delete.lo expr.lo fault.lo func.lo global.lo \
        hash.lo journal.lo insert.lo legacy.lo loadext.lo \
        main.lo malloc.lo mem0.lo mem1.lo mem2.lo mem3.lo mem5.lo \
        memjournal.lo \
        mutex.lo mutex_noop.lo mutex_os2.lo mutex_unix.lo mutex_w32.lo \
        opcodes.lo os.lo os_unix.lo os_win.lo os_os2.lo \
        pager.lo parse.lo pcache.lo pcache1.lo pragma.lo prepare.lo printf.lo \
        random.lo resolve.lo select.lo status.lo \
        table.lo tokenize.lo trigger.lo update.lo \
        util.lo vacuum.lo \
        vdbe.lo vdbeapi.lo vdbeaux.lo vdbeblob.lo vdbefifo.lo vdbemem.lo \
        walker.lo where.lo utf.lo vtab.lo

# Object files for the amalgamation.
#
OBJS1 = sqlite3.lo

# Determine the real value of LIBOBJ based on the 'configure' script
................................................................................
  $(TOP)/src/pcache.h \
  $(TOP)/src/pcache1.c \
  $(TOP)/src/pragma.c \
  $(TOP)/src/prepare.c \
  $(TOP)/src/printf.c \
  $(TOP)/src/random.c \
  $(TOP)/src/resolve.c \

  $(TOP)/src/select.c \
  $(TOP)/src/status.c \
  $(TOP)/src/shell.c \
  $(TOP)/src/sqlite.h.in \
  $(TOP)/src/sqlite3ext.h \
  $(TOP)/src/sqliteInt.h \
  $(TOP)/src/sqliteLimit.h \
................................................................................
  $(TOP)/src/util.c \
  $(TOP)/src/vacuum.c \
  $(TOP)/src/vdbe.c \
  $(TOP)/src/vdbe.h \
  $(TOP)/src/vdbeapi.c \
  $(TOP)/src/vdbeaux.c \
  $(TOP)/src/vdbeblob.c \
  $(TOP)/src/vdbefifo.c \
  $(TOP)/src/vdbemem.c \
  $(TOP)/src/vdbeInt.h \
  $(TOP)/src/vtab.c \
  $(TOP)/src/walker.c \
  $(TOP)/src/where.c

# Generated source code files
................................................................................
	$(LTCOMPILE) -c $(TOP)/src/printf.c

random.lo:	$(TOP)/src/random.c $(HDR)
	$(LTCOMPILE) -c $(TOP)/src/random.c

resolve.lo:	$(TOP)/src/resolve.c $(HDR)
	$(LTCOMPILE) -c $(TOP)/src/resolve.c




select.lo:	$(TOP)/src/select.c $(HDR)
	$(LTCOMPILE) -c $(TOP)/src/select.c

status.lo:	$(TOP)/src/status.c $(HDR)
	$(LTCOMPILE) -c $(TOP)/src/status.c

................................................................................

vdbeaux.lo:	$(TOP)/src/vdbeaux.c $(HDR)
	$(LTCOMPILE) -c $(TOP)/src/vdbeaux.c

vdbeblob.lo:	$(TOP)/src/vdbeblob.c $(HDR)
	$(LTCOMPILE) -c $(TOP)/src/vdbeblob.c

vdbefifo.lo:	$(TOP)/src/vdbefifo.c $(HDR)
	$(LTCOMPILE) -c $(TOP)/src/vdbefifo.c

vdbemem.lo:	$(TOP)/src/vdbemem.c $(HDR)
	$(LTCOMPILE) -c $(TOP)/src/vdbemem.c

vtab.lo:	$(TOP)/src/vtab.c $(HDR)
	$(LTCOMPILE) -c $(TOP)/src/vtab.c

walker.lo:	$(TOP)/src/walker.c $(HDR)

        delete.lo expr.lo fault.lo func.lo global.lo \
        hash.lo journal.lo insert.lo legacy.lo loadext.lo \
        main.lo malloc.lo mem0.lo mem1.lo mem2.lo mem3.lo mem5.lo \
        memjournal.lo \
        mutex.lo mutex_noop.lo mutex_os2.lo mutex_unix.lo mutex_w32.lo \
        opcodes.lo os.lo os_unix.lo os_win.lo os_os2.lo \
        pager.lo parse.lo pcache.lo pcache1.lo pragma.lo prepare.lo printf.lo \
        random.lo resolve.lo rowset.lo select.lo status.lo \
        table.lo tokenize.lo trigger.lo update.lo \
        util.lo vacuum.lo \
        vdbe.lo vdbeapi.lo vdbeaux.lo vdbeblob.lo vdbemem.lo \
        walker.lo where.lo utf.lo vtab.lo

# Object files for the amalgamation.
#
OBJS1 = sqlite3.lo

# Determine the real value of LIBOBJ based on the 'configure' script
................................................................................
  $(TOP)/src/pcache.h \
  $(TOP)/src/pcache1.c \
  $(TOP)/src/pragma.c \
  $(TOP)/src/prepare.c \
  $(TOP)/src/printf.c \
  $(TOP)/src/random.c \
  $(TOP)/src/resolve.c \
  $(TOP)/src/rowset.c \
  $(TOP)/src/select.c \
  $(TOP)/src/status.c \
  $(TOP)/src/shell.c \
  $(TOP)/src/sqlite.h.in \
  $(TOP)/src/sqlite3ext.h \
  $(TOP)/src/sqliteInt.h \
  $(TOP)/src/sqliteLimit.h \
................................................................................
  $(TOP)/src/util.c \
  $(TOP)/src/vacuum.c \
  $(TOP)/src/vdbe.c \
  $(TOP)/src/vdbe.h \
  $(TOP)/src/vdbeapi.c \
  $(TOP)/src/vdbeaux.c \
  $(TOP)/src/vdbeblob.c \

  $(TOP)/src/vdbemem.c \
  $(TOP)/src/vdbeInt.h \
  $(TOP)/src/vtab.c \
  $(TOP)/src/walker.c \
  $(TOP)/src/where.c

# Generated source code files
................................................................................
	$(LTCOMPILE) -c $(TOP)/src/printf.c

random.lo:	$(TOP)/src/random.c $(HDR)
	$(LTCOMPILE) -c $(TOP)/src/random.c

resolve.lo:	$(TOP)/src/resolve.c $(HDR)
	$(LTCOMPILE) -c $(TOP)/src/resolve.c

rowset.lo:	$(TOP)/src/rowset.c $(HDR)
	$(LTCOMPILE) -c $(TOP)/src/rowset.c

select.lo:	$(TOP)/src/select.c $(HDR)
	$(LTCOMPILE) -c $(TOP)/src/select.c

status.lo:	$(TOP)/src/status.c $(HDR)
	$(LTCOMPILE) -c $(TOP)/src/status.c

................................................................................

vdbeaux.lo:	$(TOP)/src/vdbeaux.c $(HDR)
	$(LTCOMPILE) -c $(TOP)/src/vdbeaux.c

vdbeblob.lo:	$(TOP)/src/vdbeblob.c $(HDR)
	$(LTCOMPILE) -c $(TOP)/src/vdbeblob.c




vdbemem.lo:	$(TOP)/src/vdbemem.c $(HDR)
	$(LTCOMPILE) -c $(TOP)/src/vdbemem.c

vtab.lo:	$(TOP)/src/vtab.c $(HDR)
	$(LTCOMPILE) -c $(TOP)/src/vtab.c

walker.lo:	$(TOP)/src/walker.c $(HDR)

         func.o global.o hash.o \
         icu.o insert.o journal.o legacy.o loadext.o \
         main.o malloc.o mem0.o mem1.o mem2.o mem3.o mem5.o \
         memjournal.o \
         mutex.o mutex_noop.o mutex_os2.o mutex_unix.o mutex_w32.o \
         opcodes.o os.o os_os2.o os_unix.o os_win.o \
         pager.o parse.o pcache.o pcache1.o pragma.o prepare.o printf.o \
         random.o resolve.o rtree.o select.o status.o \
         table.o tokenize.o trigger.o \
         update.o util.o vacuum.o \
         vdbe.o vdbeapi.o vdbeaux.o vdbeblob.o vdbefifo.o vdbemem.o \
         walker.o where.o utf.o vtab.o



# All of the source code files.
#
SRC = \
................................................................................
  $(TOP)/src/pcache.h \
  $(TOP)/src/pcache1.c \
  $(TOP)/src/pragma.c \
  $(TOP)/src/prepare.c \
  $(TOP)/src/printf.c \
  $(TOP)/src/random.c \
  $(TOP)/src/resolve.c \

  $(TOP)/src/select.c \
  $(TOP)/src/status.c \
  $(TOP)/src/shell.c \
  $(TOP)/src/sqlite.h.in \
  $(TOP)/src/sqlite3ext.h \
  $(TOP)/src/sqliteInt.h \
  $(TOP)/src/sqliteLimit.h \
................................................................................
  $(TOP)/src/util.c \
  $(TOP)/src/vacuum.c \
  $(TOP)/src/vdbe.c \
  $(TOP)/src/vdbe.h \
  $(TOP)/src/vdbeapi.c \
  $(TOP)/src/vdbeaux.c \
  $(TOP)/src/vdbeblob.c \
  $(TOP)/src/vdbefifo.c \
  $(TOP)/src/vdbemem.c \
  $(TOP)/src/vdbeInt.h \
  $(TOP)/src/vtab.c \
  $(TOP)/src/walker.c \
  $(TOP)/src/where.c

# Source code for extensions

         func.o global.o hash.o \
         icu.o insert.o journal.o legacy.o loadext.o \
         main.o malloc.o mem0.o mem1.o mem2.o mem3.o mem5.o \
         memjournal.o \
         mutex.o mutex_noop.o mutex_os2.o mutex_unix.o mutex_w32.o \
         opcodes.o os.o os_os2.o os_unix.o os_win.o \
         pager.o parse.o pcache.o pcache1.o pragma.o prepare.o printf.o \
         random.o resolve.o rowset.o rtree.o select.o status.o \
         table.o tokenize.o trigger.o \
         update.o util.o vacuum.o \
         vdbe.o vdbeapi.o vdbeaux.o vdbeblob.o vdbemem.o \
         walker.o where.o utf.o vtab.o



# All of the source code files.
#
SRC = \
................................................................................
  $(TOP)/src/pcache.h \
  $(TOP)/src/pcache1.c \
  $(TOP)/src/pragma.c \
  $(TOP)/src/prepare.c \
  $(TOP)/src/printf.c \
  $(TOP)/src/random.c \
  $(TOP)/src/resolve.c \
  $(TOP)/src/rowset.c \
  $(TOP)/src/select.c \
  $(TOP)/src/status.c \
  $(TOP)/src/shell.c \
  $(TOP)/src/sqlite.h.in \
  $(TOP)/src/sqlite3ext.h \
  $(TOP)/src/sqliteInt.h \
  $(TOP)/src/sqliteLimit.h \
................................................................................
  $(TOP)/src/util.c \
  $(TOP)/src/vacuum.c \
  $(TOP)/src/vdbe.c \
  $(TOP)/src/vdbe.h \
  $(TOP)/src/vdbeapi.c \
  $(TOP)/src/vdbeaux.c \
  $(TOP)/src/vdbeblob.c \

