1 /* 2 ** 2003 September 6 3 ** 4 ** The author disclaims copyright to this source code. In place of 5 ** a legal notice, here is a blessing: 6 ** 7 ** May you do good and not evil. 8 ** May you find forgiveness for yourself and forgive others. 9 ** May you share freely, never taking more than you give. 10 ** 11 ************************************************************************* 12 ** This is the header file for information that is private to the 13 ** VDBE. This information used to all be at the top of the single 14 ** source code file "vdbe.c". When that file became too big (over 15 ** 6000 lines long) it was split up into several smaller files and 16 ** this header information was factored out. 17 */ 18 #ifndef _VDBEINT_H_ 19 #define _VDBEINT_H_ 20 21 /* 22 ** The maximum number of times that a statement will try to reparse 23 ** itself before giving up and returning SQLITE_SCHEMA. 24 */ 25 #ifndef SQLITE_MAX_SCHEMA_RETRY 26 # define SQLITE_MAX_SCHEMA_RETRY 50 27 #endif 28 29 /* 30 ** SQL is translated into a sequence of instructions to be 31 ** executed by a virtual machine. Each instruction is an instance 32 ** of the following structure. 33 */ 34 typedef struct VdbeOp Op; 35 36 /* 37 ** Boolean values 38 */ 39 typedef unsigned Bool; 40 41 /* Opaque type used by code in vdbesort.c */ 42 typedef struct VdbeSorter VdbeSorter; 43 44 /* Opaque type used by the explainer */ 45 typedef struct Explain Explain; 46 47 /* Elements of the linked list at Vdbe.pAuxData */ 48 typedef struct AuxData AuxData; 49 50 /* 51 ** A cursor is a pointer into a single BTree within a database file. 52 ** The cursor can seek to a BTree entry with a particular key, or 53 ** loop over all entries of the Btree. You can also insert new BTree 54 ** entries or retrieve the key or data from the entry that the cursor 55 ** is currently pointing to. 56 ** 57 ** Cursors can also point to virtual tables, sorters, or "pseudo-tables". 58 ** A pseudo-table is a single-row table implemented by registers. 59 ** 60 ** Every cursor that the virtual machine has open is represented by an 61 ** instance of the following structure. 62 */ 63 struct VdbeCursor { 64 BtCursor *pCursor; /* The cursor structure of the backend */ 65 Btree *pBt; /* Separate file holding temporary table */ 66 KeyInfo *pKeyInfo; /* Info about index keys needed by index cursors */ 67 int seekResult; /* Result of previous sqlite3BtreeMoveto() */ 68 int pseudoTableReg; /* Register holding pseudotable content. */ 69 i16 nField; /* Number of fields in the header */ 70 u16 nHdrParsed; /* Number of header fields parsed so far */ 71 #ifdef SQLITE_DEBUG 72 u8 seekOp; /* Most recent seek operation on this cursor */ 73 #endif 74 i8 iDb; /* Index of cursor database in db->aDb[] (or -1) */ 75 u8 nullRow; /* True if pointing to a row with no data */ 76 u8 deferredMoveto; /* A call to sqlite3BtreeMoveto() is needed */ 77 Bool isEphemeral:1; /* True for an ephemeral table */ 78 Bool useRandomRowid:1;/* Generate new record numbers semi-randomly */ 79 Bool isTable:1; /* True if a table requiring integer keys */ 80 Bool isOrdered:1; /* True if the underlying table is BTREE_UNORDERED */ 81 Pgno pgnoRoot; /* Root page of the open btree cursor */ 82 sqlite3_vtab_cursor *pVtabCursor; /* The cursor for a virtual table */ 83 i64 seqCount; /* Sequence counter */ 84 i64 movetoTarget; /* Argument to the deferred sqlite3BtreeMoveto() */ 85 VdbeSorter *pSorter; /* Sorter object for OP_SorterOpen cursors */ 86 #ifdef SQLITE_ENABLE_COLUMN_USED_MASK 87 u64 maskUsed; /* Mask of columns used by this cursor */ 88 #endif 89 90 /* Cached information about the header for the data record that the 91 ** cursor is currently pointing to. Only valid if cacheStatus matches 92 ** Vdbe.cacheCtr. Vdbe.cacheCtr will never take on the value of 93 ** CACHE_STALE and so setting cacheStatus=CACHE_STALE guarantees that 94 ** the cache is out of date. 95 ** 96 ** aRow might point to (ephemeral) data for the current row, or it might 97 ** be NULL. 98 */ 99 u32 cacheStatus; /* Cache is valid if this matches Vdbe.cacheCtr */ 100 u32 payloadSize; /* Total number of bytes in the record */ 101 u32 szRow; /* Byte available in aRow */ 102 u32 iHdrOffset; /* Offset to next unparsed byte of the header */ 103 const u8 *aRow; /* Data for the current row, if all on one page */ 104 u32 *aOffset; /* Pointer to aType[nField] */ 105 u32 aType[1]; /* Type values for all entries in the record */ 106 /* 2*nField extra array elements allocated for aType[], beyond the one 107 ** static element declared in the structure. nField total array slots for 108 ** aType[] and nField+1 array slots for aOffset[] */ 109 }; 110 typedef struct VdbeCursor VdbeCursor; 111 112 /* 113 ** When a sub-program is executed (OP_Program), a structure of this type 114 ** is allocated to store the current value of the program counter, as 115 ** well as the current memory cell array and various other frame specific 116 ** values stored in the Vdbe struct. When the sub-program is finished, 117 ** these values are copied back to the Vdbe from the VdbeFrame structure, 118 ** restoring the state of the VM to as it was before the sub-program 119 ** began executing. 120 ** 121 ** The memory for a VdbeFrame object is allocated and managed by a memory 122 ** cell in the parent (calling) frame. When the memory cell is deleted or 123 ** overwritten, the VdbeFrame object is not freed immediately. Instead, it 124 ** is linked into the Vdbe.pDelFrame list. The contents of the Vdbe.pDelFrame 125 ** list is deleted when the VM is reset in VdbeHalt(). The reason for doing 126 ** this instead of deleting the VdbeFrame immediately is to avoid recursive 127 ** calls to sqlite3VdbeMemRelease() when the memory cells belonging to the 128 ** child frame are released. 129 ** 130 ** The currently executing frame is stored in Vdbe.pFrame. Vdbe.pFrame is 131 ** set to NULL if the currently executing frame is the main program. 132 */ 133 typedef struct VdbeFrame VdbeFrame; 134 struct VdbeFrame { 135 Vdbe *v; /* VM this frame belongs to */ 136 VdbeFrame *pParent; /* Parent of this frame, or NULL if parent is main */ 137 Op *aOp; /* Program instructions for parent frame */ 138 i64 *anExec; /* Event counters from parent frame */ 139 Mem *aMem; /* Array of memory cells for parent frame */ 140 u8 *aOnceFlag; /* Array of OP_Once flags for parent frame */ 141 VdbeCursor **apCsr; /* Array of Vdbe cursors for