/*** 2001 September 15**** The author disclaims copyright to this source code. In place of** a legal notice, here is a blessing:**** May you do good and not evil.** May you find forgiveness for yourself and forgive others.** May you share freely, never taking more than you give.***************************************************************************** Internal interface definitions for SQLite.**** @(#) $Id: sqliteInt.h,v 1.752 2008/08/04 20:13:27 drh Exp $*/#ifndef _SQLITEINT_H_#define _SQLITEINT_H_/*** Include the configuration header output by 'configure' if we're using the** autoconf-based build*/#ifdef _HAVE_SQLITE_CONFIG_H#include "config.h"#endif#include "sqliteLimit.h"/* Disable nuisance warnings on Borland compilers */#if defined(__BORLANDC__)#pragma warn -rch /* unreachable code */#pragma warn -ccc /* Condition is always true or false */#pragma warn -aus /* Assigned value is never used */#pragma warn -csu /* Comparing signed and unsigned */#pragma warn -spa /* Suspicous pointer arithmetic */#endif/* Needed for various definitions... */#ifndef _GNU_SOURCE# define _GNU_SOURCE#endif/*** Include standard header files as necessary*/#ifdef HAVE_STDINT_H#include <stdint.h>#endif#ifdef HAVE_INTTYPES_H#include <inttypes.h>#endif/*** A macro used to aid in coverage testing. When doing coverage** testing, the condition inside the argument must be evaluated ** both true and false in order to get full branch coverage.** This macro can be inserted to ensure adequate test coverage** in places where simple condition/decision coverage is inadequate.*/#ifdef SQLITE_COVERAGE_TEST void sqlite3Coverage(int);# define testcase(X) if( X ){ sqlite3Coverage(__LINE__); }#else# define testcase(X)#endif/*** The ALWAYS and NEVER macros surround boolean expressions which ** are intended to always be true or false, respectively. Such** expressions could be omitted from the code completely. But they** are included in a few cases in order to enhance the resilience** of SQLite to unexpected behavior - to make the code "self-healing"** or "ductile" rather than being "brittle" and crashing at the first** hint of unplanned behavior.**** When doing coverage testing ALWAYS and NEVER are hard-coded to** be true and false so that the unreachable code then specify will** not be counted as untested code.*/#ifdef SQLITE_COVERAGE_TEST# define ALWAYS(X) (1)# define NEVER(X) (0)#else# define ALWAYS(X) (X)# define NEVER(X) (X)#endif/*** The macro unlikely() is a hint that surrounds a boolean** expression that is usually false. Macro likely() surrounds** a boolean expression that is usually true. GCC is able to** use these hints to generate better code, sometimes.*/#if defined(__GNUC__) && 0# define likely(X) __builtin_expect((X),1)# define unlikely(X) __builtin_expect((X),0)#else# define likely(X) !!(X)# define unlikely(X) !!(X)#endif/* * This macro is used to "hide" some ugliness in casting an int * value to a ptr value under the MSVC 64-bit compiler. Casting * non 64-bit values to ptr types results in a "hard" error with * the MSVC 64-bit compiler which this attempts to avoid. * * A simple compiler pragma or casting sequence could not be found * to correct this in all situations, so this macro was introduced. * * It could be argued that the intptr_t type could be used in this * case, but that type is not available on all compilers, or * requires the #include of specific headers which differs between * platforms. */#define SQLITE_INT_TO_PTR(X) ((void*)&((char*)0)[X])#define SQLITE_PTR_TO_INT(X) ((int)(((char*)X)-(char*)0))/*** These #defines should enable >2GB file support on Posix if the** underlying operating system supports it. If the OS lacks** large file support, or if the OS is windows, these should be no-ops.**** Ticket #2739: The _LARGEFILE_SOURCE macro must appear before any** system #includes. Hence, this block of code must be the very first** code in all source files.**** Large file support can be disabled using the -DSQLITE_DISABLE_LFS switch** on the compiler command line. This is necessary if you are compiling** on a recent machine (ex: RedHat 7.2) but you want your code to work** on an older machine (ex: RedHat 6.0). If you compile on RedHat 7.2** without this option, LFS is enable. But LFS does not exist in the kernel** in RedHat 6.0, so the code won't work. Hence, for maximum binary** portability you should omit LFS.**** Similar is true for MacOS. LFS is only supported on MacOS 9 and later.*/#ifndef SQLITE_DISABLE_LFS# define _LARGE_FILE 1# ifndef _FILE_OFFSET_BITS# define _FILE_OFFSET_BITS 64# endif# define _LARGEFILE_SOURCE 1#endif/*** The SQLITE_THREADSAFE macro must be defined as either 0 or 1.** Older versions of SQLite used an optional THREADSAFE macro.** We support that for legacy*/#if !defined(SQLITE_THREADSAFE)#if defined(THREADSAFE)# define SQLITE_THREADSAFE THREADSAFE#else# define SQLITE_THREADSAFE 1#endif#endif/*** Exactly one of the following macros must be defined in order to** specify which memory allocation subsystem to use.**** SQLITE_SYSTEM_MALLOC // Use normal system malloc()** SQLITE_MEMDEBUG // Debugging version of system malloc()** SQLITE_MEMORY_SIZE // internal allocator #1** SQLITE_MMAP_HEAP_SIZE // internal mmap() allocator** SQLITE_POW2_MEMORY_SIZE // internal power-of-two allocator**** If none of the above are defined, then set SQLITE_SYSTEM_MALLOC as** the default.*/#if defined(SQLITE_SYSTEM_MALLOC)+defined(SQLITE_MEMDEBUG)+\ defined(SQLITE_MEMORY_SIZE)+defined(SQLITE_MMAP_HEAP_SIZE)+\ defined(SQLITE_POW2_MEMORY_SIZE)>1# error "At most one of the following compile-time configuration options\ is allows: SQLITE_SYSTEM_MALLOC, SQLITE_MEMDEBUG, SQLITE_MEMORY_SIZE,\ SQLITE_MMAP_HEAP_SIZE, SQLITE_POW2_MEMORY_SIZE"#endif#if defined(SQLITE_SYSTEM_MALLOC)+defined(SQLITE_MEMDEBUG)+\ defined(SQLITE_MEMORY_SIZE)+defined(SQLITE_MMAP_HEAP_SIZE)+\ defined(SQLITE_POW2_MEMORY_SIZE)==0# define SQLITE_SYSTEM_MALLOC 1#endif/*** If SQLITE_MALLOC_SOFT_LIMIT is defined, then try to keep the** sizes of memory allocations below this value where possible.*/#if defined(SQLITE_POW2_MEMORY_SIZE) && !defined(SQLITE_MALLOC_SOFT_LIMIT)# define SQLITE_MALLOC_SOFT_LIMIT 1024#endif/*** We need to define _XOPEN_SOURCE as follows in order to enable** recursive mutexes on most unix systems. But Mac OS X is different.** The _XOPEN_SOURCE define causes problems for Mac OS X we are told,** so it is omitted there. See ticket #2673.**** Later we learn that _XOPEN_SOURCE is poorly or incorrectly** implemented on some systems. So we avoid defining it at all** if it is already defined or if it is unneeded because we are** not doing a threadsafe build. Ticket #2681.**** See also ticket #2741.*/#if !defined(_XOPEN_SOURCE) && !defined(__DARWIN__) && !defined(__APPLE__) && SQLITE_THREADSAFE# define _XOPEN_SOURCE 500 /* Needed to enable pthread recursive mutexes */#endif#if defined(SQLITE_TCL) || defined(TCLSH)# include <tcl.h>#endif/*** Many people are failing to set -DNDEBUG=1 when compiling SQLite.** Setting NDEBUG makes the code smaller and run faster. So the following** lines are added to automatically set NDEBUG unless the -DSQLITE_DEBUG=1** option is set. Thus NDEBUG becomes an opt-in rather than an opt-out** feature.*/#if !defined(NDEBUG) && !defined(SQLITE_DEBUG) # define NDEBUG 1#endif#include "sqlite3.h"#include "hash.h"#include "parse.h"#include <stdio.h>#include <stdlib.h>#include <string.h>#include <assert.h>#include <stddef.h>/*** If compiling for a processor that lacks floating point support,** substitute integer for floating-point*/#ifdef SQLITE_OMIT_FLOATING_POINT# define double sqlite_int64# define LONGDOUBLE_TYPE sqlite_int64# ifndef SQLITE_BIG_DBL# define SQLITE_BIG_DBL (0x7fffffffffffffff)# endif# define SQLITE_OMIT_DATETIME_FUNCS 1# define SQLITE_OMIT_TRACE 1# undef SQLITE_MIXED_ENDIAN_64BIT_FLOAT#endif#ifndef SQLITE_BIG_DBL# define SQLITE_BIG_DBL (1e99)#endif/*** OMIT_TEMPDB is set to 1 if SQLITE_OMIT_TEMPDB is defined, or 0** afterward. Having this macro allows us to cause the C compiler ** to omit code used by TEMP tables without messy #ifndef statements.*/#ifdef SQLITE_OMIT_TEMPDB#define OMIT_TEMPDB 1#else#define OMIT_TEMPDB 0#endif/*** If the following macro is set to 1, then NULL values are considered** distinct when determining whether or not two entries are the same** in a UNIQUE index. This is the way PostgreSQL, Oracle, DB2, MySQL,** OCELOT, and Firebird all work. The SQL92 spec explicitly says this** is the way things are suppose to work.**** If the following macro is set to 0, the NULLs are indistinct for** a UNIQUE index. In this mode, you can only have a single NULL entry** for a column declared UNIQUE. This is the way Informix and SQL Server** work.*/#define NULL_DISTINCT_FOR_UNIQUE 1/*** The "file format" number is an integer that is incremented whenever** the VDBE-level file format changes. The following macros define the** the default file format for new databases and the maximum file format** that the library can read.*/#define SQLITE_MAX_FILE_FORMAT 4#ifndef SQLITE_DEFAULT_FILE_FORMAT# define SQLITE_DEFAULT_FILE_FORMAT 1#endif/*** Provide a default value for SQLITE_TEMP_STORE in case it is not specified** on the command-line*/#ifndef SQLITE_TEMP_STORE# define SQLITE_TEMP_STORE 1#endif/*** GCC does not define the offsetof() macro so we'll have to do it** ourselves.*/#ifndef offsetof#define offsetof(STRUCTURE,FIELD) ((int)((char*)&((STRUCTURE*)0)->FIELD))#endif/*** Check to see if this machine uses EBCDIC. (Yes, believe it or** not, there are still machines out there that use EBCDIC.)*/#if 'A' == '\301'# define SQLITE_EBCDIC 1#else# define SQLITE_ASCII 1#endif/*** Integers of known sizes. These typedefs might change for architectures** where the sizes very. Preprocessor macros are available so that the** types can be conveniently redefined at compile-type. Like this:**** cc '-DUINTPTR_TYPE=long long int' ...*/#ifndef UINT32_TYPE# ifdef HAVE_UINT32_T# define UINT32_TYPE uint32_t# else# define UINT32_TYPE unsigned int# endif#endif#ifndef UINT16_TYPE# ifdef HAVE_UINT16_T# define UINT16_TYPE uint16_t# else# define UINT16_TYPE unsigned short int# endif#endif#ifndef INT16_TYPE# ifdef HAVE_INT16_T# define INT16_TYPE int16_t# else# define INT16_TYPE short int# endif#endif#ifndef UINT8_TYPE# ifdef HAVE_UINT8_T# define UINT8_TYPE uint8_t# else# define UINT8_TYPE unsigned char# endif#endif#ifndef INT8_TYPE# ifdef HAVE_INT8_T# define INT8_TYPE int8_t# else# define INT8_TYPE signed char# endif#endif#ifndef LONGDOUBLE_TYPE# define LONGDOUBLE_TYPE long double#endiftypedef sqlite_int64 i64; /* 8-byte signed integer */typedef sqlite_uint64 u64; /* 8-byte unsigned integer */typedef UINT32_TYPE u32; /* 4-byte unsigned integer */typedef UINT16_TYPE u16; /* 2-byte unsigned integer */typedef INT16_TYPE i16; /* 2-byte signed integer */typedef UINT8_TYPE u8; /* 1-byte unsigned integer */typedef UINT8_TYPE i8; /* 1-byte signed integer *//*** Macros to determine whether the machine is big or little endian,** evaluated at runtime.*/#ifdef SQLITE_AMALGAMATIONconst int sqlite3one;#elseextern const int sqlite3one;#endif#if defined(i386) || defined(__i386__) || defined(_M_IX86)# define SQLITE_BIGENDIAN 0# define SQLITE_LITTLEENDIAN 1# define SQLITE_UTF16NATIVE SQLITE_UTF16LE#else# define SQLITE_BIGENDIAN (*(char *)(&sqlite3one)==0)# define SQLITE_LITTLEENDIAN (*(char *)(&sqlite3one)==1)# define SQLITE_UTF16NATIVE (SQLITE_BIGENDIAN?SQLITE_UTF16BE:SQLITE_UTF16LE)#endif/*** Constants for the largest and smallest possible 64-bit signed integers.** These macros are designed to work correctly on both 32-bit and 64-bit** compilers.