_entry *)*accel_hash->max_num_entries);
56 if (!accel_hash->hash_table) {
57 zend_accel_error(ACCEL_LOG_FATAL, "Insufficient shared memory!");
58 return;
59 }
60
61 /* set up hash values table */
62 accel_hash->hash_entries = zend_shared_alloc(sizeof(zend_accel_hash_entry)*accel_hash->max_num_entries);
63 if (!accel_hash->hash_entries) {
64 zend_accel_error(ACCEL_LOG_FATAL, "Insufficient shared memory!");
65 return;
66 }
67 memset(accel_hash->hash_table, 0, sizeof(zend_accel_hash_entry *)*accel_hash->max_num_entries);
68 }
69
70 /* Returns NULL if hash is full
71 * Returns pointer the actual hash entry on success
72 * key needs to be already allocated as it is not copied
73 */
zend_accel_hash_update(zend_accel_hash * accel_hash,char * key,uint32_t key_length,zend_bool indirect,void * data)74 zend_accel_hash_entry* zend_accel_hash_update(zend_accel_hash *accel_hash, char *key, uint32_t key_length, zend_bool indirect, void *data)
75 {
76 zend_ulong hash_value;
77 zend_ulong index;
78 zend_accel_hash_entry *entry;
79 zend_accel_hash_entry *indirect_bucket = NULL;
80
81 if (indirect) {
82 indirect_bucket = (zend_accel_hash_entry*)data;
83 while (indirect_bucket->indirect) {
84 indirect_bucket = (zend_accel_hash_entry*)indirect_bucket->data;
85 }
86 }
87
88 hash_value = zend_inline_hash_func(key, key_length);
89 #ifndef ZEND_WIN32
90 hash_value ^= ZCG(root_hash);
91 #endif
92 index = hash_value % accel_hash->max_num_entries;
93
94 /* try to see if the element already exists in the hash */
95 entry = accel_hash->hash_table[index];
96 while (entry) {
97 if (entry->hash_value == hash_value
98 && entry->key_length == key_length
99 && !memcmp(entry->key, key, key_length)) {
100
101 if (entry->indirect) {
102 if (indirect_bucket) {
103 entry->data = indirect_bucket;
104 } else {
105 ((zend_accel_hash_entry*)entry->data)->data = data;
106 }
107 } else {
108 if (indirect_bucket) {
109 accel_hash->num_direct_entries--;
110 entry->data = indirect_bucket;
111 entry->indirect = 1;
112 } else {
113 entry->data = data;
114 }
115 }
116 return entry;
117 }
118 entry = entry->next;
119 }
120
121 /* Does not exist, add a new entry */
122 if (accel_hash->num_entries == accel_hash->max_num_entries) {
123 return NULL;
124 }
125
126 entry = &accel_hash->hash_entries[accel_hash->num_entries++];
127 if (indirect) {
128 entry->data = indirect_bucket;
129 entry->indirect = 1;
130 } else {
131 accel_hash->num_direct_entries++;
132 entry->data = data;
133 entry->indirect = 0;
134 }
135 entry->hash_value = hash_value;
136 entry->key = key;
137 entry->key_length = key_length;
138 entry->next = accel_hash->hash_table[index];
139 accel_hash->hash_table[index] = entry;
140 return entry;
141 }
142
zend_accel_hash_find_ex(zend_accel_hash * accel_hash,char * key,uint32_t key_length,zend_ulong hash_value,int data)143 static zend_always_inline void* zend_accel_hash_find_ex(zend_accel_hash *accel_hash, char *key, uint32_t key_length, zend_ulong hash_value, int data)
144 {
145 zend_ulong index;
146 zend_accel_hash_entry *entry;
147
148 #ifndef ZEND_WIN32
149 hash_value ^= ZCG(root_hash);
150 #endif
151 index = hash_value % accel_hash->max_num_entries;
152
153 entry = accel_hash->hash_table[index];
