SQLite

      sqlite3VdbeAddOp3(v, OP_NotExists, iCur, addr, iRowid);

      /* Populate the OLD.* pseudo-table */
      assert( regOld==iRowid+1 );
      for(i=0; i<pTab->nCol; i++){
        if( mask==0xffffffff || mask&(1<<i) ){
          sqlite3VdbeAddOp3(v, OP_Column, iCur, i, regOld+i);
          sqlite3ColumnDefault(v, pTab, i, regOld+i);
        }
      }
      sqlite3VdbeAddOp2(v, OP_Affinity, regOld, pTab->nCol);
      sqlite3TableAffinityStr(v, pTab);

      sqlite3CodeRowTrigger(pParse, pTrigger, 
          TK_DELETE, 0, TRIGGER_BEFORE, pTab, -1, iRowid, OE_Default, addr
      );
    }

    if( !isView ){
      /* Delete the row */
#ifndef SQLITE_OMIT_VIRTUALTABLE
      if( IsVirtual(pTab) ){
        const char *pVTab = (const char *)sqlite3GetVTable(db, pTab);
        sqlite3VtabMakeWritable(pParse, pTab);
        sqlite3VdbeAddOp4(v, OP_VUpdate, 0, 1, iRowid, pVTab, P4_VTAB);
      }else
#endif
      {
        sqlite3GenerateRowDelete(pParse, pTab, iCur, iRowid, pParse->nested==0);
      }
    }

    /* Code the AFTER triggers. This is a no-op if there are no triggers. */
    sqlite3CodeRowTrigger(pParse, 
      pTrigger, TK_DELETE, 0, TRIGGER_AFTER, pTab, -1, iRowid, OE_Default, addr
    );

    /* End of the delete loop */
    sqlite3VdbeAddOp2(v, OP_Goto, 0, addr);
    sqlite3VdbeResolveLabel(v, end);

    /* Close the cursors open on the table and its indexes. */

  CollSeq *pColl = 0;
  Expr *p = pExpr;
  while( ALWAYS(p) ){
    int op;
    pColl = p->pColl;
    if( pColl ) break;
    op = p->op;
    if( p->pTab!=0 && (
        op==TK_AGG_COLUMN || op==TK_COLUMN || op==TK_REGISTER || op==TK_TRIGGER
    )){
      /* op==TK_REGISTER && p->pTab!=0 happens when pExpr was originally
      ** a TK_COLUMN but was previously evaluated and cached in a register */
      const char *zColl;
      int j = p->iColumn;
      if( j>=0 ){
        sqlite3 *db = pParse->db;
        zColl = p->pTab->aCol[j].zColl;

    }
    case TK_UPLUS: {
      inReg = sqlite3ExprCodeTarget(pParse, pExpr->pLeft, target);
      break;
    }

    case TK_TRIGGER: {
      int iVal = pExpr->iTable * (pExpr->pTab->nCol+1) + 1 + pExpr->iColumn;
      sqlite3VdbeAddOp2(v, OP_Param, iVal, target);

      VdbeComment((v, "%s.%s -> $%d", 
        (pExpr->iTable ? "new" : "old"), 
        (pExpr->iColumn<0 ? "rowid" : pExpr->pTab->aCol[pExpr->iColumn].zName),
	target
      ));
      break;
    }


    /*
    ** Form A:

static int autoIncBegin(
  Parse *pParse,      /* Parsing context */
  int iDb,            /* Index of the database holding pTab */
  Table *pTab         /* The table we are writing to */
){
  int memId = 0;      /* Register holding maximum rowid */
  if( pTab->tabFlags & TF_Autoincrement ){
    Parse *pRoot = (pParse->pRoot ? pParse->pRoot : pParse);
    AutoincInfo *pInfo;

    pInfo = pRoot->pAinc;
    while( pInfo && pInfo->pTab!=pTab ){ pInfo = pInfo->pNext; }
    if( pInfo==0 ){
      pInfo = sqlite3DbMallocRaw(pParse->db, sizeof(*pInfo));
      if( pInfo==0 ) return 0;
      pInfo->pNext = pRoot->pAinc;
      pRoot->pAinc = pInfo;
      pInfo->pTab = pTab;
      pInfo->iDb = iDb;
      pRoot->nMem++;                  /* Register to hold name of table */
      pInfo->regCtr = ++pRoot->nMem;  /* Max rowid register */
      pRoot->nMem++;                  /* Rowid in sqlite_sequence */
    }
    memId = pInfo->regCtr;
  }
  return memId;
}

/*
** This routine generates code that will initialize all of the
** register used by the autoincrement tracker.  
*/
void sqlite3AutoincrementBegin(Parse *pParse){
  AutoincInfo *p;            /* Information about an AUTOINCREMENT */
  sqlite3 *db = pParse->db;  /* The database connection */
  Db *pDb;                   /* Database only autoinc table */
  int memId;                 /* Register holding max rowid */
  int addr;                  /* A VDBE address */
  Vdbe *v = pParse->pVdbe;   /* VDBE under construction */

