using System.Diagnostics;
using System.Text;
using FILE = System.IO.TextWriter;
using i16 = System.Int16;
using i32 = System.Int32;
using i64 = System.Int64;
using u8 = System.Byte;
using u16 = System.UInt16;
using u32 = System.UInt32;
using u64 = System.UInt64;
#if !SQLITE_MAX_VARIABLE_NUMBER
using ynVar = System.Int16;
#else
using ynVar = System.Int32;
#endif
/*
** The yDbMask datatype for the bitmask of all attached databases.
*/
#if SQLITE_MAX_ATTACHED//>30
// typedef sqlite3_uint64 yDbMask;
using yDbMask = System.Int64;
#else
// typedef unsigned int yDbMask;
using yDbMask = System.Int32;
#endif
namespace Community.CsharpSqlite
{
using System;
using Op = Sqlite3.VdbeOp;
using sqlite3_stmt = Sqlite3.Vdbe;
using sqlite3_value = Sqlite3.Mem;
public partial class Sqlite3
{
/*
** 2003 September 6
**
** 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 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.
*************************************************************************
** Included in SQLite3 port to C#-SQLite; 2008 Noah B Hart
** C#-SQLite is an independent reimplementation of the SQLite software library
**
** SQLITE_SOURCE_ID: 2011-06-23 19:49:22 4374b7e83ea0a3fbc3691f9c0c936272862f32f2
**
*************************************************************************
*/
//#include "sqliteInt.h"
//#include "vdbeInt.h"
/*
** When debugging the code generator in a symbolic debugger, one can
** set the sqlite3VdbeAddopTrace to 1 and all opcodes will be printed
** as they are added to the instruction stream.
*/
#if SQLITE_DEBUG
private static bool sqlite3VdbeAddopTrace = false;
#endif
/*
** Create a new virtual database engine.
*/
private static Vdbe sqlite3VdbeCreate(sqlite3 db)
{
Vdbe p;
p = new Vdbe();// sqlite3DbMallocZero(db, Vdbe).Length;
if (p == null)
return null;
p.db = db;
if (db.pVdbe != null)
{
db.pVdbe.pPrev = p;
}
p.pNext = db.pVdbe;
p.pPrev = null;
db.pVdbe = p;
p.magic = VDBE_MAGIC_INIT;
return p;
}
/*
** Remember the SQL string for a prepared statement.
*/
private static void sqlite3VdbeSetSql(Vdbe p, string z, int n, int isPrepareV2)
{
Debug.Assert(isPrepareV2 == 1 || isPrepareV2 == 0);
if (p == null)
return;
#if SQLITE_OMIT_TRACE
if( 0==isPrepareV2 ) return;
#endif
Debug.Assert(p.zSql == "");
p.zSql = z.Substring(0, n);// sqlite3DbStrNDup(p.db, z, n);
p.isPrepareV2 = isPrepareV2 != 0;
}
/*
** Return the SQL associated with a prepared statement
*/
static public string sqlite3_sql(sqlite3_stmt pStmt)
{
Vdbe p = (Vdbe)pStmt;
return (p != null && p.isPrepareV2 ? p.zSql : "");
}
/*
** Swap all content between two VDBE structures.
*/
private static void sqlite3VdbeSwap(Vdbe pA, Vdbe pB)
{
Vdbe tmp = new Vdbe();
Vdbe pTmp = new Vdbe();
string zTmp;
pA.CopyTo(tmp);
pB.CopyTo(pA);
tmp.CopyTo(pB);
pTmp = pA.pNext;
pA.pNext = pB.pNext;
pB.pNext = pTmp;
pTmp = pA.pPrev;
pA.pPrev = pB.pPrev;
pB.pPrev = pTmp;
zTmp = pA.zSql;
pA.zSql = pB.zSql;
pB.zSql = zTmp;
pB.isPrepareV2 = pA.isPrepareV2;
}
#if SQLITE_DEBUG
/*
** Turn tracing on or off
*/
private static void sqlite3VdbeTrace(Vdbe p, FILE trace)
{
p.trace = trace;
}
#endif
/*
** Resize the Vdbe.aOp array so that it is at least one op larger than
** it was.
**
** If an out-of-memory error occurs while resizing the array, return
** SQLITE_NOMEM. In this case Vdbe.aOp and Vdbe.nOpAlloc remain
** unchanged (this is so that any opcodes already allocated can be
** correctly deallocated along with the rest of the Vdbe).
*/
private static int growOpArray(Vdbe p)
{
//VdbeOp pNew;
int nNew = (p.nOpAlloc != 0 ? p.nOpAlloc * 2 : 1024 / 4);//(int)(1024/sizeof(Op)));
// pNew = sqlite3DbRealloc( p.db, p.aOp, nNew * sizeof( Op ) );
//if (pNew != null)
//{
// p.nOpAlloc = sqlite3DbMallocSize(p.db, pNew)/sizeof(Op);
// p.aOp = pNew;
//}
p.nOpAlloc = nNew;
if (p.aOp == null)
p.aOp = new VdbeOp[nNew];
else
Array.Resize(ref p.aOp, nNew);
return (p.aOp != null ? SQLITE_OK : SQLITE_NOMEM); // return (pNew ? SQLITE_OK : SQLITE_NOMEM);
}
/*
** Add a new instruction to the list of instructions current in the
** VDBE. Return the address of the new instruction.
**
** Parameters:
**
** p Pointer to the VDBE
**
** op The opcode for this instruction
**
** p1, p2, p3 Operands
**
** Use the sqlite3VdbeResolveLabel() function to fix an address and
** the sqlite3VdbeChangeP4() function to change the value of the P4
** operand.
*/
private static int sqlite3VdbeAddOp3(Vdbe p, int op, int p1, int p2, int p3)
{
int i;
VdbeOp pOp;
i = p.nOp;
Debug.Assert(p.magic == VDBE_MAGIC_INIT);
Debug.Assert(op > 0 && op < 0xff);
if (p.nOpAlloc <= i)
{
if (growOpArray(p) != 0)
{
return 1;
}
}
p.nOp++;
if (p.aOp[i] == null)
p.aOp[i] = new VdbeOp();
pOp = p.aOp[i];
pOp.opcode = (u8)op;
pOp.p5 = 0;
pOp.p1 = p1;
pOp.p2 = p2;
pOp.p3 = p3;
pOp.p4.p = null;
pOp.p4type = P4_NOTUSED;
#if SQLITE_DEBUG
pOp.zComment = null;
if (sqlite3VdbeAddopTrace)
sqlite3VdbePrintOp(null, i, p.aOp[i]);
#endif
#if VDBE_PROFILE
pOp.cycles = 0;
pOp.cnt = 0;
#endif
return i;
}
private static int sqlite3VdbeAddOp0(Vdbe p, int op)
{
return sqlite3VdbeAddOp3(p, op, 0, 0, 0);
}
private static int sqlite3VdbeAddOp1(Vdbe p, int op, int p1)
{
return sqlite3VdbeAddOp3(p, op, p1, 0, 0);
}
private static int sqlite3VdbeAddOp2(Vdbe p, int op, int p1, bool b2)
{
return sqlite3VdbeAddOp2(p, op, p1, (int)(b2 ? 1 : 0));
}
private static int sqlite3VdbeAddOp2(Vdbe p, int op, int p1, int p2)
{
return sqlite3VdbeAddOp3(p, op, p1, p2, 0);
}
/*
** Add an opcode that includes the p4 value as a pointer.
*/
//P4_INT32
private static int sqlite3VdbeAddOp4(Vdbe p, int op, int p1, int p2, int p3, i32 pP4, int p4type)
{
union_p4 _p4 = new union_p4();
_p4.i = pP4;
int addr = sqlite3VdbeAddOp3(p, op, p1, p2, p3);
sqlite3VdbeChangeP4(p, addr, _p4, p4type);
return addr;
}
//char
private static int sqlite3VdbeAddOp4(Vdbe p, int op, int p1, int p2, int p3, char pP4, int p4type)
{
union_p4 _p4 = new union_p4();
_p4.z = pP4.ToString();
int addr = sqlite3VdbeAddOp3(p, op, p1, p2, p3);
sqlite3VdbeChangeP4(p, addr, _p4, p4type);
return addr;
}
//StringBuilder
private static int sqlite3VdbeAddOp4(Vdbe p, int op, int p1, int p2, int p3, StringBuilder pP4, int p4type)
{
// Debug.Assert( pP4 != null );
union_p4 _p4 = new union_p4();
_p4.z = pP4.ToString();
int addr = sqlite3VdbeAddOp3(p, op, p1, p2, p3);
sqlite3VdbeChangeP4(p, addr, _p4, p4type);
return addr;
}
//String
private static int sqlite3VdbeAddOp4(Vdbe p, int op, int p1, int p2, int p3, string pP4, int p4type)
{
// Debug.Assert( pP4 != null );
union_p4 _p4 = new union_p4();
_p4.z = pP4;
int addr = sqlite3VdbeAddOp3(p, op, p1, p2, p3);
sqlite3VdbeChangeP4(p, addr, _p4, p4type);
return addr;
}
private static int sqlite3VdbeAddOp4(Vdbe p, int op, int p1, int p2, int p3, byte[] pP4, int p4type)
{
Debug.Assert(op == OP_Null || pP4 != null);
union_p4 _p4 = new union_p4();
_p4.z = Encoding.UTF8.GetString(pP4, 0, pP4.Length);
int addr = sqlite3VdbeAddOp3(p, op, p1, p2, p3);
sqlite3VdbeChangeP4(p, addr, _p4, p4type);
return addr;
}
//P4_INTARRAY
private static int sqlite3VdbeAddOp4(Vdbe p, int op, int p1, int p2, int p3, int[] pP4, int p4type)
{
Debug.Assert(pP4 != null);
union_p4 _p4 = new union_p4();
_p4.ai = pP4;
int addr = sqlite3VdbeAddOp3(p, op, p1, p2, p3);
sqlite3VdbeChangeP4(p, addr, _p4, p4type);
return addr;
}
//P4_INT64
private static int sqlite3VdbeAddOp4(Vdbe p, int op, int p1, int p2, int p3, i64 pP4, int p4type)
{
union_p4 _p4 = new union_p4();
_p4.pI64 = pP4;
int addr = sqlite3VdbeAddOp3(p, op, p1, p2, p3);
sqlite3VdbeChangeP4(p, addr, _p4, p4type);
return addr;
}
//DOUBLE (REAL)
private static int sqlite3VdbeAddOp4(Vdbe p, int op, int p1, int p2, int p3, double pP4, int p4type)
{
union_p4 _p4 = new union_p4();
_p4.pReal = pP4;
int addr = sqlite3VdbeAddOp3(p, op, p1, p2, p3);
sqlite3VdbeChangeP4(p, addr, _p4, p4type);
return addr;
}
//FUNCDEF
private static int sqlite3VdbeAddOp4(Vdbe p, int op, int p1, int p2, int p3, FuncDef pP4, int p4type)
{
union_p4 _p4 = new union_p4();
_p4.pFunc = pP4;
int addr = sqlite3VdbeAddOp3(p, op, p1, p2, p3);
sqlite3VdbeChangeP4(p, addr, _p4, p4type);
return addr;
}
//CollSeq
private static int sqlite3VdbeAddOp4(Vdbe p, int op, int p1, int p2, int p3, CollSeq pP4, int p4type)
{
union_p4 _p4 = new union_p4();
_p4.pColl = pP4;
int addr = sqlite3VdbeAddOp3(p, op, p1, p2, p3);
sqlite3VdbeChangeP4(p, addr, _p4, p4type);
return addr;
}
//KeyInfo
private static int sqlite3VdbeAddOp4(Vdbe p, int op, int p1, int p2, int p3, KeyInfo pP4, int p4type)
{
union_p4 _p4 = new union_p4();
_p4.pKeyInfo = pP4;
int addr = sqlite3VdbeAddOp3(p, op, p1, p2, p3);
sqlite3VdbeChangeP4(p, addr, _p4, p4type);
return addr;
}
#if !SQLITE_OMIT_VIRTUALTABLE
//VTable
private static int sqlite3VdbeAddOp4(Vdbe p, int op, int p1, int p2, int p3, VTable pP4, int p4type)
{
Debug.Assert(pP4 != null);
union_p4 _p4 = new union_p4();
_p4.pVtab = pP4;
int addr = sqlite3VdbeAddOp3(p, op, p1, p2, p3);
sqlite3VdbeChangeP4(p, addr, _p4, p4type);
return addr;
}
#endif
// static int sqlite3VdbeAddOp4(
// Vdbe p, /* Add the opcode to this VM */
// int op, /* The new opcode */
// int p1, /* The P1 operand */
// int p2, /* The P2 operand */
// int p3, /* The P3 operand */
// union_p4 _p4, /* The P4 operand */
// int p4type /* P4 operand type */
//)
// {
// int addr = sqlite3VdbeAddOp3(p, op, p1, p2, p3);
// sqlite3VdbeChangeP4(p, addr, _p4, p4type);
// return addr;
// }
/*
** Add an OP_ParseSchema opcode. This routine is broken out from
** sqlite3VdbeAddOp4() since it needs to also local all btrees.
**
** The zWhere string must have been obtained from sqlite3_malloc().
** This routine will take ownership of the allocated memory.
*/
private static void sqlite3VdbeAddParseSchemaOp(Vdbe p, int iDb, string zWhere)
{
int j;
int addr = sqlite3VdbeAddOp3(p, OP_ParseSchema, iDb, 0, 0);
sqlite3VdbeChangeP4(p, addr, zWhere, P4_DYNAMIC);
for (j = 0; j < p.db.nDb; j++)
sqlite3VdbeUsesBtree(p, j);
}
/*
** Add an opcode that includes the p4 value as an integer.
*/
private static int sqlite3VdbeAddOp4Int(
Vdbe p, /* Add the opcode to this VM */
int op, /* The new opcode */
int p1, /* The P1 operand */
int p2, /* The P2 operand */
int p3, /* The P3 operand */
int p4 /* The P4 operand as an integer */
)
{
union_p4 _p4 = new union_p4();
_p4.i = p4;
int addr = sqlite3VdbeAddOp3(p, op, p1, p2, p3);
sqlite3VdbeChangeP4(p, addr, _p4, P4_INT32);
return addr;
}
/*
** Create a new symbolic label for an instruction that has yet to be
** coded. The symbolic label is really just a negative number. The
** label can be used as the P2 value of an operation. Later, when
** the label is resolved to a specific address, the VDBE will scan
** through its operation list and change all values of P2 which match
** the label into the resolved address.
**
** The VDBE knows that a P2 value is a label because labels are
** always negative and P2 values are suppose to be non-negative.
** Hence, a negative P2 value is a label that has yet to be resolved.
**
** Zero is returned if a malloc() fails.
*/
private static int sqlite3VdbeMakeLabel(Vdbe p)
{
int i;
i = p.nLabel++;
Debug.Assert(p.magic == VDBE_MAGIC_INIT);
if (i >= p.nLabelAlloc)
{
int n = p.nLabelAlloc == 0 ? 15 : p.nLabelAlloc * 2 + 5;
if (p.aLabel == null)
p.aLabel = sqlite3Malloc(p.aLabel, n);
else
Array.Resize(ref p.aLabel, n);
//p.aLabel = sqlite3DbReallocOrFree(p.db, p.aLabel,
// n*sizeof(p.aLabel[0]));
p.nLabelAlloc = p.aLabel.Length;//sqlite3DbMallocSize(p.db, p.aLabel)/sizeof(p.aLabel[0]);
}
if (p.aLabel != null)
{
p.aLabel[i] = -1;
}
return -1 - i;
}
/*
** Resolve label "x" to be the address of the next instruction to
** be inserted. The parameter "x" must have been obtained from
** a prior call to sqlite3VdbeMakeLabel().
*/
private static void sqlite3VdbeResolveLabel(Vdbe p, int x)
{
int j = -1 - x;
Debug.Assert(p.magic == VDBE_MAGIC_INIT);
Debug.Assert(j >= 0 && j < p.nLabel);
if (p.aLabel != null)
{
p.aLabel[j] = p.nOp;
}
}
/*
** Mark the VDBE as one that can only be run one time.
*/
private static void sqlite3VdbeRunOnlyOnce(Vdbe p)
{
p.runOnlyOnce = 1;
}
#if SQLITE_DEBUG //* sqlite3AssertMayAbort() logic */
/*
** The following type and function are used to iterate through all opcodes
** in a Vdbe main program and each of the sub-programs (triggers) it may
** invoke directly or indirectly. It should be used as follows:
**
** Op *pOp;
** VdbeOpIter sIter;
**
** memset(&sIter, 0, sizeof(sIter));
** sIter.v = v; // v is of type Vdbe*
** while( (pOp = opIterNext(&sIter)) ){
** // Do something with pOp
** }
** sqlite3DbFree(v->db, sIter.apSub);
**
*/
//typedef struct VdbeOpIter VdbeOpIter;
public class VdbeOpIter
{
public Vdbe v; /* Vdbe to iterate through the opcodes of */
public SubProgram[] apSub; /* Array of subprograms */
public int nSub; /* Number of entries in apSub */
public int iAddr; /* Address of next instruction to return */
public int iSub; /* 0 = main program, 1 = first sub-program etc. */
};
private static Op opIterNext(VdbeOpIter p)
{
Vdbe v = p.v;
Op pRet = null;
Op[] aOp;
int nOp;
if (p.iSub <= p.nSub)
{
if (p.iSub == 0)
{
aOp = v.aOp;
nOp = v.nOp;
}
else
{
aOp = p.apSub[p.iSub - 1].aOp;
nOp = p.apSub[p.iSub - 1].nOp;
}
Debug.Assert(p.iAddr < nOp);
pRet = aOp[p.iAddr];
p.iAddr++;
if (p.iAddr == nOp)
{
p.iSub++;
p.iAddr = 0;
}
if (pRet.p4type == P4_SUBPROGRAM)
{
//int nByte = p.nSub + 1 ) * sizeof( SubProgram* );
int j;
for (j = 0; j < p.nSub; j++)
{
if (p.apSub[j] == pRet.p4.pProgram)
break;
}
if (j == p.nSub)
{
Array.Resize(ref p.apSub, p.nSub + 1);/// sqlite3DbReallocOrFree( v.db, p.apSub, nByte );
//if( null==p.apSub ){
// pRet = null;
//}else{
p.apSub[p.nSub++] = pRet.p4.pProgram;
//}
}
}
}
return pRet;
