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 ** SQL is translated into a sequence of instructions to be
  23 ** executed by a virtual machine.  Each instruction is an instance
  24 ** of the following structure.
  25 */
  26 typedef struct VdbeOp Op;
  27
  28 /*
  29 ** Boolean values
  30 */
  31 typedef unsigned char Bool;
  32
  33 /* Opaque type used by code in vdbesort.c */
  34 typedef struct VdbeSorter VdbeSorter;
  35
  36 /* Opaque type used by the explainer */
  37 typedef struct Explain Explain;
  38
  39 /*
  40 ** A cursor is a pointer into a single BTree within a database file.
  41 ** The cursor can seek to a BTree entry with a particular key, or
  42 ** loop over all entries of the Btree.  You can also insert new BTree
  43 ** entries or retrieve the key or data from the entry that the cursor
  44 ** is currently pointing to.
  45 **
  46 ** Every cursor that the virtual machine has open is represented by an
  47 ** instance of the following structure.
  48 */
  49 struct VdbeCursor {
  50   BtCursor *pCursor;    /* The cursor structure of the backend */
  51   Btree *pBt;           /* Separate file holding temporary table */
  52   KeyInfo *pKeyInfo;    /* Info about index keys needed by index cursors */
  53   int iDb;              /* Index of cursor database in db->aDb[] (or -1) */
  54   int pseudoTableReg;   /* Register holding pseudotable content. */
  55   int nField;           /* Number of fields in the header */
  56   Bool zeroed;          /* True if zeroed out and ready for reuse */
  57   Bool rowidIsValid;    /* True if lastRowid is valid */
  58   Bool atFirst;         /* True if pointing to first entry */
  59   Bool useRandomRowid;  /* Generate new record numbers semi-randomly */
  60   Bool nullRow;         /* True if pointing to a row with no data */
  61   Bool deferredMoveto;  /* A call to sqlite3BtreeMoveto() is needed */
  62   Bool isTable;         /* True if a table requiring integer keys */
  63   Bool isIndex;         /* True if an index containing keys only - no data */
  64   Bool isOrdered;       /* True if the underlying table is BTREE_UNORDERED */
  65   Bool isSorter;        /* True if a new-style sorter */
  66   sqlite3_vtab_cursor *pVtabCursor;  /* The cursor for a virtual table */
  67   const sqlite3_module *pModule;     /* Module for cursor pVtabCursor */
  68   i64 seqCount;         /* Sequence counter */
  69   i64 movetoTarget;     /* Argument to the deferred sqlite3BtreeMoveto() */
  70   i64 lastRowid;        /* Last rowid from a Next or NextIdx operation */
  71   VdbeSorter *pSorter;  /* Sorter object for OP_SorterOpen cursors */
  72
  73   /* Result of last sqlite3BtreeMoveto() done by an OP_NotExists or
  74   ** OP_IsUnique opcode on this cursor. */
  75   int seekResult;
  76
  77   /* Cached information about the header for the data record that the
  78   ** cursor is currently pointing to.  Only valid if cacheStatus matches
  79   ** Vdbe.cacheCtr.  Vdbe.cacheCtr will never take on the value of
  80   ** CACHE_STALE and so setting cacheStatus=CACHE_STALE guarantees that
  81   ** the cache is out of date.
  82   **
  83   ** aRow might point to (ephemeral) data for the current row, or it might
  84   ** be NULL.
  85   */
  86   u32 cacheStatus;      /* Cache is valid if this matches Vdbe.cacheCtr */
  87   int payloadSize;      /* Total number of bytes in the record */
  88   u32 *aType;           /* Type values for all entries in the record */
  89   u32 *aOffset;         /* Cached offsets to the start of each columns data */
  90   u8 *aRow;             /* Data for the current row, if all on one page */
  91 };
  92 typedef struct VdbeCursor VdbeCursor;
  93
  94 /*
  95 ** When a sub-program is executed (OP_Program), a structure of this type
  96 ** is allocated to store the current value of the program counter, as
  97 ** well as the current memory cell array and various other frame specific
  98 ** values stored in the Vdbe struct. When the sub-program is finished,
  99 ** these values are copied back to the Vdbe from the VdbeFrame structure,
 100 ** restoring the state of the VM to as it was before the sub-program
 101 ** began executing.
