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sqlcipher/src/vdbeInt.h

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/*
** 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 is the header file for information that is private to the
** VDBE. This information used to all be at the top of the single
** source code file "vdbe.c". When that file became too big (over
** 6000 lines long) it was split up into several smaller files and
** this header information was factored out.
*/
#ifndef _VDBEINT_H_
#define _VDBEINT_H_
/*
** The maximum number of times that a statement will try to reparse
** itself before giving up and returning SQLITE_SCHEMA.
*/
#ifndef SQLITE_MAX_SCHEMA_RETRY
# define SQLITE_MAX_SCHEMA_RETRY 50
#endif
/*
** VDBE_DISPLAY_P4 is true or false depending on whether or not the
** "explain" P4 display logic is enabled.
*/
#if !defined(SQLITE_OMIT_EXPLAIN) || !defined(NDEBUG) \
|| defined(VDBE_PROFILE) || defined(SQLITE_DEBUG)
# define VDBE_DISPLAY_P4 1
#else
# define VDBE_DISPLAY_P4 0
#endif
/*
** SQL is translated into a sequence of instructions to be
** executed by a virtual machine. Each instruction is an instance
** of the following structure.
*/
typedef struct VdbeOp Op;
/*
** Boolean values
*/
typedef unsigned Bool;
/* Opaque type used by code in vdbesort.c */
typedef struct VdbeSorter VdbeSorter;
/* Opaque type used by the explainer */
typedef struct Explain Explain;
/* Elements of the linked list at Vdbe.pAuxData */
typedef struct AuxData AuxData;
/* Types of VDBE cursors */
#define CURTYPE_BTREE 0
#define CURTYPE_SORTER 1
#define CURTYPE_VTAB 2
#define CURTYPE_PSEUDO 3
/*
** A VdbeCursor is an superclass (a wrapper) for various cursor objects:
**
** * A b-tree cursor
** - In the main database or in an ephemeral database
** - On either an index or a table
** * A sorter
** * A virtual table
** * A one-row "pseudotable" stored in a single register
*/
typedef struct VdbeCursor VdbeCursor;
struct VdbeCursor {
u8 eCurType; /* One of the CURTYPE_* values above */
i8 iDb; /* Index of cursor database in db->aDb[] (or -1) */
u8 nullRow; /* True if pointing to a row with no data */
u8 deferredMoveto; /* A call to sqlite3BtreeMoveto() is needed */
u8 isTable; /* True for rowid tables. False for indexes */
#ifdef SQLITE_DEBUG
u8 seekOp; /* Most recent seek operation on this cursor */
u8 wrFlag; /* The wrFlag argument to sqlite3BtreeCursor() */
#endif
Bool isEphemeral:1; /* True for an ephemeral table */
Bool useRandomRowid:1;/* Generate new record numbers semi-randomly */
Bool isOrdered:1; /* True if the underlying table is BTREE_UNORDERED */
Pgno pgnoRoot; /* Root page of the open btree cursor */
i16 nField; /* Number of fields in the header */
u16 nHdrParsed; /* Number of header fields parsed so far */
union {
BtCursor *pCursor; /* CURTYPE_BTREE. Btree cursor */
sqlite3_vtab_cursor *pVCur; /* CURTYPE_VTAB. Vtab cursor */
int pseudoTableReg; /* CURTYPE_PSEUDO. Reg holding content. */
VdbeSorter *pSorter; /* CURTYPE_SORTER. Sorter object */
} uc;
