GCC Code Coverage Report

Directory: cvmfs/
File: cvmfs/sqlitemem.cc
Date: 2025-07-21 10:50:29
Exec Total Coverage
Lines: 154 159 96.9%
Branches: 80 122 65.6%
Line Branch Exec Source
1 /**
2 * This file is part of the CernVM File System.
3 */
4
5 #define __STDC_FORMAT_MACROS
6
7
8 #include "sqlitemem.h"
9
10 #include <cassert>
11 #include <cstddef>
12 #include <cstring>
13 #include <new>
14
15 #include "malloc_arena.h"
16 #include "util/concurrency.h"
17 #include "util/exception.h"
18 #include "util/smalloc.h"
19
20 using namespace std; // NOLINT
21
22
23 15649 void *SqliteMemoryManager::LookasideBufferArena::GetBuffer() {
24
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 38256 for (unsigned i = 0; i < kNoBitmaps; ++i) {
25 38115 const int bit_set = ffs(freemap_[i]);
26
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 38115 if (bit_set != 0) {
27 15508 freemap_[i] &= ~(1 << (bit_set - 1)); // set bit to zero
28 15508 const int nbuffer = i * sizeof(int) * 8 + bit_set - 1;
29 15508 return reinterpret_cast<char *>(arena_) + nbuffer * kBufferSize;
30 }
31 }
32 141 return NULL;
33 }
34
35
36 6251 bool SqliteMemoryManager::LookasideBufferArena::IsEmpty() {
37
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 16027 for (unsigned i = 0; i < kNoBitmaps; ++i) {
38
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 15839 if (~freemap_[i] != 0)
39 6063 return false;
40 }
41 188 return true;
42 }
43
44
45 15649 bool SqliteMemoryManager::LookasideBufferArena::Contains(void *buffer) {
46
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 15649 if ((buffer == NULL) || (buffer < arena_))
47 47 return false;
48 15602 return (static_cast<uint64_t>((reinterpret_cast<char *>(buffer)
49 15602 - reinterpret_cast<char *>(arena_)))
50 15602 < kArenaSize);
51 }
52
53
54 1214 SqliteMemoryManager::LookasideBufferArena::LookasideBufferArena()
55 1214 : arena_(sxmmap(kArenaSize)) {
56 // All buffers unused, i.e. all bits set
57 1214 memset(freemap_, 0xFF, kNoBitmaps * sizeof(int));
58 1214 }
59
60
61 1210 SqliteMemoryManager::LookasideBufferArena::~LookasideBufferArena() {
62 1210 sxunmap(arena_, kArenaSize);
63 1210 }
64
65
66 15508 void SqliteMemoryManager::LookasideBufferArena::PutBuffer(void *buffer) {
67
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 15508 assert(buffer >= arena_);
68 15508 const ptrdiff_t nbuffer = (reinterpret_cast<char *>(buffer)
69 15508 - reinterpret_cast<char *>(arena_))
70 / kBufferSize;
71
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 15508 assert(static_cast<uint64_t>(nbuffer) < kBuffersPerArena);
72 15508 const int nfreemap = nbuffer / (sizeof(int) * 8);
73 15508 freemap_[nfreemap] |= 1 << (nbuffer % (sizeof(int) * 8));
74 15508 }
75
76
77 //------------------------------------------------------------------------------
78
79
80 SqliteMemoryManager *SqliteMemoryManager::instance_ = NULL;
81
82
83 /**
84 * Sqlite ensures that size > 0.
85 */
86 1314663 void *SqliteMemoryManager::xMalloc(int size) {
87 1314663 return instance_->GetMemory(size);
88 }
89
90
91 /**
92 * Sqlite ensures that ptr != NULL.
93 */
94 1314570 void SqliteMemoryManager::xFree(void *ptr) { instance_->PutMemory(ptr); }
95
96
97 /**
98 * Sqlite ensures that ptr != NULL and new_size > 0.
99 */
100 972179 void *SqliteMemoryManager::xRealloc(void *ptr, int new_size) {
101 972179 const int old_size = xSize(ptr);
102
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 972179 if (old_size >= new_size)
103 23617 return ptr;
104
105 948562 void *new_ptr = xMalloc(new_size);
106 948562 memcpy(new_ptr, ptr, old_size);
107 948562 xFree(ptr);
108 948562 return new_ptr;
109 }
110
111
112 /**
113 * Sqlite ensures that ptr != NULL.