}
/*
** Check if the program stored in the VM associated with pParse may
** throw an ABORT exception (causing the statement, but not entire transaction
** to be rolled back). This condition is true if the main program or any
** sub-programs contains any of the following:
**
** * OP_Halt with P1=SQLITE_CONSTRAINT and P2=OE_Abort.
** * OP_HaltIfNull with P1=SQLITE_CONSTRAINT and P2=OE_Abort.
** * OP_Destroy
** * OP_VUpdate
** * OP_VRename
** * OP_FkCounter with P2==0 (immediate foreign key constraint)
**
** Then check that the value of Parse.mayAbort is true if an
** ABORT may be thrown, or false otherwise. Return true if it does
** match, or false otherwise. This function is intended to be used as
** part of an assert statement in the compiler. Similar to:
**
** Debug.Assert( sqlite3VdbeAssertMayAbort(pParse->pVdbe, pParse->mayAbort) );
*/
private static int sqlite3VdbeAssertMayAbort(Vdbe v, int mayAbort)
{
int hasAbort = 0;
Op pOp;
VdbeOpIter sIter;
sIter = new VdbeOpIter();// memset( &sIter, 0, sizeof( sIter ) );
sIter.v = v;
while ((pOp = opIterNext(sIter)) != null)
{
int opcode = pOp.opcode;
if (opcode == OP_Destroy || opcode == OP_VUpdate || opcode == OP_VRename
#if !SQLITE_OMIT_FOREIGN_KEY
|| (opcode == OP_FkCounter && pOp.p1 == 0 && pOp.p2 == 1)
#endif
|| ((opcode == OP_Halt || opcode == OP_HaltIfNull)
&& (pOp.p1 == SQLITE_CONSTRAINT && pOp.p2 == OE_Abort))
)
{
hasAbort = 1;
break;
}
}
sIter.apSub = null;// sqlite3DbFree( v.db, sIter.apSub );
/* Return true if hasAbort==mayAbort. Or if a malloc failure occured.
** If malloc failed, then the while() loop above may not have iterated
** through all opcodes and hasAbort may be set incorrectly. Return
** true for this case to prevent the Debug.Assert() in the callers frame
** from failing. */
return (hasAbort == mayAbort) ? 1 : 0;//v.db.mallocFailed !=0|| hasAbort==mayAbort );
}
#endif //* SQLITE_DEBUG - the sqlite3AssertMayAbort() function */
/*
** Loop through the program looking for P2 values that are negative
** on jump instructions. Each such value is a label. Resolve the
** label by setting the P2 value to its correct non-zero value.
**
** This routine is called once after all opcodes have been inserted.
**
** Variable *pMaxFuncArgs is set to the maximum value of any P2 argument
** to an OP_Function, OP_AggStep or OP_VFilter opcode. This is used by
** sqlite3VdbeMakeReady() to size the Vdbe.apArg[] array.
**
** The Op.opflags field is set on all opcodes.
*/
private static void resolveP2Values(Vdbe p, ref int pMaxFuncArgs)
{
int i;
int nMaxArgs = pMaxFuncArgs;
Op pOp;
int[] aLabel = p.aLabel;
p.readOnly = true;
for (i = 0; i < p.nOp; i++)// for(pOp=p->aOp, i=p->nOp-1; i>=0; i--, pOp++)
{
pOp = p.aOp[i];
u8 opcode = pOp.opcode;
pOp.opflags = (u8)sqlite3OpcodeProperty[opcode];
if (opcode == OP_Function || opcode == OP_AggStep)
{
if (pOp.p5 > nMaxArgs)
nMaxArgs = pOp.p5;
}
else if ((opcode == OP_Transaction && pOp.p2 != 0) || opcode == OP_Vacuum)
{
p.readOnly = false;
#if !SQLITE_OMIT_VIRTUALTABLE
}
else if (opcode == OP_VUpdate)
{
if (pOp.p2 > nMaxArgs)
nMaxArgs = pOp.p2;
}
else if (opcode == OP_VFilter)
{
int n;
Debug.Assert(p.nOp - i >= 3);
Debug.Assert(p.aOp[i - 1].opcode == OP_Integer);//pOp[-1].opcode==OP_Integer );
n = p.aOp[i - 1].p1;//pOp[-1].p1;
if (n > nMaxArgs)
nMaxArgs = n;
#endif
}
if ((pOp.opflags & OPFLG_JUMP) != 0 && pOp.p2 < 0)
{
Debug.Assert(-1 - pOp.p2 < p.nLabel);
pOp.p2 = aLabel[-1 - pOp.p2];
}
}
sqlite3DbFree(p.db, ref p.aLabel);
pMaxFuncArgs = nMaxArgs;
}
/*
** Return the address of the next instruction to be inserted.
*/
private static int sqlite3VdbeCurrentAddr(Vdbe p)
{
Debug.Assert(p.magic == VDBE_MAGIC_INIT);
return p.nOp;
}
/*
** This function returns a pointer to the array of opcodes associated with
** the Vdbe passed as the first argument. It is the callers responsibility
** to arrange for the returned array to be eventually freed using the
** vdbeFreeOpArray() function.
**
** Before returning, *pnOp is set to the number of entries in the returned
** array. Also, *pnMaxArg is set to the larger of its current value and
** the number of entries in the Vdbe.apArg[] array required to execute the
** returned program.
*/
private static VdbeOp[] sqlite3VdbeTakeOpArray(Vdbe p, ref int pnOp, ref int pnMaxArg)
{
VdbeOp[] aOp = p.aOp;
Debug.Assert(aOp != null);// && 0==p.db.mallocFailed );
/* Check that sqlite3VdbeUsesBtree() was not called on this VM */
Debug.Assert(p.btreeMask == 0);
resolveP2Values(p, ref pnMaxArg);
pnOp = p.nOp;
p.aOp = null;
return aOp;
}
/*
** Add a whole list of operations to the operation stack. Return the
** address of the first operation added.
*/
private static int sqlite3VdbeAddOpList(Vdbe p, int nOp, VdbeOpList[] aOp)
{
int addr;
Debug.Assert(p.magic == VDBE_MAGIC_INIT);
if (p.nOp + nOp > p.nOpAlloc && growOpArray(p) != 0)
{
return 0;
}
addr = p.nOp;
if (ALWAYS(nOp > 0))
{
int i;
VdbeOpList pIn;
for (i = 0; i < nOp; i++)
{
pIn = aOp[i];
int p2 = pIn.p2;
if (p.aOp[i + addr] == null)
p.aOp[i + addr] = new VdbeOp();
VdbeOp pOut = p.aOp[i + addr];
pOut.opcode = pIn.opcode;
pOut.p1 = pIn.p1;
if (p2 < 0 && (sqlite3OpcodeProperty[pOut.opcode] & OPFLG_JUMP) != 0)
{
pOut.p2 = addr + (-1 - p2);// ADDR(p2);
}
else
{
pOut.p2 = p2;
}
pOut.p3 = pIn.p3;
pOut.p4type = P4_NOTUSED;
pOut.p4.p = null;
pOut.p5 = 0;
#if SQLITE_DEBUG
pOut.zComment = null;
if (sqlite3VdbeAddopTrace)
{
sqlite3VdbePrintOp(null, i + addr, p.aOp[i + addr]);
}
#endif
}
p.nOp += nOp;
}
return addr;
}
/*
** Change the value of the P1 operand for a specific instruction.
** This routine is useful when a large program is loaded from a
** static array using sqlite3VdbeAddOpList but we want to make a
** few minor changes to the program.
*/
private static void sqlite3VdbeChangeP1(Vdbe p, int addr, int val)
{
Debug.Assert(p != null);
Debug.Assert(addr >= 0);
if (p.nOp > addr)
{
p.aOp[addr].p1 = val;
}
}
/*
** Change the value of the P2 operand for a specific instruction.
** This routine is useful for setting a jump destination.
*/
private static void sqlite3VdbeChangeP2(Vdbe p, int addr, int val)
{
Debug.Assert(p != null);
Debug.Assert(addr >= 0);
if (p.nOp > addr)
{
p.aOp[addr].p2 = val;
}
}
/*
** Change the value of the P3 operand for a specific instruction.
*/
private static void sqlite3VdbeChangeP3(Vdbe p, int addr, int val)
{
Debug.Assert(p != null);
Debug.Assert(addr >= 0);
if (p.nOp > addr)
{
p.aOp[addr].p3 = val;
}
}
/*
** Change the value of the P5 operand for the most recently
** added operation.
*/
private static void sqlite3VdbeChangeP5(Vdbe p, u8 val)
{
Debug.Assert(p != null);
if (p.aOp != null)
{
Debug.Assert(p.nOp > 0);
p.aOp[p.nOp - 1].p5 = val;
}
}
/*
** Change the P2 operand of instruction addr so that it points to
** the address of the next instruction to be coded.
*/
private static void sqlite3VdbeJumpHere(Vdbe p, int addr)
{
Debug.Assert(addr >= 0);
sqlite3VdbeChangeP2(p, addr, p.nOp);
}
/*
** If the input FuncDef structure is ephemeral, then free it. If
** the FuncDef is not ephermal, then do nothing.
*/
private static void freeEphemeralFunction(sqlite3 db, FuncDef pDef)
{
if (ALWAYS(pDef) && (pDef.flags & SQLITE_FUNC_EPHEM) != 0)
{
pDef = null;
sqlite3DbFree(db, ref pDef);
}
}
//static void vdbeFreeOpArray(sqlite3 *, Op *, int);
/*
** Delete a P4 value if necessary.
*/
private static void freeP4(sqlite3 db, int p4type, object p4)
{
if (p4 != null)
{
switch (p4type)
{
case P4_REAL:
case P4_INT64:
case P4_DYNAMIC:
case P4_KEYINFO:
case P4_INTARRAY:
case P4_KEYINFO_HANDOFF:
{
sqlite3DbFree(db, ref p4);
break;
}
case P4_MPRINTF:
{
if (db.pnBytesFreed == 0)
p4 = null;// sqlite3_free( ref p4 );
break;
}
case P4_VDBEFUNC:
{
VdbeFunc pVdbeFunc = (VdbeFunc)p4;
freeEphemeralFunction(db, pVdbeFunc.pFunc);
if (db.pnBytesFreed == 0)
sqlite3VdbeDeleteAuxData(pVdbeFunc, 0);
sqlite3DbFree(db, ref pVdbeFunc);
break;
}
case P4_FUNCDEF:
{
freeEphemeralFunction(db, (FuncDef)p4);
break;
}
case P4_MEM:
{
if (db.pnBytesFreed == 0)
{
p4 = null;// sqlite3ValueFree(ref (sqlite3_value)p4);
}
else
{
Mem p = (Mem)p4;
//sqlite3DbFree( db, ref p.zMalloc );
sqlite3DbFree(db, ref p);
}
break;
}
case P4_VTAB:
{
if (db.pnBytesFreed == 0)
sqlite3VtabUnlock((VTable)p4);
break;
}
}
}
}
/*
** Free the space allocated for aOp and any p4 values allocated for the
** opcodes contained within. If aOp is not NULL it is assumed to contain
** nOp entries.
*/
private static void vdbeFreeOpArray(sqlite3 db, ref Op[] aOp, int nOp)
{
if (aOp != null)
{
//Op pOp;
// for(pOp=aOp; pOp<&aOp[nOp]; pOp++){
// freeP4(db, pOp.p4type, pOp.p4.p);
//#if SQLITE_DEBUG
// sqlite3DbFree(db, ref pOp.zComment);
//#endif
// }
// }
// sqlite3DbFree(db, aOp);
aOp = null;
}
}
/*
** Link the SubProgram object passed as the second argument into the linked
** list at Vdbe.pSubProgram. This list is used to delete all sub-program
** objects when the VM is no longer required.
*/
private static void sqlite3VdbeLinkSubProgram(Vdbe pVdbe, SubProgram p)
{
p.pNext = pVdbe.pProgram;
pVdbe.pProgram = p;
}
/*
** Change N opcodes starting at addr to No-ops.
*/
private static void sqlite3VdbeChangeToNoop(Vdbe p, int addr, int N)
{
if (p.aOp != null)
{
sqlite3 db = p.db;
while (N-- > 0)
{
VdbeOp pOp = p.aOp[addr + N];
freeP4(db, pOp.p4type, pOp.p4.p);
pOp = p.aOp[addr + N] = new VdbeOp();//memset(pOp, 0, sizeof(pOp[0]));
pOp.opcode = OP_Noop;
//pOp++;
