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vdbe_c.cs
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executable file
·7079 lines (6718 loc) · 229 KB
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using System.Diagnostics;
using System.IO;
using System.Text;
using FILE = System.IO.TextWriter;
using i32 = System.Int32;
using i64 = System.Int64;
using sqlite_int64 = System.Int64;
using u8 = System.Byte;
using u16 = System.UInt16;
using u32 = System.UInt32;
using u64 = System.UInt64;
using sqlite3_int64 = System.Int64;
using Pgno = System.UInt32;
/*
** 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 System.Data.SQLite
{
using sqlite3_value = Sqlite3.Mem;
using Op = Sqlite3.VdbeOp;
using System;
public partial class Sqlite3
{
/*
** 2001 September 15
**
** 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.
**
*************************************************************************
** The code in this file implements execution method of the
** Virtual Database Engine (VDBE). A separate file ("vdbeaux.c")
** handles housekeeping details such as creating and deleting
** VDBE instances. This file is solely interested in executing
** the VDBE program.
**
** In the external interface, an "sqlite3_stmt*" is an opaque pointer
** to a VDBE.
**
** The SQL parser generates a program which is then executed by
** the VDBE to do the work of the SQL statement. VDBE programs are
** similar in form to assembly language. The program consists of
** a linear sequence of operations. Each operation has an opcode
** and 5 operands. Operands P1, P2, and P3 are integers. Operand P4
** is a null-terminated string. Operand P5 is an unsigned character.
** Few opcodes use all 5 operands.
**
** Computation results are stored on a set of registers numbered beginning
** with 1 and going up to Vdbe.nMem. Each register can store
** either an integer, a null-terminated string, a floating point
** number, or the SQL "NULL" value. An implicit conversion from one
** type to the other occurs as necessary.
**
** Most of the code in this file is taken up by the sqlite3VdbeExec()
** function which does the work of interpreting a VDBE program.
** But other routines are also provided to help in building up
** a program instruction by instruction.
**
** Various scripts scan this source file in order to generate HTML
** documentation, headers files, or other derived files. The formatting
** of the code in this file is, therefore, important. See other comments
** in this file for details. If in doubt, do not deviate from existing
** commenting and indentation practices when changing or adding code.
*************************************************************************
** 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"
/*
** Invoke this macro on memory cells just prior to changing the
** value of the cell. This macro verifies that shallow copies are
** not misused.
*/
#if SQLITE_DEBUG
//# define memAboutToChange(P,M) sqlite3VdbeMemPrepareToChange(P,M)
static void memAboutToChange( Vdbe P, Mem M )
{
sqlite3VdbeMemPrepareToChange( P, M );
}
#else
//# define memAboutToChange(P,M)
static void memAboutToChange(Vdbe P, Mem M) { }
#endif
/*
** The following global variable is incremented every time a cursor
** moves, either by the OP_SeekXX, OP_Next, or OP_Prev opcodes. The test
** procedures use this information to make sure that indices are
** working correctly. This variable has no function other than to
** help verify the correct operation of the library.
*/
#if SQLITE_TEST
#if !TCLSH
static int sqlite3_search_count = 0;
#else
static tcl.lang.Var.SQLITE3_GETSET sqlite3_search_count = new tcl.lang.Var.SQLITE3_GETSET( "sqlite3_search_count" );
#endif
#endif
/*
** When this global variable is positive, it gets decremented once before
** each instruction in the VDBE. When reaches zero, the u1.isInterrupted
** field of the sqlite3 structure is set in order to simulate and interrupt.
**
** This facility is used for testing purposes only. It does not function
** in an ordinary build.
*/
#if SQLITE_TEST
#if !TCLSH
static int sqlite3_interrupt_count = 0;
#else
static tcl.lang.Var.SQLITE3_GETSET sqlite3_interrupt_count = new tcl.lang.Var.SQLITE3_GETSET( "sqlite3_interrupt_count" );