  $(TOP)/src/vdbemem.c \
  $(TOP)/src/vdbeInt.h \
  $(TOP)/src/vtab.c \
  $(TOP)/src/walker.c \
  $(TOP)/src/where.c

# Source code for extensions

**    May you find forgiveness for yourself and forgive others.
**    May you share freely, never taking more than you give.
**
*************************************************************************
** This file contains C code routines that are called by the parser
** in order to generate code for DELETE FROM statements.
**
** $Id: delete.c,v 1.187 2008/11/19 09:05:27 danielk1977 Exp $
*/
#include "sqliteInt.h"

/*
** Look up every table that is named in pSrc.  If any table is not found,
** add an error message to pParse->zErrMsg and return NULL.  If all tables
** are found, return a pointer to the last table.
................................................................................
  }else
#endif /* SQLITE_OMIT_TRUNCATE_OPTIMIZATION */
  /* The usual case: There is a WHERE clause so we have to scan through
  ** the table and pick which records to delete.
  */
  {
    int iRowid = ++pParse->nMem;    /* Used for storing rowid values. */


    /* Begin the database scan
    */
    pWInfo = sqlite3WhereBegin(pParse, pTabList, pWhere, 0, 0);
    if( pWInfo==0 ) goto delete_from_cleanup;

    /* Remember the rowid of every item to be deleted.
    */
    sqlite3VdbeAddOp2(v, IsVirtual(pTab) ? OP_VRowid : OP_Rowid, iCur, iRowid);
    sqlite3VdbeAddOp1(v, OP_FifoWrite, iRowid);
    if( db->flags & SQLITE_CountRows ){
      sqlite3VdbeAddOp2(v, OP_AddImm, memCnt, 1);
    }

    /* End the database scan loop.
    */
    sqlite3WhereEnd(pWInfo);
................................................................................

    /* This is the beginning of the delete loop. If a trigger encounters
    ** an IGNORE constraint, it jumps back to here.
    */
    if( triggers_exist ){
      sqlite3VdbeResolveLabel(v, addr);
    }
    addr = sqlite3VdbeAddOp2(v, OP_FifoRead, iRowid, end);

    if( triggers_exist ){
      int iData = ++pParse->nMem;   /* For storing row data of OLD table */

      /* If the record is no longer present in the table, jump to the
      ** next iteration of the loop through the contents of the fifo.
      */

**    May you find forgiveness for yourself and forgive others.
**    May you share freely, never taking more than you give.
**
*************************************************************************
** This file contains C code routines that are called by the parser
** in order to generate code for DELETE FROM statements.
**
** $Id: delete.c,v 1.188 2008/12/04 20:40:10 drh Exp $
*/
#include "sqliteInt.h"

/*
** Look up every table that is named in pSrc.  If any table is not found,
** add an error message to pParse->zErrMsg and return NULL.  If all tables
** are found, return a pointer to the last table.
................................................................................
  }else
#endif /* SQLITE_OMIT_TRUNCATE_OPTIMIZATION */
  /* The usual case: There is a WHERE clause so we have to scan through
  ** the table and pick which records to delete.
  */
  {
    int iRowid = ++pParse->nMem;    /* Used for storing rowid values. */
    int iRowSet = ++pParse->nMem;   /* Register for rowset of rows to delete */

    /* Begin the database scan
    */
    pWInfo = sqlite3WhereBegin(pParse, pTabList, pWhere, 0, 0);
    if( pWInfo==0 ) goto delete_from_cleanup;

    /* Remember the rowid of every item to be deleted.
    */
    sqlite3VdbeAddOp2(v, IsVirtual(pTab) ? OP_VRowid : OP_Rowid, iCur, iRowid);
    sqlite3VdbeAddOp2(v, OP_RowSetAdd, iRowSet, iRowid);
    if( db->flags & SQLITE_CountRows ){
      sqlite3VdbeAddOp2(v, OP_AddImm, memCnt, 1);
    }

    /* End the database scan loop.
    */
    sqlite3WhereEnd(pWInfo);
................................................................................

    /* This is the beginning of the delete loop. If a trigger encounters
    ** an IGNORE constraint, it jumps back to here.
    */
    if( triggers_exist ){
      sqlite3VdbeResolveLabel(v, addr);
    }
    addr = sqlite3VdbeAddOp3(v, OP_RowSetRead, iRowSet, end, iRowid);

    if( triggers_exist ){
      int iData = ++pParse->nMem;   /* For storing row data of OLD table */

      /* If the record is no longer present in the table, jump to the
      ** next iteration of the loop through the contents of the fifo.
      */

**    May you do good and not evil.
**    May you find forgiveness for yourself and forgive others.
**    May you share freely, never taking more than you give.
**
*************************************************************************
** This file implements that page cache.
**
** @(#) $Id: pcache.c,v 1.38 2008/11/19 16:52:44 danielk1977 Exp $
*/
#include "sqliteInt.h"

/*
** A complete page cache is an instance of this structure.
*/
struct PCache {
................................................................................
void sqlite3PcacheIterateDirty(PCache *pCache, void (*xIter)(PgHdr *)){
  PgHdr *pDirty;
  for(pDirty=pCache->pDirty; pDirty; pDirty=pDirty->pDirtyNext){
    xIter(pDirty);
  }
}
#endif

**    May you do good and not evil.
**    May you find forgiveness for yourself and forgive others.
**    May you share freely, never taking more than you give.
**
*************************************************************************
** This file implements that page cache.
**
** @(#) $Id: pcache.c,v 1.39 2008/12/04 20:40:10 drh Exp $
*/
#include "sqliteInt.h"

/*
** A complete page cache is an instance of this structure.
*/
struct PCache {
................................................................................
void sqlite3PcacheIterateDirty(PCache *pCache, void (*xIter)(PgHdr *)){
  PgHdr *pDirty;
  for(pDirty=pCache->pDirty; pDirty; pDirty=pDirty->pDirtyNext){
    xIter(pDirty);
  }
}
#endif

/*
** 2008 December 3
**
** The author disclaims copyright to this source code.  In place of
** a legal notice, here is a blessing:
**
**    May you do good and not evil.
**    May you find forgiveness for yourself and forgive others.
**    May you share freely, never taking more than you give.
**
*************************************************************************
**
** This module implements an object we call a "Row Set".
**
** The RowSet object is a bag of rowids.  Rowids
** are inserted into the bag in an arbitrary order.  Then they are
** pulled from the bag in sorted order.  Rowids only appear in the
** bag once.  If the same rowid is inserted multiple times, the
** second and subsequent inserts make no difference on the output.
**
** This implementation accumulates rowids in a linked list.  For
** output, it first sorts the linked list (removing duplicates during
** the sort) then returns elements one by one by walking the list.
**
** Big chunks of rowid/next-ptr pairs are allocated at a time, to
** reduce the malloc overhead.
*/
#include "sqliteInt.h"

/*
** The number of rowset entries per allocation chunk.
*/
#define ROWSET_ENTRY_PER_CHUNK  63

/*
** Each entry in a RowSet is an instance of the following
** structure:
*/
struct RowSetEntry {            
  i64 v;                        /* ROWID value for this entry */
  struct RowSetEntry *pNext;    /* Next entry on a list of all entries */
};

/*
** Index entries are allocated in large chunks (instances of the
** following structure) to reduce memory allocation overhead.  The
** chunks are kept on a linked list so that they can be deallocated
** when the RowSet is destroyed.
*/
struct RowSetChunk {
  struct RowSetChunk *pNext;             /* Next chunk on list of them all */
  struct RowSetEntry aEntry[ROWSET_ENTRY_PER_CHUNK]; /* Allocated entries */
};

/*
** A RowSet in an instance of the following structure.
**
** A typedef of this structure if found in sqliteInt.h.
*/
struct RowSet {
  struct RowSetChunk *pChunk;    /* List of all chunk allocations */
  sqlite3 *db;                   /* The database connection */
  struct RowSetEntry *pEntry;    /* List of entries in the rowset */
  struct RowSetEntry *pLast;     /* Last entry on the pEntry list */
  struct RowSetEntry *pFresh;    /* Source of new entry objects */
  u16 nFresh;                    /* Number of objects on pFresh */
  u8 isSorted;                   /* True if content is sorted */
};

/*
** Turn bulk memory into a RowSet object.  N bytes of memory
** are available at pSpace.  The db pointer is used as a memory context
** for any subsequent allocations that need to occur.
** Return a pointer to the new RowSet object.
**
** If N is not sufficient memory to make even a minimum RowSet,
** then return NULL.  If N is larger than the minimum, use
** the surplus as an initial allocation of entries available to
** be filled.
*/
RowSet *sqlite3RowSetInit(sqlite3 *db, void *pSpace, unsigned int N){
  RowSet *p;
  if( N<sizeof(*p) ){
    p = 0;
  }else{
    p = pSpace;
    p->pChunk = 0;
    p->db = db;
    p->pEntry = 0;
    p->pLast = 0;
    p->pFresh = (struct RowSetEntry*)&p[1];
    p->nFresh = (u16)((N - sizeof(*p))/sizeof(struct RowSetEntry));
    p->isSorted = 1;
  }
  return p;
}

/*
** Deallocate all chunks from a RowSet.
*/
void sqlite3RowSetClear(RowSet *p){
  struct RowSetChunk *pChunk, *pNextChunk;
  for(pChunk=p->pChunk; pChunk; pChunk = pNextChunk){
    pNextChunk = pChunk->pNext;
    sqlite3DbFree(p->db, pChunk);
  }
  p->pChunk = 0;
  p->nFresh = 0;
  p->pEntry = 0;
  p->pLast = 0;
  p->isSorted = 1;
}

/*
** Insert a new value into a RowSet.
**
** The mallocFailed flag of the database connection is set if a
** memory allocation fails.
*/
void sqlite3RowSetInsert(RowSet *p, i64 rowid){
  struct RowSetEntry *pEntry;
  struct RowSetEntry *pLast;
  if( p==0 ) return;  /* Must have been a malloc failure */
  if( p->nFresh==0 ){
    struct RowSetChunk *pNew;
    pNew = sqlite3DbMallocRaw(p->db, sizeof(*pNew));
    if( pNew==0 ){
      return;
    }
    pNew->pNext = p->pChunk;
    p->pChunk = pNew;
    p->pFresh = pNew->aEntry;
    p->nFresh = ROWSET_ENTRY_PER_CHUNK;
  }
  pEntry = p->pFresh++;
  p->nFresh--;
  pEntry->v = rowid;
  pEntry->pNext = 0;
  pLast = p->pLast;
  if( pLast ){
    if( p->isSorted && rowid<=pLast->v ){
      p->isSorted = 0;
    }
    pLast->pNext = pEntry;
  }else{
    assert( p->pEntry==0 );
    p->pEntry = pEntry;
  }
  p->pLast = pEntry;
}