}
}
}
/*
** Change the value of the P4 operand for a specific instruction.
** This routine is useful when a large program is loaded from a
** static array using sqlite3VdbeAddOpList but we want to make a
** few minor changes to the program.
**
** If n>=0 then the P4 operand is dynamic, meaning that a copy of
** the string is made into memory obtained from sqlite3Malloc().
** A value of n==0 means copy bytes of zP4 up to and including the
** first null byte. If n>0 then copy n+1 bytes of zP4.
**
** If n==P4_KEYINFO it means that zP4 is a pointer to a KeyInfo structure.
** A copy is made of the KeyInfo structure into memory obtained from
** sqlite3Malloc, to be freed when the Vdbe is finalized.
** n==P4_KEYINFO_HANDOFF indicates that zP4 points to a KeyInfo structure
** stored in memory that the caller has obtained from sqlite3Malloc. The
** caller should not free the allocation, it will be freed when the Vdbe is
** finalized.
**
** Other values of n (P4_STATIC, P4_COLLSEQ etc.) indicate that zP4 points
** to a string or structure that is guaranteed to exist for the lifetime of
** the Vdbe. In these cases we can just copy the pointer.
**
** If addr<0 then change P4 on the most recently inserted instruction.
*/
//P4_COLLSEQ
private static void sqlite3VdbeChangeP4(Vdbe p, int addr, CollSeq pColl, int n)
{
union_p4 _p4 = new union_p4();
_p4.pColl = pColl;
sqlite3VdbeChangeP4(p, addr, _p4, n);
}
//P4_FUNCDEF
private static void sqlite3VdbeChangeP4(Vdbe p, int addr, FuncDef pFunc, int n)
{
union_p4 _p4 = new union_p4();
_p4.pFunc = pFunc;
sqlite3VdbeChangeP4(p, addr, _p4, n);
}
//P4_INT32
private static void sqlite3VdbeChangeP4(Vdbe p, int addr, int i32n, int n)
{
union_p4 _p4 = new union_p4();
_p4.i = i32n;
sqlite3VdbeChangeP4(p, addr, _p4, n);
}
//P4_KEYINFO
private static void sqlite3VdbeChangeP4(Vdbe p, int addr, KeyInfo pKeyInfo, int n)
{
union_p4 _p4 = new union_p4();
_p4.pKeyInfo = pKeyInfo;
sqlite3VdbeChangeP4(p, addr, _p4, n);
}
//CHAR
private static void sqlite3VdbeChangeP4(Vdbe p, int addr, char c, int n)
{
union_p4 _p4 = new union_p4();
_p4.z = c.ToString();
sqlite3VdbeChangeP4(p, addr, _p4, n);
}
//MEM
private static void sqlite3VdbeChangeP4(Vdbe p, int addr, Mem m, int n)
{
union_p4 _p4 = new union_p4();
_p4.pMem = m;
sqlite3VdbeChangeP4(p, addr, _p4, n);
}
//STRING
//STRING + Type
private static void sqlite3VdbeChangeP4(Vdbe p, int addr, string z, dxDel P4_Type)
{
union_p4 _p4 = new union_p4();
_p4.z = z;
sqlite3VdbeChangeP4(p, addr, _p4, P4_DYNAMIC);
}
//SUBPROGRAM
private static void sqlite3VdbeChangeP4(Vdbe p, int addr, SubProgram pProgram, int n)
{
union_p4 _p4 = new union_p4();
_p4.pProgram = pProgram;
sqlite3VdbeChangeP4(p, addr, _p4, n);
}
private static void sqlite3VdbeChangeP4(Vdbe p, int addr, string z, int n)
{
union_p4 _p4 = new union_p4();
if (n > 0 && n <= z.Length)
_p4.z = z.Substring(0, n);
else
_p4.z = z;
sqlite3VdbeChangeP4(p, addr, _p4, n);
}
private static void sqlite3VdbeChangeP4(Vdbe p, int addr, union_p4 _p4, int n)
{
Op pOp;
sqlite3 db;
Debug.Assert(p != null);
db = p.db;
Debug.Assert(p.magic == VDBE_MAGIC_INIT);
if (p.aOp == null /*|| db.mallocFailed != 0 */)
{
if (n != P4_KEYINFO && n != P4_VTAB)
{
freeP4(db, n, _p4);
}
return;
}
Debug.Assert(p.nOp > 0);
Debug.Assert(addr < p.nOp);
if (addr < 0)
{
addr = p.nOp - 1;
}
pOp = p.aOp[addr];
freeP4(db, pOp.p4type, pOp.p4.p);
pOp.p4.p = null;
if (n == P4_INT32)
{
/* Note: this cast is safe, because the origin data point was an int
** that was cast to a (string ). */
pOp.p4.i = _p4.i; // SQLITE_PTR_TO_INT(zP4);
pOp.p4type = P4_INT32;
}
else if (n == P4_INT64)
{
pOp.p4.pI64 = _p4.pI64;
pOp.p4type = n;
}
else if (n == P4_REAL)
{
pOp.p4.pReal = _p4.pReal;
pOp.p4type = n;
}
else if (_p4 == null)
{
pOp.p4.p = null;
pOp.p4type = P4_NOTUSED;
}
else if (n == P4_KEYINFO)
{
KeyInfo pKeyInfo;
int nByte;
//int nField = _p4.pKeyInfo.nField;
//nByte = sizeof(*pKeyInfo) + (nField-1)*sizeof(pKeyInfo.aColl[0]) + nField;
pKeyInfo = new KeyInfo();//sqlite3DbMallocRaw(0, nByte);
pOp.p4.pKeyInfo = pKeyInfo;
if (pKeyInfo != null)
{
//u8 *aSortOrder;
// memcpy((char)pKeyInfo, zP4, nByte - nField);
//aSortOrder = pKeyInfo.aSortOrder;
//if( aSortOrder ){
// pKeyInfo.aSortOrder = (unsigned char)&pKeyInfo.aColl[nField];
// memcpy(pKeyInfo.aSortOrder, aSortOrder, nField);
//}
pKeyInfo = _p4.pKeyInfo.Copy();
pOp.p4type = P4_KEYINFO;
}
else
{
//p.db.mallocFailed = 1;
pOp.p4type = P4_NOTUSED;
}
pOp.p4.pKeyInfo = _p4.pKeyInfo;
pOp.p4type = P4_KEYINFO;
}
else if (n == P4_KEYINFO_HANDOFF || n == P4_KEYINFO_STATIC)
{
pOp.p4.pKeyInfo = _p4.pKeyInfo;
pOp.p4type = P4_KEYINFO;
}
else if (n == P4_FUNCDEF)
{
pOp.p4.pFunc = _p4.pFunc;
pOp.p4type = P4_FUNCDEF;
}
else if (n == P4_COLLSEQ)
{
pOp.p4.pColl = _p4.pColl;
pOp.p4type = P4_COLLSEQ;
}
else if (n == P4_DYNAMIC || n == P4_STATIC || n == P4_MPRINTF)
{
pOp.p4.z = _p4.z;
pOp.p4type = P4_DYNAMIC;
}
else if (n == P4_MEM)
{
pOp.p4.pMem = _p4.pMem;
pOp.p4type = P4_MEM;
}
else if (n == P4_INTARRAY)
{
pOp.p4.ai = _p4.ai;
pOp.p4type = P4_INTARRAY;
}
else if (n == P4_SUBPROGRAM)
{
pOp.p4.pProgram = _p4.pProgram;
pOp.p4type = P4_SUBPROGRAM;
}
else if (n == P4_VTAB)
{
pOp.p4.pVtab = _p4.pVtab;
pOp.p4type = P4_VTAB;
sqlite3VtabLock(_p4.pVtab);
Debug.Assert((_p4.pVtab).db == p.db);
}
else if (n < 0)
{
pOp.p4.p = _p4.p;
pOp.p4type = n;
}
else
{
//if (n == 0) n = n = sqlite3Strlen30(zP4);
pOp.p4.z = _p4.z;// sqlite3DbStrNDup(p.db, zP4, n);
pOp.p4type = P4_DYNAMIC;
}
}
#if !NDEBUG
/*
** Change the comment on the the most recently coded instruction. Or
** insert a No-op and add the comment to that new instruction. This
** makes the code easier to read during debugging. None of this happens
** in a production build.
*/
private static void sqlite3VdbeComment(Vdbe p, string zFormat, params object[] ap)
{
if (null == p)
return;
// va_list ap;
lock (lock_va_list)
{
Debug.Assert(p.nOp > 0 || p.aOp == null);
Debug.Assert(p.aOp == null || p.aOp[p.nOp - 1].zComment == null /* || p.db.mallocFailed != 0 */);
if (p.nOp != 0)
{
string pz;// = p.aOp[p.nOp-1].zComment;
va_start(ap, zFormat);
//sqlite3DbFree(db, ref pz);
pz = sqlite3VMPrintf(p.db, zFormat, ap);
p.aOp[p.nOp - 1].zComment = pz;
va_end(ref ap);
}
}
}
private static void sqlite3VdbeNoopComment(Vdbe p, string zFormat, params object[] ap)
{
if (null == p)
return;
//va_list ap;
lock (lock_va_list)
{
sqlite3VdbeAddOp0(p, OP_Noop);
Debug.Assert(p.nOp > 0 || p.aOp == null);
Debug.Assert(p.aOp == null || p.aOp[p.nOp - 1].zComment == null /* || p.db.mallocFailed != 0 */);
if (p.nOp != 0)
{
string pz; // = p.aOp[p.nOp - 1].zComment;
va_start(ap, zFormat);
//sqlite3DbFree(db,ref pz);
pz = sqlite3VMPrintf(p.db, zFormat, ap);
p.aOp[p.nOp - 1].zComment = pz;
va_end(ref ap);
}
}
}
#else
#endif //* NDEBUG */
/*
** Return the opcode for a given address. If the address is -1, then
** return the most recently inserted opcode.
**
** If a memory allocation error has occurred prior to the calling of this
** routine, then a pointer to a dummy VdbeOp will be returned. That opcode
** is readable but not writable, though it is cast to a writable value.
** The return of a dummy opcode allows the call to continue functioning
** after a OOM fault without having to check to see if the return from
** this routine is a valid pointer. But because the dummy.opcode is 0,
** dummy will never be written to. This is verified by code inspection and
** by running with Valgrind.
**
** About the #if SQLITE_OMIT_TRACE: Normally, this routine is never called
** unless p->nOp>0. This is because in the absense of SQLITE_OMIT_TRACE,
** an OP_Trace instruction is always inserted by sqlite3VdbeGet() as soon as
** a new VDBE is created. So we are free to set addr to p->nOp-1 without
** having to double-check to make sure that the result is non-negative. But
** if SQLITE_OMIT_TRACE is defined, the OP_Trace is omitted and we do need to
** check the value of p->nOp-1 before continuing.
*/
private const VdbeOp dummy = null; /* Ignore the MSVC warning about no initializer */
private static VdbeOp sqlite3VdbeGetOp(Vdbe p, int addr)
{
/* C89 specifies that the constant "dummy" will be initialized to all
** zeros, which is correct. MSVC generates a warning, nevertheless. */
Debug.Assert(p.magic == VDBE_MAGIC_INIT);
if (addr < 0)
{
#if SQLITE_OMIT_TRACE
if( p.nOp==0 ) return dummy;
#endif
addr = p.nOp - 1;
}
Debug.Assert((addr >= 0 && addr < p.nOp) /* || p.db.mallocFailed != 0 */);
//if ( p.db.mallocFailed != 0 )
//{
// return dummy;
//}
//else
{
return p.aOp[addr];
}
}
#if !SQLITE_OMIT_EXPLAIN || !NDEBUG || VDBE_PROFILE || SQLITE_DEBUG
/*
** Compute a string that describes the P4 parameter for an opcode.
** Use zTemp for any required temporary buffer space.
*/
private static StringBuilder zTemp = new StringBuilder(100);
private static string displayP4(Op pOp, string zBuffer, int nTemp)
{
zTemp.Length = 0;
Debug.Assert(nTemp >= 20);
switch (pOp.p4type)
{
case P4_KEYINFO_STATIC:
case P4_KEYINFO:
{
int i, j;
KeyInfo pKeyInfo = pOp.p4.pKeyInfo;
sqlite3_snprintf(nTemp, zTemp, "keyinfo(%d", pKeyInfo.nField);
i = sqlite3Strlen30(zTemp);
for (j = 0; j < pKeyInfo.nField; j++)
{
CollSeq pColl = pKeyInfo.aColl[j];
if (pColl != null)
{
int n = sqlite3Strlen30(pColl.zName);
if (i + n > nTemp)
{
zTemp.Append(",..."); // memcpy( &zTemp[i], ",...", 4 );
break;
}
zTemp.Append(",");// zTemp[i++] = ',';
if (pKeyInfo.aSortOrder != null && pKeyInfo.aSortOrder[j] != 0)
{
zTemp.Append("-");// zTemp[i++] = '-';
}
zTemp.Append(pColl.zName);// memcpy( &zTemp[i], pColl.zName, n + 1 );
i += n;
}
else if (i + 4 < nTemp)
{
zTemp.Append(",nil");// memcpy( &zTemp[i], ",nil", 4 );
i += 4;
}
}
zTemp.Append(")");// zTemp[i++] = ')';
//zTemp[i] = 0;
Debug.Assert(i < nTemp);
break;
}
case P4_COLLSEQ:
{
CollSeq pColl = pOp.p4.pColl;
sqlite3_snprintf(nTemp, zTemp, "collseq(%.20s)", (pColl != null ? pColl.zName : "null"));
break;
}
case P4_FUNCDEF:
{
FuncDef pDef = pOp.p4.pFunc;
sqlite3_snprintf(nTemp, zTemp, "%s(%d)", pDef.zName, pDef.nArg);
break;
}
case P4_INT64:
{
sqlite3_snprintf(nTemp, zTemp, "%lld", pOp.p4.pI64);
break;
}
case P4_INT32:
{
sqlite3_snprintf(nTemp, zTemp, "%d", pOp.p4.i);
break;
}
case P4_REAL:
{
sqlite3_snprintf(nTemp, zTemp, "%.16g", pOp.p4.pReal);
break;
}
case P4_MEM:
{
Mem pMem = pOp.p4.pMem;
Debug.Assert((pMem.flags & MEM_Null) == 0);
if ((pMem.flags & MEM_Str) != 0)
{
zTemp.Append(pMem.z);
}
else if ((pMem.flags & MEM_Int) != 0)
{
sqlite3_snprintf(nTemp, zTemp, "%lld", pMem.u.i);
}
else if ((pMem.flags & MEM_Real) != 0)
{
sqlite3_snprintf(nTemp, zTemp, "%.16g", pMem.r);
}
else
{
Debug.Assert((pMem.flags & MEM_Blob) != 0);
zTemp = new StringBuilder("(blob)");
}
break;
}
#if !SQLITE_OMIT_VIRTUALTABLE
case P4_VTAB:
{
sqlite3_vtab pVtab = pOp.p4.pVtab.pVtab;
sqlite3_snprintf(nTemp, zTemp, "vtab:%p:%p", pVtab, pVtab.pModule);
break;
}
#endif
case P4_INTARRAY:
{
sqlite3_snprintf(nTemp, zTemp, "intarray");
break;
}
case P4_SUBPROGRAM:
{
sqlite3_snprintf(nTemp, zTemp, "program");
break;
}
default:
{
if (pOp.p4.z != null)
zTemp.Append(pOp.p4.z);
//if ( zTemp == null )
//{
// zTemp = "";
//}
break;
}
}
Debug.Assert(zTemp != null);
return zTemp.ToString();
}
#endif
/*
** Declare to the Vdbe that the BTree object at db->aDb[i] is used.
**
** The prepared statements need to know in advance the complete set of
** attached databases that they will be using. A mask of these databases
** is maintained in p->btreeMask and is used for locking and other purposes.
*/
private static void sqlite3VdbeUsesBtree(Vdbe p, int i)
{
Debug.Assert(i >= 0 && i < p.db.nDb && i < (int)sizeof(yDbMask) * 8);
Debug.Assert(i < (int)sizeof(yDbMask) * 8);
p.btreeMask |= ((yDbMask)1) << i;
if (i != 1 && sqlite3BtreeSharable(p.db.aDb[i].pBt))
{
p.lockMask |= ((yDbMask)1) << i;
}
}
#if !(SQLITE_OMIT_SHARED_CACHE) && SQLITE_THREADSAFE//>0
/*
** If SQLite is compiled to support shared-cache mode and to be threadsafe,
** this routine obtains the mutex Debug.Associated with each BtShared structure
** that may be accessed by the VM pDebug.Assed as an argument. In doing so it also
** sets the BtShared.db member of each of the BtShared structures, ensuring
** that the correct busy-handler callback is invoked if required.
**
** If SQLite is not threadsafe but does support shared-cache mode, then
** sqlite3BtreeEnter() is invoked to set the BtShared.db variables
** of all of BtShared structures accessible via the database handle
** Debug.Associated with the VM.
**
** If SQLite is not threadsafe and does not support shared-cache mode, this
** function is a no-op.
**
** The p.btreeMask field is a bitmask of all btrees that the prepared
** statement p will ever use. Let N be the number of bits in p.btreeMask
** corresponding to btrees that use shared cache. Then the runtime of
** this routine is N*N. But as N is rarely more than 1, this should not
** be a problem.
*/
void sqlite3VdbeEnter(Vdbe *p){
int i;
yDbMask mask;
sqlite3 db;
Db *aDb;
int nDb;
if( p.lockMask==0 ) return; /* The common case */
db = p.db;
aDb = db.aDb;
nDb = db.nDb;
for(i=0, mask=1; i0
/*
** Unlock all of the btrees previously locked by a call to sqlite3VdbeEnter().
*/
void sqlite3VdbeLeave(Vdbe *p){
int i;
yDbMask mask;
sqlite3 db;
Db *aDb;
int nDb;
if( p.lockMask==0 ) return; /* The common case */
db = p.db;
aDb = db.aDb;
nDb = db.nDb;
for(i=0, mask=1; i starting && p[starting] != null && N != 0)
{
Mem pEnd;
//sqlite3 db = p[starting].db;
//u8 malloc_failed = db.mallocFailed;
//if ( db != null ) //&& db.pnBytesFreed != 0 )
//{
// for ( int i = starting; i < N; i++ )//pEnd = p[N] ; p < pEnd ; p++ )
// {
// sqlite3DbFree( db, ref p[i].zMalloc );
// }
// return;
//}
for (int i = starting; i < N; i++)//pEnd = p[N] ; p < pEnd ; p++ )
{
pEnd = p[i];
Debug.Assert( //( p[1] ) == pEnd ||
N == 1 || i == p.Length - 1 || p[starting].db == p[starting + 1].db);
/* This block is really an inlined version of sqlite3VdbeMemRelease()
** that takes advantage of the fact that the memory cell value is
** being set to NULL after releasing any dynamic resources.
**
** The justification for duplicating code is that according to
** callgrind, this causes a certain test case to hit the CPU 4.7
** percent less (x86 linux, gcc version 4.1.2, -O6) than if
** sqlite3MemRelease() were called from here. With -O2, this jumps
** to 6.6 percent. The test case is inserting 1000 rows into a table
** with no indexes using a single prepared INSERT statement, bind()
** and reset(). Inserts are grouped into a transaction.
*/
if (pEnd != null)
{
if ((pEnd.flags & (MEM_Agg | MEM_Dyn | MEM_Frame | MEM_RowSet)) != 0)
{
sqlite3VdbeMemRelease(pEnd);
}
//else if ( pEnd.zMalloc != null )
//{
// sqlite3DbFree( db, ref pEnd.zMalloc );
// pEnd.zMalloc = 0;
//}
pEnd.z = null;
pEnd.n = 0;
pEnd.flags = MEM_Null;
sqlite3_free(ref pEnd._Mem);
sqlite3_free(ref pEnd.zBLOB);
}
}
// db.mallocFailed = malloc_failed;
}
}
/*
** Delete a VdbeFrame object and its contents. VdbeFrame objects are
** allocated by the OP_Program opcode in sqlite3VdbeExec().
*/
private static void sqlite3VdbeFrameDelete(VdbeFrame p)
{
int i;
//Mem[] aMem = VdbeFrameMem(p);
VdbeCursor[] apCsr = p.aChildCsr;// (VdbeCursor)aMem[p.nChildMem];
for (i = 0; i < p.nChildCsr; i++)
{
sqlite3VdbeFreeCursor(p.v, apCsr[i]);
}
releaseMemArray(p.aChildMem, p.nChildMem);
p = null;// sqlite3DbFree( p.v.db, p );