#endif
#endif
/*
** The next global variable is incremented each type the OP_Sort opcode
** is executed. The test procedures use this information to make sure that
** sorting is occurring or not occurring at appropriate times. This variable
** has no function other than to help verify the correct operation of the
** library.
*/
#if SQLITE_TEST
#if !TCLSH
static int sqlite3_sort_count = 0;
#else
static tcl.lang.Var.SQLITE3_GETSET sqlite3_sort_count = new tcl.lang.Var.SQLITE3_GETSET( "sqlite3_sort_count" );
#endif
#endif
/*
** The next global variable records the size of the largest MEM_Blob
** or MEM_Str that has been used by a VDBE opcode. The test procedures
** use this information to make sure that the zero-blob functionality
** is working correctly. This variable has no function other than to
** help verify the correct operation of the library.
*/
#if SQLITE_TEST
#if !TCLSH
static int sqlite3_max_blobsize = 0;
#else
static tcl.lang.Var.SQLITE3_GETSET sqlite3_max_blobsize = new tcl.lang.Var.SQLITE3_GETSET( "sqlite3_max_blobsize" );
#endif
static void updateMaxBlobsize( Mem p )
{
#if !TCLSH
if ( ( p.flags & ( MEM_Str | MEM_Blob ) ) != 0 && p.n > sqlite3_max_blobsize )
{
sqlite3_max_blobsize = p.n;
}
#else
if ( ( p.flags & ( MEM_Str | MEM_Blob ) ) != 0 && p.n > sqlite3_max_blobsize.iValue )
{
sqlite3_max_blobsize.iValue = p.n;
}
#endif
}
#endif
/*
** The next global variable is incremented each type the OP_Found opcode
** is executed. This is used to test whether or not the foreign key
** operation implemented using OP_FkIsZero is working. This variable
** has no function other than to help verify the correct operation of the
** library.
*/
#if SQLITE_TEST
#if !TCLSH
static int sqlite3_found_count = 0;
#else
static tcl.lang.Var.SQLITE3_GETSET sqlite3_found_count = new tcl.lang.Var.SQLITE3_GETSET( "sqlite3_found_count" );
#endif
#endif
/*
/*
** Test a register to see if it exceeds the current maximum blob size.
** If it does, record the new maximum blob size.
*/
#if SQLITE_TEST && !SQLITE_OMIT_BUILTIN_TEST
static void UPDATE_MAX_BLOBSIZE( Mem P )
{
updateMaxBlobsize( P );
}
#else
//# define UPDATE_MAX_BLOBSIZE(P)
static void UPDATE_MAX_BLOBSIZE(Mem P) { }
#endif
/*
** Convert the given register into a string if it isn't one
** already. Return non-zero if a malloc() fails.
*/
//#define Stringify(P, enc) \
// if(((P).flags&(MEM_Str|MEM_Blob))==0 && sqlite3VdbeMemStringify(P,enc)) \
// { goto no_mem; }
/*
** An ephemeral string value (signified by the MEM_Ephem flag) contains
** a pointer to a dynamically allocated string where some other entity
** is responsible for deallocating that string. Because the register
** does not control the string, it might be deleted without the register
** knowing it.
**
** This routine converts an ephemeral string into a dynamically allocated
** string that the register itself controls. In other words, it
** converts an MEM_Ephem string into an MEM_Dyn string.
*/
//#define Deephemeralize(P) \
// if( ((P).flags&MEM_Ephem)!=0 \
// && sqlite3VdbeMemMakeWriteable(P) ){ goto no_mem;}
static void Deephemeralize(Mem P)
{
}
/*
** Call sqlite3VdbeMemExpandBlob() on the supplied value (type Mem)
** P if required.
*/
//#define ExpandBlob(P) (((P).flags&MEM_Zero)?sqlite3VdbeMemExpandBlob(P):0)
static int ExpandBlob(Mem P)
{
return (P.flags & MEM_Zero) != 0 ? sqlite3VdbeMemExpandBlob(P) : 0;
}
/*
** Argument pMem points at a register that will be passed to a
** user-defined function or returned to the user as the result of a query.
** This routine sets the pMem.type variable used by the sqlite3_value_*()
** routines.
*/
static void sqlite3VdbeMemStoreType(Mem pMem)
{
int flags = pMem.flags;
if ((flags & MEM_Null) != 0)
{
pMem.type = SQLITE_NULL;
pMem.z = null;
pMem.zBLOB = null;
}
else if ((flags & MEM_Int) != 0)
{
pMem.type = SQLITE_INTEGER;
}
else if ((flags & MEM_Real) != 0)
{
pMem.type = SQLITE_FLOAT;
}
else if ((flags & MEM_Str) != 0)
{
pMem.type = SQLITE_TEXT;
}
else
{
pMem.type = SQLITE_BLOB;