/*
** Merge two lists of RowSet entries.  Remove duplicates.
**
** The input lists are assumed to be in sorted order.
*/
static struct RowSetEntry *boolidxMerge(
  struct RowSetEntry *pA,    /* First sorted list to be merged */
  struct RowSetEntry *pB     /* Second sorted list to be merged */
){
  struct RowSetEntry head;
  struct RowSetEntry *pTail;

  pTail = &head;
  while( pA && pB ){
    assert( pA->pNext==0 || pA->v<=pA->pNext->v );
    assert( pB->pNext==0 || pB->v<=pB->pNext->v );
    if( pA->v<pB->v ){
      pTail->pNext = pA;
      pA = pA->pNext;
      pTail = pTail->pNext;
    }else if( pB->v<pA->v ){
      pTail->pNext = pB;
      pB = pB->pNext;
      pTail = pTail->pNext;
    }else{
      pA = pA->pNext;
    }
  }
  if( pA ){
    assert( pA->pNext==0 || pA->v<=pA->pNext->v );
    pTail->pNext = pA;
  }else{
    assert( pB==0 || pB->pNext==0 || pB->v<=pB->pNext->v );
    pTail->pNext = pB;
  }
  return head.pNext;
}

/*
** Sort all elements of the RowSet into ascending order.
*/ 
static void sqlite3RowSetSort(RowSet *p){
  unsigned int i;
  struct RowSetEntry *pEntry;
  struct RowSetEntry *aBucket[40];

  assert( p->isSorted==0 );
  memset(aBucket, 0, sizeof(aBucket));
  while( p->pEntry ){
    pEntry = p->pEntry;
    p->pEntry = pEntry->pNext;
    pEntry->pNext = 0;
    for(i=0; aBucket[i]; i++){
      pEntry = boolidxMerge(aBucket[i],pEntry);
      aBucket[i] = 0;
    }
    aBucket[i] = pEntry;
  }
  pEntry = 0;
  for(i=0; i<sizeof(aBucket)/sizeof(aBucket[0]); i++){
    pEntry = boolidxMerge(pEntry,aBucket[i]);
  }
  p->pEntry = pEntry;
  p->pLast = 0;
  p->isSorted = 1;
}

/*
** Extract the next (smallest) element from the RowSet.
** Write the element into *pRowid.  Return 1 on success.  Return
** 0 if the RowSet is already empty.
*/
int sqlite3RowSetNext(RowSet *p, i64 *pRowid){
  if( !p->isSorted ){
    sqlite3RowSetSort(p);
  }
  if( p->pEntry ){
    *pRowid = p->pEntry->v;
    p->pEntry = p->pEntry->pNext;
    if( p->pEntry==0 ){
      sqlite3RowSetClear(p);
    }
    return 1;
  }else{
    return 0;
  }
}

**    May you do good and not evil.
**    May you find forgiveness for yourself and forgive others.
**    May you share freely, never taking more than you give.
**
*************************************************************************
** Internal interface definitions for SQLite.
**
** @(#) $Id: sqliteInt.h,v 1.799 2008/11/24 20:01:33 shane Exp $
*/
#ifndef _SQLITEINT_H_
#define _SQLITEINT_H_

/*
** Include the configuration header output by 'configure' if we're using the
** autoconf-based build
................................................................................

/*
** Forward references to structures
*/
typedef struct AggInfo AggInfo;
typedef struct AuthContext AuthContext;
typedef struct Bitvec Bitvec;

typedef struct CollSeq CollSeq;
typedef struct Column Column;
typedef struct Db Db;
typedef struct Schema Schema;
typedef struct Expr Expr;
typedef struct ExprList ExprList;
typedef struct FKey FKey;
................................................................................

Bitvec *sqlite3BitvecCreate(u32);
int sqlite3BitvecTest(Bitvec*, u32);
int sqlite3BitvecSet(Bitvec*, u32);
void sqlite3BitvecClear(Bitvec*, u32);
void sqlite3BitvecDestroy(Bitvec*);
int sqlite3BitvecBuiltinTest(int,int*);






void sqlite3CreateView(Parse*,Token*,Token*,Token*,Select*,int,int);

#if !defined(SQLITE_OMIT_VIEW) || !defined(SQLITE_OMIT_VIRTUALTABLE)
  int sqlite3ViewGetColumnNames(Parse*,Table*);
#else
# define sqlite3ViewGetColumnNames(A,B) 0

**    May you do good and not evil.
**    May you find forgiveness for yourself and forgive others.
**    May you share freely, never taking more than you give.
**
*************************************************************************
** Internal interface definitions for SQLite.
**
** @(#) $Id: sqliteInt.h,v 1.800 2008/12/04 20:40:10 drh Exp $
*/
#ifndef _SQLITEINT_H_
#define _SQLITEINT_H_

/*
** Include the configuration header output by 'configure' if we're using the
** autoconf-based build
................................................................................

/*
** Forward references to structures
*/
typedef struct AggInfo AggInfo;
typedef struct AuthContext AuthContext;
typedef struct Bitvec Bitvec;
typedef struct RowSet RowSet;
typedef struct CollSeq CollSeq;
typedef struct Column Column;
typedef struct Db Db;
typedef struct Schema Schema;
typedef struct Expr Expr;
typedef struct ExprList ExprList;
typedef struct FKey FKey;
................................................................................

Bitvec *sqlite3BitvecCreate(u32);
int sqlite3BitvecTest(Bitvec*, u32);
int sqlite3BitvecSet(Bitvec*, u32);
void sqlite3BitvecClear(Bitvec*, u32);
void sqlite3BitvecDestroy(Bitvec*);
int sqlite3BitvecBuiltinTest(int,int*);

RowSet *sqlite3RowSetInit(sqlite3*, void*, unsigned int);
void sqlite3RowSetClear(RowSet*);
void sqlite3RowSetInsert(RowSet*, i64);
int sqlite3RowSetNext(RowSet*, i64*);

void sqlite3CreateView(Parse*,Token*,Token*,Token*,Select*,int,int);

#if !defined(SQLITE_OMIT_VIEW) || !defined(SQLITE_OMIT_VIRTUALTABLE)
  int sqlite3ViewGetColumnNames(Parse*,Table*);
#else
# define sqlite3ViewGetColumnNames(A,B) 0

**    May you find forgiveness for yourself and forgive others.
**    May you share freely, never taking more than you give.
**
*************************************************************************
** This file contains C code routines that are called by the parser
** to handle UPDATE statements.
**
** $Id: update.c,v 1.187 2008/11/19 09:05:27 danielk1977 Exp $
*/
#include "sqliteInt.h"

#ifndef SQLITE_OMIT_VIRTUALTABLE
/* Forward declaration */
static void updateVirtualTable(
  Parse *pParse,       /* The parsing context */
................................................................................
  int oldIdx      = -1;  /* index of trigger "old" temp table       */

  /* Register Allocations */
  int regRowCount = 0;   /* A count of rows changed */
  int regOldRowid;       /* The old rowid */
  int regNewRowid;       /* The new rowid */
  int regData;           /* New data for the row */


  sContext.pParse = 0;
  db = pParse->db;
  if( pParse->nErr || db->mallocFailed ){
    goto update_cleanup;
  }
  assert( pTabList->nSrc==1 );
................................................................................
                             WHERE_ONEPASS_DESIRED);
  if( pWInfo==0 ) goto update_cleanup;
  okOnePass = pWInfo->okOnePass;

  /* Remember the rowid of every item to be updated.
  */
  sqlite3VdbeAddOp2(v, IsVirtual(pTab)?OP_VRowid:OP_Rowid, iCur, regOldRowid);
  if( !okOnePass ) sqlite3VdbeAddOp2(v, OP_FifoWrite, regOldRowid, 0);




  /* End the database scan loop.
  */
  sqlite3WhereEnd(pWInfo);

  /* Initialize the count of updated rows
  */
................................................................................

  /* Top of the update loop */
  if( okOnePass ){
    int a1 = sqlite3VdbeAddOp1(v, OP_NotNull, regOldRowid);
    addr = sqlite3VdbeAddOp0(v, OP_Goto);
    sqlite3VdbeJumpHere(v, a1);
  }else{
    addr = sqlite3VdbeAddOp2(v, OP_FifoRead, regOldRowid, 0);
  }

  if( triggers_exist ){
    int regRowid;
    int regRow;
    int regCols;

**    May you find forgiveness for yourself and forgive others.
**    May you share freely, never taking more than you give.
**
*************************************************************************
** This file contains C code routines that are called by the parser
** to handle UPDATE statements.
**
** $Id: update.c,v 1.188 2008/12/04 20:40:10 drh Exp $
*/
#include "sqliteInt.h"

#ifndef SQLITE_OMIT_VIRTUALTABLE
/* Forward declaration */
static void updateVirtualTable(
  Parse *pParse,       /* The parsing context */
................................................................................
  int oldIdx      = -1;  /* index of trigger "old" temp table       */

  /* Register Allocations */
  int regRowCount = 0;   /* A count of rows changed */
  int regOldRowid;       /* The old rowid */
  int regNewRowid;       /* The new rowid */
  int regData;           /* New data for the row */
  int regRowSet;         /* Rowset of rows to be updated */

  sContext.pParse = 0;
  db = pParse->db;
  if( pParse->nErr || db->mallocFailed ){
    goto update_cleanup;
  }
  assert( pTabList->nSrc==1 );
................................................................................
                             WHERE_ONEPASS_DESIRED);
  if( pWInfo==0 ) goto update_cleanup;
  okOnePass = pWInfo->okOnePass;

  /* Remember the rowid of every item to be updated.
  */
  sqlite3VdbeAddOp2(v, IsVirtual(pTab)?OP_VRowid:OP_Rowid, iCur, regOldRowid);
  if( !okOnePass ){
    regRowSet = ++pParse->nMem;
    sqlite3VdbeAddOp2(v, OP_RowSetAdd, regRowSet, regOldRowid);
  }

  /* End the database scan loop.
  */
  sqlite3WhereEnd(pWInfo);

  /* Initialize the count of updated rows
  */
................................................................................

  /* Top of the update loop */
  if( okOnePass ){
    int a1 = sqlite3VdbeAddOp1(v, OP_NotNull, regOldRowid);
    addr = sqlite3VdbeAddOp0(v, OP_Goto);
    sqlite3VdbeJumpHere(v, a1);
  }else{
    addr = sqlite3VdbeAddOp3(v, OP_RowSetRead, regRowSet, 0, regOldRowid);
  }

  if( triggers_exist ){
    int regRowid;
    int regRow;
    int regCols;

**
** Various scripts scan this source file in order to generate HTML
** documentation, headers files, or other derived files.  The formatting
** of the code in this file is, therefore, important.  See other comments
** in this file for details.  If in doubt, do not deviate from existing
** commenting and indentation practices when changing or adding code.
**
** $Id: vdbe.c,v 1.789 2008/12/04 12:17:30 drh Exp $
*/
#include "sqliteInt.h"
#include <ctype.h>
#include "vdbeInt.h"

/*
** The following global variable is incremented every time a cursor
................................................................................
** Allocate VdbeCursor number iCur.  Return a pointer to it.  Return NULL
** if we run out of memory.
*/
static VdbeCursor *allocateCursor(
  Vdbe *p,              /* The virtual machine */
  int iCur,             /* Index of the new VdbeCursor */
  Op *pOp,              /* */
  int iDb,              /* */
  int isBtreeCursor     /* */
){
  /* Find the memory cell that will be used to store the blob of memory
  ** required for this VdbeCursor structure. It is convenient to use a 
  ** vdbe memory cell to manage the memory allocation required for a
  ** VdbeCursor structure for the following reasons:
  **
................................................................................
  pc = pcDest;
  break;
}


/* Opcode:  Halt P1 P2 * P4 *
**
** Exit immediately.  All open cursors, Fifos, etc are closed
** automatically.
**
** P1 is the result code returned by sqlite3_exec(), sqlite3_reset(),
** or sqlite3_finalize().  For a normal halt, this should be SQLITE_OK (0).
** For errors, it can be some other value.  If P1!=0 then P2 will determine
** whether or not to rollback the current transaction.  Do not rollback
** if P2==OE_Fail. Do the rollback if P2==OE_Rollback.  If P2==OE_Abort,
................................................................................
  }
  UPDATE_MAX_BLOBSIZE(pIn1);
  sqlite3VdbeChangeEncoding(pIn1, encoding);
  break;
}
#endif /* SQLITE_OMIT_INTEGRITY_CHECK */

/* Opcode: FifoWrite P1 * * * *
**
** Write the integer from register P1 into the Fifo.



