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-rw-r--r--src/main.c125
1 files changed, 98 insertions, 27 deletions
diff --git a/src/main.c b/src/main.c
index d7b19bf31..20b4488b0 100644
--- a/src/main.c
+++ b/src/main.c
@@ -329,15 +329,17 @@ int sqlite3_config(int op, ...){
switch( op ){
/* Mutex configuration options are only available in a threadsafe
- ** compile.
+ ** compile.
*/
-#if defined(SQLITE_THREADSAFE) && SQLITE_THREADSAFE>0
+#if defined(SQLITE_THREADSAFE) && SQLITE_THREADSAFE>0 /* IMP: R-54466-46756 */
case SQLITE_CONFIG_SINGLETHREAD: {
/* Disable all mutexing */
sqlite3GlobalConfig.bCoreMutex = 0;
sqlite3GlobalConfig.bFullMutex = 0;
break;
}
+#endif
+#if defined(SQLITE_THREADSAFE) && SQLITE_THREADSAFE>0 /* IMP: R-20520-54086 */
case SQLITE_CONFIG_MULTITHREAD: {
/* Disable mutexing of database connections */
/* Enable mutexing of core data structures */
@@ -345,17 +347,23 @@ int sqlite3_config(int op, ...){
sqlite3GlobalConfig.bFullMutex = 0;
break;
}
+#endif
+#if defined(SQLITE_THREADSAFE) && SQLITE_THREADSAFE>0 /* IMP: R-59593-21810 */
case SQLITE_CONFIG_SERIALIZED: {
/* Enable all mutexing */
sqlite3GlobalConfig.bCoreMutex = 1;
sqlite3GlobalConfig.bFullMutex = 1;
break;
}
+#endif
+#if defined(SQLITE_THREADSAFE) && SQLITE_THREADSAFE>0 /* IMP: R-63666-48755 */
case SQLITE_CONFIG_MUTEX: {
/* Specify an alternative mutex implementation */
sqlite3GlobalConfig.mutex = *va_arg(ap, sqlite3_mutex_methods*);
break;
}
+#endif
+#if defined(SQLITE_THREADSAFE) && SQLITE_THREADSAFE>0 /* IMP: R-14450-37597 */
case SQLITE_CONFIG_GETMUTEX: {
/* Retrieve the current mutex implementation */
*va_arg(ap, sqlite3_mutex_methods*) = sqlite3GlobalConfig.mutex;
@@ -363,37 +371,61 @@ int sqlite3_config(int op, ...){
}
#endif
-
case SQLITE_CONFIG_MALLOC: {
- /* Specify an alternative malloc implementation */
+ /* EVIDENCE-OF: R-55594-21030 The SQLITE_CONFIG_MALLOC option takes a
+ ** single argument which is a pointer to an instance of the
+ ** sqlite3_mem_methods structure. The argument specifies alternative
+ ** low-level memory allocation routines to be used in place of the memory
+ ** allocation routines built into SQLite. */
sqlite3GlobalConfig.m = *va_arg(ap, sqlite3_mem_methods*);
break;
}
case SQLITE_CONFIG_GETMALLOC: {
- /* Retrieve the current malloc() implementation */
+ /* EVIDENCE-OF: R-51213-46414 The SQLITE_CONFIG_GETMALLOC option takes a
+ ** single argument which is a pointer to an instance of the
+ ** sqlite3_mem_methods structure. The sqlite3_mem_methods structure is
+ ** filled with the currently defined memory allocation routines. */
if( sqlite3GlobalConfig.m.xMalloc==0 ) sqlite3MemSetDefault();
*va_arg(ap, sqlite3_mem_methods*) = sqlite3GlobalConfig.m;
break;
}
case SQLITE_CONFIG_MEMSTATUS: {
- /* Enable or disable the malloc status collection */
+ /* EVIDENCE-OF: R-61275-35157 The SQLITE_CONFIG_MEMSTATUS option takes
+ ** single argument of type int, interpreted as a boolean, which enables
+ ** or disables the collection of memory allocation statistics. */
sqlite3GlobalConfig.bMemstat = va_arg(ap, int);
break;
}
case SQLITE_CONFIG_SCRATCH: {
- /* Designate a buffer for scratch memory space */
+ /* EVIDENCE-OF: R-08404-60887 There are three arguments to
+ ** SQLITE_CONFIG_SCRATCH: A pointer an 8-byte aligned memory buffer from
+ ** which the scratch allocations will be drawn, the size of each scratch
+ ** allocation (sz), and the maximum number of scratch allocations (N). */
sqlite3GlobalConfig.pScratch = va_arg(ap, void*);
sqlite3GlobalConfig.szScratch = va_arg(ap, int);
sqlite3GlobalConfig.nScratch = va_arg(ap, int);
break;
}
case SQLITE_CONFIG_PAGECACHE: {
