third_party/sqlite/sqlite-src-3080704/src/vdbeInt.h

   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 _VDBEINT_H_
  19 #define _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 ** SQL is translated into a sequence of instructions to be
  31 ** executed by a virtual machine.  Each instruction is an instance
  32 ** of the following structure.
  33 */
  34 typedef struct VdbeOp Op;
  35
  36 /*
  37 ** Boolean values
  38 */
  39 typedef unsigned Bool;
  40
  41 /* Opaque type used by code in vdbesort.c */
  42 typedef struct VdbeSorter VdbeSorter;
  43
  44 /* Opaque type used by the explainer */
  45 typedef struct Explain Explain;
  46
  47 /* Elements of the linked list at Vdbe.pAuxData */
  48 typedef struct AuxData AuxData;
  49
  50 /*
  51 ** A cursor is a pointer into a single BTree within a database file.
  52 ** The cursor can seek to a BTree entry with a particular key, or
  53 ** loop over all entries of the Btree.  You can also insert new BTree
  54 ** entries or retrieve the key or data from the entry that the cursor
  55 ** is currently pointing to.
  56 **
  57 ** Cursors can also point to virtual tables, sorters, or "pseudo-tables".
  58 ** A pseudo-table is a single-row table implemented by registers.
  59 **
  60 ** Every cursor that the virtual machine has open is represented by an
  61 ** instance of the following structure.
  62 */
  63 struct VdbeCursor {
  64   BtCursor *pCursor;    /* The cursor structure of the backend */
  65   Btree *pBt;           /* Separate file holding temporary table */
  66   KeyInfo *pKeyInfo;    /* Info about index keys needed by index cursors */
  67   int seekResult;       /* Result of previous sqlite3BtreeMoveto() */
  68   int pseudoTableReg;   /* Register holding pseudotable content. */
  69   i16 nField;           /* Number of fields in the header */
  70   u16 nHdrParsed;       /* Number of header fields parsed so far */
  71 #ifdef SQLITE_DEBUG
  72   u8 seekOp;            /* Most recent seek operation on this cursor */
  73 #endif
  74   i8 iDb;               /* Index of cursor database in db->aDb[] (or -1) */
  75   u8 nullRow;           /* True if pointing to a row with no data */
  76   u8 deferredMoveto;    /* A call to sqlite3BtreeMoveto() is needed */
  77   Bool isEphemeral:1;   /* True for an ephemeral table */
  78   Bool useRandomRowid:1;/* Generate new record numbers semi-randomly */
  79   Bool isTable:1;       /* True if a table requiring integer keys */
  80   Bool isOrdered:1;     /* True if the underlying table is BTREE_UNORDERED */
  81   Pgno pgnoRoot;        /* Root page of the open btree cursor */
  82   sqlite3_vtab_cursor *pVtabCursor;  /* The cursor for a virtual table */
  83   i64 seqCount;         /* Sequence counter */
  84   i64 movetoTarget;     /* Argument to the deferred sqlite3BtreeMoveto() */
  85   VdbeSorter *pSorter;  /* Sorter object for OP_SorterOpen cursors */
  86
  87   /* Cached information about the header for the data record that the
  88   ** cursor is currently pointing to.  Only valid if cacheStatus matches
  89   ** Vdbe.cacheCtr.  Vdbe.cacheCtr will never take on the value of
  90   ** CACHE_STALE and so setting cacheStatus=CACHE_STALE guarantees that
  91   ** the cache is out of date.
  92   **
  93   ** aRow might point to (ephemeral) data for the current row, or it might
  94   ** be NULL.
  95   */
  96   u32 cacheStatus;      /* Cache is valid if this matches Vdbe.cacheCtr */
  97   u32 payloadSize;      /* Total number of bytes in the record */
  98   u32 szRow;            /* Byte available in aRow */
  99   u32 iHdrOffset;       /* Offset to next unparsed byte of the header */
 100   const u8 *aRow;       /* Data for the current row, if all on one page */
 101   u32 *aOffset;         /* Pointer to aType[nField] */
 102   u32 aType[1];         /* Type values for all entries in the record */
 103   /* 2*nField extra array elements allocated for aType[], beyond the one
 104   ** static element declared in the structure.  nField total array slots for
 105   ** aType[] and nField+1 array slots for aOffset[] */
 106 };
 107 typedef struct VdbeCursor VdbeCursor;
 108
 109 /*
 110 ** When a sub-program is executed (OP_Program), a structure of this type
 111 ** is allocated to store the current value of the program counter, as
 112 ** well as the current memory cell array and various other frame specific
 113 ** values stored in the Vdbe struct. When the sub-program is finished,
 114 ** these values are copied back to the Vdbe from the VdbeFrame structure,
 115 ** restoring the state of the VM to as it was before the sub-program
 116 ** began executing.