 102 **
 103 ** The memory for a VdbeFrame object is allocated and managed by a memory
 104 ** cell in the parent (calling) frame. When the memory cell is deleted or
 105 ** overwritten, the VdbeFrame object is not freed immediately. Instead, it
 106 ** is linked into the Vdbe.pDelFrame list. The contents of the Vdbe.pDelFrame
 107 ** list is deleted when the VM is reset in VdbeHalt(). The reason for doing
 108 ** this instead of deleting the VdbeFrame immediately is to avoid recursive
 109 ** calls to sqlite3VdbeMemRelease() when the memory cells belonging to the
 110 ** child frame are released.
 111 **
 112 ** The currently executing frame is stored in Vdbe.pFrame. Vdbe.pFrame is
 113 ** set to NULL if the currently executing frame is the main program.
 114 */
 115 typedef struct VdbeFrame VdbeFrame;
 116 struct VdbeFrame {
 117   Vdbe *v;                /* VM this frame belongs to */
 118   VdbeFrame *pParent;     /* Parent of this frame, or NULL if parent is main */
 119   Op *aOp;                /* Program instructions for parent frame */
 120   Mem *aMem;              /* Array of memory cells for parent frame */
 121   u8 *aOnceFlag;          /* Array of OP_Once flags for parent frame */
 122   VdbeCursor **apCsr;     /* Array of Vdbe cursors for parent frame */
 123   void *token;            /* Copy of SubProgram.token */
 124   i64 lastRowid;          /* Last insert rowid (sqlite3.lastRowid) */
 125   u16 nCursor;            /* Number of entries in apCsr */
 126   int pc;                 /* Program Counter in parent (calling) frame */
 127   int nOp;                /* Size of aOp array */
 128   int nMem;               /* Number of entries in aMem */
 129   int nOnceFlag;          /* Number of entries in aOnceFlag */
 130   int nChildMem;          /* Number of memory cells for child frame */
 131   int nChildCsr;          /* Number of cursors for child frame */
 132   int nChange;            /* Statement changes (Vdbe.nChanges)     */
 133 };
 134
 135 #define VdbeFrameMem(p) ((Mem *)&((u8 *)p)[ROUND8(sizeof(VdbeFrame))])
 136
 137 /*
 138 ** A value for VdbeCursor.cacheValid that means the cache is always invalid.
 139 */
 140 #define CACHE_STALE 0
 141
 142 /*
 143 ** Internally, the vdbe manipulates nearly all SQL values as Mem
 144 ** structures. Each Mem struct may cache multiple representations (string,
 145 ** integer etc.) of the same value.
 146 */
 147 struct Mem {
 148   sqlite3 *db;        /* The associated database connection */
 149   char *z;            /* String or BLOB value */
 150   double r;           /* Real value */
 151   union {
 152     i64 i;              /* Integer value used when MEM_Int is set in flags */
 153     int nZero;          /* Used when bit MEM_Zero is set in flags */
 154     FuncDef *pDef;      /* Used only when flags==MEM_Agg */
 155     RowSet *pRowSet;    /* Used only when flags==MEM_RowSet */
 156     VdbeFrame *pFrame;  /* Used when flags==MEM_Frame */
 157   } u;
 158   int n;              /* Number of characters in string value, excluding '\0' */
 159   u16 flags;          /* Some combination of MEM_Null, MEM_Str, MEM_Dyn, etc. */
 160   u8  type;           /* One of SQLITE_NULL, SQLITE_TEXT, SQLITE_INTEGER, etc */
 161   u8  enc;            /* SQLITE_UTF8, SQLITE_UTF16BE, SQLITE_UTF16LE */
 162 #ifdef SQLITE_DEBUG
 163   Mem *pScopyFrom;    /* This Mem is a shallow copy of pScopyFrom */
 164   void *pFiller;      /* So that sizeof(Mem) is a multiple of 8 */
 165 #endif
 166   void (*xDel)(void *);  /* If not null, call this function to delete Mem.z */
 167   char *zMalloc;      /* Dynamic buffer allocated by sqlite3_malloc() */
 168 };
 169
 170 /* One or more of the following flags are set to indicate the validOK
 171 ** representations of the value stored in the Mem struct.
 172 **
 173 ** If the MEM_Null flag is set, then the value is an SQL NULL value.
 174 ** No other flags may be set in this case.
 175 **
 176 ** If the MEM_Str flag is set then Mem.z points at a string representation.