*/
case OP_FifoWrite: {        /* in1 */
  p->sFifo.db = db;
  if( sqlite3VdbeFifoPush(&p->sFifo, sqlite3VdbeIntValue(pIn1))==SQLITE_NOMEM ){
    goto no_mem;









  }

  break;
}

/* Opcode: FifoRead P1 P2 * * *

**
** Attempt to read a single integer from the Fifo.  Store that
** integer in register P1.
** 
** If the Fifo is empty jump to P2.



*/
case OP_FifoRead: {         /* jump */
  CHECK_FOR_INTERRUPT;



  assert( pOp->p1>0 && pOp->p1<=p->nMem );

  pOut = &p->aMem[pOp->p1];
  MemSetTypeFlag(pOut, MEM_Int);
  if( sqlite3VdbeFifoPop(&p->sFifo, &pOut->u.i)==SQLITE_DONE ){





    pc = pOp->p2 - 1;





  }
  break;
}


#ifndef SQLITE_OMIT_TRIGGER
/* Opcode: ContextPush * * * 
**
** Save the current Vdbe context such that it can be restored by a ContextPop
** opcode. The context stores the last insert row id, the last statement change
** count, and the current statement change count.
................................................................................
    p->contextStack = sqlite3DbReallocOrFree(db, p->contextStack,
                                          sizeof(Context)*(i+1));
    if( p->contextStack==0 ) goto no_mem;
  }
  pContext = &p->contextStack[i];
  pContext->lastRowid = db->lastRowid;
  pContext->nChange = p->nChange;
  pContext->sFifo = p->sFifo;
  sqlite3VdbeFifoInit(&p->sFifo, db);
  break;
}

/* Opcode: ContextPop * * * 
**
** Restore the Vdbe context to the state it was in when contextPush was last
** executed. The context stores the last insert row id, the last statement
................................................................................
** change count, and the current statement change count.
*/
case OP_ContextPop: {
  Context *pContext = &p->contextStack[--p->contextStackTop];
  assert( p->contextStackTop>=0 );
  db->lastRowid = pContext->lastRowid;
  p->nChange = pContext->nChange;
  sqlite3VdbeFifoClear(&p->sFifo);
  p->sFifo = pContext->sFifo;
  break;
}
#endif /* #ifndef SQLITE_OMIT_TRIGGER */

#ifndef SQLITE_OMIT_AUTOINCREMENT
/* Opcode: MemMax P1 P2 * * *
**

**
** Various scripts scan this source file in order to generate HTML
** documentation, headers files, or other derived files.  The formatting
** of the code in this file is, therefore, important.  See other comments
** in this file for details.  If in doubt, do not deviate from existing
** commenting and indentation practices when changing or adding code.
**
** $Id: vdbe.c,v 1.790 2008/12/04 20:40:10 drh Exp $
*/
#include "sqliteInt.h"
#include <ctype.h>
#include "vdbeInt.h"

/*
** The following global variable is incremented every time a cursor
................................................................................
** Allocate VdbeCursor number iCur.  Return a pointer to it.  Return NULL
** if we run out of memory.
*/
static VdbeCursor *allocateCursor(
  Vdbe *p,              /* The virtual machine */
  int iCur,             /* Index of the new VdbeCursor */
  Op *pOp,              /* */
  int iDb,              /* When database the cursor belongs to, or -1 */
  int isBtreeCursor     /* */
){
  /* Find the memory cell that will be used to store the blob of memory
  ** required for this VdbeCursor structure. It is convenient to use a 
  ** vdbe memory cell to manage the memory allocation required for a
  ** VdbeCursor structure for the following reasons:
  **
................................................................................
  pc = pcDest;
  break;
}


/* Opcode:  Halt P1 P2 * P4 *
**
** Exit immediately.  All open cursors, etc are closed
** automatically.
**
** P1 is the result code returned by sqlite3_exec(), sqlite3_reset(),
** or sqlite3_finalize().  For a normal halt, this should be SQLITE_OK (0).
** For errors, it can be some other value.  If P1!=0 then P2 will determine
** whether or not to rollback the current transaction.  Do not rollback
** if P2==OE_Fail. Do the rollback if P2==OE_Rollback.  If P2==OE_Abort,
................................................................................
  }
  UPDATE_MAX_BLOBSIZE(pIn1);
  sqlite3VdbeChangeEncoding(pIn1, encoding);
  break;
}
#endif /* SQLITE_OMIT_INTEGRITY_CHECK */

/* Opcode: RowSetAdd P1 P2 * * *
**
** Insert the integer value held by register P2 into a boolean index
** held in register P1.
**
** An assertion fails if P2 is not an integer.
*/



case OP_RowSetAdd: {       /* in2 */
  Mem *pIdx;
  Mem *pVal;
  assert( pOp->p1>0 && pOp->p1<=p->nMem );
  pIdx = &p->aMem[pOp->p1];
  assert( pOp->p2>0 && pOp->p2<=p->nMem );
  pVal = &p->aMem[pOp->p2];
  assert( (pVal->flags & MEM_Int)!=0 );
  if( (pIdx->flags & MEM_RowSet)==0 ){
    sqlite3VdbeMemSetRowSet(pIdx);
  }
  sqlite3RowSetInsert(pIdx->u.pRowSet, pVal->u.i);
  break;
}


/* Opcode: RowSetRead P1 P2 P3 * *
**




** Extract the smallest value from boolean index P1 and put that value into
** register P3.  Or, if boolean index P1 is initially empty, leave P3
** unchanged and jump to instruction P2.
*/


case OP_RowSetRead: {       /* jump, out3 */
  Mem *pIdx;
  i64 val;
  assert( pOp->p1>0 && pOp->p1<=p->nMem );
  CHECK_FOR_INTERRUPT;
  pIdx = &p->aMem[pOp->p1];


  if( (pIdx->flags & MEM_RowSet)==0 
   || sqlite3RowSetNext(pIdx->u.pRowSet, &val)==0
  ){
    /* The boolean index is empty */
    sqlite3VdbeMemSetNull(pIdx);
    pc = pOp->p2 - 1;
  }else{
    /* A value was pulled from the index */
    assert( pOp->p3>0 && pOp->p3<=p->nMem );
    pOut = &p->aMem[pOp->p3];
    sqlite3VdbeMemSetInt64(pOut, val);
  }
  break;
}


#ifndef SQLITE_OMIT_TRIGGER
/* Opcode: ContextPush * * * 
**
** Save the current Vdbe context such that it can be restored by a ContextPop
** opcode. The context stores the last insert row id, the last statement change
** count, and the current statement change count.
................................................................................
    p->contextStack = sqlite3DbReallocOrFree(db, p->contextStack,
                                          sizeof(Context)*(i+1));
    if( p->contextStack==0 ) goto no_mem;
  }
  pContext = &p->contextStack[i];
  pContext->lastRowid = db->lastRowid;
  pContext->nChange = p->nChange;


  break;
}

/* Opcode: ContextPop * * * 
**
** Restore the Vdbe context to the state it was in when contextPush was last
** executed. The context stores the last insert row id, the last statement
................................................................................
** change count, and the current statement change count.
*/
case OP_ContextPop: {
  Context *pContext = &p->contextStack[--p->contextStackTop];
  assert( p->contextStackTop>=0 );
  db->lastRowid = pContext->lastRowid;
  p->nChange = pContext->nChange;


  break;
}
#endif /* #ifndef SQLITE_OMIT_TRIGGER */

#ifndef SQLITE_OMIT_AUTOINCREMENT
/* Opcode: MemMax P1 P2 * * *
**

*************************************************************************
** This is the header file for information that is private to the
** VDBE.  This information used to all be at the top of the single
** source code file "vdbe.c".  When that file became too big (over
** 6000 lines long) it was split up into several smaller files and
** this header information was factored out.
**
** $Id: vdbeInt.h,v 1.158 2008/11/17 15:31:48 danielk1977 Exp $
*/
#ifndef _VDBEINT_H_
#define _VDBEINT_H_

/*
** intToKey() and keyToInt() used to transform the rowid.  But with
** the latest versions of the design they are no-ops.
................................................................................
** Each value has a manifest type. The manifest type of the value stored
** in a Mem struct is returned by the MemType(Mem*) macro. The type is
** one of SQLITE_NULL, SQLITE_INTEGER, SQLITE_REAL, SQLITE_TEXT or
** SQLITE_BLOB.
*/
struct Mem {
  union {
    i64 i;              /* Integer value. Or FuncDef* when flags==MEM_Agg */
    FuncDef *pDef;      /* Used only when flags==MEM_Agg */

  } u;
  double r;           /* Real value */
  sqlite3 *db;        /* The associated database connection */
  char *z;            /* String or BLOB value */
  int n;              /* Number of characters in string value, excluding '\0' */
  u16 flags;          /* Some combination of MEM_Null, MEM_Str, MEM_Dyn, etc. */
  u8  type;           /* One of SQLITE_NULL, SQLITE_TEXT, SQLITE_INTEGER, etc */
................................................................................
** at a time can appear in Mem.type.
*/
#define MEM_Null      0x0001   /* Value is NULL */
#define MEM_Str       0x0002   /* Value is a string */
#define MEM_Int       0x0004   /* Value is an integer */
#define MEM_Real      0x0008   /* Value is a real number */
#define MEM_Blob      0x0010   /* Value is a BLOB */


#define MemSetTypeFlag(p, f) \
  ((p)->flags = ((p)->flags&~(MEM_Int|MEM_Real|MEM_Null|MEM_Blob|MEM_Str))|f)

/* Whenever Mem contains a valid string or blob representation, one of
** the following flags must be set to determine the memory management
** policy for Mem.z.  The MEM_Term flag tells us whether or not the
** string is \000 or \u0000 terminated
*/
#define MEM_Term      0x0020   /* String rep is nul terminated */
#define MEM_Dyn       0x0040   /* Need to call sqliteFree() on Mem.z */
#define MEM_Static    0x0080   /* Mem.z points to a static string */
#define MEM_Ephem     0x0100   /* Mem.z points to an ephemeral string */
#define MEM_Agg       0x0400   /* Mem.z points to an agg function context */
#define MEM_Zero      0x0800   /* Mem.i contains count of 0s appended to blob */