 117 **
 118 ** The memory for a VdbeFrame object is allocated and managed by a memory
 119 ** cell in the parent (calling) frame. When the memory cell is deleted or
 120 ** overwritten, the VdbeFrame object is not freed immediately. Instead, it
 121 ** is linked into the Vdbe.pDelFrame list. The contents of the Vdbe.pDelFrame
 122 ** list is deleted when the VM is reset in VdbeHalt(). The reason for doing
 123 ** this instead of deleting the VdbeFrame immediately is to avoid recursive
 124 ** calls to sqlite3VdbeMemRelease() when the memory cells belonging to the
 125 ** child frame are released.
 126 **
 127 ** The currently executing frame is stored in Vdbe.pFrame. Vdbe.pFrame is
 128 ** set to NULL if the currently executing frame is the main program.
 129 */
 130 typedef struct VdbeFrame VdbeFrame;
 131 struct VdbeFrame {
 132   Vdbe *v;                /* VM this frame belongs to */
 133   VdbeFrame *pParent;     /* Parent of this frame, or NULL if parent is main */
 134   Op *aOp;                /* Program instructions for parent frame */
 135   Mem *aMem;              /* Array of memory cells for parent frame */
 136   u8 *aOnceFlag;          /* Array of OP_Once flags for parent frame */
 137   VdbeCursor **apCsr;     /* Array of Vdbe cursors for parent frame */
 138   void *token;            /* Copy of SubProgram.token */
 139   i64 lastRowid;          /* Last insert rowid (sqlite3.lastRowid) */
 140   int nCursor;            /* Number of entries in apCsr */
 141   int pc;                 /* Program Counter in parent (calling) frame */
 142   int nOp;                /* Size of aOp array */
 143   int nMem;               /* Number of entries in aMem */
 144   int nOnceFlag;          /* Number of entries in aOnceFlag */
 145   int nChildMem;          /* Number of memory cells for child frame */
 146   int nChildCsr;          /* Number of cursors for child frame */
 147   int nChange;            /* Statement changes (Vdbe.nChanges)     */
 148 };
 149
 150 #define VdbeFrameMem(p) ((Mem *)&((u8 *)p)[ROUND8(sizeof(VdbeFrame))])
 151
 152 /*
 153 ** A value for VdbeCursor.cacheValid that means the cache is always invalid.
 154 */
 155 #define CACHE_STALE 0
 156
 157 /*
 158 ** Internally, the vdbe manipulates nearly all SQL values as Mem
 159 ** structures. Each Mem struct may cache multiple representations (string,
 160 ** integer etc.) of the same value.
 161 */
 162 struct Mem {
 163   union MemValue {
 164     double r;           /* Real value used when MEM_Real is set in flags */
 165     i64 i;              /* Integer value used when MEM_Int is set in flags */
 166     int nZero;          /* Used when bit MEM_Zero is set in flags */
 167     FuncDef *pDef;      /* Used only when flags==MEM_Agg */
 168     RowSet *pRowSet;    /* Used only when flags==MEM_RowSet */
 169     VdbeFrame *pFrame;  /* Used when flags==MEM_Frame */
 170   } u;
 171   u16 flags;          /* Some combination of MEM_Null, MEM_Str, MEM_Dyn, etc. */
 172   u8  enc;            /* SQLITE_UTF8, SQLITE_UTF16BE, SQLITE_UTF16LE */
 173   int n;              /* Number of characters in string value, excluding '\0' */
 174   char *z;            /* String or BLOB value */
 175   /* ShallowCopy only needs to copy the information above */
 176   char *zMalloc;      /* Space to hold MEM_Str or MEM_Blob if szMalloc>0 */
 177   int szMalloc;       /* Size of the zMalloc allocation */
 178   u32 uTemp;          /* Transient storage for serial_type in OP_MakeRecord */
 179   sqlite3 *db;        /* The associated database connection */
 180   void (*xDel)(void*);/* Destructor for Mem.z - only valid if MEM_Dyn */
 181 #ifdef SQLITE_DEBUG
 182   Mem *pScopyFrom;    /* This Mem is a shallow copy of pScopyFrom */
 183   void *pFiller;      /* So that sizeof(Mem) is a multiple of 8 */
 184 #endif
 185 };
 186
 187 /* One or more of the following flags are set to indicate the validOK
 188 ** representations of the value stored in the Mem struct.