- /* Designate a buffer for page cache memory space */
+ /* EVIDENCE-OF: R-31408-40510 There are three arguments to
+ ** SQLITE_CONFIG_PAGECACHE: A pointer to 8-byte aligned memory, the size
+ ** of each page buffer (sz), and the number of pages (N). */
sqlite3GlobalConfig.pPage = va_arg(ap, void*);
sqlite3GlobalConfig.szPage = va_arg(ap, int);
sqlite3GlobalConfig.nPage = va_arg(ap, int);
break;
}
+ case SQLITE_CONFIG_PCACHE_HDRSZ: {
+ /* EVIDENCE-OF: R-39100-27317 The SQLITE_CONFIG_PCACHE_HDRSZ option takes
+ ** a single parameter which is a pointer to an integer and writes into
+ ** that integer the number of extra bytes per page required for each page
+ ** in SQLITE_CONFIG_PAGECACHE. */
+ *va_arg(ap, int*) =
+ sqlite3HeaderSizeBtree() +
+ sqlite3HeaderSizePcache() +
+ sqlite3HeaderSizePcache1();
+ break;
+ }
case SQLITE_CONFIG_PCACHE: {
/* no-op */
@@ -406,11 +438,18 @@ int sqlite3_config(int op, ...){
}
case SQLITE_CONFIG_PCACHE2: {
- /* Specify an alternative page cache implementation */
+ /* EVIDENCE-OF: R-63325-48378 The SQLITE_CONFIG_PCACHE2 option takes a
+ ** single argument which is a pointer to an sqlite3_pcache_methods2
+ ** object. This object specifies the interface to a custom page cache
+ ** implementation. */
sqlite3GlobalConfig.pcache2 = *va_arg(ap, sqlite3_pcache_methods2*);
break;
}
case SQLITE_CONFIG_GETPCACHE2: {
+ /* EVIDENCE-OF: R-22035-46182 The SQLITE_CONFIG_GETPCACHE2 option takes a
+ ** single argument which is a pointer to an sqlite3_pcache_methods2
+ ** object. SQLite copies of the current page cache implementation into
+ ** that object. */
if( sqlite3GlobalConfig.pcache2.xInit==0 ){
sqlite3PCacheSetDefault();
}
@@ -418,9 +457,14 @@ int sqlite3_config(int op, ...){
break;
}
+/* EVIDENCE-OF: R-06626-12911 The SQLITE_CONFIG_HEAP option is only
+** available if SQLite is compiled with either SQLITE_ENABLE_MEMSYS3 or
+** SQLITE_ENABLE_MEMSYS5 and returns SQLITE_ERROR if invoked otherwise. */
#if defined(SQLITE_ENABLE_MEMSYS3) || defined(SQLITE_ENABLE_MEMSYS5)
case SQLITE_CONFIG_HEAP: {
- /* Designate a buffer for heap memory space */
+ /* EVIDENCE-OF: R-19854-42126 There are three arguments to
+ ** SQLITE_CONFIG_HEAP: An 8-byte aligned pointer to the memory, the
+ ** number of bytes in the memory buffer, and the minimum allocation size. */
sqlite3GlobalConfig.pHeap = va_arg(ap, void*);
sqlite3GlobalConfig.nHeap = va_arg(ap, int);
sqlite3GlobalConfig.mnReq = va_arg(ap, int);
@@ -433,17 +477,19 @@ int sqlite3_config(int op, ...){
}
if( sqlite3GlobalConfig.pHeap==0 ){
- /* If the heap pointer is NULL, then restore the malloc implementation
- ** back to NULL pointers too. This will cause the malloc to go
- ** back to its default implementation when sqlite3_initialize() is
- ** run.
+ /* EVIDENCE-OF: R-49920-60189 If the first pointer (the memory pointer)
+ ** is NULL, then SQLite reverts to using its default memory allocator
+ ** (the system malloc() implementation), undoing any prior invocation of
+ ** SQLITE_CONFIG_MALLOC.
+ **
+ ** Setting sqlite3GlobalConfig.m to all zeros will cause malloc to
+ ** revert to its default implementation when sqlite3_initialize() is run
*/
memset(&sqlite3GlobalConfig.m, 0, sizeof(sqlite3GlobalConfig.m));
}else{
- /* The heap pointer is not NULL, then install one of the
- ** mem5.c/mem3.c methods. The enclosing #if guarantees at
- ** least one of these methods is currently enabled.
- */
+ /* EVIDENCE-OF: R-61006-08918 If the memory pointer is not NULL then the
+ ** alternative memory allocator is engaged to handle all of SQLites
+ ** memory allocation needs. */
#ifdef SQLITE_ENABLE_MEMSYS3
sqlite3GlobalConfig.m = *sqlite3MemGetMemsys3();
