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Negative N values in sqlite3_get_auxdata() and sqlite3_set_auxdata() can be

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used to access an auxiliary data cache over all functions in a single prepared 
statement.

FossilOrigin-Name: ff5306752e83e760255a10f20168c0f090929a4fee2a5f720dfab36f0ee72fae
This commit is contained in:
drh
2017-05-11 15:20:18 +00:00
parent 9418921c59
commit f7fa4e71f4
5 changed files with 39 additions and 17 deletions
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19
src/vdbeapi.c
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@@ -804,6 +804,12 @@ void *sqlite3_aggregate_context(sqlite3_context *p, int nByte){
/*
** Return the auxiliary data pointer, if any, for the iArg'th argument to
** the user-function defined by pCtx.
**
** The left-most argument is 0.
**
** Undocumented behavior: If iArg is negative then access a cache of
** auxiliary data pointers that is available to all functions within a
** single prepared statement. The iArg values must match.
*/
void *sqlite3_get_auxdata(sqlite3_context *pCtx, int iArg){
AuxData *pAuxData;
@@ -815,7 +821,7 @@ void *sqlite3_get_auxdata(sqlite3_context *pCtx, int iArg){
assert( pCtx->pVdbe!=0 );
#endif
for(pAuxData=pCtx->pVdbe->pAuxData; pAuxData; pAuxData=pAuxData->pNextAux){
if( pAuxData->iAuxOp==pCtx->iOp && pAuxData->iAuxArg==iArg ){
if( pAuxData->iAuxArg==iArg && (pAuxData->iAuxOp==pCtx->iOp || iArg<0) ){
return pAuxData->pAux;
}
}
@@ -826,6 +832,12 @@ void *sqlite3_get_auxdata(sqlite3_context *pCtx, int iArg){
** Set the auxiliary data pointer and delete function, for the iArg'th
** argument to the user-function defined by pCtx. Any previous value is
** deleted by calling the delete function specified when it was set.
**
** The left-most argument is 0.
**
** Undocumented behavior: If iArg is negative then make the data available
** to all functions within the current prepared statement using iArg as an
** access code.
*/
void sqlite3_set_auxdata(
sqlite3_context *pCtx,
@@ -837,7 +849,6 @@ void sqlite3_set_auxdata(
Vdbe *pVdbe = pCtx->pVdbe;
assert( sqlite3_mutex_held(pCtx->pOut->db->mutex) );
if( iArg<0 ) goto failed;
#ifdef SQLITE_ENABLE_STAT3_OR_STAT4
if( pVdbe==0 ) goto failed;
#else
@@ -845,7 +856,9 @@ void sqlite3_set_auxdata(
#endif
for(pAuxData=pVdbe->pAuxData; pAuxData; pAuxData=pAuxData->pNextAux){
if( pAuxData->iAuxOp==pCtx->iOp && pAuxData->iAuxArg==iArg ) break;
if( pAuxData->iAuxArg==iArg && (pAuxData->iAuxOp==pCtx->iOp || iArg<0) ){
break;
}
}
if( pAuxData==0 ){
pAuxData = sqlite3DbMallocZero(pVdbe->db, sizeof(AuxData));