 189 **
 190 ** If the MEM_Null flag is set, then the value is an SQL NULL value.
 191 ** No other flags may be set in this case.
 192 **
 193 ** If the MEM_Str flag is set then Mem.z points at a string representation.
 194 ** Usually this is encoded in the same unicode encoding as the main
 195 ** database (see below for exceptions). If the MEM_Term flag is also
 196 ** set, then the string is nul terminated. The MEM_Int and MEM_Real
 197 ** flags may coexist with the MEM_Str flag.
 198 */
 199 #define MEM_Null      0x0001   /* Value is NULL */
 200 #define MEM_Str       0x0002   /* Value is a string */
 201 #define MEM_Int       0x0004   /* Value is an integer */
 202 #define MEM_Real      0x0008   /* Value is a real number */
 203 #define MEM_Blob      0x0010   /* Value is a BLOB */
 204 #define MEM_AffMask   0x001f   /* Mask of affinity bits */
 205 #define MEM_RowSet    0x0020   /* Value is a RowSet object */
 206 #define MEM_Frame     0x0040   /* Value is a VdbeFrame object */
 207 #define MEM_Undefined 0x0080   /* Value is undefined */
 208 #define MEM_Cleared   0x0100   /* NULL set by OP_Null, not from data */
 209 #define MEM_TypeMask  0x01ff   /* Mask of type bits */
 210
 211
 212 /* Whenever Mem contains a valid string or blob representation, one of
 213 ** the following flags must be set to determine the memory management
 214 ** policy for Mem.z.  The MEM_Term flag tells us whether or not the
 215 ** string is \000 or \u0000 terminated
 216 */
 217 #define MEM_Term      0x0200   /* String rep is nul terminated */
 218 #define MEM_Dyn       0x0400   /* Need to call Mem.xDel() on Mem.z */
 219 #define MEM_Static    0x0800   /* Mem.z points to a static string */
 220 #define MEM_Ephem     0x1000   /* Mem.z points to an ephemeral string */
 221 #define MEM_Agg       0x2000   /* Mem.z points to an agg function context */
 222 #define MEM_Zero      0x4000   /* Mem.i contains count of 0s appended to blob */
 223 #ifdef SQLITE_OMIT_INCRBLOB
 224   #undef MEM_Zero
 225   #define MEM_Zero 0x0000
 226 #endif
 227
 228 /*
 229 ** Clear any existing type flags from a Mem and replace them with f
 230 */
 231 #define MemSetTypeFlag(p, f) \
 232    ((p)->flags = ((p)->flags&~(MEM_TypeMask|MEM_Zero))|f)
 233
 234 /*
 235 ** Return true if a memory cell is not marked as invalid.  This macro
 236 ** is for use inside assert() statements only.
 237 */
 238 #ifdef SQLITE_DEBUG
 239 #define memIsValid(M)  ((M)->flags & MEM_Undefined)==0
 240 #endif
 241
 242 /*
 243 ** Each auxiliary data pointer stored by a user defined function
 244 ** implementation calling sqlite3_set_auxdata() is stored in an instance
 245 ** of this structure. All such structures associated with a single VM
 246 ** are stored in a linked list headed at Vdbe.pAuxData. All are destroyed
 247 ** when the VM is halted (if not before).
 248 */
 249 struct AuxData {
 250   int iOp;                        /* Instruction number of OP_Function opcode */
 251   int iArg;                       /* Index of function argument. */
 252   void *pAux;                     /* Aux data pointer */
 253   void (*xDelete)(void *);        /* Destructor for the aux data */
 254   AuxData *pNext;                 /* Next element in list */
 255 };
 256
 257 /*
 258 ** The "context" argument for an installable function.  A pointer to an
 259 ** instance of this structure is the first argument to the routines used
 260 ** implement the SQL functions.
 261 **
 262 ** There is a typedef for this structure in sqlite.h.  So all routines,
 263 ** even the public interface to SQLite, can use a pointer to this structure.
 264 ** But this file is the only place where the internal details of this
 265 ** structure are known.
 266 **
 267 ** This structure is defined inside of vdbeInt.h because it uses substructures
 268 ** (Mem) which are only defined there.
