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920 lines (874 loc) · 26.8 KB
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/*
** 2001 September 15
**
** The author disclaims copyright to this source code. In place of
** a legal notice, here is a blessing:
**
** May you do good and not evil.
** May you find forgiveness for yourself and forgive others.
** May you share freely, never taking more than you give.
**
*************************************************************************
**
** Memory allocation functions used throughout sqlite.
*/
#include "sqliteInt.h"
#include <stdarg.h>
/*
** Attempt to release up to n bytes of non-essential memory currently
** held by SQLite. An example of non-essential memory is memory used to
** cache database pages that are not currently in use.
*/
int sqlite3_release_memory(int n){
#ifdef SQLITE_ENABLE_MEMORY_MANAGEMENT
return sqlite3PcacheReleaseMemory(n);
#else
/* IMPLEMENTATION-OF: R-34391-24921 The sqlite3_release_memory() routine
** is a no-op returning zero if SQLite is not compiled with
** SQLITE_ENABLE_MEMORY_MANAGEMENT. */
UNUSED_PARAMETER(n);
return 0;
#endif
}
/*
** Default value of the hard heap limit. 0 means "no limit".
*/
#ifndef SQLITE_MAX_MEMORY
# define SQLITE_MAX_MEMORY 0
#endif
/*
** State infor
10000
mation local to the memory allocation subsystem.
*/
static SQLITE_WSD struct Mem0Global {
sqlite3_mutex *mutex; /* Mutex to serialize access */
sqlite3_int64 alarmThreshold; /* The soft heap limit */
sqlite3_int64 hardLimit; /* The hard upper bound on memory */
/*
** True if heap is nearly "full" where "full" is defined by the
** sqlite3_soft_heap_limit() setting.
*/
int nearlyFull;
} mem0 = { 0, SQLITE_MAX_MEMORY, SQLITE_MAX_MEMORY, 0 };
#define mem0 GLOBAL(struct Mem0Global, mem0)
/*
** Return the memory allocator mutex. sqlite3_status() needs it.
*/
sqlite3_mutex *sqlite3MallocMutex(void){
return mem0.mutex;
}
#ifndef SQLITE_OMIT_DEPRECATED
/*
** Deprecated external interface. It used to set an alarm callback
** that was invoked when memory usage grew too large. Now it is a
** no-op.
*/
int sqlite3_memory_alarm(
void(*xCallback)(void *pArg, sqlite3_int64 used,int N),
void *pArg,
sqlite3_int64 iThreshold
){
(void)xCallback;
(void)pArg;
(void)iThreshold;
return SQLITE_OK;
}
#endif
/*
** Set the soft heap-size limit for the library. An argument of
** zero disables the limit. A negative argument is a no-op used to
** obtain the return value.
**
** The return value is the value of the heap limit just before this
** interface was called.
**
** If the hard heap limit is enabled, then the soft heap limit cannot
** be disabled nor raised above the hard heap limit.
*/
sqlite3_int64 sqlite3_soft_heap_limit64(sqlite3_int64 n){
sqlite3_int64 priorLimit;
sqlite3_int64 excess;
sqlite3_int64 nUsed;
#ifndef SQLITE_OMIT_AUTOINIT
int rc = sqlite3_initialize();
if( rc ) return -1;
#endif
sqlite3_mutex_enter(mem0.mutex);
priorLimit = mem0.alarmThreshold;
if( n<0 ){
sqlite3_mutex_leave(mem0.mutex);
return priorLimit;
}
if( mem0.hardLimit>0 && (n>mem0.hardLimit || n==0) ){
n = mem0.hardLimit;
}
mem0.alarmThreshold = n;
nUsed = sqlite3StatusValue(SQLITE_STATUS_MEMORY_USED);
AtomicStore(&mem0.nearlyFull, n>0 && n<=nUsed);
sqlite3_mutex_leave(mem0.mutex);
excess = sqlite3_memory_used() - n;
if( excess>0 ) sqlite3_release_memory((int)(excess & 0x7fffffff));
return priorLimit;
}
void sqlite3_soft_heap_limit(int n){
if( n<0 ) n = 0;
sqlite3_soft_heap_limit64(n);