*/#define LARGEST_INT64 (0xffffffff|(((i64)0x7fffffff)<<32))#define SMALLEST_INT64 (((i64)-1) - LARGEST_INT64)/*** An instance of the following structure is used to store the busy-handler** callback for a given sqlite handle. **** The sqlite.busyHandler member of the sqlite struct contains the busy** callback for the database handle. Each pager opened via the sqlite** handle is passed a pointer to sqlite.busyHandler. The busy-handler** callback is currently invoked only from within pager.c.*/typedef struct BusyHandler BusyHandler;struct BusyHandler { int (*xFunc)(void *,int); /* The busy callback */ void *pArg; /* First arg to busy callback */ int nBusy; /* Incremented with each busy call */};/*** Name of the master database table. The master database table** is a special table that holds the names and attributes of all** user tables and indices.*/#define MASTER_NAME "sqlite_master"#define TEMP_MASTER_NAME "sqlite_temp_master"/*** The root-page of the master database table.*/#define MASTER_ROOT 1/*** The name of the schema table.*/#define SCHEMA_TABLE(x) ((!OMIT_TEMPDB)&&(x==1)?TEMP_MASTER_NAME:MASTER_NAME)/*** A convenience macro that returns the number of elements in** an array.*/#define ArraySize(X) (sizeof(X)/sizeof(X[0]))/*** The following value as a destructor means to use sqlite3DbFree().** This is an internal extension to SQLITE_STATIC and SQLITE_TRANSIENT.*/#define SQLITE_DYNAMIC ((sqlite3_destructor_type)sqlite3DbFree)/*** Forward references to structures*/typedef struct AggInfo AggInfo;typedef struct AuthContext AuthContext;typedef struct Bitvec Bitvec;typedef struct CollSeq CollSeq;typedef struct Column Column;typedef struct Db Db;typedef struct Schema Schema;typedef struct Expr Expr;typedef struct ExprList ExprList;typedef struct FKey FKey;typedef struct FuncDef FuncDef;typedef struct IdList IdList;typedef struct Index Index;typedef struct KeyClass KeyClass;typedef struct KeyInfo KeyInfo;typedef struct Lookaside Lookaside;typedef struct LookasideSlot LookasideSlot;typedef struct Module Module;typedef struct NameContext NameContext;typedef struct Parse Parse;typedef struct Select Select;typedef struct SrcList SrcList;typedef struct StrAccum StrAccum;typedef struct Table Table;typedef struct TableLock TableLock;typedef struct Token Token;typedef struct TriggerStack TriggerStack;typedef struct TriggerStep TriggerStep;typedef struct Trigger Trigger;typedef struct WhereInfo WhereInfo;typedef struct WhereLevel WhereLevel;/*** Defer sourcing vdbe.h and btree.h until after the "u8" and ** "BusyHandler" typedefs. vdbe.h also requires a few of the opaque** pointer types (i.e. FuncDef) defined above.*/#include "btree.h"#include "vdbe.h"#include "pager.h"#include "os.h"#include "mutex.h"/*** Each database file to be accessed by the system is an instance** of the following structure. There are normally two of these structures** in the sqlite.aDb[] array. aDb[0] is the main database file and** aDb[1] is the database file used to hold temporary tables. Additional** databases may be attached.*/struct Db { char *zName; /* Name of this database */ Btree *pBt; /* The B*Tree structure for this database file */ u8 inTrans; /* 0: not writable. 1: Transaction. 2: Checkpoint */ u8 safety_level; /* How aggressive at synching data to disk */ void *pAux; /* Auxiliary data. Usually NULL */ void (*xFreeAux)(void*); /* Routine to free pAux */ Schema *pSchema; /* Pointer to database schema (possibly shared) */};/*** An instance of the following structure stores a database schema.**** If there are no virtual tables configured in this schema, the** Schema.db variable is set to NULL. After the first virtual table** has been added, it is set to point to the database connection ** used to create the connection. Once a virtual table has been** added to the Schema structure and the Schema.db variable populated, ** only that database connection may use the Schema to prepare ** statements.*/struct Schema { int schema_cookie; /* Database schema version number for this file */ Hash tblHash; /* All tables indexed by name */ Hash idxHash; /* All (named) indices indexed by name */ Hash trigHash; /* All triggers indexed by name */ Hash aFKey; /* Foreign keys indexed by to-table */ Table *pSeqTab; /* The sqlite_sequence table used by AUTOINCREMENT */ u8 file_format; /* Schema format version for this file */ u8 enc; /* Text encoding used by this database */ u16 flags; /* Flags associated with this schema */ int cache_size; /* Number of pages to use in the cache */#ifndef SQLITE_OMIT_VIRTUALTABLE sqlite3 *db; /* "Owner" connection. See comment above */#endif};/*** These macros can be used to test, set, or clear bits in the ** Db.flags field.*/#define DbHasProperty(D,I,P) (((D)->aDb[I].pSchema->flags&(P))==(P))#define DbHasAnyProperty(D,I,P) (((D)->aDb[I].pSchema->flags&(P))!=0)#define DbSetProperty(D,I,P) (D)->aDb[I].pSchema->flags|=(P)#define DbClearProperty(D,I,P) (D)->aDb[I].pSchema->flags&=~(P)/*** Allowed values for the DB.flags field.**** The DB_SchemaLoaded flag is set after the database schema has been** read into internal hash tables.**** DB_UnresetViews means that one or more views have column names that** have been filled out. If the schema changes, these column names might** changes and so the view will need to be reset.*/#define DB_SchemaLoaded 0x0001 /* The schema has been loaded */#define DB_UnresetViews 0x0002 /* Some views have defined column names */#define DB_Empty 0x0004 /* The file is empty (length 0 bytes) *//*** The number of different kinds of things that can be limited** using the sqlite3_limit() interface.*/#define SQLITE_N_LIMIT (SQLITE_LIMIT_VARIABLE_NUMBER+1)/*** Lookaside malloc is a set of fixed-size buffers that can be used** to satisify small transient memory allocation requests for objects** associated with a particular database connection. The use of** lookaside malloc provides a significant performance enhancement** (approx 10%) by avoiding numerous malloc/free requests while parsing** SQL statements.**** The Lookaside structure holds configuration information about the** lookaside malloc subsystem. Each available memory allocation in** the lookaside subsystem is stored on a linked list of LookasideSlot** objects.*/struct Lookaside { u16 sz; /* Size of each buffer in bytes */ u8 bEnabled; /* True if use lookaside. False to ignore it */ u8 bMalloced; /* True if pStart obtained from sqlite3_malloc() */ int nOut; /* Number of buffers currently checked out */ int mxOut; /* Highwater mark for nOut */ LookasideSlot *pFree; /* List if available buffers */ void *pStart; /* First byte of available memory space */ void *pEnd; /* First byte past end of available space */};struct LookasideSlot { LookasideSlot *pNext; /* Next buffer in the list of free buffers */};/*** Each database is an instance of the following structure.**** The sqlite.lastRowid records the last insert rowid generated by an** insert statement. Inserts on views do not affect its value. Each** trigger has its own context, so that lastRowid can be updated inside** triggers as usual. The previous value will be restored once the trigger** exits. Upon entering a before or instead of trigger, lastRowid is no** longer (since after version 2.8.12) reset to -1.**** The sqlite.nChange does not count changes within triggers and keeps no** context. It is reset at start of sqlite3_exec.** The sqlite.lsChange represents the number of changes made by the last** insert, update, or delete statement. It remains constant throughout the** length of a statement and is then updated by OP_SetCounts. It keeps a** context stack just like lastRowid so that the count of changes** within a trigger is not seen outside the trigger. Changes to views do not** affect the value of lsChange.** The sqlite.csChange keeps track of the number of current changes (since** the last statement) and is used to update sqlite_lsChange.**** The member variables sqlite.errCode, sqlite.zErrMsg and sqlite.zErrMsg16** store the most recent error code and, if applicable, string. The** internal function sqlite3Error() is used to set these variables** consistently.*/struct sqlite3 { sqlite3_vfs *pVfs; /* OS Interface */ int nDb; /* Number of backends currently in use */ Db *aDb; /* All backends */ int flags; /* Miscellanous flags. See below */ int openFlags; /* Flags passed to sqlite3_vfs.xOpen() */ int errCode; /* Most recent error code (SQLITE_*) */ int errMask; /* & result codes with this before returning */ u8 autoCommit; /* The auto-commit flag. */ u8 temp_store; /* 1: file 2: memory 0: default */ u8 mallocFailed; /* True if we have seen a malloc failure */ u8 dfltLockMode; /* Default locking-mode for attached dbs */ u8 dfltJournalMode; /* Default journal mode for attached dbs */ signed char nextAutovac; /* Autovac setting after VACUUM if >=0 */ int nextPagesize; /* Pagesize after VACUUM if >0 */ int nTable; /* Number of tables in the database */ CollSeq *pDfltColl; /* The default collating sequence (BINARY) */ i64 lastRowid; /* ROWID of most recent insert (see above) */ i64 priorNewRowid; /* Last randomly generated ROWID */ int magic; /* Magic number for detect library misuse */ int nChange; /* Value returned by sqlite3_changes() */ int nTotalChange; /* Value returned by sqlite3_total_changes() */ sqlite3_mutex *mutex; /* Connection mutex */ int aLimit[SQLITE_N_LIMIT]; /* Limits */ struct sqlite3InitInfo { /* Information used during initialization */ int iDb; /* When back is being initialized */ int newTnum; /* Rootpage of table being initialized */ u8 busy; /* TRUE if currently initializing */ } init; int nExtension; /* Number of loaded extensions */ void **aExtension; /* Array of shared libraray handles */ struct Vdbe *pVdbe; /* List of active virtual machines */ int activeVdbeCnt; /* Number of vdbes currently executing */ void (*xTrace)(void*,const char*); /* Trace function */ void *pTraceArg; /* Argument to the trace function */ void (*xProfile)(void*,const char*,u64); /* Profiling function */ void *pProfileArg; /* Argument to profile function */ void *pCommitArg; /* Argument to xCommitCallback() */ int (*xCommitCallback)(void*); /* Invoked at every commit. */ void *pRollbackArg; /* Argument to xRollbackCallback() */ void (*xRollbackCallback)(void*); /* Invoked at every commit. */ void *pUpdateArg; void (*xUpdateCallback)(void*,int, const char*,const char*,sqlite_int64); void(*xCollNeeded)(void*,sqlite3*,int eTextRep,const char*); void(*xCollNeeded16)(void*,sqlite3*,int eTextRep,const void*); void *pCollNeededArg; sqlite3_value *pErr; /* Most recent error message */ char *zErrMsg; /* Most recent error message (UTF-8 encoded) */ char *zErrMsg16; /* Most recent error message (UTF-16 encoded) */ union { int isInterrupted; /* True if sqlite3_interrupt has been called */ double notUsed1; /* Spacer */ } u1; Lookaside lookaside; /* Lookaside malloc configuration */#ifndef SQLITE_OMIT_AUTHORIZATION int (*xAuth)(void*,int,const char*,const char*,const char*,const char*); /* Access authorization function */ void *pAuthArg; /* 1st argument to the access auth function */#endif#ifndef SQLITE_OMIT_PROGRESS_CALLBACK int (*xProgress)(void *); /* The progress callback */ void *pProgressArg; /* Argument to the progress callback */ int nProgressOps; /* Number of opcodes for progress callback */#endif#ifndef SQLITE_OMIT_VIRTUALTABLE Hash aModule; /* populated by sqlite3_create_module() */ Table *pVTab; /* vtab with active Connect/Create method */ sqlite3_vtab **aVTrans; /* Virtual tables with open transactions */ int nVTrans; /* Allocated size of aVTrans */#endif Hash aFunc; /* All functions that can be in SQL exprs */ Hash aCollSeq; /* All collating sequences */ BusyHandler busyHandler; /* Busy callback */ int busyTimeout; /* Busy handler timeout, in msec */ Db aDbStatic[2]; /* Static space for the 2 default backends */#ifdef SQLITE_SSE sqlite3_stmt *pFetch; /* Used by SSE to fetch stored statements */#endif};/*** A macro to discover the encoding of a database.