modernc.org/cc@v1.0.1/v2/testdata/_sqlite/src/vdbeInt.h (about)

     1  /*
     2  ** 2003 September 6
     3  **
     4  ** The author disclaims copyright to this source code.  In place of
     5  ** a legal notice, here is a blessing:
     6  **
     7  **    May you do good and not evil.
     8  **    May you find forgiveness for yourself and forgive others.
     9  **    May you share freely, never taking more than you give.
    10  **
    11  *************************************************************************
    12  ** This is the header file for information that is private to the
    13  ** VDBE.  This information used to all be at the top of the single
    14  ** source code file "vdbe.c".  When that file became too big (over
    15  ** 6000 lines long) it was split up into several smaller files and
    16  ** this header information was factored out.
    17  */
    18  #ifndef SQLITE_VDBEINT_H
    19  #define SQLITE_VDBEINT_H
    20  
    21  /*
    22  ** The maximum number of times that a statement will try to reparse
    23  ** itself before giving up and returning SQLITE_SCHEMA.
    24  */
    25  #ifndef SQLITE_MAX_SCHEMA_RETRY
    26  # define SQLITE_MAX_SCHEMA_RETRY 50
    27  #endif
    28  
    29  /*
    30  ** VDBE_DISPLAY_P4 is true or false depending on whether or not the
    31  ** "explain" P4 display logic is enabled.
    32  */
    33  #if !defined(SQLITE_OMIT_EXPLAIN) || !defined(NDEBUG) \
    34       || defined(VDBE_PROFILE) || defined(SQLITE_DEBUG)
    35  # define VDBE_DISPLAY_P4 1
    36  #else
    37  # define VDBE_DISPLAY_P4 0
    38  #endif
    39  
    40  /*
    41  ** SQL is translated into a sequence of instructions to be
    42  ** executed by a virtual machine.  Each instruction is an instance
    43  ** of the following structure.
    44  */
    45  typedef struct VdbeOp Op;
    46  
    47  /*
    48  ** Boolean values
    49  */
    50  typedef unsigned Bool;
    51  
    52  /* Opaque type used by code in vdbesort.c */
    53  typedef struct VdbeSorter VdbeSorter;
    54  
    55  /* Elements of the linked list at Vdbe.pAuxData */
    56  typedef struct AuxData AuxData;
    57  
    58  /* Types of VDBE cursors */
    59  #define CURTYPE_BTREE       0
    60  #define CURTYPE_SORTER      1
    61  #define CURTYPE_VTAB        2
    62  #define CURTYPE_PSEUDO      3
    63  
    64  /*
    65  ** A VdbeCursor is an superclass (a wrapper) for various cursor objects:
    66  **
    67  **      * A b-tree cursor
    68  **          -  In the main database or in an ephemeral database
    69  **          -  On either an index or a table
    70  **      * A sorter
    71  **      * A virtual table
    72  **      * A one-row "pseudotable" stored in a single register
    73  */
    74  typedef struct VdbeCursor VdbeCursor;
    75  struct VdbeCursor {
    76    u8 eCurType;            /* One of the CURTYPE_* values above */
    77    i8 iDb;                 /* Index of cursor database in db->aDb[] (or -1) */
    78    u8 nullRow;             /* True if pointing to a row with no data */
    79    u8 deferredMoveto;      /* A call to sqlite3BtreeMoveto() is needed */
    80    u8 isTable;             /* True for rowid tables.  False for indexes */
    81  #ifdef SQLITE_DEBUG
    82    u8 seekOp;              /* Most recent seek operation on this cursor */
    83    u8 wrFlag;              /* The wrFlag argument to sqlite3BtreeCursor() */
    84  #endif
    85    Bool isEphemeral:1;     /* True for an ephemeral table */
    86    Bool useRandomRowid:1;  /* Generate new record numbers semi-randomly */
    87    Bool isOrdered:1;       /* True if the table is not BTREE_UNORDERED */
    88    Btree *pBtx;            /* Separate file holding temporary table */
    89    i64 seqCount;           /* Sequence counter */
    90    int *aAltMap;           /* Mapping from table to index column numbers */
    91  
    92    /* Cached OP_Column parse information is only valid if cacheStatus matches
    93    ** Vdbe.cacheCtr.  Vdbe.cacheCtr will never take on the value of
    94    ** CACHE_STALE (0) and so setting cacheStatus=CACHE_STALE guarantees that
    95    ** the cache is out of date. */
    96    u32 cacheStatus;        /* Cache is valid if this matches Vdbe.cacheCtr */
    97    int seekResult;         /* Result of previous sqlite3BtreeMoveto() or 0
    98                            ** if there have been no prior seeks on the cursor. */
    99    /* seekResult does not distinguish between "no seeks have ever occurred
   100    ** on this cursor" and "the most recent seek was an exact match".