  /* If currently generating a trigger program, this call is a no-op */
  if( pParse->pTriggerTab ) return;

  assert( v );   /* We failed long ago if this is not so */
  for(p = pParse->pAinc; p; p = p->pNext){
    pDb = &db->aDb[p->iDb];
    memId = p->regCtr;
    sqlite3OpenTable(pParse, 0, p->iDb, pDb->pSchema->pSeqTab, OP_OpenRead);
    addr = sqlite3VdbeCurrentAddr(v);

  }
  regData = regRowid+1;

  /* Run the BEFORE and INSTEAD OF triggers, if there are any
  */
  endOfLoop = sqlite3VdbeMakeLabel(v);
  if( tmask & TRIGGER_BEFORE ){

    int regCols = sqlite3GetTempRange(pParse, pTab->nCol+1);

    /* build the NEW.* reference row.  Note that if there is an INTEGER
    ** PRIMARY KEY into which a NULL is being inserted, that NULL will be
    ** translated into a unique ID for the row.  But on a BEFORE trigger,
    ** we do not know what the unique ID will be (because the insert has
    ** not happened yet) so we substitute a rowid of -1
    */

    if( keyColumn<0 ){
      sqlite3VdbeAddOp2(v, OP_Integer, -1, regCols);
    }else{
      int j1;
      if( useTempTable ){
        sqlite3VdbeAddOp3(v, OP_Column, srcTab, keyColumn, regCols);
      }else{
        assert( pSelect==0 );  /* Otherwise useTempTable is true */
        sqlite3ExprCode(pParse, pList->a[keyColumn].pExpr, regCols);
      }
      j1 = sqlite3VdbeAddOp1(v, OP_NotNull, regCols);
      sqlite3VdbeAddOp2(v, OP_Integer, -1, regCols);
      sqlite3VdbeJumpHere(v, j1);
      sqlite3VdbeAddOp1(v, OP_MustBeInt, regCols);
    }

    /* Cannot have triggers on a virtual table. If it were possible,
    ** this block would have to account for hidden column.
    */
    assert( !IsVirtual(pTab) );

    /* Create the new column data
    */

    for(i=0; i<pTab->nCol; i++){
      if( pColumn==0 ){
        j = i;
      }else{
        for(j=0; j<pColumn->nId; j++){
          if( pColumn->a[j].idx==i ) break;
        }
      }
      if( pColumn && j>=pColumn->nId ){
        sqlite3ExprCode(pParse, pTab->aCol[i].pDflt, regCols+i+1);
      }else if( useTempTable ){
        sqlite3VdbeAddOp3(v, OP_Column, srcTab, j, regCols+i+1); 
      }else{
        assert( pSelect==0 ); /* Otherwise useTempTable is true */
        sqlite3ExprCodeAndCache(pParse, pList->a[j].pExpr, regCols+i+1);
      }
    }

    /* If this is an INSERT on a view with an INSTEAD OF INSERT trigger,
    ** do not attempt any conversions before assembling the record.
    ** If this is a real table, attempt conversions as required by the
    ** table column affinities.
    */
    if( !isView ){
      sqlite3VdbeAddOp2(v, OP_Affinity, regCols+1, pTab->nCol);
      sqlite3TableAffinityStr(v, pTab);
    }

    /* Fire BEFORE or INSTEAD OF triggers */
    sqlite3CodeRowTrigger(pParse, pTrigger, TK_INSERT, 0, TRIGGER_BEFORE, 
        pTab, -1, regCols-pTab->nCol-1, onError, endOfLoop);


    sqlite3ReleaseTempRange(pParse, regCols, pTab->nCol+1);
  }

  /* Push the record number for the new entry onto the stack.  The
  ** record number is a randomly generate integer created by NewRowid
  ** except when the table has an INTEGER PRIMARY KEY column, in which
  ** case the record number is the same as that column. 
  */

  if( (db->flags & SQLITE_CountRows)!=0 ){
    sqlite3VdbeAddOp2(v, OP_AddImm, regRowCount, 1);
  }

  if( pTrigger ){
    /* Code AFTER triggers */
    sqlite3CodeRowTrigger(pParse, pTrigger, TK_INSERT, 0, TRIGGER_AFTER, 
        pTab, -1, regData-2-pTab->nCol, onError, endOfLoop);
  }

  /* The bottom of the main insertion loop, if the data source
  ** is a SELECT statement.
  */
  sqlite3VdbeResolveLabel(v, endOfLoop);
  if( useTempTable ){

  v = sqlite3GetVdbe(pParse);
  assert( v!=0 );
  assert( pTab->pSelect==0 );  /* This table is not a VIEW */
  nCol = pTab->nCol;
  regData = regRowid + 1;


