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1/*
2** 2001 September 15
3**
4** The author disclaims copyright to this source code. In place of
5** a legal notice, here is a blessing:
6**
7** May you do good and not evil.
8** May you find forgiveness for yourself and forgive others.
9** May you share freely, never taking more than you give.
10**
11*************************************************************************
12** Internal interface definitions for SQLite.
13**
14** @(#) $Id: sqliteInt.h,v 1.613 2007/10/03 08:46:45 danielk1977 Exp $
15*/
16#ifndef _SQLITEINT_H_
17#define _SQLITEINT_H_
18#include "sqliteLimit.h"
19
20/*
21** For testing purposes, the various size limit constants are really
22** variables that we can modify in the testfixture.
23*/
24#ifdef SQLITE_TEST
25 #undef SQLITE_MAX_LENGTH
26 #undef SQLITE_MAX_COLUMN
27 #undef SQLITE_MAX_SQL_LENGTH
28 #undef SQLITE_MAX_EXPR_DEPTH
29 #undef SQLITE_MAX_COMPOUND_SELECT
30 #undef SQLITE_MAX_VDBE_OP
31 #undef SQLITE_MAX_FUNCTION_ARG
32 #undef SQLITE_MAX_VARIABLE_NUMBER
33 #undef SQLITE_MAX_PAGE_SIZE
34 #undef SQLITE_MAX_PAGE_COUNT
35 #undef SQLITE_MAX_LIKE_PATTERN_LENGTH
36
37 #define SQLITE_MAX_LENGTH sqlite3MAX_LENGTH
38 #define SQLITE_MAX_COLUMN sqlite3MAX_COLUMN
39 #define SQLITE_MAX_SQL_LENGTH sqlite3MAX_SQL_LENGTH
40 #define SQLITE_MAX_EXPR_DEPTH sqlite3MAX_EXPR_DEPTH
41 #define SQLITE_MAX_COMPOUND_SELECT sqlite3MAX_COMPOUND_SELECT
42 #define SQLITE_MAX_VDBE_OP sqlite3MAX_VDBE_OP
43 #define SQLITE_MAX_FUNCTION_ARG sqlite3MAX_FUNCTION_ARG
44 #define SQLITE_MAX_VARIABLE_NUMBER sqlite3MAX_VARIABLE_NUMBER
45 #define SQLITE_MAX_PAGE_SIZE sqlite3MAX_PAGE_SIZE
46 #define SQLITE_MAX_PAGE_COUNT sqlite3MAX_PAGE_COUNT
47 #define SQLITE_MAX_LIKE_PATTERN_LENGTH sqlite3MAX_LIKE_PATTERN_LENGTH
48
49 extern int sqlite3MAX_LENGTH;
50 extern int sqlite3MAX_COLUMN;
51 extern int sqlite3MAX_SQL_LENGTH;
52 extern int sqlite3MAX_EXPR_DEPTH;
53 extern int sqlite3MAX_COMPOUND_SELECT;
54 extern int sqlite3MAX_VDBE_OP;
55 extern int sqlite3MAX_FUNCTION_ARG;
56 extern int sqlite3MAX_VARIABLE_NUMBER;
57 extern int sqlite3MAX_PAGE_SIZE;
58 extern int sqlite3MAX_PAGE_COUNT;
59 extern int sqlite3MAX_LIKE_PATTERN_LENGTH;
60#endif
61
62
63/*
64** The SQLITE_THREADSAFE macro must be defined as either 0 or 1.
65** Older versions of SQLite used an optional THREADSAFE macro.
66** We support that for legacy
67*/
68#if !defined(SQLITE_THREADSAFE)
69#if defined(THREADSAFE)
70# define SQLITE_THREADSAFE THREADSAFE
71#else
72# define SQLITE_THREADSAFE 1
73#endif
74#endif
75
76/*
77** We need to define _XOPEN_SOURCE as follows in order to enable
78** recursive mutexes on most unix systems. But Mac OS X is different.
79** The _XOPEN_SOURCE define causes problems for Mac OS X we are told,
80** so it is omitted there. See ticket #2673.
81**
82** Later we learn that _XOPEN_SOURCE is poorly or incorrectly
83** implemented on some systems. So we avoid defining it at all
84** if it is already defined or if it is unneeded because we are
85** not doing a threadsafe build. Ticket #2681.
86*/
87#if !defined(_XOPEN_SOURCE) && !defined(__MACOS__) && SQLITE_THREADSAFE
88# define _XOPEN_SOURCE 500 /* Needed to enable pthread recursive mutexes */
89#endif
90
91#if defined(SQLITE_TCL) || defined(TCLSH)
92# include <tcl.h>
93#endif
94
95/*
96** Many people are failing to set -DNDEBUG=1 when compiling SQLite.