}
/*
** Set the hard heap-size limit for the library. An argument of zero
** disables the hard heap limit. A negative argument is a no-op used
** to obtain the return value without affecting the hard heap limit.
**
** The return value is the value of the hard heap limit just prior to
** calling this interface.
**
** Setting the hard heap limit will also activate the soft heap limit
** and constrain the soft heap limit to be no more than the hard heap
** limit.
*/
sqlite3_int64 sqlite3_hard_heap_limit64(sqlite3_int64 n){
sqlite3_int64 priorLimit;
#ifndef SQLITE_OMIT_AUTOINIT
int rc = sqlite3_initialize();
if( rc ) return -1;
#endif
sqlite3_mutex_enter(mem0.mutex);
priorLimit = mem0.hardLimit;
if( n>=0 ){
mem0.hardLimit = n;
if( n<mem0.alarmThreshold || mem0.alarmThreshold==0 ){
mem0.alarmThreshold = n;
}
}
sqlite3_mutex_leave(mem0.mutex);
return priorLimit;
}
/*
** Initialize the memory allocation subsystem.
*/
int sqlite3MallocInit(void){
int rc;
if( sqlite3GlobalConfig.m.xMalloc==0 ){
sqlite3MemSetDefault();
}
mem0.mutex = sqlite3MutexAlloc(SQLITE_MUTEX_STATIC_MEM);
if( sqlite3GlobalConfig.pPage==0 || sqlite3GlobalConfig.szPage<512
|| sqlite3GlobalConfig.nPage<=0 ){
sqlite3GlobalConfig.pPage = 0;
sqlite3GlobalConfig.szPage = 0;
}
rc = sqlite3GlobalConfig.m.xInit(sqlite3GlobalConfig.m.pAppData);
if( rc!=SQLITE_OK ) memset(&mem0, 0, sizeof(mem0));
return rc;
}
/*
** Return true if the heap is currently under memory pressure - in other
** words if the amount of heap used is close to the limit set by
** sqlite3_soft_heap_limit().
*/
int sqlite3HeapNearlyFull(void){
return AtomicLoad(&mem0.nearlyFull);
}
/*
** Deinitialize the memory allocation subsystem.
*/
void sqlite3MallocEnd(void){
if( sqlite3GlobalConfig.m.xShutdown ){
sqlite3GlobalConfig.m.xShutdown(sqlite3GlobalConfig.m.pAppData);
}
memset(&mem0, 0, sizeof(mem0));
}
/*
** Return the amount of memory currently checked out.
*/
sqlite3_int64 sqlite3_memory_used(void){
sqlite3_int64 res, mx;
sqlite3_status64(SQLITE_STATUS_MEMORY_USED, &res, &mx, 0);
return res;
}
/*
** Return the maximum amount of memory that has ever been
** checked out since either the beginning of this process
** or since the most recent reset.
*/
sqlite3_int64 sqlite3_memory_highwater(int resetFlag){
sqlite3_int64 res, mx;
sqlite3_status64(SQLITE_STATUS_MEMORY_USED, &res, &mx, resetFlag);
return mx;
}
/*
** Trigger the alarm
*/
static void sqlite3MallocAlarm(int nByte){
if( mem0.alarmThreshold<=0 ) return;
sqlite3_mutex_leave(mem0.mutex);
sqlite3_release_memory(nByte);
sqlite3_mutex_enter(mem0.mutex);
}
#ifdef SQLITE_DEBUG
/*
** This routine is called whenever an out-of-memory condition is seen,
** It's only purpose to to serve as a breakpoint for gdb or similar
** code debuggers when working on out-of-memory conditions, for example
** caused by PRAGMA hard_heap_limit=N.
*/
static SQLITE_NOINLINE void test_oom_breakpoint(u64 n){
static u64 nOomFault = 0;
nOomFault += n;
/* The assert() is never reached in a human lifetime. It is here mostly
** to prevent code optimizers from optimizing out this function. */
assert( (nOomFault>>32) < 0xffffffff );