   101    ** For CURTYPE_PSEUDO, seekResult is the register holding the record */
   102  
   103    /* When a new VdbeCursor is allocated, only the fields above are zeroed.
   104    ** The fields that follow are uninitialized, and must be individually
   105    ** initialized prior to first use. */
   106    VdbeCursor *pAltCursor; /* Associated index cursor from which to read */
   107    union {
   108      BtCursor *pCursor;          /* CURTYPE_BTREE or _PSEUDO.  Btree cursor */
   109      sqlite3_vtab_cursor *pVCur; /* CURTYPE_VTAB.              Vtab cursor */
   110      VdbeSorter *pSorter;        /* CURTYPE_SORTER.            Sorter object */
   111    } uc;
   112    KeyInfo *pKeyInfo;      /* Info about index keys needed by index cursors */
   113    u32 iHdrOffset;         /* Offset to next unparsed byte of the header */
   114    Pgno pgnoRoot;          /* Root page of the open btree cursor */
   115    i16 nField;             /* Number of fields in the header */
   116    u16 nHdrParsed;         /* Number of header fields parsed so far */
   117    i64 movetoTarget;       /* Argument to the deferred sqlite3BtreeMoveto() */
   118    u32 *aOffset;           /* Pointer to aType[nField] */
   119    const u8 *aRow;         /* Data for the current row, if all on one page */
   120    u32 payloadSize;        /* Total number of bytes in the record */
   121    u32 szRow;              /* Byte available in aRow */
   122  #ifdef SQLITE_ENABLE_COLUMN_USED_MASK
   123    u64 maskUsed;           /* Mask of columns used by this cursor */
   124  #endif
   125  
   126    /* 2*nField extra array elements allocated for aType[], beyond the one
   127    ** static element declared in the structure.  nField total array slots for
   128    ** aType[] and nField+1 array slots for aOffset[] */
   129    u32 aType[1];           /* Type values record decode.  MUST BE LAST */
   130  };
   131  
   132  
   133  /*
   134  ** A value for VdbeCursor.cacheStatus that means the cache is always invalid.
   135  */
   136  #define CACHE_STALE 0
   137  
   138  /*
   139  ** When a sub-program is executed (OP_Program), a structure of this type
   140  ** is allocated to store the current value of the program counter, as
   141  ** well as the current memory cell array and various other frame specific
   142  ** values stored in the Vdbe struct. When the sub-program is finished, 
   143  ** these values are copied back to the Vdbe from the VdbeFrame structure,
   144  ** restoring the state of the VM to as it was before the sub-program
   145  ** began executing.
   146  **
   147  ** The memory for a VdbeFrame object is allocated and managed by a memory
   148  ** cell in the parent (calling) frame. When the memory cell is deleted or
   149  ** overwritten, the VdbeFrame object is not freed immediately. Instead, it
   150  ** is linked into the Vdbe.pDelFrame list. The contents of the Vdbe.pDelFrame
   151  ** list is deleted when the VM is reset in VdbeHalt(). The reason for doing
   152  ** this instead of deleting the VdbeFrame immediately is to avoid recursive
   153  ** calls to sqlite3VdbeMemRelease() when the memory cells belonging to the
   154  ** child frame are released.