#ifdef SQLITE_OMIT_INCRBLOB
  #undef MEM_Zero
  #define MEM_Zero 0x0000
#endif








/* A VdbeFunc is just a FuncDef (defined in sqliteInt.h) that contains
** additional information about auxiliary information bound to arguments
** of the function.  This is used to implement the sqlite3_get_auxdata()
** and sqlite3_set_auxdata() APIs.  The "auxdata" is some auxiliary data
** that can be associated with a constant argument to a function.  This
** allows functions such as "regexp" to compile their constant regular
................................................................................
*/
typedef struct Set Set;
struct Set {
  Hash hash;             /* A set is just a hash table */
  HashElem *prev;        /* Previously accessed hash elemen */
};

/*
** A FifoPage structure holds a single page of valves.  Pages are arranged
** in a list.
*/
typedef struct FifoPage FifoPage;
struct FifoPage {
  int nSlot;         /* Number of entries aSlot[] */
  int iWrite;        /* Push the next value into this entry in aSlot[] */
  int iRead;         /* Read the next value from this entry in aSlot[] */
  FifoPage *pNext;   /* Next page in the fifo */
  i64 aSlot[1];      /* One or more slots for rowid values */
};

/*
** The Fifo structure is typedef-ed in vdbeInt.h.  But the implementation
** of that structure is private to this file.
**
** The Fifo structure describes the entire fifo.  
*/
typedef struct Fifo Fifo;
struct Fifo {
  int nEntry;         /* Total number of entries */
  sqlite3 *db;        /* The associated database connection */
  FifoPage *pFirst;   /* First page on the list */
  FifoPage *pLast;    /* Last page on the list */
};

/*
** A Context stores the last insert rowid, the last statement change count,
** and the current statement change count (i.e. changes since last statement).
** The current keylist is also stored in the context.
** Elements of Context structure type make up the ContextStack, which is
** updated by the ContextPush and ContextPop opcodes (used by triggers).
** The context is pushed before executing a trigger a popped when the
** trigger finishes.
*/
typedef struct Context Context;
struct Context {
  i64 lastRowid;    /* Last insert rowid (sqlite3.lastRowid) */
  int nChange;      /* Statement changes (Vdbe.nChanges)     */
  Fifo sFifo;       /* Records that will participate in a DELETE or UPDATE */
};

/*
** 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()
................................................................................
  char **azVar;       /* Name of variables */
  int okVar;          /* True if azVar[] has been initialized */
  u32 magic;              /* Magic number for sanity checking */
  int nMem;               /* Number of memory locations currently allocated */
  Mem *aMem;              /* The memory locations */
  int nCallback;          /* Number of callbacks invoked so far */
  int cacheCtr;           /* VdbeCursor row cache generation counter */
  Fifo sFifo;             /* A list of ROWIDs */
  int contextStackTop;    /* Index of top element in the context stack */
  int contextStackDepth;  /* The size of the "context" stack */
  Context *contextStack;  /* Stack used by opcodes ContextPush & ContextPop*/
  int pc;                 /* The program counter */
  int rc;                 /* Value to return */
  unsigned uniqueCnt;     /* Used by OP_MakeRecord when P2!=0 */
  int errorAction;        /* Recovery action to do in case of an error */
................................................................................
void sqlite3VdbeMemMove(Mem*, Mem*);
int sqlite3VdbeMemNulTerminate(Mem*);
int sqlite3VdbeMemSetStr(Mem*, const char*, int, u8, void(*)(void*));
void sqlite3VdbeMemSetInt64(Mem*, i64);
void sqlite3VdbeMemSetDouble(Mem*, double);
void sqlite3VdbeMemSetNull(Mem*);
void sqlite3VdbeMemSetZeroBlob(Mem*,int);

int sqlite3VdbeMemMakeWriteable(Mem*);
int sqlite3VdbeMemStringify(Mem*, int);
i64 sqlite3VdbeIntValue(Mem*);
int sqlite3VdbeMemIntegerify(Mem*);
double sqlite3VdbeRealValue(Mem*);
void sqlite3VdbeIntegerAffinity(Mem*);
int sqlite3VdbeMemRealify(Mem*);
................................................................................
#endif
int sqlite3VdbeMemTranslate(Mem*, u8);
#ifdef SQLITE_DEBUG
  void sqlite3VdbePrintSql(Vdbe*);
  void sqlite3VdbeMemPrettyPrint(Mem *pMem, char *zBuf);
#endif
int sqlite3VdbeMemHandleBom(Mem *pMem);
void sqlite3VdbeFifoInit(Fifo*, sqlite3*);
int sqlite3VdbeFifoPush(Fifo*, i64);
int sqlite3VdbeFifoPop(Fifo*, i64*);
void sqlite3VdbeFifoClear(Fifo*);

#ifndef SQLITE_OMIT_INCRBLOB
  int sqlite3VdbeMemExpandBlob(Mem *);
#else
  #define sqlite3VdbeMemExpandBlob(x) SQLITE_OK
#endif

#endif /* !defined(_VDBEINT_H_) */

*************************************************************************
** This is the header file for information that is private to the
** VDBE.  This information used to all be at the top of the single
** source code file "vdbe.c".  When that file became too big (over
** 6000 lines long) it was split up into several smaller files and
** this header information was factored out.
**
** $Id: vdbeInt.h,v 1.159 2008/12/04 20:40:10 drh Exp $
*/
#ifndef _VDBEINT_H_
#define _VDBEINT_H_

/*
** intToKey() and keyToInt() used to transform the rowid.  But with
** the latest versions of the design they are no-ops.
................................................................................
** Each value has a manifest type. The manifest type of the value stored
** in a Mem struct is returned by the MemType(Mem*) macro. The type is
** one of SQLITE_NULL, SQLITE_INTEGER, SQLITE_REAL, SQLITE_TEXT or
** SQLITE_BLOB.
*/
struct Mem {
  union {
    i64 i;              /* Integer value. */
    FuncDef *pDef;      /* Used only when flags==MEM_Agg */
    RowSet *pRowSet;    /* Used only when flags==MEM_RowSet */
  } u;
  double r;           /* Real value */
  sqlite3 *db;        /* The associated database connection */
  char *z;            /* String or BLOB value */
  int n;              /* Number of characters in string value, excluding '\0' */
  u16 flags;          /* Some combination of MEM_Null, MEM_Str, MEM_Dyn, etc. */
  u8  type;           /* One of SQLITE_NULL, SQLITE_TEXT, SQLITE_INTEGER, etc */
................................................................................
** at a time can appear in Mem.type.
*/
#define MEM_Null      0x0001   /* Value is NULL */
#define MEM_Str       0x0002   /* Value is a string */
#define MEM_Int       0x0004   /* Value is an integer */
#define MEM_Real      0x0008   /* Value is a real number */
#define MEM_Blob      0x0010   /* Value is a BLOB */

#define MEM_RowSet    0x0020   /* Value is a RowSet object */
#define MEM_TypeMask  0x00ff   /* Mask of type bits */


/* Whenever Mem contains a valid string or blob representation, one of
** the following flags must be set to determine the memory management
** policy for Mem.z.  The MEM_Term flag tells us whether or not the
** string is \000 or \u0000 terminated
*/
#define MEM_Term      0x0200   /* String rep is nul terminated */
#define MEM_Dyn       0x0400   /* Need to call sqliteFree() on Mem.z */
#define MEM_Static    0x0800   /* Mem.z points to a static string */
#define MEM_Ephem     0x1000   /* Mem.z points to an ephemeral string */
#define MEM_Agg       0x2000   /* Mem.z points to an agg function context */
#define MEM_Zero      0x4000   /* Mem.i contains count of 0s appended to blob */

#ifdef SQLITE_OMIT_INCRBLOB
  #undef MEM_Zero
  #define MEM_Zero 0x0000
#endif


/*
** Clear any existing type flags from a Mem and replace them with f
*/
#define MemSetTypeFlag(p, f) ((p)->flags = ((p)->flags&~(MEM_TypeMask))|f)


/* A VdbeFunc is just a FuncDef (defined in sqliteInt.h) that contains
** additional information about auxiliary information bound to arguments
** of the function.  This is used to implement the sqlite3_get_auxdata()
** and sqlite3_set_auxdata() APIs.  The "auxdata" is some auxiliary data
** that can be associated with a constant argument to a function.  This
** allows functions such as "regexp" to compile their constant regular
................................................................................
*/
typedef struct Set Set;
struct Set {
  Hash hash;             /* A set is just a hash table */
  HashElem *prev;        /* Previously accessed hash elemen */
};




























/*
** A Context stores the last insert rowid, the last statement change count,
** and the current statement change count (i.e. changes since last statement).
** The current keylist is also stored in the context.
** Elements of Context structure type make up the ContextStack, which is
** updated by the ContextPush and ContextPop opcodes (used by triggers).
** The context is pushed before executing a trigger a popped when the
** trigger finishes.
*/
typedef struct Context Context;
struct Context {
  i64 lastRowid;    /* Last insert rowid (sqlite3.lastRowid) */
  int nChange;      /* Statement changes (Vdbe.nChanges)     */

};

/*
** 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()
................................................................................
  char **azVar;       /* Name of variables */
  int okVar;          /* True if azVar[] has been initialized */
  u32 magic;              /* Magic number for sanity checking */
  int nMem;               /* Number of memory locations currently allocated */
  Mem *aMem;              /* The memory locations */
  int nCallback;          /* Number of callbacks invoked so far */
  int cacheCtr;           /* VdbeCursor row cache generation counter */

  int contextStackTop;    /* Index of top element in the context stack */
  int contextStackDepth;  /* The size of the "context" stack */
  Context *contextStack;  /* Stack used by opcodes ContextPush & ContextPop*/
  int pc;                 /* The program counter */
  int rc;                 /* Value to return */
  unsigned uniqueCnt;     /* Used by OP_MakeRecord when P2!=0 */
  int errorAction;        /* Recovery action to do in case of an error */
................................................................................
void sqlite3VdbeMemMove(Mem*, Mem*);
int sqlite3VdbeMemNulTerminate(Mem*);
int sqlite3VdbeMemSetStr(Mem*, const char*, int, u8, void(*)(void*));
void sqlite3VdbeMemSetInt64(Mem*, i64);
void sqlite3VdbeMemSetDouble(Mem*, double);
void sqlite3VdbeMemSetNull(Mem*);
void sqlite3VdbeMemSetZeroBlob(Mem*,int);
void sqlite3VdbeMemSetRowSet(Mem*);
int sqlite3VdbeMemMakeWriteable(Mem*);
int sqlite3VdbeMemStringify(Mem*, int);
i64 sqlite3VdbeIntValue(Mem*);
int sqlite3VdbeMemIntegerify(Mem*);
double sqlite3VdbeRealValue(Mem*);
void sqlite3VdbeIntegerAffinity(Mem*);
int sqlite3VdbeMemRealify(Mem*);
................................................................................
#endif
int sqlite3VdbeMemTranslate(Mem*, u8);
#ifdef SQLITE_DEBUG
  void sqlite3VdbePrintSql(Vdbe*);
  void sqlite3VdbeMemPrettyPrint(Mem *pMem, char *zBuf);
#endif
int sqlite3VdbeMemHandleBom(Mem *pMem);





#ifndef SQLITE_OMIT_INCRBLOB
  int sqlite3VdbeMemExpandBlob(Mem *);
#else
  #define sqlite3VdbeMemExpandBlob(x) SQLITE_OK
#endif