  /* Test all NOT NULL constraints.
  */
  for(i=0; i<nCol; i++){
    if( i==pTab->iPKey ){
      continue;
    }
    onError = pTab->aCol[i].notNull;

      onError = overrideError;
    }else if( onError==OE_Default ){
      onError = OE_Abort;
    }
    
    if( onError!=OE_Replace || pTab->pIndex ){
      if( isUpdate ){
        j2 = sqlite3VdbeAddOp3(v, OP_Eq, regRowid, 0, rowidChng);
      }
      j3 = sqlite3VdbeAddOp3(v, OP_NotExists, baseCur, 0, regRowid);
      switch( onError ){
        default: {
          onError = OE_Abort;
          /* Fall thru into the next case */
        }

  db->nextPagesize = 0;
  db->flags |= SQLITE_ShortColNames
#if SQLITE_DEFAULT_FILE_FORMAT<4
                 | SQLITE_LegacyFileFmt
#endif
#ifdef SQLITE_ENABLE_LOAD_EXTENSION
                 | SQLITE_LoadExtension
#endif
#ifdef SQLITE_DISABLE_RECURSIVE_TRIGGERS
                 | SQLITE_NoRecTriggers
#endif
      ;
  sqlite3HashInit(&db->aCollSeq);
#ifndef SQLITE_OMIT_VIRTUALTABLE
  sqlite3HashInit(&db->aModule);
#endif

    /* The following is VERY experimental */
    { "writable_schema",          SQLITE_WriteSchema|SQLITE_RecoveryMode },
    { "omit_readlock",            SQLITE_NoReadlock    },

    /* TODO: Maybe it shouldn't be possible to change the ReadUncommitted
    ** flag if there are any active statements. */
    { "read_uncommitted",         SQLITE_ReadUncommitted },
    { "disable_recursive_triggers", SQLITE_NoRecTriggers },
  };
  int i;
  const struct sPragmaType *p;
  for(i=0, p=aPragma; i<ArraySize(aPragma); i++, p++){
    if( sqlite3StrICmp(zLeft, p->zName)==0 ){
      sqlite3 *db = pParse->db;
      Vdbe *v;

#define SQLITE_ReadUncommitted 0x00004000 /* For shared-cache mode */
#define SQLITE_LegacyFileFmt  0x00008000  /* Create new databases in format 1 */
#define SQLITE_FullFSync      0x00010000  /* Use full fsync on the backend */
#define SQLITE_LoadExtension  0x00020000  /* Enable load_extension */

#define SQLITE_RecoveryMode   0x00040000  /* Ignore schema errors */
#define SQLITE_ReverseOrder   0x00100000  /* Reverse unordered SELECTs */
#define SQLITE_NoRecTriggers  0x00200000  /* Disable recursive triggers */

/*
** Possible values for the sqlite.magic field.
** The numbers are obtained at random and have no special meaning, other
** than being distinct from one another.
*/
#define SQLITE_MAGIC_OPEN     0xa029a697  /* Database is open */

    **     INSERT OR REPLACE INTO t2 VALUES(new.a, new.b);
    **   END;
    **
    **   INSERT INTO t1 ... ;            -- insert into t2 uses REPLACE policy
    **   INSERT OR IGNORE INTO t1 ... ;  -- insert into t2 uses IGNORE policy
    */
    pParse->orconf = (orconfin==OE_Default)?pStep->orconf:orconfin;

    if( pStep->op!=TK_SELECT ){
      sqlite3VdbeAddOp1(v, OP_ResetCount, 0);
    }

    switch( pStep->op ){
      case TK_UPDATE: {
        sqlite3Update(pParse, 
          targetSrcList(pParse, pStep),
          sqlite3ExprListDup(db, pStep->pExprList, 0), 
          sqlite3ExprDup(db, pStep->pWhere, 0), 

        Select *pSelect = sqlite3SelectDup(db, pStep->pSelect, 0);
        sqlite3SelectDestInit(&sDest, SRT_Discard, 0);
        sqlite3Select(pParse, pSelect, &sDest);
        sqlite3SelectDelete(db, pSelect);
        break;
      }
    } 
    if( pStep->op!=TK_SELECT ){
      sqlite3VdbeAddOp1(v, OP_ResetCount, 1);
    }
    pStep = pStep->pNext;
  }
/* sqlite3VdbeAddOp2(v, OP_ContextPop, 0, 0); */

  return 0;
}

  pSubParse->pRoot = pRoot;

  /* Push an entry on to the auth context stack */
  sqlite3AuthContextPush(pParse, &sContext, pTrigger->name);

  v = sqlite3GetVdbe(pSubParse);
  if( v ){
    VdbeComment((v, "Start: %s.%s (%s %s%s%s ON %s)", 
      pTrigger->zName, onErrorText(orconf),
      (pTrigger->tr_tm==TRIGGER_BEFORE ? "BEFORE" : "AFTER"),
        (op==TK_UPDATE ? "UPDATE" : ""),
        (op==TK_INSERT ? "INSERT" : ""),
        (op==TK_DELETE ? "DELETE" : ""),
      pTab->zName
    ));
#ifndef SQLITE_OMIT_TRACE
    sqlite3VdbeChangeP4(v, -1, 
      sqlite3MPrintf(db, "-- TRIGGER %s", pTrigger->zName), P4_DYNAMIC
    );
#endif

    if( pTrigger->pWhen ){
      /* Code the WHEN clause. If it evaluates to false (or NULL) the 
      ** sub-vdbe is immediately halted.  */
      pWhen = sqlite3ExprDup(db, pTrigger->pWhen, 0);
      if( SQLITE_OK==sqlite3ResolveExprNames(&sNC, pWhen) ){
        iEndTrigger = sqlite3VdbeMakeLabel(v);
        sqlite3ExprIfFalse(pSubParse, pWhen, iEndTrigger, SQLITE_JUMPIFNULL);
      }
      sqlite3ExprDelete(db, pWhen);
    }