   155  **
   156  ** The currently executing frame is stored in Vdbe.pFrame. Vdbe.pFrame is
   157  ** set to NULL if the currently executing frame is the main program.
   158  */
   159  typedef struct VdbeFrame VdbeFrame;
   160  struct VdbeFrame {
   161    Vdbe *v;                /* VM this frame belongs to */
   162    VdbeFrame *pParent;     /* Parent of this frame, or NULL if parent is main */
   163    Op *aOp;                /* Program instructions for parent frame */
   164    i64 *anExec;            /* Event counters from parent frame */
   165    Mem *aMem;              /* Array of memory cells for parent frame */
   166    VdbeCursor **apCsr;     /* Array of Vdbe cursors for parent frame */
   167    u8 *aOnce;              /* Bitmask used by OP_Once */
   168    void *token;            /* Copy of SubProgram.token */
   169    i64 lastRowid;          /* Last insert rowid (sqlite3.lastRowid) */
   170    AuxData *pAuxData;      /* Linked list of auxdata allocations */
   171    int nCursor;            /* Number of entries in apCsr */
   172    int pc;                 /* Program Counter in parent (calling) frame */
   173    int nOp;                /* Size of aOp array */
   174    int nMem;               /* Number of entries in aMem */
   175    int nChildMem;          /* Number of memory cells for child frame */
   176    int nChildCsr;          /* Number of cursors for child frame */
   177    int nChange;            /* Statement changes (Vdbe.nChange)     */
   178    int nDbChange;          /* Value of db->nChange */
   179  };
   180  
   181  #define VdbeFrameMem(p) ((Mem *)&((u8 *)p)[ROUND8(sizeof(VdbeFrame))])
   182  
   183  /*
   184  ** Internally, the vdbe manipulates nearly all SQL values as Mem
   185  ** structures. Each Mem struct may cache multiple representations (string,
   186  ** integer etc.) of the same value.
   187  */
   188  struct sqlite3_value {
   189    union MemValue {
   190      double r;           /* Real value used when MEM_Real is set in flags */
   191      i64 i;              /* Integer value used when MEM_Int is set in flags */
   192      int nZero;          /* Extra zero bytes when MEM_Zero and MEM_Blob set */
   193      const char *zPType; /* Pointer type when MEM_Term|MEM_Subtype|MEM_Null */
   194      FuncDef *pDef;      /* Used only when flags==MEM_Agg */
   195      RowSet *pRowSet;    /* Used only when flags==MEM_RowSet */
   196      VdbeFrame *pFrame;  /* Used when flags==MEM_Frame */
   197    } u;
   198    u16 flags;          /* Some combination of MEM_Null, MEM_Str, MEM_Dyn, etc. */
   199    u8  enc;            /* SQLITE_UTF8, SQLITE_UTF16BE, SQLITE_UTF16LE */
   200    u8  eSubtype;       /* Subtype for this value */
   201    int n;              /* Number of characters in string value, excluding '\0' */
   202    char *z;            /* String or BLOB value */
   203    /* ShallowCopy only needs to copy the information above */
   204    char *zMalloc;      /* Space to hold MEM_Str or MEM_Blob if szMalloc>0 */
   205    int szMalloc;       /* Size of the zMalloc allocation */
   206    u32 uTemp;          /* Transient storage for serial_type in OP_MakeRecord */
   207    sqlite3 *db;        /* The associated database connection */
   208    void (*xDel)(void*);/* Destructor for Mem.z - only valid if MEM_Dyn */
   209  #ifdef SQLITE_DEBUG
   210    Mem *pScopyFrom;    /* This Mem is a shallow copy of pScopyFrom */
   211    void *pFiller;      /* So that sizeof(Mem) is a multiple of 8 */
   212  #endif
   213  };
   214  
   215  /*
   216  ** Size of struct Mem not including the Mem.zMalloc member or anything that
   217  ** follows.