parent frame */ 142 void *token; /* Copy of SubProgram.token */ 143 i64 lastRowid; /* Last insert rowid (sqlite3.lastRowid) */ 144 int nCursor; /* Number of entries in apCsr */ 145 int pc; /* Program Counter in parent (calling) frame */ 146 int nOp; /* Size of aOp array */ 147 int nMem; /* Number of entries in aMem */ 148 int nOnceFlag; /* Number of entries in aOnceFlag */ 149 int nChildMem; /* Number of memory cells for child frame */ 150 int nChildCsr; /* Number of cursors for child frame */ 151 int nChange; /* Statement changes (Vdbe.nChange) */ 152 int nDbChange; /* Value of db->nChange */ 153 }; 154 155 #define VdbeFrameMem(p) ((Mem *)&((u8 *)p)[ROUND8(sizeof(VdbeFrame))]) 156 157 /* 158 ** A value for VdbeCursor.cacheValid that means the cache is always invalid. 159 */ 160 #define CACHE_STALE 0 161 162 /* 163 ** Internally, the vdbe manipulates nearly all SQL values as Mem 164 ** structures. Each Mem struct may cache multiple representations (string, 165 ** integer etc.) of the same value. 166 */ 167 struct Mem { 168 union MemValue { 169 double r; /* Real value used when MEM_Real is set in flags */ 170 i64 i; /* Integer value used when MEM_Int is set in flags */ 171 int nZero; /* Used when bit MEM_Zero is set in flags */ 172 FuncDef *pDef; /* Used only when flags==MEM_Agg */ 173 RowSet *pRowSet; /* Used only when flags==MEM_RowSet */ 174 VdbeFrame *pFrame; /* Used when flags==MEM_Frame */ 175 } u; 176 u16 flags; /* Some combination of MEM_Null, MEM_Str, MEM_Dyn, etc. */ 177 u8 enc; /* SQLITE_UTF8, SQLITE_UTF16BE, SQLITE_UTF16LE */ 178 int n; /* Number of characters in string value, excluding '\0' */ 179 char *z; /* String or BLOB value */ 180 /* ShallowCopy only needs to copy the information above */ 181 char *zMalloc; /* Space to hold MEM_Str or MEM_Blob if szMalloc>0 */ 182 int szMalloc; /* Size of the zMalloc allocation */ 183 u32 uTemp; /* Transient storage for serial_type in OP_MakeRecord */ 184 sqlite3 *db; /* The associated database connection */ 185 void (*xDel)(void*);/* Destructor for Mem.z - only valid if MEM_Dyn */ 186 #ifdef SQLITE_DEBUG 187 Mem *pScopyFrom; /* This Mem is a shallow copy of pScopyFrom */ 188 void *pFiller; /* So that sizeof(Mem) is a multiple of 8 */ 189 #endif 190 }; 191 192 /* 193 ** Size of struct Mem not including the Mem.zMalloc member or anything that 194 ** follows. 195 */ 196 #define MEMCELLSIZE offsetof(Mem,zMalloc) 197 198 /* One or more of the following flags are set to indicate the validOK 199 ** representations of the value stored in the Mem struct. 200 ** 201 ** If the MEM_Null flag is set, then the value is an SQL NULL value. 202 ** No other flags may be set in this case. 203 ** 204 ** If the MEM_Str flag is set then Mem.z points at a string representation. 