    /* Code the trigger program into the sub-vdbe. */
    codeTriggerProgram(pSubParse, pTrigger->step_list, orconf);
    if( iEndTrigger ){
      sqlite3VdbeResolveLabel(v, iEndTrigger);
    }
    sqlite3VdbeAddOp0(v, OP_Halt);
    VdbeComment((v, "End: %s.%s", pTrigger->zName, onErrorText(orconf)));

    transferParseError(pParse, pSubParse);
    pProgram->aOp = sqlite3VdbeTakeOpArray(v, &pProgram->nOp, &pParse->nArg);
    pProgram->nMem = pSubParse->nMem;
    pProgram->nCsr = pSubParse->nTab;
    pProgram->token = (void *)pTrigger;
    pC->oldmask = pSubParse->oldmask;
    pC->newmask = pSubParse->newmask;

      CodedTrigger *pC;
      pC = getRowTrigger(pParse, p, op, pTab, orconf);
      assert( pC || pParse->nErr || pParse->db->mallocFailed );

      /* Code the OP_Program opcode in the parent VDBE. P4 of the OP_Program 
      ** is a pointer to the sub-vdbe containing the trigger program.  */
      if( pC ){
        sqlite3VdbeAddOp3(v, OP_Program, oldIdx, ignoreJump, ++pParse->nMem);
        pC->pProgram->nRef++;
        sqlite3VdbeChangeP4(v, -1, (const char *)pC->pProgram, P4_SUBPROGRAM);
        VdbeComment((v, "Call: %s.%s", p->zName, onErrorText(orconf)));
      }
    }
  }
}

void sqlite3TriggerUses(
  Parse *pParse,       /* Parse context */

  /* Register Allocations */
  int regRowCount = 0;   /* A count of rows changed */
  int regOldRowid;       /* The old rowid */
  int regNewRowid;       /* The new rowid */
  int regNew;
  int regOld;
  int regRowSet = 0;     /* Rowset of rows to be updated */
  int regRec;            /* Register used for new table record to insert */

  memset(&sContext, 0, sizeof(sContext));
  db = pParse->db;
  if( pParse->nErr || db->mallocFailed ){
    goto update_cleanup;
  }
  assert( pTabList->nSrc==1 );

  /* Locate the table which we want to update. 
  */
  pTab = sqlite3SrcListLookup(pParse, pTabList);
  if( pTab==0 ) goto update_cleanup;
  iDb = sqlite3SchemaToIndex(pParse->db, pTab->pSchema);

  /* Figure out if we have any triggers and if the table being
  ** updated is a view.
  */
#ifndef SQLITE_OMIT_TRIGGER
  pTrigger = sqlite3TriggersExist(pParse, pTab, TK_UPDATE, pChanges, 0);
  isView = pTab->pSelect!=0;
#else
# define pTrigger 0
# define isView 0

    pParse->nMem += pTab->nCol;
  }
  if( chngRowid || pTrigger ){
    regNewRowid = ++pParse->nMem;
  }
  regNew = pParse->nMem + 1;
  pParse->nMem += pTab->nCol;
  regRec = ++pParse->nMem;

  /* Start the view context. */
  if( isView ){
    sqlite3AuthContextPush(pParse, &sContext, pTab->zName);
  }

  /* If there are any triggers, set old_col_mask and new_col_mask. */

        sqlite3VdbeAddOp3(v, OP_Column, iCur, i, regNew+i);
        sqlite3ColumnDefault(v, pTab, i, regNew+i);
      }else{
        sqlite3ExprCode(pParse, pChanges->a[j].pExpr, regNew+i);
      }
    }
  }

  /* If this is not a view, create the record that will be inserted into
  ** the table (assuming no constraint checks fail). A side effect of
  ** creating the record is applying affinity transformations to the
  ** array of registers populated by the block above. This needs to be
  ** done before the BEFORE triggers are fired.  */
#if 0
  if( !isView ){
    sqlite3VdbeAddOp3(v, OP_MakeRecord, regNew, pTab->nCol, regRec);
    sqlite3TableAffinityStr(v, pTab);
    sqlite3ExprCacheAffinityChange(pParse, regNew, pTab->nCol);
  }
#endif

  /* Fire any BEFORE UPDATE triggers. This happens before constraints are
  ** verified. One could argue that this is wrong.  */
  sqlite3CodeRowTrigger(pParse, pTrigger, TK_UPDATE, pChanges, 
      TRIGGER_BEFORE, pTab, -1, regOldRowid, onError, addr);

  if( !isView ){

    /* Do constraint checks. */
    sqlite3GenerateConstraintChecks(pParse, pTab, iCur, regNewRowid,
        aRegIdx, (chngRowid?regOldRowid:0), 1, onError, addr, 0);

    /* Delete the index entries associated with the current record.  */
    j1 = sqlite3VdbeAddOp3(v, OP_NotExists, iCur, 0, regOldRowid);
    sqlite3GenerateRowIndexDelete(pParse, pTab, iCur, aRegIdx);
  
