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Use a vdbe memory cell to allocate the space required for vdbe cursors. (CVS 4912)

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FossilOrigin-Name: 047153648155654b0cd70b811935209d2e21776c
This commit is contained in:
danielk1977
2008-03-25 09:47:35 +00:00
parent 1e968a0cbf
commit cd3e8f7ce9
18 changed files with 251 additions and 177 deletions
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27
src/vdbeblob.c
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@@ -12,7 +12,7 @@
**
** This file contains code used to implement incremental BLOB I/O.
**
** $Id: vdbeblob.c,v 1.20 2008/01/25 15:04:50 drh Exp $
** $Id: vdbeblob.c,v 1.21 2008/03/25 09:47:35 danielk1977 Exp $
*/
#include "sqliteInt.h"
@@ -70,16 +70,17 @@ int sqlite3_blob_open(
/* One of the following two instructions is replaced by an
** OP_Noop before exection.
*/
{OP_OpenRead, 0, 0, 0}, /* 2: Open cursor 0 for reading */
{OP_OpenWrite, 0, 0, 0}, /* 3: Open cursor 0 for read/write */
{OP_SetNumColumns, 0, 0, 0}, /* 2: Num cols for cursor */
{OP_OpenRead, 0, 0, 0}, /* 3: Open cursor 0 for reading */
{OP_SetNumColumns, 0, 0, 0}, /* 4: Num cols for cursor */
{OP_OpenWrite, 0, 0, 0}, /* 5: Open cursor 0 for read/write */
{OP_Variable, 1, 1, 0}, /* 5: Push the rowid to the stack */
{OP_NotExists, 0, 10, 1}, /* 6: Seek the cursor */
{OP_Column, 0, 0, 1}, /* 7 */
{OP_ResultRow, 1, 0, 0}, /* 8 */
{OP_Close, 0, 0, 0}, /* 9 */
{OP_Halt, 0, 0, 0}, /* 10 */
{OP_Variable, 1, 1, 0}, /* 6: Push the rowid to the stack */
{OP_NotExists, 0, 10, 1}, /* 7: Seek the cursor */
{OP_Column, 0, 0, 1}, /* 8 */
{OP_ResultRow, 1, 0, 0}, /* 9 */
{OP_Close, 0, 0, 0}, /* 10 */
{OP_Halt, 0, 0, 0}, /* 11 */
};
Vdbe *v = 0;
@@ -168,9 +169,9 @@ int sqlite3_blob_open(
/* Remove either the OP_OpenWrite or OpenRead. Set the P2
** parameter of the other to pTab->tnum.
*/
sqlite3VdbeChangeToNoop(v, (flags ? 2 : 3), 1);
sqlite3VdbeChangeP2(v, (flags ? 3 : 2), pTab->tnum);
sqlite3VdbeChangeP3(v, (flags ? 3 : 2), iDb);
sqlite3VdbeChangeToNoop(v, (flags ? 3 : 5), 1);
sqlite3VdbeChangeP2(v, (flags ? 5 : 3), pTab->tnum);
sqlite3VdbeChangeP3(v, (flags ? 5 : 3), iDb);
/* Configure the OP_SetNumColumns. Configure the cursor to
** think that the table has one more column than it really
@@ -179,7 +180,7 @@ int sqlite3_blob_open(
** we can invoke OP_Column to fill in the vdbe cursors type
** and offset cache without causing any IO.
*/
sqlite3VdbeChangeP2(v, 4, pTab->nCol+1);
sqlite3VdbeChangeP2(v, flags ? 4 : 2, pTab->nCol+1);
if( !db->mallocFailed ){
sqlite3VdbeMakeReady(v, 1, 1, 1, 0);
}