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 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   Pgno pgnoRoot;        /* Root page of the open btree cursor */
  89   i16 nField;           /* Number of fields in the header */
  90   u16 nHdrParsed;       /* Number of header fields parsed so far */
  91   union {
  92     BtCursor *pCursor;          /* CURTYPE_BTREE.  Btree cursor */
  93     sqlite3_vtab_cursor *pVCur; /* CURTYPE_VTAB.   Vtab cursor */
  94     int pseudoTableReg;         /* CURTYPE_PSEUDO. Reg holding content. */
  95     VdbeSorter *pSorter;        /* CURTYPE_SORTER. Sorter object */
  96   } uc;
  97   Btree *pBt;           /* Separate file holding temporary table */
  98   KeyInfo *pKeyInfo;    /* Info about index keys needed by index cursors */
  99   int seekResult;       /* Result of previous sqlite3BtreeMoveto() */
 100   i64 seqCount;         /* Sequence counter */
 101   i64 movetoTarget;     /* Argument to the deferred sqlite3BtreeMoveto() */
 102   VdbeCursor *pAltCursor; /* Associated index cursor from which to read */
 103   int *aAltMap;           /* Mapping from table to index column numbers */
 104 #ifdef SQLITE_ENABLE_COLUMN_USED_MASK
 105   u64 maskUsed;         /* Mask of columns used by this cursor */
 106 #endif
 107
 108   /* Cached information about the header for the data record that the
 109   ** cursor is currently pointing to.  Only valid if cacheStatus matches
 110   ** Vdbe.cacheCtr.  Vdbe.cacheCtr will never take on the value of
 111   ** CACHE_STALE and so setting cacheStatus=CACHE_STALE guarantees that
 112   ** the cache is out of date.
 113   **
 114   ** aRow might point to (ephemeral) data for the current row, or it might
 115   ** be NULL.
 116   */
 117   u32 cacheStatus;      /* Cache is valid if this matches Vdbe.cacheCtr */
 118   u32 payloadSize;      /* Total number of bytes in the record */
 119   u32 szRow;            /* Byte available in aRow */
 120   u32 iHdrOffset;       /* Offset to next unparsed byte of the header */
 121   const u8 *aRow;       /* Data for the current row, if all on one page */
 122   u32 *aOffset;         /* Pointer to aType[nField] */
 123   u32 aType[1];         /* Type values for all entries in the record */
 124   /* 2*nField extra array elements allocated for aType[], beyond the one
 125   ** static element declared in the structure.  nField total array slots for
 126   ** aType[] and nField+1 array slots for aOffset[] */
 127 };
 128
 129
 130 /*
 131 ** A value for VdbeCursor.cacheStatus that means the cache is always invalid.
 132 */
 133 #define CACHE_STALE 0
 134
 135 /*
 136 ** When a sub-program is executed (OP_Program), a structure of this type
 137 ** is allocated to store the current value of the program counter, as
 138 ** well as the current memory cell array and various other frame specific
 139 ** values stored in the Vdbe struct. When the sub-program is finished,
 140 ** these values are copied back to the Vdbe from the VdbeFrame structure,
 141 ** restoring the state of the VM to as it was before the sub-program
 142 ** began executing.
 143 **
 144 ** The memory for a VdbeFrame object is allocated and managed by a memory
 145 ** cell in the parent (calling) frame. When the memory cell is deleted or
 146 ** overwritten, the VdbeFrame object is not freed immediately. Instead, it
 147 ** is linked into the Vdbe.pDelFrame list. The contents of the Vdbe.pDelFrame
 148 ** list is deleted when the VM is reset in VdbeHalt(). The reason for doing
 149 ** this instead of deleting the VdbeFrame immediately is to avoid recursive
 150 ** calls to sqlite3VdbeMemRelease() when the memory cells belonging to the
 151 ** child frame are released.