Btree *pBt; /* Separate file holding temporary table */
KeyInfo *pKeyInfo; /* Info about index keys needed by index cursors */
int seekResult; /* Result of previous sqlite3BtreeMoveto() */
i64 seqCount; /* Sequence counter */
i64 movetoTarget; /* Argument to the deferred sqlite3BtreeMoveto() */
VdbeCursor *pAltCursor; /* Associated index cursor from which to read */
int *aAltMap; /* Mapping from table to index column numbers */
#ifdef SQLITE_ENABLE_COLUMN_USED_MASK
u64 maskUsed; /* Mask of columns used by this cursor */
#endif
/* Cached information about the header for the data record that the
** cursor is currently pointing to. Only valid if cacheStatus matches
** Vdbe.cacheCtr. Vdbe.cacheCtr will never take on the value of
** CACHE_STALE and so setting cacheStatus=CACHE_STALE guarantees that
** the cache is out of date.
**
** aRow might point to (ephemeral) data for the current row, or it might
** be NULL.
*/
u32 cacheStatus; /* Cache is valid if this matches Vdbe.cacheCtr */
u32 payloadSize; /* Total number of bytes in the record */
u32 szRow; /* Byte available in aRow */
u32 iHdrOffset; /* Offset to next unparsed byte of the header */
const u8 *aRow; /* Data for the current row, if all on one page */
u32 *aOffset; /* Pointer to aType[nField] */
u32 aType[1]; /* Type values for all entries in the record */
/* 2*nField extra array elements allocated for aType[], beyond the one
** static element declared in the structure. nField total array slots for
** aType[] and nField+1 array slots for aOffset[] */
};
/*
** When a sub-program is executed (OP_Program), a structure of this type
** is allocated to store the current value of the program counter, as
** well as the current memory cell array and various other frame specific
** values stored in the Vdbe struct. When the sub-program is finished,
** these values are copied back to the Vdbe from the VdbeFrame structure,
** restoring the state of the VM to as it was before the sub-program
** began executing.
**
** The memory for a VdbeFrame object is allocated and managed by a memory
** cell in the parent (calling) frame. When the memory cell is deleted or
** overwritten, the VdbeFrame object is not freed immediately. Instead, it
** is linked into the Vdbe.pDelFrame list. The contents of the Vdbe.pDelFrame
** list is deleted when the VM is reset in VdbeHalt(). The reason for doing
** this instead of deleting the VdbeFrame immediately is to avoid recursive
** calls to sqlite3VdbeMemRelease() when the memory cells belonging to the
** child frame are released.
**
** The currently executing frame is stored in Vdbe.pFrame. Vdbe.pFrame is
** set to NULL if the currently executing frame is the main program.
*/
typedef struct VdbeFrame VdbeFrame;
struct VdbeFrame {
Vdbe *v; /* VM this frame belongs to */
VdbeFrame *pParent; /* Parent of this frame, or NULL if parent is main */
Op *aOp; /* Program instructions for parent frame */
i64 *anExec; /* Event counters from parent frame */
Mem *aMem; /* Array of memory cells for parent frame */
u8 *aOnceFlag; /* Array of OP_Once flags for parent frame */
VdbeCursor **apCsr; /* Array of Vdbe cursors for parent frame */
void *token; /* Copy of SubProgram.token */
i64 lastRowid; /* Last insert rowid (sqlite3.lastRowid) */
int nCursor; /* Number of entries in apCsr */
int pc; /* Program Counter in parent (calling) frame */
int nOp; /* Size of aOp array */
int nMem; /* Number of entries in aMem */
int nOnceFlag; /* Number of entries in aOnceFlag */
int nChildMem; /* Number of memory cells for child frame */
int nChildCsr; /* Number of cursors for child frame */
int nChange; /* Statement changes (Vdbe.nChange) */
int nDbChange; /* Value of db->nChange */
};
#define VdbeFrameMem(p) ((Mem *)&((u8 *)p)[ROUND8(sizeof(VdbeFrame))])