    /* If changing the record number, delete the old record.  */
    if( chngRowid ){
      sqlite3VdbeAddOp2(v, OP_Delete, iCur, 0);
    }
    sqlite3VdbeJumpHere(v, j1);
  
    /* Insert the new index entries and the new record. */
    sqlite3CompleteInsertion(pParse, pTab, iCur, regNewRowid, aRegIdx, 1, -1, 0, 0);

#if 0
    for(i=0; i<nIdx; i++){
      if( aRegIdx[i] ){
        sqlite3VdbeAddOp2(v, OP_IdxInsert, iCur+1+i, aRegIdx[i]);
      }
    }
    sqlite3VdbeAddOp3(v, OP_Insert, iCur, regRec, regNewRowid);
    if( !pParse->nested ){
      sqlite3VdbeChangeP4(v, -1, pTab->zName, P4_STATIC);
      sqlite3VdbeChangeP5(v, OPFLAG_NCHANGE|OPFLAG_ISUPDATE);
    }
#endif
  }

  /* Increment the row counter 
  */
  if( (db->flags & SQLITE_CountRows) && !pParse->pTriggerTab){
    sqlite3VdbeAddOp2(v, OP_AddImm, regRowCount, 1);
  }

  sqlite3CodeRowTrigger(pParse, pTrigger, TK_UPDATE, pChanges, 
      TRIGGER_AFTER, pTab, -1, regOldRowid, onError, addr);

  /* Repeat the above with the next record to be updated, until
  ** all record selected by the WHERE clause have been updated.
  */
  sqlite3VdbeAddOp2(v, OP_Goto, 0, addr);
  sqlite3VdbeJumpHere(v, addr);

case OP_Halt: {
  if( pOp->p1==SQLITE_OK && p->pFrame ){
    VdbeFrame *pFrame = p->pFrame;
    p->pFrame = pFrame->pParent;
    p->nFrame--;
    pc = sqlite3VdbeFrameRestore(pFrame);
    if( pOp->p2==OE_Ignore ){
      pc = p->aOp[pc].p2-1;
    }
    break;
  }
  p->rc = pOp->p1;
  p->errorAction = (u8)pOp->p2;
  p->pc = pc;
  if( pOp->p4.z ){

/* Opcode: NewRowid P1 P2 P3 * *
**
** Get a new integer record number (a.k.a "rowid") used as the key to a table.
** The record number is not previously used as a key in the database
** table that cursor P1 points to.  The new record number is written
** written to register P2.
**
** If P3>0 then P3 is a register in the root frame of this VDBE that holds 
** the largest previously generated record number. No new record numbers are
** allowed to be less than this value. When this value reaches its maximum, 
** a SQLITE_FULL error is generated. The P3 register is updated with the '
** generated record number. This P3 mechanism is used to help implement the
** AUTOINCREMENT feature.
*/
case OP_NewRowid: {           /* out2-prerelease */
  i64 v;                 /* The new rowid */
  VdbeCursor *pC;        /* Cursor of table to get the new rowid */
  int res;               /* Result of an sqlite3BtreeLast() */
  int cnt;               /* Counter to limit the number of searches */
  Mem *pMem;             /* Register holding largest rowid for AUTOINCREMENT */
  VdbeFrame *pFrame;     /* Root frame of VDBE */

  v = 0;
  res = 0;
  assert( pOp->p1>=0 && pOp->p1<p->nCursor );
  pC = p->apCsr[pOp->p1];
  assert( pC!=0 );
  if( NEVER(pC->pCursor==0) ){

            v++;
          }
        }
      }

#ifndef SQLITE_OMIT_AUTOINCREMENT
      if( pOp->p3 ){
        if( p->pFrame ){
          for(pFrame=p->pFrame; pFrame->pParent; pFrame=pFrame->pParent);
          pMem = &pFrame->aMem[pOp->p3];
        }else{
          pMem = &p->aMem[pOp->p3];
        }
        /* Assert that P3 is a valid memory cell. */
        assert( pOp->p3>0 && pOp->p3<=(p->pFrame ? pFrame->nMem : p->nMem) );

        REGISTER_TRACE(pOp->p3, pMem);
        sqlite3VdbeMemIntegerify(pMem);
        assert( (pMem->flags & MEM_Int)!=0 );  /* mem(P3) holds an integer */
        if( pMem->u.i==MAX_ROWID || pC->useRandomRowid ){
          rc = SQLITE_FULL;
          goto abort_due_to_error;
        }
        if( v<pMem->u.i+1 ){

    sqlite3RowSetInsert(pIn1->u.pRowSet, pIn3->u.i);
  }
  break;
}


#ifndef SQLITE_OMIT_TRIGGER

























/* Opcode: Program P1 P2 P3 P4 *
**












** Execute the trigger program passed as P4 (type P4_SUBPROGRAM). 

**
** P1 contains the address of the memory cell that contains the first memory 
** cell in an array of values used as arguments to the sub-program. P2 
** contains the address to jump to if the sub-program throws an IGNORE 
** exception using the RAISE() function. Register P3 contains the address 