}
#if !SQLITE_OMIT_EXPLAIN
/*
** Give a listing of the program in the virtual machine.
**
** The interface is the same as sqlite3VdbeExec(). But instead of
** running the code, it invokes the callback once for each instruction.
** This feature is used to implement "EXPLAIN".
**
** When p.explain==1, each instruction is listed. When
** p.explain==2, only OP_Explain instructions are listed and these
** are shown in a different format. p.explain==2 is used to implement
** EXPLAIN QUERY PLAN.
**
** When p->explain==1, first the main program is listed, then each of
** the trigger subprograms are listed one by one.
*/
private static int sqlite3VdbeList(
Vdbe p /* The VDBE */
)
{
int nRow; /* Stop when row count reaches this */
int nSub = 0; /* Number of sub-vdbes seen so far */
SubProgram[] apSub = null; /* Array of sub-vdbes */
Mem pSub = null; /* Memory cell hold array of subprogs */
sqlite3 db = p.db; /* The database connection */
int i; /* Loop counter */
int rc = SQLITE_OK; /* Return code */
if (p.pResultSet == null)
p.pResultSet = new Mem[0];//Mem* pMem = p.pResultSet = p.aMem[1]; /* First Mem of result set */
Mem pMem;
Debug.Assert(p.explain != 0);
Debug.Assert(p.magic == VDBE_MAGIC_RUN);
Debug.Assert(p.rc == SQLITE_OK || p.rc == SQLITE_BUSY || p.rc == SQLITE_NOMEM);
/* Even though this opcode does not use dynamic strings for
** the result, result columns may become dynamic if the user calls
** sqlite3_column_text16(), causing a translation to UTF-16 encoding.
*/
releaseMemArray(p.pResultSet, 8);
//if ( p.rc == SQLITE_NOMEM )
//{
// /* This happens if a malloc() inside a call to sqlite3_column_text() or
// ** sqlite3_column_text16() failed. */
// db.mallocFailed = 1;
// return SQLITE_ERROR;
//}
/* When the number of output rows reaches nRow, that means the
** listing has finished and sqlite3_step() should return SQLITE_DONE.
** nRow is the sum of the number of rows in the main program, plus
** the sum of the number of rows in all trigger subprograms encountered
** so far. The nRow value will increase as new trigger subprograms are
** encountered, but p->pc will eventually catch up to nRow.
*/
nRow = p.nOp;
int i_pMem;
if (p.explain == 1)
{
/* The first 8 memory cells are used for the result set. So we will
** commandeer the 9th cell to use as storage for an array of pointers
** to trigger subprograms. The VDBE is guaranteed to have at least 9
** cells. */
Debug.Assert(p.nMem > 9);
pSub = p.aMem[9];
if ((pSub.flags & MEM_Blob) != 0)
{
/* On the first call to sqlite3_step(), pSub will hold a NULL. It is
** initialized to a BLOB by the P4_SUBPROGRAM processing logic below */
apSub = p.aMem[9]._SubProgram; // apSub = (SubProgram*)pSub->z;
nSub = apSub.Length;// pSub->n / sizeof( Vdbe* );
}
for (i = 0; i < nSub; i++)
{
nRow += apSub[i].nOp;
}
}
i_pMem = 0;
if (i_pMem >= p.pResultSet.Length)
Array.Resize(ref p.pResultSet, 8 + p.pResultSet.Length);
{
p.pResultSet[i_pMem] = sqlite3Malloc(p.pResultSet[i_pMem]);
}
pMem = p.pResultSet[i_pMem++];
do
{
i = p.pc++;
} while (i < nRow && p.explain == 2 && p.aOp[i].opcode != OP_Explain);
if (i >= nRow)
{
p.rc = SQLITE_OK;
rc = SQLITE_DONE;
}
else if (db.u1.isInterrupted)
{
p.rc = SQLITE_INTERRUPT;
rc = SQLITE_ERROR;
sqlite3SetString(ref p.zErrMsg, db, sqlite3ErrStr(p.rc));
}
else
{
string z;
Op pOp;
if (i < p.nOp)
{
/* The output line number is small enough that we are still in the
** main program. */
pOp = p.aOp[i];
}
else
{
/* We are currently listing subprograms. Figure out which one and
** pick up the appropriate opcode. */
int j;
i -= p.nOp;
for (j = 0; i >= apSub[j].nOp; j++)
{
i -= apSub[j].nOp;
}
pOp = apSub[j].aOp[i];
}
if (p.explain == 1)
{
pMem.flags = MEM_Int;
pMem.type = SQLITE_INTEGER;
pMem.u.i = i; /* Program counter */
if (p.pResultSet[i_pMem] == null)
{
p.pResultSet[i_pMem] = sqlite3Malloc(p.pResultSet[i_pMem]);
}
pMem = p.pResultSet[i_pMem++]; //pMem++;
/* When an OP_Program opcode is encounter (the only opcode that has
** a P4_SUBPROGRAM argument), expand the size of the array of subprograms
** kept in p->aMem[9].z to hold the new program - assuming this subprogram
** has not already been seen.
*/
pMem.flags = MEM_Static | MEM_Str | MEM_Term;
pMem.z = sqlite3OpcodeName(pOp.opcode); /* Opcode */
Debug.Assert(pMem.z != null);
pMem.n = sqlite3Strlen30(pMem.z);
pMem.type = SQLITE_TEXT;
pMem.enc = SQLITE_UTF8;
if (p.pResultSet[i_pMem] == null)
{
p.pResultSet[i_pMem] = sqlite3Malloc(p.pResultSet[i_pMem]);
}
pMem = p.pResultSet[i_pMem++]; //pMem++;
if (pOp.p4type == P4_SUBPROGRAM)
{
//Debugger.Break(); // TODO
//int nByte = 0;//(nSub+1)*sizeof(SubProgram);
int j;
for (j = 0; j < nSub; j++)
{
if (apSub[j] == pOp.p4.pProgram)
break;
}
if (j == nSub)
{// && SQLITE_OK==sqlite3VdbeMemGrow(pSub, nByte, 1) ){
Array.Resize(ref apSub, nSub + 1);
pSub._SubProgram = apSub;// (SubProgram)pSub.z;
apSub[nSub++] = pOp.p4.pProgram;
pSub.flags |= MEM_Blob;
pSub.n = 0;//nSub*sizeof(SubProgram);
}
}
}
pMem.flags = MEM_Int;
pMem.u.i = pOp.p1; /* P1 */
pMem.type = SQLITE_INTEGER;
if (p.pResultSet[i_pMem] == null)
{
p.pResultSet[i_pMem] = sqlite3Malloc(p.pResultSet[i_pMem]);
}
pMem = p.pResultSet[i_pMem++]; //pMem++;
pMem.flags = MEM_Int;
pMem.u.i = pOp.p2; /* P2 */
pMem.type = SQLITE_INTEGER;
if (p.pResultSet[i_pMem] == null)
{
p.pResultSet[i_pMem] = sqlite3Malloc(p.pResultSet[i_pMem]);
}
pMem = p.pResultSet[i_pMem++]; //pMem++;
pMem.flags = MEM_Int;
pMem.u.i = pOp.p3; /* P3 */
pMem.type = SQLITE_INTEGER;
if (p.pResultSet[i_pMem] == null)
{
p.pResultSet[i_pMem] = sqlite3Malloc(p.pResultSet[i_pMem]);
}
pMem = p.pResultSet[i_pMem++]; //pMem++;
//if ( sqlite3VdbeMemGrow( pMem, 32, 0 ) != 0 )
//{ /* P4 */
// Debug.Assert( p.db.mallocFailed != 0 );
// return SQLITE_ERROR;
//}
pMem.flags = MEM_Dyn | MEM_Str | MEM_Term;
z = displayP4(pOp, pMem.z, 32);
if (z != pMem.z)
{
sqlite3VdbeMemSetStr(pMem, z, -1, SQLITE_UTF8, null);
}
else
{
Debug.Assert(pMem.z != null);
pMem.n = sqlite3Strlen30(pMem.z);
pMem.enc = SQLITE_UTF8;
}
pMem.type = SQLITE_TEXT;
if (p.pResultSet[i_pMem] == null)
{
p.pResultSet[i_pMem] = sqlite3Malloc(p.pResultSet[i_pMem]);
}
pMem = p.pResultSet[i_pMem++]; //pMem++;
if (p.explain == 1)
{
//if ( sqlite3VdbeMemGrow( pMem, 4, 0 ) != 0 )
//{
// Debug.Assert( p.db.mallocFailed != 0 );
// return SQLITE_ERROR;
//}
pMem.flags = MEM_Dyn | MEM_Str | MEM_Term;
pMem.n = 2;
pMem.z = pOp.p5.ToString("x2"); //sqlite3_snprintf( 3, pMem.z, "%.2x", pOp.p5 ); /* P5 */
pMem.type = SQLITE_TEXT;
pMem.enc = SQLITE_UTF8;
if (p.pResultSet[i_pMem] == null)
{
p.pResultSet[i_pMem] = sqlite3Malloc(p.pResultSet[i_pMem]);
}
pMem = p.pResultSet[i_pMem++]; // pMem++;
#if SQLITE_DEBUG
if (pOp.zComment != null)
{
pMem.flags = MEM_Str | MEM_Term;
pMem.z = pOp.zComment;
pMem.n = pMem.z == null ? 0 : sqlite3Strlen30(pMem.z);
pMem.enc = SQLITE_UTF8;
pMem.type = SQLITE_TEXT;
}
else
#endif
{
pMem.flags = MEM_Null; /* Comment */
pMem.type = SQLITE_NULL;
}
}
p.nResColumn = (u16)(8 - 4 * (p.explain - 1));
p.rc = SQLITE_OK;
rc = SQLITE_ROW;
}
return rc;
}
#endif // * SQLITE_OMIT_EXPLAIN */
#if SQLITE_DEBUG
/*
** Print the SQL that was used to generate a VDBE program.
*/
private static void sqlite3VdbePrintSql(Vdbe p)
{
int nOp = p.nOp;
VdbeOp pOp;
if (nOp < 1)
return;
pOp = p.aOp[0];
if (pOp.opcode == OP_Trace && pOp.p4.z != null)
{
string z = pOp.p4.z;
z = z.Trim();// while ( sqlite3Isspace( *(u8)z ) ) z++;
Console.Write("SQL: [%s]\n", z);
}
}
#endif
#if !SQLITE_OMIT_TRACE && SQLITE_ENABLE_IOTRACE
/*
** Print an IOTRACE message showing SQL content.
*/
static void sqlite3VdbeIOTraceSql( Vdbe p )
{
int nOp = p.nOp;
VdbeOp pOp;
if ( SQLite3IoTrace == false ) return;
if ( nOp < 1 ) return;
pOp = p.aOp[0];
if ( pOp.opcode == OP_Trace && pOp.p4.z != null )
{
int i, j;
string z = "";//char z[1000];
sqlite3_snprintf( 1000, z, "%s", pOp.p4.z );
//for(i=0; sqlite3Isspace(z[i]); i++){}
//for(j=0; z[i]; i++){
//if( sqlite3Isspace(z[i]) ){
//if( z[i-1]!=' ' ){
//z[j++] = ' ';
//}
//}else{
//z[j++] = z[i];
//}
//}
//z[j] = 0;
//z = z.Trim( z );
sqlite3IoTrace( "SQL %s\n", z.Trim() );
}
}
#endif // * !SQLITE_OMIT_TRACE && SQLITE_ENABLE_IOTRACE */
/*
** Allocate space from a fixed size buffer and return a pointer to
** that space. If insufficient space is available, return NULL.
**
** The pBuf parameter is the initial value of a pointer which will
** receive the new memory. pBuf is normally NULL. If pBuf is not
** NULL, it means that memory space has already been allocated and that
** this routine should not allocate any new memory. When pBuf is not
** NULL simply return pBuf. Only allocate new memory space when pBuf
** is NULL.
**
** nByte is the number of bytes of space needed.
**
** *ppFrom points to available space and pEnd points to the end of the
** available space. When space is allocated, *ppFrom is advanced past
** the end of the allocated space.
**
** *pnByte is a counter of the number of bytes of space that have failed
** to allocate. If there is insufficient space in *ppFrom to satisfy the
** request, then increment *pnByte by the amount of the request.
*/
//static void* allocSpace(
// void* pBuf, /* Where return pointer will be stored */
// int nByte, /* Number of bytes to allocate */
// u8** ppFrom, /* IN/OUT: Allocate from *ppFrom */
// u8* pEnd, /* Pointer to 1 byte past the end of *ppFrom buffer */
// int* pnByte /* If allocation cannot be made, increment *pnByte */
//)
//{
// Debug.Assert(EIGHT_BYTE_ALIGNMENT(*ppFrom));
// if (pBuf) return pBuf;
// nByte = ROUND8(nByte);
// if (&(*ppFrom)[nByte] <= pEnd)
// {
// pBuf = (void)*ppFrom;
// *ppFrom += nByte;
// }
// else
// {
// *pnByte += nByte;
// }
// return pBuf;
//}
/*
** Rewind the VDBE back to the beginning in preparation for
** running it.
*/
private static void sqlite3VdbeRewind(Vdbe p)
{
#if (SQLITE_DEBUG) || (VDBE_PROFILE)
int i;
#endif
Debug.Assert(p != null);
Debug.Assert(p.magic == VDBE_MAGIC_INIT);
/* There should be at least one opcode.
*/
Debug.Assert(p.nOp > 0);
/* Set the magic to VDBE_MAGIC_RUN sooner rather than later. */
p.magic = VDBE_MAGIC_RUN;
#if SQLITE_DEBUG
for (i = 1; i < p.nMem; i++)
{
Debug.Assert(p.aMem[i].db == p.db);
}
#endif
p.pc = -1;
p.rc = SQLITE_OK;
p.errorAction = OE_Abort;
p.magic = VDBE_MAGIC_RUN;
p.nChange = 0;
p.cacheCtr = 1;
p.minWriteFileFormat = 255;
p.iStatement = 0;
p.nFkConstraint = 0;
#if VDBE_PROFILE
for(i=0; iaOp[p->nOp]; /* Memory avaliable for allocation */
//zEnd = (u8)&p->aOp[p->nOpAlloc]; /* First byte past end of zCsr[] */
resolveP2Values(p, ref nArg);
p.usesStmtJournal = (pParse.isMultiWrite != 0 && pParse.mayAbort != 0);
if (pParse.explain != 0 && nMem < 10)
{
nMem = 10;
}
//memset(zCsr, 0, zEnd-zCsr);
//zCsr += ( zCsr - (u8)0 ) & 7;
//Debug.Assert( EIGHT_BYTE_ALIGNMENT( zCsr ) );
p.expired = false;
//
// C# -- Replace allocation with individual Dims
//
/* Memory for registers, parameters, cursor, etc, is allocated in two
** passes. On the first pass, we try to reuse unused space at the
** end of the opcode array. If we are unable to satisfy all memory
** requirements by reusing the opcode array tail, then the second
** pass will fill in the rest using a fresh allocation.
**
** This two-pass approach that reuses as much memory as possible from
** the leftover space at the end of the opcode array can significantly
** reduce the amount of memory held by a prepared statement.
*/
//do
//{
// nByte = 0;
// p->aMem = allocSpace( p->aMem, nMem * sizeof( Mem ), &zCsr, zEnd, &nByte );
// p->aVar = allocSpace( p->aVar, nVar * sizeof( Mem ), &zCsr, zEnd, &nByte );
// p->apArg = allocSpace( p->apArg, nArg * sizeof( Mem* ), &zCsr, zEnd, &nByte );
// p->azVar = allocSpace( p->azVar, nVar * sizeof( char* ), &zCsr, zEnd, &nByte );
// p->apCsr = allocSpace( p->apCsr, nCursor * sizeof( VdbeCursor* ),
// &zCsr, zEnd, &nByte );
// if ( nByte )
// {
// p->pFree = sqlite3DbMallocZero( db, nByte );
// }
// zCsr = p->pFree;
// zEnd = zCsr[nByte];
//} while ( nByte && !db->mallocFailed );
//p->nCursor = (u16)nCursor;
//if( p->aVar ){
// p->nVar = (ynVar)nVar;
// for(n=0; naVar[n].flags = MEM_Null;
// p->aVar[n].db = db;
// }
//}
//if( p->azVar ){
// p->nzVar = pParse->nzVar;
// memcpy(p->azVar, pParse->azVar, p->nzVar*sizeof(p->azVar[0]));
// memset(pParse->azVar, 0, pParse->nzVar*sizeof(pParse->azVar[0]));
//}
p.nzVar = (i16)pParse.nzVar;
p.azVar = new string[(int)p.nzVar == 0 ? 1 : (int)p.nzVar]; //p.azVar = (char*)p.apArg[nArg];
for (n = 0; n < p.nzVar; n++)
{
p.azVar[n] = pParse.azVar[n];
}
//
// C# -- Replace allocation with individual Dims
// aMem is 1 based, so allocate 1 extra cell under C#
p.aMem = new Mem[nMem + 1];
for (n = 0; n <= nMem; n++)
{
p.aMem[n] = sqlite3Malloc(p.aMem[n]);
p.aMem[n].db = db;
}
//p.aMem--; /* aMem[] goes from 1..nMem */
p.nMem = nMem; /* not from 0..nMem-1 */
//
p.aVar = new Mem[nVar == 0 ? 1 : nVar];
for (n = 0; n < nVar; n++)
{
p.aVar[n] = sqlite3Malloc(p.aVar[n]);
}
p.nVar = (ynVar)nVar;
//
p.apArg = new Mem[nArg == 0 ? 1 : nArg];//p.apArg = (Mem*)p.aVar[nVar];
//
p.apCsr = new VdbeCursor[nCursor == 0 ? 1 : nCursor];//p.apCsr = (VdbeCursor*)p.azVar[nVar];
p.apCsr[0] = new VdbeCursor();
p.nCursor = (u16)nCursor;
if (p.aVar != null)
{
p.nVar = (ynVar)nVar;
//
for (n = 0; n < nVar; n++)
{
p.aVar[n].flags = MEM_Null;
p.aVar[n].db = db;
}
}
if (p.aMem != null)
{
//p.aMem--; /* aMem[] goes from 1..nMem */
p.nMem = nMem; /* not from 0..nMem-1 */
for (n = 0; n <= nMem; n++)
{
p.aMem[n].flags = MEM_Null;
p.aMem[n].n = 0;
p.aMem[n].z = null;
p.aMem[n].zBLOB = null;
p.aMem[n].db = db;
}
}
p.explain = pParse.explain;
sqlite3VdbeRewind(p);