}
#else
# define test_oom_breakpoint(X) /* No-op for production builds */
#endif
/*
** Do a memory allocation with statistics and alarms. Assume the
** lock is already held.
*/
static void mallocWithAlarm(int n, void **pp){
void *p;
int nFull;
assert( sqlite3_mutex_held(mem0.mutex) );
assert( n>0 );
/* In Firefox (circa 2017-02-08), xRoundup() is remapped to an internal
** implementation of malloc_good_size(), which must be called in debug
** mode and specifically when the DMD "Dark Matter Detector" is enabled
** or else a crash results. Hence, do not attempt to optimize out the
** following xRoundup() call. */
nFull = sqlite3GlobalConfig.m.xRoundup(n);
sqlite3StatusHighwater(SQLITE_STATUS_MALLOC_SIZE, n);
if( mem0.alarmThreshold>0 ){
sqlite3_int64 nUsed = sqlite3StatusValue(SQLITE_STATUS_MEMORY_USED);
if( nUsed >= mem0.alarmThreshold - nFull ){
AtomicStore(&mem0.nearlyFull, 1);
sqlite3MallocAlarm(nFull);
if( mem0.hardLimit ){
nUsed = sqlite3StatusValue(SQLITE_STATUS_MEMORY_USED);
if( nUsed >= mem0.hardLimit - nFull ){
test_oom_breakpoint(1);
*pp = 0;
return;
}
}
}else{
AtomicStore(&mem0.nearlyFull, 0);
}
}
p = sqlite3GlobalConfig.m.xMalloc(nFull);
#ifdef SQLITE_ENABLE_MEMORY_MANAGEMENT
if( p==0 && mem0.alarmThreshold>0 ){
sqlite3MallocAlarm(nFull);
p = sqlite3GlobalConfig.m.xMalloc(nFull);
}
#endif
if( p ){
nFull = sqlite3MallocSize(p);
sqlite3StatusUp(SQLITE_STATUS_MEMORY_USED, nFull);
sqlite3StatusUp(SQLITE_STATUS_MALLOC_COUNT, 1);
}
*pp = p;
}
/*
** Maximum size of any single memory allocation.
**
** This is not a limit on the total amount of memory used. This is
** a limit on the size parameter to sqlite3_malloc() and sqlite3_realloc().
**
** The upper bound is slightly less than 2GiB: 0x7ffffeff == 2,147,483,391
** This provides a 256-byte safety margin for defense against 32-bit
** signed integer overflow bugs when computing memory allocation sizes.
** Paranoid applications might want to reduce the maximum allocation size
** further for an even larger safety margin. 0x3fffffff or 0x0fffffff
** or even s
528C
maller would be reasonable upper bounds on the size of a memory
** allocations for most applications.
*/
#ifndef SQLITE_MAX_ALLOCATION_SIZE
# define SQLITE_MAX_ALLOCATION_SIZE 2147483391
#endif
#if SQLITE_MAX_ALLOCATION_SIZE>2147483391
# error Maximum size for SQLITE_MAX_ALLOCATION_SIZE is 2147483391
#endif
/*
** Allocate memory. This routine is like sqlite3_malloc() except that it
** assumes the memory subsystem has already been initialized.
*/
void *sqlite3Malloc(u64 n){
void *p;
if( n==0 || n>SQLITE_MAX_ALLOCATION_SIZE ){
p = 0;
}else if( sqlite3GlobalConfig.bMemstat ){
sqlite3_mutex_enter(mem0.mutex);
mallocWithAlarm((int)n, &p);
sqlite3_mutex_leave(mem0.mutex);
}else{
p = sqlite3GlobalConfig.m.xMalloc((int)n);
}
assert( EIGHT_BYTE_ALIGNMENT(p) ); /* IMP: R-11148-40995 */
return p;
}
/*
** This version of the memory allocation is for use by the application.
** First make sure the memory subsystem is initialized, then do the
** allocation.
*/
void *sqlite3_malloc(int n){
#ifndef SQLITE_OMIT_AUTOINIT
if( sqlite3_initialize() ) return 0;
#endif
return n<=0 ? 0 : sqlite3Malloc(n);
}
void *sqlite3_malloc64(sqlite3_uint64 n){
#ifndef SQLITE_OMIT_AUTOINIT
if( sqlite3_initialize() ) return 0;
#endif
return sqlite3Malloc(n);
}
/*
** TRUE if p is a lookaside memory allocation from db
*/
#ifndef SQLITE_OMIT_LOOKASIDE
static int isLookaside(sqlite3 *db, const void *p){
return SQLITE_WITHIN(p, db->lookaside.pStart, db->lookaside.pTrueEnd);