114 */
115 1789074 int SqliteMemoryManager::xSize(void *ptr) {
116 1789074 return instance_->GetMemorySize(ptr);
117 }
118
119
120 398233 int SqliteMemoryManager::xRoundup(int size) { return RoundUp8(size); }
121
122
123 885 int SqliteMemoryManager::xInit(void *app_data __attribute__((unused))) {
124 885 return SQLITE_OK;
125 }
126
127
128 881 void SqliteMemoryManager::xShutdown(void *app_data __attribute__((unused))) { }
129
130
131 885 void SqliteMemoryManager::AssignGlobalArenas() {
132
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 885 if (assigned_)
133 ✗ return;
134 int retval;
135
136 885 retval = sqlite3_config(SQLITE_CONFIG_PAGECACHE, page_cache_memory_,
137 kPageCacheSlotSize, kPageCacheNoSlots);
138
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 885 assert(retval == SQLITE_OK);
139
140 885 retval = sqlite3_config(SQLITE_CONFIG_GETMALLOC, &sqlite3_mem_vanilla_);
141
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 885 assert(retval == SQLITE_OK);
142 885 retval = sqlite3_config(SQLITE_CONFIG_MALLOC, &mem_methods_);
143
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 885 assert(retval == SQLITE_OK);
144
145 885 assigned_ = true;
146 }
147
148
149 /**
150 * Needs to be the first operation on an opened sqlite database. Returns the
151 * location of the buffer.
152 */
153 374 void *SqliteMemoryManager::AssignLookasideBuffer(sqlite3 *db) {
154 374 const MutexLockGuard lock_guard(lock_);
155
156
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 374 void *buffer = GetLookasideBuffer();
157
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 374 assert(buffer != NULL);
158
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 374 const int retval = sqlite3_db_config(db, SQLITE_DBCONFIG_LOOKASIDE, buffer,
159 kLookasideSlotSize,
160 kLookasideSlotsPerDb);
161
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 374 assert(retval == SQLITE_OK);
162 374 return buffer;
163 374 }
164
165
166 1116 void SqliteMemoryManager::CleanupInstance() {
167
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 1116 delete instance_;
168 1116 instance_ = NULL;
169 1116 }
170
171
172 /**
173 * Opens a new arena if necessary.
174 */
175 6437 void *SqliteMemoryManager::GetLookasideBuffer() {
176 void *result;
177 vector<LookasideBufferArena *>::reverse_iterator
178 6437 reverse_iter = lookaside_buffer_arenas_.rbegin();
179 const vector<LookasideBufferArena *>::reverse_iterator
180 6437 i_rend = lookaside_buffer_arenas_.rend();
181
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 6484 for (; reverse_iter != i_rend; ++reverse_iter) {
182 6437 result = (*reverse_iter)->GetBuffer();
183
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 6437 if (result != NULL)
184 6390 return result;
185 }
186
187
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 47 LookasideBufferArena *new_arena = new LookasideBufferArena();
188
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 47 lookaside_buffer_arenas_.push_back(new_arena);
189 47 return new_arena->GetBuffer();
190 }
191
192
193 1789262 int SqliteMemoryManager::GetMemorySize(void *ptr) {
194 1789262 return MallocArena::GetMallocArena(ptr, kArenaSize)->GetSize(ptr);
195 }
196
197
198 /**
199 * Opens new arenas as necessary.