205 ** Usually this is encoded in the same unicode encoding as the main 206 ** database (see below for exceptions). If the MEM_Term flag is also 207 ** set, then the string is nul terminated. The MEM_Int and MEM_Real 208 ** flags may coexist with the MEM_Str flag. 209 */ 210 #define MEM_Null 0x0001 /* Value is NULL */ 211 #define MEM_Str 0x0002 /* Value is a string */ 212 #define MEM_Int 0x0004 /* Value is an integer */ 213 #define MEM_Real 0x0008 /* Value is a real number */ 214 #define MEM_Blob 0x0010 /* Value is a BLOB */ 215 #define MEM_AffMask 0x001f /* Mask of affinity bits */ 216 #define MEM_RowSet 0x0020 /* Value is a RowSet object */ 217 #define MEM_Frame 0x0040 /* Value is a VdbeFrame object */ 218 #define MEM_Undefined 0x0080 /* Value is undefined */ 219 #define MEM_Cleared 0x0100 /* NULL set by OP_Null, not from data */ 220 #define MEM_TypeMask 0x01ff /* Mask of type bits */ 221 222 223 /* Whenever Mem contains a valid string or blob representation, one of 224 ** the following flags must be set to determine the memory management 225 ** policy for Mem.z. The MEM_Term flag tells us whether or not the 226 ** string is \000 or \u0000 terminated 227 */ 228 #define MEM_Term 0x0200 /* String rep is nul terminated */ 229 #define MEM_Dyn 0x0400 /* Need to call Mem.xDel() on Mem.z */ 230 #define MEM_Static 0x0800 /* Mem.z points to a static string */ 231 #define MEM_Ephem 0x1000 /* Mem.z points to an ephemeral string */ 232 #define MEM_Agg 0x2000 /* Mem.z points to an agg function context */ 233 #define MEM_Zero 0x4000 /* Mem.i contains count of 0s appended to blob */ 234 #ifdef SQLITE_OMIT_INCRBLOB 235 #undef MEM_Zero 236 #define MEM_Zero 0x0000 237 #endif 238 239 /* 240 ** Clear any existing type flags from a Mem and replace them with f 241 */ 242 #define MemSetTypeFlag(p, f) \ 243 ((p)->flags = ((p)->flags&~(MEM_TypeMask|MEM_Zero))|f) 244 245 /* 246 ** Return true if a memory cell is not marked as invalid. This macro 247 ** is for use inside assert() statements only. 248 */ 249 #ifdef SQLITE_DEBUG 250 #define memIsValid(M) ((M)->flags & MEM_Undefined)==0 251 #endif 252 253 /* 254 ** Each auxiliary data pointer stored by a user defined function 255 ** implementation calling sqlite3_set_auxdata() is stored in an instance 256 ** of this structure. All such structures associated with a single VM 257 ** are stored in a linked list headed at Vdbe.pAuxData. All are destroyed 258 ** when the VM is halted (if not before). 259 */ 260 struct AuxData { 261 int iOp; /* Instruction number of OP_Function opcode */ 262 int iArg; /* Index of function argument. */ 263 void *pAux; /* Aux data pointer */ 264 void (*xDelete)(void *); /* Destructor for the aux data */ 265 AuxData *pNext; /* Next element in list */ 266 }; 267 268 /* 269 ** The "context" argument for an installable function. A pointer to an 270 ** instance of this structure is the first argument to the routines used 271 ** implement the SQL functions. 272 ** 273 ** There is a typedef for this structure in sqlite.h. So all routines, 274 ** even the public interface to SQLite, can use a pointer to this structure. 275 ** But this file is the only place where the internal details of this 276 ** structure are known. 277 ** 278 ** This structure is defined inside of vdbeInt.h because it uses substructures 279 ** (Mem) which are only defined there. 280 */ 281 struct sqlite3_context { 282 Mem *pOut; /* The return value is stored here */ 283 FuncDef *pFunc; /* Pointer to function information */ 284 Mem *pMem; /* Memory cell used to store aggregate context */ 285 Vdbe *pVdbe; /* The VM that owns this context */ 286 int iOp; /* Instruction number of OP_Function */ 287 int isError; /* Error code returned by the function. */ 288 u8 skipFlag; /* Skip accumulator loading if true */ 289 u8 fErrorOrAux; /* isError!