   218  */
   219  #define MEMCELLSIZE offsetof(Mem,zMalloc)
   220  
   221  /* One or more of the following flags are set to indicate the validOK
   222  ** representations of the value stored in the Mem struct.
   223  **
   224  ** If the MEM_Null flag is set, then the value is an SQL NULL value.
   225  ** For a pointer type created using sqlite3_bind_pointer() or
   226  ** sqlite3_result_pointer() the MEM_Term and MEM_Subtype flags are also set.
   227  **
   228  ** If the MEM_Str flag is set then Mem.z points at a string representation.
   229  ** Usually this is encoded in the same unicode encoding as the main
   230  ** database (see below for exceptions). If the MEM_Term flag is also
   231  ** set, then the string is nul terminated. The MEM_Int and MEM_Real 
   232  ** flags may coexist with the MEM_Str flag.
   233  */
   234  #define MEM_Null      0x0001   /* Value is NULL (or a pointer) */
   235  #define MEM_Str       0x0002   /* Value is a string */
   236  #define MEM_Int       0x0004   /* Value is an integer */
   237  #define MEM_Real      0x0008   /* Value is a real number */
   238  #define MEM_Blob      0x0010   /* Value is a BLOB */
   239  #define MEM_AffMask   0x001f   /* Mask of affinity bits */
   240  #define MEM_RowSet    0x0020   /* Value is a RowSet object */
   241  #define MEM_Frame     0x0040   /* Value is a VdbeFrame object */
   242  #define MEM_Undefined 0x0080   /* Value is undefined */
   243  #define MEM_Cleared   0x0100   /* NULL set by OP_Null, not from data */
   244  #define MEM_TypeMask  0xc1ff   /* Mask of type bits */
   245  
   246  
   247  /* Whenever Mem contains a valid string or blob representation, one of
   248  ** the following flags must be set to determine the memory management
   249  ** policy for Mem.z.  The MEM_Term flag tells us whether or not the
   250  ** string is \000 or \u0000 terminated
   251  */
   252  #define MEM_Term      0x0200   /* String in Mem.z is zero terminated */
   253  #define MEM_Dyn       0x0400   /* Need to call Mem.xDel() on Mem.z */
   254  #define MEM_Static    0x0800   /* Mem.z points to a static string */
   255  #define MEM_Ephem     0x1000   /* Mem.z points to an ephemeral string */
   256  #define MEM_Agg       0x2000   /* Mem.z points to an agg function context */
   257  #define MEM_Zero      0x4000   /* Mem.i contains count of 0s appended to blob */
   258  #define MEM_Subtype   0x8000   /* Mem.eSubtype is valid */
   259  #ifdef SQLITE_OMIT_INCRBLOB
   260    #undef MEM_Zero
   261    #define MEM_Zero 0x0000
   262  #endif
   263  
   264  /* Return TRUE if Mem X contains dynamically allocated content - anything
   265  ** that needs to be deallocated to avoid a leak.
   266  */
   267  #define VdbeMemDynamic(X)  \
   268    (((X)->flags&(MEM_Agg|MEM_Dyn|MEM_RowSet|MEM_Frame))!=0)
   269  
   270  /*
   271  ** Clear any existing type flags from a Mem and replace them with f
   272  */
   273  #define MemSetTypeFlag(p, f) \
   274     ((p)->flags = ((p)->flags&~(MEM_TypeMask|MEM_Zero))|f)
   275  
   276  /*
   277  ** Return true if a memory cell is not marked as invalid.  This macro
   278  ** is for use inside assert() statements only.
   279  */
   280  #ifdef SQLITE_DEBUG
   281  #define memIsValid(M)  ((M)->flags & MEM_Undefined)==0
   282  #endif
   283  
   284  /*
   285  ** Each auxiliary data pointer stored by a user defined function 
   286  ** implementation calling sqlite3_set_auxdata() is stored in an instance
   287  ** of this structure. All such structures associated with a single VM
   288  ** are stored in a linked list headed at Vdbe.pAuxData. All are destroyed
   289  ** when the VM is halted (if not before).