}
}
/*
** Allocate VdbeCursor number iCur. Return a pointer to it. Return NULL
** if we run out of memory.
*/
static VdbeCursor allocateCursor(
Vdbe p, /* The virtual machine */
int iCur, /* Index of the new VdbeCursor */
int nField, /* Number of fields in the table or index */
int iDb, /* When database the cursor belongs to, or -1 */
int isBtreeCursor /* True for B-Tree. False for pseudo-table or vtab */
)
{
/* Find the memory cell that will be used to store the blob of memory
** required for this VdbeCursor structure. It is convenient to use a
** vdbe memory cell to manage the memory allocation required for a
** VdbeCursor structure for the following reasons:
**
** * Sometimes cursor numbers are used for a couple of different
** purposes in a vdbe program. The different uses might require
** different sized allocations. Memory cells provide growable
** allocations.
**
** * When using ENABLE_MEMORY_MANAGEMENT, memory cell buffers can
** be freed lazily via the sqlite3_release_memory() API. This
** minimizes the number of malloc calls made by the system.
**
** Memory cells for cursors are allocated at the top of the address
** space. Memory cell (p.nMem) corresponds to cursor 0. Space for
** cursor 1 is managed by memory cell (p.nMem-1), etc.
*/
//Mem pMem = p.aMem[p.nMem - iCur];
//int nByte;
VdbeCursor pCx = null;
//ROUND8(sizeof(VdbeCursor)) +
//( isBtreeCursor ? sqlite3BtreeCursorSize() : 0 ) +
//2 * nField * sizeof( u32 );
Debug.Assert(iCur < p.nCursor);
if (p.apCsr[iCur] != null)
{
sqlite3VdbeFreeCursor(p, p.apCsr[iCur]);
p.apCsr[iCur] = null;
}
//if ( SQLITE_OK == sqlite3VdbeMemGrow( pMem, nByte, 0 ) )
{
p.apCsr[iCur] = pCx = new VdbeCursor();// (VdbeCursor)pMem.z;
//memset(pCx, 0, sizeof(VdbeCursor));
pCx.iDb = iDb;
pCx.nField = nField;
if (nField != 0)
{
pCx.aType = new u32[nField];// (u32)&pMem.z[ROUND8(sizeof( VdbeCursor ))];
}
if (isBtreeCursor != 0)
{
pCx.pCursor = sqlite3MemMallocBtCursor(pCx.pCursor);// (BtCursor)&pMem.z[ROUND8(sizeof( VdbeCursor )) + 2 * nField * sizeof( u32 )];
sqlite3BtreeCursorZero(pCx.pCursor);
}
}
return pCx;
}
/*
** Try to convert a value into a numeric representation if we can
** do so without loss of information. In other words, if the string
** looks like a number, convert it into a number. If it does not
** look like a number, leave it alone.
*/
static void applyNumericAffinity(Mem pRec)
{
if ((pRec.flags & (MEM_Real | MEM_Int)) == 0)
{
double rValue = 0.0;
i64 iValue = 0;
u8 enc = pRec.enc;
if ((pRec.flags & MEM_Str) == 0)
return;
if (sqlite3AtoF(pRec.z, ref rValue, pRec.n, enc) == false)
return;
if (0 == sqlite3Atoi64(pRec.z, ref iValue, pRec.n, enc))
{
pRec.u.i = iValue;
pRec.flags |= MEM_Int;
}
else
{
pRec.r = rValue;
pRec.flags |= MEM_Real;