=0 or pVdbe->pAuxData modified */ 290 }; 291 292 /* 293 ** An Explain object accumulates indented output which is helpful 294 ** in describing recursive data structures. 295 */ 296 struct Explain { 297 Vdbe *pVdbe; /* Attach the explanation to this Vdbe */ 298 StrAccum str; /* The string being accumulated */ 299 int nIndent; /* Number of elements in aIndent */ 300 u16 aIndent[100]; /* Levels of indentation */ 301 char zBase[100]; /* Initial space */ 302 }; 303 304 /* A bitfield type for use inside of structures. Always follow with :N where 305 ** N is the number of bits. 306 */ 307 typedef unsigned bft; /* Bit Field Type */ 308 309 typedef struct ScanStatus ScanStatus; 310 struct ScanStatus { 311 int addrExplain; /* OP_Explain for loop */ 312 int addrLoop; /* Address of "loops" counter */ 313 int addrVisit; /* Address of "rows visited" counter */ 314 int iSelectID; /* The "Select-ID" for this loop */ 315 LogEst nEst; /* Estimated output rows per loop */ 316 char *zName; /* Name of table or index */ 317 }; 318 319 /* 320 ** An instance of the virtual machine. This structure contains the complete 321 ** state of the virtual machine. 322 ** 323 ** The "sqlite3_stmt" structure pointer that is returned by sqlite3_prepare() 324 ** is really a pointer to an instance of this structure. 325 */ 326 struct Vdbe { 327 sqlite3 *db; /* The database connection that owns this statement */ 328 Op *aOp; /* Space to hold the virtual machine's program */ 329 Mem *aMem; /* The memory locations */ 330 Mem **apArg; /* Arguments to currently executing user function */ 331 Mem *aColName; /* Column names to return */ 332 Mem *pResultSet; /* Pointer to an array of results */ 333 Parse *pParse; /* Parsing context used to create this Vdbe */ 334 int nMem; /* Number of memory locations currently allocated */ 335 int nOp; /* Number of instructions in the program */ 336 int nCursor; /* Number of slots in apCsr[] */ 337 u32 magic; /* Magic number for sanity checking */ 338 char *zErrMsg; /* Error message written here */ 339 Vdbe *pPrev,*pNext; /* Linked list of VDBEs with the same Vdbe.db */ 340 VdbeCursor **apCsr; /* One element of this array for each open cursor */ 341 Mem *aVar; /* Values for the OP_Variable opcode. */ 342 char **azVar; /* Name of variables */ 343 ynVar nVar; /* Number of entries in aVar[] */ 344 ynVar nzVar; /* Number of entries in azVar[] */ 345 u32 cacheCtr; /* VdbeCursor row cache generation counter */ 346 int pc; /* The program counter */ 347 int rc; /* Value to return */ 348 #ifdef SQLITE_DEBUG 349 int rcApp; /* errcode set by sqlite3_result_error_code() */ 350 #endif 351 u16 nResColumn; /* Number of columns in one row of the result set */ 352 u8 errorAction; /* Recovery action to do in case of an error */ 353 u8 minWriteFileFormat; /* Minimum file format for writable database files */ 354 bft explain:2; /* True if EXPLAIN present on SQL command */ 355 bft changeCntOn:1; /* True to update the change-counter */ 356 bft expired:1; /* True if the VM needs to be recompiled */ 357 bft runOnlyOnce:1; /* Automatically expire on