#endif /* !defined(_VDBEINT_H_) */

**
*************************************************************************
** This file contains code used for creating, destroying, and populating
** a VDBE (or an "sqlite3_stmt" as it is known to the outside world.)  Prior
** to version 2.8.7, all this code was combined into the vdbe.c source file.
** But that file was getting too big so this subroutines were split out.
**
** $Id: vdbeaux.c,v 1.421 2008/11/21 16:58:03 danielk1977 Exp $
*/
#include "sqliteInt.h"
#include <ctype.h>
#include "vdbeInt.h"



................................................................................
#ifdef SQLITE_ENABLE_MEMORY_MANAGEMENT
int sqlite3VdbeReleaseBuffers(Vdbe *p){
  int ii;
  int nFree = 0;
  assert( sqlite3_mutex_held(p->db->mutex) );
  for(ii=1; ii<=p->nMem; ii++){
    Mem *pMem = &p->aMem[ii];



    if( pMem->z && pMem->flags&MEM_Dyn ){
      assert( !pMem->xDel );
      nFree += sqlite3DbMallocSize(pMem->db, pMem->z);
      sqlite3VdbeMemRelease(pMem);
    }
  }
  return nFree;
................................................................................
** This routine will automatically close any cursors, lists, and/or
** sorters that were left open.  It also deletes the values of
** variables in the aVar[] array.
*/
static void Cleanup(Vdbe *p){
  int i;
  sqlite3 *db = p->db;
  closeAllCursorsExceptActiveVtabs(p);
  for(i=1; i<=p->nMem; i++){
    MemSetTypeFlag(&p->aMem[i], MEM_Null);
  }
  releaseMemArray(&p->aMem[1], p->nMem);
  sqlite3VdbeFifoClear(&p->sFifo);
  if( p->contextStack ){
    for(i=0; i<p->contextStackTop; i++){
      sqlite3VdbeFifoClear(&p->contextStack[i].sFifo);
    }
    sqlite3DbFree(db, p->contextStack);
  }
  p->contextStack = 0;
  p->contextStackDepth = 0;
  p->contextStackTop = 0;
  sqlite3DbFree(db, p->zErrMsg);
  p->zErrMsg = 0;

**
*************************************************************************
** This file contains code used for creating, destroying, and populating
** a VDBE (or an "sqlite3_stmt" as it is known to the outside world.)  Prior
** to version 2.8.7, all this code was combined into the vdbe.c source file.
** But that file was getting too big so this subroutines were split out.
**
** $Id: vdbeaux.c,v 1.422 2008/12/04 20:40:10 drh Exp $
*/
#include "sqliteInt.h"
#include <ctype.h>
#include "vdbeInt.h"



................................................................................
#ifdef SQLITE_ENABLE_MEMORY_MANAGEMENT
int sqlite3VdbeReleaseBuffers(Vdbe *p){
  int ii;
  int nFree = 0;
  assert( sqlite3_mutex_held(p->db->mutex) );
  for(ii=1; ii<=p->nMem; ii++){
    Mem *pMem = &p->aMem[ii];
    if( pMem->flags & MEM_RowSet ){
      sqlite3RowSetClear(pMem->u.pRowSet);
    }
    if( pMem->z && pMem->flags&MEM_Dyn ){
      assert( !pMem->xDel );
      nFree += sqlite3DbMallocSize(pMem->db, pMem->z);
      sqlite3VdbeMemRelease(pMem);
    }
  }
  return nFree;
................................................................................
** This routine will automatically close any cursors, lists, and/or
** sorters that were left open.  It also deletes the values of
** variables in the aVar[] array.
*/
static void Cleanup(Vdbe *p){
  int i;
  sqlite3 *db = p->db;
  Mem *pMem;
  closeAllCursorsExceptActiveVtabs(p);
  for(pMem=&p->aMem[1], i=1; i<=p->nMem; i++, pMem++){
    if( pMem->flags & MEM_RowSet ){
      sqlite3RowSetClear(pMem->u.pRowSet);
    }
    MemSetTypeFlag(pMem, MEM_Null);
  }
  releaseMemArray(&p->aMem[1], p->nMem);
  if( p->contextStack ){
    sqlite3DbFree(db, p->contextStack);
  }
  p->contextStack = 0;
  p->contextStackDepth = 0;
  p->contextStackTop = 0;
  sqlite3DbFree(db, p->zErrMsg);
  p->zErrMsg = 0;

/*
** 2005 June 16
**
** The author disclaims copyright to this source code.  In place of
** a legal notice, here is a blessing:
**
**    May you do good and not evil.
**    May you find forgiveness for yourself and forgive others.
**    May you share freely, never taking more than you give.
**
*************************************************************************
** This file implements a FIFO queue of rowids used for processing
** UPDATE and DELETE statements.
**
** $Id: vdbefifo.c,v 1.9 2008/11/17 19:18:55 danielk1977 Exp $
*/
#include "sqliteInt.h"
#include "vdbeInt.h"

/*
** Constants FIFOSIZE_FIRST and FIFOSIZE_MAX are the initial
** number of entries in a fifo page and the maximum number of
** entries in a fifo page.
*/
#define FIFOSIZE_FIRST (((128-sizeof(FifoPage))/8)+1)
#ifdef SQLITE_MALLOC_SOFT_LIMIT
# define FIFOSIZE_MAX   (int)(((SQLITE_MALLOC_SOFT_LIMIT-sizeof(FifoPage))/8)+1)
#else
# define FIFOSIZE_MAX   (int)(((262144-sizeof(FifoPage))/8)+1)
#endif

/*
** Allocate a new FifoPage and return a pointer to it.  Return NULL if
** we run out of memory.  Leave space on the page for nEntry entries.
*/
static FifoPage *allocateFifoPage(sqlite3 *db, int nEntry){
  FifoPage *pPage;
  if( nEntry>FIFOSIZE_MAX ){
    nEntry = FIFOSIZE_MAX;
  }
  pPage = sqlite3DbMallocRaw(db, sizeof(FifoPage) + sizeof(i64)*(nEntry-1) );
  if( pPage ){
    pPage->nSlot = nEntry;
    pPage->iWrite = 0;
    pPage->iRead = 0;
    pPage->pNext = 0;
  }
  return pPage;
}

/*
** Initialize a Fifo structure.
*/
void sqlite3VdbeFifoInit(Fifo *pFifo, sqlite3 *db){
  memset(pFifo, 0, sizeof(*pFifo));
  pFifo->db = db;
}

/*
** Push a single 64-bit integer value into the Fifo.  Return SQLITE_OK
** normally.   SQLITE_NOMEM is returned if we are unable to allocate
** memory.
*/
int sqlite3VdbeFifoPush(Fifo *pFifo, i64 val){
  FifoPage *pPage;
  pPage = pFifo->pLast;
  if( pPage==0 ){
    pPage = pFifo->pLast = pFifo->pFirst =
         allocateFifoPage(pFifo->db, FIFOSIZE_FIRST);
    if( pPage==0 ){
      return SQLITE_NOMEM;
    }
  }else if( pPage->iWrite>=pPage->nSlot ){
    pPage->pNext = allocateFifoPage(pFifo->db, pFifo->nEntry);
    if( pPage->pNext==0 ){
      return SQLITE_NOMEM;
    }
    pPage = pFifo->pLast = pPage->pNext;
  }
  pPage->aSlot[pPage->iWrite++] = val;
  pFifo->nEntry++;
  return SQLITE_OK;
}

/*
** Extract a single 64-bit integer value from the Fifo.  The integer
** extracted is the one least recently inserted.  If the Fifo is empty
** return SQLITE_DONE.
*/
int sqlite3VdbeFifoPop(Fifo *pFifo, i64 *pVal){
  FifoPage *pPage;
  if( pFifo->nEntry==0 ){
    return SQLITE_DONE;
  }
  assert( pFifo->nEntry>0 );
  pPage = pFifo->pFirst;
  assert( pPage!=0 );
  assert( pPage->iWrite>pPage->iRead );
  assert( pPage->iWrite<=pPage->nSlot );
  assert( pPage->iRead<pPage->nSlot );
  assert( pPage->iRead>=0 );
  *pVal = pPage->aSlot[pPage->iRead++];
  pFifo->nEntry--;
  if( pPage->iRead>=pPage->iWrite ){
    pFifo->pFirst = pPage->pNext;
    sqlite3DbFree(pFifo->db, pPage);
    if( pFifo->nEntry==0 ){
      assert( pFifo->pLast==pPage );
      pFifo->pLast = 0;
    }else{
      assert( pFifo->pFirst!=0 );
    }
  }else{
    assert( pFifo->nEntry>0 );
  }
  return SQLITE_OK;
}

/*
** Delete all information from a Fifo object.   Free all memory held
** by the Fifo.
*/
void sqlite3VdbeFifoClear(Fifo *pFifo){
  FifoPage *pPage, *pNextPage;
  for(pPage=pFifo->pFirst; pPage; pPage=pNextPage){
    pNextPage = pPage->pNext;
    sqlite3DbFree(pFifo->db, pPage);
  }
  sqlite3VdbeFifoInit(pFifo, pFifo->db);
}

*************************************************************************
**
** This file contains code use to manipulate "Mem" structure.  A "Mem"
** stores a single value in the VDBE.  Mem is an opaque structure visible
** only within the VDBE.  Interface routines refer to a Mem using the
** name sqlite_value
**
** $Id: vdbemem.c,v 1.126 2008/11/11 00:21:30 drh Exp $
*/
#include "sqliteInt.h"
#include <ctype.h>
#include "vdbeInt.h"

/*
** Call sqlite3VdbeMemExpandBlob() on the supplied value (type Mem*)
................................................................................
**
** SQLITE_OK is returned if the conversion is successful (or not required).
** SQLITE_NOMEM may be returned if a malloc() fails during conversion
** between formats.
*/
int sqlite3VdbeChangeEncoding(Mem *pMem, int desiredEnc){
  int rc;

  if( !(pMem->flags&MEM_Str) || pMem->enc==desiredEnc ){
    return SQLITE_OK;
  }
  assert( pMem->db==0 || sqlite3_mutex_held(pMem->db->mutex) );
#ifdef SQLITE_OMIT_UTF16
  return SQLITE_ERROR;
#else
................................................................................
int sqlite3VdbeMemGrow(Mem *pMem, int n, int preserve){
  assert( 1 >=
    ((pMem->zMalloc && pMem->zMalloc==pMem->z) ? 1 : 0) +
    (((pMem->flags&MEM_Dyn)&&pMem->xDel) ? 1 : 0) + 
    ((pMem->flags&MEM_Ephem) ? 1 : 0) + 
    ((pMem->flags&MEM_Static) ? 1 : 0)
  );


  if( n<32 ) n = 32;
  if( sqlite3DbMallocSize(pMem->db, pMem->zMalloc)<n ){
    if( preserve && pMem->z==pMem->zMalloc ){
      pMem->z = pMem->zMalloc = sqlite3DbReallocOrFree(pMem->db, pMem->z, n);
      preserve = 0;
    }else{
................................................................................
** overwritten or altered.
**
** Return SQLITE_OK on success or SQLITE_NOMEM if malloc fails.
*/
int sqlite3VdbeMemMakeWriteable(Mem *pMem){
  int f;
  assert( pMem->db==0 || sqlite3_mutex_held(pMem->db->mutex) );

  expandBlob(pMem);
  f = pMem->flags;
  if( (f&(MEM_Str|MEM_Blob)) && pMem->z!=pMem->zMalloc ){
    if( sqlite3VdbeMemGrow(pMem, pMem->n + 2, 1) ){
      return SQLITE_NOMEM;
    }
    pMem->z[pMem->n] = 0;
................................................................................
** blob stored in dynamically allocated space.
*/
#ifndef SQLITE_OMIT_INCRBLOB
int sqlite3VdbeMemExpandBlob(Mem *pMem){
  if( pMem->flags & MEM_Zero ){
    int nByte;
    assert( pMem->flags&MEM_Blob );

    assert( pMem->db==0 || sqlite3_mutex_held(pMem->db->mutex) );