154 while (entry) {
155 if (entry->hash_value == hash_value
156 && entry->key_length == key_length
157 && !memcmp(entry->key, key, key_length)) {
158 if (entry->indirect) {
159 if (data) {
160 return ((zend_accel_hash_entry*)entry->data)->data;
161 } else {
162 return entry->data;
163 }
164 } else {
165 if (data) {
166 return entry->data;
167 } else {
168 return entry;
169 }
170 }
171 }
172 entry = entry->next;
173 }
174 return NULL;
175 }
176
177 /* Returns the data associated with key on success
178 * Returns NULL if data doesn't exist
179 */
zend_accel_hash_find(zend_accel_hash * accel_hash,zend_string * key)180 void* zend_accel_hash_find(zend_accel_hash *accel_hash, zend_string *key)
181 {
182 return zend_accel_hash_find_ex(
183 accel_hash,
184 ZSTR_VAL(key),
185 ZSTR_LEN(key),
186 zend_string_hash_val(key),
187 1);
188 }
189
190 /* Returns the hash entry associated with key on success
191 * Returns NULL if it doesn't exist
192 */
zend_accel_hash_find_entry(zend_accel_hash * accel_hash,zend_string * key)193 zend_accel_hash_entry* zend_accel_hash_find_entry(zend_accel_hash *accel_hash, zend_string *key)
194 {
195 return (zend_accel_hash_entry *)zend_accel_hash_find_ex(
196 accel_hash,
197 ZSTR_VAL(key),
198 ZSTR_LEN(key),
199 zend_string_hash_val(key),
200 0);
201 }
202
203 /* Returns the data associated with key on success
204 * Returns NULL if data doesn't exist
205 */
zend_accel_hash_str_find(zend_accel_hash * accel_hash,char * key,uint32_t key_length)206 void* zend_accel_hash_str_find(zend_accel_hash *accel_hash, char *key, uint32_t key_length)
207 {
208 return zend_accel_hash_find_ex(
209 accel_hash,
210 key,
211 key_length,
212 zend_inline_hash_func(key, key_length),
213 1);
214 }
215
216 /* Returns the hash entry associated with key on success
217 * Returns NULL if it doesn't exist
218 */
zend_accel_hash_str_find_entry(zend_accel_hash * accel_hash,char * key,uint32_t key_length)219 zend_accel_hash_entry* zend_accel_hash_str_find_entry(zend_accel_hash *accel_hash, char *key, uint32_t key_length)
220 {
221 return (zend_accel_hash_entry *)zend_accel_hash_find_ex(
222 accel_hash,
223 key,
224 key_length,
225 zend_inline_hash_func(key, key_length),
226 0);
227 }
228
zend_accel_hash_unlink(zend_accel_hash * accel_hash,char * key,uint32_t key_length)229 int zend_accel_hash_unlink(zend_accel_hash *accel_hash, char *key, uint32_t key_length)
230 {
231 zend_ulong hash_value;
232 zend_ulong index;
233 zend_accel_hash_entry *entry, *last_entry=NULL;
234
235 hash_value = zend_inline_hash_func(key, key_length);
236 #ifndef ZEND_WIN32
237 hash_value ^= ZCG(root_hash);
238 #endif
239 index = hash_value % accel_hash->max_num_entries;
240
241 entry = accel_hash->hash_table[index];
242 while (entry) {
243 if (entry->hash_value == hash_value
244 && entry->key_length == key_length
245 && !memcmp(entry->key, key, key_length)) {
246 if (!entry->indirect) {
247 accel_hash->num_direct_entries--;
248 }
249 if (last_entry) {
250 last_entry->next = entry->next;
251 } else {
252 accel_hash->hash_table[index] = entry->next;
253 }
254 return SUCCESS;
255 }
256 last_entry = entry;
257 entry = entry->next;
258 }
259 return FAILURE;
260 }
261