}
#else
#define isLookaside(A,B) 0
#endif
/*
** Return the size of a memory allocation previously obtained from
** sqlite3Malloc() or sqlite3_malloc().
*/
int sqlite3MallocSize(const void *p){
assert( sqlite3MemdebugHasType(p, MEMTYPE_HEAP) );
return sqlite3GlobalConfig.m.xSize((void*)p);
}
static int lookasideMallocSize(sqlite3 *db, const void *p){
#ifndef SQLITE_OMIT_TWOSIZE_LOOKASIDE
return p<db->lookaside.pMiddle ? db->lookaside.szTrue : LOOKASIDE_SMALL;
#else
return db->lookaside.szTrue;
#endif
}
int sqlite3DbMallocSize(sqlite3 *db, const void *p){
assert( p!=0 );
#ifdef SQLITE_DEBUG
if( db==0 ){
assert( sqlite3MemdebugNoType(p, (u8)~MEMTYPE_HEAP) );
assert( sqlite3MemdebugHasType(p, MEMTYPE_HEAP) );
}else if( !isLookaside(db,p) ){
assert( sqlite3MemdebugHasType(p, (MEMTYPE_LOOKASIDE|MEMTYPE_HEAP)) );
assert( sqlite3MemdebugNoType(p, (u8)~(MEMTYPE_LOOKASIDE|MEMTYPE_HEAP)) );
}
#endif
i
B93C
f( db ){
if( ((uptr)p)<(uptr)(db->lookaside.pTrueEnd) ){
#ifndef SQLITE_OMIT_TWOSIZE_LOOKASIDE
if( ((uptr)p)>=(uptr)(db->lookaside.pMiddle) ){
assert( sqlite3_mutex_held(db->mutex) );
return LOOKASIDE_SMALL;
}
#endif
if( ((uptr)p)>=(uptr)(db->lookaside.pStart) ){
assert( sqlite3_mutex_held(db->mutex) );
return db->lookaside.szTrue;
}
}
}
return sqlite3GlobalConfig.m.xSize((void*)p);
}
sqlite3_uint64 sqlite3_msize(void *p){
assert( sqlite3MemdebugNoType(p, (u8)~MEMTYPE_HEAP) );
assert( sqlite3MemdebugHasType(p, MEMTYPE_HEAP) );
return p ? sqlite3GlobalConfig.m.xSize(p) : 0;
}
/*
** Free memory previously obtained from sqlite3Malloc().
*/
void sqlite3_free(void *p){
if( p==0 ) return; /* IMP: R-49053-54554 */
assert( sqlite3MemdebugHasType(p, MEMTYPE_HEAP) );
assert( sqlite3MemdebugNoType(p, (u8)~MEMTYPE_HEAP) );
if( sqlite3GlobalConfig.bMemstat ){
sqlite3_mutex_enter(mem0.mutex);
sqlite3StatusDown(SQLITE_STATUS_MEMORY_USED, sqlite3MallocSize(p));
sqlite3StatusDown(SQLITE_STATUS_MALLOC_COUNT, 1);
sqlite3GlobalConfig.m.xFree(p);
sqlite3_mutex_leave(mem0.mutex);
}else{
sqlite3GlobalConfig.m.xFree(p);
}
}
/*
** Add the size of memory allocation "p" to the count in
** *db->pnBytesFreed.
*/
static SQLITE_NOINLINE void measureAllocationSize(sqlite3 *db, void *p){
*db->pnBytesFreed += sqlite3DbMallocSize(db,p);