   290  */
   291  struct AuxData {
   292    int iAuxOp;                     /* Instruction number of OP_Function opcode */
   293    int iAuxArg;                    /* Index of function argument. */
   294    void *pAux;                     /* Aux data pointer */
   295    void (*xDeleteAux)(void*);      /* Destructor for the aux data */
   296    AuxData *pNextAux;              /* Next element in list */
   297  };
   298  
   299  /*
   300  ** The "context" argument for an installable function.  A pointer to an
   301  ** instance of this structure is the first argument to the routines used
   302  ** implement the SQL functions.
   303  **
   304  ** There is a typedef for this structure in sqlite.h.  So all routines,
   305  ** even the public interface to SQLite, can use a pointer to this structure.
   306  ** But this file is the only place where the internal details of this
   307  ** structure are known.
   308  **
   309  ** This structure is defined inside of vdbeInt.h because it uses substructures
   310  ** (Mem) which are only defined there.
   311  */
   312  struct sqlite3_context {
   313    Mem *pOut;              /* The return value is stored here */
   314    FuncDef *pFunc;         /* Pointer to function information */
   315    Mem *pMem;              /* Memory cell used to store aggregate context */
   316    Vdbe *pVdbe;            /* The VM that owns this context */
   317    int iOp;                /* Instruction number of OP_Function */
   318    int isError;            /* Error code returned by the function. */
   319    u8 skipFlag;            /* Skip accumulator loading if true */
   320    u8 fErrorOrAux;         /* isError!=0 or pVdbe->pAuxData modified */
   321    u8 argc;                /* Number of arguments */
   322    sqlite3_value *argv[1]; /* Argument set */
   323  };
   324  
   325  /* A bitfield type for use inside of structures.  Always follow with :N where
   326  ** N is the number of bits.
   327  */
   328  typedef unsigned bft;  /* Bit Field Type */
   329  
   330  typedef struct ScanStatus ScanStatus;
   331  struct ScanStatus {
   332    int addrExplain;                /* OP_Explain for loop */
   333    int addrLoop;                   /* Address of "loops" counter */
   334    int addrVisit;                  /* Address of "rows visited" counter */
   335    int iSelectID;                  /* The "Select-ID" for this loop */
   336    LogEst nEst;                    /* Estimated output rows per loop */
   337    char *zName;                    /* Name of table or index */
   338  };
   339  
   340  /*
   341  ** An instance of the virtual machine.  This structure contains the complete
   342  ** state of the virtual machine.
   343  **
   344  ** The "sqlite3_stmt" structure pointer that is returned by sqlite3_prepare()
   345  ** is really a pointer to an instance of this structure.
   346  */
   347  struct Vdbe {
   348    sqlite3 *db;            /* The database connection that owns this statement */
   349    Vdbe *pPrev,*pNext;     /* Linked list of VDBEs with the same Vdbe.db */
   350    Parse *pParse;          /* Parsing context used to create this Vdbe */
   351    ynVar nVar;             /* Number of entries in aVar[] */
   352    u32 magic;              /* Magic number for sanity checking */
   353    int nMem;               /* Number of memory locations currently allocated */
   354    int nCursor;            /* Number of slots in apCsr[] */
   355    u32 cacheCtr;           /* VdbeCursor row cache generation counter */
   356    int pc;                 /* The program counter */
   357    int rc;                 /* Value to return */
   358    int nChange;            /* Number of db changes made since last reset */
   359    int iStatement;         /* Statement number (or 0 if has not opened stmt) */
   360    i64 iCurrentTime;       /* Value of julianday('now') for this statement */
   361    i64 nFkConstraint;      /* Number of imm. FK constraints this VM */