*/#define ENC(db) ((db)->aDb[0].pSchema->enc)/*** Possible values for the sqlite.flags and or Db.flags fields.**** On sqlite.flags, the SQLITE_InTrans value means that we have** executed a BEGIN. On Db.flags, SQLITE_InTrans means a statement** transaction is active on that particular database file.*/#define SQLITE_VdbeTrace 0x00000001 /* True to trace VDBE execution */#define SQLITE_InTrans 0x00000008 /* True if in a transaction */#define SQLITE_InternChanges 0x00000010 /* Uncommitted Hash table changes */#define SQLITE_FullColNames 0x00000020 /* Show full column names on SELECT */#define SQLITE_ShortColNames 0x00000040 /* Show short columns names */#define SQLITE_CountRows 0x00000080 /* Count rows changed by INSERT, */ /* DELETE, or UPDATE and return */ /* the count using a callback. */#define SQLITE_NullCallback 0x00000100 /* Invoke the callback once if the */ /* result set is empty */#define SQLITE_SqlTrace 0x00000200 /* Debug print SQL as it executes */#define SQLITE_VdbeListing 0x00000400 /* Debug listings of VDBE programs */#define SQLITE_WriteSchema 0x00000800 /* OK to update SQLITE_MASTER */#define SQLITE_NoReadlock 0x00001000 /* Readlocks are omitted when ** accessing read-only databases */#define SQLITE_IgnoreChecks 0x00002000 /* Do not enforce check constraints */#define SQLITE_ReadUncommitted 0x00004000 /* For shared-cache mode */#define SQLITE_LegacyFileFmt 0x00008000 /* Create new databases in format 1 */#define SQLITE_FullFSync 0x00010000 /* Use full fsync on the backend */#define SQLITE_LoadExtension 0x00020000 /* Enable load_extension */#define SQLITE_RecoveryMode 0x00040000 /* Ignore schema errors */#define SQLITE_SharedCache 0x00080000 /* Cache sharing is enabled */#define SQLITE_Vtab 0x00100000 /* There exists a virtual table *//*** Possible values for the sqlite.magic field.** The numbers are obtained at random and have no special meaning, other** than being distinct from one another.*/#define SQLITE_MAGIC_OPEN 0xa029a697 /* Database is open */#define SQLITE_MAGIC_CLOSED 0x9f3c2d33 /* Database is closed */#define SQLITE_MAGIC_SICK 0x4b771290 /* Error and awaiting close */#define SQLITE_MAGIC_BUSY 0xf03b7906 /* Database currently in use */#define SQLITE_MAGIC_ERROR 0xb5357930 /* An SQLITE_MISUSE error occurred *//*** Each SQL function is defined by an instance of the following** structure. A pointer to this structure is stored in the sqlite.aFunc** hash table. When multiple functions have the same name, the hash table** points to a linked list of these structures.*/struct FuncDef { i16 nArg; /* Number of arguments. -1 means unlimited */ u8 iPrefEnc; /* Preferred text encoding (SQLITE_UTF8, 16LE, 16BE) */ u8 needCollSeq; /* True if sqlite3GetFuncCollSeq() might be called */ u8 flags; /* Some combination of SQLITE_FUNC_* */ void *pUserData; /* User data parameter */ FuncDef *pNext; /* Next function with same name */ void (*xFunc)(sqlite3_context*,int,sqlite3_value**); /* Regular function */ void (*xStep)(sqlite3_context*,int,sqlite3_value**); /* Aggregate step */ void (*xFinalize)(sqlite3_context*); /* Aggregate finializer */ char zName[1]; /* SQL name of the function. MUST BE LAST */};/*** Each SQLite module (virtual table definition) is defined by an** instance of the following structure, stored in the sqlite3.aModule** hash table.*/struct Module { const sqlite3_module *pModule; /* Callback pointers */ const char *zName; /* Name passed to create_module() */ void *pAux; /* pAux passed to create_module() */ void (*xDestroy)(void *); /* Module destructor function */};/*** Possible values for FuncDef.flags*/#define SQLITE_FUNC_LIKE 0x01 /* Candidate for the LIKE optimization */#define SQLITE_FUNC_CASE 0x02 /* Case-sensitive LIKE-type function */#define SQLITE_FUNC_EPHEM 0x04 /* Ephermeral. Delete with VDBE *//*** information about each column of an SQL table is held in an instance** of this structure.*/struct Column { char *zName; /* Name of this column */ Expr *pDflt; /* Default value of this column */ char *zType; /* Data type for this column */ char *zColl; /* Collating sequence. If NULL, use the default */ u8 notNull; /* True if there is a NOT NULL constraint */ u8 isPrimKey; /* True if this column is part of the PRIMARY KEY */ char affinity; /* One of the SQLITE_AFF_... values */#ifndef SQLITE_OMIT_VIRTUALTABLE u8 isHidden; /* True if this column is 'hidden' */#endif};/*** A "Collating Sequence" is defined by an instance of the following** structure. Conceptually, a collating sequence consists of a name and** a comparison routine that defines the order of that sequence.**** There may two seperate implementations of the collation function, one** that processes text in UTF-8 encoding (CollSeq.xCmp) and another that** processes text encoded in UTF-16 (CollSeq.xCmp16), using the machine** native byte order. When a collation sequence is invoked, SQLite selects** the version that will require the least expensive encoding** translations, if any.**** The CollSeq.pUser member variable is an extra parameter that passed in** as the first argument to the UTF-8 comparison function, xCmp.** CollSeq.pUser16 is the equivalent for the UTF-16 comparison function,** xCmp16.**** If both CollSeq.xCmp and CollSeq.xCmp16 are NULL, it means that the** collating sequence is undefined. Indices built on an undefined** collating sequence may not be read or written.*/struct CollSeq { char *zName; /* Name of the collating sequence, UTF-8 encoded */ u8 enc; /* Text encoding handled by xCmp() */ u8 type; /* One of the SQLITE_COLL_... values below */ void *pUser; /* First argument to xCmp() */ int (*xCmp)(void*,int, const void*, int, const void*); void (*xDel)(void*); /* Destructor for pUser */};/*** Allowed values of CollSeq flags:*/#define SQLITE_COLL_BINARY 1 /* The default memcmp() collating sequence */#define SQLITE_COLL_NOCASE 2 /* The built-in NOCASE collating sequence */#define SQLITE_COLL_REVERSE 3 /* The built-in REVERSE collating sequence */#define SQLITE_COLL_USER 0 /* Any other user-defined collating sequence *//*** A sort order can be either ASC or DESC.*/#define SQLITE_SO_ASC 0 /* Sort in ascending order */#define SQLITE_SO_DESC 1 /* Sort in ascending order *//*** Column affinity types.**** These used to have mnemonic name like 'i' for SQLITE_AFF_INTEGER and** 't' for SQLITE_AFF_TEXT. But we can save a little space and improve** the speed a little by number the values consecutively. **** But rather than start with 0 or 1, we begin with 'a'. That way,** when multiple affinity types are concatenated into a string and** used as the P4 operand, they will be more readable.**** Note also that the numeric types are grouped together so that testing** for a numeric type is a single comparison.*/#define SQLITE_AFF_TEXT 'a'#define SQLITE_AFF_NONE 'b'#define SQLITE_AFF_NUMERIC 'c'#define SQLITE_AFF_INTEGER 'd'#define SQLITE_AFF_REAL 'e'#define sqlite3IsNumericAffinity(X) ((X)>=SQLITE_AFF_NUMERIC)/*** The SQLITE_AFF_MASK values masks off the significant bits of an** affinity value. */#define SQLITE_AFF_MASK 0x67/*** Additional bit values that can be ORed with an affinity without** changing the affinity.*/#define SQLITE_JUMPIFNULL 0x08 /* jumps if either operand is NULL */#define SQLITE_STOREP2 0x10 /* Store result in reg[P2] rather than jump *//*** Each SQL table is represented in memory by an instance of the** following structure.**** Table.zName is the name of the table. The case of the original** CREATE TABLE statement is stored, but case is not significant for** comparisons.**** Table.nCol is the number of columns in this table. Table.aCol is a** pointer to an array of Column structures, one for each column.**** If the table has an INTEGER PRIMARY KEY, then Table.iPKey is the index of** the column that is that key. Otherwise Table.iPKey is negative. Note** that the datatype of the PRIMARY KEY must be INTEGER for this field to** be set. An INTEGER PRIMARY KEY is used as the rowid for each row of** the table. If a table has no INTEGER PRIMARY KEY, then a random rowid** is generated for each row of the table. Table.hasPrimKey is true if** the table has any PRIMARY KEY, INTEGER or otherwise.**** Table.tnum is the page number for the root BTree page of the table in the** database file. If Table.iDb is the index of the database table backend** in sqlite.aDb[]. 0 is for the main database and 1 is for the file that** holds temporary tables and indices. If Table.isEphem** is true, then the table is stored in a file that is automatically deleted** when the VDBE cursor to the table is closed. In this case Table.tnum ** refers VDBE cursor number that holds the table open, not to the root** page number. Transient tables are used to hold the results of a** sub-query that appears instead of a real table name in the FROM clause ** of a SELECT statement.*/struct Table { sqlite3 *db; /* Associated database connection. Might be NULL. */ char *zName; /* Name of the table */ int nCol; /* Number of columns in this table */ Column *aCol; /* Information about each column */ int iPKey; /* If not less then 0, use aCol[iPKey] as the primary key */ Index *pIndex; /* List of SQL indexes on this table. */ int tnum; /* Root BTree node for this table (see note above) */ Select *pSelect; /* NULL for tables. Points to definition if a view. */ int nRef; /* Number of pointers to this Table */ Trigger *pTrigger; /* List of SQL triggers on this table */ FKey *pFKey; /* Linked list of all foreign keys in this table */ char *zColAff; /* String defining the affinity of each column */#ifndef SQLITE_OMIT_CHECK Expr *pCheck; /* The AND of all CHECK constraints */#endif#ifndef SQLITE_OMIT_ALTERTABLE int addColOffset; /* Offset in CREATE TABLE statement to add a new column */#endif u8 readOnly; /* True if this table should not be written by the user */ u8 isEphem; /* True if created using OP_OpenEphermeral */ u8 hasPrimKey; /* True if there exists a primary key */ u8 keyConf; /* What to do in case of uniqueness conflict on iPKey */ u8 autoInc; /* True if the integer primary key is autoincrement */#ifndef SQLITE_OMIT_VIRTUALTABLE u8 isVirtual; /* True if this is a virtual table */ u8 isCommit; /* True once the CREATE TABLE has been committed */ Module *pMod; /* Pointer to the implementation of the module */ sqlite3_vtab *pVtab; /* Pointer to the module instance */ int nModuleArg; /* Number of arguments to the module */ char **azModuleArg; /* Text of all module args. [0] is module name */#endif Schema *pSchema; /* Schema that contains this table */};/*** Test to see whether or not a table is a virtual table. This is** done as a macro so that it will be optimized out when virtual** table support is omitted from the build.*/#ifndef SQLITE_OMIT_VIRTUALTABLE# define IsVirtual(X) ((X)->isVirtual)# define IsHiddenColumn(X) ((X)->isHidden)#else# define IsVirtual(X) 0# define IsHiddenColumn(X) 0#endif/*** Each foreign key constraint is an instance of the following structure.**** A foreign key is associated with two tables. The "from" table is** the table that contains the REFERENCES clause that creates the foreign** key. The "to" table is the table that is named in the REFERENCES clause.** Consider this example:**** CREATE TABLE ex1(** a INTEGER PRIMARY KEY,** b INTEGER CONSTRAINT fk1 REFERENCES ex2(x)** );**** For foreign key "fk1", the from-table is "ex1" and the to-table is "ex2".**** Each REFERENCES clause generates an instance of the following structure** which is attached to the from-table. The to-table need not exist when** the from-table is created. The existance of the to-table is not checked** until an attempt is made to insert data into the from-table.