 152 **
 153 ** The currently executing frame is stored in Vdbe.pFrame. Vdbe.pFrame is
 154 ** set to NULL if the currently executing frame is the main program.
 155 */
 156 typedef struct VdbeFrame VdbeFrame;
 157 struct VdbeFrame {
 158   Vdbe *v;                /* VM this frame belongs to */
 159   VdbeFrame *pParent;     /* Parent of this frame, or NULL if parent is main */
 160   Op *aOp;                /* Program instructions for parent frame */
 161   i64 *anExec;            /* Event counters from parent frame */
 162   Mem *aMem;              /* Array of memory cells for parent frame */
 163   VdbeCursor **apCsr;     /* Array of Vdbe cursors for parent frame */
 164   void *token;            /* Copy of SubProgram.token */
 165   i64 lastRowid;          /* Last insert rowid (sqlite3.lastRowid) */
 166   AuxData *pAuxData;      /* Linked list of auxdata allocations */
 167   int nCursor;            /* Number of entries in apCsr */
 168   int pc;                 /* Program Counter in parent (calling) frame */
 169   int nOp;                /* Size of aOp array */
 170   int nMem;               /* Number of entries in aMem */
 171   int nChildMem;          /* Number of memory cells for child frame */
 172   int nChildCsr;          /* Number of cursors for child frame */
 173   int nChange;            /* Statement changes (Vdbe.nChange)     */
 174   int nDbChange;          /* Value of db->nChange */
 175 };
 176
 177 #define VdbeFrameMem(p) ((Mem *)&((u8 *)p)[ROUND8(sizeof(VdbeFrame))])
 178
 179 /*
 180 ** Internally, the vdbe manipulates nearly all SQL values as Mem
 181 ** structures. Each Mem struct may cache multiple representations (string,
 182 ** integer etc.) of the same value.
 183 */
 184 struct Mem {
 185   union MemValue {
 186     double r;           /* Real value used when MEM_Real is set in flags */
 187     i64 i;              /* Integer value used when MEM_Int is set in flags */
 188     int nZero;          /* Used when bit MEM_Zero is set in flags */
 189     FuncDef *pDef;      /* Used only when flags==MEM_Agg */
 190     RowSet *pRowSet;    /* Used only when flags==MEM_RowSet */
 191     VdbeFrame *pFrame;  /* Used when flags==MEM_Frame */
 192   } u;
 193   u16 flags;          /* Some combination of MEM_Null, MEM_Str, MEM_Dyn, etc. */
 194   u8  enc;            /* SQLITE_UTF8, SQLITE_UTF16BE, SQLITE_UTF16LE */
 195   u8  eSubtype;       /* Subtype for this value */
 196   int n;              /* Number of characters in string value, excluding '\0' */
 197   char *z;            /* String or BLOB value */
 198   /* ShallowCopy only needs to copy the information above */
 199   char *zMalloc;      /* Space to hold MEM_Str or MEM_Blob if szMalloc>0 */
 200   int szMalloc;       /* Size of the zMalloc allocation */
 201   u32 uTemp;          /* Transient storage for serial_type in OP_MakeRecord */
 202   sqlite3 *db;        /* The associated database connection */
 203   void (*xDel)(void*);/* Destructor for Mem.z - only valid if MEM_Dyn */
 204 #ifdef SQLITE_DEBUG
 205   Mem *pScopyFrom;    /* This Mem is a shallow copy of pScopyFrom */
 206   void *pFiller;      /* So that sizeof(Mem) is a multiple of 8 */
 207 #endif
 208 };
 209
 210 /*
 211 ** Size of struct Mem not including the Mem.zMalloc member or anything that
 212 ** follows.
 213 */
 214 #define MEMCELLSIZE offsetof(Mem,zMalloc)
 215
 216 /* One or more of the following flags are set to indicate the validOK
 217 ** representations of the value stored in the Mem struct.
 218 **
 219 ** If the MEM_Null flag is set, then the value is an SQL NULL value.