    /* Set nByte to the number of bytes required to store the expanded blob. */
    nByte = pMem->n + pMem->u.i;
    if( nByte<=0 ){
      nByte = 1;
    }
................................................................................
  int fg = pMem->flags;
  const int nByte = 32;

  assert( pMem->db==0 || sqlite3_mutex_held(pMem->db->mutex) );
  assert( !(fg&MEM_Zero) );
  assert( !(fg&(MEM_Str|MEM_Blob)) );
  assert( fg&(MEM_Int|MEM_Real) );



  if( sqlite3VdbeMemGrow(pMem, nByte, 0) ){
    return SQLITE_NOMEM;
  }

  /* For a Real or Integer, use sqlite3_mprintf() to produce the UTF-8
  ** string representation of the value. Then, if the required encoding
................................................................................
void sqlite3VdbeMemReleaseExternal(Mem *p){
  assert( p->db==0 || sqlite3_mutex_held(p->db->mutex) );
  if( p->flags&MEM_Agg ){
    sqlite3VdbeMemFinalize(p, p->u.pDef);
    assert( (p->flags & MEM_Agg)==0 );
    sqlite3VdbeMemRelease(p);
  }else if( p->flags&MEM_Dyn && p->xDel ){

    p->xDel((void *)p->z);
    p->xDel = 0;


  }
}

/*
** Release any memory held by the Mem. This may leave the Mem in an
** inconsistent state, for example with (Mem.z==0) and
** (Mem.type==SQLITE_TEXT).
................................................................................

/*
** The MEM structure is already a MEM_Real.  Try to also make it a
** MEM_Int if we can.
*/
void sqlite3VdbeIntegerAffinity(Mem *pMem){
  assert( pMem->flags & MEM_Real );

  assert( pMem->db==0 || sqlite3_mutex_held(pMem->db->mutex) );

  pMem->u.i = doubleToInt64(pMem->r);
  if( pMem->r==(double)pMem->u.i ){
    pMem->flags |= MEM_Int;
  }
}

static void setTypeFlag(Mem *pMem, int f){
  MemSetTypeFlag(pMem, f);
}

/*
** Convert pMem to type integer.  Invalidate any prior representations.
*/
int sqlite3VdbeMemIntegerify(Mem *pMem){
  assert( pMem->db==0 || sqlite3_mutex_held(pMem->db->mutex) );

  pMem->u.i = sqlite3VdbeIntValue(pMem);
  setTypeFlag(pMem, MEM_Int);
  return SQLITE_OK;
}

/*
** Convert pMem so that it is of type MEM_Real.
** Invalidate any prior representations.
*/
int sqlite3VdbeMemRealify(Mem *pMem){
  assert( pMem->db==0 || sqlite3_mutex_held(pMem->db->mutex) );
  pMem->r = sqlite3VdbeRealValue(pMem);
  setTypeFlag(pMem, MEM_Real);
  return SQLITE_OK;
}

/*
** Convert pMem so that it has types MEM_Real or MEM_Int or both.
** Invalidate any prior representations.
*/
................................................................................
  r1 = sqlite3VdbeRealValue(pMem);
  i = doubleToInt64(r1);
  r2 = (double)i;
  if( r1==r2 ){
    sqlite3VdbeMemIntegerify(pMem);
  }else{
    pMem->r = r1;
    setTypeFlag(pMem, MEM_Real);
  }
  return SQLITE_OK;
}

/*
** Delete any previous value and set the value stored in *pMem to NULL.
*/
void sqlite3VdbeMemSetNull(Mem *pMem){



  setTypeFlag(pMem, MEM_Null);
  pMem->type = SQLITE_NULL;
}

/*
** Delete any previous value and set the value to be a BLOB of length
** n containing all zeros.
*/
void sqlite3VdbeMemSetZeroBlob(Mem *pMem, int n){
  sqlite3VdbeMemRelease(pMem);
  setTypeFlag(pMem, MEM_Blob);
  pMem->flags = MEM_Blob|MEM_Zero;
  pMem->type = SQLITE_BLOB;
  pMem->n = 0;
  if( n<0 ) n = 0;
  pMem->u.i = n;
  pMem->enc = SQLITE_UTF8;
}
................................................................................
  }else{
    sqlite3VdbeMemRelease(pMem);
    pMem->r = val;
    pMem->flags = MEM_Real;
    pMem->type = SQLITE_FLOAT;
  }
}























/*
** Return true if the Mem object contains a TEXT or BLOB that is
** too large - whose size exceeds SQLITE_MAX_LENGTH.
*/
int sqlite3VdbeMemTooBig(Mem *p){
  assert( p->db!=0 );
................................................................................
/*
** Make an shallow copy of pFrom into pTo.  Prior contents of
** pTo are freed.  The pFrom->z field is not duplicated.  If
** pFrom->z is used, then pTo->z points to the same thing as pFrom->z
** and flags gets srcType (either MEM_Ephem or MEM_Static).
*/
void sqlite3VdbeMemShallowCopy(Mem *pTo, const Mem *pFrom, int srcType){

  sqlite3VdbeMemReleaseExternal(pTo);
  memcpy(pTo, pFrom, MEMCELLSIZE);
  pTo->xDel = 0;
  if( (pFrom->flags&MEM_Dyn)!=0 || pFrom->z==pFrom->zMalloc ){
    pTo->flags &= ~(MEM_Dyn|MEM_Static|MEM_Ephem);
    assert( srcType==MEM_Ephem || srcType==MEM_Static );
    pTo->flags |= srcType;
................................................................................
/*
** Make a full copy of pFrom into pTo.  Prior contents of pTo are
** freed before the copy is made.
*/
int sqlite3VdbeMemCopy(Mem *pTo, const Mem *pFrom){
  int rc = SQLITE_OK;


  sqlite3VdbeMemReleaseExternal(pTo);
  memcpy(pTo, pFrom, MEMCELLSIZE);
  pTo->flags &= ~MEM_Dyn;

  if( pTo->flags&(MEM_Str|MEM_Blob) ){
    if( 0==(pFrom->flags&MEM_Static) ){
      pTo->flags |= MEM_Ephem;
................................................................................
  void (*xDel)(void*) /* Destructor function */
){
  int nByte = n;      /* New value for pMem->n */
  int iLimit;         /* Maximum allowed string or blob size */
  int flags = 0;      /* New value for pMem->flags */

  assert( pMem->db==0 || sqlite3_mutex_held(pMem->db->mutex) );


  /* If z is a NULL pointer, set pMem to contain an SQL NULL. */
  if( !z ){
    sqlite3VdbeMemSetNull(pMem);
    return SQLITE_OK;
  }

................................................................................

  /* Interchange pMem1 and pMem2 if the collating sequence specifies
  ** DESC order.
  */
  f1 = pMem1->flags;
  f2 = pMem2->flags;
  combined_flags = f1|f2;

 
  /* If one value is NULL, it is less than the other. If both values
  ** are NULL, return 0.
  */
  if( combined_flags&MEM_Null ){
    return (f2&MEM_Null) - (f1&MEM_Null);
  }
................................................................................
  char *zData;       /* Data from the btree layer */
  int available = 0; /* Number of bytes available on the local btree page */
  sqlite3 *db;       /* Database connection */
  int rc = SQLITE_OK;

  db = sqlite3BtreeCursorDb(pCur);
  assert( sqlite3_mutex_held(db->mutex) );

  if( key ){
    zData = (char *)sqlite3BtreeKeyFetch(pCur, &available);
  }else{
    zData = (char *)sqlite3BtreeDataFetch(pCur, &available);
  }
  assert( zData!=0 );

................................................................................
** boundary.
*/
const void *sqlite3ValueText(sqlite3_value* pVal, u8 enc){
  if( !pVal ) return 0;

  assert( pVal->db==0 || sqlite3_mutex_held(pVal->db->mutex) );
  assert( (enc&3)==(enc&~SQLITE_UTF16_ALIGNED) );


  if( pVal->flags&MEM_Null ){
    return 0;
  }
  assert( (MEM_Blob>>3) == MEM_Str );
  pVal->flags |= (pVal->flags & MEM_Blob)>>3;
  expandBlob(pVal);

*************************************************************************
**
** This file contains code use to manipulate "Mem" structure.  A "Mem"
** stores a single value in the VDBE.  Mem is an opaque structure visible
** only within the VDBE.  Interface routines refer to a Mem using the
** name sqlite_value
**
** $Id: vdbemem.c,v 1.127 2008/12/04 20:40:10 drh Exp $
*/
#include "sqliteInt.h"
#include <ctype.h>
#include "vdbeInt.h"

/*
** Call sqlite3VdbeMemExpandBlob() on the supplied value (type Mem*)
................................................................................
**
** SQLITE_OK is returned if the conversion is successful (or not required).
** SQLITE_NOMEM may be returned if a malloc() fails during conversion
** between formats.
*/
int sqlite3VdbeChangeEncoding(Mem *pMem, int desiredEnc){
  int rc;
  assert( (pMem->flags&MEM_RowSet)==0 );
  if( !(pMem->flags&MEM_Str) || pMem->enc==desiredEnc ){
    return SQLITE_OK;
  }
  assert( pMem->db==0 || sqlite3_mutex_held(pMem->db->mutex) );
#ifdef SQLITE_OMIT_UTF16
  return SQLITE_ERROR;
#else
................................................................................
int sqlite3VdbeMemGrow(Mem *pMem, int n, int preserve){
  assert( 1 >=
    ((pMem->zMalloc && pMem->zMalloc==pMem->z) ? 1 : 0) +
    (((pMem->flags&MEM_Dyn)&&pMem->xDel) ? 1 : 0) + 
    ((pMem->flags&MEM_Ephem) ? 1 : 0) + 
    ((pMem->flags&MEM_Static) ? 1 : 0)
  );
  assert( (pMem->flags&MEM_RowSet)==0 );

  if( n<32 ) n = 32;
  if( sqlite3DbMallocSize(pMem->db, pMem->zMalloc)<n ){
    if( preserve && pMem->z==pMem->zMalloc ){
      pMem->z = pMem->zMalloc = sqlite3DbReallocOrFree(pMem->db, pMem->z, n);
      preserve = 0;
    }else{
................................................................................
** overwritten or altered.
**
** Return SQLITE_OK on success or SQLITE_NOMEM if malloc fails.
*/
int sqlite3VdbeMemMakeWriteable(Mem *pMem){
  int f;
  assert( pMem->db==0 || sqlite3_mutex_held(pMem->db->mutex) );
  assert( (pMem->flags&MEM_RowSet)==0 );
  expandBlob(pMem);
  f = pMem->flags;
  if( (f&(MEM_Str|MEM_Blob)) && pMem->z!=pMem->zMalloc ){
    if( sqlite3VdbeMemGrow(pMem, pMem->n + 2, 1) ){
      return SQLITE_NOMEM;
    }
    pMem->z[pMem->n] = 0;
................................................................................
** blob stored in dynamically allocated space.
*/
#ifndef SQLITE_OMIT_INCRBLOB
int sqlite3VdbeMemExpandBlob(Mem *pMem){
  if( pMem->flags & MEM_Zero ){
    int nByte;
    assert( pMem->flags&MEM_Blob );
    assert( (pMem->flags&MEM_RowSet)==0 );
    assert( pMem->db==0 || sqlite3_mutex_held(pMem->db->mutex) );