**** The sqlite.aFKey hash table stores pointers to this structure** given the name of a to-table. For each to-table, all foreign keys** associated with that table are on a linked list using the FKey.pNextTo** field.*/struct FKey { Table *pFrom; /* The table that constains the REFERENCES clause */ FKey *pNextFrom; /* Next foreign key in pFrom */ char *zTo; /* Name of table that the key points to */ FKey *pNextTo; /* Next foreign key that points to zTo */ int nCol; /* Number of columns in this key */ struct sColMap { /* Mapping of columns in pFrom to columns in zTo */ int iFrom; /* Index of column in pFrom */ char *zCol; /* Name of column in zTo. If 0 use PRIMARY KEY */ } *aCol; /* One entry for each of nCol column s */ u8 isDeferred; /* True if constraint checking is deferred till COMMIT */ u8 updateConf; /* How to resolve conflicts that occur on UPDATE */ u8 deleteConf; /* How to resolve conflicts that occur on DELETE */ u8 insertConf; /* How to resolve conflicts that occur on INSERT */};/*** SQLite supports many different ways to resolve a constraint** error. ROLLBACK processing means that a constraint violation** causes the operation in process to fail and for the current transaction** to be rolled back. ABORT processing means the operation in process** fails and any prior changes from that one operation are backed out,** but the transaction is not rolled back. FAIL processing means that** the operation in progress stops and returns an error code. But prior** changes due to the same operation are not backed out and no rollback** occurs. IGNORE means that the particular row that caused the constraint** error is not inserted or updated. Processing continues and no error** is returned. REPLACE means that preexisting database rows that caused** a UNIQUE constraint violation are removed so that the new insert or** update can proceed. Processing continues and no error is reported.**** RESTRICT, SETNULL, and CASCADE actions apply only to foreign keys.** RESTRICT is the same as ABORT for IMMEDIATE foreign keys and the** same as ROLLBACK for DEFERRED keys. SETNULL means that the foreign** key is set to NULL. CASCADE means that a DELETE or UPDATE of the** referenced table row is propagated into the row that holds the** foreign key.** ** The following symbolic values are used to record which type** of action to take.*/#define OE_None 0 /* There is no constraint to check */#define OE_Rollback 1 /* Fail the operation and rollback the transaction */#define OE_Abort 2 /* Back out changes but do no rollback transaction */#define OE_Fail 3 /* Stop the operation but leave all prior changes */#define OE_Ignore 4 /* Ignore the error. Do not do the INSERT or UPDATE */#define OE_Replace 5 /* Delete existing record, then do INSERT or UPDATE */#define OE_Restrict 6 /* OE_Abort for IMMEDIATE, OE_Rollback for DEFERRED */#define OE_SetNull 7 /* Set the foreign key value to NULL */#define OE_SetDflt 8 /* Set the foreign key value to its default */#define OE_Cascade 9 /* Cascade the changes */#define OE_Default 99 /* Do whatever the default action is *//*** An instance of the following structure is passed as the first** argument to sqlite3VdbeKeyCompare and is used to control the ** comparison of the two index keys.**** If the KeyInfo.incrKey value is true and the comparison would** otherwise be equal, then return a result as if the second key** were larger.*/struct KeyInfo { sqlite3 *db; /* The database connection */ u8 enc; /* Text encoding - one of the TEXT_Utf* values */ u8 incrKey; /* Increase 2nd key by epsilon before comparison */ u8 prefixIsEqual; /* Treat a prefix as equal */ int nField; /* Number of entries in aColl[] */ u8 *aSortOrder; /* If defined an aSortOrder[i] is true, sort DESC */ CollSeq *aColl[1]; /* Collating sequence for each term of the key */};/*** Each SQL index is represented in memory by an** instance of the following structure.**** The columns of the table that are to be indexed are described** by the aiColumn[] field of this structure. For example, suppose** we have the following table and index:**** CREATE TABLE Ex1(c1 int, c2 int, c3 text);** CREATE INDEX Ex2 ON Ex1(c3,c1);**** In the Table structure describing Ex1, nCol==3 because there are** three columns in the table. In the Index structure describing** Ex2, nColumn==2 since 2 of the 3 columns of Ex1 are indexed.** The value of aiColumn is {2, 0}. aiColumn[0]==2 because the ** first column to be indexed (c3) has an index of 2 in Ex1.aCol[].** The second column to be indexed (c1) has an index of 0 in** Ex1.aCol[], hence Ex2.aiColumn[1]==0.**** The Index.onError field determines whether or not the indexed columns** must be unique and what to do if they are not. When Index.onError=OE_None,** it means this is not a unique index. Otherwise it is a unique index** and the value of Index.onError indicate the which conflict resolution ** algorithm to employ whenever an attempt is made to insert a non-unique** element.*/struct Index { char *zName; /* Name of this index */ int nColumn; /* Number of columns in the table used by this index */ int *aiColumn; /* Which columns are used by this index. 1st is 0 */ unsigned *aiRowEst; /* Result of ANALYZE: Est. rows selected by each column */ Table *pTable; /* The SQL table being indexed */ int tnum; /* Page containing root of this index in database file */ u8 onError; /* OE_Abort, OE_Ignore, OE_Replace, or OE_None */ u8 autoIndex; /* True if is automatically created (ex: by UNIQUE) */ char *zColAff; /* String defining the affinity of each column */ Index *pNext; /* The next index associated with the same table */ Schema *pSchema; /* Schema containing this index */ u8 *aSortOrder; /* Array of size Index.nColumn. True==DESC, False==ASC */ char **azColl; /* Array of collation sequence names for index */};/*** Each token coming out of the lexer is an instance of** this structure. Tokens are also used as part of an expression.**** Note if Token.z==0 then Token.dyn and Token.n are undefined and** may contain random values. Do not make any assuptions about Token.dyn** and Token.n when Token.z==0.*/struct Token { const unsigned char *z; /* Text of the token. Not NULL-terminated! */ unsigned dyn : 1; /* True for malloced memory, false for static */ unsigned n : 31; /* Number of characters in this token */};/*** An instance of this structure contains information needed to generate** code for a SELECT that contains aggregate functions.**** If Expr.op==TK_AGG_COLUMN or TK_AGG_FUNCTION then Expr.pAggInfo is a** pointer to this structure. The Expr.iColumn field is the index in** AggInfo.aCol[] or AggInfo.aFunc[] of information needed to generate** code for that node.**** AggInfo.pGroupBy and AggInfo.aFunc.pExpr point to fields within the** original Select structure that describes the SELECT statement. These** fields do not need to be freed when deallocating the AggInfo structure.*/struct AggInfo { u8 directMode; /* Direct rendering mode means take data directly ** from source tables rather than from accumulators */ u8 useSortingIdx; /* In direct mode, reference the sorting index rather ** than the source table */ int sortingIdx; /* Cursor number of the sorting index */ ExprList *pGroupBy; /* The group by clause */ int nSortingColumn; /* Number of columns in the sorting index */ struct AggInfo_col { /* For each column used in source tables */ Table *pTab; /* Source table */ int iTable; /* Cursor number of the source table */ int iColumn; /* Column number within the source table */ int iSorterColumn; /* Column number in the sorting index */ int iMem; /* Memory location that acts as accumulator */ Expr *pExpr; /* The original expression */ } *aCol; int nColumn; /* Number of used entries in aCol[] */ int nColumnAlloc; /* Number of slots allocated for aCol[] */ int nAccumulator; /* Number of columns that show through to the output. ** Additional columns are used only as parameters to ** aggregate functions */ struct AggInfo_func { /* For each aggregate function */ Expr *pExpr; /* Expression encoding the function */ FuncDef *pFunc; /* The aggregate function implementation */ int iMem; /* Memory location that acts as accumulator */ int iDistinct; /* Ephermeral table used to enforce DISTINCT */ } *aFunc; int nFunc; /* Number of entries in aFunc[] */ int nFuncAlloc; /* Number of slots allocated for aFunc[] */};/*** Each node of an expression in the parse tree is an instance** of this structure.**** Expr.op is the opcode. The integer parser token codes are reused** as opcodes here. For example, the parser defines TK_GE to be an integer** code representing the ">=" operator. This same integer code is reused** to represent the greater-than-or-equal-to operator in the expression** tree.**** Expr.pRight and Expr.pLeft are subexpressions. Expr.pList is a list** of argument if the expression is a function.**** Expr.token is the operator token for this node. For some expressions** that have subexpressions, Expr.token can be the complete text that gave** rise to the Expr. In the latter case, the token is marked as being** a compound token.**** An expression of the form ID or ID.ID refers to a column in a table.** For such expressions, Expr.op is set to TK_COLUMN and Expr.iTable is** the integer cursor number of a VDBE cursor pointing to that table and** Expr.iColumn is the column number for the specific column. If the** expression is used as a result in an aggregate SELECT, then the** value is also stored in the Expr.iAgg column in the aggregate so that** it can be accessed after all aggregates are computed.**** If the expression is a function, the Expr.iTable is an integer code** representing which function. If the expression is an unbound variable** marker (a question mark character '?' in the original SQL) then the** Expr.iTable holds the index number for that variable.**** If the expression is a subquery then Expr.iColumn holds an integer** register number containing the result of the subquery. If the** subquery gives a constant result, then iTable is -1. If the subquery** gives a different answer at different times during statement processing** then iTable is the address of a subroutine that computes the subquery.**** The Expr.pSelect field points to a SELECT statement. The SELECT might** be the right operand of an IN operator. Or, if a scalar SELECT appears** in an expression the opcode is TK_SELECT and Expr.pSelect is the only** operand.**** If the Expr is of type OP_Column, and the table it is selecting from** is a disk table or the "old.*" pseudo-table, then pTab points to the** corresponding table definition.*/struct Expr { u8 op; /* Operation performed by this node */ char affinity; /* The affinity of the column or 0 if not a column */ u16 flags; /* Various flags. See below */ CollSeq *pColl; /* The collation type of the column or 0 */ Expr *pLeft, *pRight; /* Left and right subnodes */ ExprList *pList; /* A list of expressions used as function arguments ** or in "<expr> IN (<expr-list)" */ Token token; /* An operand token */ Token span; /* Complete text of the expression */ int iTable, iColumn; /* When op==TK_COLUMN, then this expr node means the ** iColumn-th field of the iTable-th table. */ AggInfo *pAggInfo; /* Used by TK_AGG_COLUMN and TK_AGG_FUNCTION */ int iAgg; /* Which entry in pAggInfo->aCol[] or ->aFunc[] */ int iRightJoinTable; /* If EP_FromJoin, the right table of the join */ Select *pSelect; /* When the expression is a sub-select. Also the ** right side of "<expr> IN (<select>)" */ Table *pTab; /* Table for OP_Column expressions. */#if SQLITE_MAX_EXPR_DEPTH>0 int nHeight; /* Height of the tree headed by this node */#endif};/*** The following are the meanings of bits in the Expr.flags field.