/*
** A value for VdbeCursor.cacheValid that means the cache is always invalid.
*/
#define CACHE_STALE 0
/*
** Internally, the vdbe manipulates nearly all SQL values as Mem
** structures. Each Mem struct may cache multiple representations (string,
** integer etc.) of the same value.
*/
struct Mem {
union MemValue {
double r; /* Real value used when MEM_Real is set in flags */
i64 i; /* Integer value used when MEM_Int is set in flags */
int nZero; /* Used when bit MEM_Zero is set in flags */
FuncDef *pDef; /* Used only when flags==MEM_Agg */
RowSet *pRowSet; /* Used only when flags==MEM_RowSet */
VdbeFrame *pFrame; /* Used when flags==MEM_Frame */
} u;
u16 flags; /* Some combination of MEM_Null, MEM_Str, MEM_Dyn, etc. */
u8 enc; /* SQLITE_UTF8, SQLITE_UTF16BE, SQLITE_UTF16LE */
u8 eSubtype; /* Subtype for this value */
int n; /* Number of characters in string value, excluding '\0' */
char *z; /* String or BLOB value */
/* ShallowCopy only needs to copy the information above */
char *zMalloc; /* Space to hold MEM_Str or MEM_Blob if szMalloc>0 */
int szMalloc; /* Size of the zMalloc allocation */
u32 uTemp; /* Transient storage for serial_type in OP_MakeRecord */
sqlite3 *db; /* The associated database connection */
void (*xDel)(void*);/* Destructor for Mem.z - only valid if MEM_Dyn */
#ifdef SQLITE_DEBUG
Mem *pScopyFrom; /* This Mem is a shallow copy of pScopyFrom */
void *pFiller; /* So that sizeof(Mem) is a multiple of 8 */
#endif
};
/*
** Size of struct Mem not including the Mem.zMalloc member or anything that
** follows.
*/
#define MEMCELLSIZE offsetof(Mem,zMalloc)
/* One or more of the following flags are set to indicate the validOK
** representations of the value stored in the Mem struct.
**
** If the MEM_Null flag is set, then the value is an SQL NULL value.
** No other flags may be set in this case.
**
** If the MEM_Str flag is set then Mem.z points at a string representation.
** Usually this is encoded in the same unicode encoding as the main
** database (see below for exceptions). If the MEM_Term flag is also
** set, then the string is nul terminated. The MEM_Int and MEM_Real
** flags may coexist with the MEM_Str flag.
*/
#define MEM_Null 0x0001 /* Value is NULL */
#define MEM_Str 0x0002 /* Value is a string */
#define MEM_Int 0x0004 /* Value is an integer */
#define MEM_Real 0x0008 /* Value is a real number */
#define MEM_Blob 0x0010 /* Value is a BLOB */
#define MEM_AffMask 0x001f /* Mask of affinity bits */
#define MEM_RowSet 0x0020 /* Value is a RowSet object */
#define MEM_Frame 0x0040 /* Value is a VdbeFrame object */
#define MEM_Undefined 0x0080 /* Value is undefined */
#define MEM_Cleared 0x0100 /* NULL set by OP_Null, not from data */
#define MEM_TypeMask 0x81ff /* Mask of type bits */
/* Whenever Mem contains a valid string or blob representation, one of
** the following flags must be set to determine the memory management
** policy for Mem.z. The MEM_Term flag tells us whether or not the
** string is \000 or \u0000 terminated
*/
#define MEM_Term 0x0200 /* String rep is nul terminated */
#define MEM_Dyn 0x0400 /* Need to call Mem.xDel() on Mem.z */
#define MEM_Static 0x0800 /* Mem.z points to a static string */
#define MEM_Ephem 0x1000 /* Mem.z points to an ephemeral string */
#define MEM_Agg 0x2000 /* Mem.z points to an agg function context */
#define MEM_Zero 0x4000 /* Mem.i contains count of 0s appended to blob */
#define MEM_Subtype 0x8000 /* Mem.eSubtype is valid */
#ifdef SQLITE_OMIT_INCRBLOB
#undef MEM_Zero
#define MEM_Zero 0x0000
#endif
/* Return TRUE if Mem X contains dynamically allocated content - anything
** that needs to be deallocated to avoid a leak.
*/
#define VdbeMemDynamic(X) \
(((X)->flags&(MEM_Agg|MEM_Dyn|MEM_RowSet|MEM_Frame))!=0)
/*
** Clear any existing type flags from a Mem and replace them with f
*/
#define MemSetTypeFlag(p, f) \
((p)->flags = ((p)->flags&~(MEM_TypeMask|MEM_Zero))|f)