reset */ 358 bft usesStmtJournal:1; /* True if uses a statement journal */ 359 bft readOnly:1; /* True for statements that do not write */ 360 bft bIsReader:1; /* True for statements that read */ 361 bft isPrepareV2:1; /* True if prepared with prepare_v2() */ 362 bft doingRerun:1; /* True if rerunning after an auto-reprepare */ 363 int nChange; /* Number of db changes made since last reset */ 364 yDbMask btreeMask; /* Bitmask of db->aDb[] entries referenced */ 365 yDbMask lockMask; /* Subset of btreeMask that requires a lock */ 366 int iStatement; /* Statement number (or 0 if has not opened stmt) */ 367 u32 aCounter[5]; /* Counters used by sqlite3_stmt_status() */ 368 #ifndef SQLITE_OMIT_TRACE 369 i64 startTime; /* Time when query started - used for profiling */ 370 #endif 371 i64 iCurrentTime; /* Value of julianday('now') for this statement */ 372 i64 nFkConstraint; /* Number of imm. FK constraints this VM */ 373 i64 nStmtDefCons; /* Number of def. constraints when stmt started */ 374 i64 nStmtDefImmCons; /* Number of def. imm constraints when stmt started */ 375 char *zSql; /* Text of the SQL statement that generated this */ 376 void *pFree; /* Free this when deleting the vdbe */ 377 VdbeFrame *pFrame; /* Parent frame */ 378 VdbeFrame *pDelFrame; /* List of frame objects to free on VM reset */ 379 int nFrame; /* Number of frames in pFrame list */ 380 u32 expmask; /* Binding to these vars invalidates VM */ 381 SubProgram *pProgram; /* Linked list of all sub-programs used by VM */ 382 int nOnceFlag; /* Size of array aOnceFlag[] */ 383 u8 *aOnceFlag; /* Flags for OP_Once */ 384 AuxData *pAuxData; /* Linked list of auxdata allocations */ 385 #ifdef SQLITE_ENABLE_STMT_SCANSTATUS 386 i64 *anExec; /* Number of times each op has been executed */ 387 int nScan; /* Entries in aScan[] */ 388 ScanStatus *aScan; /* Scan definitions for sqlite3_stmt_scanstatus() */ 389 #endif 390 }; 391 392 /* 393 ** The following are allowed values for Vdbe.magic 394 */ 395 #define VDBE_MAGIC_INIT 0x26bceaa5 /* Building a VDBE program */ 396 #define VDBE_MAGIC_RUN 0xbdf20da3 /* VDBE is ready to execute */ 397 #define VDBE_MAGIC_HALT 0x519c2973 /* VDBE has completed execution */ 398 #define VDBE_MAGIC_DEAD 0xb606c3c8 /* The VDBE has been deallocated */ 399 400 /* 401 ** Function prototypes 402 */ 403 void sqlite3VdbeError(Vdbe*, const char *, ...); 404 void sqlite3VdbeFreeCursor(Vdbe *, VdbeCursor*); 405 void sqliteVdbePopStack(Vdbe*,int); 406 int sqlite3VdbeCursorMoveto(VdbeCursor*); 407 int sqlite3VdbeCursorRestore(VdbeCursor*); 408 #if defined(SQLITE_DEBUG) || defined(VDBE_PROFILE) 409 void sqlite3VdbePrintOp(FILE*, int, Op*); 410 #endif 411 u32 sqlite3VdbeSerialTypeLen(u32); 412 u32 sqlite3VdbeSerialType(Mem*, int); 413 u32 sqlite3VdbeSerialPut(unsigned char*, Mem*, u32); 414 u32 sqlite3VdbeSerialGet(const unsigned char*, u32, Mem*); 415 void sqlite3VdbeDeleteAuxData(Vdbe*, int, int); 416 417 int sqlite2BtreeKeyCompare(BtCursor *, const void *, int, int, int *); 418 int sqlite3VdbeIdxKeyCompare(sqlite3*,VdbeCursor*,UnpackedRecord*,int*); 419 int sqlite3VdbeIdxRowid(sqlite3*, BtCursor*, i64*); 420 int sqlite3VdbeExec(Vdbe*); 421 int sqlite3VdbeList(Vdbe*); 422 int sqlite3VdbeHalt(Vdbe*); 