 220 ** No other flags may be set in this case.
 221 **
 222 ** If the MEM_Str flag is set then Mem.z points at a string representation.
 223 ** Usually this is encoded in the same unicode encoding as the main
 224 ** database (see below for exceptions). If the MEM_Term flag is also
 225 ** set, then the string is nul terminated. The MEM_Int and MEM_Real
 226 ** flags may coexist with the MEM_Str flag.
 227 */
 228 #define MEM_Null      0x0001   /* Value is NULL */
 229 #define MEM_Str       0x0002   /* Value is a string */
 230 #define MEM_Int       0x0004   /* Value is an integer */
 231 #define MEM_Real      0x0008   /* Value is a real number */
 232 #define MEM_Blob      0x0010   /* Value is a BLOB */
 233 #define MEM_AffMask   0x001f   /* Mask of affinity bits */
 234 #define MEM_RowSet    0x0020   /* Value is a RowSet object */
 235 #define MEM_Frame     0x0040   /* Value is a VdbeFrame object */
 236 #define MEM_Undefined 0x0080   /* Value is undefined */
 237 #define MEM_Cleared   0x0100   /* NULL set by OP_Null, not from data */
 238 #define MEM_TypeMask  0x81ff   /* Mask of type bits */
 239
 240
 241 /* Whenever Mem contains a valid string or blob representation, one of
 242 ** the following flags must be set to determine the memory management
 243 ** policy for Mem.z.  The MEM_Term flag tells us whether or not the
 244 ** string is \000 or \u0000 terminated
 245 */
 246 #define MEM_Term      0x0200   /* String rep is nul terminated */
 247 #define MEM_Dyn       0x0400   /* Need to call Mem.xDel() on Mem.z */
 248 #define MEM_Static    0x0800   /* Mem.z points to a static string */
 249 #define MEM_Ephem     0x1000   /* Mem.z points to an ephemeral string */
 250 #define MEM_Agg       0x2000   /* Mem.z points to an agg function context */
 251 #define MEM_Zero      0x4000   /* Mem.i contains count of 0s appended to blob */
 252 #define MEM_Subtype   0x8000   /* Mem.eSubtype is valid */
 253 #ifdef SQLITE_OMIT_INCRBLOB
 254   #undef MEM_Zero
 255   #define MEM_Zero 0x0000
 256 #endif
 257
 258 /* Return TRUE if Mem X contains dynamically allocated content - anything
 259 ** that needs to be deallocated to avoid a leak.
 260 */
 261 #define VdbeMemDynamic(X)  \
 262   (((X)->flags&(MEM_Agg|MEM_Dyn|MEM_RowSet|MEM_Frame))!=0)
 263
 264 /*
 265 ** Clear any existing type flags from a Mem and replace them with f
 266 */
 267 #define MemSetTypeFlag(p, f) \
 268    ((p)->flags = ((p)->flags&~(MEM_TypeMask|MEM_Zero))|f)
 269
 270 /*
 271 ** Return true if a memory cell is not marked as invalid.  This macro
 272 ** is for use inside assert() statements only.
 273 */
 274 #ifdef SQLITE_DEBUG
 275 #define memIsValid(M)  ((M)->flags & MEM_Undefined)==0
 276 #endif
 277
 278 /*
 279 ** Each auxiliary data pointer stored by a user defined function
 280 ** implementation calling sqlite3_set_auxdata() is stored in an instance
 281 ** of this structure. All such structures associated with a single VM
 282 ** are stored in a linked list headed at Vdbe.pAuxData. All are destroyed
 283 ** when the VM is halted (if not before).
 284 */
 285 struct AuxData {
 286   int iOp;                        /* Instruction number of OP_Function opcode */
 287   int iArg;                       /* Index of function argument. */
 288   void *pAux;                     /* Aux data pointer */
 289   void (*xDelete)(void *);        /* Destructor for the aux data */
 290   AuxData *pNext;                 /* Next element in list */
 291 };
 292
 293 /*
 294 ** The "context" argument for an installable function.  A pointer to an
 295 ** instance of this structure is the first argument to the routines used
 296 ** implement the SQL functions.
 297 **
 298 ** There is a typedef for this structure in sqlite.h.  So all routines,
 299 ** even the public interface to SQLite, can use a pointer to this structure.
 300 ** But this file is the only place where the internal details of this
 301 ** structure are known.
 302 **
 303 ** This structure is defined inside of vdbeInt.h because it uses substructures
 304 ** (Mem) which are only defined there.
 305 */
 306 struct sqlite3_context {
 307   Mem *pOut;              /* The return value is stored here */
 308   FuncDef *pFunc;         /* Pointer to function information */
 309   Mem *pMem;              /* Memory cell used to store aggregate context */
 310   Vdbe *pVdbe;            /* The VM that owns this context */
 311   int iOp;                /* Instruction number of OP_Function */
 312   int isError;            /* Error code returned by the function. */
 313   u8 skipFlag;            /* Skip accumulator loading if true */
 314   u8 fErrorOrAux;         /* isError!=0 or pVdbe->pAuxData modified */
 315   u8 argc;                /* Number of arguments */
 316   sqlite3_value *argv[1]; /* Argument set */
 317 };
 318
 319 /* A bitfield type for use inside of structures.  Always follow with :N where
 320 ** N is the number of bits.
 321 */
 322 typedef unsigned bft;  /* Bit Field Type */
 323
 324 typedef struct ScanStatus ScanStatus;
 325 struct ScanStatus {
 326   int addrExplain;                /* OP_Explain for loop */
 327   int addrLoop;                   /* Address of "loops" counter */
 328   int addrVisit;                  /* Address of "rows visited" counter */
 329   int iSelectID;                  /* The "Select-ID" for this loop */
 330   LogEst nEst;                    /* Estimated output rows per loop */
 331   char *zName;                    /* Name of table or index */
 332 };
 333
 334 /*
 335 ** An instance of the virtual machine.  This structure contains the complete
 336 ** state of the virtual machine.
 337 **
 338 ** The "sqlite3_stmt" structure pointer that is returned by sqlite3_prepare()
 339 ** is really a pointer to an instance of this structure.
 340 */
 341 struct Vdbe {
 342   sqlite3 *db;            /* The database connection that owns this statement */
 343   Vdbe *pPrev,*pNext;     /* Linked list of VDBEs with the same Vdbe.db */
 344   Parse *pParse;          /* Parsing context used to create this Vdbe */
 345   ynVar nVar;             /* Number of entries in aVar[] */
 346   ynVar nzVar;            /* Number of entries in azVar[] */
 347   u32 magic;              /* Magic number for sanity checking */
 348   int nMem;               /* Number of memory locations currently allocated */
 349   int nCursor;            /* Number of slots in apCsr[] */
 350   u32 cacheCtr;           /* VdbeCursor row cache generation counter */
 351   int pc;                 /* The program counter */
 352   int rc;                 /* Value to return */
 353   int nChange;            /* Number of db changes made since last reset */
 354   int iStatement;         /* Statement number (or 0 if has not opened stmt) */
 355   i64 iCurrentTime;       /* Value of julianday('now') for this statement */
 356   i64 nFkConstraint;      /* Number of imm. FK constraints this VM */
 357   i64 nStmtDefCons;       /* Number of def. constraints when stmt started */
 358   i64 nStmtDefImmCons;    /* Number of def. imm constraints when stmt started */
 359
 360   /* When allocating a new Vdbe object, all of the fields below should be
 361   ** initialized to zero or NULL */
 362
 363   Op *aOp;                /* Space to hold the virtual machine's program */
 364   Mem *aMem;              /* The memory locations */
 365   Mem **apArg;            /* Arguments to currently executing user function */
 366   Mem *aColName;          /* Column names to return */
 367   Mem *pResultSet;        /* Pointer to an array of results */
 368   char *zErrMsg;          /* Error message written here */
 369   VdbeCursor **apCsr;     /* One element of this array for each open cursor */
 370   Mem *aVar;              /* Values for the OP_Variable opcode. */
 371   char **azVar;           /* Name of variables */
 372 #ifndef SQLITE_OMIT_TRACE
 373   i64 startTime;          /* Time when query started - used for profiling */
 374 #endif
 375   int nOp;                /* Number of instructions in the program */
 376 #ifdef SQLITE_DEBUG
 377   int rcApp;              /* errcode set by sqlite3_result_error_code() */
 378 #endif
 379   u16 nResColumn;         /* Number of columns in one row of the result set */
 380   u8 errorAction;         /* Recovery action to do in case of an error */
 381   u8 minWriteFileFormat;  /* Minimum file format for writable database files */
 382   bft expired:1;          /* True if the VM needs to be recompiled */
 383   bft doingRerun:1;       /* True if rerunning after an auto-reprepare */
 384   bft explain:2;          /* True if EXPLAIN present on SQL command */
 385   bft changeCntOn:1;      /* True to update the change-counter */
 386   bft runOnlyOnce:1;      /* Automatically expire on reset */
 387   bft usesStmtJournal:1;  /* True if uses a statement journal */
 388   bft readOnly:1;         /* True for statements that do not write */
 389   bft bIsReader:1;        /* True for statements that read */
 390   bft isPrepareV2:1;      /* True if prepared with prepare_v2() */
 391   yDbMask btreeMask;      /* Bitmask of db->aDb[] entries referenced */
 392   yDbMask lockMask;       /* Subset of btreeMask that requires a lock */
 393   u32 aCounter[5];        /* Counters used by sqlite3_stmt_status() */
 394   char *zSql;             /* Text of the SQL statement that generated this */
 395   void *pFree;            /* Free this when deleting the vdbe */
 396   VdbeFrame *pFrame;      /* Parent frame */
 397   VdbeFrame *pDelFrame;   /* List of frame objects to free on VM reset */
 398   int nFrame;             /* Number of frames in pFrame list */
 399   u32 expmask;            /* Binding to these vars invalidates VM */
 400   SubProgram *pProgram;   /* Linked list of all sub-programs used by VM */
 401   AuxData *pAuxData;      /* Linked list of auxdata allocations */
 402 #ifdef SQLITE_ENABLE_STMT_SCANSTATUS
 403   i64 *anExec;            /* Number of times each op has been executed */
 404   int nScan;              /* Entries in aScan[] */
 405   ScanStatus *aScan;      /* Scan definitions for sqlite3_stmt_scanstatus() */
 406 #endif
 407 };
 408
 409 /*
 410 ** The following are allowed values for Vdbe.magic
 411 */
 412 #define VDBE_MAGIC_INIT     0x16bceaa5    /* Building a VDBE program */
 413 #define VDBE_MAGIC_RUN      0x2df20da3    /* VDBE is ready to execute */
 414 #define VDBE_MAGIC_HALT     0x319c2973    /* VDBE has completed execution */
 415 #define VDBE_MAGIC_RESET    0x48fa9f76    /* Reset and ready to run again */
 416 #define VDBE_MAGIC_DEAD     0x5606c3c8    /* The VDBE has been deallocated */
 417
 418 /*
 419 ** Structure used to store the context required by the
 420 ** sqlite3_preupdate_*() API functions.
 421 */
 422 struct PreUpdate {
 423   Vdbe *v;
 424   VdbeCursor *pCsr;               /* Cursor to read old values from */
 425   int op;                         /* One of SQLITE_INSERT, UPDATE, DELETE */
 426   u8 *aRecord;                    /* old.* database record */
 427   KeyInfo keyinfo;
 428   UnpackedRecord *pUnpacked;      /* Unpacked version of aRecord[] */
 429   UnpackedRecord *pNewUnpacked;   /* Unpacked version of new.* record */
 430   int iNewReg;                    /* Register for new.* values */
 431   i64 iKey1;                      /* First key value passed to hook */
 432   i64 iKey2;                      /* Second key value passed to hook */
 433   Mem *aNew;                      /* Array of new.* values */
 434   Table *pTab;                    /* Schema object being upated */
 435 };
 436
 437 /*
 438 ** Function prototypes
 439 */
 440 void sqlite3VdbeError(Vdbe*, const char *, ...);
 441 void sqlite3VdbeFreeCursor(Vdbe *, VdbeCursor*);
 442 void sqliteVdbePopStack(Vdbe*,int);
 443 int sqlite3VdbeCursorMoveto(VdbeCursor**, int*);
 444 int sqlite3VdbeCursorRestore(VdbeCursor*);
 445 #if defined(SQLITE_DEBUG) || defined(VDBE_PROFILE)
 446 void sqlite3VdbePrintOp(FILE*, int, Op*);
 447 #endif
 448 u32 sqlite3VdbeSerialTypeLen(u32);
 449 u8 sqlite3VdbeOneByteSerialTypeLen(u8);
 450 u32 sqlite3VdbeSerialType(Mem*, int, u32*);
 451 u32 sqlite3VdbeSerialPut(unsigned char*, Mem*, u32);
 452 u32 sqlite3VdbeSerialGet(const unsigned char*, u32, Mem*);
 453 void sqlite3VdbeDeleteAuxData(sqlite3*, AuxData**, int, int);
 454
 455 int sqlite2BtreeKeyCompare(BtCursor *, const void *, int, int, int *);
 456 int sqlite3VdbeIdxKeyCompare(sqlite3*,VdbeCursor*,UnpackedRecord*,int*);
 457 int sqlite3VdbeIdxRowid(sqlite3*, BtCursor*, i64*);
 458 int sqlite3VdbeExec(Vdbe*);
 459 int sqlite3VdbeList(Vdbe*);
 460 int sqlite3VdbeHalt(Vdbe*);
 461 int sqlite3VdbeChangeEncoding(Mem *, int);
 462 int sqlite3VdbeMemTooBig(Mem*);
 463 int sqlite3VdbeMemCopy(Mem*, const Mem*);
 464 void sqlite3VdbeMemShallowCopy(Mem*, const Mem*, int);
 465 void sqlite3VdbeMemMove(Mem*, Mem*);
 466 int sqlite3VdbeMemNulTerminate(Mem*);
 467 int sqlite3VdbeMemSetStr(Mem*, const char*, int, u8, void(*)(void*));
 468 void sqlite3VdbeMemSetInt64(Mem*, i64);
 469 #ifdef SQLITE_OMIT_FLOATING_POINT
 470 # define sqlite3VdbeMemSetDouble sqlite3VdbeMemSetInt64
 471 #else
 472   void sqlite3VdbeMemSetDouble(Mem*, double);
 473 #endif
 474 void sqlite3VdbeMemInit(Mem*,sqlite3*,u16);
 475 void sqlite3VdbeMemSetNull(Mem*);
 476 void sqlite3VdbeMemSetZeroBlob(Mem*,int);
 477 void sqlite3VdbeMemSetRowSet(Mem*);
 478 int sqlite3VdbeMemMakeWriteable(Mem*);