 269 */
 270 struct sqlite3_context {
 271   Mem *pOut;            /* The return value is stored here */
 272   FuncDef *pFunc;       /* Pointer to function information */
 273   Mem *pMem;            /* Memory cell used to store aggregate context */
 274   Vdbe *pVdbe;          /* The VM that owns this context */
 275   int iOp;              /* Instruction number of OP_Function */
 276   int isError;          /* Error code returned by the function. */
 277   u8 skipFlag;          /* Skip accumulator loading if true */
 278   u8 fErrorOrAux;       /* isError!=0 or pVdbe->pAuxData modified */
 279 };
 280
 281 /*
 282 ** An Explain object accumulates indented output which is helpful
 283 ** in describing recursive data structures.
 284 */
 285 struct Explain {
 286   Vdbe *pVdbe;       /* Attach the explanation to this Vdbe */
 287   StrAccum str;      /* The string being accumulated */
 288   int nIndent;       /* Number of elements in aIndent */
 289   u16 aIndent[100];  /* Levels of indentation */
 290   char zBase[100];   /* Initial space */
 291 };
 292
 293 /* A bitfield type for use inside of structures.  Always follow with :N where
 294 ** N is the number of bits.
 295 */
 296 typedef unsigned bft;  /* Bit Field Type */
 297
 298 /*
 299 ** An instance of the virtual machine.  This structure contains the complete
 300 ** state of the virtual machine.
 301 **
 302 ** The "sqlite3_stmt" structure pointer that is returned by sqlite3_prepare()
 303 ** is really a pointer to an instance of this structure.
 304 **
 305 ** The Vdbe.inVtabMethod variable is set to non-zero for the duration of
 306 ** any virtual table method invocations made by the vdbe program. It is
 307 ** set to 2 for xDestroy method calls and 1 for all other methods. This
 308 ** variable is used for two purposes: to allow xDestroy methods to execute
 309 ** "DROP TABLE" statements and to prevent some nasty side effects of
 310 ** malloc failure when SQLite is invoked recursively by a virtual table
 311 ** method function.
 312 */
 313 struct Vdbe {
 314   sqlite3 *db;            /* The database connection that owns this statement */
 315   Op *aOp;                /* Space to hold the virtual machine's program */
 316   Mem *aMem;              /* The memory locations */
 317   Mem **apArg;            /* Arguments to currently executing user function */
 318   Mem *aColName;          /* Column names to return */
 319   Mem *pResultSet;        /* Pointer to an array of results */
 320   Parse *pParse;          /* Parsing context used to create this Vdbe */
 321   int nMem;               /* Number of memory locations currently allocated */
 322   int nOp;                /* Number of instructions in the program */
 323   int nCursor;            /* Number of slots in apCsr[] */
 324   u32 magic;              /* Magic number for sanity checking */
 325   char *zErrMsg;          /* Error message written here */
 326   Vdbe *pPrev,*pNext;     /* Linked list of VDBEs with the same Vdbe.db */
 327   VdbeCursor **apCsr;     /* One element of this array for each open cursor */
 328   Mem *aVar;              /* Values for the OP_Variable opcode. */
 329   char **azVar;           /* Name of variables */
 330   ynVar nVar;             /* Number of entries in aVar[] */
 331   ynVar nzVar;            /* Number of entries in azVar[] */
 332   u32 cacheCtr;           /* VdbeCursor row cache generation counter */
 333   int pc;                 /* The program counter */
 334   int rc;                 /* Value to return */