}
}
}
/*
** Processing is determine by the affinity parameter:
**
** SQLITE_AFF_INTEGER:
** SQLITE_AFF_REAL:
** SQLITE_AFF_NUMERIC:
** Try to convert pRec to an integer representation or a
** floating-point representation if an integer representation
** is not possible. Note that the integer representation is
** always preferred, even if the affinity is REAL, because
** an integer representation is more space efficient on disk.
**
** SQLITE_AFF_TEXT:
** Convert pRec to a text representation.
**
** SQLITE_AFF_NONE:
** No-op. pRec is unchanged.
*/
static void applyAffinity(
Mem pRec, /* The value to apply affinity to */
char affinity, /* The affinity to be applied */
int enc /* Use this text encoding */
)
{
if (affinity == SQLITE_AFF_TEXT)
{
/* Only attempt the conversion to TEXT if there is an integer or real
** representation (blob and NULL do not get converted) but no string
** representation.
*/
if (0 == (pRec.flags & MEM_Str) && (pRec.flags & (MEM_Real | MEM_Int)) != 0)
{
sqlite3VdbeMemStringify(pRec, enc);
}
if ((pRec.flags & (MEM_Blob | MEM_Str)) == (MEM_Blob | MEM_Str))
{
StringBuilder sb = new StringBuilder(pRec.zBLOB.Length);
for (int i = 0; i < pRec.zBLOB.Length; i++)
sb.Append((char)pRec.zBLOB[i]);
pRec.z = sb.ToString();
sqlite3_free(ref pRec.zBLOB);
pRec.flags = (u16)(pRec.flags & ~MEM_Blob);
}
pRec.flags = (u16)(pRec.flags & ~(MEM_Real | MEM_Int));
}
else if (affinity != SQLITE_AFF_NONE)
{
Debug.Assert(affinity == SQLITE_AFF_INTEGER || affinity == SQLITE_AFF_REAL
|| affinity == SQLITE_AFF_NUMERIC);
applyNumericAffinity(pRec);
if ((pRec.flags & MEM_Real) != 0)
{
sqlite3VdbeIntegerAffinity(pRec);
}
}
}
/*
** Try to convert the type of a function argument or a result column
** into a numeric representation. Use either INTEGER or REAL whichever
** is appropriate. But only do the conversion if it is possible without
** loss of information and return the revised type of the argument.
*/
static int sqlite3_value_numeric_type(sqlite3_value pVal)
{
Mem pMem = (Mem)pVal;
if (pMem.type == SQLITE_TEXT)
{
applyNumericAffinity(pMem);
sqlite3VdbeMemStoreType(pMem);
}
return pMem.type;
}
/*
** Exported version of applyAffinity(). This one works on sqlite3_value*,
** not the internal Mem type.
*/
static void sqlite3ValueApplyAffinity(
sqlite3_value pVal,
char affinity,
int enc
)
{
applyAffinity((Mem)pVal, affinity, enc);
}
#if SQLITE_DEBUG
/*
** Write a nice string representation of the contents of cell pMem
** into buffer zBuf, length nBuf.
*/
static StringBuilder zCsr = new StringBuilder( 100 );
static void sqlite3VdbeMemPrettyPrint( Mem pMem, StringBuilder zBuf )
{
zBuf.Length = 0;
zCsr.Length = 0;
int f = pMem.flags;
string[] encnames = new string[] { "(X)", "(8)", "(16LE)", "(16BE)" };
if ( ( f & MEM_Blob ) != 0 )
{
int i;
char c;
if ( ( f & MEM_Dyn ) != 0 )
{
c = 'z';
Debug.Assert( ( f & ( MEM_Static | MEM_Ephem ) ) == 0 );
}
else if ( ( f & MEM_Static ) != 0 )
{
c = 't';
Debug.Assert( ( f & ( MEM_Dyn | MEM_Ephem ) ) == 0 );
}
else if ( ( f & MEM_Ephem ) != 0 )
{
c = 'e';
Debug.Assert( ( f & ( MEM_Static | MEM_Dyn ) ) == 0 );
}
else
{
c = 's';
}
sqlite3_snprintf( 100, zCsr, "%c", c );