*/#define EP_FromJoin 0x0001 /* Originated in ON or USING clause of a join */#define EP_Agg 0x0002 /* Contains one or more aggregate functions */#define EP_Resolved 0x0004 /* IDs have been resolved to COLUMNs */#define EP_Error 0x0008 /* Expression contains one or more errors */#define EP_Distinct 0x0010 /* Aggregate function with DISTINCT keyword */#define EP_VarSelect 0x0020 /* pSelect is correlated, not constant */#define EP_Dequoted 0x0040 /* True if the string has been dequoted */#define EP_InfixFunc 0x0080 /* True for an infix function: LIKE, GLOB, etc */#define EP_ExpCollate 0x0100 /* Collating sequence specified explicitly */#define EP_AnyAff 0x0200 /* Can take a cached column of any affinity */#define EP_FixedDest 0x0400 /* Result needed in a specific register */#define EP_IntValue 0x0800 /* Integer value contained in iTable *//*** These macros can be used to test, set, or clear bits in the ** Expr.flags field.*/#define ExprHasProperty(E,P) (((E)->flags&(P))==(P))#define ExprHasAnyProperty(E,P) (((E)->flags&(P))!=0)#define ExprSetProperty(E,P) (E)->flags|=(P)#define ExprClearProperty(E,P) (E)->flags&=~(P)/*** A list of expressions. Each expression may optionally have a** name. An expr/name combination can be used in several ways, such** as the list of "expr AS ID" fields following a "SELECT" or in the** list of "ID = expr" items in an UPDATE. A list of expressions can** also be used as the argument to a function, in which case the a.zName** field is not used.*/struct ExprList { int nExpr; /* Number of expressions on the list */ int nAlloc; /* Number of entries allocated below */ int iECursor; /* VDBE Cursor associated with this ExprList */ struct ExprList_item { Expr *pExpr; /* The list of expressions */ char *zName; /* Token associated with this expression */ u8 sortOrder; /* 1 for DESC or 0 for ASC */ u8 isAgg; /* True if this is an aggregate like count(*) */ u8 done; /* A flag to indicate when processing is finished */ } *a; /* One entry for each expression */};/*** An instance of this structure can hold a simple list of identifiers,** such as the list "a,b,c" in the following statements:**** INSERT INTO t(a,b,c) VALUES ...;** CREATE INDEX idx ON t(a,b,c);** CREATE TRIGGER trig BEFORE UPDATE ON t(a,b,c) ...;**** The IdList.a.idx field is used when the IdList represents the list of** column names after a table name in an INSERT statement. In the statement**** INSERT INTO t(a,b,c) ...**** If "a" is the k-th column of table "t", then IdList.a[0].idx==k.*/struct IdList { struct IdList_item { char *zName; /* Name of the identifier */ int idx; /* Index in some Table.aCol[] of a column named zName */ } *a; int nId; /* Number of identifiers on the list */ int nAlloc; /* Number of entries allocated for a[] below */};/*** The bitmask datatype defined below is used for various optimizations.**** Changing this from a 64-bit to a 32-bit type limits the number of** tables in a join to 32 instead of 64. But it also reduces the size** of the library by 738 bytes on ix86.*/typedef u64 Bitmask;/*** The following structure describes the FROM clause of a SELECT statement.** Each table or subquery in the FROM clause is a separate element of** the SrcList.a[] array.**** With the addition of multiple database support, the following structure** can also be used to describe a particular table such as the table that** is modified by an INSERT, DELETE, or UPDATE statement. In standard SQL,** such a table must be a simple name: ID. But in SQLite, the table can** now be identified by a database name, a dot, then the table name: ID.ID.**** The jointype starts out showing the join type between the current table** and the next table on the list. The parser builds the list this way.** But sqlite3SrcListShiftJoinType() later shifts the jointypes so that each** jointype expresses the join between the table and the previous table.*/struct SrcList { i16 nSrc; /* Number of tables or subqueries in the FROM clause */ i16 nAlloc; /* Number of entries allocated in a[] below */ struct SrcList_item { char *zDatabase; /* Name of database holding this table */ char *zName; /* Name of the table */ char *zAlias; /* The "B" part of a "A AS B" phrase. zName is the "A" */ Table *pTab; /* An SQL table corresponding to zName */ Select *pSelect; /* A SELECT statement used in place of a table name */ u8 isPopulated; /* Temporary table associated with SELECT is populated */ u8 jointype; /* Type of join between this able and the previous */ int iCursor; /* The VDBE cursor number used to access this table */ Expr *pOn; /* The ON clause of a join */ IdList *pUsing; /* The USING clause of a join */ Bitmask colUsed; /* Bit N (1<<N) set if column N or pTab is used */ } a[1]; /* One entry for each identifier on the list */};/*** Permitted values of the SrcList.a.jointype field*/#define JT_INNER 0x0001 /* Any kind of inner or cross join */#define JT_CROSS 0x0002 /* Explicit use of the CROSS keyword */#define JT_NATURAL 0x0004 /* True for a "natural" join */#define JT_LEFT 0x0008 /* Left outer join */#define JT_RIGHT 0x0010 /* Right outer join */#define JT_OUTER 0x0020 /* The "OUTER" keyword is present */#define JT_ERROR 0x0040 /* unknown or unsupported join type *//*** For each nested loop in a WHERE clause implementation, the WhereInfo** structure contains a single instance of this structure. This structure** is intended to be private the the where.c module and should not be** access or modified by other modules.**** The pIdxInfo and pBestIdx fields are used to help pick the best** index on a virtual table. The pIdxInfo pointer contains indexing** information for the i-th table in the FROM clause before reordering.** All the pIdxInfo pointers are freed by whereInfoFree() in where.c.** The pBestIdx pointer is a copy of pIdxInfo for the i-th table after** FROM clause ordering. This is a little confusing so I will repeat** it in different words. WhereInfo.a[i].pIdxInfo is index information ** for WhereInfo.pTabList.a[i]. WhereInfo.a[i].pBestInfo is the** index information for the i-th loop of the join. pBestInfo is always** either NULL or a copy of some pIdxInfo. So for cleanup it is ** sufficient to free all of the pIdxInfo pointers.** */struct WhereLevel { int iFrom; /* Which entry in the FROM clause */ int flags; /* Flags associated with this level */ int iMem; /* First memory cell used by this level */ int iLeftJoin; /* Memory cell used to implement LEFT OUTER JOIN */ Index *pIdx; /* Index used. NULL if no index */ int iTabCur; /* The VDBE cursor used to access the table */ int iIdxCur; /* The VDBE cursor used to acesss pIdx */ int brk; /* Jump here to break out of the loop */ int nxt; /* Jump here to start the next IN combination */ int cont; /* Jump here to continue with the next loop cycle */ int top; /* First instruction of interior of the loop */ int op, p1, p2; /* Opcode used to terminate the loop */ int nEq; /* Number of == or IN constraints on this loop */ int nIn; /* Number of IN operators constraining this loop */ struct InLoop { int iCur; /* The VDBE cursor used by this IN operator */ int topAddr; /* Top of the IN loop */ } *aInLoop; /* Information about each nested IN operator */ sqlite3_index_info *pBestIdx; /* Index information for this level */ /* The following field is really not part of the current level. But ** we need a place to cache index information for each table in the ** FROM clause and the WhereLevel structure is a convenient place. */ sqlite3_index_info *pIdxInfo; /* Index info for n-th source table */};/*** Flags appropriate for the wflags parameter of sqlite3WhereBegin().*/#define WHERE_ORDERBY_NORMAL 0 /* No-op */#define WHERE_ORDERBY_MIN 1 /* ORDER BY processing for min() func */#define WHERE_ORDERBY_MAX 2 /* ORDER BY processing for max() func */#define WHERE_ONEPASS_DESIRED 4 /* Want to do one-pass UPDATE/DELETE *//*** The WHERE clause processing routine has two halves. The** first part does the start of the WHERE loop and the second** half does the tail of the WHERE loop. An instance of** this structure is returned by the first half and passed** into the second half to give some continuity.*/struct WhereInfo { Parse *pParse; /* Parsing and code generating context */ u8 okOnePass; /* Ok to use one-pass algorithm for UPDATE or DELETE */ SrcList *pTabList; /* List of tables in the join */ int iTop; /* The very beginning of the WHERE loop */ int iContinue; /* Jump here to continue with next record */ int iBreak; /* Jump here to break out of the loop */ int nLevel; /* Number of nested loop */ sqlite3_index_info **apInfo; /* Array of pointers to index info structures */ WhereLevel a[1]; /* Information about each nest loop in the WHERE */};/*** A NameContext defines a context in which to resolve table and column** names. The context consists of a list of tables (the pSrcList) field and** a list of named expression (pEList). The named expression list may** be NULL. The pSrc corresponds to the FROM clause of a SELECT or** to the table being operated on by INSERT, UPDATE, or DELETE. The** pEList corresponds to the result set of a SELECT and is NULL for** other statements.**** NameContexts can be nested. When resolving names, the inner-most ** context is searched first. If no match is found, the next outer** context is checked. If there is still no match, the next context** is checked. This process continues until either a match is found** or all contexts are check. When a match is found, the nRef member of** the context containing the match is incremented. **** Each subquery gets a new NameContext. The pNext field points to the** NameContext in the parent query. Thus the process of scanning the** NameContext list corresponds to searching through successively outer** subqueries looking for a match.*/struct NameContext { Parse *pParse; /* The parser */ SrcList *pSrcList; /* One or more tables used to resolve names */ ExprList *pEList; /* Optional list of named expressions */ int nRef; /* Number of names resolved by this context */ int nErr; /* Number of errors encountered while resolving names */ u8 allowAgg; /* Aggregate functions allowed here */ u8 hasAgg; /* True if aggregates are seen */ u8 isCheck; /* True if resolving names in a CHECK constraint */ int nDepth; /* Depth of subquery recursion. 1 for no recursion */ AggInfo *pAggInfo; /* Information about aggregates at this level */ NameContext *pNext; /* Next outer name context. NULL for outermost */};/*** An instance of the following structure contains all information** needed to generate code for a single SELECT statement.**** nLimit is set to -1 if there is no LIMIT clause. nOffset is set to 0.** If there is a LIMIT clause, the parser sets nLimit to the value of the** limit and nOffset to the value of the offset (or 0 if there is not** offset). But later on, nLimit and nOffset become the memory locations** in the VDBE that record the limit and offset counters.**** addrOpenEphm[] entries contain the address of OP_OpenEphemeral opcodes.** These addresses must be stored so that we can go back and fill in** the P4_KEYINFO and P2 parameters later. Neither the KeyInfo nor** the number of columns in P2 can be computed at the same time** as the OP_OpenEphm instruction is coded because not** enough information about the compound query is known at that point.** The KeyInfo for addrOpenTran[0] and [1] contains collating sequences** for the result set. The KeyInfo for addrOpenTran[2] contains collating** sequences for the ORDER BY clause.