}
/*
** Close a VDBE cursor and release all the resources that cursor
** happens to hold.
*/
private static void sqlite3VdbeFreeCursor(Vdbe p, VdbeCursor pCx)
{
if (pCx == null)
{
return;
}
if (pCx.pBt != null)
{
sqlite3BtreeClose(ref pCx.pBt);
/* The pCx.pCursor will be close automatically, if it exists, by
** the call above. */
}
else if (pCx.pCursor != null)
{
sqlite3BtreeCloseCursor(pCx.pCursor);
}
#if !SQLITE_OMIT_VIRTUALTABLE
if (pCx.pVtabCursor != null)
{
sqlite3_vtab_cursor pVtabCursor = pCx.pVtabCursor;
sqlite3_module pModule = pCx.pModule;
p.inVtabMethod = 1;
pModule.xClose(ref pVtabCursor);
p.inVtabMethod = 0;
}
#endif
}
/*
** Copy the values stored in the VdbeFrame structure to its Vdbe. This
** is used, for example, when a trigger sub-program is halted to restore
** control to the main program.
*/
private static int sqlite3VdbeFrameRestore(VdbeFrame pFrame)
{
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
** cell array. This is necessary as the memory cell array may contain
** pointers to VdbeFrame objects, which may in turn contain pointers to
** open cursors.
*/
private static void closeAllCursors(Vdbe p)
{
if (p.pFrame != null)
{
VdbeFrame pFrame;
for (pFrame = p.pFrame; pFrame.pParent != null; pFrame = pFrame.pParent)
;
sqlite3VdbeFrameRestore(pFrame);
}
p.pFrame = null;
p.nFrame = 0;
if (p.apCsr != null)
{
int i;
for (i = 0; i < p.nCursor; i++)
{
VdbeCursor pC = p.apCsr[i];
if (pC != null)
{
sqlite3VdbeFreeCursor(p, pC);
p.apCsr[i] = null;
}
}
}
if (p.aMem != null)
{
releaseMemArray(p.aMem, 1, p.nMem);
}
while (p.pDelFrame != null)
{
VdbeFrame pDel = p.pDelFrame;
p.pDelFrame = pDel.pParent;
sqlite3VdbeFrameDelete(pDel);
}
}
/*
** Clean up the VM after execution.
**
** 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.
*/
private static void Cleanup(Vdbe p)
{
sqlite3 db = p.db;
#if SQLITE_DEBUG
/* Execute Debug.Assert() statements to ensure that the Vdbe.apCsr[] and
** Vdbe.aMem[] arrays have already been cleaned up. */
int i;
//TODO for(i=0; i 0)
{
p.aColName[n] = sqlite3Malloc(p.aColName[n]);
pColName = p.aColName[n];
pColName.flags = MEM_Null;
pColName.db = p.db;
}
}
/*
** Set the name of the idx'th column to be returned by the SQL statement.
** zName must be a pointer to a nul terminated string.
**
** This call must be made after a call to sqlite3VdbeSetNumCols().
**
** The final parameter, xDel, must be one of SQLITE_DYNAMIC, SQLITE_STATIC
** or SQLITE_TRANSIENT. If it is SQLITE_DYNAMIC, then the buffer pointed
** to by zName will be freed by sqlite3DbFree() when the vdbe is destroyed.
*/
private static int sqlite3VdbeSetColName(
Vdbe p, /* Vdbe being configured */
int idx, /* Index of column zName applies to */
int var, /* One of the COLNAME_* constants */
string zName, /* Pointer to buffer containing name */
dxDel xDel /* Memory management strategy for zName */
)
{
int rc;
Mem pColName;
Debug.Assert(idx < p.nResColumn);
Debug.Assert(var < COLNAME_N);
//if ( p.db.mallocFailed != 0 )
//{
// Debug.Assert( null == zName || xDel != SQLITE_DYNAMIC );
// return SQLITE_NOMEM;
//}
Debug.Assert(p.aColName != null);
pColName = p.aColName[idx + var * p.nResColumn];
rc = sqlite3VdbeMemSetStr(pColName, zName, -1, SQLITE_UTF8, xDel);
Debug.Assert(rc != 0 || null == zName || (pColName.flags & MEM_Term) != 0);
return rc;
}
/*
** A read or write transaction may or may not be active on database handle
** db. If a transaction is active, commit it. If there is a
** write-transaction spanning more than one database file, this routine
** takes care of the master journal trickery.
*/
private static int vdbeCommit(sqlite3 db, Vdbe p)
{
int i;
int nTrans = 0; /* Number of databases with an active write-transaction */
int rc = SQLITE_OK;
bool needXcommit = false;
#if SQLITE_OMIT_VIRTUALTABLE
/* With this option, sqlite3VtabSync() is defined to be simply
** SQLITE_OK so p is not used.
*/
UNUSED_PARAMETER( p );
#endif
/* Before doing anything else, call the xSync() callback for any
** virtual module tables written in this transaction. This has to
** be done before determining whether a master journal file is
** required, as an xSync() callback may add an attached database
** to the transaction.
*/
rc = sqlite3VtabSync(db, ref p.zErrMsg);
/* This loop determines (a) if the commit hook should be invoked and
** (b) how many database files have open write transactions, not
** including the temp database. (b) is important because if more than
** one database file has an open write transaction, a master journal
** file is required for an atomic commit.
*/
for (i = 0; rc == SQLITE_OK && i < db.nDb; i++)
{
Btree pBt = db.aDb[i].pBt;
if (sqlite3BtreeIsInTrans(pBt))
{
needXcommit = true;
if (i != 1)
nTrans++;
rc = sqlite3PagerExclusiveLock(sqlite3BtreePager(pBt));
}
}
if (rc != SQLITE_OK)
{
return rc;
}
/* If there are any write-transactions at all, invoke the commit hook */
if (needXcommit && db.xCommitCallback != null)
{
rc = db.xCommitCallback(db.pCommitArg);
if (rc != 0)
{
return SQLITE_CONSTRAINT;
}
}
/* The simple case - no more than one database file (not counting the
** TEMP database) has a transaction active. There is no need for the
** master-journal.
**
** If the return value of sqlite3BtreeGetFilename() is a zero length
** string, it means the main database is :memory: or a temp file. In
** that case we do not support atomic multi-file commits, so use the
** simple case then too.
*/
if (0 == sqlite3Strlen30(sqlite3BtreeGetFilename(db.aDb[0].pBt))
|| nTrans <= 1)
{
for (i = 0; rc == SQLITE_OK && i < db.nDb; i++)
{
Btree pBt = db.aDb[i].pBt;
if (pBt != null)
{
rc = sqlite3BtreeCommitPhaseOne(pBt, null);
}
}
/* Do the commit only if all databases successfully complete phase 1.
** If one of the BtreeCommitPhaseOne() calls fails, this indicates an
** IO error while deleting or truncating a journal file. It is unlikely,
** but could happen. In this case abandon processing and return the error.
*/
for (i = 0; rc == SQLITE_OK && i < db.nDb; i++)
{
Btree pBt = db.aDb[i].pBt;
if (pBt != null)
{
rc = sqlite3BtreeCommitPhaseTwo(pBt, 0);
}
}
if (rc == SQLITE_OK)
{
sqlite3VtabCommit(db);
}
}
/* The complex case - There is a multi-file write-transaction active.
** This requires a master journal file to ensure the transaction is
** committed atomicly.
*/
#if !SQLITE_OMIT_DISKIO
else
{
sqlite3_vfs pVfs = db.pVfs;
bool needSync = false;
string zMaster = ""; /* File-name for the master journal */
string zMainFile = sqlite3BtreeGetFilename(db.aDb[0].pBt);
sqlite3_file pMaster = null;
i64 offset = 0;
int res = 0;
/* Select a master journal file name */
do
{
i64 iRandom = 0;
sqlite3DbFree(db, ref zMaster);
sqlite3_randomness(sizeof(u32), ref iRandom);//random.Length
zMaster = sqlite3MPrintf(db, "%s-mj%08X", zMainFile, iRandom & 0x7fffffff);
//if (!zMaster)
//{
// return SQLITE_NOMEM;
//}
sqlite3FileSuffix3(zMainFile, zMaster);
rc = sqlite3OsAccess(pVfs, zMaster, SQLITE_ACCESS_EXISTS, ref res);
} while (rc == SQLITE_OK && res == 1);
if (rc == SQLITE_OK)
{
/* Open the master journal. */
rc = sqlite3OsOpenMalloc(ref pVfs, zMaster, ref pMaster,
SQLITE_OPEN_READWRITE | SQLITE_OPEN_CREATE |
SQLITE_OPEN_EXCLUSIVE | SQLITE_OPEN_MASTER_JOURNAL, ref rc
);
}
if (rc != SQLITE_OK)
{
sqlite3DbFree(db, ref zMaster);
return rc;
}
/* Write the name of each database file in the transaction into the new
** master journal file. If an error occurs at this point close
** and delete the master journal file. All the individual journal files
** still have 'null' as the master journal pointer, so they will roll
** back independently if a failure occurs.
*/
for (i = 0; i < db.nDb; i++)
{
Btree pBt = db.aDb[i].pBt;
if (sqlite3BtreeIsInTrans(pBt))
{
string zFile = sqlite3BtreeGetJournalname(pBt);
if (zFile == null)
{
continue; /* Ignore TEMP and :memory: databases */
}
Debug.Assert(zFile != "");
if (!needSync && 0 == sqlite3BtreeSyncDisabled(pBt))
{
needSync = true;
}
rc = sqlite3OsWrite(pMaster, Encoding.UTF8.GetBytes(zFile), sqlite3Strlen30(zFile), offset);
offset += sqlite3Strlen30(zFile);
if (rc != SQLITE_OK)
{
sqlite3OsCloseFree(pMaster);
sqlite3OsDelete(pVfs, zMaster, 0);
sqlite3DbFree(db, ref zMaster);
return rc;
}
}
}
/* Sync the master journal file. If the IOCAP_SEQUENTIAL device
** flag is set this is not required.
*/
if (needSync
&& 0 == (sqlite3OsDeviceCharacteristics(pMaster) & SQLITE_IOCAP_SEQUENTIAL)
&& SQLITE_OK != (rc = sqlite3OsSync(pMaster, SQLITE_SYNC_NORMAL))
)
{
sqlite3OsCloseFree(pMaster);
sqlite3OsDelete(pVfs, zMaster, 0);
sqlite3DbFree(db, ref zMaster);
return rc;
}
/* Sync all the db files involved in the transaction. The same call
** sets the master journal pointer in each individual journal. If
** an error occurs here, do not delete the master journal file.
**
** If the error occurs during the first call to
** sqlite3BtreeCommitPhaseOne(), then there is a chance that the
** master journal file will be orphaned. But we cannot delete it,
** in case the master journal file name was written into the journal
** file before the failure occurred.
*/
for (i = 0; rc == SQLITE_OK && i < db.nDb; i++)
{
Btree pBt = db.aDb[i].pBt;
if (pBt != null)
{
rc = sqlite3BtreeCommitPhaseOne(pBt, zMaster);
}
}
sqlite3OsCloseFree(pMaster);
Debug.Assert(rc != SQLITE_BUSY);
if (rc != SQLITE_OK)
{
sqlite3DbFree(db, ref zMaster);
return rc;
}
/* Delete the master journal file. This commits the transaction. After
** doing this the directory is synced again before any individual
** transaction files are deleted.
*/
rc = sqlite3OsDelete(pVfs, zMaster, 1);
sqlite3DbFree(db, ref zMaster);
if (rc != 0)
{
return rc;
}
/* All files and directories have already been synced, so the following
** calls to sqlite3BtreeCommitPhaseTwo() are only closing files and
** deleting or truncating journals. If something goes wrong while
** this is happening we don't really care. The integrity of the
** transaction is already guaranteed, but some stray 'cold' journals
** may be lying around. Returning an error code won't help matters.
*/
#if SQLITE_TEST
disable_simulated_io_errors();
#endif
sqlite3BeginBenignMalloc();
for (i = 0; i < db.nDb; i++)
{
Btree pBt = db.aDb[i].pBt;
if (pBt != null)
{
sqlite3BtreeCommitPhaseTwo(pBt, 0);
}
}
sqlite3EndBenignMalloc();
#if SQLITE_TEST
enable_simulated_io_errors();
#endif
sqlite3VtabCommit(db);
}
#endif
return rc;
}
/*
** This routine checks that the sqlite3.activeVdbeCnt count variable
** matches the number of vdbe's in the list sqlite3.pVdbe that are
** currently active. An Debug.Assertion fails if the two counts do not match.
** This is an internal self-check only - it is not an essential processing
** step.
**
** This is a no-op if NDEBUG is defined.
*/
#if !NDEBUG
private static void checkActiveVdbeCnt(sqlite3 db)
{
Vdbe p;
int cnt = 0;
int nWrite = 0;
p = db.pVdbe;
while (p != null)
{
if (p.magic == VDBE_MAGIC_RUN && p.pc >= 0)
{
cnt++;
if (p.readOnly == false)
nWrite++;
}
p = p.pNext;
}
Debug.Assert(cnt == db.activeVdbeCnt);
Debug.Assert(nWrite == db.writeVdbeCnt);
}
#else
//#define checkActiveVdbeCnt(x)
static void checkActiveVdbeCnt( sqlite3 db ){}
#endif
/*
** For every Btree that in database connection db which
** has been modified, "trip" or invalidate each cursor in
** that Btree might have been modified so that the cursor
** can never be used again. This happens when a rollback
*** occurs. We have to trip all the other cursors, even
** cursor from other VMs in different database connections,
** so that none of them try to use the data at which they
** were pointing and which now may have been changed due
** to the rollback.
**
** Remember that a rollback can delete tables complete and
** reorder rootpages. So it is not sufficient just to save
** the state of the cursor. We have to invalidate the cursor
** so that it is never used again.
*/
private static void invalidateCursorsOnModifiedBtrees(sqlite3 db)
{
int i;
for (i = 0; i < db.nDb; i++)
{
Btree p = db.aDb[i].pBt;
if (p != null && sqlite3BtreeIsInTrans(p))
{
sqlite3BtreeTripAllCursors(p, SQLITE_ABORT);
}
}
}
/*
** If the Vdbe passed as the first argument opened a statement-transaction,
** close it now. Argument eOp must be either SAVEPOINT_ROLLBACK or
** SAVEPOINT_RELEASE. If it is SAVEPOINT_ROLLBACK, then the statement
** transaction is rolled back. If eOp is SAVEPOINT_RELEASE, then the
** statement transaction is commtted.
**
** If an IO error occurs, an SQLITE_IOERR_XXX error code is returned.
** Otherwise SQLITE_OK.
*/
private static int sqlite3VdbeCloseStatement(Vdbe p, int eOp)
{
sqlite3 db = p.db;
int rc = SQLITE_OK;
/* If p->iStatement is greater than zero, then this Vdbe opened a
** statement transaction that should be closed here. The only exception
** is that an IO error may have occured, causing an emergency rollback.
** In this case (db->nStatement==0), and there is nothing to do.
*/
if (db.nStatement != 0 && p.iStatement != 0)
{
int i;
int iSavepoint = p.iStatement - 1;
Debug.Assert(eOp == SAVEPOINT_ROLLBACK || eOp == SAVEPOINT_RELEASE);
Debug.Assert(db.nStatement > 0);
Debug.Assert(p.iStatement == (db.nStatement + db.nSavepoint));
for (i = 0; i < db.nDb; i++)
{
int rc2 = SQLITE_OK;
Btree pBt = db.aDb[i].pBt;
if (pBt != null)
{
if (eOp == SAVEPOINT_ROLLBACK)
{
rc2 = sqlite3BtreeSavepoint(pBt, SAVEPOINT_ROLLBACK, iSavepoint);
}
if (rc2 == SQLITE_OK)
{
rc2 = sqlite3BtreeSavepoint(pBt, SAVEPOINT_RELEASE, iSavepoint);
}
if (rc == SQLITE_OK)
{
rc = rc2;
}
}
}
db.nStatement--;
p.iStatement = 0;
if (rc == SQLITE_OK)
{
if (eOp == SAVEPOINT_ROLLBACK)
{
rc = sqlite3VtabSavepoint(db, SAVEPOINT_ROLLBACK, iSavepoint);
}
if (rc == SQLITE_OK)
{
rc = sqlite3VtabSavepoint(db, SAVEPOINT_RELEASE, iSavepoint);
}
}
/* If the statement transaction is being rolled back, also restore the
** database handles deferred constraint counter to the value it had when
** the statement transaction was opened. */
if (eOp == SAVEPOINT_ROLLBACK)
{
db.nDeferredCons = p.nStmtDefCons;
}
}
return rc;