zBuf.Append( zCsr );//zCsr += sqlite3Strlen30(zCsr);
sqlite3_snprintf( 100, zCsr, "%d[", pMem.n );
zBuf.Append( zCsr );//zCsr += sqlite3Strlen30(zCsr);
for ( i = 0; i < 16 && i < pMem.n; i++ )
{
sqlite3_snprintf( 100, zCsr, "%02X", ( (int)pMem.zBLOB[i] & 0xFF ) );
zBuf.Append( zCsr );//zCsr += sqlite3Strlen30(zCsr);
}
for ( i = 0; i < 16 && i < pMem.n; i++ )
{
char z = (char)pMem.zBLOB[i];
if ( z < 32 || z > 126 )
zBuf.Append( '.' );//*zCsr++ = '.';
else
zBuf.Append( z );//*zCsr++ = z;
}
sqlite3_snprintf( 100, zCsr, "]%s", encnames[pMem.enc] );
zBuf.Append( zCsr );//zCsr += sqlite3Strlen30(zCsr);
if ( ( f & MEM_Zero ) != 0 )
{
sqlite3_snprintf( 100, zCsr, "+%dz", pMem.u.nZero );
zBuf.Append( zCsr );//zCsr += sqlite3Strlen30(zCsr);
}
//*zCsr = '\0';
}
else if ( ( f & MEM_Str ) != 0 )
{
int j;//, k;
zBuf.Append( ' ' );
if ( ( f & MEM_Dyn ) != 0 )
{
zBuf.Append( 'z' );
Debug.Assert( ( f & ( MEM_Static | MEM_Ephem ) ) == 0 );
}
else if ( ( f & MEM_Static ) != 0 )
{
zBuf.Append( 't' );
Debug.Assert( ( f & ( MEM_Dyn | MEM_Ephem ) ) == 0 );
}
else if ( ( f & MEM_Ephem ) != 0 )
{
zBuf.Append( 's' ); //zBuf.Append( 'e' );
Debug.Assert( ( f & ( MEM_Static | MEM_Dyn ) ) == 0 );
}
else
{
zBuf.Append( 's' );
}
//k = 2;
sqlite3_snprintf( 100, zCsr, "%d", pMem.n );//zBuf[k], "%d", pMem.n );
zBuf.Append( zCsr );
//k += sqlite3Strlen30( &zBuf[k] );
zBuf.Append( '[' );// zBuf[k++] = '[';
for ( j = 0; j < 15 && j < pMem.n; j++ )
{
u8 c = pMem.z != null ? (u8)pMem.z[j] : pMem.zBLOB[j];
if ( c >= 0x20 && c < 0x7f )
{
zBuf.Append( (char)c );//zBuf[k++] = c;
}
else
{
zBuf.Append( '.' );//zBuf[k++] = '.';
}
}
zBuf.Append( ']' );//zBuf[k++] = ']';
sqlite3_snprintf( 100, zCsr, encnames[pMem.enc] );//& zBuf[k], encnames[pMem.enc] );
zBuf.Append( zCsr );
//k += sqlite3Strlen30( &zBuf[k] );
//zBuf[k++] = 0;
}
}
#endif
#if SQLITE_DEBUG
/*
** Print the value of a register for tracing purposes:
*/
static void memTracePrint( FILE _out, Mem p )
{
if ( ( p.flags & MEM_Null ) != 0 )
{
fprintf( _out, " NULL" );
}
else if ( ( p.flags & ( MEM_Int | MEM_Str ) ) == ( MEM_Int | MEM_Str ) )
{
fprintf( _out, " si:%lld", p.u.i );
#if !SQLITE_OMIT_FLOATING_POINT
}
else if ( ( p.flags & MEM_Int ) != 0 )
{
fprintf( _out, " i:%lld", p.u.i );
#endif
}
else if ( ( p.flags & MEM_Real ) != 0 )
{
fprintf( _out, " r:%g", p.r );
}
else if ( ( p.flags & MEM_RowSet ) != 0 )
{
fprintf( _out, " (rowset)" );
}
else
{
StringBuilder zBuf = new StringBuilder( 200 );
sqlite3VdbeMemPrettyPrint( p, zBuf );
fprintf( _out, " " );
fprintf( _out, "%s", zBuf );
}
}
static void registerTrace( FILE _out, int iReg, Mem p )
{
fprintf( _out, "reg[%d] = ", iReg );
memTracePrint( _out, p );
fprintf( _out, "\n" );
}
#endif
#if SQLITE_DEBUG
//# define REGISTER_TRACE(R,M) if(p.trace)registerTrace(p.trace,R,M)
static void REGISTER_TRACE( Vdbe p, int R, Mem M )
{
if ( p.trace != null )
registerTrace( p.trace, R, M );
}
#else
//# define REGISTER_TRACE(R,M)
static void REGISTER_TRACE(Vdbe p, int R, Mem M) { }
#endif
#if VDBE_PROFILE
/*
** hwtime.h contains inline assembler code for implementing
** high-performance timing routines.
*/
//#include "hwtime.h"