 177 ** Usually this is encoded in the same unicode encoding as the main
 178 ** database (see below for exceptions). If the MEM_Term flag is also
 179 ** set, then the string is nul terminated. The MEM_Int and MEM_Real
 180 ** flags may coexist with the MEM_Str flag.
 181 */
 182 #define MEM_Null      0x0001   /* Value is NULL */
 183 #define MEM_Str       0x0002   /* Value is a string */
 184 #define MEM_Int       0x0004   /* Value is an integer */
 185 #define MEM_Real      0x0008   /* Value is a real number */
 186 #define MEM_Blob      0x0010   /* Value is a BLOB */
 187 #define MEM_RowSet    0x0020   /* Value is a RowSet object */
 188 #define MEM_Frame     0x0040   /* Value is a VdbeFrame object */
 189 #define MEM_Invalid   0x0080   /* Value is undefined */
 190 #define MEM_TypeMask  0x00ff   /* Mask of type bits */
 191
 192 /* Whenever Mem contains a valid string or blob representation, one of
 193 ** the following flags must be set to determine the memory management
 194 ** policy for Mem.z.  The MEM_Term flag tells us whether or not the
 195 ** string is \000 or \u0000 terminated
 196 */
 197 #define MEM_Term      0x0200   /* String rep is nul terminated */
 198 #define MEM_Dyn       0x0400   /* Need to call sqliteFree() on Mem.z */
 199 #define MEM_Static    0x0800   /* Mem.z points to a static string */
 200 #define MEM_Ephem     0x1000   /* Mem.z points to an ephemeral string */
 201 #define MEM_Agg       0x2000   /* Mem.z points to an agg function context */
 202 #define MEM_Zero      0x4000   /* Mem.i contains count of 0s appended to blob */
 203 #ifdef SQLITE_OMIT_INCRBLOB
 204   #undef MEM_Zero
 205   #define MEM_Zero 0x0000
 206 #endif
 207
 208 /*
 209 ** Clear any existing type flags from a Mem and replace them with f
 210 */
 211 #define MemSetTypeFlag(p, f) \
 212    ((p)->flags = ((p)->flags&~(MEM_TypeMask|MEM_Zero))|f)
 213
 214 /*
 215 ** Return true if a memory cell is not marked as invalid.  This macro
 216 ** is for use inside assert() statements only.
 217 */
 218 #ifdef SQLITE_DEBUG
 219 #define memIsValid(M)  ((M)->flags & MEM_Invalid)==0
 220 #endif
 221
 222
 223 /* A VdbeFunc is just a FuncDef (defined in sqliteInt.h) that contains
 224 ** additional information about auxiliary information bound to arguments
 225 ** of the function.  This is used to implement the sqlite3_get_auxdata()
 226 ** and sqlite3_set_auxdata() APIs.  The "auxdata" is some auxiliary data
 227 ** that can be associated with a constant argument to a function.  This
 228 ** allows functions such as "regexp" to compile their constant regular
 229 ** expression argument once and reused the compiled code for multiple
 230 ** invocations.
 231 */
 232 struct VdbeFunc {
 233   FuncDef *pFunc;               /* The definition of the function */
 234   int nAux;                     /* Number of entries allocated for apAux[] */
 235   struct AuxData {
 236     void *pAux;                   /* Aux data for the i-th argument */
 237     void (*xDelete)(void *);      /* Destructor for the aux data */
 238   } apAux[1];                   /* One slot for each function argument */
 239 };
 240
 241 /*
 242 ** The "context" argument for a installable function.  A pointer to an
 243 ** instance of this structure is the first argument to the routines used
 244 ** implement the SQL functions.
 245 **
 246 ** There is a typedef for this structure in sqlite.h.  So all routines,
 247 ** even the public interface to SQLite, can use a pointer to this structure.
 248 ** But this file is the only place where the internal details of this
 249 ** structure are known.
 250 **
 251 ** This structure is defined inside of vdbeInt.h because it uses substructures
 252 ** (Mem) which are only defined there.
 253 */
 254 struct sqlite3_context {
 255   FuncDef *pFunc;       /* Pointer to function information.  MUST BE FIRST */
 256   VdbeFunc *pVdbeFunc;  /* Auxilary data, if created. */
 257   Mem s;                /* The return value is stored here */
 258   Mem *pMem;            /* Memory cell used to store aggregate context */
 259   CollSeq *pColl;       /* Collating sequence */
 260   int isError;          /* Error code returned by the function. */
 261   int skipFlag;         /* Skip skip accumulator loading if true */
 262 };
 263
 264 /*
 265 ** An Explain object accumulates indented output which is helpful
 266 ** in describing recursive data structures.