}
/*
** Free memory that might be associated with a particular database
** connection. Calling sqlite3DbFree(D,X) for X==0 is a harmless no-op.
** The sqlite3DbFreeNN(D,X) version requires that X be non-NULL.
*/
void sqlite3DbFreeNN(sqlite3 *db, void *p){
assert( db==0 || sqlite3_mutex_held(db->mutex) );
assert( p!=0 );
if( db ){
if( ((uptr)p)<(uptr)(db->lookaside.pEnd) ){
#ifndef SQLITE_OMIT_TWOSIZE_LOOKASIDE
if( ((uptr)p)>=(uptr)(db->lookaside.pMiddle) ){
LookasideSlot *pBuf = (LookasideSlot*)p;
assert( db->pnBytesFreed==0 );
#ifdef SQLITE_DEBUG
memset(p, 0xaa, LOOKASIDE_SMALL); /* Trash freed content */
#endif
pBuf->pNext = db->lookaside.pSmallFree;
db->lookaside.pSmallFree = pBuf;
return;
}
#endif /* SQLITE_OMIT_TWOSIZE_LOOKASIDE */
if( ((uptr)p)>=(uptr)(db->lookaside.pStart) ){
LookasideSlot *pBuf = (LookasideSlot*)p;
assert( db->pnBytesFreed==0 );
#ifdef SQLITE_DEBUG
memset(p, 0xaa, db->lookaside.szTrue); /* Trash freed content */
#endif
pBuf->pNext = db->lookaside.pFree;
db->lookaside.pFree = pBuf;
return;
}
}
if( db->pnBytesFreed ){
measureAllocationSize(db, p);
return;
}
}
assert( sqlite3MemdebugHasType(p, (MEMTYPE_LOOKASIDE|MEMTYPE_HEAP)) );
assert( sqlite3MemdebugNoType(p, (u8)~(MEMTYPE_LOOKASIDE|MEMTYPE_HEAP)) );
assert( db!=0 || sqlite3MemdebugNoType(p, MEMTYPE_LOOKASIDE) );
sqlite3MemdebugSetType(p, MEMTYPE_HEAP);
sqlite3_free(p);
}
void sqlite3DbNNFreeNN(sqlite3 *db, void *p){
assert( db!=0 );
assert( sqlite3_mutex_held(db->mutex) );
assert( p!=0 );
if( ((uptr)p)<(uptr)(db->lookaside.pEnd) ){
#ifndef SQLITE_OMIT_TWOSIZE_LOOKASIDE
if( ((uptr)p)>=(uptr)(db->lookaside.pMiddle) ){
LookasideSlot *pBuf = (LookasideSlot*)p;
assert( db->pnBytesFreed==0 );
#ifdef SQLITE_DEBUG
memset(p, 0xaa, LOOKASIDE_SMALL); /* Trash freed content */
#endif
pBuf->pNext = db->lookaside.pSmallFree;
db->lookaside.pSmallFree = pBuf;
return;
}
#endif /* SQLITE_OMIT_TWOSIZE_LOOKASIDE */
if( ((uptr)p)>=(uptr)(db->lookaside.pStart) ){
LookasideSlot *pBuf = (LookasideSlot*)p;
assert( db->pnBytesFreed==0 );
#ifdef SQLITE_DEBUG
memset(p, 0xaa, db->lookaside.szTrue); /* Trash freed content */
#endif
pBuf->pNext = db->lookaside.pFree;
db->lookaside.pFree = pBuf;
return;
}
}
if( db->pnBytesFreed ){
measureAllocationSize(db, p);
return;
}
assert( sqlite3MemdebugHasType(p, (MEMTYPE_LOOKASIDE|MEMTYPE_HEAP)) );
assert( sqlite3MemdebugNoType(p, (u8)~(MEMTYPE_LOOKASIDE|MEMTYPE_HEAP)) );
sqlite3MemdebugSetType(p, MEMTYPE_HEAP);
sqlite3_free(p);
}
void sqlite3DbFree(sqlite3 *db, void *p){
assert( db==0 || sqlite3_mutex_held(db->mutex) );
if( p ) sqlite3DbFreeNN(db, p);
}
/*
** Change the size of an existing memory allocation
*/
void *sqlite3Realloc(void *pOld, u64 nBytes){
int nOld, nNew, nDiff;
void *pNew;
assert( sqlite3MemdebugHasType(pOld, MEMTYPE_HEAP) );
assert( sqlite3MemdebugNoType(pOld, (u8)~MEMTYPE_HEAP) );
if( pOld==0 ){
return sqlite3Malloc(nBytes); /* IMP: R-04300-56712 */
}
if( nBytes==0 ){
sqlite3_free(pOld); /* IMP: R-26507-47431 */
return 0;
}
if( nBytes>=0x7fffff00 ){
/* The 0x7ffff00 limit term is explained in comments on sqlite3Malloc() */
return 0;
}
nOld = sqlite3MallocSize(pOld);
/* IMPLEMENTATION-OF: R-46199-30249 SQLite guarantees that the second
** argument to xRealloc is always a value returned by a prior call to
** xRoundup. */
nNew = sqlite3GlobalConfig.m.xRoundup((int)nBytes);
if( nOld==nNew ){
pNew = pOld;
}else if( sqlite3GlobalConfig.bMemstat ){
sqlite3_int64 nUsed;
sqlite3_mutex_enter(mem0.mutex);
sqlite3StatusHighwater(SQLITE_STATUS_MALLOC_SIZE, (int)nBytes);
nDiff = nNew - nOld;
if( nDiff>0 && (nUsed = sqlite3StatusValue(SQLITE_STATUS_MEMORY_USED)) >=
mem0.alarmThreshold-nDiff ){
sqlite3MallocAlarm(nDiff);
if( mem0.hardLimit>0 && nUsed >= mem0.hardLimit - nDiff ){
sqlite3_mutex_leave(mem0.mutex);
test_oom_breakpoint(1);
return 0;
}
}
pNew = sqlite3GlobalConfig.m.xRealloc(pOld, nNew);
#ifdef SQLITE_ENABLE_MEMORY_MANAGEMENT
if( pNew==0 && mem0.alarmThreshold>0 ){
sqlite3MallocAlarm((int)nBytes);
pNew = sqlite3GlobalConfig.m.xRealloc(pOld, nNew);
}
#endif
if( pNew ){
nNew = sqlite3MallocSize(pNew);
sqlite3StatusUp(SQLITE_STATUS_MEMORY_USED, nNew-nOld);
}
sqlite3_mutex_leave(mem0.mutex);
}else{
pNew = sqlite3GlobalConfig.m.xRealloc(pOld, nNew);
}
assert( EIGHT_BYTE_ALIGNMENT(pNew) ); /* IMP: R-11148-40995 */
return pNew;