   362    i64 nStmtDefCons;       /* Number of def. constraints when stmt started */
   363    i64 nStmtDefImmCons;    /* Number of def. imm constraints when stmt started */
   364  
   365    /* When allocating a new Vdbe object, all of the fields below should be
   366    ** initialized to zero or NULL */
   367  
   368    Op *aOp;                /* Space to hold the virtual machine's program */
   369    Mem *aMem;              /* The memory locations */
   370    Mem **apArg;            /* Arguments to currently executing user function */
   371    Mem *aColName;          /* Column names to return */
   372    Mem *pResultSet;        /* Pointer to an array of results */
   373    char *zErrMsg;          /* Error message written here */
   374    VdbeCursor **apCsr;     /* One element of this array for each open cursor */
   375    Mem *aVar;              /* Values for the OP_Variable opcode. */
   376    VList *pVList;          /* Name of variables */
   377  #ifndef SQLITE_OMIT_TRACE
   378    i64 startTime;          /* Time when query started - used for profiling */
   379  #endif
   380    int nOp;                /* Number of instructions in the program */
   381  #ifdef SQLITE_DEBUG
   382    int rcApp;              /* errcode set by sqlite3_result_error_code() */
   383  #endif
   384    u16 nResColumn;         /* Number of columns in one row of the result set */
   385    u8 errorAction;         /* Recovery action to do in case of an error */
   386    u8 minWriteFileFormat;  /* Minimum file format for writable database files */
   387    u8 prepFlags;           /* SQLITE_PREPARE_* flags */
   388    bft expired:1;          /* True if the VM needs to be recompiled */
   389    bft doingRerun:1;       /* True if rerunning after an auto-reprepare */
   390    bft explain:2;          /* True if EXPLAIN present on SQL command */
   391    bft changeCntOn:1;      /* True to update the change-counter */
   392    bft runOnlyOnce:1;      /* Automatically expire on reset */
   393    bft usesStmtJournal:1;  /* True if uses a statement journal */
   394    bft readOnly:1;         /* True for statements that do not write */
   395    bft bIsReader:1;        /* True for statements that read */
   396    yDbMask btreeMask;      /* Bitmask of db->aDb[] entries referenced */
   397    yDbMask lockMask;       /* Subset of btreeMask that requires a lock */
   398    u32 aCounter[7];        /* Counters used by sqlite3_stmt_status() */
   399    char *zSql;             /* Text of the SQL statement that generated this */
   400    void *pFree;            /* Free this when deleting the vdbe */
   401    VdbeFrame *pFrame;      /* Parent frame */
   402    VdbeFrame *pDelFrame;   /* List of frame objects to free on VM reset */
   403    int nFrame;             /* Number of frames in pFrame list */
   404    u32 expmask;            /* Binding to these vars invalidates VM */
   405    SubProgram *pProgram;   /* Linked list of all sub-programs used by VM */
   406    AuxData *pAuxData;      /* Linked list of auxdata allocations */
   407  #ifdef SQLITE_ENABLE_STMT_SCANSTATUS
   408    i64 *anExec;            /* Number of times each op has been executed */
   409    int nScan;              /* Entries in aScan[] */
   410    ScanStatus *aScan;      /* Scan definitions for sqlite3_stmt_scanstatus() */
   411  #endif
   412  };
   413  
   414  /*
   415  ** The following are allowed values for Vdbe.magic
   416  */
   417  #define VDBE_MAGIC_INIT     0x16bceaa5    /* Building a VDBE program */
   418  #define VDBE_MAGIC_RUN      0x2df20da3    /* VDBE is ready to execute */
   419  #define VDBE_MAGIC_HALT     0x319c2973    /* VDBE has completed execution */
   420  #define VDBE_MAGIC_RESET    0x48fa9f76    /* Reset and ready to run again */
   421  #define VDBE_MAGIC_DEAD     0x5606c3c8    /* The VDBE has been deallocated */
   422  
   423  /*
   424  ** Structure used to store the context required by the 
   425  ** sqlite3_preupdate_*() API functions.