200 */
201 2254945 void *SqliteMemoryManager::GetMemory(int size) {
202
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 2254945 void *p = malloc_arenas_[idx_last_arena_]->Malloc(size);
203
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 2254945 if (p != NULL)
204 2254898 return p;
205 47 const unsigned N = malloc_arenas_.size();
206
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 94 for (unsigned i = 0; i < N; ++i) {
207
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 47 p = malloc_arenas_[i]->Malloc(size);
208
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 47 if (p != NULL) {
209 ✗ idx_last_arena_ = i;
210 ✗ return p;
211 }
212 }
213 47 idx_last_arena_ = N;
214
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 47 MallocArena *M = new MallocArena(kArenaSize);
215
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 47 malloc_arenas_.push_back(M);
216
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 47 p = M->Malloc(size);
217
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 47 assert(p != NULL);
218 47 return p;
219 }
220
221
222 1120 SqliteMemoryManager::SqliteMemoryManager()
223 1120 : assigned_(false)
224 1120 , page_cache_memory_(sxmmap(kPageCacheSize))
225 1120 , idx_last_arena_(0) {
226 1120 memset(&sqlite3_mem_vanilla_, 0, sizeof(sqlite3_mem_vanilla_));
227 1120 const int retval = pthread_mutex_init(&lock_, NULL);
228
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 1120 assert(retval == 0);
229
230
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 1120 lookaside_buffer_arenas_.push_back(new LookasideBufferArena());
231
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 1120 malloc_arenas_.push_back(new MallocArena(kArenaSize));
232
233 1120 memset(&mem_methods_, 0, sizeof(mem_methods_));
234 1120 mem_methods_.xMalloc = xMalloc;
235 1120 mem_methods_.xFree = xFree;
236 1120 mem_methods_.xRealloc = xRealloc;
237 1120 mem_methods_.xSize = xSize;
238 1120 mem_methods_.xRoundup = xRoundup;
239 1120 mem_methods_.xInit = xInit;
240 1120 mem_methods_.xShutdown = xShutdown;
241 1120 mem_methods_.pAppData = NULL;
242 1120 }
243
244
245 /**
246 * Must be executed only after sqlite3_shutdown.
247 */
248 1116 SqliteMemoryManager::~SqliteMemoryManager() {
249
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 1116 if (assigned_) {
250 // Reset sqlite to default values
251 int retval;
252 881 retval = sqlite3_config(SQLITE_CONFIG_PAGECACHE, NULL, 0, 0);
253
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 881 assert(retval == SQLITE_OK);
254 881 retval = sqlite3_config(SQLITE_CONFIG_MALLOC, &sqlite3_mem_vanilla_);
255
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 881 assert(retval == SQLITE_OK);
256 }
257
258 1116 sxunmap(page_cache_memory_, kPageCacheSize);
259
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 2232 for (unsigned i = 0; i < lookaside_buffer_arenas_.size(); ++i)
260
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 1116 delete lookaside_buffer_arenas_[i];
261
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 2232 for (unsigned i = 0; i < malloc_arenas_.size(); ++i)
262
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 1116 delete malloc_arenas_[i];
263 1116 pthread_mutex_destroy(&lock_);
264 1116 }
265
266
267 /**
268 * Only entirely empty arenas are freed to the system. In cvmfs, catalogs
269 * are gradually opened and sometimes close altogether when a new root catalog
270 * arrives. Hence there is no fragmentation.
271 */
272 6437 void SqliteMemoryManager::PutLookasideBuffer(void *buffer) {
273 6437 const unsigned N = lookaside_buffer_arenas_.size();
274
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 6437 for (unsigned i = 0; i < N; ++i) {
275
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 6437 if (lookaside_buffer_arenas_[i]->Contains(buffer)) {
276 6437 lookaside_buffer_arenas_[i]->PutBuffer(buffer);
277
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 6437 if ((N > 1) && lookaside_buffer_arenas_[i]->IsEmpty()) {
278
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 47 delete lookaside_buffer_arenas_[i];
279
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 47 lookaside_buffer_arenas_.erase(lookaside_buffer_arenas_.begin() + i);
280 }
281 6437 return;
282 }
283 }
284 ✗ PANIC(NULL);
285 }
286
287
288 /**
289 * Closes empty areas.
290 */
291 1314758 void SqliteMemoryManager::PutMemory(void *ptr) {
292 1314758 MallocArena *M = MallocArena::GetMallocArena(ptr, kArenaSize);
293 1314758 M->Free(ptr);
294 1314758 const unsigned N = malloc_arenas_.size();
295
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 1314758 if ((N > 1) && M->IsEmpty()) {
296
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 94 for (unsigned i = 0; i < N; ++i) {
297
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 94 if (malloc_arenas_[i] == M) {
298
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 47 delete malloc_arenas_[i];
299
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 47 malloc_arenas_.erase(malloc_arenas_.begin() + i);
300 47 idx_last_arena_ = 0;
301 47 return;
302 }
303 }
304 ✗ PANIC(NULL);
305 }
306 }
307
308
309 /**
310 * To be used after an sqlite database has been closed.
311 */
312 374 void SqliteMemoryManager::ReleaseLookasideBuffer(void *buffer) {
313 374 const MutexLockGuard lock_guard(lock_);
314
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 374 PutLookasideBuffer(buffer);
315 374 }
316