423 int sqlite3VdbeChangeEncoding(Mem *, int); 424 int sqlite3VdbeMemTooBig(Mem*); 425 int sqlite3VdbeMemCopy(Mem*, const Mem*); 426 void sqlite3VdbeMemShallowCopy(Mem*, const Mem*, int); 427 void sqlite3VdbeMemMove(Mem*, Mem*); 428 int sqlite3VdbeMemNulTerminate(Mem*); 429 int sqlite3VdbeMemSetStr(Mem*, const char*, int, u8, void(*)(void*)); 430 void sqlite3VdbeMemSetInt64(Mem*, i64); 431 #ifdef SQLITE_OMIT_FLOATING_POINT 432 # define sqlite3VdbeMemSetDouble sqlite3VdbeMemSetInt64 433 #else 434 void sqlite3VdbeMemSetDouble(Mem*, double); 435 #endif 436 void sqlite3VdbeMemInit(Mem*,sqlite3*,u16); 437 void sqlite3VdbeMemSetNull(Mem*); 438 void sqlite3VdbeMemSetZeroBlob(Mem*,int); 439 void sqlite3VdbeMemSetRowSet(Mem*); 440 int sqlite3VdbeMemMakeWriteable(Mem*); 441 int sqlite3VdbeMemStringify(Mem*, u8, u8); 442 i64 sqlite3VdbeIntValue(Mem*); 443 int sqlite3VdbeMemIntegerify(Mem*); 444 double sqlite3VdbeRealValue(Mem*); 445 void sqlite3VdbeIntegerAffinity(Mem*); 446 int sqlite3VdbeMemRealify(Mem*); 447 int sqlite3VdbeMemNumerify(Mem*); 448 void sqlite3VdbeMemCast(Mem*,u8,u8); 449 int sqlite3VdbeMemFromBtree(BtCursor*,u32,u32,int,Mem*); 450 void sqlite3VdbeMemRelease(Mem *p); 451 #define VdbeMemDynamic(X) \ 452 (((X)->flags&(MEM_Agg|MEM_Dyn|MEM_RowSet|MEM_Frame))!=0) 453 int sqlite3VdbeMemFinalize(Mem*, FuncDef*); 454 const char *sqlite3OpcodeName(int); 455 int sqlite3VdbeMemGrow(Mem *pMem, int n, int preserve); 456 int sqlite3VdbeMemClearAndResize(Mem *pMem, int n); 457 int sqlite3VdbeCloseStatement(Vdbe *, int); 458 void sqlite3VdbeFrameDelete(VdbeFrame*); 459 int sqlite3VdbeFrameRestore(VdbeFrame *); 460 int sqlite3VdbeTransferError(Vdbe *p); 461 462 int sqlite3VdbeSorterInit(sqlite3 *, int, VdbeCursor *); 463 void sqlite3VdbeSorterReset(sqlite3 *, VdbeSorter *); 464 void sqlite3VdbeSorterClose(sqlite3 *, VdbeCursor *); 465 int sqlite3VdbeSorterRowkey(const VdbeCursor *, Mem *); 466 int sqlite3VdbeSorterNext(sqlite3 *, const VdbeCursor *, int *); 467 int sqlite3VdbeSorterRewind(const VdbeCursor *, int *); 468 int sqlite3VdbeSorterWrite(const VdbeCursor *, Mem *); 469 int sqlite3VdbeSorterCompare(const VdbeCursor *, Mem *, int, int *); 470 471 #if !defined(SQLITE_OMIT_SHARED_CACHE) && SQLITE_THREADSAFE>0 472 void sqlite3VdbeEnter(Vdbe*); 473 void sqlite3VdbeLeave(Vdbe*); 474 #else 475 # define sqlite3VdbeEnter(X) 476 # define sqlite3VdbeLeave(X) 477 #endif 478 479 #ifdef SQLITE_DEBUG 480 void sqlite3VdbeMemAboutToChange(Vdbe*,Mem*); 481 int sqlite3VdbeCheckMemInvariants(Mem*); 482 #endif 483 484 #ifndef SQLITE_OMIT_FOREIGN_KEY 485 int sqlite3VdbeCheckFk(Vdbe *, int); 486 #else 487 # define sqlite3VdbeCheckFk(p,i) 0 488 #endif 489 490 int sqlite3VdbeMemTranslate(Mem*, u8); 491 #ifdef SQLITE_DEBUG 492 void sqlite3VdbePrintSql(Vdbe*); 493 void sqlite3VdbeMemPrettyPrint(Mem *pMem, char *zBuf); 494 #endif 495 int sqlite3VdbeMemHandleBom(Mem *pMem); 496 497 #ifndef SQLITE_OMIT_INCRBLOB 498 int sqlite3VdbeMemExpandBlob(Mem *); 499 #define ExpandBlob(P) (((P)->flags&MEM_Zero)?sqlite3VdbeMemExpandBlob(P):0) 500 #else 501 #define sqlite3VdbeMemExpandBlob(x) SQLITE_OK 502 #define ExpandBlob(P) SQLITE_OK 503 #endif 504 505 #endif /* !defined(_VDBEINT_H_) */ 506