 267 */
 268 struct Explain {
 269   Vdbe *pVdbe;       /* Attach the explanation to this Vdbe */
 270   StrAccum str;      /* The string being accumulated */
 271   int nIndent;       /* Number of elements in aIndent */
 272   u16 aIndent[100];  /* Levels of indentation */
 273   char zBase[100];   /* Initial space */
 274 };
 275
 276 /*
 277 ** An instance of the virtual machine.  This structure contains the complete
 278 ** state of the virtual machine.
 279 **
 280 ** The "sqlite3_stmt" structure pointer that is returned by sqlite3_prepare()
 281 ** is really a pointer to an instance of this structure.
 282 **
 283 ** The Vdbe.inVtabMethod variable is set to non-zero for the duration of
 284 ** any virtual table method invocations made by the vdbe program. It is
 285 ** set to 2 for xDestroy method calls and 1 for all other methods. This
 286 ** variable is used for two purposes: to allow xDestroy methods to execute
 287 ** "DROP TABLE" statements and to prevent some nasty side effects of
 288 ** malloc failure when SQLite is invoked recursively by a virtual table
 289 ** method function.
 290 */
 291 struct Vdbe {
 292   sqlite3 *db;            /* The database connection that owns this statement */
 293   Op *aOp;                /* Space to hold the virtual machine's program */
 294   Mem *aMem;              /* The memory locations */
 295   Mem **apArg;            /* Arguments to currently executing user function */
 296   Mem *aColName;          /* Column names to return */
 297   Mem *pResultSet;        /* Pointer to an array of results */
 298   int nMem;               /* Number of memory locations currently allocated */
 299   int nOp;                /* Number of instructions in the program */
 300   int nOpAlloc;           /* Number of slots allocated for aOp[] */
 301   int nLabel;             /* Number of labels used */
 302   int *aLabel;            /* Space to hold the labels */
 303   u16 nResColumn;         /* Number of columns in one row of the result set */
 304   u16 nCursor;            /* Number of slots in apCsr[] */
 305   u32 magic;              /* Magic number for sanity checking */
 306   char *zErrMsg;          /* Error message written here */
 307   Vdbe *pPrev,*pNext;     /* Linked list of VDBEs with the same Vdbe.db */
 308   VdbeCursor **apCsr;     /* One element of this array for each open cursor */
 309   Mem *aVar;              /* Values for the OP_Variable opcode. */
 310   char **azVar;           /* Name of variables */
 311   ynVar nVar;             /* Number of entries in aVar[] */
 312   ynVar nzVar;            /* Number of entries in azVar[] */
 313   u32 cacheCtr;           /* VdbeCursor row cache generation counter */
 314   int pc;                 /* The program counter */
 315   int rc;                 /* Value to return */
 316   u8 errorAction;         /* Recovery action to do in case of an error */
 317   u8 explain;             /* True if EXPLAIN present on SQL command */
 318   u8 changeCntOn;         /* True to update the change-counter */
 319   u8 expired;             /* True if the VM needs to be recompiled */
 320   u8 runOnlyOnce;         /* Automatically expire on reset */
 321   u8 minWriteFileFormat;  /* Minimum file format for writable database files */
 322   u8 inVtabMethod;        /* See comments above */