 335   u16 nResColumn;         /* Number of columns in one row of the result set */
 336   u8 errorAction;         /* Recovery action to do in case of an error */
 337   u8 minWriteFileFormat;  /* Minimum file format for writable database files */
 338   bft explain:2;          /* True if EXPLAIN present on SQL command */
 339   bft inVtabMethod:2;     /* See comments above */
 340   bft changeCntOn:1;      /* True to update the change-counter */
 341   bft expired:1;          /* True if the VM needs to be recompiled */
 342   bft runOnlyOnce:1;      /* Automatically expire on reset */
 343   bft usesStmtJournal:1;  /* True if uses a statement journal */
 344   bft readOnly:1;         /* True for statements that do not write */
 345   bft bIsReader:1;        /* True for statements that read */
 346   bft isPrepareV2:1;      /* True if prepared with prepare_v2() */
 347   bft doingRerun:1;       /* True if rerunning after an auto-reprepare */
 348   int nChange;            /* Number of db changes made since last reset */
 349   yDbMask btreeMask;      /* Bitmask of db->aDb[] entries referenced */
 350   yDbMask lockMask;       /* Subset of btreeMask that requires a lock */
 351   int iStatement;         /* Statement number (or 0 if has not opened stmt) */
 352   u32 aCounter[5];        /* Counters used by sqlite3_stmt_status() */
 353 #ifndef SQLITE_OMIT_TRACE
 354   i64 startTime;          /* Time when query started - used for profiling */
 355 #endif
 356   i64 iCurrentTime;       /* Value of julianday('now') for this statement */
 357   i64 nFkConstraint;      /* Number of imm. FK constraints this VM */
 358   i64 nStmtDefCons;       /* Number of def. constraints when stmt started */
 359   i64 nStmtDefImmCons;    /* Number of def. imm constraints when stmt started */
 360   char *zSql;             /* Text of the SQL statement that generated this */
 361   void *pFree;            /* Free this when deleting the vdbe */
 362   VdbeFrame *pFrame;      /* Parent frame */
 363   VdbeFrame *pDelFrame;   /* List of frame objects to free on VM reset */
 364   int nFrame;             /* Number of frames in pFrame list */
 365   u32 expmask;            /* Binding to these vars invalidates VM */
 366   SubProgram *pProgram;   /* Linked list of all sub-programs used by VM */
 367   int nOnceFlag;          /* Size of array aOnceFlag[] */
 368   u8 *aOnceFlag;          /* Flags for OP_Once */
 369   AuxData *pAuxData;      /* Linked list of auxdata allocations */
 370 };
 371
 372 /*
 373 ** The following are allowed values for Vdbe.magic
 374 */
 375 #define VDBE_MAGIC_INIT     0x26bceaa5    /* Building a VDBE program */
 376 #define VDBE_MAGIC_RUN      0xbdf20da3    /* VDBE is ready to execute */
 377 #define VDBE_MAGIC_HALT     0x519c2973    /* VDBE has completed execution */
 378 #define VDBE_MAGIC_DEAD     0xb606c3c8    /* The VDBE has been deallocated */
 379
 380 /*
 381 ** Function prototypes
 382 */
 383 void sqlite3VdbeFreeCursor(Vdbe *, VdbeCursor*);
 384 void sqliteVdbePopStack(Vdbe*,int);
 385 int sqlite3VdbeCursorMoveto(VdbeCursor*);
 386 int sqlite3VdbeCursorRestore(VdbeCursor*);
 387 #if defined(SQLITE_DEBUG) || defined(VDBE_PROFILE)
 388 void sqlite3VdbePrintOp(FILE*, int, Op*);
 389 #endif
 390 u32 sqlite3VdbeSerialTypeLen(u32);
 391 u32 sqlite3VdbeSerialType(Mem*, int);
 392 u32 sqlite3VdbeSerialPut(unsigned char*, Mem*, u32);
 393 u32 sqlite3VdbeSerialGet(const unsigned char*, u32, Mem*);
 394 void sqlite3VdbeDeleteAuxData(Vdbe*, int, int);
 395
 396 int sqlite2BtreeKeyCompare(BtCursor *, const void *, int, int, int *);