#endif
/*
** The CHECK_FOR_INTERRUPT macro defined here looks to see if the
** sqlite3_interrupt() routine has been called. If it has been, then
** processing of the VDBE program is interrupted.
**
** This macro added to every instruction that does a jump in order to
** implement a loop. This test used to be on every single instruction,
** but that meant we more testing that we needed. By only testing the
** flag on jump instructions, we get a (small) speed improvement.
*/
//#define CHECK_FOR_INTERRUPT \
// if( db.u1.isInterrupted ) goto abort_due_to_interrupt;
#if !NDEBUG
/*
** This function is only called from within an Debug.Assert() expression. It
** checks that the sqlite3.nTransaction variable is correctly set to
** the number of non-transaction savepoints currently in the
** linked list starting at sqlite3.pSavepoint.
**
** Usage:
**
** Debug.Assert( checkSavepointCount(db) );
*/
static int checkSavepointCount( sqlite3 db )
{
int n = 0;
Savepoint p;
for ( p = db.pSavepoint; p != null; p = p.pNext )
n++;
Debug.Assert( n == ( db.nSavepoint + db.isTransactionSavepoint ) );
return 1;
}
#else
static int checkSavepointCount(sqlite3 db) { return 1; }
#endif
/// <summary>
/// Transfer error message text from an sqlite3_vtab.zErrMsg (text stored
/// in memory obtained from sqlite3_malloc) into a Vdbe.zErrMsg (text stored
/// in memory obtained from sqlite3DbMalloc).
/// </summary>
static void importVtabErrMsg(Vdbe p, sqlite3_vtab pVtab)
{
sqlite3 db = p.db;
sqlite3DbFree(db, ref p.zErrMsg);
p.zErrMsg = pVtab.zErrMsg; // sqlite3DbStrDup( db, pVtab.zErrMsg );
//sqlite3_free( pVtab.zErrMsg );
pVtab.zErrMsg = null;
}
/// <summary>
/// Execute as much of a VDBE program as we can then return.
///
/// sqlite3VdbeMakeReady() must be called before this routine in order to
/// close the program with a final OP_Halt and to set up the callbacks
/// and the error message pointer.
///
/// Whenever a row or result data is available, this routine will either
/// invoke the result callback (if there is one) or return with
/// SQLITE_ROW.
///
/// If an attempt is made to open a locked database, then this routine
/// will either invoke the busy callback (if there is one) or it will
/// return SQLITE_BUSY.
///
/// If an error occurs, an error message is written to memory obtained
/// from sqlite3Malloc() and p.zErrMsg is made to point to that memory.
/// The error code is stored in p.rc and this routine returns SQLITE_ERROR.
///
/// If the callback ever returns non-zero, then the program exits
/// immediately. There will be no error message but the p.rc field is
/// set to SQLITE_ABORT and this routine will return SQLITE_ERROR.
///
/// A memory allocation error causes p.rc to be set to SQLITE_NOMEM and this
/// routine to return SQLITE_ERROR.
///
/// Other fatal errors return SQLITE_ERROR.
///
/// After this routine has finished, sqlite3VdbeFinalize() should be
/// used to clean up the mess that was left behind
/// </summary>
/// <param name='p'>
/// The VDBE
/// </param>
static int sqlite3VdbeExec(Vdbe p)
{
int pc = 0; /* The program counter */
Op[] aOp = p.aOp; /* Copy of p.aOp */
Op pOp; /* Current operation */
int rc = SQLITE_OK; /* Value to return */