}
/*
** This function is called when a transaction opened by the database
** handle associated with the VM passed as an argument is about to be
** committed. If there are outstanding deferred foreign key constraint
** violations, return SQLITE_ERROR. Otherwise, SQLITE_OK.
**
** If there are outstanding FK violations and this function returns
** SQLITE_ERROR, set the result of the VM to SQLITE_CONSTRAINT and write
** an error message to it. Then return SQLITE_ERROR.
*/
#if !SQLITE_OMIT_FOREIGN_KEY
private static int sqlite3VdbeCheckFk(Vdbe p, int deferred)
{
sqlite3 db = p.db;
if ((deferred != 0 && db.nDeferredCons > 0) || (0 == deferred && p.nFkConstraint > 0))
{
p.rc = SQLITE_CONSTRAINT;
p.errorAction = OE_Abort;
sqlite3SetString(ref p.zErrMsg, db, "foreign key constraint failed");
return SQLITE_ERROR;
}
return SQLITE_OK;
}
#endif
/*
** This routine is called the when a VDBE tries to halt. If the VDBE
** has made changes and is in autocommit mode, then commit those
** changes. If a rollback is needed, then do the rollback.
**
** This routine is the only way to move the state of a VM from
** SQLITE_MAGIC_RUN to SQLITE_MAGIC_HALT. It is harmless to
** call this on a VM that is in the SQLITE_MAGIC_HALT state.
**
** Return an error code. If the commit could not complete because of
** lock contention, return SQLITE_BUSY. If SQLITE_BUSY is returned, it
** means the close did not happen and needs to be repeated.
*/
private static int sqlite3VdbeHalt(Vdbe p)
{
int rc; /* Used to store transient return codes */
sqlite3 db = p.db;
/* This function contains the logic that determines if a statement or
** transaction will be committed or rolled back as a result of the
** execution of this virtual machine.
**
** If any of the following errors occur:
**
** SQLITE_NOMEM
** SQLITE_IOERR
** SQLITE_FULL
** SQLITE_INTERRUPT
**
** Then the internal cache might have been left in an inconsistent
** state. We need to rollback the statement transaction, if there is
** one, or the complete transaction if there is no statement transaction.
*/
//if ( p.db.mallocFailed != 0 )
//{
// p.rc = SQLITE_NOMEM;
//}
closeAllCursors(p);
if (p.magic != VDBE_MAGIC_RUN)
{
return SQLITE_OK;
}
checkActiveVdbeCnt(db);
/* No commit or rollback needed if the program never started */
if (p.pc >= 0)
{
int mrc; /* Primary error code from p.rc */
int eStatementOp = 0;
bool isSpecialError = false; /* Set to true if a 'special' error */
/* Lock all btrees used by the statement */
sqlite3VdbeEnter(p);
/* Check for one of the special errors */
mrc = p.rc & 0xff;
Debug.Assert(p.rc != SQLITE_IOERR_BLOCKED); /* This error no longer exists */
isSpecialError = mrc == SQLITE_NOMEM || mrc == SQLITE_IOERR
|| mrc == SQLITE_INTERRUPT || mrc == SQLITE_FULL;
if (isSpecialError)
{
/* If the query was read-only and the error code is SQLITE_INTERRUPT,
** no rollback is necessary. Otherwise, at least a savepoint
** transaction must be rolled back to restore the database to a
** consistent state.
**
** Even if the statement is read-only, it is important to perform
** a statement or transaction rollback operation. If the error
** occured while writing to the journal, sub-journal or database
** file as part of an effort to free up cache space (see function
** pagerStress() in pager.c), the rollback is required to restore
** the pager to a consistent state.
*/
if (!p.readOnly || mrc != SQLITE_INTERRUPT)
{
if ((mrc == SQLITE_NOMEM || mrc == SQLITE_FULL) && p.usesStmtJournal)
{
eStatementOp = SAVEPOINT_ROLLBACK;
}
else
{
/* We are forced to roll back the active transaction. Before doing
** so, abort any other statements this handle currently has active.
*/
invalidateCursorsOnModifiedBtrees(db);
sqlite3RollbackAll(db);
sqlite3CloseSavepoints(db);
db.autoCommit = 1;
}
}
}
/* Check for immediate foreign key violations. */
if (p.rc == SQLITE_OK)
{
sqlite3VdbeCheckFk(p, 0);
}
/* If the auto-commit flag is set and this is the only active writer
** VM, then we do either a commit or rollback of the current transaction.
**
** Note: This block also runs if one of the special errors handled
** above has occurred.
*/
if (!sqlite3VtabInSync(db)
&& db.autoCommit != 0
&& db.writeVdbeCnt == ((p.readOnly == false) ? 1 : 0)
)
{
if (p.rc == SQLITE_OK || (p.errorAction == OE_Fail && !isSpecialError))
{
rc = sqlite3VdbeCheckFk(p, 1);
if (rc != SQLITE_OK)
{
if (NEVER(p.readOnly))
{
sqlite3VdbeLeave(p);
return SQLITE_ERROR;
}
rc = SQLITE_CONSTRAINT;
}
else
{
/* The auto-commit flag is true, the vdbe program was successful
** or hit an 'OR FAIL' constraint and there are no deferred foreign
** key constraints to hold up the transaction. This means a commit
** is required. */
rc = vdbeCommit(db, p);
}
if (rc == SQLITE_BUSY && p.readOnly)
{
sqlite3VdbeLeave(p);
return SQLITE_BUSY;
}
else if (rc != SQLITE_OK)
{
p.rc = rc;
sqlite3RollbackAll(db);
}
else
{
db.nDeferredCons = 0;
sqlite3CommitInternalChanges(db);
}
}
else
{
sqlite3RollbackAll(db);
}
db.nStatement = 0;
}
else if (eStatementOp == 0)
{
if (p.rc == SQLITE_OK || p.errorAction == OE_Fail)
{
eStatementOp = SAVEPOINT_RELEASE;
}
else if (p.errorAction == OE_Abort)
{
eStatementOp = SAVEPOINT_ROLLBACK;
}
else
{
invalidateCursorsOnModifiedBtrees(db);
sqlite3RollbackAll(db);
sqlite3CloseSavepoints(db);
db.autoCommit = 1;
}
}
/* If eStatementOp is non-zero, then a statement transaction needs to
** be committed or rolled back. Call sqlite3VdbeCloseStatement() to
** do so. If this operation returns an error, and the current statement
** error code is SQLITE_OK or SQLITE_CONSTRAINT, then promote the
** current statement error code.
*/
if (eStatementOp != 0)
{
rc = sqlite3VdbeCloseStatement(p, eStatementOp);
if (rc != 0)
{
if (p.rc == SQLITE_OK || p.rc == SQLITE_CONSTRAINT)
{
p.rc = rc;
sqlite3DbFree(db, ref p.zErrMsg);
p.zErrMsg = null;
}
invalidateCursorsOnModifiedBtrees(db);
sqlite3RollbackAll(db);
sqlite3CloseSavepoints(db);
db.autoCommit = 1;
}
}
/* If this was an INSERT, UPDATE or DELETE and no statement transaction
** has been rolled back, update the database connection change-counter.
*/
if (p.changeCntOn)
{
if (eStatementOp != SAVEPOINT_ROLLBACK)
{
sqlite3VdbeSetChanges(db, p.nChange);
}
else
{
sqlite3VdbeSetChanges(db, 0);
}
p.nChange = 0;
}
/* Rollback or commit any schema changes that occurred. */
if (p.rc != SQLITE_OK && (db.flags & SQLITE_InternChanges) != 0)
{
sqlite3ResetInternalSchema(db, -1);
db.flags = (db.flags | SQLITE_InternChanges);
}
/* Release the locks */
sqlite3VdbeLeave(p);
}
/* We have successfully halted and closed the VM. Record this fact. */
if (p.pc >= 0)
{
db.activeVdbeCnt--;
if (!p.readOnly)
{
db.writeVdbeCnt--;
}
Debug.Assert(db.activeVdbeCnt >= db.writeVdbeCnt);
}
p.magic = VDBE_MAGIC_HALT;
checkActiveVdbeCnt(db);
//if ( p.db.mallocFailed != 0 )
//{
// p.rc = SQLITE_NOMEM;
//}
/* If the auto-commit flag is set to true, then any locks that were held
** by connection db have now been released. Call sqlite3ConnectionUnlocked()
** to invoke any required unlock-notify callbacks.
*/
if (db.autoCommit != 0)
{
sqlite3ConnectionUnlocked(db);
}
Debug.Assert(db.activeVdbeCnt > 0 || db.autoCommit == 0 || db.nStatement == 0);
return (p.rc == SQLITE_BUSY ? SQLITE_BUSY : SQLITE_OK);
}
/*
** Each VDBE holds the result of the most recent sqlite3_step() call
** in p.rc. This routine sets that result back to SQLITE_OK.
*/
private static void sqlite3VdbeResetStepResult(Vdbe p)
{
p.rc = SQLITE_OK;
}
/*
** Clean up a VDBE after execution but do not delete the VDBE just yet.
** Write any error messages into pzErrMsg. Return the result code.
**
** After this routine is run, the VDBE should be ready to be executed
** again.
**
** To look at it another way, this routine resets the state of the
** virtual machine from VDBE_MAGIC_RUN or VDBE_MAGIC_HALT back to
** VDBE_MAGIC_INIT.
*/
private static int sqlite3VdbeReset(Vdbe p)
{
sqlite3 db;
db = p.db;
/* If the VM did not run to completion or if it encountered an
** error, then it might not have been halted properly. So halt
** it now.
*/
sqlite3VdbeHalt(p);
/* If the VDBE has be run even partially, then transfer the error code
** and error message from the VDBE into the main database structure. But
** if the VDBE has just been set to run but has not actually executed any
** instructions yet, leave the main database error information unchanged.
*/
if (p.pc >= 0)
{
//if ( p.zErrMsg != 0 ) // Always exists under C#
{
sqlite3BeginBenignMalloc();
sqlite3ValueSetStr(db.pErr, -1, p.zErrMsg == null ? "" : p.zErrMsg, SQLITE_UTF8, SQLITE_TRANSIENT);
sqlite3EndBenignMalloc();
db.errCode = p.rc;
sqlite3DbFree(db, ref p.zErrMsg);
p.zErrMsg = "";
}
//else if ( p.rc != 0 )
//{
// sqlite3Error( db, p.rc, 0 );
//}
//else
//{
// sqlite3Error( db, SQLITE_OK, 0 );
//}
if (p.runOnlyOnce != 0)
p.expired = true;
}
else if (p.rc != 0 && p.expired)
{
/* The expired flag was set on the VDBE before the first call
** to sqlite3_step(). For consistency (since sqlite3_step() was
** called), set the database error in this case as well.
*/
sqlite3Error(db, p.rc, 0);
sqlite3ValueSetStr(db.pErr, -1, p.zErrMsg, SQLITE_UTF8, SQLITE_TRANSIENT);
sqlite3DbFree(db, ref p.zErrMsg);
p.zErrMsg = "";
}
/* Reclaim all memory used by the VDBE
*/
Cleanup(p);
/* Save profiling information from this VDBE run.
*/
#if VDBE_PROFILE && TODO
{
FILE *out = fopen("vdbe_profile.out", "a");
if( out ){
int i;
fprintf(out, "---- ");
for(i=0; i0 ? p.aOp[i].cycles/p.aOp[i].cnt : 0
);
sqlite3VdbePrintOp(out, i, p.aOp[i]);
}
fclose(out);
}
}
#endif
p.magic = VDBE_MAGIC_INIT;
return p.rc & db.errMask;
}
/*
** Clean up and delete a VDBE after execution. Return an integer which is
** the result code. Write any error message text into pzErrMsg.
*/
private static int sqlite3VdbeFinalize(ref Vdbe p)
{
int rc = SQLITE_OK;
if (p.magic == VDBE_MAGIC_RUN || p.magic == VDBE_MAGIC_HALT)
{
rc = sqlite3VdbeReset(p);
Debug.Assert((rc & p.db.errMask) == rc);
}
sqlite3VdbeDelete(ref p);
return rc;
}
/*
** Call the destructor for each auxdata entry in pVdbeFunc for which
** the corresponding bit in mask is clear. Auxdata entries beyond 31
** are always destroyed. To destroy all auxdata entries, call this
** routine with mask==0.
*/
private static void sqlite3VdbeDeleteAuxData(VdbeFunc pVdbeFunc, int mask)
{
int i;
for (i = 0; i < pVdbeFunc.nAux; i++)
{
AuxData pAux = pVdbeFunc.apAux[i];
if ((i > 31 || (mask & (((u32)1) << i)) == 0 && pAux.pAux != null))
{
if (pAux.pAux != null && pAux.pAux is IDisposable)
{
(pAux.pAux as IDisposable).Dispose();
}
pAux.pAux = null;
}
}
}
/*
** Free all memory associated with the Vdbe passed as the second argument.
** The difference between this function and sqlite3VdbeDelete() is that
** VdbeDelete() also unlinks the Vdbe from the list of VMs associated with
** the database connection.
*/
private static void sqlite3VdbeDeleteObject(sqlite3 db, ref Vdbe p)
{
SubProgram pSub, pNext;
int i;
Debug.Assert(p.db == null || p.db == db);
releaseMemArray(p.aVar, p.nVar);
releaseMemArray(p.aColName, p.nResColumn, COLNAME_N);
for (pSub = p.pProgram; pSub != null; pSub = pNext)
{
pNext = pSub.pNext;
vdbeFreeOpArray(db, ref pSub.aOp, pSub.nOp);
sqlite3DbFree(db, ref pSub);
}
//for ( i = p->nzVar - 1; i >= 0; i-- )
// sqlite3DbFree( db, p.azVar[i] );
vdbeFreeOpArray(db, ref p.aOp, p.nOp);
sqlite3DbFree(db, ref p.aLabel);
sqlite3DbFree(db, ref p.aColName);
sqlite3DbFree(db, ref p.zSql);
sqlite3DbFree(db, ref p.pFree);
// Free memory allocated from db within p
//sqlite3DbFree( db, p );
}
/*
** Delete an entire VDBE.
*/
private static void sqlite3VdbeDelete(ref Vdbe p)
{
sqlite3 db;
if (NEVER(p == null))
return;
Cleanup(p);
db = p.db;
if (p.pPrev != null)
{
p.pPrev.pNext = p.pNext;
}
else
{
Debug.Assert(db.pVdbe == p);
db.pVdbe = p.pNext;
}
if (p.pNext != null)
{
p.pNext.pPrev = p.pPrev;
}
p.magic = VDBE_MAGIC_DEAD;
p.db = null;
sqlite3VdbeDeleteObject(db, ref p);
}
/*
** Make sure the cursor p is ready to read or write the row to which it
** was last positioned. Return an error code if an OOM fault or I/O error
** prevents us from positioning the cursor to its correct position.
**
** If a MoveTo operation is pending on the given cursor, then do that
** MoveTo now. If no move is pending, check to see if the row has been
** deleted out from under the cursor and if it has, mark the row as
** a NULL row.
**
** If the cursor is already pointing to the correct row and that row has
** not been deleted out from under the cursor, then this routine is a no-op.
*/
private static int sqlite3VdbeCursorMoveto(VdbeCursor p)
{
if (p.deferredMoveto)
{
int res = 0;
int rc;
#if SQLITE_TEST
//extern int sqlite3_search_count;
#endif
Debug.Assert(p.isTable);
rc = sqlite3BtreeMovetoUnpacked(p.pCursor, null, p.movetoTarget, 0, ref res);
if (rc != 0)
return rc;
p.lastRowid = p.movetoTarget;
if (res != 0)
return SQLITE_CORRUPT_BKPT();
p.rowidIsValid = true;
#if SQLITE_TEST
#if !TCLSH
sqlite3_search_count++;
#else
sqlite3_search_count.iValue++;
#endif
#endif
p.deferredMoveto = false;
p.cacheStatus = CACHE_STALE;
}
else if (ALWAYS(p.pCursor != null))
{
int hasMoved = 0;
int rc = sqlite3BtreeCursorHasMoved(p.pCursor, ref hasMoved);
if (rc != 0)
return rc;
if (hasMoved != 0)
{
p.cacheStatus = CACHE_STALE;
p.nullRow = true;
}
}
return SQLITE_OK;
