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Registers (aka memory cells) in the VM are now numbered starting with 1

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instead of 0.  A register number of 0 means "no such register". (CVS 4669)

FossilOrigin-Name: 0b849805c3a0f562d50623f406279b400d335639
This commit is contained in:
drh
2008-01-03 18:03:08 +00:00
parent 2a339ff677
commit 0a07c107a6
14 changed files with 110 additions and 111 deletions
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18
src/select.c
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@@ -12,7 +12,7 @@
** This file contains C code routines that are called by the parser
** to handle SELECT statements in SQLite.
**
** $Id: select.c,v 1.380 2008/01/03 09:51:55 danielk1977 Exp $
** $Id: select.c,v 1.381 2008/01/03 18:03:09 drh Exp $
*/
#include "sqliteInt.h"
@@ -541,7 +541,7 @@ static int selectInnerLoop(
}else{
n = pEList->nExpr;
}
iMem = pParse->nMem;
iMem = ++pParse->nMem;
pParse->nMem += n+1;
sqlite3VdbeAddOp2(v, OP_MemInt, n, iMem);
if( nColumn>0 ){
@@ -1746,8 +1746,8 @@ static void computeLimitRegisters(Parse *pParse, Select *p, int iBreak){
** no rows.
*/
if( p->pLimit ){
p->iLimit = iLimit = pParse->nMem;
pParse->nMem += 2;
p->iLimit = iLimit = ++pParse->nMem;
pParse->nMem++;
v = sqlite3GetVdbe(pParse);
if( v==0 ) return;
sqlite3ExprCode(pParse, p->pLimit);
@@ -1758,7 +1758,7 @@ static void computeLimitRegisters(Parse *pParse, Select *p, int iBreak){
sqlite3VdbeAddOp2(v, OP_MemLoad, iLimit, 0);
}
if( p->pOffset ){
p->iOffset = iOffset = pParse->nMem++;
p->iOffset = iOffset = ++pParse->nMem;
v = sqlite3GetVdbe(pParse);
if( v==0 ) return;
sqlite3ExprCode(pParse, p->pOffset);
@@ -3449,11 +3449,11 @@ int sqlite3Select(
/* Initialize memory locations used by GROUP BY aggregate processing
*/
iUseFlag = pParse->nMem++;
iAbortFlag = pParse->nMem++;
iAMem = pParse->nMem;
iUseFlag = ++pParse->nMem;
iAbortFlag = ++pParse->nMem;
iAMem = pParse->nMem + 1;
pParse->nMem += pGroupBy->nExpr;
iBMem = pParse->nMem;
iBMem = pParse->nMem + 1;
pParse->nMem += pGroupBy->nExpr;
sqlite3VdbeAddOp2(v, OP_MemInt, 0, iAbortFlag);
VdbeComment((v, "clear abort flag"));