#endif
@@ -482,11 +528,19 @@ int sqlite3_config(int op, ...){
** sqlite3_config(SQLITE_CONFIG_URI,0) configuration calls.
*/
case SQLITE_CONFIG_URI: {
+ /* EVIDENCE-OF: R-25451-61125 The SQLITE_CONFIG_URI option takes a single
+ ** argument of type int. If non-zero, then URI handling is globally
+ ** enabled. If the parameter is zero, then URI handling is globally
+ ** disabled. */
sqlite3GlobalConfig.bOpenUri = va_arg(ap, int);
break;
}
case SQLITE_CONFIG_COVERING_INDEX_SCAN: {
+ /* EVIDENCE-OF: R-36592-02772 The SQLITE_CONFIG_COVERING_INDEX_SCAN
+ ** option takes a single integer argument which is interpreted as a
+ ** boolean in order to enable or disable the use of covering indices for
+ ** full table scans in the query optimizer. */
sqlite3GlobalConfig.bUseCis = va_arg(ap, int);
break;
}
@@ -501,20 +555,33 @@ int sqlite3_config(int op, ...){
#endif
case SQLITE_CONFIG_MMAP_SIZE: {
+ /* EVIDENCE-OF: R-58063-38258 SQLITE_CONFIG_MMAP_SIZE takes two 64-bit
+ ** integer (sqlite3_int64) values that are the default mmap size limit
+ ** (the default setting for PRAGMA mmap_size) and the maximum allowed
+ ** mmap size limit. */
sqlite3_int64 szMmap = va_arg(ap, sqlite3_int64);
sqlite3_int64 mxMmap = va_arg(ap, sqlite3_int64);
- if( mxMmap<0 || mxMmap>SQLITE_MAX_MMAP_SIZE ){
- mxMmap = SQLITE_MAX_MMAP_SIZE;
- }
- sqlite3GlobalConfig.mxMmap = mxMmap;
+ /* EVIDENCE-OF: R-53367-43190 If either argument to this option is
+ ** negative, then that argument is changed to its compile-time default.
+ **
+ ** EVIDENCE-OF: R-34993-45031 The maximum allowed mmap size will be
+ ** silently truncated if necessary so that it does not exceed the
+ ** compile-time maximum mmap size set by the SQLITE_MAX_MMAP_SIZE
+ ** compile-time option.
+ */
+ if( mxMmap<0 || mxMmap>SQLITE_MAX_MMAP_SIZE ) mxMmap = SQLITE_MAX_MMAP_SIZE;
if( szMmap<0 ) szMmap = SQLITE_DEFAULT_MMAP_SIZE;
if( szMmap>mxMmap) szMmap = mxMmap;
+ sqlite3GlobalConfig.mxMmap = mxMmap;
sqlite3GlobalConfig.szMmap = szMmap;
break;
}
-#if SQLITE_OS_WIN && defined(SQLITE_WIN32_MALLOC)
+#if SQLITE_OS_WIN && defined(SQLITE_WIN32_MALLOC) /* IMP: R-04780-55815 */
case SQLITE_CONFIG_WIN32_HEAPSIZE: {
+ /* EVIDENCE-OF: R-34926-03360 SQLITE_CONFIG_WIN32_HEAPSIZE takes a 32-bit
+ ** unsigned integer value that specifies the maximum size of the created
+ ** heap. */
sqlite3GlobalConfig.nHeap = va_arg(ap, int);
break;
}
@@ -1044,13 +1111,15 @@ void sqlite3LeaveMutexAndCloseZombie(sqlite3 *db){
/*
** Rollback all database files. If tripCode is not SQLITE_OK, then
-** any open cursors are invalidated ("tripped" - as in "tripping a circuit
+** any write cursors are invalidated ("tripped" - as in "tripping a circuit
** breaker") and made to return tripCode if there are any further
-** attempts to use that cursor.
+** attempts to use that cursor. Read cursors remain open and valid
+** but are "saved" in case the table pages are moved around.
*/
void sqlite3RollbackAll(sqlite3 *db, int tripCode){
int i;
int inTrans = 0;
+ int schemaChange;
assert( sqlite3_mutex_held(db->mutex) );
sqlite3BeginBenignMalloc();
@@ -1061,6 +1130,7 @@ void sqlite3RollbackAll(sqlite3 *db, int tripCode){
** the database rollback and schema reset, which can cause false
** corruption reports in some cases. */
sqlite3BtreeEnterAll(db);
+ schemaChange = (db->flags & SQLITE_InternChanges)!=0 && db->init.busy==0;
for(i=0; i<db->nDb; i++){
Btree *p = db->aDb[i].pBt;
@@ -1068,7 +1138,7 @@ void sqlite3RollbackAll(sqlite3 *db, int tripCode){
if( sqlite3BtreeIsInTrans(p) ){
inTrans = 1;
}
- sqlite3BtreeRollback(p, tripCode);
+ sqlite3BtreeRollback(p, tripCode, !schemaChange);
}
}
sqlite3VtabRollback(db);
@@ -2354,7 +2424,8 @@ int sqlite3ParseUri(
assert( *pzErrMsg==0 );
- if( ((flags & SQLITE_OPEN_URI) || sqlite3GlobalConfig.bOpenUri)
+ if( ((flags & SQLITE_OPEN_URI) /* IMP: R-48725-32206 */
+ || sqlite3GlobalConfig.bOpenUri) /* IMP: R-51689-46548 */
&& nUri>=5 && memcmp(zUri, "file:", 5)==0 /* IMP: R-57884-37496 */
){
char *zOpt;
generated by cgit v1.2.3 (git 2.25.1) at 2025-07-18 19:21:11 +0000