}
/*
** The following functions:
**
** sqlite3VdbeSerialType()
** sqlite3VdbeSerialTypeLen()
** sqlite3VdbeSerialLen()
** sqlite3VdbeSerialPut()
** sqlite3VdbeSerialGet()
**
** encapsulate the code that serializes values for storage in SQLite
** data and index records. Each serialized value consists of a
** 'serial-type' and a blob of data. The serial type is an 8-byte unsigned
** integer, stored as a varint.
**
** In an SQLite index record, the serial type is stored directly before
** the blob of data that it corresponds to. In a table record, all serial
** types are stored at the start of the record, and the blobs of data at
** the end. Hence these functions allow the caller to handle the
** serial-type and data blob seperately.
**
** The following table describes the various storage classes for data:
**
** serial type bytes of data type
** -------------- --------------- ---------------
** 0 0 NULL
** 1 1 signed integer
** 2 2 signed integer
** 3 3 signed integer
** 4 4 signed integer
** 5 6 signed integer
** 6 8 signed integer
** 7 8 IEEE float
** 8 0 Integer constant 0
** 9 0 Integer constant 1
** 10,11 reserved for expansion
** N>=12 and even (N-12)/2 BLOB
** N>=13 and odd (N-13)/2 text
**
** The 8 and 9 types were added in 3.3.0, file format 4. Prior versions
** of SQLite will not understand those serial types.
*/
/*
** Return the serial-type for the value stored in pMem.
*/
private static u32 sqlite3VdbeSerialType(Mem pMem, int file_format)
{
int flags = pMem.flags;
int n;
if ((flags & MEM_Null) != 0)
{
return 0;
}
if ((flags & MEM_Int) != 0)
{
/* Figure out whether to use 1, 2, 4, 6 or 8 bytes. */
const i64 MAX_6BYTE = ((((i64)0x00008000) << 32) - 1);
i64 i = pMem.u.i;
u64 u;
if (file_format >= 4 && (i & 1) == i)
{
return 8 + (u32)i;
}
if (i < 0)
{
if (i < (-MAX_6BYTE))
return 6;
/* Previous test prevents: u = -(-9223372036854775808) */
u = (u64)(-i);
}
else
{
u = (u64)i;
}
if (u <= 127)
return 1;
if (u <= 32767)
return 2;
if (u <= 8388607)
return 3;
if (u <= 2147483647)
return 4;
if (u <= MAX_6BYTE)
return 5;
return 6;
}
if ((flags & MEM_Real) != 0)
{
return 7;
}
Debug.Assert( /* pMem.db.mallocFailed != 0 || */ (flags & (MEM_Str | MEM_Blob)) != 0);
n = pMem.n;
if ((flags & MEM_Zero) != 0)
{
n += pMem.u.nZero;
}
else if ((flags & MEM_Blob) != 0)
{
n = pMem.zBLOB != null ? pMem.zBLOB.Length : pMem.z != null ? pMem.z.Length : 0;
}
else
{
if (pMem.z != null)
n = Encoding.UTF8.GetByteCount(pMem.n < pMem.z.Length ? pMem.z.Substring(0, pMem.n) : pMem.z);
else
n = pMem.zBLOB.Length;
pMem.n = n;
}
Debug.Assert(n >= 0);
return (u32)((n * 2) + 12 + (((flags & MEM_Str) != 0) ? 1 : 0));
}
/*
** Return the length of the data corresponding to the supplied serial-type.
*/
private static u32[] aSize = new u32[] { 0, 1, 2, 3, 4, 6, 8, 8, 0, 0, 0, 0 };
private static u32 sqlite3VdbeSerialTypeLen(u32 serial_type)
{
if (serial_type >= 12)
{
return (u32)((serial_type - 12) / 2);
}
else
{
return aSize[serial_type];
}
}
/*
** If we are on an architecture with mixed-endian floating
** points (ex: ARM7) then swap the lower 4 bytes with the
** upper 4 bytes. Return the result.
**
** For most architectures, this is a no-op.
**
** (later): It is reported to me that the mixed-endian problem
** on ARM7 is an issue with GCC, not with the ARM7 chip. It seems
** that early versions of GCC stored the two words of a 64-bit
** float in the wrong order. And that error has been propagated
** ever since. The blame is not necessarily with GCC, though.
** GCC might have just copying the problem from a prior compiler.
** I am also told that newer versions of GCC that follow a different
** ABI get the byte order right.
**
** Developers using SQLite on an ARM7 should compile and run their
** application using -DSQLITE_DEBUG=1 at least once. With DEBUG
** enabled, some Debug.Asserts below will ensure that the byte order of
** floating point values is correct.
**
** (2007-08-30) Frank van Vugt has studied this problem closely
** and has send his findings to the SQLite developers. Frank
** writes that some Linux kernels offer floating point hardware
** emulation that uses only 32-bit mantissas instead of a full
** 48-bits as required by the IEEE standard. (This is the
** CONFIG_FPE_FASTFPE option.) On such systems, floating point
** byte swapping becomes very complicated. To avoid problems,
** the necessary byte swapping is carried out using a 64-bit integer
** rather than a 64-bit float. Frank assures us that the code here
** works for him. We, the developers, have no way to independently
** verify this, but Frank seems to know what he is talking about
** so we trust him.
*/
#if SQLITE_MIXED_ENDIAN_64BIT_FLOAT
//static u64 floatSwap(u64 in){
// union {
// u64 r;
// u32 i[2];
// } u;
// u32 t;
// u.r = in;
// t = u.i[0];
// u.i[0] = u.i[1];
// u.i[1] = t;
// return u.r;
//}
//# define swapMixedEndianFloat(X) X = floatSwap(X)
#else
//# define swapMixedEndianFloat(X)
#endif
/*
** Write the serialized data blob for the value stored in pMem into
** buf. It is assumed that the caller has allocated sufficient space.
** Return the number of bytes written.
**
** nBuf is the amount of space left in buf[]. nBuf must always be
** large enough to hold the entire field. Except, if the field is
** a blob with a zero-filled tail, then buf[] might be just the right
** size to hold everything except for the zero-filled tail. If buf[]
** is only big enough to hold the non-zero prefix, then only write that
** prefix into buf[]. But if buf[] is large enough to hold both the
** prefix and the tail then write the prefix and set the tail to all
** zeros.
**
** Return the number of bytes actually written into buf[]. The number
** of bytes in the zero-filled tail is included in the return value only
** if those bytes were zeroed in buf[].
*/
private static u32 sqlite3VdbeSerialPut(byte[] buf, int offset, int nBuf, Mem pMem, int file_format)
{
u32 serial_type = sqlite3VdbeSerialType(pMem, file_format);
u32 len;
/* Integer and Real */
if (serial_type <= 7 && serial_type > 0)
{
u64 v;
u32 i;
if (serial_type == 7)
{
//Debug.Assert( sizeof( v) == sizeof(pMem.r));
#if WINDOWS_PHONE || WINDOWS_MOBILE
v = (ulong)BitConverter.ToInt64(BitConverter.GetBytes(pMem.r),0);
#else
v = (ulong)BitConverter.DoubleToInt64Bits(pMem.r);// memcpy( &v, pMem.r, v ).Length;
#endif
#if SQLITE_MIXED_ENDIAN_64BIT_FLOAT
swapMixedEndianFloat( v );
#endif
}
else
{
v = (ulong)pMem.u.i;
}
len = i = sqlite3VdbeSerialTypeLen(serial_type);
Debug.Assert(len <= (u32)nBuf);
while (i-- != 0)
{
buf[offset + i] = (u8)(v & 0xFF);
v >>= 8;
}
return len;
}
/* String or blob */
if (serial_type >= 12)
{
// TO DO -- PASS TESTS WITH THIS ON Debug.Assert( pMem.n + ( ( pMem.flags & MEM_Zero ) != 0 ? pMem.u.nZero : 0 ) == (int)sqlite3VdbeSerialTypeLen( serial_type ) );
Debug.Assert(pMem.n <= nBuf);
if ((len = (u32)pMem.n) != 0)
if (pMem.zBLOB == null && String.IsNullOrEmpty(pMem.z))
{
}
else if (pMem.zBLOB != null && ((pMem.flags & MEM_Blob) != 0 || pMem.z == null))
Buffer.BlockCopy(pMem.zBLOB, 0, buf, offset, (int)len);//memcpy( buf, pMem.z, len );
else
Buffer.BlockCopy(Encoding.UTF8.GetBytes(pMem.z), 0, buf, offset, (int)len);//memcpy( buf, pMem.z, len );
if ((pMem.flags & MEM_Zero) != 0)
{
len += (u32)pMem.u.nZero;
Debug.Assert(nBuf >= 0);
if (len > (u32)nBuf)
{
len = (u32)nBuf;
}
Array.Clear(buf, offset + pMem.n, (int)(len - pMem.n));// memset( &buf[pMem.n], 0, len - pMem.n );
}
return len;
}
/* NULL or constants 0 or 1 */
return 0;
}
/*
** Deserialize the data blob pointed to by buf as serial type serial_type
** and store the result in pMem. Return the number of bytes read.
*/
private static u32 sqlite3VdbeSerialGet(
byte[] buf, /* Buffer to deserialize from */
int offset, /* Offset into Buffer */
u32 serial_type, /* Serial type to deserialize */
Mem pMem /* Memory cell to write value into */
)
{
switch (serial_type)
{
case 10: /* Reserved for future use */
case 11: /* Reserved for future use */
case 0:
{ /* NULL */
pMem.flags = MEM_Null;
pMem.n = 0;
pMem.z = null;
pMem.zBLOB = null;
break;
}
case 1:
{ /* 1-byte signed integer */
pMem.u.i = (sbyte)buf[offset + 0];
pMem.flags = MEM_Int;
return 1;
}
case 2:
{ /* 2-byte signed integer */
pMem.u.i = (int)((((sbyte)buf[offset + 0]) << 8) | buf[offset + 1]);
pMem.flags = MEM_Int;
return 2;
}
case 3:
{ /* 3-byte signed integer */
pMem.u.i = (int)((((sbyte)buf[offset + 0]) << 16) | (buf[offset + 1] << 8) | buf[offset + 2]);
pMem.flags = MEM_Int;
return 3;
}
case 4:
{ /* 4-byte signed integer */
pMem.u.i = (int)(((sbyte)buf[offset + 0] << 24) | (buf[offset + 1] << 16) | (buf[offset + 2] << 8) | buf[offset + 3]);
pMem.flags = MEM_Int;
return 4;
}
case 5:
{ /* 6-byte signed integer */
u64 x = (ulong)((((sbyte)buf[offset + 0]) << 8) | buf[offset + 1]);
u32 y = (u32)((buf[offset + 2] << 24) | (buf[offset + 3] << 16) | (buf[offset + 4] << 8) | buf[offset + 5]);
x = (x << 32) | y;
pMem.u.i = (i64)x;
pMem.flags = MEM_Int;
return 6;
}
case 6: /* 8-byte signed integer */
case 7:
{ /* IEEE floating point */
u64 x;
u32 y;
#if !NDEBUG && !SQLITE_OMIT_FLOATING_POINT
/* Verify that integers and floating point values use the same
** byte order. Or, that if SQLITE_MIXED_ENDIAN_64BIT_FLOAT is
** defined that 64-bit floating point values really are mixed
** endian.
*/
const u64 t1 = ((u64)0x3ff00000) << 32;
const double r1 = 1.0;
u64 t2 = t1;
#if SQLITE_MIXED_ENDIAN_64BIT_FLOAT
swapMixedEndianFloat(t2);
#endif
Debug.Assert(sizeof(double) == sizeof(u64) && memcmp(BitConverter.GetBytes(r1), BitConverter.GetBytes(t2), sizeof(double)) == 0);//Debug.Assert( sizeof(r1)==sizeof(t2) && memcmp(&r1, t2, sizeof(r1))==0 );
#endif
x = (u64)((buf[offset + 0] << 24) | (buf[offset + 1] << 16) | (buf[offset + 2] << 8) | buf[offset + 3]);
y = (u32)((buf[offset + 4] << 24) | (buf[offset + 5] << 16) | (buf[offset + 6] << 8) | buf[offset + 7]);
x = (x << 32) | y;
if (serial_type == 6)
{
pMem.u.i = (i64)x;
pMem.flags = MEM_Int;
}
else
{
Debug.Assert(sizeof(i64) == 8 && sizeof(double) == 8);
#if SQLITE_MIXED_ENDIAN_64BIT_FLOAT
swapMixedEndianFloat(x);
#endif
#if WINDOWS_PHONE || WINDOWS_MOBILE
pMem.r = BitConverter.ToDouble(BitConverter.GetBytes((long)x), 0);
#else
pMem.r = BitConverter.Int64BitsToDouble((long)x);// memcpy(pMem.r, x, sizeof(x))
#endif
pMem.flags = (u16)(sqlite3IsNaN(pMem.r) ? MEM_Null : MEM_Real);
}
return 8;
}
case 8: /* Integer 0 */
case 9:
{ /* Integer 1 */
pMem.u.i = serial_type - 8;
pMem.flags = MEM_Int;
return 0;
}
default:
{
u32 len = (serial_type - 12) / 2;
pMem.n = (int)len;
pMem.xDel = null;
if ((serial_type & 0x01) != 0)
{
pMem.flags = MEM_Str | MEM_Ephem;
if (len <= buf.Length - offset)
{
pMem.z = Encoding.UTF8.GetString(buf, offset, (int)len);//memcpy( buf, pMem.z, len );
pMem.n = pMem.z.Length;
}
else
{
pMem.z = ""; // Corrupted Data
pMem.n = 0;
}
pMem.zBLOB = null;
}
else
{
pMem.z = null;
pMem.zBLOB = sqlite3Malloc((int)len);
pMem.flags = MEM_Blob | MEM_Ephem;
if (len <= buf.Length - offset)
{
Buffer.BlockCopy(buf, offset, pMem.zBLOB, 0, (int)len);//memcpy( buf, pMem.z, len );
}
else
{
Buffer.BlockCopy(buf, offset, pMem.zBLOB, 0, buf.Length - offset - 1);
}
}
return len;
}
}
return 0;
}
private static int sqlite3VdbeSerialGet(
byte[] buf, /* Buffer to deserialize from */
u32 serial_type, /* Serial type to deserialize */
Mem pMem /* Memory cell to write value into */
)
{
switch (serial_type)
{
case 10: /* Reserved for future use */
case 11: /* Reserved for future use */
case 0:
{ /* NULL */
pMem.flags = MEM_Null;
break;
}
case 1:
{ /* 1-byte signed integer */
pMem.u.i = (sbyte)buf[0];
pMem.flags = MEM_Int;
return 1;
}
case 2:
{ /* 2-byte signed integer */
pMem.u.i = (int)(((buf[0]) << 8) | buf[1]);
pMem.flags = MEM_Int;
return 2;
}
case 3:
{ /* 3-byte signed integer */
pMem.u.i = (int)(((buf[0]) << 16) | (buf[1] << 8) | buf[2]);
pMem.flags = MEM_Int;
return 3;
}
case 4:
{ /* 4-byte signed integer */
pMem.u.i = (int)((buf[0] << 24) | (buf[1] << 16) | (buf[2] << 8) | buf[3]);
pMem.flags = MEM_Int;
return 4;
}
case 5:
{ /* 6-byte signed integer */
u64 x = (ulong)(((buf[0]) << 8) | buf[1]);
u32 y = (u32)((buf[2] << 24) | (buf[3] << 16) | (buf[4] << 8) | buf[5]);
x = (x << 32) | y;
pMem.u.i = (i64)x;
pMem.flags = MEM_Int;
return 6;
}
case 6: /* 8-byte signed integer */
case 7:
{ /* IEEE floating point */
u64 x;
u32 y;
#if !NDEBUG && !SQLITE_OMIT_FLOATING_POINT
/* Verify that integers and floating point values use the same
** byte order. Or, that if SQLITE_MIXED_ENDIAN_64BIT_FLOAT is
** defined that 64-bit floating point values really are mixed
** endian.
*/
const u64 t1 = ((u64)0x3ff00000) << 32;
const double r1 = 1.0;
u64 t2 = t1;
#if SQLITE_MIXED_ENDIAN_64BIT_FLOAT
swapMixedEndianFloat(t2);
#endif
Debug.Assert(sizeof(double) == sizeof(u64) && memcmp(BitConverter.GetBytes(r1), BitConverter.GetBytes(t2), sizeof(double)) == 0);//Debug.Assert( sizeof(r1)==sizeof(t2) && memcmp(&r1, t2, sizeof(r1))==0 );
#endif
x = (u64)((buf[0] << 24) | (buf[1] << 16) | (buf[2] << 8) | buf[3]);
y = (u32)((buf[4] << 24) | (buf[5] << 16) | (buf[6] << 8) | buf[7]);
x = (x << 32) | y;
if (serial_type == 6)
{
pMem.u.i = (i64)x;
pMem.flags = MEM_Int;
}
else
{
Debug.Assert(sizeof(i64) == 8 && sizeof(double) == 8);
#if SQLITE_MIXED_ENDIAN_64BIT_FLOAT
swapMixedEndianFloat(x);
#endif
#if WINDOWS_PHONE || WINDOWS_MOBILE
pMem.r = BitConverter.ToDouble(BitConverter.GetBytes((long)x), 0);
#else
pMem.r = BitConverter.Int64BitsToDouble((long)x);// memcpy(pMem.r, x, sizeof(x))
#endif
pMem.flags = MEM_Real;
}
return 8;
}
case 8: /* Integer 0 */
case 9:
{ /* Integer 1 */
pMem.u.i = serial_type - 8;
pMem.flags = MEM_Int;
return 0;
}
default:
{
int len = (int)((serial_type - 12) / 2);
pMem.xDel = null;
if ((serial_type & 0x01) != 0)
{
pMem.flags = MEM_Str | MEM_Ephem;
pMem.z = Encoding.UTF8.GetString(buf, 0, len);//memcpy( buf, pMem.z, len );
pMem.n = pMem.z.Length;// len;
pMem.zBLOB = null;
}
else
{
pMem.flags = MEM_Blob | MEM_Ephem;
pMem.zBLOB = sqlite3Malloc(len);
buf.CopyTo(pMem.zBLOB, 0);
pMem.n = len;// len;
pMem.z = null;
}
return len;
}
}
return 0;
}
/*
** Given the nKey-byte encoding of a record in pKey[], parse the
** record into a UnpackedRecord structure. Return a pointer to
** that structure.
**
** The calling function might provide szSpace bytes of memory
** space at pSpace. This space can be used to hold the returned
** VDbeParsedRecord structure if it is large enough. If it is
** not big enough, space is obtained from sqlite3Malloc().
**
** The returned structure should be closed by a call to
** sqlite3VdbeDeleteUnpackedRecord().
*/
private static UnpackedRecord sqlite3VdbeRecordUnpack(
KeyInfo pKeyInfo, /* Information about the record format */
int nKey, /* Size of the binary record */
byte[] pKey, /* The binary record */
UnpackedRecord pSpace, // char *pSpace, /* Unaligned space available to hold the object */
int szSpace /* Size of pSpace[] in bytes */
)
{
byte[] aKey = pKey;
UnpackedRecord p; /* The unpacked record that we will return */
int nByte; /* Memory space needed to hold p, in bytes */
int d;
u32 idx;
int u; /* Unsigned loop counter */
int szHdr = 0;
Mem pMem;