 323   u8 usesStmtJournal;     /* True if uses a statement journal */
 324   u8 readOnly;            /* True for read-only statements */
 325   u8 isPrepareV2;         /* True if prepared with prepare_v2() */
 326   int nChange;            /* Number of db changes made since last reset */
 327   yDbMask btreeMask;      /* Bitmask of db->aDb[] entries referenced */
 328   yDbMask lockMask;       /* Subset of btreeMask that requires a lock */
 329   int iStatement;         /* Statement number (or 0 if has not opened stmt) */
 330   int aCounter[3];        /* Counters used by sqlite3_stmt_status() */
 331 #ifndef SQLITE_OMIT_TRACE
 332   i64 startTime;          /* Time when query started - used for profiling */
 333 #endif
 334   i64 nFkConstraint;      /* Number of imm. FK constraints this VM */
 335   i64 nStmtDefCons;       /* Number of def. constraints when stmt started */
 336   char *zSql;             /* Text of the SQL statement that generated this */
 337   void *pFree;            /* Free this when deleting the vdbe */
 338 #ifdef SQLITE_DEBUG
 339   FILE *trace;            /* Write an execution trace here, if not NULL */
 340 #endif
 341 #ifdef SQLITE_ENABLE_TREE_EXPLAIN
 342   Explain *pExplain;      /* The explainer */
 343   char *zExplain;         /* Explanation of data structures */
 344 #endif
 345   VdbeFrame *pFrame;      /* Parent frame */
 346   VdbeFrame *pDelFrame;   /* List of frame objects to free on VM reset */
 347   int nFrame;             /* Number of frames in pFrame list */
 348   u32 expmask;            /* Binding to these vars invalidates VM */
 349   SubProgram *pProgram;   /* Linked list of all sub-programs used by VM */
 350   int nOnceFlag;          /* Size of array aOnceFlag[] */
 351   u8 *aOnceFlag;          /* Flags for OP_Once */
 352 };
 353
 354 /*
 355 ** The following are allowed values for Vdbe.magic
 356 */
 357 #define VDBE_MAGIC_INIT     0x26bceaa5    /* Building a VDBE program */
 358 #define VDBE_MAGIC_RUN      0xbdf20da3    /* VDBE is ready to execute */
 359 #define VDBE_MAGIC_HALT     0x519c2973    /* VDBE has completed execution */
 360 #define VDBE_MAGIC_DEAD     0xb606c3c8    /* The VDBE has been deallocated */
 361
 362 /*
 363 ** Function prototypes
 364 */
 365 void sqlite3VdbeFreeCursor(Vdbe *, VdbeCursor*);
 366 void sqliteVdbePopStack(Vdbe*,int);
 367 int sqlite3VdbeCursorMoveto(VdbeCursor*);
 368 #if defined(SQLITE_DEBUG) || defined(VDBE_PROFILE)
 369 void sqlite3VdbePrintOp(FILE*, int, Op*);
 370 #endif
 371 u32 sqlite3VdbeSerialTypeLen(u32);
 372 u32 sqlite3VdbeSerialType(Mem*, int);
 373 u32 sqlite3VdbeSerialPut(unsigned char*, int, Mem*, int);
 374 u32 sqlite3VdbeSerialGet(const unsigned char*, u32, Mem*);
 375 void sqlite3VdbeDeleteAuxData(VdbeFunc*, int);
 376
 377 int sqlite2BtreeKeyCompare(BtCursor *, const void *, int, int, int *);
 378 int sqlite3VdbeIdxKeyCompare(VdbeCursor*,UnpackedRecord*,int*);
 379 int sqlite3VdbeIdxRowid(sqlite3*, BtCursor *, i64 *);
 380 int sqlite3MemCompare(const Mem*, const Mem*, const CollSeq*);
 381 int sqlite3VdbeExec(Vdbe*);
 382 int sqlite3VdbeList(Vdbe*);
 383 int sqlite3VdbeHalt(Vdbe*);
 384 int sqlite3VdbeChangeEncoding(Mem *, int);
 385 int sqlite3VdbeMemTooBig(Mem*);
 386 int sqlite3VdbeMemCopy(Mem*, const Mem*);
 387 void sqlite3VdbeMemShallowCopy(Mem*, const Mem*, int);
 388 void sqlite3VdbeMemMove(Mem*, Mem*);
