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Some modifications to insert.c to work without using the stack. (CVS 4678)

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FossilOrigin-Name: d9ac6beef538376d0ea0a1daa95cf1dfe36143cf
This commit is contained in:
danielk1977
2008-01-04 19:10:28 +00:00
parent 3a40f696d4
commit 287fb61c6b
10 changed files with 114 additions and 81 deletions
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26
src/update.c
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@@ -12,7 +12,7 @@
** This file contains C code routines that are called by the parser
** to handle UPDATE statements.
**
** $Id: update.c,v 1.156 2008/01/04 13:57:26 danielk1977 Exp $
** $Id: update.c,v 1.157 2008/01/04 19:10:29 danielk1977 Exp $
*/
#include "sqliteInt.h"
@@ -592,7 +592,9 @@ static void updateVirtualTable(
int ephemTab; /* Table holding the result of the SELECT */
int i; /* Loop counter */
int addr; /* Address of top of loop */
int iReg; /* First register in set passed to OP_VUpdate */
sqlite3 *db = pParse->db; /* Database connection */
const char *pVtab = (const char*)pTab->pVtab;
SelectDest dest = {SRT_Table, 0, 0};
/* Construct the SELECT statement that will find the new values for
@@ -627,26 +629,18 @@ static void updateVirtualTable(
dest.iParm = ephemTab;
sqlite3Select(pParse, pSelect, &dest, 0, 0, 0, 0);
/*
** Generate code to scan the ephemeral table and call VDelete and
** VInsert
*/
/* Generate code to scan the ephemeral table and call VUpdate. */
iReg = ++pParse->nMem;
pParse->nMem += pTab->nCol+1;
sqlite3VdbeAddOp2(v, OP_Rewind, ephemTab, 0);
addr = sqlite3VdbeCurrentAddr(v);
sqlite3VdbeAddOp2(v, OP_Column, ephemTab, 0);
if( pRowid ){
sqlite3VdbeAddOp2(v, OP_Column, ephemTab, 1);
}else{
sqlite3VdbeAddOp2(v, OP_Dup, 0, 0);
}
sqlite3VdbeAddOp3(v, OP_Column, ephemTab, 0, iReg);
sqlite3VdbeAddOp3(v, OP_Column, ephemTab, (pRowid?1:0), iReg+1);
for(i=0; i<pTab->nCol; i++){
sqlite3VdbeAddOp2(v, OP_Column, ephemTab, i+1+(pRowid!=0));
sqlite3VdbeAddOp3(v, OP_Column, ephemTab, i+1+(pRowid!=0), iReg+2+i);
}
pParse->pVirtualLock = pTab;
sqlite3VdbeAddOp4(v, OP_VUpdate, 0, pTab->nCol+2,
sqlite3StackToReg(pParse, pTab->nCol+2),
(const char*)pTab->pVtab, P4_VTAB
);
sqlite3VdbeAddOp4(v, OP_VUpdate, 0, pTab->nCol+2, iReg, pVtab, P4_VTAB);
sqlite3VdbeAddOp2(v, OP_Next, ephemTab, addr);
sqlite3VdbeJumpHere(v, addr-1);
sqlite3VdbeAddOp2(v, OP_Close, ephemTab, 0);