int nOff; /* Increase pSpace by this much to 8-byte align it */
/*
** We want to shift the pointer pSpace up such that it is 8-byte aligned.
** Thus, we need to calculate a value, nOff, between 0 and 7, to shift
** it by. If pSpace is already 8-byte aligned, nOff should be zero.
*/
//nOff = ( 8 - ( SQLITE_PTR_TO_INT( pSpace ) & 7 ) ) & 7;
//pSpace += nOff;
//szSpace -= nOff;
//nByte = ROUND8( sizeof( UnpackedRecord ) ) + sizeof( Mem ) * ( pKeyInfo->nField + 1 );
//if ( nByte > szSpace)
//{
//var p = new UnpackedRecord();//sqlite3DbMallocRaw(pKeyInfo.db, nByte);
// if ( p == null ) return null;
// p.flags = UNPACKED_NEED_FREE | UNPACKED_NEED_DESTROY;
//}
//else
{
p = pSpace;//(UnpackedRecord)pSpace;
p.flags = UNPACKED_NEED_DESTROY;
}
p.pKeyInfo = pKeyInfo;
p.nField = (u16)(pKeyInfo.nField + 1);
//p->aMem = pMem = (Mem)&( (char)p )[ROUND8( sizeof( UnpackedRecord ) )];
//Debug.Assert( EIGHT_BYTE_ALIGNMENT( pMem ) );
p.aMem = new Mem[p.nField + 1];
idx = (u32)getVarint32(aKey, 0, out szHdr);// GetVarint( aKey, szHdr );
d = (int)szHdr;
u = 0;
while (idx < (int)szHdr && u < p.nField && d <= nKey)
{
p.aMem[u] = sqlite3Malloc(p.aMem[u]);
pMem = p.aMem[u];
u32 serial_type = 0;
idx += (u32)getVarint32(aKey, idx, out serial_type);// GetVarint( aKey + idx, serial_type );
pMem.enc = pKeyInfo.enc;
pMem.db = pKeyInfo.db;
/* pMem->flags = 0; // sqlite3VdbeSerialGet() will set this for us */
//pMem.zMalloc = null;
d += (int)sqlite3VdbeSerialGet(aKey, d, serial_type, pMem);
//pMem++;
u++;
}
Debug.Assert(u <= pKeyInfo.nField + 1);
p.nField = (u16)u;
return p;// (void)p;
}
/*
** This routine destroys a UnpackedRecord object.
*/
private static void sqlite3VdbeDeleteUnpackedRecord(UnpackedRecord p)
{
#if SQLITE_DEBUG
int i;
Mem pMem;
Debug.Assert(p != null);
Debug.Assert((p.flags & UNPACKED_NEED_DESTROY) != 0);
//for ( i = 0, pMem = p->aMem ; i < p->nField ; i++, pMem++ )
//{
// /* The unpacked record is always constructed by the
// ** sqlite3VdbeUnpackRecord() function above, which makes all
// ** strings and blobs static. And none of the elements are
// ** ever transformed, so there is never anything to delete.
// */
// if ( NEVER( pMem->zMalloc ) ) sqlite3VdbeMemRelease( pMem );
//}
#endif
if ((p.flags & UNPACKED_NEED_FREE) != 0)
{
sqlite3DbFree(p.pKeyInfo.db, ref p.aMem);
p = null;
}
}
/*
** This function compares the two table rows or index records
** specified by {nKey1, pKey1} and pPKey2. It returns a negative, zero
** or positive integer if key1 is less than, equal to or
** greater than key2. The {nKey1, pKey1} key must be a blob
** created by th OP_MakeRecord opcode of the VDBE. The pPKey2
** key must be a parsed key such as obtained from
** sqlite3VdbeParseRecord.
**
** Key1 and Key2 do not have to contain the same number of fields.
** The key with fewer fields is usually compares less than the
** longer key. However if the UNPACKED_INCRKEY flags in pPKey2 is set
** and the common prefixes are equal, then key1 is less than key2.
** Or if the UNPACKED_MATCH_PREFIX flag is set and the prefixes are
** equal, then the keys are considered to be equal and
** the parts beyond the common prefix are ignored.
**
** If the UNPACKED_IGNORE_ROWID flag is set, then the last byte of
** the header of pKey1 is ignored. It is assumed that pKey1 is
** an index key, and thus ends with a rowid value. The last byte
** of the header will therefore be the serial type of the rowid:
** one of 1, 2, 3, 4, 5, 6, 8, or 9 - the integer serial types.
** The serial type of the final rowid will always be a single byte.
** By ignoring this last byte of the header, we force the comparison
** to ignore the rowid at the end of key1.
*/
private static Mem mem1 = new Mem();
// ALTERNATE FORM for C#
private static int sqlite3VdbeRecordCompare(
int nKey1, byte[] pKey1, /* Left key */
UnpackedRecord pPKey2 /* Right key */
)
{
return sqlite3VdbeRecordCompare(nKey1, pKey1, 0, pPKey2);
}
private static int sqlite3VdbeRecordCompare(
int nKey1, byte[] pKey1, /* Left key */
int offset,
UnpackedRecord pPKey2 /* Right key */
)
{
int d1; /* Offset into aKey[] of next data element */
u32 idx1; /* Offset into aKey[] of next header element */
u32 szHdr1; /* Number of bytes in header */
int i = 0;
int nField;
int rc = 0;
//byte[] aKey1 = new byte[pKey1.Length - offset];
//Buffer.BlockCopy( pKey1, offset, aKey1, 0, aKey1.Length );
KeyInfo pKeyInfo;
pKeyInfo = pPKey2.pKeyInfo;
mem1.enc = pKeyInfo.enc;
mem1.db = pKeyInfo.db;
/* mem1.flags = 0; // Will be initialized by sqlite3VdbeSerialGet() */
// VVA_ONLY( mem1.zMalloc = 0; ) /* Only needed by Debug.Assert() statements */
/* Compilers may complain that mem1.u.i is potentially uninitialized.
** We could initialize it, as shown here, to silence those complaints.
** But in fact, mem1.u.i will never actually be used uninitialized, and doing
** the unnecessary initialization has a measurable negative performance
** impact, since this routine is a very high runner. And so, we choose
** to ignore the compiler warnings and leave this variable uninitialized.
*/
/* mem1.u.i = 0; // not needed, here to silence compiler warning */
idx1 = (u32)((szHdr1 = pKey1[offset]) <= 0x7f ? 1 : getVarint32(pKey1, offset, out szHdr1));// GetVarint( aKey1, szHdr1 );
d1 = (int)szHdr1;
if ((pPKey2.flags & UNPACKED_IGNORE_ROWID) != 0)
{
szHdr1--;
}
nField = pKeyInfo.nField;
while (idx1 < szHdr1 && i < pPKey2.nField)
{
u32 serial_type1;
/* Read the serial types for the next element in each key. */
idx1 += (u32)((serial_type1 = pKey1[offset + idx1]) <= 0x7f ? 1 : getVarint32(pKey1, (uint)(offset + idx1), out serial_type1)); //GetVarint( aKey1 + idx1, serial_type1 );
if (d1 <= 0 || d1 >= nKey1 && sqlite3VdbeSerialTypeLen(serial_type1) > 0)
break;
/* Extract the values to be compared.
*/
d1 += (int)sqlite3VdbeSerialGet(pKey1, offset + d1, serial_type1, mem1);//sqlite3VdbeSerialGet( aKey1, d1, serial_type1, mem1 );
/* Do the comparison
*/
rc = sqlite3MemCompare(mem1, pPKey2.aMem[i], i < nField ? pKeyInfo.aColl[i] : null);
if (rc != 0)
{
//Debug.Assert( mem1.zMalloc==null ); /* See comment below */
/* Invert the result if we are using DESC sort order. */
if (pKeyInfo.aSortOrder != null && i < nField && pKeyInfo.aSortOrder[i] != 0)
{
rc = -rc;
}
/* If the PREFIX_SEARCH flag is set and all fields except the final
** rowid field were equal, then clear the PREFIX_SEARCH flag and set
** pPKey2->rowid to the value of the rowid field in (pKey1, nKey1).
** This is used by the OP_IsUnique opcode.
*/
if ((pPKey2.flags & UNPACKED_PREFIX_SEARCH) != 0 && i == (pPKey2.nField - 1))
{
Debug.Assert(idx1 == szHdr1 && rc != 0);
Debug.Assert((mem1.flags & MEM_Int) != 0);
pPKey2.flags = (ushort)(pPKey2.flags & ~UNPACKED_PREFIX_SEARCH);
pPKey2.rowid = mem1.u.i;
}
return rc;
}
i++;
}
/* No memory allocation is ever used on mem1. Prove this using
** the following Debug.Assert(). If the Debug.Assert() fails, it indicates a
** memory leak and a need to call sqlite3VdbeMemRelease(&mem1).
*/
//Debug.Assert( mem1.zMalloc==null );
/* rc==0 here means that one of the keys ran out of fields and
** all the fields up to that point were equal. If the UNPACKED_INCRKEY
** flag is set, then break the tie by treating key2 as larger.
** If the UPACKED_PREFIX_MATCH flag is set, then keys with common prefixes
** are considered to be equal. Otherwise, the longer key is the
** larger. As it happens, the pPKey2 will always be the longer
** if there is a difference.
*/
Debug.Assert(rc == 0);
if ((pPKey2.flags & UNPACKED_INCRKEY) != 0)
{
rc = -1;
}
else if ((pPKey2.flags & UNPACKED_PREFIX_MATCH) != 0)
{
/* Leave rc==0 */
}
else if (idx1 < szHdr1)
{
rc = 1;
}
return rc;
}
/*
** pCur points at an index entry created using the OP_MakeRecord opcode.
** Read the rowid (the last field in the record) and store it in *rowid.
** Return SQLITE_OK if everything works, or an error code otherwise.
**
** pCur might be pointing to text obtained from a corrupt database file.
** So the content cannot be trusted. Do appropriate checks on the content.
*/
private static int sqlite3VdbeIdxRowid(sqlite3 db, BtCursor pCur, ref i64 rowid)
{
i64 nCellKey = 0;
int rc;
u32 szHdr = 0; /* Size of the header */
u32 typeRowid = 0; /* Serial type of the rowid */
u32 lenRowid; /* Size of the rowid */
Mem m = null;
Mem v = null;
v = sqlite3Malloc(v);
UNUSED_PARAMETER(db);
/* Get the size of the index entry. Only indices entries of less
** than 2GiB are support - anything large must be database corruption.
** Any corruption is detected in sqlite3BtreeParseCellPtr(), though, so
** this code can safely assume that nCellKey is 32-bits
*/
Debug.Assert(sqlite3BtreeCursorIsValid(pCur));
rc = sqlite3BtreeKeySize(pCur, ref nCellKey);
Debug.Assert(rc == SQLITE_OK); /* pCur is always valid so KeySize cannot fail */
Debug.Assert(((u32)nCellKey & SQLITE_MAX_U32) == (u64)nCellKey);
/* Read in the complete content of the index entry */
m = sqlite3Malloc(m);
// memset(&m, 0, sizeof(m));
rc = sqlite3VdbeMemFromBtree(pCur, 0, (int)nCellKey, true, m);
if (rc != 0)
{
return rc;
}
/* The index entry must begin with a header size */
getVarint32(m.zBLOB, 0, out szHdr);
testcase(szHdr == 3);
testcase(szHdr == m.n);
if (unlikely(szHdr < 3 || (int)szHdr > m.n))
{
goto idx_rowid_corruption;
}
/* The last field of the index should be an integer - the ROWID.
** Verify that the last entry really is an integer. */
getVarint32(m.zBLOB, szHdr - 1, out typeRowid);
testcase(typeRowid == 1);
testcase(typeRowid == 2);
testcase(typeRowid == 3);
testcase(typeRowid == 4);
testcase(typeRowid == 5);
testcase(typeRowid == 6);
testcase(typeRowid == 8);
testcase(typeRowid == 9);
if (unlikely(typeRowid < 1 || typeRowid > 9 || typeRowid == 7))
{
goto idx_rowid_corruption;
}
lenRowid = (u32)sqlite3VdbeSerialTypeLen(typeRowid);
testcase((u32)m.n == szHdr + lenRowid);
if (unlikely((u32)m.n < szHdr + lenRowid))
{
goto idx_rowid_corruption;
}
/* Fetch the integer off the end of the index record */
sqlite3VdbeSerialGet(m.zBLOB, (int)(m.n - lenRowid), typeRowid, v);
rowid = v.u.i;
sqlite3VdbeMemRelease(m);
return SQLITE_OK;
/* Jump here if database corruption is detected after m has been
** allocated. Free the m object and return SQLITE_CORRUPT. */
idx_rowid_corruption:
//testcase( m.zMalloc != 0 );
sqlite3VdbeMemRelease(m);
return SQLITE_CORRUPT_BKPT();
}
/*
** Compare the key of the index entry that cursor pC is pointing to against
** the key string in pUnpacked. Write into *pRes a number
** that is negative, zero, or positive if pC is less than, equal to,
** or greater than pUnpacked. Return SQLITE_OK on success.
**
** pUnpacked is either created without a rowid or is truncated so that it
** omits the rowid at the end. The rowid at the end of the index entry
** is ignored as well. Hence, this routine only compares the prefixes
** of the keys prior to the final rowid, not the entire key.
*/
private static int sqlite3VdbeIdxKeyCompare(
VdbeCursor pC, /* The cursor to compare against */
UnpackedRecord pUnpacked, /* Unpacked version of key to compare against */
ref int res /* Write the comparison result here */
)
{
i64 nCellKey = 0;
int rc;
BtCursor pCur = pC.pCursor;
Mem m = null;
Debug.Assert(sqlite3BtreeCursorIsValid(pCur));
rc = sqlite3BtreeKeySize(pCur, ref nCellKey);
Debug.Assert(rc == SQLITE_OK); /* pCur is always valid so KeySize cannot fail */
/* nCellKey will always be between 0 and 0xffffffff because of the say
** that btreeParseCellPtr() and sqlite3GetVarint32() are implemented */
if (nCellKey <= 0 || nCellKey > 0x7fffffff)
{
res = 0;
return SQLITE_CORRUPT_BKPT();
}
m = sqlite3Malloc(m);
// memset(&m, 0, sizeof(m));
rc = sqlite3VdbeMemFromBtree(pC.pCursor, 0, (int)nCellKey, true, m);
if (rc != 0)
{
return rc;
}
Debug.Assert((pUnpacked.flags & UNPACKED_IGNORE_ROWID) != 0);
res = sqlite3VdbeRecordCompare(m.n, m.zBLOB, pUnpacked);
sqlite3VdbeMemRelease(m);
return SQLITE_OK;
}
/*
** This routine sets the value to be returned by subsequent calls to
** sqlite3_changes() on the database handle 'db'.
*/
private static void sqlite3VdbeSetChanges(sqlite3 db, int nChange)
{
Debug.Assert(sqlite3_mutex_held(db.mutex));
db.nChange = nChange;
db.nTotalChange += nChange;
}
/*
** Set a flag in the vdbe to update the change counter when it is finalised
** or reset.
*/
private static void sqlite3VdbeCountChanges(Vdbe v)
{
v.changeCntOn = true;
}
/*
** Mark every prepared statement associated with a database connection
** as expired.
**
** An expired statement means that recompilation of the statement is
** recommend. Statements expire when things happen that make their
** programs obsolete. Removing user-defined functions or collating
** sequences, or changing an authorization function are the types of
** things that make prepared statements obsolete.
*/
private static void sqlite3ExpirePreparedStatements(sqlite3 db)
{
Vdbe p;
for (p = db.pVdbe; p != null; p = p.pNext)
{
p.expired = true;
}
}
/*
** Return the database associated with the Vdbe.
*/
private static sqlite3 sqlite3VdbeDb(Vdbe v)
{
return v.db;
}
/*
** Return a pointer to an sqlite3_value structure containing the value bound
** parameter iVar of VM v. Except, if the value is an SQL NULL, return
** 0 instead. Unless it is NULL, apply affinity aff (one of the SQLITE_AFF_*
** constants) to the value before returning it.
**
** The returned value must be freed by the caller using sqlite3ValueFree().
*/
private static sqlite3_value sqlite3VdbeGetValue(Vdbe v, int iVar, u8 aff)
{
Debug.Assert(iVar > 0);
if (v != null)
{
Mem pMem = v.aVar[iVar - 1];
if (0 == (pMem.flags & MEM_Null))
{
sqlite3_value pRet = sqlite3ValueNew(v.db);
if (pRet != null)
{
sqlite3VdbeMemCopy((Mem)pRet, pMem);
sqlite3ValueApplyAffinity(pRet, (char)aff, SQLITE_UTF8);
sqlite3VdbeMemStoreType((Mem)pRet);
}
return pRet;
}
}
return null;
}
/*
** Configure SQL variable iVar so that binding a new value to it signals
** to sqlite3_reoptimize() that re-preparing the statement may result
** in a better query plan.
*/
private static void sqlite3VdbeSetVarmask(Vdbe v, int iVar)
{
Debug.Assert(iVar > 0);
if (iVar > 32)
{
v.expmask = 0xffffffff;
}
else
{
v.expmask |= ((u32)1 << (iVar - 1));
}
}
}
}