** of a memory cell in this (the parent) VM that is used to allocate the 
** memory required by the sub-vdbe at runtime.

**
** P4 is a pointer to the VM containing the trigger program.
*/
case OP_Program: {        /* jump */
  VdbeFrame *pFrame;
  SubProgram *pProgram = pOp->p4.pProgram;
  Mem *pRt = &p->aMem[pOp->p3];        /* Register to allocate runtime space */
  assert( pProgram->nOp>0 );
  
  /* If the SQLITE_NoRecTriggers flag it set, then recursive invocation of
  ** triggers is disabled for backwards compatibility (flag set/cleared by
  ** the "PRAGMA disable_recursive_triggers" command). 
  ** 
  ** It is recursive invocation of triggers, at the SQL level, that is 
  ** disabled. In some cases a single trigger may generate more than one 
  ** SubProgram (if the trigger may be executed with more than one different 
  ** ON CONFLICT algorithm). SubProgram structures associated with a
  ** single trigger all have the same value for the SubProgram.token 
  ** variable.
  */
  if( db->flags&SQLITE_NoRecTriggers ){
    void *t = pProgram->token;
    for(pFrame=p->pFrame; pFrame && pFrame->token!=t; pFrame=pFrame->pParent);
    if( pFrame ) break;
  }

  /* TODO: This constant should be configurable. */
  if( p->nFrame>1000 ){

    assert( pProgram->nMem+pProgram->nCsr==pFrame->nChildMem );
    assert( pProgram->nCsr==pFrame->nChildCsr );
    assert( pc==pFrame->pc );
  }

  p->nFrame++;
  pFrame->pParent = p->pFrame;
  pFrame->lastRowid = db->lastRowid;
  pFrame->nChange = p->nChange;
  p->pFrame = pFrame;
  p->aMem = &VdbeFrameMem(pFrame)[-1];
  p->nMem = pFrame->nChildMem;
  p->nCursor = pFrame->nChildCsr;
  p->apCsr = (VdbeCursor **)&p->aMem[p->nMem+1];
  p->aOp = pProgram->aOp;
  p->nOp = pProgram->nOp;
  pc = -1;

  break;
}

/* Opcode: Param P1 P2 * * *
**
** This opcode is only ever present in sub-programs called via the 
** OP_Program instruction. Copy a value currently stored in a memory 
** cell of the calling (parent) frame to cell P2 in the current frames 
** address space. This is used by trigger programs to access the new.* 
** and old.* values.
**


** The address of the cell in the parent frame is determined by adding


** the value of the P1 argument to the value of the P1 argument to the
** calling OP_Program instruction.
*/
case OP_Param: {           /* out2-prerelease */
  VdbeFrame *pFrame = p->pFrame;
  Mem *pIn = &pFrame->aMem[pOp->p1 + pFrame->aOp[pFrame->pc].p1];   



  sqlite3VdbeMemShallowCopy(pOut, pIn, MEM_Ephem);
  break;
}

#endif /* #ifndef SQLITE_OMIT_TRIGGER */

#ifndef SQLITE_OMIT_AUTOINCREMENT
/* Opcode: MemMax P1 P2 * * *
**
** P1 is a register in the root frame of this VM (the root frame is
** different from the current frame if this instruction is being executed
** within a sub-program). Set the value of register P1 to the maximum of 
** its current value and the value in register P2.
**
** This instruction throws an error if the memory cell is not initially
** an integer.
*/
case OP_MemMax: {        /* in2 */
  Mem *pIn1;
  VdbeFrame *pFrame;
  if( p->pFrame ){
    for(pFrame=p->pFrame; pFrame->pParent; pFrame=pFrame->pParent);
    pIn1 = &pFrame->aMem[pOp->p1];
  }else{
    pIn1 = &p->aMem[pOp->p1];
  }
  sqlite3VdbeMemIntegerify(pIn1);
  sqlite3VdbeMemIntegerify(pIn2);
  if( pIn1->u.i<pIn2->u.i){
    pIn1->u.i = pIn2->u.i;
  }
  break;
}

  int nMem;               /* Number of entries in aMem */
  VdbeCursor **apCsr;     /* Element of Vdbe cursors */
  u16 nCursor;            /* Number of entries in apCsr */
  VdbeFrame *pParent;     /* Parent of this frame */
  void *token;            /* Copy of SubProgram.token */
  int nChildMem;          /* Number of memory cells for child frame */
  int nChildCsr;          /* Number of cursors for child frame */
  i64 lastRowid;    /* Last insert rowid (sqlite3.lastRowid) */
  int nChange;      /* Statement changes (Vdbe.nChanges)     */
};

#define VdbeFrameMem(p) ((Mem *)&((u8 *)p)[ROUND8(sizeof(VdbeFrame))])

/*
** A value for VdbeCursor.cacheValid that means the cache is always invalid.
*/

*/
typedef struct Set Set;
struct Set {
  Hash hash;             /* A set is just a hash table */
  HashElem *prev;        /* Previously accessed hash elemen */
};
