*/struct Select { ExprList *pEList; /* The fields of the result */ u8 op; /* One of: TK_UNION TK_ALL TK_INTERSECT TK_EXCEPT */ u8 isDistinct; /* True if the DISTINCT keyword is present */ u8 isResolved; /* True once sqlite3SelectResolve() has run. */ u8 isAgg; /* True if this is an aggregate query */ u8 usesEphm; /* True if uses an OpenEphemeral opcode */ u8 disallowOrderBy; /* Do not allow an ORDER BY to be attached if TRUE */ char affinity; /* MakeRecord with this affinity for SRT_Set */ SrcList *pSrc; /* The FROM clause */ Expr *pWhere; /* The WHERE clause */ ExprList *pGroupBy; /* The GROUP BY clause */ Expr *pHaving; /* The HAVING clause */ ExprList *pOrderBy; /* The ORDER BY clause */ Select *pPrior; /* Prior select in a compound select statement */ Select *pNext; /* Next select to the left in a compound */ Select *pRightmost; /* Right-most select in a compound select statement */ Expr *pLimit; /* LIMIT expression. NULL means not used. */ Expr *pOffset; /* OFFSET expression. NULL means not used. */ int iLimit, iOffset; /* Memory registers holding LIMIT & OFFSET counters */ int addrOpenEphm[3]; /* OP_OpenEphem opcodes related to this select */};/*** The results of a select can be distributed in several ways.*/#define SRT_Union 1 /* Store result as keys in an index */#define SRT_Except 2 /* Remove result from a UNION index */#define SRT_Exists 3 /* Store 1 if the result is not empty */#define SRT_Discard 4 /* Do not save the results anywhere *//* The ORDER BY clause is ignored for all of the above */#define IgnorableOrderby(X) ((X->eDest)<=SRT_Discard)#define SRT_Callback 5 /* Invoke a callback with each row of result */#define SRT_Mem 6 /* Store result in a memory cell */#define SRT_Set 7 /* Store results as keys in an index */#define SRT_Table 8 /* Store result as data with an automatic rowid */#define SRT_EphemTab 9 /* Create transient tab and store like SRT_Table */#define SRT_Coroutine 10 /* Generate a single row of result *//*** A structure used to customize the behaviour of sqlite3Select(). See** comments above sqlite3Select() for details.*/typedef struct SelectDest SelectDest;struct SelectDest { u8 eDest; /* How to dispose of the results */ u8 affinity; /* Affinity used when eDest==SRT_Set */ int iParm; /* A parameter used by the eDest disposal method */ int iMem; /* Base register where results are written */ int nMem; /* Number of registers allocated */};/*** An SQL parser context. A copy of this structure is passed through** the parser and down into all the parser action routine in order to** carry around information that is global to the entire parse.**** The structure is divided into two parts. When the parser and code** generate call themselves recursively, the first part of the structure** is constant but the second part is reset at the beginning and end of** each recursion.**** The nTableLock and aTableLock variables are only used if the shared-cache ** feature is enabled (if sqlite3Tsd()->useSharedData is true). They are** used to store the set of table-locks required by the statement being** compiled. Function sqlite3TableLock() is used to add entries to the** list.*/struct Parse { sqlite3 *db; /* The main database structure */ int rc; /* Return code from execution */ char *zErrMsg; /* An error message */ Vdbe *pVdbe; /* An engine for executing database bytecode */ u8 colNamesSet; /* TRUE after OP_ColumnName has been issued to pVdbe */ u8 nameClash; /* A permanent table name clashes with temp table name */ u8 checkSchema; /* Causes schema cookie check after an error */ u8 nested; /* Number of nested calls to the parser/code generator */ u8 parseError; /* True after a parsing error. Ticket #1794 */ u8 nTempReg; /* Number of temporary registers in aTempReg[] */ u8 nTempInUse; /* Number of aTempReg[] currently checked out */ int aTempReg[8]; /* Holding area for temporary registers */ int nRangeReg; /* Size of the temporary register block */ int iRangeReg; /* First register in temporary register block */ int nErr; /* Number of errors seen */ int nTab; /* Number of previously allocated VDBE cursors */ int nMem; /* Number of memory cells used so far */ int nSet; /* Number of sets used so far */ int ckBase; /* Base register of data during check constraints */ int disableColCache; /* True to disable adding to column cache */ int nColCache; /* Number of entries in the column cache */ int iColCache; /* Next entry of the cache to replace */ struct yColCache { int iTable; /* Table cursor number */ int iColumn; /* Table column number */ char affChange; /* True if this register has had an affinity change */ int iReg; /* Register holding value of this column */ } aColCache[10]; /* One for each valid column cache entry */ u32 writeMask; /* Start a write transaction on these databases */ u32 cookieMask; /* Bitmask of schema verified databases */ int cookieGoto; /* Address of OP_Goto to cookie verifier subroutine */ int cookieValue[SQLITE_MAX_ATTACHED+2]; /* Values of cookies to verify */#ifndef SQLITE_OMIT_SHARED_CACHE int nTableLock; /* Number of locks in aTableLock */ TableLock *aTableLock; /* Required table locks for shared-cache mode */#endif int regRowid; /* Register holding rowid of CREATE TABLE entry */ int regRoot; /* Register holding root page number for new objects */ /* Above is constant between recursions. Below is reset before and after ** each recursion */ int nVar; /* Number of '?' variables seen in the SQL so far */ int nVarExpr; /* Number of used slots in apVarExpr[] */ int nVarExprAlloc; /* Number of allocated slots in apVarExpr[] */ Expr **apVarExpr; /* Pointers to :aaa and $aaaa wildcard expressions */ u8 explain; /* True if the EXPLAIN flag is found on the query */ Token sErrToken; /* The token at which the error occurred */ Token sNameToken; /* Token with unqualified schema object name */ Token sLastToken; /* The last token parsed */ const char *zSql; /* All SQL text */ const char *zTail; /* All SQL text past the last semicolon parsed */ Table *pNewTable; /* A table being constructed by CREATE TABLE */ Trigger *pNewTrigger; /* Trigger under construct by a CREATE TRIGGER */ TriggerStack *trigStack; /* Trigger actions being coded */ const char *zAuthContext; /* The 6th parameter to db->xAuth callbacks */#ifndef SQLITE_OMIT_VIRTUALTABLE Token sArg; /* Complete text of a module argument */ u8 declareVtab; /* True if inside sqlite3_declare_vtab() */ int nVtabLock; /* Number of virtual tables to lock */ Table **apVtabLock; /* Pointer to virtual tables needing locking */#endif int nHeight; /* Expression tree height of current sub-select */};#ifdef SQLITE_OMIT_VIRTUALTABLE #define IN_DECLARE_VTAB 0#else #define IN_DECLARE_VTAB (pParse->declareVtab)#endif/*** An instance of the following structure can be declared on a stack and used** to save the Parse.zAuthContext value so that it can be restored later.*/struct AuthContext { const char *zAuthContext; /* Put saved Parse.zAuthContext here */ Parse *pParse; /* The Parse structure */};/*** Bitfield flags for P2 value in OP_Insert and OP_Delete*/#define OPFLAG_NCHANGE 1 /* Set to update db->nChange */#define OPFLAG_LASTROWID 2 /* Set to update db->lastRowid */#define OPFLAG_ISUPDATE 4 /* This OP_Insert is an sql UPDATE */#define OPFLAG_APPEND 8 /* This is likely to be an append *//* * Each trigger present in the database schema is stored as an instance of * struct Trigger. * * Pointers to instances of struct Trigger are stored in two ways. * 1. In the "trigHash" hash table (part of the sqlite3* that represents the * database). This allows Trigger structures to be retrieved by name. * 2. All triggers associated with a single table form a linked list, using the * pNext member of struct Trigger. A pointer to the first element of the * linked list is stored as the "pTrigger" member of the associated * struct Table. * * The "step_list" member points to the first element of a linked list * containing the SQL statements specified as the trigger program. */struct Trigger { char *name; /* The name of the trigger */ char *table; /* The table or view to which the trigger applies */ u8 op; /* One of TK_DELETE, TK_UPDATE, TK_INSERT */ u8 tr_tm; /* One of TRIGGER_BEFORE, TRIGGER_AFTER */ Expr *pWhen; /* The WHEN clause of the expresion (may be NULL) */ IdList *pColumns; /* If this is an UPDATE OF <column-list> trigger, the <column-list> is stored here */ Token nameToken; /* Token containing zName. Use during parsing only */ Schema *pSchema; /* Schema containing the trigger */ Schema *pTabSchema; /* Schema containing the table */ TriggerStep *step_list; /* Link list of trigger program steps */ Trigger *pNext; /* Next trigger associated with the table */};/*** A trigger is either a BEFORE or an AFTER trigger. The following constants** determine which. **** If there are multiple triggers, you might of some BEFORE and some AFTER.** In that cases, the constants below can be ORed together.*/#define TRIGGER_BEFORE 1#define TRIGGER_AFTER 2/* * An instance of struct TriggerStep is used to store a single SQL statement * that is a part of a trigger-program. * * Instances of struct TriggerStep are stored in a singly linked list (linked * using the "pNext" member) referenced by the "step_list" member of the * associated struct Trigger instance. The first element of the linked list is * the first step of the trigger-program. * * The "op" member indicates whether this is a "DELETE", "INSERT", "UPDATE" or * "SELECT" statement. The meanings of the other members is determined by the * value of "op" as follows: * * (op == TK_INSERT) * orconf -> stores the ON CONFLICT algorithm * pSelect -> If this is an INSERT INTO ... SELECT ... statement, then * this stores a pointer to the SELECT statement. Otherwise NULL. * target -> A token holding the name of the table to insert into. * pExprList -> If this is an INSERT INTO ... VALUES ... statement, then * this stores values to be inserted. Otherwise NULL. * pIdList -> If this is an INSERT INTO ... (<column-names>) VALUES ... * statement, then this stores the column-names to be * inserted into. * * (op == TK_DELETE) * target -> A token holding the name of the table to delete from. * pWhere -> The WHERE clause of the DELETE statement if one is specified. * Otherwise NULL. * * (op == TK_UPDATE) * target -> A token holding the name of the table to update rows of. * pWhere -> The WHERE clause of the UPDATE statement if one is specified. * Otherwise NULL. * pExprList -> A list of the columns to update and the expressions to update * them to. See sqlite3Update() documentation of "pChanges" * argument. * */struct TriggerStep { int op; /* One of TK_DELETE, TK_UPDATE, TK_INSERT, TK_SELECT */ int orconf; /* OE_Rollback etc. */ Trigger *pTrig; /* The trigger that this step is a part of */ Select *pSelect; /* Valid for SELECT and sometimes INSERT steps (when pExprList == 0) */ Token target; /* Valid for DELETE, UPDATE, INSERT steps */ Expr *pWhere; /* Valid for DELETE, UPDATE steps */ ExprList *pExprList; /* Valid for UPDATE statements and sometimes INSERT steps (when pSelect == 0) */ IdList *pIdList; /* Valid for INSERT statements only */ TriggerStep *pNext; /* Next in the link-list */ TriggerStep *pLast; /* Last element in link-list. Valid for 1st elem only */};/* * An instance of struct TriggerStack stores information required during code * generation of a single trigger program. While the trigger program is being * coded, its associated TriggerStack instance is pointed to by the * "pTriggerStack" member of the Parse structure. * * The pTab member points to the table that triggers are being coded on. The * newIdx member contains the index of the vdbe cursor that points at the temp * table that stores the new.* references. If new.* references are not valid * for the trigger being coded (for example an ON DELETE trigger), then newIdx * is set to -1. The oldIdx member is analogous to newIdx, for old.