 397 int sqlite3VdbeIdxKeyCompare(sqlite3*,VdbeCursor*,UnpackedRecord*,int*);
 398 int sqlite3VdbeIdxRowid(sqlite3*, BtCursor*, i64*);
 399 int sqlite3VdbeExec(Vdbe*);
 400 int sqlite3VdbeList(Vdbe*);
 401 int sqlite3VdbeHalt(Vdbe*);
 402 int sqlite3VdbeChangeEncoding(Mem *, int);
 403 int sqlite3VdbeMemTooBig(Mem*);
 404 int sqlite3VdbeMemCopy(Mem*, const Mem*);
 405 void sqlite3VdbeMemShallowCopy(Mem*, const Mem*, int);
 406 void sqlite3VdbeMemMove(Mem*, Mem*);
 407 int sqlite3VdbeMemNulTerminate(Mem*);
 408 int sqlite3VdbeMemSetStr(Mem*, const char*, int, u8, void(*)(void*));
 409 void sqlite3VdbeMemSetInt64(Mem*, i64);
 410 #ifdef SQLITE_OMIT_FLOATING_POINT
 411 # define sqlite3VdbeMemSetDouble sqlite3VdbeMemSetInt64
 412 #else
 413   void sqlite3VdbeMemSetDouble(Mem*, double);
 414 #endif
 415 void sqlite3VdbeMemInit(Mem*,sqlite3*,u16);
 416 void sqlite3VdbeMemSetNull(Mem*);
 417 void sqlite3VdbeMemSetZeroBlob(Mem*,int);
 418 void sqlite3VdbeMemSetRowSet(Mem*);
 419 int sqlite3VdbeMemMakeWriteable(Mem*);
 420 int sqlite3VdbeMemStringify(Mem*, u8, u8);
 421 i64 sqlite3VdbeIntValue(Mem*);
 422 int sqlite3VdbeMemIntegerify(Mem*);
 423 double sqlite3VdbeRealValue(Mem*);
 424 void sqlite3VdbeIntegerAffinity(Mem*);
 425 int sqlite3VdbeMemRealify(Mem*);
 426 int sqlite3VdbeMemNumerify(Mem*);
 427 void sqlite3VdbeMemCast(Mem*,u8,u8);
 428 int sqlite3VdbeMemFromBtree(BtCursor*,u32,u32,int,Mem*);
 429 void sqlite3VdbeMemRelease(Mem *p);
 430 #define VdbeMemDynamic(X)  \
 431   (((X)->flags&(MEM_Agg|MEM_Dyn|MEM_RowSet|MEM_Frame))!=0)
 432 int sqlite3VdbeMemFinalize(Mem*, FuncDef*);
 433 const char *sqlite3OpcodeName(int);
 434 int sqlite3VdbeMemGrow(Mem *pMem, int n, int preserve);
 435 int sqlite3VdbeMemClearAndResize(Mem *pMem, int n);
 436 int sqlite3VdbeCloseStatement(Vdbe *, int);
 437 void sqlite3VdbeFrameDelete(VdbeFrame*);
 438 int sqlite3VdbeFrameRestore(VdbeFrame *);
 439 int sqlite3VdbeTransferError(Vdbe *p);
 440
 441 int sqlite3VdbeSorterInit(sqlite3 *, int, VdbeCursor *);
 442 void sqlite3VdbeSorterReset(sqlite3 *, VdbeSorter *);
 443 void sqlite3VdbeSorterClose(sqlite3 *, VdbeCursor *);
 444 int sqlite3VdbeSorterRowkey(const VdbeCursor *, Mem *);
 445 int sqlite3VdbeSorterNext(sqlite3 *, const VdbeCursor *, int *);
 446 int sqlite3VdbeSorterRewind(const VdbeCursor *, int *);
 447 int sqlite3VdbeSorterWrite(const VdbeCursor *, Mem *);
 448 int sqlite3VdbeSorterCompare(const VdbeCursor *, Mem *, int, int *);
 449
 450 #if !defined(SQLITE_OMIT_SHARED_CACHE) && SQLITE_THREADSAFE>0
 451   void sqlite3VdbeEnter(Vdbe*);
 452   void sqlite3VdbeLeave(Vdbe*);
 453 #else
 454 # define sqlite3VdbeEnter(X)
 455 # define sqlite3VdbeLeave(X)
 456 #endif
 457
 458 #ifdef SQLITE_DEBUG
 459 void sqlite3VdbeMemAboutToChange(Vdbe*,Mem*);
 460 int sqlite3VdbeCheckMemInvariants(Mem*);
 461 #endif
 462
 463 #ifndef SQLITE_OMIT_FOREIGN_KEY
 464 int sqlite3VdbeCheckFk(Vdbe *, int);
 465 #else
 466 # define sqlite3VdbeCheckFk(p,i) 0
 467 #endif
 468
 469 int sqlite3VdbeMemTranslate(Mem*, u8);
 470 #ifdef SQLITE_DEBUG
 471   void sqlite3VdbePrintSql(Vdbe*);
 472   void sqlite3VdbeMemPrettyPrint(Mem *pMem, char *zBuf);
 473 #endif
 474 int sqlite3VdbeMemHandleBom(Mem *pMem);
 475
 476 #ifndef SQLITE_OMIT_INCRBLOB
 477   int sqlite3VdbeMemExpandBlob(Mem *);
 478   #define ExpandBlob(P) (((P)->flags&MEM_Zero)?sqlite3VdbeMemExpandBlob(P):0)
 479 #else
 480   #define sqlite3VdbeMemExpandBlob(x) SQLITE_OK
 481   #define ExpandBlob(P) SQLITE_OK
 482 #endif
 483
 484 #endif /* !defined(_VDBEINT_H_) */