/*
** Return true if a memory cell is not marked as invalid. This macro
** is for use inside assert() statements only.
*/
#ifdef SQLITE_DEBUG
#define memIsValid(M) ((M)->flags & MEM_Undefined)==0
#endif
/*
** Each auxiliary data pointer stored by a user defined function
** implementation calling sqlite3_set_auxdata() is stored in an instance
** of this structure. All such structures associated with a single VM
** are stored in a linked list headed at Vdbe.pAuxData. All are destroyed
** when the VM is halted (if not before).
*/
struct AuxData {
int iOp; /* Instruction number of OP_Function opcode */
int iArg; /* Index of function argument. */
void *pAux; /* Aux data pointer */
void (*xDelete)(void *); /* Destructor for the aux data */
AuxData *pNext; /* Next element in list */
};
/*
** The "context" argument for an installable function. A pointer to an
** instance of this structure is the first argument to the routines used
** implement the SQL functions.
**
** There is a typedef for this structure in sqlite.h. So all routines,
** even the public interface to SQLite, can use a pointer to this structure.
** But this file is the only place where the internal details of this
** structure are known.
**
** This structure is defined inside of vdbeInt.h because it uses substructures
** (Mem) which are only defined there.
*/
struct sqlite3_context {
Mem *pOut; /* The return value is stored here */
FuncDef *pFunc; /* Pointer to function information */
Mem *pMem; /* Memory cell used to store aggregate context */
Vdbe *pVdbe; /* The VM that owns this context */
int iOp; /* Instruction number of OP_Function */
int isError; /* Error code returned by the function. */
u8 skipFlag; /* Skip accumulator loading if true */
u8 fErrorOrAux; /* isError!=0 or pVdbe->pAuxData modified */
u8 argc; /* Number of arguments */
sqlite3_value *argv[1]; /* Argument set */
};
/*
** An Explain object accumulates indented output which is helpful
** in describing recursive data structures.
*/
struct Explain {
Vdbe *pVdbe; /* Attach the explanation to this Vdbe */
StrAccum str; /* The string being accumulated */
int nIndent; /* Number of elements in aIndent */
u16 aIndent[100]; /* Levels of indentation */
char zBase[100]; /* Initial space */
};
/* A bitfield type for use inside of structures. Always follow with :N where
** N is the number of bits.
*/
typedef unsigned bft; /* Bit Field Type */
typedef struct ScanStatus ScanStatus;
struct ScanStatus {
int addrExplain; /* OP_Explain for loop */
int addrLoop; /* Address of "loops" counter */
int addrVisit; /* Address of "rows visited" counter */
int iSelectID; /* The "Select-ID" for this loop */
LogEst nEst; /* Estimated output rows per loop */
char *zName; /* Name of table or index */
};
/*
** An instance of the virtual machine. This structure contains the complete
** state of the virtual machine.
**
** The "sqlite3_stmt" structure pointer that is returned by sqlite3_prepare()
** is really a pointer to an instance of this structure.
*/
struct Vdbe {
sqlite3 *db; /* The database connection that owns this statement */
Op *aOp; /* Space to hold the virtual machine's program */
Mem *aMem; /* The memory locations */
Mem **apArg; /* Arguments to currently executing user function */
Mem *aColName; /* Column names to return */
Mem *pResultSet; /* Pointer to an array of results */
Parse *pParse; /* Parsing context used to create this Vdbe */
int nMem; /* Number of memory locations currently allocated */
int nOp; /* Number of instructions in the program */