97** Setting NDEBUG makes the code smaller and run faster. So the following
98** lines are added to automatically set NDEBUG unless the -DSQLITE_DEBUG=1
99** option is set. Thus NDEBUG becomes an opt-in rather than an opt-out
100** feature.
101*/
102#if !defined(NDEBUG) && !defined(SQLITE_DEBUG)
103# define NDEBUG 1
104#endif
105
106/*
107** These #defines should enable >2GB file support on Posix if the
108** underlying operating system supports it. If the OS lacks
109** large file support, or if the OS is windows, these should be no-ops.
110**
111** Large file support can be disabled using the -DSQLITE_DISABLE_LFS switch
112** on the compiler command line. This is necessary if you are compiling
113** on a recent machine (ex: RedHat 7.2) but you want your code to work
114** on an older machine (ex: RedHat 6.0). If you compile on RedHat 7.2
115** without this option, LFS is enable. But LFS does not exist in the kernel
116** in RedHat 6.0, so the code won't work. Hence, for maximum binary
117** portability you should omit LFS.
118**
119** Similar is true for MacOS. LFS is only supported on MacOS 9 and later.
120*/
121#ifndef SQLITE_DISABLE_LFS
122# define _LARGE_FILE 1
123# ifndef _FILE_OFFSET_BITS
124# define _FILE_OFFSET_BITS 64
125# endif
126# define _LARGEFILE_SOURCE 1
127#endif
128
129#include "sqlite3.h"
130#include "hash.h"
131#include "parse.h"
132#include <stdio.h>
133#include <stdlib.h>
134#include <string.h>
135#include <assert.h>
136#include <stddef.h>
137
138#define sqlite3_isnan(X) ((X)!=(X))
139
140/*
141** If compiling for a processor that lacks floating point support,
142** substitute integer for floating-point
143*/
144#ifdef SQLITE_OMIT_FLOATING_POINT
145# define double sqlite_int64
146# define LONGDOUBLE_TYPE sqlite_int64
147# ifndef SQLITE_BIG_DBL
148# define SQLITE_BIG_DBL (0x7fffffffffffffff)
149# endif
150# define SQLITE_OMIT_DATETIME_FUNCS 1
151# define SQLITE_OMIT_TRACE 1
152# undef SQLITE_MIXED_ENDIAN_64BIT_FLOAT
153#endif
154#ifndef SQLITE_BIG_DBL
155# define SQLITE_BIG_DBL (1e99)
156#endif
157
158/*
159** OMIT_TEMPDB is set to 1 if SQLITE_OMIT_TEMPDB is defined, or 0
160** afterward. Having this macro allows us to cause the C compiler
161** to omit code used by TEMP tables without messy #ifndef statements.
162*/
163#ifdef SQLITE_OMIT_TEMPDB
164#define OMIT_TEMPDB 1
165#else
166#define OMIT_TEMPDB 0
167#endif
168
169/*
170** If the following macro is set to 1, then NULL values are considered
171** distinct when determining whether or not two entries are the same
172** in a UNIQUE index. This is the way PostgreSQL, Oracle, DB2, MySQL,
173** OCELOT, and Firebird all work. The SQL92 spec explicitly says this
174** is the way things are suppose to work.
175**
176** If the following macro is set to 0, the NULLs are indistinct for
177** a UNIQUE index. In this mode, you can only have a single NULL entry
178** for a column declared UNIQUE. This is the way Informix and SQL Server
179** work.
180*/
181#define NULL_DISTINCT_FOR_UNIQUE 1
182
183/*
184** The "file format" number is an integer that is incremented whenever
185** the VDBE-level file format changes. The following macros define the
186** the default file format for new databases and the maximum file format
187** that the library can read.
188*/
189#define SQLITE_MAX_FILE_FORMAT 4
190#ifndef SQLITE_DEFAULT_FILE_FORMAT
191# define SQLITE_DEFAULT_FILE_FORMAT 1
192#endif
193
194/*
195** Provide a default value for TEMP_STORE in case it is not specified
196** on the command-line
197*/
198#ifndef TEMP_STORE
199# define TEMP_STORE 1
200#endif
201
202/*
203** GCC does not define the offsetof() macro so we'll have to do it
204** ourselves.
205*/
206#ifndef offsetof
207#define offsetof(STRUCTURE,FIELD) ((int)((char*)&((STRUCTURE*)0)->FIELD))
208#endif
209
210/*
211** Check to see if this machine uses EBCDIC. (Yes, believe it or
212** not, there are still machines out there that use EBCDIC.)