/*
** An instance of the virtual machine.  This structure contains the complete
** state of the virtual machine.
**
** The "sqlite3_stmt" structure pointer that is returned by sqlite3_compile()
** is really a pointer to an instance of this structure.
**

  u16 nVar;               /* Number of entries in aVar[] */
  Mem *aVar;              /* Values for the OP_Variable opcode. */
  char **azVar;           /* Name of variables */
  u32 magic;              /* Magic number for sanity checking */
  int nMem;               /* Number of memory locations currently allocated */
  Mem *aMem;              /* The memory locations */
  int cacheCtr;           /* VdbeCursor row cache generation counter */



  int pc;                 /* The program counter */
  int rc;                 /* Value to return */
  char *zErrMsg;          /* Error message written here */
  u8 explain;             /* True if EXPLAIN present on SQL command */
  u8 changeCntOn;         /* True to update the change-counter */
  u8 expired;             /* True if the VM needs to be recompiled */
  u8 minWriteFileFormat;  /* Minimum file format for writable database files */

      hasStatementBegin = 1;
      p->usesStmtJournal = 1;
    }else if( opcode==OP_Destroy ){
      doesStatementRollback = 1;
    }else if( opcode==OP_Transaction && pOp->p2!=0 ){
      p->readOnly = 0;
#ifndef SQLITE_OMIT_VIRTUALTABLE
    }else if( opcode==OP_VUpdate || opcode==OP_VRename || opcode==OP_Program ){
      doesStatementRollback = 1;
    }else if( opcode==OP_VFilter ){
      int n;
      assert( p->nOp - i >= 3 );
      assert( pOp[-1].opcode==OP_Integer );
      n = pOp[-1].p1;
      if( n>nMaxArgs ) nMaxArgs = n;

  Vdbe *v = pFrame->v;
  v->aOp = pFrame->aOp;
  v->nOp = pFrame->nOp;
  v->aMem = pFrame->aMem;
  v->nMem = pFrame->nMem;
  v->apCsr = pFrame->apCsr;
  v->nCursor = pFrame->nCursor;
  v->db->lastRowid = pFrame->lastRowid;
  v->nChange = pFrame->nChange;
  return pFrame->pc;
}

/*
** Close all cursors. 
**
** Also release any dynamic memory held by the VM in the Vdbe.aMem memory 

  /* Execute assert() statements to ensure that the Vdbe.apCsr[] and 
  ** Vdbe.aMem[] arrays have already been cleaned up.  */
  int i;
  for(i=0; i<p->nCursor; i++){ assert( p->apCsr[i]==0 ); }
  for(i=1; i<=p->nMem; i++){ assert( p->aMem[i].flags==MEM_Null ); }
#endif







  sqlite3DbFree(db, p->zErrMsg);
  p->zErrMsg = 0;
  p->pResultSet = 0;
}

/*
** Set the number of result columns that will be returned by this SQL

    INSERT INTO t2 VALUES(NULL, 1);
    CREATE TABLE t3(a INTEGER PRIMARY KEY AUTOINCREMENT, b);
    INSERT INTO t3 SELECT * FROM t2 WHERE y>1;

    SELECT * FROM sqlite_sequence WHERE name='t3';
  }
} {t3 0}

catchsql { pragma disable_recursive_triggers = 1 } 

# Ticket #3928.  Make sure that triggers to not make extra slots in
# the SQLITE_SEQUENCE table.
#
do_test autoinc-3928.1 {
  db eval {
    CREATE TABLE t3928(a INTEGER PRIMARY KEY AUTOINCREMENT, b);

# left out of other test files.
#
# $Id: misc2.test,v 1.28 2007/09/12 17:01:45 danielk1977 Exp $

set testdir [file dirname $argv0]
source $testdir/tester.tcl

# The tests in this file were written before SQLite supported recursive
# trigger invocation, and some tests depend on that to pass. So disable
# recursive triggers for this file.
catchsql { pragma disable_recursive_triggers = 1 } 

ifcapable {trigger} {
# Test for ticket #360
#
do_test misc2-1.1 {
  catchsql {
    CREATE TABLE FOO(bar integer);
    CREATE TRIGGER foo_insert BEFORE INSERT ON foo BEGIN

    execsql {SELECT * FROM t1}
  } {1 2 3 4 5 6 7 8 9 10}
}

db close
file delete -force test.db
sqlite3 db test.db
catchsql { pragma disable_recursive_triggers = 1 } 

# Ticket #453.  If the SQL ended with "-", the tokenizer was calling that
# an incomplete token, which caused problem.  The solution was to just call
# it a minus sign.
#
do_test misc2-8.1 {
  catchsql {-}

set testdir [file dirname $argv0]
source $testdir/tester.tcl
ifcapable {!trigger} {
  finish_test
  return
}

# The tests in this file were written before SQLite supported recursive
# trigger invocation, and some tests depend on that to pass. So disable
# recursive triggers for this file.
catchsql { pragma disable_recursive_triggers = 1 } 

do_test tkt3731-1.1 {
  execsql {
    CREATE TABLE t1(a PRIMARY KEY, b);
    CREATE TRIGGER tr1 AFTER INSERT ON t1 BEGIN
      INSERT INTO t1 VALUES(new.a || '+', new.b || '+');
    END;