int nCursor; /* Number of slots in apCsr[] */
u32 magic; /* Magic number for sanity checking */
char *zErrMsg; /* Error message written here */
Vdbe *pPrev,*pNext; /* Linked list of VDBEs with the same Vdbe.db */
VdbeCursor **apCsr; /* One element of this array for each open cursor */
Mem *aVar; /* Values for the OP_Variable opcode. */
char **azVar; /* Name of variables */
ynVar nVar; /* Number of entries in aVar[] */
ynVar nzVar; /* Number of entries in azVar[] */
u32 cacheCtr; /* VdbeCursor row cache generation counter */
int pc; /* The program counter */
int rc; /* Value to return */
#ifdef SQLITE_DEBUG
int rcApp; /* errcode set by sqlite3_result_error_code() */
#endif
u16 nResColumn; /* Number of columns in one row of the result set */
u8 errorAction; /* Recovery action to do in case of an error */
u8 minWriteFileFormat; /* Minimum file format for writable database files */
bft explain:2; /* True if EXPLAIN present on SQL command */
bft changeCntOn:1; /* True to update the change-counter */
bft expired:1; /* True if the VM needs to be recompiled */
bft runOnlyOnce:1; /* Automatically expire on reset */
bft usesStmtJournal:1; /* True if uses a statement journal */
bft readOnly:1; /* True for statements that do not write */
bft bIsReader:1; /* True for statements that read */
bft isPrepareV2:1; /* True if prepared with prepare_v2() */
bft doingRerun:1; /* True if rerunning after an auto-reprepare */
int nChange; /* Number of db changes made since last reset */
yDbMask btreeMask; /* Bitmask of db->aDb[] entries referenced */
yDbMask lockMask; /* Subset of btreeMask that requires a lock */
int iStatement; /* Statement number (or 0 if has not opened stmt) */
u32 aCounter[5]; /* Counters used by sqlite3_stmt_status() */
#ifndef SQLITE_OMIT_TRACE
i64 startTime; /* Time when query started - used for profiling */
#endif
i64 iCurrentTime; /* Value of julianday('now') for this statement */
i64 nFkConstraint; /* Number of imm. FK constraints this VM */
i64 nStmtDefCons; /* Number of def. constraints when stmt started */
i64 nStmtDefImmCons; /* Number of def. imm constraints when stmt started */
char *zSql; /* Text of the SQL statement that generated this */
void *pFree; /* Free this when deleting the vdbe */
VdbeFrame *pFrame; /* Parent frame */
VdbeFrame *pDelFrame; /* List of frame objects to free on VM reset */
int nFrame; /* Number of frames in pFrame list */
u32 expmask; /* Binding to these vars invalidates VM */
SubProgram *pProgram; /* Linked list of all sub-programs used by VM */
int nOnceFlag; /* Size of array aOnceFlag[] */
u8 *aOnceFlag; /* Flags for OP_Once */
AuxData *pAuxData; /* Linked list of auxdata allocations */
#ifdef SQLITE_ENABLE_STMT_SCANSTATUS
i64 *anExec; /* Number of times each op has been executed */
int nScan; /* Entries in aScan[] */
ScanStatus *aScan; /* Scan definitions for sqlite3_stmt_scanstatus() */
#endif
};
/*
** The following are allowed values for Vdbe.magic
*/
#define VDBE_MAGIC_INIT 0x26bceaa5 /* Building a VDBE program */
#define VDBE_MAGIC_RUN 0xbdf20da3 /* VDBE is ready to execute */
#define VDBE_MAGIC_HALT 0x519c2973 /* VDBE has completed execution */
#define VDBE_MAGIC_DEAD 0xb606c3c8 /* The VDBE has been deallocated */
/*
** Function prototypes
*/
void sqlite3VdbeError(Vdbe*, const char *, ...);
void sqlite3VdbeFreeCursor(Vdbe *, VdbeCursor*);
void sqliteVdbePopStack(Vdbe*,int);
int sqlite3VdbeCursorMoveto(VdbeCursor**, int*);
int sqlite3VdbeCursorRestore(VdbeCursor*);
#if defined(SQLITE_DEBUG) || defined(VDBE_PROFILE)