 389 int sqlite3VdbeMemNulTerminate(Mem*);
 390 int sqlite3VdbeMemSetStr(Mem*, const char*, int, u8, void(*)(void*));
 391 void sqlite3VdbeMemSetInt64(Mem*, i64);
 392 #ifdef SQLITE_OMIT_FLOATING_POINT
 393 # define sqlite3VdbeMemSetDouble sqlite3VdbeMemSetInt64
 394 #else
 395   void sqlite3VdbeMemSetDouble(Mem*, double);
 396 #endif
 397 void sqlite3VdbeMemSetNull(Mem*);
 398 void sqlite3VdbeMemSetZeroBlob(Mem*,int);
 399 void sqlite3VdbeMemSetRowSet(Mem*);
 400 int sqlite3VdbeMemMakeWriteable(Mem*);
 401 int sqlite3VdbeMemStringify(Mem*, int);
 402 i64 sqlite3VdbeIntValue(Mem*);
 403 int sqlite3VdbeMemIntegerify(Mem*);
 404 double sqlite3VdbeRealValue(Mem*);
 405 void sqlite3VdbeIntegerAffinity(Mem*);
 406 int sqlite3VdbeMemRealify(Mem*);
 407 int sqlite3VdbeMemNumerify(Mem*);
 408 int sqlite3VdbeMemFromBtree(BtCursor*,int,int,int,Mem*);
 409 void sqlite3VdbeMemRelease(Mem *p);
 410 void sqlite3VdbeMemReleaseExternal(Mem *p);
 411 #define VdbeMemRelease(X)  \
 412   if((X)->flags&(MEM_Agg|MEM_Dyn|MEM_RowSet|MEM_Frame)) \
 413     sqlite3VdbeMemReleaseExternal(X);
 414 int sqlite3VdbeMemFinalize(Mem*, FuncDef*);
 415 const char *sqlite3OpcodeName(int);
 416 int sqlite3VdbeMemGrow(Mem *pMem, int n, int preserve);
 417 int sqlite3VdbeCloseStatement(Vdbe *, int);
 418 void sqlite3VdbeFrameDelete(VdbeFrame*);
 419 int sqlite3VdbeFrameRestore(VdbeFrame *);
 420 void sqlite3VdbeMemStoreType(Mem *pMem);
 421 int sqlite3VdbeTransferError(Vdbe *p);
 422
 423 #ifdef SQLITE_OMIT_MERGE_SORT
 424 # define sqlite3VdbeSorterInit(Y,Z)      SQLITE_OK
 425 # define sqlite3VdbeSorterWrite(X,Y,Z)   SQLITE_OK
 426 # define sqlite3VdbeSorterClose(Y,Z)
 427 # define sqlite3VdbeSorterRowkey(Y,Z)    SQLITE_OK
 428 # define sqlite3VdbeSorterRewind(X,Y,Z)  SQLITE_OK
 429 # define sqlite3VdbeSorterNext(X,Y,Z)    SQLITE_OK
 430 # define sqlite3VdbeSorterCompare(X,Y,Z) SQLITE_OK
 431 #else
 432 int sqlite3VdbeSorterInit(sqlite3 *, VdbeCursor *);
 433 void sqlite3VdbeSorterClose(sqlite3 *, VdbeCursor *);
 434 int sqlite3VdbeSorterRowkey(VdbeCursor *, Mem *);
 435 int sqlite3VdbeSorterNext(sqlite3 *, VdbeCursor *, int *);
 436 int sqlite3VdbeSorterRewind(sqlite3 *, VdbeCursor *, int *);
 437 int sqlite3VdbeSorterWrite(sqlite3 *, VdbeCursor *, Mem *);
 438 int sqlite3VdbeSorterCompare(VdbeCursor *, Mem *, int *);
 439 #endif
 440
 441 #if !defined(SQLITE_OMIT_SHARED_CACHE) && SQLITE_THREADSAFE>0
 442   void sqlite3VdbeEnter(Vdbe*);
 443   void sqlite3VdbeLeave(Vdbe*);
 444 #else
 445 # define sqlite3VdbeEnter(X)
 446 # define sqlite3VdbeLeave(X)
 447 #endif
 448
 449 #ifdef SQLITE_DEBUG
 450 void sqlite3VdbeMemAboutToChange(Vdbe*,Mem*);
 451 #endif
 452
 453 #ifndef SQLITE_OMIT_FOREIGN_KEY
 454 int sqlite3VdbeCheckFk(Vdbe *, int);
 455 #else
 456 # define sqlite3VdbeCheckFk(p,i) 0
 457 #endif
 458
 459 int sqlite3VdbeMemTranslate(Mem*, u8);
 460 #ifdef SQLITE_DEBUG
 461   void sqlite3VdbePrintSql(Vdbe*);
 462   void sqlite3VdbeMemPrettyPrint(Mem *pMem, char *zBuf);
 463 #endif
 464 int sqlite3VdbeMemHandleBom(Mem *pMem);
 465
 466 #ifndef SQLITE_OMIT_INCRBLOB
 467   int sqlite3VdbeMemExpandBlob(Mem *);
 468   #define ExpandBlob(P) (((P)->flags&MEM_Zero)?sqlite3VdbeMemExpandBlob(P):0)
 469 #else
 470   #define sqlite3VdbeMemExpandBlob(x) SQLITE_OK
 471   #define ExpandBlob(P) SQLITE_OK
 472 #endif
 473
 474 #endif /* !defined(_VDBEINT_H_) */