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Modify FifoRead and FifoWrite to work exclusively with memory cells. (CVS 4676)

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FossilOrigin-Name: 2c913908a47e7ace7d964067e3566d232ee2d494
This commit is contained in:
danielk1977
2008-01-04 13:57:26 +00:00
parent 96cb76fc7a
commit dd2fb29be8
5 changed files with 37 additions and 44 deletions
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22
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 1.155 2008/01/03 23:44:53 drh Exp $
** $Id: update.c,v 1.156 2008/01/04 13:57:26 danielk1977 Exp $
*/
#include "sqliteInt.h"
@@ -106,6 +106,7 @@ void sqlite3Update(
int iDb; /* Database containing the table being updated */
int memCnt = 0; /* Memory cell used for counting rows changed */
int mem1; /* Memory address storing the rowid for next row to update */
int iRowid; /* Memory address storing rowids */
#ifndef SQLITE_OMIT_TRIGGER
int isView; /* Trying to update a view */
@@ -343,8 +344,9 @@ void sqlite3Update(
/* Remember the rowid of every item to be updated.
*/
sqlite3VdbeAddOp2(v, IsVirtual(pTab) ? OP_VRowid : OP_Rowid, iCur, 0);
sqlite3VdbeAddOp2(v, OP_FifoWrite, 0, 0);
iRowid = ++pParse->nMem;
sqlite3VdbeAddOp2(v, IsVirtual(pTab) ? OP_VRowid : OP_Rowid, iCur, iRowid);
sqlite3VdbeAddOp2(v, OP_FifoWrite, iRowid, 0);
/* End the database scan loop.
*/
@@ -384,7 +386,6 @@ void sqlite3Update(
assert( pParse->nTab>iCur+i+1 );
}
}
}
/* Jump back to this point if a trigger encounters an IGNORE constraint. */
@@ -393,14 +394,13 @@ void sqlite3Update(
}
/* Top of the update loop */
addr = sqlite3VdbeAddOp2(v, OP_FifoRead, 0, 0);
addr = sqlite3VdbeAddOp2(v, OP_FifoRead, iRowid, 0);
sqlite3VdbeAddOp2(v, OP_StackDepth, -1, 0);
sqlite3VdbeAddOp2(v, OP_MemStore, mem1, 0);
if( triggers_exist ){
/* Make cursor iCur point to the record that is being updated.
*/
sqlite3VdbeAddOp2(v, OP_NotExists, iCur, addr);
sqlite3VdbeAddOp3(v, OP_NotExists, iCur, addr, iRowid);
/* Generate the OLD table
*/
@@ -445,10 +445,6 @@ void sqlite3Update(
sqlite3VdbeAddOp2(v, OP_Goto, 0, iBeginBeforeTrigger);
sqlite3VdbeJumpHere(v, iEndBeforeTrigger);
if( !isView ){
sqlite3VdbeAddOp2(v, OP_MemLoad, mem1, 0);
}
}
if( !isView && !IsVirtual(pTab) ){
@@ -459,8 +455,8 @@ void sqlite3Update(
** Also, the old data is needed to delete the old index entries.
** So make the cursor point at the old record.
*/
sqlite3VdbeAddOp2(v, OP_NotExists, iCur, addr);
sqlite3VdbeAddOp2(v, OP_MemLoad, mem1, 0);
sqlite3VdbeAddOp3(v, OP_NotExists, iCur, addr, iRowid);
sqlite3VdbeAddOp2(v, OP_MemLoad, iRowid, 0);
/* If the record number will change, push the record number as it
** will be after the update. (The old record number is currently