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_) */ 475