}
/*
** The public interface to sqlite3Realloc. Make sure that the memory
** subsystem is initialized prior to invoking sqliteRealloc.
*/
void *sqlite3_realloc(void *pOld, int n){
#ifndef SQLITE_OMIT_AUTOINIT
if( sqlite3_initialize() ) return 0;
#endif
if( n<0 ) n = 0; /* IMP: R-26507-47431 */
return sqlite3Realloc(pOld, n);
}
void *sqlite3_realloc64(void *pOld, sqlite3_uint64 n){
#ifndef SQLITE_OMIT_AUTOINIT
if( sqlite3_initialize() ) return 0;
#endif
return sqlite3Realloc(pOld, n);
}
/*
** Allocate and zero memory.
*/
void *sqlite3MallocZero(u64 n){
void *p = sqlite3Malloc(n);
if( p ){
memset(p, 0, (size_t)n);
}
return p;
}
/*
** Allocate and zero memory. If the allocation fails, make
** the mallocFailed flag in the connection pointer.
*/
void *sqlite3DbMallocZero(sqlite3 *db, u64 n){
void *p;
testcase( db==0 );
p = sqlite3DbMallocRaw(db, n);
if( p ) memset(p, 0, (size_t)n);
return p;
}
/* Finish the work of sqlite3DbMallocRawNN for the unusual and
** slower case when the allocation cannot be fulfilled using lookaside.
*/
static SQLITE_NOINLINE void *dbMallocRawFinish(sqlite3 *db, u64 n){
void *p;
assert( db!=0 );
p = sqlite3Malloc(n);
if( !p ) sqlite3OomFault(db);
sqlite3MemdebugSetType(p,
(db->lookaside.bDisable==0) ? MEMTYPE_LOOKASIDE : MEMTYPE_HEAP);
return p;