sqlite3 db = p.db; /* The database */
u8 resetSchemaOnFault = 0; /* Reset schema after an error if positive */
u8 encoding = ENC(db); /* The database encoding */
#if !SQLITE_OMIT_PROGRESS_CALLBACK
bool checkProgress; /* True if progress callbacks are enabled */
int nProgressOps = 0; /* Opcodes executed since progress callback. */
#endif
Mem[] aMem = p.aMem; /* Copy of p.aMem */
Mem pIn1 = null; /* 1st input operand */
Mem pIn2 = null; /* 2nd input operand */
Mem pIn3 = null; /* 3rd input operand */
Mem pOut = null; /* Output operand */
int iCompare = 0; /* Result of last OP_Compare operation */
int[] aPermute = null; /* Permutation of columns for OP_Compare */
i64 lastRowid = db.lastRowid; /* Saved value of the last insert ROWID */
#if VDBE_PROFILE
u64 start; /* CPU clock count at start of opcode */
int origPc; /* Program counter at start of opcode */
#endif
/*** INSERT STACK UNION HERE ***/
Debug.Assert(p.magic == VDBE_MAGIC_RUN); /* sqlite3_step() verifies this */
sqlite3VdbeEnter(p);
if (p.rc == SQLITE_NOMEM)
{
/* This happens if a malloc() inside a call to sqlite3_column_text() or
** sqlite3_column_text16() failed. */
goto no_mem;
}
Debug.Assert(p.rc == SQLITE_OK || p.rc == SQLITE_BUSY);
p.rc = SQLITE_OK;
Debug.Assert(p.explain == 0);
p.pResultSet = null;
db.busyHandler.nBusy = 0;
if (db.u1.isInterrupted)
goto abort_due_to_interrupt; //CHECK_FOR_INTERRUPT;
#if TRACE
sqlite3VdbeIOTraceSql( p );
#endif
#if !SQLITE_OMIT_PROGRESS_CALLBACK
checkProgress = db.xProgress != null;
#endif
#if SQLITE_DEBUG
sqlite3BeginBenignMalloc();
if ( p.pc == 0
&& ( p.db.flags & SQLITE_VdbeListing ) != 0 )
{
int i;
Console.Write( "VDBE Program Listing:\n" );
sqlite3VdbePrintSql( p );
for ( i = 0; i < p.nOp; i++ )
{
sqlite3VdbePrintOp( Console.Out, i, aOp[i] );
}
}
sqlite3EndBenignMalloc();
#endif
for (pc = p.pc; rc == SQLITE_OK; pc++)
{
Debug.Assert(pc >= 0 && pc < p.nOp);
// if ( db.mallocFailed != 0 ) goto no_mem;
#if VDBE_PROFILE
origPc = pc;
start = sqlite3Hwtime();
#endif
pOp = aOp[pc];
#if SQLITE_DEBUG
if ( p.trace != null )
{
if ( pc == 0 )
{
printf( "VDBE Execution Trace:\n" );
sqlite3VdbePrintSql( p );
}
sqlite3VdbePrintOp( p.trace, pc, pOp );
}
#endif
/* Check to see if we need to simulate an interrupt. This only happens
** if we have a special test build.
*/
#if SQLITE_TEST
#if !TCLSH
if ( sqlite3_interrupt_count > 0 )
{
sqlite3_interrupt_count--;
if ( sqlite3_interrupt_count == 0 )
#else
if ( sqlite3_interrupt_count.iValue > 0 )
{
sqlite3_interrupt_count.iValue--;
if ( sqlite3_interrupt_count.iValue == 0 )
#endif
{
sqlite3_interrupt( db );
}
}
#endif
#if !SQLITE_OMIT_PROGRESS_CALLBACK
/* Call the progress callback if it is configured and the required number
** of VDBE ops have been executed (either since this invocation of
** sqlite3VdbeExec() or since last time the progress callback was called).
** If the progress callback returns non-zero, exit the virtual machine with
** a return code SQLITE_ABORT.
*/
if (checkProgress)
{
if (db.nProgressOps == nProgressOps)
{
int prc;
prc = db.xProgress(db.pProgressArg);
if (prc != 0)
{
rc = SQLITE_INTERRUPT;
goto vdbe_error_halt;
}
nProgressOps = 0;
}
nProgressOps++;