213*/
214#if 'A' == '\301'
215# define SQLITE_EBCDIC 1
216#else
217# define SQLITE_ASCII 1
218#endif
219
220/*
221** Integers of known sizes. These typedefs might change for architectures
222** where the sizes very. Preprocessor macros are available so that the
223** types can be conveniently redefined at compile-type. Like this:
224**
225** cc '-DUINTPTR_TYPE=long long int' ...
226*/
227#ifndef UINT32_TYPE
228# define UINT32_TYPE unsigned int
229#endif
230#ifndef UINT16_TYPE
231# define UINT16_TYPE unsigned short int
232#endif
233#ifndef INT16_TYPE
234# define INT16_TYPE short int
235#endif
236#ifndef UINT8_TYPE
237# define UINT8_TYPE unsigned char
238#endif
239#ifndef INT8_TYPE
240# define INT8_TYPE signed char
241#endif
242#ifndef LONGDOUBLE_TYPE
243# define LONGDOUBLE_TYPE long double
244#endif
245typedef sqlite_int64 i64; /* 8-byte signed integer */
246typedef sqlite_uint64 u64; /* 8-byte unsigned integer */
247typedef UINT32_TYPE u32; /* 4-byte unsigned integer */
248typedef UINT16_TYPE u16; /* 2-byte unsigned integer */
249typedef INT16_TYPE i16; /* 2-byte signed integer */
250typedef UINT8_TYPE u8; /* 1-byte unsigned integer */
251typedef UINT8_TYPE i8; /* 1-byte signed integer */
252
253/*
254** Macros to determine whether the machine is big or little endian,
255** evaluated at runtime.
256*/
257#ifdef SQLITE_AMALGAMATION
258const int sqlite3One;
259#else
260extern const int sqlite3one;
261#endif
262#if defined(i386) || defined(__i386__) || defined(_M_IX86)
263# define SQLITE_BIGENDIAN 0
264# define SQLITE_LITTLEENDIAN 1
265# define SQLITE_UTF16NATIVE SQLITE_UTF16LE
266#else
267# define SQLITE_BIGENDIAN (*(char *)(&sqlite3one)==0)
268# define SQLITE_LITTLEENDIAN (*(char *)(&sqlite3one)==1)
269# define SQLITE_UTF16NATIVE (SQLITE_BIGENDIAN?SQLITE_UTF16BE:SQLITE_UTF16LE)
270#endif
271
272/*
273** An instance of the following structure is used to store the busy-handler
274** callback for a given sqlite handle.
275**
276** The sqlite.busyHandler member of the sqlite struct contains the busy
277** callback for the database handle. Each pager opened via the sqlite
278** handle is passed a pointer to sqlite.busyHandler. The busy-handler
279** callback is currently invoked only from within pager.c.
280*/
281typedef struct BusyHandler BusyHandler;
282struct BusyHandler {
283 int (*xFunc)(void *,int); /* The busy callback */
284 void *pArg; /* First arg to busy callback */
285 int nBusy; /* Incremented with each busy call */
286};
287
288/*
289** Defer sourcing vdbe.h and btree.h until after the "u8" and
290** "BusyHandler typedefs.
291*/
292#include "btree.h"
293#include "vdbe.h"
294#include "pager.h"
295
296
297/*
298** Name of the master database table. The master database table
299** is a special table that holds the names and attributes of all
300** user tables and indices.
301*/
302#define MASTER_NAME "sqlite_master"
303#define TEMP_MASTER_NAME "sqlite_temp_master"
304
305/*
306** The root-page of the master database table.
307*/
308#define MASTER_ROOT 1
309
310/*
311** The name of the schema table.
312*/
313#define SCHEMA_TABLE(x) ((!OMIT_TEMPDB)&&(x==1)?TEMP_MASTER_NAME:MASTER_NAME)
314
315/*
316** A convenience macro that returns the number of elements in
317** an array.