}
/*
** Allocate memory, either lookaside (if possible) or heap.
** If the allocation fails, set the mallocFailed flag in
** the connection pointer.
**
** If db!=0 and db->mallocFailed is true (indicating a prior malloc
** failure on the same database connection) then always return 0.
** Hence for a particular database connection, once malloc starts
** failing, it fails consistently until mallocFailed is reset.
** This is an important assumption. There are many places in the
** code that do things like this:
**
** int *a = (int*)sqlite3DbMallocRaw(db, 100);
** int *b = (int*)sqlite3DbMallocRaw(db, 200);
** if( b ) a[10] = 9;
**
** In other words, if a subsequent malloc (ex: "b") worked, it is assumed
** that all prior mallocs (ex: "a") worked too.
**
** The sqlite3MallocRawNN() variant guarantees that the "db" parameter is
** not a NULL pointer.
*/
void *sqlite3DbMallocRaw(sqlite3 *db, u64 n){
void *p;
if( db ) return sqlite3DbMallocRawNN(db, n);
p = sqlite3Malloc(n);
sqlite3MemdebugSetType(p, MEMTYPE_HEAP);
return p;
}
void *sqlite3DbMallocRawNN(sqlite3 *db, u64 n){
#ifndef SQLITE_OMIT_LOOKASIDE
LookasideSlot *pBuf;
assert( db!=0 );
assert( sqlite3_mutex_held(db->mutex) );
assert( db->pnBytesFreed==0 );
if( n>db->lookaside.sz ){
if( !db->lookaside.bDisable ){
db->lookaside.anStat[1]++;
}else if( db->mallocFailed ){
return 0;
}
return dbMallocRawFinish(db, n);
}
#ifndef SQLITE_OMIT_TWOSIZE_LOOKASIDE
if( n<=LOOKASIDE_SMALL ){
if( (pBuf = db->lookaside.pSmallFree)!=0 ){
db->lookaside.pSmallFree = pBuf->pNext;
db->lookaside.anStat[0]++;
return (void*)pBuf;
}else if( (pBuf = db->lookaside.pSmallInit)!=0 ){
db->lookaside.pSmallInit = pBuf->pNext;
db->lookaside.anStat[0]++;
return (void*)pBuf;
}
}
#endif
if( (pBuf = db->lookaside.pFree)!=0 ){
db->lookaside.pFree = pBuf->pNext;
db->lookaside.anStat[0]++;
return (void*)pBuf;
}else if( (pBuf = db->lookaside.pInit)!=0 ){
db->lookaside.pInit = pBuf->pNext;
db->lookaside.anStat[0]++;
return (void*)pBuf;
}else{
db->lookaside.anStat[2]++;
}
#else
assert( db!=0 );
assert( sqlite3_mutex_held(db->mutex) );
assert( db->pnBytesFreed==0 );
if( db->mallocFailed ){
return 0;
}
#endif
return dbMallocRawFinish(db, n);
}
/* Forward declaration */
static SQLITE_NOINLINE void *dbReallocFinish(sqlite3 *db, void *p, u64 n);
/*
** Resize the block of memory pointed to by p to n bytes. If the
** resize fails, set the mallocFailed flag in the connection object.
*/
void *sqlite3DbRealloc(sqlite3 *db, void *p, u64 n){
assert( db!=0 );
if( p==0 ) return sqlite3DbMallocRawNN(db, n);
assert( sqlite3_mutex_held(db->mutex) );
if( ((uptr)p)<(uptr)db->lookaside.pEnd ){
#ifndef SQLITE_OMIT_TWOSIZE_LOOKASIDE
if( ((uptr)p)>=(uptr)db->lookaside.pMiddle ){
if( n<=LOOKASIDE_SMALL ) return p;
}else
#endif
if( ((uptr)p)>=(uptr)db->lookaside.pStart ){
if( n<=db->lookaside.szTrue ) return p;
}
}
return dbReallocFinish(db, p, n);
}
static SQLITE_NOINLINE void *dbReallocFinish(sqlite3 *db, void *p, u64 n){
void *pNew = 0;
assert( db!=0 );
assert( p!=0 );
if( db->mallocFailed==0 ){
if( isLookaside(db, p) ){
pNew = sqlite3DbMallocRawNN(db, n);
if( pNew ){
memcpy(pNew, p, lookasideMallocSize(db, p));
sqlite3DbFree(db, p);
}
}else{
assert( sqlite3MemdebugHasType(p, (MEMTYPE_LOOKASIDE|MEMTYPE_HEAP)) );
assert( sqlite3MemdebugNoType(p, (u8)~(MEMTYPE_LOOKASIDE|MEMTYPE_HEAP)) );
sqlite3MemdebugSetType(p, MEMTYPE_HEAP);
pNew = sqlite3Realloc(p, n);
if( !pNew ){
sqlite3OomFault(db);
}
sqlite3MemdebugSetType(pNew,
(db->lookaside.bDisable==0 ? MEMTYPE_LOOKASIDE : MEMTYPE_HEAP));
}
}
return pNew;
}
/*
** Attempt to reallocate p. If the reallocation fails, then free p
** and set the mallocFailed flag in the database connection.
*/
void *sqlite3DbReallocOrFree(sqlite3 *db, void *p, u64 n){
void *pNew;
pNew = sqlite3DbRealloc(db, p, n);
if( !pNew ){
sqlite3DbFree(db, p);
}
return pNew;