    /* Set nByte to the number of bytes required to store the expanded blob. */
    nByte = pMem->n + pMem->u.i;
    if( nByte<=0 ){
      nByte = 1;
    }
................................................................................
  int fg = pMem->flags;
  const int nByte = 32;

  assert( pMem->db==0 || sqlite3_mutex_held(pMem->db->mutex) );
  assert( !(fg&MEM_Zero) );
  assert( !(fg&(MEM_Str|MEM_Blob)) );
  assert( fg&(MEM_Int|MEM_Real) );
  assert( (pMem->flags&MEM_RowSet)==0 );


  if( sqlite3VdbeMemGrow(pMem, nByte, 0) ){
    return SQLITE_NOMEM;
  }

  /* For a Real or Integer, use sqlite3_mprintf() to produce the UTF-8
  ** string representation of the value. Then, if the required encoding
................................................................................
void sqlite3VdbeMemReleaseExternal(Mem *p){
  assert( p->db==0 || sqlite3_mutex_held(p->db->mutex) );
  if( p->flags&MEM_Agg ){
    sqlite3VdbeMemFinalize(p, p->u.pDef);
    assert( (p->flags & MEM_Agg)==0 );
    sqlite3VdbeMemRelease(p);
  }else if( p->flags&MEM_Dyn && p->xDel ){
    assert( (p->flags&MEM_RowSet)==0 );
    p->xDel((void *)p->z);
    p->xDel = 0;
  }else if( p->flags&MEM_RowSet ){
    sqlite3RowSetClear(p->u.pRowSet);
  }
}

/*
** Release any memory held by the Mem. This may leave the Mem in an
** inconsistent state, for example with (Mem.z==0) and
** (Mem.type==SQLITE_TEXT).
................................................................................

/*
** The MEM structure is already a MEM_Real.  Try to also make it a
** MEM_Int if we can.
*/
void sqlite3VdbeIntegerAffinity(Mem *pMem){
  assert( pMem->flags & MEM_Real );
  assert( (pMem->flags & MEM_RowSet)==0 );
  assert( pMem->db==0 || sqlite3_mutex_held(pMem->db->mutex) );

  pMem->u.i = doubleToInt64(pMem->r);
  if( pMem->r==(double)pMem->u.i ){
    pMem->flags |= MEM_Int;
  }
}





/*
** Convert pMem to type integer.  Invalidate any prior representations.
*/
int sqlite3VdbeMemIntegerify(Mem *pMem){
  assert( pMem->db==0 || sqlite3_mutex_held(pMem->db->mutex) );
  assert( (pMem->flags & MEM_RowSet)==0 );
  pMem->u.i = sqlite3VdbeIntValue(pMem);
  MemSetTypeFlag(pMem, MEM_Int);
  return SQLITE_OK;
}

/*
** Convert pMem so that it is of type MEM_Real.
** Invalidate any prior representations.
*/
int sqlite3VdbeMemRealify(Mem *pMem){
  assert( pMem->db==0 || sqlite3_mutex_held(pMem->db->mutex) );
  pMem->r = sqlite3VdbeRealValue(pMem);
  MemSetTypeFlag(pMem, MEM_Real);
  return SQLITE_OK;
}

/*
** Convert pMem so that it has types MEM_Real or MEM_Int or both.
** Invalidate any prior representations.
*/
................................................................................
  r1 = sqlite3VdbeRealValue(pMem);
  i = doubleToInt64(r1);
  r2 = (double)i;
  if( r1==r2 ){
    sqlite3VdbeMemIntegerify(pMem);
  }else{
    pMem->r = r1;
    MemSetTypeFlag(pMem, MEM_Real);
  }
  return SQLITE_OK;
}

/*
** Delete any previous value and set the value stored in *pMem to NULL.
*/
void sqlite3VdbeMemSetNull(Mem *pMem){
  if( pMem->flags & MEM_RowSet ){
    sqlite3RowSetClear(pMem->u.pRowSet);
  }
  MemSetTypeFlag(pMem, MEM_Null);
  pMem->type = SQLITE_NULL;
}

/*
** Delete any previous value and set the value to be a BLOB of length
** n containing all zeros.
*/
void sqlite3VdbeMemSetZeroBlob(Mem *pMem, int n){
  sqlite3VdbeMemRelease(pMem);
  MemSetTypeFlag(pMem, MEM_Blob);
  pMem->flags = MEM_Blob|MEM_Zero;
  pMem->type = SQLITE_BLOB;
  pMem->n = 0;
  if( n<0 ) n = 0;
  pMem->u.i = n;
  pMem->enc = SQLITE_UTF8;
}
................................................................................
  }else{
    sqlite3VdbeMemRelease(pMem);
    pMem->r = val;
    pMem->flags = MEM_Real;
    pMem->type = SQLITE_FLOAT;
  }
}

/*
** Delete any previous value and set the value of pMem to be an
** empty boolean index.
*/
void sqlite3VdbeMemSetRowSet(Mem *pMem){
  sqlite3 *db = pMem->db;
  assert( db!=0 );
  if( pMem->flags & MEM_RowSet ){
    sqlite3RowSetClear(pMem->u.pRowSet);
  }else{
    sqlite3VdbeMemRelease(pMem);
    pMem->zMalloc = sqlite3DbMallocRaw(db, 32);
  }
  if( !db->mallocFailed ){
    assert( pMem->zMalloc );
    pMem->u.pRowSet = sqlite3RowSetInit(db, pMem->zMalloc, 
                                       sqlite3DbMallocSize(db, pMem->zMalloc));
    assert( pMem->u.pRowSet!=0 );
    pMem->flags = MEM_RowSet|MEM_Dyn;
  }
}

/*
** Return true if the Mem object contains a TEXT or BLOB that is
** too large - whose size exceeds SQLITE_MAX_LENGTH.
*/
int sqlite3VdbeMemTooBig(Mem *p){
  assert( p->db!=0 );
................................................................................
/*
** Make an shallow copy of pFrom into pTo.  Prior contents of
** pTo are freed.  The pFrom->z field is not duplicated.  If
** pFrom->z is used, then pTo->z points to the same thing as pFrom->z
** and flags gets srcType (either MEM_Ephem or MEM_Static).
*/
void sqlite3VdbeMemShallowCopy(Mem *pTo, const Mem *pFrom, int srcType){
  assert( (pFrom->flags & MEM_RowSet)==0 );
  sqlite3VdbeMemReleaseExternal(pTo);
  memcpy(pTo, pFrom, MEMCELLSIZE);
  pTo->xDel = 0;
  if( (pFrom->flags&MEM_Dyn)!=0 || pFrom->z==pFrom->zMalloc ){
    pTo->flags &= ~(MEM_Dyn|MEM_Static|MEM_Ephem);
    assert( srcType==MEM_Ephem || srcType==MEM_Static );
    pTo->flags |= srcType;
................................................................................
/*
** Make a full copy of pFrom into pTo.  Prior contents of pTo are
** freed before the copy is made.
*/
int sqlite3VdbeMemCopy(Mem *pTo, const Mem *pFrom){
  int rc = SQLITE_OK;

  assert( (pFrom->flags & MEM_RowSet)==0 );
  sqlite3VdbeMemReleaseExternal(pTo);
  memcpy(pTo, pFrom, MEMCELLSIZE);
  pTo->flags &= ~MEM_Dyn;

  if( pTo->flags&(MEM_Str|MEM_Blob) ){
    if( 0==(pFrom->flags&MEM_Static) ){
      pTo->flags |= MEM_Ephem;
................................................................................
  void (*xDel)(void*) /* Destructor function */
){
  int nByte = n;      /* New value for pMem->n */
  int iLimit;         /* Maximum allowed string or blob size */
  int flags = 0;      /* New value for pMem->flags */

  assert( pMem->db==0 || sqlite3_mutex_held(pMem->db->mutex) );
  assert( (pMem->flags & MEM_RowSet)==0 );

  /* If z is a NULL pointer, set pMem to contain an SQL NULL. */
  if( !z ){
    sqlite3VdbeMemSetNull(pMem);
    return SQLITE_OK;
  }

................................................................................

  /* Interchange pMem1 and pMem2 if the collating sequence specifies
  ** DESC order.
  */
  f1 = pMem1->flags;
  f2 = pMem2->flags;
  combined_flags = f1|f2;
  assert( (combined_flags & MEM_RowSet)==0 );
 
  /* If one value is NULL, it is less than the other. If both values
  ** are NULL, return 0.
  */
  if( combined_flags&MEM_Null ){
    return (f2&MEM_Null) - (f1&MEM_Null);
  }
................................................................................
  char *zData;       /* Data from the btree layer */
  int available = 0; /* Number of bytes available on the local btree page */
  sqlite3 *db;       /* Database connection */
  int rc = SQLITE_OK;

  db = sqlite3BtreeCursorDb(pCur);
  assert( sqlite3_mutex_held(db->mutex) );
  assert( (pMem->flags & MEM_RowSet)==0 );
  if( key ){
    zData = (char *)sqlite3BtreeKeyFetch(pCur, &available);
  }else{
    zData = (char *)sqlite3BtreeDataFetch(pCur, &available);
  }
  assert( zData!=0 );

................................................................................
** boundary.
*/
const void *sqlite3ValueText(sqlite3_value* pVal, u8 enc){
  if( !pVal ) return 0;

  assert( pVal->db==0 || sqlite3_mutex_held(pVal->db->mutex) );
  assert( (enc&3)==(enc&~SQLITE_UTF16_ALIGNED) );
  assert( (pVal->flags & MEM_RowSet)==0 );

  if( pVal->flags&MEM_Null ){
    return 0;
  }
  assert( (MEM_Blob>>3) == MEM_Str );
  pVal->flags |= (pVal->flags & MEM_Blob)>>3;
  expandBlob(pVal);

   os_os2.c
   os_unix.c
   os_win.c

   bitvec.c
   pcache.c
   pcache1.c

   pager.c

   btmutex.c
   btree.c

   vdbefifo.c
   vdbemem.c
   vdbeaux.c
   vdbeapi.c
   vdbe.c
   vdbeblob.c
   journal.c
   memjournal.c

   os_os2.c
   os_unix.c
   os_win.c

   bitvec.c
   pcache.c
   pcache1.c
   rowset.c
   pager.c

   btmutex.c
   btree.c


   vdbemem.c
   vdbeaux.c
   vdbeapi.c
   vdbe.c
   vdbeblob.c
   journal.c
   memjournal.c