   426  */
   427  struct PreUpdate {
   428    Vdbe *v;
   429    VdbeCursor *pCsr;               /* Cursor to read old values from */
   430    int op;                         /* One of SQLITE_INSERT, UPDATE, DELETE */
   431    u8 *aRecord;                    /* old.* database record */
   432    KeyInfo keyinfo;
   433    UnpackedRecord *pUnpacked;      /* Unpacked version of aRecord[] */
   434    UnpackedRecord *pNewUnpacked;   /* Unpacked version of new.* record */
   435    int iNewReg;                    /* Register for new.* values */
   436    i64 iKey1;                      /* First key value passed to hook */
   437    i64 iKey2;                      /* Second key value passed to hook */
   438    Mem *aNew;                      /* Array of new.* values */
   439    Table *pTab;                    /* Schema object being upated */          
   440    Index *pPk;                     /* PK index if pTab is WITHOUT ROWID */
   441  };
   442  
   443  /*
   444  ** Function prototypes
   445  */
   446  void sqlite3VdbeError(Vdbe*, const char *, ...);
   447  void sqlite3VdbeFreeCursor(Vdbe *, VdbeCursor*);
   448  void sqliteVdbePopStack(Vdbe*,int);
   449  int sqlite3VdbeCursorMoveto(VdbeCursor**, int*);
   450  int sqlite3VdbeCursorRestore(VdbeCursor*);
   451  #if defined(SQLITE_DEBUG) || defined(VDBE_PROFILE)
   452  void sqlite3VdbePrintOp(FILE*, int, Op*);
   453  #endif
   454  u32 sqlite3VdbeSerialTypeLen(u32);
   455  u8 sqlite3VdbeOneByteSerialTypeLen(u8);
   456  u32 sqlite3VdbeSerialType(Mem*, int, u32*);
   457  u32 sqlite3VdbeSerialPut(unsigned char*, Mem*, u32);
   458  u32 sqlite3VdbeSerialGet(const unsigned char*, u32, Mem*);
   459  void sqlite3VdbeDeleteAuxData(sqlite3*, AuxData**, int, int);
   460  
   461  int sqlite2BtreeKeyCompare(BtCursor *, const void *, int, int, int *);
   462  int sqlite3VdbeIdxKeyCompare(sqlite3*,VdbeCursor*,UnpackedRecord*,int*);
   463  int sqlite3VdbeIdxRowid(sqlite3*, BtCursor*, i64*);
   464  int sqlite3VdbeExec(Vdbe*);
   465  int sqlite3VdbeList(Vdbe*);
   466  int sqlite3VdbeHalt(Vdbe*);
   467  int sqlite3VdbeChangeEncoding(Mem *, int);
   468  int sqlite3VdbeMemTooBig(Mem*);
   469  int sqlite3VdbeMemCopy(Mem*, const Mem*);
   470  void sqlite3VdbeMemShallowCopy(Mem*, const Mem*, int);
   471  void sqlite3VdbeMemMove(Mem*, Mem*);
   472  int sqlite3VdbeMemNulTerminate(Mem*);
   473  int sqlite3VdbeMemSetStr(Mem*, const char*, int, u8, void(*)(void*));
   474  void sqlite3VdbeMemSetInt64(Mem*, i64);
   475  #ifdef SQLITE_OMIT_FLOATING_POINT
   476  # define sqlite3VdbeMemSetDouble sqlite3VdbeMemSetInt64
   477  #else
   478    void sqlite3VdbeMemSetDouble(Mem*, double);
   479  #endif
   480  void sqlite3VdbeMemSetPointer(Mem*, void*, const char*, void(*)(void*));
   481  void sqlite3VdbeMemInit(Mem*,sqlite3*,u16);
   482  void sqlite3VdbeMemSetNull(Mem*);
   483  void sqlite3VdbeMemSetZeroBlob(Mem*,int);
   484  void sqlite3VdbeMemSetRowSet(Mem*);