}
/*
** Make a copy of a string in memory obtained from sqliteMalloc(). These
** functions call sqlite3MallocRaw() directly instead of sqliteMalloc(). This
** is because when memory debugging is turned on, these two functions are
** called via macros that record the current file and line number in the
** ThreadData structure.
*/
char *sqlite3DbStrDup(sqlite3 *db, const char *z){
char *zNew;
size_t n;
if( z==0 ){
return 0;
}
n = strlen(z) + 1;
zNew = sqlite3DbMallocRaw(db, n);
if( zNew ){
memcpy(zNew, z, n);
}
return zNew;
}
char *sqlite3DbStrNDup(sqlite3 *db, const char *z, u64 n){
char *zNew;
assert( db!=0 );
assert( z!=0 || n==0 );
assert( (n&0x7fffffff)==n );
zNew = z ? sqlite3DbMallocRawNN(db, n+1) : 0;
if( zNew ){
memcpy(zNew, z, (size_t)n);
zNew[n] = 0;
}
return zNew;
}
/*
** The text between zStart and zEnd represents a phrase within a larger
** SQL statement. Make a copy of this phrase in space obtained form
** sqlite3DbMalloc(). Omit leading and trailing whitespace.
*/
char *sqlite3DbSpanDup(sqlite3 *db, const char *zStart, const char *zEnd){
int n;
#ifdef SQLITE_DEBUG
/* Because of the way the parser works, the span is guaranteed to contain
** at least one non-space character */
for(n=0; sqlite3Isspace(zStart[n]); n++){ assert( &zStart[n]<zEnd ); }
#endif
while( sqlite3Isspace(zStart[0]) ) zStart++;
n = (int)(zEnd - zStart);
while( sqlite3Isspace(zStart[n-1]) ) n--;
return sqlite3DbStrNDup(db, zStart, n);
}
/*
** Free any prior content in *pz and replace it with a copy of zNew.
*/
void sqlite3SetString(char **pz, sqlite3 *db, const char *zNew){
char *z = sqlite3DbStrDup(db, zNew);
sqlite3DbFree(db, *pz);
*pz = z;
}
/*
** Call this routine to record the fact that an OOM (out-of-memory) error
** has happened. This routine will set db->mallocFailed, and also
** temporarily disable the lookaside memory allocator and interrupt
** any running VDBEs.
**
** Always return a NULL pointer so that this routine can be invoked using
**
** return sqlite3OomFault(db);
**
** and thereby avoid unnecessary stack frame allocations for the overwhelmingly
** common case where no OOM occurs.
*/
void *sqlite3OomFault(sqlite3 *db){
if( db->mallocFailed==0 && db->bBenignMalloc==0 ){
db->mallocFailed = 1;
if( db->nVdbeExec>0 ){
AtomicStore(&db->u1.isInterrupted, 1);
}
DisableLookaside;
if( db->pParse ){
Parse *pParse;
sqlite3ErrorMsg(db->pParse, "out of memory");
db->pParse->rc = SQLITE_NOMEM_BKPT;
for(pParse=db->pParse->pOuterParse; pParse; pParse = pParse->pOuterParse){
pParse->nErr++;
pParse->rc = SQLITE_NOMEM;
}
}
}
return 0;
}
/*
** This routine reactivates the memory allocator and clears the
** db->mallocFailed flag as necessary.
**
** The memory allocator is not restarted if there are running
** VDBEs.
*/
void sqlite3OomClear(sqlite3 *db){
if( db->mallocFailed && db->nVdbeExec==0 ){
db->mallocFailed = 0;
AtomicStore(&db->u1.isInterrupted, 0);
assert( db->lookaside.bDisable>0 );
EnableLookaside;
}
}
/*
** Take actions at the end of an API call to deal with error codes.
*/
static SQLITE_NOINLINE int apiHandleError(sqlite3 *db, int rc){
if( db->mallocFailed || rc==SQLITE_IOERR_NOMEM ){
sqlite3OomClear(db);
sqlite3Error(db, SQLITE_NOMEM);
return SQLITE_NOMEM_BKPT;
}
return rc & db->errMask;
}
/*
** This function must be called before exiting any API function (i.e.
** returning control to the user) that has called sqlite3_malloc or
** sqlite3_realloc.
**
** The returned value is normally a copy of the second argument to this
** function. However, if a malloc() failure has occurred since the previous
** invocation SQLITE_NOMEM is returned instead.
**
** If an OOM as occurred, then the connection error-code (the value
** returned by sqlite3_errcode()) is set to SQLITE_NOMEM.
*/
int sqlite3ApiExit(sqlite3* db, int rc){
/* If the db handle must hold the connection handle mutex here.
** Otherwise the read (and possible write) of db->mallocFailed
** is unsafe, as is the call to sqlite3Error().
*/
assert( db!=0 );
assert( sqlite3_mutex_held(db->mutex) );
if( db->mallocFailed || rc ){
return apiHandleError(db, rc);
}
return 0;
}