}
#endif
/* On any opcode with the "out2-prerelase" tag, free any
** external allocations out of mem[p2] and set mem[p2] to be
** an undefined integer. Opcodes will either fill in the integer
** value or convert mem[p2] to a different type.
*/
Debug.Assert(pOp.opflags == sqlite3OpcodeProperty[pOp.opcode]);
if ((pOp.opflags & OPFLG_OUT2_PRERELEASE) != 0)
{
Debug.Assert(pOp.p2 > 0);
Debug.Assert(pOp.p2 <= p.nMem);
pOut = aMem[pOp.p2];
memAboutToChange(p, pOut);
sqlite3VdbeMemReleaseExternal(pOut);
pOut.flags = MEM_Int;
}
/* Sanity checking on other operands */
/* Sanity checking on other operands */
#if SQLITE_DEBUG
if ( ( pOp.opflags & OPFLG_IN1 ) != 0 )
{
Debug.Assert( pOp.p1 > 0 );
Debug.Assert( pOp.p1 <= p.nMem );
Debug.Assert( memIsValid( aMem[pOp.p1] ) );
REGISTER_TRACE( p, pOp.p1, aMem[pOp.p1] );
}
if ( ( pOp.opflags & OPFLG_IN2 ) != 0 )
{
Debug.Assert( pOp.p2 > 0 );
Debug.Assert( pOp.p2 <= p.nMem );
Debug.Assert( memIsValid( aMem[pOp.p2] ) );
REGISTER_TRACE( p, pOp.p2, aMem[pOp.p2] );
}
if ( ( pOp.opflags & OPFLG_IN3 ) != 0 )
{
Debug.Assert( pOp.p3 > 0 );
Debug.Assert( pOp.p3 <= p.nMem );
Debug.Assert( memIsValid( aMem[pOp.p3] ) );
REGISTER_TRACE( p, pOp.p3, aMem[pOp.p3] );
}
if ( ( pOp.opflags & OPFLG_OUT2 ) != 0 )
{
Debug.Assert( pOp.p2 > 0 );
Debug.Assert( pOp.p2 <= p.nMem );
memAboutToChange( p, aMem[pOp.p2] );
}
if ( ( pOp.opflags & OPFLG_OUT3 ) != 0 )
{
Debug.Assert( pOp.p3 > 0 );
Debug.Assert( pOp.p3 <= p.nMem );
memAboutToChange( p, aMem[pOp.p3] );
}
#endif
switch (pOp.opcode)
{
/*****************************************************************************
** What follows is a massive switch statement where each case implements a
** separate instruction in the virtual machine. If we follow the usual
** indentation conventions, each case should be indented by 6 spaces. But
** that is a lot of wasted space on the left margin. So the code within
** the switch statement will break with convention and be flush-left. Another
** big comment (similar to this one) will mark the point in the code where
** we transition back to normal indentation.
**
** The formatting of each case is important. The makefile for SQLite
** generates two C files "opcodes.h" and "opcodes.c" by scanning this
** file looking for lines that begin with "case OP_". The opcodes.h files
** will be filled with #defines that give unique integer values to each
** opcode and the opcodes.c file is filled with an array of strings where
** each string is the symbolic name for the corresponding opcode. If the
** case statement is followed by a comment of the form "/# same as ... #/"
** that comment is used to determine the particular value of the opcode.
**
** Other keywords in the comment that follows each case are used to
** construct the OPFLG_INITIALIZER value that initializes opcodeProperty[].
** Keywords include: in1, in2, in3, ref2_prerelease, ref2, ref3. See
** the mkopcodeh.awk script for additional information.
**
** Documentation about VDBE opcodes is generated by scanning this file
** for lines of that contain "Opcode:". That line and all subsequent
** comment lines are used in the generation of the opcode.html documentation
** file.
**
** SUMMARY:
**
** Formatting is important to scripts that scan this file.
** Do not deviate from the formatting style currently in use.
**
*****************************************************************************/
/* Opcode: Goto * P2 * * *
**
** An unconditional jump to address P2.
** The next instruction executed will be
** the one at index P2 from the beginning of
** the program.
*/
case OP_Goto:
{ /* jump */
if (db.u1.isInterrupted)
goto abort_due_to_interrupt; //CHECK_FOR_INTERRUPT;
pc = pOp.p2 - 1;
break;
}
/* Opcode: Gosub P1 P2 * * *
**
** Write the current address onto register P1
** and then jump to address P2.
*/
case OP_Gosub:
{ /* jump, in1 */
pIn1 = aMem[pOp.p1];
Debug.Assert((pIn1.flags & MEM_Dyn) == 0);
memAboutToChange(p, pIn1);
pIn1.flags = MEM_Int;
pIn1.u.i = pc;
REGISTER_TRACE(p, pOp.p1, pIn1);
pc = pOp.p2 - 1;
break;
}
/* Opcode: Return P1 * * * *
**
** Jump to the next instruction after the address in register P1.
*/
case OP_Return:
{ /* in1 */
pIn1 = aMem[pOp.p1];
Debug.Assert((pIn1.flags & MEM_Int) != 0);
pc = (int)pIn1.u.i;
break;
}
/* Opcode: Yield P1 * * * *
**
** Swap the program counter with the value in register P1.
*/
case OP_Yield: