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   Bool seekHit:1;         /* See the OP_SeekHit and OP_IfNoHope opcodes */
  89   Btree *pBtx;            /* Separate file holding temporary table */
  90   i64 seqCount;           /* Sequence counter */
  91   int *aAltMap;           /* Mapping from table to index column numbers */
  92
  93   /* Cached OP_Column parse information is only valid if cacheStatus matches
  94   ** Vdbe.cacheCtr.  Vdbe.cacheCtr will never take on the value of
  95   ** CACHE_STALE (0) and so setting cacheStatus=CACHE_STALE guarantees that
  96   ** the cache is out of date. */
  97   u32 cacheStatus;        /* Cache is valid if this matches Vdbe.cacheCtr */
  98   int seekResult;         /* Result of previous sqlite3BtreeMoveto() or 0
  99                           ** if there have been no prior seeks on the cursor. */
 100   /* seekResult does not distinguish between "no seeks have ever occurred
 101   ** on this cursor" and "the most recent seek was an exact match".
 102   ** For CURTYPE_PSEUDO, seekResult is the register holding the record */
 103
 104   /* When a new VdbeCursor is allocated, only the fields above are zeroed.
 105   ** The fields that follow are uninitialized, and must be individually
 106   ** initialized prior to first use. */
 107   VdbeCursor *pAltCursor; /* Associated index cursor from which to read */
 108   union {
 109     BtCursor *pCursor;          /* CURTYPE_BTREE or _PSEUDO.  Btree cursor */
 110     sqlite3_vtab_cursor *pVCur; /* CURTYPE_VTAB.              Vtab cursor */
 111     VdbeSorter *pSorter;        /* CURTYPE_SORTER.            Sorter object */
 112   } uc;
 113   KeyInfo *pKeyInfo;      /* Info about index keys needed by index cursors */
 114   u32 iHdrOffset;         /* Offset to next unparsed byte of the header */
 115   Pgno pgnoRoot;          /* Root page of the open btree cursor */
 116   i16 nField;             /* Number of fields in the header */
 117   u16 nHdrParsed;         /* Number of header fields parsed so far */
 118   i64 movetoTarget;       /* Argument to the deferred sqlite3BtreeMoveto() */
 119   u32 *aOffset;           /* Pointer to aType[nField] */
 120   const u8 *aRow;         /* Data for the current row, if all on one page */
 121   u32 payloadSize;        /* Total number of bytes in the record */
 122   u32 szRow;              /* Byte available in aRow */
 123 #ifdef SQLITE_ENABLE_COLUMN_USED_MASK
 124   u64 maskUsed;           /* Mask of columns used by this cursor */
 125 #endif
 126
 127   /* 2*nField extra array elements allocated for aType[], beyond the one
 128   ** static element declared in the structure.  nField total array slots for
 129   ** aType[] and nField+1 array slots for aOffset[] */
 130   u32 aType[1];           /* Type values record decode.  MUST BE LAST */
 131 };
 132
 133
 134 /*
 135 ** A value for VdbeCursor.cacheStatus that means the cache is always invalid.
 136 */
 137 #define CACHE_STALE 0
 138
 139 /*
 140 ** When a sub-program is executed (OP_Program), a structure of this type
 141 ** is allocated to store the current value of the program counter, as
 142 ** well as the current memory cell array and various other frame specific
 143 ** values stored in the Vdbe struct. When the sub-program is finished,
 144 ** these values are copied back to the Vdbe from the VdbeFrame structure,
 145 ** restoring the state of the VM to as it was before the sub-program
 146 ** began executing.
 147 **
 148 ** The memory for a VdbeFrame object is allocated and managed by a memory
 149 ** cell in the parent (calling) frame. When the memory cell is deleted or
 150 ** overwritten, the VdbeFrame object is not freed immediately. Instead, it
 151 ** is linked into the Vdbe.pDelFrame list. The contents of the Vdbe.pDelFrame
 152 ** list is deleted when the VM is reset in VdbeHalt(). The reason for doing
 153 ** this instead of deleting the VdbeFrame immediately is to avoid recursive
 154 ** calls to sqlite3VdbeMemRelease() when the memory cells belonging to the
 155 ** child frame are released.
 156 **
 157 ** The currently executing frame is stored in Vdbe.pFrame. Vdbe.pFrame is
 158 ** set to NULL if the currently executing frame is the main program.
 159 */
 160 typedef struct VdbeFrame VdbeFrame;
 161 struct VdbeFrame {
 162   Vdbe *v;                /* VM this frame belongs to */
 163   VdbeFrame *pParent;     /* Parent of this frame, or NULL if parent is main */
 164   Op *aOp;                /* Program instructions for parent frame */
 165   i64 *anExec;            /* Event counters from parent frame */
 166   Mem *aMem;              /* Array of memory cells for parent frame */
 167   VdbeCursor **apCsr;     /* Array of Vdbe cursors for parent frame */
 168   u8 *aOnce;              /* Bitmask used by OP_Once */
 169   void *token;            /* Copy of SubProgram.token */
 170   i64 lastRowid;          /* Last insert rowid (sqlite3.lastRowid) */
 171   AuxData *pAuxData;      /* Linked list of auxdata allocations */
 172   int nCursor;            /* Number of entries in apCsr */
 173   int pc;                 /* Program Counter in parent (calling) frame */
 174   int nOp;                /* Size of aOp array */
 175   int nMem;               /* Number of entries in aMem */
 176   int nChildMem;          /* Number of memory cells for child frame */
 177   int nChildCsr;          /* Number of cursors for child frame */
 178   int nChange;            /* Statement changes (Vdbe.nChange)     */
 179   int nDbChange;          /* Value of db->nChange */
 180 };
 181
 182 #define VdbeFrameMem(p) ((Mem *)&((u8 *)p)[ROUND8(sizeof(VdbeFrame))])
 183
 184 /*
 185 ** Internally, the vdbe manipulates nearly all SQL values as Mem
 186 ** structures. Each Mem struct may cache multiple representations (string,
 187 ** integer etc.) of the same value.
 188 */
 189 struct sqlite3_value {
 190   union MemValue {
 191     double r;           /* Real value used when MEM_Real is set in flags */
 192     i64 i;              /* Integer value used when MEM_Int is set in flags */
 193     int nZero;          /* Extra zero bytes when MEM_Zero and MEM_Blob set */
 194     const char *zPType; /* Pointer type when MEM_Term|MEM_Subtype|MEM_Null */
 195     FuncDef *pDef;      /* Used only when flags==MEM_Agg */
 196     RowSet *pRowSet;    /* Used only when flags==MEM_RowSet */
 197     VdbeFrame *pFrame;  /* Used when flags==MEM_Frame */
 198   } u;
 199   u16 flags;          /* Some combination of MEM_Null, MEM_Str, MEM_Dyn, etc. */
 200   u8  enc;            /* SQLITE_UTF8, SQLITE_UTF16BE, SQLITE_UTF16LE */
 201   u8  eSubtype;       /* Subtype for this value */
 202   int n;              /* Number of characters in string value, excluding '\0' */
 203   char *z;            /* String or BLOB value */
 204   /* ShallowCopy only needs to copy the information above */
 205   char *zMalloc;      /* Space to hold MEM_Str or MEM_Blob if szMalloc>0 */
 206   int szMalloc;       /* Size of the zMalloc allocation */
 207   u32 uTemp;          /* Transient storage for serial_type in OP_MakeRecord */
 208   sqlite3 *db;        /* The associated database connection */
 209   void (*xDel)(void*);/* Destructor for Mem.z - only valid if MEM_Dyn */
 210 #ifdef SQLITE_DEBUG
 211   Mem *pScopyFrom;    /* This Mem is a shallow copy of pScopyFrom */
 212   void *pFiller;      /* So that sizeof(Mem) is a multiple of 8 */
 213 #endif
 214 };
 215
 216 /*
 217 ** Size of struct Mem not including the Mem.zMalloc member or anything that
 218 ** follows.
 219 */
 220 #define MEMCELLSIZE offsetof(Mem,zMalloc)
 221
 222 /* One or more of the following flags are set to indicate the validOK
 223 ** representations of the value stored in the Mem struct.
 224 **
 225 ** If the MEM_Null flag is set, then the value is an SQL NULL value.
 226 ** For a pointer type created using sqlite3_bind_pointer() or
 227 ** sqlite3_result_pointer() the MEM_Term and MEM_Subtype flags are also set.
 228 **
 229 ** If the MEM_Str flag is set then Mem.z points at a string representation.
 230 ** Usually this is encoded in the same unicode encoding as the main
 231 ** database (see below for exceptions). If the MEM_Term flag is also
 232 ** set, then the string is nul terminated. The MEM_Int and MEM_Real
 233 ** flags may coexist with the MEM_Str flag.
 234 */
 235 #define MEM_Null      0x0001   /* Value is NULL (or a pointer) */
 236 #define MEM_Str       0x0002   /* Value is a string */
 237 #define MEM_Int       0x0004   /* Value is an integer */
 238 #define MEM_Real      0x0008   /* Value is a real number */
 239 #define MEM_Blob      0x0010   /* Value is a BLOB */
 240 #define MEM_AffMask   0x001f   /* Mask of affinity bits */
 241 #define MEM_RowSet    0x0020   /* Value is a RowSet object */
 242 #define MEM_Frame     0x0040   /* Value is a VdbeFrame object */
 243 #define MEM_Undefined 0x0080   /* Value is undefined */
 244 #define MEM_Cleared   0x0100   /* NULL set by OP_Null, not from data */
 245 #define MEM_TypeMask  0xc1ff   /* Mask of type bits */
 246
 247
 248 /* Whenever Mem contains a valid string or blob representation, one of
 249 ** the following flags must be set to determine the memory management
 250 ** policy for Mem.z.  The MEM_Term flag tells us whether or not the
 251 ** string is \000 or \u0000 terminated
 252 */
 253 #define MEM_Term      0x0200   /* String in Mem.z is zero terminated */
 254 #define MEM_Dyn       0x0400   /* Need to call Mem.xDel() on Mem.z */
 255 #define MEM_Static    0x0800   /* Mem.z points to a static string */
 256 #define MEM_Ephem     0x1000   /* Mem.z points to an ephemeral string */
 257 #define MEM_Agg       0x2000   /* Mem.z points to an agg function context */
 258 #define MEM_Zero      0x4000   /* Mem.i contains count of 0s appended to blob */
 259 #define MEM_Subtype   0x8000   /* Mem.eSubtype is valid */
 260 #ifdef SQLITE_OMIT_INCRBLOB
 261   #undef MEM_Zero
 262   #define MEM_Zero 0x0000
 263 #endif
 264
 265 /* Return TRUE if Mem X contains dynamically allocated content - anything
 266 ** that needs to be deallocated to avoid a leak.
 267 */
 268 #define VdbeMemDynamic(X)  \
 269   (((X)->flags&(MEM_Agg|MEM_Dyn|MEM_RowSet|MEM_Frame))!=0)
 270
 271 /*
 272 ** Clear any existing type flags from a Mem and replace them with f
 273 */
 274 #define MemSetTypeFlag(p, f) \
 275    ((p)->flags = ((p)->flags&~(MEM_TypeMask|MEM_Zero))|f)
 276
 277 /*
 278 ** Return true if a memory cell is not marked as invalid.  This macro
 279 ** is for use inside assert() statements only.
 280 */
 281 #ifdef SQLITE_DEBUG
 282 #define memIsValid(M)  ((M)->flags & MEM_Undefined)==0
 283 #endif
 284
 285 /*
 286 ** Each auxiliary data pointer stored by a user defined function
 287 ** implementation calling sqlite3_set_auxdata() is stored in an instance
 288 ** of this structure. All such structures associated with a single VM
 289 ** are stored in a linked list headed at Vdbe.pAuxData. All are destroyed
 290 ** when the VM is halted (if not before).
 291 */
 292 struct AuxData {
 293   int iAuxOp;                     /* Instruction number of OP_Function opcode */
 294   int iAuxArg;                    /* Index of function argument. */
 295   void *pAux;                     /* Aux data pointer */
 296   void (*xDeleteAux)(void*);      /* Destructor for the aux data */
 297   AuxData *pNextAux;              /* Next element in list */
 298 };
 299
 300 /*
 301 ** The "context" argument for an installable function.  A pointer to an
 302 ** instance of this structure is the first argument to the routines used
 303 ** implement the SQL functions.
 304 **
 305 ** There is a typedef for this structure in sqlite.h.  So all routines,
 306 ** even the public interface to SQLite, can use a pointer to this structure.
 307 ** But this file is the only place where the internal details of this
 308 ** structure are known.
 309 **
 310 ** This structure is defined inside of vdbeInt.h because it uses substructures
 311 ** (Mem) which are only defined there.
 312 */
 313 struct sqlite3_context {
 314   Mem *pOut;              /* The return value is stored here */
 315   FuncDef *pFunc;         /* Pointer to function information */
 316   Mem *pMem;              /* Memory cell used to store aggregate context */
 317   Vdbe *pVdbe;            /* The VM that owns this context */
 318   int iOp;                /* Instruction number of OP_Function */
 319   int isError;            /* Error code returned by the function. */
 320   u8 skipFlag;            /* Skip accumulator loading if true */
 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   u32 nWrite;             /* Number of write operations that have occurred */
 384 #endif
 385   u16 nResColumn;         /* Number of columns in one row of the result set */
 386   u8 errorAction;         /* Recovery action to do in case of an error */
 387   u8 minWriteFileFormat;  /* Minimum file format for writable database files */
 388   u8 prepFlags;           /* SQLITE_PREPARE_* flags */
 389   bft expired:1;          /* True if the VM needs to be recompiled */
 390   bft doingRerun:1;       /* True if rerunning after an auto-reprepare */
 391   bft explain:2;          /* True if EXPLAIN present on SQL command */
 392   bft changeCntOn:1;      /* True to update the change-counter */
 393   bft runOnlyOnce:1;      /* Automatically expire on reset */
 394   bft usesStmtJournal:1;  /* True if uses a statement journal */
 395   bft readOnly:1;         /* True for statements that do not write */
 396   bft bIsReader:1;        /* True for statements that read */
 397   yDbMask btreeMask;      /* Bitmask of db->aDb[] entries referenced */
 398   yDbMask lockMask;       /* Subset of btreeMask that requires a lock */
 399   u32 aCounter[7];        /* Counters used by sqlite3_stmt_status() */
 400   char *zSql;             /* Text of the SQL statement that generated this */
 401   void *pFree;            /* Free this when deleting the vdbe */
 402   VdbeFrame *pFrame;      /* Parent frame */
 403   VdbeFrame *pDelFrame;   /* List of frame objects to free on VM reset */
 404   int nFrame;             /* Number of frames in pFrame list */
 405   u32 expmask;            /* Binding to these vars invalidates VM */
 406   SubProgram *pProgram;   /* Linked list of all sub-programs used by VM */
 407   AuxData *pAuxData;      /* Linked list of auxdata allocations */
 408 #ifdef SQLITE_ENABLE_STMT_SCANSTATUS
 409   i64 *anExec;            /* Number of times each op has been executed */
 410   int nScan;              /* Entries in aScan[] */
 411   ScanStatus *aScan;      /* Scan definitions for sqlite3_stmt_scanstatus() */
 412 #endif
 413 };
 414
 415 /*
 416 ** The following are allowed values for Vdbe.magic
 417 */
 418 #define VDBE_MAGIC_INIT     0x16bceaa5    /* Building a VDBE program */
 419 #define VDBE_MAGIC_RUN      0x2df20da3    /* VDBE is ready to execute */
 420 #define VDBE_MAGIC_HALT     0x319c2973    /* VDBE has completed execution */
 421 #define VDBE_MAGIC_RESET    0x48fa9f76    /* Reset and ready to run again */
 422 #define VDBE_MAGIC_DEAD     0x5606c3c8    /* The VDBE has been deallocated */
 423
 424 /*
 425 ** Structure used to store the context required by the
 426 ** sqlite3_preupdate_*() API functions.
 427 */
 428 struct PreUpdate {
 429   Vdbe *v;
 430   VdbeCursor *pCsr;               /* Cursor to read old values from */
 431   int op;                         /* One of SQLITE_INSERT, UPDATE, DELETE */
 432   u8 *aRecord;                    /* old.* database record */
 433   KeyInfo keyinfo;
 434   UnpackedRecord *pUnpacked;      /* Unpacked version of aRecord[] */
 435   UnpackedRecord *pNewUnpacked;   /* Unpacked version of new.* record */
 436   int iNewReg;                    /* Register for new.* values */
 437   i64 iKey1;                      /* First key value passed to hook */
 438   i64 iKey2;                      /* Second key value passed to hook */
 439   Mem *aNew;                      /* Array of new.* values */
 440   Table *pTab;                    /* Schema object being upated */
 441   Index *pPk;                     /* PK index if pTab is WITHOUT ROWID */
 442 };
 443
 444 /*
 445 ** Function prototypes
 446 */
 447 void sqlite3VdbeError(Vdbe*, const char *, ...);
 448 void sqlite3VdbeFreeCursor(Vdbe *, VdbeCursor*);
 449 void sqliteVdbePopStack(Vdbe*,int);
 450 int sqlite3VdbeCursorMoveto(VdbeCursor**, int*);
 451 int sqlite3VdbeCursorRestore(VdbeCursor*);
 452 #if defined(SQLITE_DEBUG) || defined(VDBE_PROFILE)
 453 void sqlite3VdbePrintOp(FILE*, int, Op*);
 454 #endif
 455 u32 sqlite3VdbeSerialTypeLen(u32);
 456 u8 sqlite3VdbeOneByteSerialTypeLen(u8);
 457 u32 sqlite3VdbeSerialType(Mem*, int, u32*);
 458 u32 sqlite3VdbeSerialPut(unsigned char*, Mem*, u32);
 459 u32 sqlite3VdbeSerialGet(const unsigned char*, u32, Mem*);
 460 void sqlite3VdbeDeleteAuxData(sqlite3*, AuxData**, int, int);
 461
 462 int sqlite2BtreeKeyCompare(BtCursor *, const void *, int, int, int *);
 463 int sqlite3VdbeIdxKeyCompare(sqlite3*,VdbeCursor*,UnpackedRecord*,int*);
 464 int sqlite3VdbeIdxRowid(sqlite3*, BtCursor*, i64*);
 465 int sqlite3VdbeExec(Vdbe*);
 466 int sqlite3VdbeList(Vdbe*);
 467 int sqlite3VdbeHalt(Vdbe*);
 468 int sqlite3VdbeChangeEncoding(Mem *, int);
 469 int sqlite3VdbeMemTooBig(Mem*);
 470 int sqlite3VdbeMemCopy(Mem*, const Mem*);
 471 void sqlite3VdbeMemShallowCopy(Mem*, const Mem*, int);
 472 void sqlite3VdbeMemMove(Mem*, Mem*);
 473 int sqlite3VdbeMemNulTerminate(Mem*);
 474 int sqlite3VdbeMemSetStr(Mem*, const char*, int, u8, void(*)(void*));
 475 void sqlite3VdbeMemSetInt64(Mem*, i64);
 476 #ifdef SQLITE_OMIT_FLOATING_POINT
 477 # define sqlite3VdbeMemSetDouble sqlite3VdbeMemSetInt64
 478 #else
 479   void sqlite3VdbeMemSetDouble(Mem*, double);
 480 #endif
 481 void sqlite3VdbeMemSetPointer(Mem*, void*, const char*, void(*)(void*));
 482 void sqlite3VdbeMemInit(Mem*,sqlite3*,u16);
 483 void sqlite3VdbeMemSetNull(Mem*);
 484 void sqlite3VdbeMemSetZeroBlob(Mem*,int);
 485 void sqlite3VdbeMemSetRowSet(Mem*);
 486 int sqlite3VdbeMemMakeWriteable(Mem*);
 487 int sqlite3VdbeMemStringify(Mem*, u8, u8);
 488 i64 sqlite3VdbeIntValue(Mem*);
 489 int sqlite3VdbeMemIntegerify(Mem*);
 490 double sqlite3VdbeRealValue(Mem*);
 491 int sqlite3VdbeBooleanValue(Mem*, int ifNull);
 492 void sqlite3VdbeIntegerAffinity(Mem*);
 493 int sqlite3VdbeMemRealify(Mem*);
 494 int sqlite3VdbeMemNumerify(Mem*);
 495 void sqlite3VdbeMemCast(Mem*,u8,u8);
 496 int sqlite3VdbeMemFromBtree(BtCursor*,u32,u32,Mem*);
 497 void sqlite3VdbeMemRelease(Mem *p);
 498 int sqlite3VdbeMemFinalize(Mem*, FuncDef*);
 499 const char *sqlite3OpcodeName(int);
 500 int sqlite3VdbeMemGrow(Mem *pMem, int n, int preserve);
 501 int sqlite3VdbeMemClearAndResize(Mem *pMem, int n);
 502 int sqlite3VdbeCloseStatement(Vdbe *, int);
 503 void sqlite3VdbeFrameDelete(VdbeFrame*);
 504 int sqlite3VdbeFrameRestore(VdbeFrame *);
 505 #ifdef SQLITE_ENABLE_PREUPDATE_HOOK
 506 void sqlite3VdbePreUpdateHook(Vdbe*,VdbeCursor*,int,const char*,Table*,i64,int);
 507 #endif
 508 int sqlite3VdbeTransferError(Vdbe *p);
 509
 510 int sqlite3VdbeSorterInit(sqlite3 *, int, VdbeCursor *);
 511 void sqlite3VdbeSorterReset(sqlite3 *, VdbeSorter *);
 512 void sqlite3VdbeSorterClose(sqlite3 *, VdbeCursor *);
 513 int sqlite3VdbeSorterRowkey(const VdbeCursor *, Mem *);
 514 int sqlite3VdbeSorterNext(sqlite3 *, const VdbeCursor *);
 515 int sqlite3VdbeSorterRewind(const VdbeCursor *, int *);
 516 int sqlite3VdbeSorterWrite(const VdbeCursor *, Mem *);
 517 int sqlite3VdbeSorterCompare(const VdbeCursor *, Mem *, int, int *);
 518
 519 #ifdef SQLITE_DEBUG
 520   void sqlite3VdbeIncrWriteCounter(Vdbe*, VdbeCursor*);
 521   void sqlite3VdbeAssertAbortable(Vdbe*);
 522 #else
 523 # define sqlite3VdbeIncrWriteCounter(V,C)
 524 # define sqlite3VdbeAssertAbortable(V)
 525 #endif
 526
 527 #if !defined(SQLITE_OMIT_SHARED_CACHE)
 528   void sqlite3VdbeEnter(Vdbe*);
 529 #else
 530 # define sqlite3VdbeEnter(X)
 531 #endif
 532
 533 #if !defined(SQLITE_OMIT_SHARED_CACHE) && SQLITE_THREADSAFE>0
 534   void sqlite3VdbeLeave(Vdbe*);
 535 #else
 536 # define sqlite3VdbeLeave(X)
 537 #endif
 538
 539 #ifdef SQLITE_DEBUG
 540 void sqlite3VdbeMemAboutToChange(Vdbe*,Mem*);
 541 int sqlite3VdbeCheckMemInvariants(Mem*);
 542 #endif
 543
 544 #ifndef SQLITE_OMIT_FOREIGN_KEY
 545 int sqlite3VdbeCheckFk(Vdbe *, int);
 546 #else
 547 # define sqlite3VdbeCheckFk(p,i) 0
 548 #endif
 549
 550 #ifdef SQLITE_DEBUG
 551   void sqlite3VdbePrintSql(Vdbe*);
 552   void sqlite3VdbeMemPrettyPrint(Mem *pMem, char *zBuf);
 553 #endif
 554 #ifndef SQLITE_OMIT_UTF16
 555   int sqlite3VdbeMemTranslate(Mem*, u8);
 556   int sqlite3VdbeMemHandleBom(Mem *pMem);
 557 #endif
 558
 559 #ifndef SQLITE_OMIT_INCRBLOB
 560   int sqlite3VdbeMemExpandBlob(Mem *);
 561   #define ExpandBlob(P) (((P)->flags&MEM_Zero)?sqlite3VdbeMemExpandBlob(P):0)
 562 #else
 563   #define sqlite3VdbeMemExpandBlob(x) SQLITE_OK
 564   #define ExpandBlob(P) SQLITE_OK
 565 #endif
 566
 567 #endif /* !defined(SQLITE_VDBEINT_H) */