void sqlite3VdbePrintOp(FILE*, int, Op*);
#endif
u32 sqlite3VdbeSerialTypeLen(u32);
u8 sqlite3VdbeOneByteSerialTypeLen(u8);
u32 sqlite3VdbeSerialType(Mem*, int, u32*);
u32 sqlite3VdbeSerialPut(unsigned char*, Mem*, u32);
u32 sqlite3VdbeSerialGet(const unsigned char*, u32, Mem*);
void sqlite3VdbeDeleteAuxData(Vdbe*, int, int);
int sqlite2BtreeKeyCompare(BtCursor *, const void *, int, int, int *);
int sqlite3VdbeIdxKeyCompare(sqlite3*,VdbeCursor*,UnpackedRecord*,int*);
int sqlite3VdbeIdxRowid(sqlite3*, BtCursor*, i64*);
int sqlite3VdbeExec(Vdbe*);
int sqlite3VdbeList(Vdbe*);
int sqlite3VdbeHalt(Vdbe*);
int sqlite3VdbeChangeEncoding(Mem *, int);
int sqlite3VdbeMemTooBig(Mem*);
int sqlite3VdbeMemCopy(Mem*, const Mem*);
void sqlite3VdbeMemShallowCopy(Mem*, const Mem*, int);
void sqlite3VdbeMemMove(Mem*, Mem*);
int sqlite3VdbeMemNulTerminate(Mem*);
int sqlite3VdbeMemSetStr(Mem*, const char*, int, u8, void(*)(void*));
void sqlite3VdbeMemSetInt64(Mem*, i64);
#ifdef SQLITE_OMIT_FLOATING_POINT
# define sqlite3VdbeMemSetDouble sqlite3VdbeMemSetInt64
#else
void sqlite3VdbeMemSetDouble(Mem*, double);
#endif
void sqlite3VdbeMemInit(Mem*,sqlite3*,u16);
void sqlite3VdbeMemSetNull(Mem*);
void sqlite3VdbeMemSetZeroBlob(Mem*,int);
void sqlite3VdbeMemSetRowSet(Mem*);
int sqlite3VdbeMemMakeWriteable(Mem*);
int sqlite3VdbeMemStringify(Mem*, u8, u8);
i64 sqlite3VdbeIntValue(Mem*);
int sqlite3VdbeMemIntegerify(Mem*);
double sqlite3VdbeRealValue(Mem*);
void sqlite3VdbeIntegerAffinity(Mem*);
int sqlite3VdbeMemRealify(Mem*);
int sqlite3VdbeMemNumerify(Mem*);
void sqlite3VdbeMemCast(Mem*,u8,u8);
int sqlite3VdbeMemFromBtree(BtCursor*,u32,u32,int,Mem*);
void sqlite3VdbeMemRelease(Mem *p);
int sqlite3VdbeMemFinalize(Mem*, FuncDef*);
const char *sqlite3OpcodeName(int);
int sqlite3VdbeMemGrow(Mem *pMem, int n, int preserve);
int sqlite3VdbeMemClearAndResize(Mem *pMem, int n);
int sqlite3VdbeCloseStatement(Vdbe *, int);
void sqlite3VdbeFrameDelete(VdbeFrame*);
int sqlite3VdbeFrameRestore(VdbeFrame *);
int sqlite3VdbeTransferError(Vdbe *p);
int sqlite3VdbeSorterInit(sqlite3 *, int, VdbeCursor *);
void sqlite3VdbeSorterReset(sqlite3 *, VdbeSorter *);
void sqlite3VdbeSorterClose(sqlite3 *, VdbeCursor *);
int sqlite3VdbeSorterRowkey(const VdbeCursor *, Mem *);
int sqlite3VdbeSorterNext(sqlite3 *, const VdbeCursor *, int *);
int sqlite3VdbeSorterRewind(const VdbeCursor *, int *);
int sqlite3VdbeSorterWrite(const VdbeCursor *, Mem *);
int sqlite3VdbeSorterCompare(const VdbeCursor *, Mem *, int, int *);
#if !defined(SQLITE_OMIT_SHARED_CACHE)
void sqlite3VdbeEnter(Vdbe*);
#else
# define sqlite3VdbeEnter(X)
#endif
#if !defined(SQLITE_OMIT_SHARED_CACHE) && SQLITE_THREADSAFE>0
void sqlite3VdbeLeave(Vdbe*);
#else
# define sqlite3VdbeLeave(X)
#endif
#ifdef SQLITE_DEBUG
void sqlite3VdbeMemAboutToChange(Vdbe*,Mem*);
int sqlite3VdbeCheckMemInvariants(Mem*);
#endif
#ifndef SQLITE_OMIT_FOREIGN_KEY
int sqlite3VdbeCheckFk(Vdbe *, int);
#else
# define sqlite3VdbeCheckFk(p,i) 0
#endif
int sqlite3VdbeMemTranslate(Mem*, u8);
#ifdef SQLITE_DEBUG
void sqlite3VdbePrintSql(Vdbe*);
void sqlite3VdbeMemPrettyPrint(Mem *pMem, char *zBuf);
#endif
int sqlite3VdbeMemHandleBom(Mem *pMem);
#ifndef SQLITE_OMIT_INCRBLOB
int sqlite3VdbeMemExpandBlob(Mem *);
#define ExpandBlob(P) (((P)->flags&MEM_Zero)?sqlite3VdbeMemExpandBlob(P):0)
#else
#define sqlite3VdbeMemExpandBlob(x) SQLITE_OK
#define ExpandBlob(P) SQLITE_OK
#endif
#endif /* !defined(_VDBEINT_H_) */
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