* references. * * The ON CONFLICT policy to be used for the trigger program steps is stored * as the orconf member. If this is OE_Default, then the ON CONFLICT clause * specified for individual triggers steps is used. * * struct TriggerStack has a "pNext" member, to allow linked lists to be * constructed. When coding nested triggers (triggers fired by other triggers) * each nested trigger stores its parent trigger's TriggerStack as the "pNext" * pointer. Once the nested trigger has been coded, the pNext value is restored * to the pTriggerStack member of the Parse stucture and coding of the parent * trigger continues. * * Before a nested trigger is coded, the linked list pointed to by the * pTriggerStack is scanned to ensure that the trigger is not about to be coded * recursively. If this condition is detected, the nested trigger is not coded. */struct TriggerStack { Table *pTab; /* Table that triggers are currently being coded on */ int newIdx; /* Index of vdbe cursor to "new" temp table */ int oldIdx; /* Index of vdbe cursor to "old" temp table */ u32 newColMask; u32 oldColMask; int orconf; /* Current orconf policy */ int ignoreJump; /* where to jump to for a RAISE(IGNORE) */ Trigger *pTrigger; /* The trigger currently being coded */ TriggerStack *pNext; /* Next trigger down on the trigger stack */};/*** The following structure contains information used by the sqliteFix...** routines as they walk the parse tree to make database references** explicit. */typedef struct DbFixer DbFixer;struct DbFixer { Parse *pParse; /* The parsing context. Error messages written here */ const char *zDb; /* Make sure all objects are contained in this database */ const char *zType; /* Type of the container - used for error messages */ const Token *pName; /* Name of the container - used for error messages */};/*** An objected used to accumulate the text of a string where we** do not necessarily know how big the string will be in the end.*/struct StrAccum { sqlite3 *db; /* Optional database for lookaside. Can be NULL */ char *zBase; /* A base allocation. Not from malloc. */ char *zText; /* The string collected so far */ int nChar; /* Length of the string so far */ int nAlloc; /* Amount of space allocated in zText */ int mxAlloc; /* Maximum allowed string length */ u8 mallocFailed; /* Becomes true if any memory allocation fails */ u8 useMalloc; /* True if zText is enlargable using realloc */ u8 tooBig; /* Becomes true if string size exceeds limits */};/*** A pointer to this structure is used to communicate information** from sqlite3Init and OP_ParseSchema into the sqlite3InitCallback.*/typedef struct { sqlite3 *db; /* The database being initialized */ int iDb; /* 0 for main database. 1 for TEMP, 2.. for ATTACHed */ char **pzErrMsg; /* Error message stored here */ int rc; /* Result code stored here */} InitData;/*** Structure containing global configuration data for the SQLite library.**** This structure also contains some state information.*/struct Sqlite3Config { int bMemstat; /* True to enable memory status */ int bCoreMutex; /* True to enable core mutexing */ int bFullMutex; /* True to enable full mutexing */ int mxStrlen; /* Maximum string length */ int szLookaside; /* Default lookaside buffer size */ int nLookaside; /* Default lookaside buffer count */ sqlite3_mem_methods m; /* Low-level memory allocation interface */ sqlite3_mutex_methods mutex; /* Low-level mutex interface */ void *pHeap; /* Heap storage space */ int nHeap; /* Size of pHeap[] */ int mnReq, mxReq; /* Min and max heap requests sizes */ void *pScratch; /* Scratch memory */ int szScratch; /* Size of each scratch buffer */ int nScratch; /* Number of scratch buffers */ void *pPage; /* Page cache memory */ int szPage; /* Size of each page in pPage[] */ int nPage; /* Number of pages in pPage[] */ int isInit; /* True after initialization has finished */ int isMallocInit; /* True after malloc is initialized */ sqlite3_mutex *pInitMutex; /* Mutex used by sqlite3_initialize() */ int nSmall; /* alloc size threshold used by mem6.c */ int mxParserStack; /* maximum depth of the parser stack */};/*** Assuming zIn points to the first byte of a UTF-8 character,** advance zIn to point to the first byte of the next UTF-8 character.*/#define SQLITE_SKIP_UTF8(zIn) { \ if( (*(zIn++))>=0xc0 ){ \ while( (*zIn & 0xc0)==0x80 ){ zIn++; } \ } \}/*** The SQLITE_CORRUPT_BKPT macro can be either a constant (for production** builds) or a function call (for debugging). If it is a function call,** it allows the operator to set a breakpoint at the spot where database** corruption is first detected.*/#ifdef SQLITE_DEBUG int sqlite3Corrupt(void);# define SQLITE_CORRUPT_BKPT sqlite3Corrupt()#else# define SQLITE_CORRUPT_BKPT SQLITE_CORRUPT#endif/*** Internal function prototypes*/int sqlite3StrICmp(const char *, const char *);int sqlite3StrNICmp(const char *, const char *, int);int sqlite3IsNumber(const char*, int*, u8);int sqlite3Strlen(sqlite3*, const char*);int sqlite3MallocInit(void);void sqlite3MallocEnd(void);void *sqlite3Malloc(int);void *sqlite3MallocZero(int);void *sqlite3DbMallocZero(sqlite3*, int);void *sqlite3DbMallocRaw(sqlite3*, int);char *sqlite3DbStrDup(sqlite3*,const char*);char *sqlite3DbStrNDup(sqlite3*,const char*, int);void *sqlite3Realloc(void*, int);void *sqlite3DbReallocOrFree(sqlite3 *, void *, int);void *sqlite3DbRealloc(sqlite3 *, void *, int);void sqlite3DbFree(sqlite3*, void*);int sqlite3MallocSize(void*);int sqlite3DbMallocSize(sqlite3*, void*);void *sqlite3ScratchMalloc(int);void sqlite3ScratchFree(void*);void *sqlite3PageMalloc(int);void sqlite3PageFree(void*);void sqlite3MemSetDefault(void);const sqlite3_mem_methods *sqlite3MemGetDefault(void);const sqlite3_mem_methods *sqlite3MemGetMemsys5(void);const sqlite3_mem_methods *sqlite3MemGetMemsys3(void);const sqlite3_mem_methods *sqlite3MemGetMemsys6(void);void sqlite3BenignMallocHooks(void (*)(void), void (*)(void));#ifndef SQLITE_MUTEX_NOOP sqlite3_mutex_methods *sqlite3DefaultMutex(void); sqlite3_mutex *sqlite3MutexAlloc(int); int sqlite3MutexInit(void); int sqlite3MutexEnd(void);#endifvoid sqlite3StatusReset(void);int sqlite3StatusValue(int);void sqlite3StatusAdd(int, int);void sqlite3StatusSet(int, int);int sqlite3IsNaN(double);void sqlite3VXPrintf(StrAccum*, int, const char*, va_list);char *sqlite3MPrintf(sqlite3*,const char*, ...);char *sqlite3VMPrintf(sqlite3*,const char*, va_list);char *sqlite3MAppendf(sqlite3*,char*,const char*,...);#if defined(SQLITE_TEST) || defined(SQLITE_DEBUG) void sqlite3DebugPrintf(const char*, ...);#endif#if defined(SQLITE_TEST) void *sqlite3TestTextToPtr(const char*);#endifvoid sqlite3SetString(char **, sqlite3*, const char*, ...);void sqlite3ErrorMsg(Parse*, const char*, ...);void sqlite3ErrorClear(Parse*);void sqlite3Dequote(char*);void sqlite3DequoteExpr(sqlite3*, Expr*);int sqlite3KeywordCode(const unsigned char*, int);int sqlite3RunParser(Parse*, const char*, char **);void sqlite3FinishCoding(Parse*);int sqlite3GetTempReg(Parse*);void sqlite3ReleaseTempReg(Parse*,int);int sqlite3GetTempRange(Parse*,int);void sqlite3ReleaseTempRange(Parse*,int,int);Expr *sqlite3Expr(sqlite3*, int, Expr*, Expr*, const Token*);Expr *sqlite3PExpr(Parse*, int, Expr*, Expr*, const Token*);Expr *sqlite3RegisterExpr(Parse*,Token*);Expr *sqlite3ExprAnd(sqlite3*,Expr*, Expr*);void sqlite3ExprSpan(Expr*,Token*,Token*);Expr *sqlite3ExprFunction(Parse*,ExprList*, Token*);void sqlite3ExprAssignVarNumber(Parse*, Expr*);void sqlite3ExprDelete(sqlite3*, Expr*);ExprList *sqlite3ExprListAppend(Parse*,ExprList*,Expr*,Token*);void sqlite3ExprListDelete(sqlite3*, ExprList*);int sqlite3Init(sqlite3*, char**);int sqlite3InitCallback(void*, int, char**, char**);void sqlite3Pragma(Parse*,Token*,Token*,Token*,int);void sqlite3ResetInternalSchema(sqlite3*, int);void sqlite3BeginParse(Parse*,int);void sqlite3CommitInternalChanges(sqlite3*);Table *sqlite3ResultSetOfSelect(Parse*,char*,Select*);void sqlite3OpenMasterTable(Parse *, int);void sqlite3StartTable(Parse*,Token*,Token*,int,int,int,int);void sqlite3AddColumn(Parse*,Token*);void sqlite3AddNotNull(Parse*, int);void sqlite3AddPrimaryKey(Parse*, ExprList*, int, int, int);void sqlite3AddCheckConstraint(Parse*, Expr*);void sqlite3AddColumnType(Parse*,Token*);void sqlite3AddDefaultValue(Parse*,Expr*);void sqlite3AddCollateType(Parse*, Token*);void sqlite3EndTable(Parse*,Token*,Token*,Select*);Bitvec *sqlite3BitvecCreate(u32);int sqlite3BitvecTest(Bitvec*, u32);int sqlite3BitvecSet(Bitvec*, u32);void sqlite3BitvecClear(Bitvec*, u32);void sqlite3BitvecDestroy(Bitvec*);int sqlite3BitvecBuiltinTest(int,int*);void sqlite3CreateView(Parse*,Token*,Token*,Token*,Select*,int,int);#if !defined(SQLITE_OMIT_VIEW) || !defined(SQLITE_OMIT_VIRTUALTABLE) int sqlite3ViewGetColumnNames(Parse*,Table*);#else# define sqlite3ViewGetColumnNames(A,B) 0#endifvoid sqlite3DropTable(Parse*, SrcList*, int, int);void sqlite3DeleteTable(Table*);void sqlite3Insert(Parse*, SrcList*, ExprList*, Select*, IdList*, int);void *sqlite3ArrayAllocate(sqlite3*,void*,int,int,int*,int*,int*);IdList *sqlite3IdListAppend(sqlite3*, IdList*, Token*);int sqlite3IdListIndex(IdList*,const char*);SrcList *sqlite3SrcListAppend(sqlite3*, SrcList*, Token*, Token*);SrcList *sqlite3SrcListAppendFromTerm(Parse*, SrcList*, Token*, Token*, Token*, Select*, Expr*, IdList*);void sqlite3SrcListShiftJoinType(SrcList*);void sqlite3SrcListAssignCursors(Parse*, SrcList*);void sqlite3IdListDelete(sqlite3*, IdList*);void sqlite3SrcListDelete(sqlite3*, SrcList*);void sqlite3CreateIndex(Parse*,Token*,Token*,SrcList*,ExprList*,int,Token*, Token*, int, int);void sqlite3DropIndex(Parse*, SrcList*, int);int sqlite3Select(Parse*, Select*, SelectDest*, Select*, int, int*);Select *sqlite3SelectNew(Parse*,ExprList*,SrcList*,Expr*,ExprList*, Expr*,ExprList*,int,Expr*,Expr*);void sqlite3SelectDelete(sqlite3*, Select*);Table *sqlite3SrcListLookup(Parse*, SrcList*);int sqlite3IsReadOnly(Parse*, Table*, int);void sqlite3OpenTable(Parse*, int iCur, int iDb, Table*, int);void sqlite3DeleteFrom(Parse*, SrcList*, Expr*);void sqlite3Update(Parse*, SrcList*, ExprList*, Expr*, int);WhereInfo *sqlite3WhereBegin(Parse*, SrcList*, Expr*, ExprList**, u8);void sqlite3WhereEnd(WhereInfo*);int sqlite3ExprCodeGetColumn(Parse*, Table*, int, int, int, int);void sqlite3ExprCodeMove(Parse*, int, int, int);void sqlite3ExprCodeCopy(Parse*, int, int, int);void sqlite3ExprClearColumnCache(Parse*, int);void sqlite3ExprCacheAffinityChange(Parse*, int, int);int sqlite3ExprWritableRegister(Parse*,int,int);void sqlite3ExprHardCopy(Parse*,int,int);int sqlite3ExprCode(Parse*, Expr*, int);int sqlite3ExprCodeTemp(Parse*, Expr*, int*);int sqlite3ExprCodeTarget(Parse*, Expr*, int);int sqlite3ExprCodeAndCache(Parse*, Expr*, int);void sqlite3ExprCodeConstants(Parse*, Expr*);int sqlite3ExprCodeExprList(Parse*, ExprList*, int, int);void sqlite3ExprIfTrue(Parse*, Expr*, int, int);void sqlite3ExprIfFalse(Parse*, Expr*, int, int);Table *sqlite3FindTable(sqlite3*,const char*, const char*);Table *sqlite3LocateTable(Parse*,int isView,const char*, const char*);Index *sqlite3FindIndex(sqlite3*,const char*, const char*);void sqlite3UnlinkAndDeleteTable(sqlite3*,int,const char*);void sqlite3UnlinkAndDeleteIndex(sqlite3*,int,const char*);void sqlite3Vacuum(Parse*);int sqlite3RunVacuum(char**, sqlite3*);char *sqlite3NameFromToken(sqlite3*, Token*);int sqlite3ExprCompare(Expr*, Expr*);int sqlite3ExprResolveNames(NameContext *, Expr *);void sqlite3ExprAnalyzeAggregates(NameContext*, Expr*);void sqlite3ExprAnalyzeAggList(NameContext*,ExprList*);Vdbe *sqlite3GetVdbe(Parse*);Expr *sqlite3CreateIdExpr(Parse *, const char*);void sqlite3PrngSaveState(void);void sqlite3PrngRestoreState(void);void sqlite3PrngResetState(void);void sqlite3RollbackAll(sqlite3*);void sqlite3CodeVerifySchema(Parse*, int);void sqlite3BeginTransaction(Parse*, int);void sqlite3CommitTransaction(Parse*);void sqlite3RollbackTransaction(Parse*);int sqlite3ExprIsConstant(Expr*);int sqlite3ExprIsConstantNotJoin(Expr*);int sqlite3ExprIsConstantOrFunction(Expr*);int sqlite3ExprIsInteger(Expr*, int*);int sqlite3IsRowid(const