    CREATE TABLE parameters2(
       mountcnt    INT NOT NULL CHECK (typeof(mountcnt) == 'integer'),
       version     REAL CHECK (typeof(version) == 'real')
    );
    INSERT INTO parameters2(mountcnt, version) VALUES(1, 1.0);
  }
} {}
puts [execsql { SELECT *,typeof(mountcnt),typeof(version) FROM parameters1 }]

do_test tkt3992-1.2 {
  execsql {
    UPDATE parameters1 SET mountcnt = mountcnt + 1;
    SELECT * FROM parameters1;
  }
} {2 1.0}

do_test tkt3992-1.3 {
    explain { UPDATE parameters2 SET mountcnt = mountcnt + 1 }
breakpoint
  execsql {
  pragma vdbe_trace = 1;
    UPDATE parameters2 SET mountcnt = mountcnt + 1;
  pragma vdbe_trace = 0;
    SELECT * FROM parameters2;
  }
} {2 1.0}

do_test tkt3992-2.1 {
  execsql {
    CREATE TABLE t1(a, b);

      SELECT tcl('set res', typeof(new.c));
    END;

    UPDATE t2 SET a = 'I';
  }
  set res
} {real}





finish_test

set testdir [file dirname $argv0]
source $testdir/tester.tcl
ifcapable {!trigger} {
  finish_test
  return
}

# The tests in this file were written before SQLite supported recursive
# trigger invocation, and some tests depend on that to pass. So disable
# recursive triggers for this file.
catchsql { pragma disable_recursive_triggers = 1 } 

# 1.
ifcapable subquery {
  set ii 0
  set tbl_definitions [list \
  	{CREATE TABLE tbl (a, b);}                                      \
  	{CREATE TABLE tbl (a INTEGER PRIMARY KEY, b);}                  \

set testdir [file dirname $argv0]
source $testdir/tester.tcl
ifcapable {!trigger} {
  finish_test
  return
}

# The tests in this file were written before SQLite supported recursive }
# trigger invocation, and some tests depend on that to pass. So disable
# recursive triggers for this file.
catchsql { pragma disable_recursive_triggers = 1 } 

# Test that we can cause ROLLBACK, FAIL and ABORT correctly


#
catchsql { CREATE TABLE tbl(a, b ,c) }
execsql {
    CREATE TRIGGER before_tbl_insert BEFORE INSERT ON tbl BEGIN SELECT CASE 
	WHEN (new.a = 4) THEN RAISE(IGNORE) END;
    END;

    CREATE TRIGGER after_tbl_insert AFTER INSERT ON tbl BEGIN SELECT CASE 
	WHEN (new.a = 1) THEN RAISE(ABORT,    'Trigger abort') 

do_test trigger3-1.3 {
    execsql {SELECT * FROM tbl}
} {}

# FAIL
do_test trigger3-2.1 {
    catchsql {
        BEGIN;
        INSERT INTO tbl VALUES (5, 5, 6);
        INSERT INTO tbl VALUES (2, 5, 6);
    }
} {1 {Trigger fail}}
do_test trigger3-2.2 {
    execsql {
	SELECT * FROM tbl;

      END;
      DELETE FROM t1;
      SELECT * FROM t2;
  }
} {1 2 3}
do_test trigger9-1.3.2 {
  has_rowdata {DELETE FROM t1}
} 0
do_test trigger9-1.3.3 { execsql { ROLLBACK } } {}

do_test trigger9-1.4.1 {
  execsql {
    BEGIN;
      CREATE TRIGGER trig1 BEFORE DELETE ON t1 WHEN old.x='1' BEGIN
        INSERT INTO t2 VALUES(old.rowid);
      END;
      DELETE FROM t1;
      SELECT * FROM t2;
  }
} {1}
do_test trigger9-1.4.2 {
  has_rowdata {DELETE FROM t1}
} 0
do_test trigger9-1.4.3 { execsql { ROLLBACK } } {}

do_test trigger9-1.5.1 {
  execsql {
    BEGIN;
      CREATE TRIGGER trig1 BEFORE UPDATE ON t1 BEGIN
        INSERT INTO t2 VALUES(old.rowid);

      END;
      UPDATE t1 SET y = '';
      SELECT * FROM t2;
  }
} {1 2 3}
do_test trigger9-1.6.2 {
  has_rowdata {UPDATE t1 SET y = ''}
} 0
do_test trigger9-1.6.3 { execsql { ROLLBACK } } {}

do_test trigger9-1.7.1 {
  execsql {
    BEGIN;
      CREATE TRIGGER trig1 BEFORE UPDATE ON t1 WHEN old.x>='2' BEGIN
        INSERT INTO t2 VALUES(old.x);
      END;
      UPDATE t1 SET y = '';
      SELECT * FROM t2;
  }
} {2 3}
do_test trigger9-1.7.2 {
  has_rowdata {UPDATE t1 SET y = ''}
} 0
do_test trigger9-1.7.3 { execsql { ROLLBACK } } {}

do_test trigger9-3.1 {
  execsql {
    CREATE TABLE t3(a, b);
    INSERT INTO t3 VALUES(1, 'one');
    INSERT INTO t3 VALUES(2, 'two');