 479 int sqlite3VdbeMemStringify(Mem*, u8, u8);
 480 i64 sqlite3VdbeIntValue(Mem*);
 481 int sqlite3VdbeMemIntegerify(Mem*);
 482 double sqlite3VdbeRealValue(Mem*);
 483 void sqlite3VdbeIntegerAffinity(Mem*);
 484 int sqlite3VdbeMemRealify(Mem*);
 485 int sqlite3VdbeMemNumerify(Mem*);
 486 void sqlite3VdbeMemCast(Mem*,u8,u8);
 487 int sqlite3VdbeMemFromBtree(BtCursor*,u32,u32,int,Mem*);
 488 void sqlite3VdbeMemRelease(Mem *p);
 489 int sqlite3VdbeMemFinalize(Mem*, FuncDef*);
 490 const char *sqlite3OpcodeName(int);
 491 int sqlite3VdbeMemGrow(Mem *pMem, int n, int preserve);
 492 int sqlite3VdbeMemClearAndResize(Mem *pMem, int n);
 493 int sqlite3VdbeCloseStatement(Vdbe *, int);
 494 void sqlite3VdbeFrameDelete(VdbeFrame*);
 495 int sqlite3VdbeFrameRestore(VdbeFrame *);
 496 #ifdef SQLITE_ENABLE_PREUPDATE_HOOK
 497 void sqlite3VdbePreUpdateHook(Vdbe*,VdbeCursor*,int,const char*,Table*,i64,int);
 498 #endif
 499 int sqlite3VdbeTransferError(Vdbe *p);
 500
 501 int sqlite3VdbeSorterInit(sqlite3 *, int, VdbeCursor *);
 502 void sqlite3VdbeSorterReset(sqlite3 *, VdbeSorter *);
 503 void sqlite3VdbeSorterClose(sqlite3 *, VdbeCursor *);
 504 int sqlite3VdbeSorterRowkey(const VdbeCursor *, Mem *);
 505 int sqlite3VdbeSorterNext(sqlite3 *, const VdbeCursor *, int *);
 506 int sqlite3VdbeSorterRewind(const VdbeCursor *, int *);
 507 int sqlite3VdbeSorterWrite(const VdbeCursor *, Mem *);
 508 int sqlite3VdbeSorterCompare(const VdbeCursor *, Mem *, int, int *);
 509
 510 #if !defined(SQLITE_OMIT_SHARED_CACHE)
 511   void sqlite3VdbeEnter(Vdbe*);
 512 #else
 513 # define sqlite3VdbeEnter(X)
 514 #endif
 515
 516 #if !defined(SQLITE_OMIT_SHARED_CACHE) && SQLITE_THREADSAFE>0
 517   void sqlite3VdbeLeave(Vdbe*);
 518 #else
 519 # define sqlite3VdbeLeave(X)
 520 #endif
 521
 522 #ifdef SQLITE_DEBUG
 523 void sqlite3VdbeMemAboutToChange(Vdbe*,Mem*);
 524 int sqlite3VdbeCheckMemInvariants(Mem*);
 525 #endif
 526
 527 #ifndef SQLITE_OMIT_FOREIGN_KEY
 528 int sqlite3VdbeCheckFk(Vdbe *, int);
 529 #else
 530 # define sqlite3VdbeCheckFk(p,i) 0
 531 #endif
 532
 533 int sqlite3VdbeMemTranslate(Mem*, u8);
 534 #ifdef SQLITE_DEBUG
 535   void sqlite3VdbePrintSql(Vdbe*);
 536   void sqlite3VdbeMemPrettyPrint(Mem *pMem, char *zBuf);
 537 #endif
 538 int sqlite3VdbeMemHandleBom(Mem *pMem);
 539
 540 #ifndef SQLITE_OMIT_INCRBLOB
 541   int sqlite3VdbeMemExpandBlob(Mem *);
 542   #define ExpandBlob(P) (((P)->flags&MEM_Zero)?sqlite3VdbeMemExpandBlob(P):0)
 543 #else
 544   #define sqlite3VdbeMemExpandBlob(x) SQLITE_OK
 545   #define ExpandBlob(P) SQLITE_OK
 546 #endif
 547
 548 #endif /* !defined(SQLITE_VDBEINT_H) */