char*);void sqlite3GenerateRowDelete(Parse*, Table*, int, int, int);void sqlite3GenerateRowIndexDelete(Parse*, Table*, int, int*);int sqlite3GenerateIndexKey(Parse*, Index*, int, int, int);void sqlite3GenerateConstraintChecks(Parse*,Table*,int,int, int*,int,int,int,int);void sqlite3CompleteInsertion(Parse*, Table*, int, int, int*,int,int,int,int);int sqlite3OpenTableAndIndices(Parse*, Table*, int, int);void sqlite3BeginWriteOperation(Parse*, int, int);Expr *sqlite3ExprDup(sqlite3*,Expr*);void sqlite3TokenCopy(sqlite3*,Token*, Token*);ExprList *sqlite3ExprListDup(sqlite3*,ExprList*);SrcList *sqlite3SrcListDup(sqlite3*,SrcList*);IdList *sqlite3IdListDup(sqlite3*,IdList*);Select *sqlite3SelectDup(sqlite3*,Select*);FuncDef *sqlite3FindFunction(sqlite3*,const char*,int,int,u8,int);void sqlite3RegisterBuiltinFunctions(sqlite3*);void sqlite3RegisterDateTimeFunctions(sqlite3*);#ifdef SQLITE_DEBUG int sqlite3SafetyOn(sqlite3*); int sqlite3SafetyOff(sqlite3*);#else# define sqlite3SafetyOn(A) 0# define sqlite3SafetyOff(A) 0#endifint sqlite3SafetyCheckOk(sqlite3*);int sqlite3SafetyCheckSickOrOk(sqlite3*);void sqlite3ChangeCookie(Parse*, int);void sqlite3MaterializeView(Parse*, Select*, Expr*, int);#ifndef SQLITE_OMIT_TRIGGER void sqlite3BeginTrigger(Parse*, Token*,Token*,int,int,IdList*,SrcList*, Expr*,int, int); void sqlite3FinishTrigger(Parse*, TriggerStep*, Token*); void sqlite3DropTrigger(Parse*, SrcList*, int); void sqlite3DropTriggerPtr(Parse*, Trigger*); int sqlite3TriggersExist(Parse*, Table*, int, ExprList*); int sqlite3CodeRowTrigger(Parse*, int, ExprList*, int, Table *, int, int, int, int, u32*, u32*); void sqliteViewTriggers(Parse*, Table*, Expr*, int, ExprList*); void sqlite3DeleteTriggerStep(sqlite3*, TriggerStep*); TriggerStep *sqlite3TriggerSelectStep(sqlite3*,Select*); TriggerStep *sqlite3TriggerInsertStep(sqlite3*,Token*, IdList*, ExprList*,Select*,int); TriggerStep *sqlite3TriggerUpdateStep(sqlite3*,Token*,ExprList*, Expr*, int); TriggerStep *sqlite3TriggerDeleteStep(sqlite3*,Token*, Expr*); void sqlite3DeleteTrigger(sqlite3*, Trigger*); void sqlite3UnlinkAndDeleteTrigger(sqlite3*,int,const char*);#else# define sqlite3TriggersExist(A,B,C,D,E,F) 0# define sqlite3DeleteTrigger(A,B)# define sqlite3DropTriggerPtr(A,B)# define sqlite3UnlinkAndDeleteTrigger(A,B,C)# define sqlite3CodeRowTrigger(A,B,C,D,E,F,G,H,I,J,K) 0#endifint sqlite3JoinType(Parse*, Token*, Token*, Token*);void sqlite3CreateForeignKey(Parse*, ExprList*, Token*, ExprList*, int);void sqlite3DeferForeignKey(Parse*, int);#ifndef SQLITE_OMIT_AUTHORIZATION void sqlite3AuthRead(Parse*,Expr*,Schema*,SrcList*); int sqlite3AuthCheck(Parse*,int, const char*, const char*, const char*); void sqlite3AuthContextPush(Parse*, AuthContext*, const char*); void sqlite3AuthContextPop(AuthContext*);#else# define sqlite3AuthRead(a,b,c,d)# define sqlite3AuthCheck(a,b,c,d,e) SQLITE_OK# define sqlite3AuthContextPush(a,b,c)# define sqlite3AuthContextPop(a) ((void)(a))#endifvoid sqlite3Attach(Parse*, Expr*, Expr*, Expr*);void sqlite3Detach(Parse*, Expr*);int sqlite3BtreeFactory(const sqlite3 *db, const char *zFilename, int omitJournal, int nCache, int flags, Btree **ppBtree);int sqlite3FixInit(DbFixer*, Parse*, int, const char*, const Token*);int sqlite3FixSrcList(DbFixer*, SrcList*);int sqlite3FixSelect(DbFixer*, Select*);int sqlite3FixExpr(DbFixer*, Expr*);int sqlite3FixExprList(DbFixer*, ExprList*);int sqlite3FixTriggerStep(DbFixer*, TriggerStep*);int sqlite3AtoF(const char *z, double*);char *sqlite3_snprintf(int,char*,const char*,...);int sqlite3GetInt32(const char *, int*);int sqlite3FitsIn64Bits(const char *, int);int sqlite3Utf16ByteLen(const void *pData, int nChar);int sqlite3Utf8CharLen(const char *pData, int nByte);int sqlite3Utf8Read(const u8*, const u8*, const u8**);/*** Routines to read and write variable-length integers. These used to** be defined locally, but now we use the varint routines in the util.c** file. Code should use the MACRO forms below, as the Varint32 versions** are coded to assume the single byte case is already handled (which ** the MACRO form does).*/int sqlite3PutVarint(unsigned char*, u64);int sqlite3PutVarint32(unsigned char*, u32);int sqlite3GetVarint(const unsigned char *, u64 *);int sqlite3GetVarint32(const unsigned char *, u32 *);int sqlite3VarintLen(u64 v);/*** The header of a record consists of a sequence variable-length integers.** These integers are almost always small and are encoded as a single byte.** The following macros take advantage this fact to provide a fast encode** and decode of the integers in a record header. It is faster for the common** case where the integer is a single byte. It is a little slower when the** integer is two or more bytes. But overall it is faster.**** The following expressions are equivalent:**** x = sqlite3GetVarint32( A, &B );** x = sqlite3PutVarint32( A, B );**** x = getVarint32( A, B );** x = putVarint32( A, B );***/#define getVarint32(A,B) ((*(A)<(unsigned char)0x80) ? ((B) = (u32)*(A)),1 : sqlite3GetVarint32((A), &(B)))#define putVarint32(A,B) (((B)<(u32)0x80) ? (*(A) = (unsigned char)(B)),1 : sqlite3PutVarint32((A), (B)))#define getVarint sqlite3GetVarint#define putVarint sqlite3PutVarintvoid sqlite3IndexAffinityStr(Vdbe *, Index *);void sqlite3TableAffinityStr(Vdbe *, Table *);char sqlite3CompareAffinity(Expr *pExpr, char aff2);int sqlite3IndexAffinityOk(Expr *pExpr, char idx_affinity);char sqlite3ExprAffinity(Expr *pExpr);int sqlite3Atoi64(const char*, i64*);void sqlite3Error(sqlite3*, int, const char*,...);void *sqlite3HexToBlob(sqlite3*, const char *z, int n);int sqlite3TwoPartName(Parse *, Token *, Token *, Token **);const char *sqlite3ErrStr(int);int sqlite3ReadSchema(Parse *pParse);CollSeq *sqlite3FindCollSeq(sqlite3*,u8 enc, const char *,int,int);CollSeq *sqlite3LocateCollSeq(Parse *pParse, const char *zName, int nName);CollSeq *sqlite3ExprCollSeq(Parse *pParse, Expr *pExpr);Expr *sqlite3ExprSetColl(Parse *pParse, Expr *, Token *);int sqlite3CheckCollSeq(Parse *, CollSeq *);int sqlite3CheckObjectName(Parse *, const char *);void sqlite3VdbeSetChanges(sqlite3 *, int);const void *sqlite3ValueText(sqlite3_value*, u8);int sqlite3ValueBytes(sqlite3_value*, u8);void sqlite3ValueSetStr(sqlite3_value*, int, const void *,u8, void(*)(void*));void sqlite3ValueFree(sqlite3_value*);sqlite3_value *sqlite3ValueNew(sqlite3 *);char *sqlite3Utf16to8(sqlite3 *, const void*, int);int sqlite3ValueFromExpr(sqlite3 *, Expr *, u8, u8, sqlite3_value **);void sqlite3ValueApplyAffinity(sqlite3_value *, u8, u8);#ifndef SQLITE_AMALGAMATIONextern const unsigned char sqlite3UpperToLower[];extern struct Sqlite3Config sqlite3Config;#endifvoid sqlite3RootPageMoved(Db*, int, int);void sqlite3Reindex(Parse*, Token*, Token*);void sqlite3AlterFunctions(sqlite3*);void sqlite3AlterRenameTable(Parse*, SrcList*, Token*);int sqlite3GetToken(const unsigned char *, int *);void sqlite3NestedParse(Parse*, const char*, ...);void sqlite3ExpirePreparedStatements(sqlite3*);void sqlite3CodeSubselect(Parse *, Expr *, int);int sqlite3SelectResolve(Parse *, Select *, NameContext *);void sqlite3ColumnDefault(Vdbe *, Table *, int);void sqlite3AlterFinishAddColumn(Parse *, Token *);void sqlite3AlterBeginAddColumn(Parse *, SrcList *);CollSeq *sqlite3GetCollSeq(sqlite3*, CollSeq *, const char *, int);char sqlite3AffinityType(const Token*);void sqlite3Analyze(Parse*, Token*, Token*);int sqlite3InvokeBusyHandler(BusyHandler*);int sqlite3FindDb(sqlite3*, Token*);int sqlite3AnalysisLoad(sqlite3*,int iDB);void sqlite3DefaultRowEst(Index*);void sqlite3RegisterLikeFunctions(sqlite3*, int);int sqlite3IsLikeFunction(sqlite3*,Expr*,int*,char*);void sqlite3AttachFunctions(sqlite3 *);void sqlite3MinimumFileFormat(Parse*, int, int);void sqlite3SchemaFree(void *);Schema *sqlite3SchemaGet(sqlite3 *, Btree *);int sqlite3SchemaToIndex(sqlite3 *db, Schema *);KeyInfo *sqlite3IndexKeyinfo(Parse *, Index *);int sqlite3CreateFunc(sqlite3 *, const char *, int, int, void *, void (*)(sqlite3_context*,int,sqlite3_value **), void (*)(sqlite3_context*,int,sqlite3_value **), void (*)(sqlite3_context*));int sqlite3ApiExit(sqlite3 *db, int);int sqlite3OpenTempDatabase(Parse *);void sqlite3StrAccumInit(StrAccum*, char*, int, int);void sqlite3StrAccumAppend(StrAccum*,const char*,int);char *sqlite3StrAccumFinish(StrAccum*);void sqlite3StrAccumReset(StrAccum*);void sqlite3SelectDestInit(SelectDest*,int,int);/*** The interface to the LEMON-generated parser*/void *sqlite3ParserAlloc(void*(*)(size_t));void sqlite3ParserFree(void*, void(*)(void*));void sqlite3Parser(void*, int, Token, Parse*);#ifdef YYTRACKMAXSTACKDEPTH int sqlite3ParserStackPeak(void*);#endifint sqlite3AutoLoadExtensions(sqlite3*);#ifndef SQLITE_OMIT_LOAD_EXTENSION void sqlite3CloseExtensions(sqlite3*);#else# define sqlite3CloseExtensions(X)#endif#ifndef SQLITE_OMIT_SHARED_CACHE void sqlite3TableLock(Parse *, int, int, u8, const char *);#else #define sqlite3TableLock(v,w,x,y,z)#endif#ifdef SQLITE_TEST int sqlite3Utf8To8(unsigned char*);#endif#ifdef SQLITE_OMIT_VIRTUALTABLE# define sqlite3VtabClear(X)# define sqlite3VtabSync(X,Y) SQLITE_OK# define sqlite3VtabRollback(X)# define sqlite3VtabCommit(X)#else void sqlite3VtabClear(Table*); int sqlite3VtabSync(sqlite3 *db, char **); int sqlite3VtabRollback(sqlite3 *db); int sqlite3VtabCommit(sqlite3 *db);#endifvoid sqlite3VtabMakeWritable(Parse*,Table*);void sqlite3VtabLock(sqlite3_vtab*);void sqlite3VtabUnlock(sqlite3*, sqlite3_vtab*);void sqlite3VtabBeginParse(Parse*, Token*, Token*, Token*);void sqlite3VtabFinishParse(Parse*, Token*);void sqlite3VtabArgInit(Parse*);void sqlite3VtabArgExtend(Parse*, Token*);int sqlite3VtabCallCreate(sqlite3*, int, const char *, char **);int sqlite3VtabCallConnect(Parse*, Table*);int sqlite3VtabCallDestroy(sqlite3*, int, const char *);int sqlite3VtabBegin(sqlite3 *, sqlite3_vtab *);FuncDef *sqlite3VtabOverloadFunction(sqlite3 *,FuncDef*, int nArg, Expr*);void sqlite3InvalidFunction(sqlite3_context*,int,sqlite3_value**);int sqlite3Reprepare(Vdbe*);void sqlite3ExprListCheckLength(Parse*, ExprList*, const char*);CollSeq *sqlite3BinaryCompareCollSeq(Parse *, Expr *, Expr *);/*** Available fault injectors. Should be numbered beginning with 0.*/#define SQLITE_FAULTINJECTOR_MALLOC 0#define SQLITE_FAULTINJECTOR_COUNT 1/*** The interface to the code in fault.c used for identifying "benign"** malloc failures. This is only present if SQLITE_OMIT_BUILTIN_TEST** is not defined.*/#ifndef SQLITE_OMIT_BUILTIN_TEST void sqlite3BeginBenignMalloc(void); void sqlite3EndBenignMalloc(void);#else #define sqlite3BeginBenignMalloc() #define sqlite3EndBenignMalloc()#endif#define IN_INDEX_ROWID 1#define IN_INDEX_EPH 2#define IN_INDEX_INDEX 3int sqlite3FindInIndex(Parse *, Expr *, int*);#ifdef SQLITE_ENABLE_ATOMIC_WRITE int sqlite3JournalOpen(sqlite3_vfs *, const char *, sqlite3_file *, int, int); int sqlite3JournalSize(sqlite3_vfs *); int sqlite3JournalCreate(sqlite3_file *);#else #define sqlite3JournalSize(pVfs) ((pVfs)->szOsFile)#endif#if SQLITE_MAX_EXPR_DEPTH>0 void sqlite3ExprSetHeight(Parse *pParse, Expr *p); int sqlite3SelectExprHeight(Select *);#else #define sqlite3ExprSetHeight(x,y) #define sqlite3SelectExprHeight(x) 0#endifu32 sqlite3Get4byte(const u8*);void sqlite3Put4byte(u8*, u32);#ifdef SQLITE_SSE#include "sseInt.h"#endif#ifdef SQLITE_DEBUG void sqlite3ParserTrace(FILE*, char *);#endif/*** If the SQLITE_ENABLE IOTRACE exists then the global variable** sqlite3IoTrace is a pointer to a printf-like routine used to** print I/O tracing messages. */#ifdef SQLITE_ENABLE_IOTRACE# define IOTRACE(A) if( sqlite3IoTrace ){ sqlite3IoTrace A; } void sqlite3VdbeIOTraceSql(Vdbe*);SQLITE_EXTERN void (*sqlite3IoTrace)(const char*,...);#else# define IOTRACE(A)# define sqlite3VdbeIOTraceSql(X)#endif#endif