/*
** This is the test layer's wrapper around sqlite3OsFree(). The argument is a
** pointer to the space allocated for the application to use.
*/
static void OSFREE(void *pFree){
u32 *p = (u32 *)getOsPointer(pFree); /* p points to Os level allocation */
checkGuards(p);
unlinkAlloc(p);
memset(pFree, 0x55, OSSIZEOF(pFree));
sqlite3OsFree(p);
sqlite3_nFree++;
}
/*
** This is the test layer's wrapper around sqlite3OsFree(). The argument is a
** pointer to the space allocated for the application to use.
*/
static void OSFREE(void *pFree){
u32 *p; /* Pointer to the OS-layer allocation */
sqlite3OsEnterMutex();
p = (u32 *)getOsPointer(pFree);
checkGuards(p);
unlinkAlloc(p);
memset(pFree, 0x55, OSSIZEOF(pFree));
sqlite3OsFree(p);
sqlite3_nFree++;
sqlite3OsLeaveMutex();
}
/*
** This is the test layer's wrapper around sqlite3OsRealloc().
*/
static void * OSREALLOC(void *pRealloc, int n){
#ifdef SQLITE_ENABLE_MEMORY_MANAGEMENT
sqlite3_nMaxAlloc =
MAX(sqlite3_nMaxAlloc, sqlite3ThreadDataReadOnly()->nAlloc);
#endif
assert( !sqlite3_mallocDisallowed );
if( !sqlite3TestMallocFail() ){
u32 *p = (u32 *)getOsPointer(pRealloc);
checkGuards(p);
p = sqlite3OsRealloc(p, n + TESTALLOC_OVERHEAD);
applyGuards(p);
relinkAlloc(p);
return (void *)(&p[TESTALLOC_NGUARD + 2*sizeof(void *)/sizeof(u32)]);
}
return 0;
}
/*
** The argument is a pointer returned by sqlite3OsMalloc() or Realloc(). The
** first and last (TESTALLOC_NGUARD*4) bytes are set to known values for use as
** guard-posts.
*/
static void applyGuards(u32 *p)
{
int i;
char *z;
char *zAlloc = (char *)p;
/* First set of guard words */
z = &zAlloc[TESTALLOC_OFFSET_GUARD1(p)];
for(i=0; i<TESTALLOC_NGUARD; i++){
((u32 *)z)[i] = 0xdead1122;
}
/* Second set of guard words */
z = &zAlloc[TESTALLOC_OFFSET_GUARD2(p)];
for(i=0; i<TESTALLOC_NGUARD; i++){
static const int guard = 0xdead3344;
memcpy(&z[i*sizeof(u32)], &guard, sizeof(u32));
}
/* Line number */
z = &((char *)z)[TESTALLOC_NGUARD*sizeof(u32)]; /* Guard words */
z = &zAlloc[TESTALLOC_OFFSET_LINENUMBER(p)];
memcpy(z, &sqlite3_iLine, sizeof(u32));
/* File name */
z = &zAlloc[TESTALLOC_OFFSET_FILENAME(p)];
strncpy(z, sqlite3_zFile, TESTALLOC_FILESIZE);
z[TESTALLOC_FILESIZE - 1] = '\0';
/* User string */
z = &zAlloc[TESTALLOC_OFFSET_USER(p)];
z[0] = 0;
if( sqlite3_malloc_id ){
strncpy(z, sqlite3_malloc_id, TESTALLOC_USERSIZE);
z[TESTALLOC_USERSIZE-1] = 0;
}
/* backtrace() stack */
z = &zAlloc[TESTALLOC_OFFSET_STACK(p)];
backtrace((void **)z, TESTALLOC_STACKFRAMES);
/* Sanity check to make sure checkGuards() is working */
checkGuards(p);
}