   485  int sqlite3VdbeMemMakeWriteable(Mem*);
   486  int sqlite3VdbeMemStringify(Mem*, u8, u8);
   487  i64 sqlite3VdbeIntValue(Mem*);
   488  int sqlite3VdbeMemIntegerify(Mem*);
   489  double sqlite3VdbeRealValue(Mem*);
   490  void sqlite3VdbeIntegerAffinity(Mem*);
   491  int sqlite3VdbeMemRealify(Mem*);
   492  int sqlite3VdbeMemNumerify(Mem*);
   493  void sqlite3VdbeMemCast(Mem*,u8,u8);
   494  int sqlite3VdbeMemFromBtree(BtCursor*,u32,u32,Mem*);
   495  void sqlite3VdbeMemRelease(Mem *p);
   496  int sqlite3VdbeMemFinalize(Mem*, FuncDef*);
   497  const char *sqlite3OpcodeName(int);
   498  int sqlite3VdbeMemGrow(Mem *pMem, int n, int preserve);
   499  int sqlite3VdbeMemClearAndResize(Mem *pMem, int n);
   500  int sqlite3VdbeCloseStatement(Vdbe *, int);
   501  void sqlite3VdbeFrameDelete(VdbeFrame*);
   502  int sqlite3VdbeFrameRestore(VdbeFrame *);
   503  #ifdef SQLITE_ENABLE_PREUPDATE_HOOK
   504  void sqlite3VdbePreUpdateHook(Vdbe*,VdbeCursor*,int,const char*,Table*,i64,int);
   505  #endif
   506  int sqlite3VdbeTransferError(Vdbe *p);
   507  
   508  int sqlite3VdbeSorterInit(sqlite3 *, int, VdbeCursor *);
   509  void sqlite3VdbeSorterReset(sqlite3 *, VdbeSorter *);
   510  void sqlite3VdbeSorterClose(sqlite3 *, VdbeCursor *);
   511  int sqlite3VdbeSorterRowkey(const VdbeCursor *, Mem *);
   512  int sqlite3VdbeSorterNext(sqlite3 *, const VdbeCursor *);
   513  int sqlite3VdbeSorterRewind(const VdbeCursor *, int *);
   514  int sqlite3VdbeSorterWrite(const VdbeCursor *, Mem *);
   515  int sqlite3VdbeSorterCompare(const VdbeCursor *, Mem *, int, int *);
   516  
   517  #if !defined(SQLITE_OMIT_SHARED_CACHE) 
   518    void sqlite3VdbeEnter(Vdbe*);
   519  #else
   520  # define sqlite3VdbeEnter(X)
   521  #endif
   522  
   523  #if !defined(SQLITE_OMIT_SHARED_CACHE) && SQLITE_THREADSAFE>0
   524    void sqlite3VdbeLeave(Vdbe*);
   525  #else
   526  # define sqlite3VdbeLeave(X)
   527  #endif
   528  
   529  #ifdef SQLITE_DEBUG
   530  void sqlite3VdbeMemAboutToChange(Vdbe*,Mem*);
   531  int sqlite3VdbeCheckMemInvariants(Mem*);
   532  #endif
   533  
   534  #ifndef SQLITE_OMIT_FOREIGN_KEY
   535  int sqlite3VdbeCheckFk(Vdbe *, int);
   536  #else
   537  # define sqlite3VdbeCheckFk(p,i) 0
   538  #endif
   539  
   540  #ifdef SQLITE_DEBUG
   541    void sqlite3VdbePrintSql(Vdbe*);
   542    void sqlite3VdbeMemPrettyPrint(Mem *pMem, char *zBuf);
   543  #endif
   544  #ifndef SQLITE_OMIT_UTF16
   545    int sqlite3VdbeMemTranslate(Mem*, u8);
   546    int sqlite3VdbeMemHandleBom(Mem *pMem);
   547  #endif
   548  
   549  #ifndef SQLITE_OMIT_INCRBLOB
   550    int sqlite3VdbeMemExpandBlob(Mem *);
   551    #define ExpandBlob(P) (((P)->flags&MEM_Zero)?sqlite3VdbeMemExpandBlob(P):0)
   552  #else
   553    #define sqlite3VdbeMemExpandBlob(x) SQLITE_OK
   554    #define ExpandBlob(P) SQLITE_OK
   555  #endif
   556  
   557  #endif /* !defined(SQLITE_VDBEINT_H) */