318*/
319#define ArraySize(X) (sizeof(X)/sizeof(X[0]))
320
321/*
322** Forward references to structures
323*/
324typedef struct AggInfo AggInfo;
325typedef struct AuthContext AuthContext;
326typedef struct CollSeq CollSeq;
327typedef struct Column Column;
328typedef struct Db Db;
329typedef struct Schema Schema;
330typedef struct Expr Expr;
331typedef struct ExprList ExprList;
332typedef struct FKey FKey;
333typedef struct FuncDef FuncDef;
334typedef struct IdList IdList;
335typedef struct Index Index;
336typedef struct KeyClass KeyClass;
337typedef struct KeyInfo KeyInfo;
338typedef struct Module Module;
339typedef struct NameContext NameContext;
340typedef struct Parse Parse;
341typedef struct Select Select;
342typedef struct SrcList SrcList;
343typedef struct Table Table;
344typedef struct TableLock TableLock;
345typedef struct Token Token;
346typedef struct TriggerStack TriggerStack;
347typedef struct TriggerStep TriggerStep;
348typedef struct Trigger Trigger;
349typedef struct WhereInfo WhereInfo;
350typedef struct WhereLevel WhereLevel;
351
352#include "os.h"
353#include "mutex.h"
354
355/*
356** Each database file to be accessed by the system is an instance
357** of the following structure. There are normally two of these structures
358** in the sqlite.aDb[] array. aDb[0] is the main database file and
359** aDb[1] is the database file used to hold temporary tables. Additional
360** databases may be attached.
361*/
362struct Db {
363 char *zName; /* Name of this database */
364 Btree *pBt; /* The B*Tree structure for this database file */
365 u8 inTrans; /* 0: not writable. 1: Transaction. 2: Checkpoint */
366 u8 safety_level; /* How aggressive at synching data to disk */
367 void *pAux; /* Auxiliary data. Usually NULL */
368 void (*xFreeAux)(void*); /* Routine to free pAux */
369 Schema *pSchema; /* Pointer to database schema (possibly shared) */
370};
371
372/*
373** An instance of the following structure stores a database schema.
374**
375** If there are no virtual tables configured in this schema, the
376** Schema.db variable is set to NULL. After the first virtual table
377** has been added, it is set to point to the database connection
378** used to create the connection. Once a virtual table has been
379** added to the Schema structure and the Schema.db variable populated,
380** only that database connection may use the Schema to prepare
381** statements.
382*/
383struct Schema {
384 int schema_cookie; /* Database schema version number for this file */
385 Hash tblHash; /* All tables indexed by name */
386 Hash idxHash; /* All (named) indices indexed by name */
387 Hash trigHash; /* All triggers indexed by name */
388 Hash aFKey; /* Foreign keys indexed by to-table */
389 Table *pSeqTab; /* The sqlite_sequence table used by AUTOINCREMENT */
390 u8 file_format; /* Schema format version for this file */
391 u8 enc; /* Text encoding used by this database */
392 u16 flags; /* Flags associated with this schema */
393 int cache_size; /* Number of pages to use in the cache */
394#ifndef SQLITE_OMIT_VIRTUALTABLE
395 sqlite3 *db; /* "Owner" connection. See comment above */
396#endif
397};
398
399/*
400** These macros can be used to test, set, or clear bits in the
401** Db.flags field.
402*/
403#define DbHasProperty(D,I,P) (((D)->aDb[I].pSchema->flags&(P))==(P))
404#define DbHasAnyProperty(D,I,P) (((D)->aDb[I].pSchema->flags&(P))!=0)
405#define DbSetProperty(D,I,P) (D)->aDb[I].pSchema->flags|=(P)
406#define DbClearProperty(D,I,P) (D)->aDb[I].pSchema->flags&=~(P)
407
408/*
409** Allowed values for the DB.flags field.
410**
411** The DB_SchemaLoaded flag is set after the database schema has been
412** read into internal hash tables.
413**
414** DB_UnresetViews means that one or more views have column names that
415** have been filled out. If the schema changes, these column names might
416** changes and so the view will need to be reset.
417*/
418#define DB_SchemaLoaded 0x0001 /* The schema has been loaded */
419#define DB_UnresetViews 0x0002 /* Some views have defined column names */
420#define DB_Empty 0x0004 /* The file is empty (length 0 bytes) */
421
422
423/*
424** Each database is an instance of the following structure.
425**
426** The sqlite.lastRowid records the last insert rowid generated by an
427** insert statement. Inserts on views do not affect its value. Each
428** trigger has its own context, so that lastRowid can be updated inside
429** triggers as usual. The previous value will be restored once the trigger
430** exits. Upon entering a before or instead of trigger, lastRowid is no
431** longer (since after version 2.8.12) reset to -1.
432**
433** The sqlite.nChange does not count changes within triggers and keeps no
434** context. It is reset at start of sqlite3_exec.
435** The sqlite.lsChange represents the number of changes made by the last
436** insert, update, or delete statement. It remains constant throughout the
437** length of a statement and is then updated by OP_SetCounts. It keeps a
438** context stack just like lastRowid so that the count of changes
439** within a trigger is not seen outside the trigger. Changes to views do not
440** affect the value of lsChange.
441** The sqlite.csChange keeps track of the number of current changes (since
442** the last statement) and is used to update sqlite_lsChange.
443**
444** The member variables sqlite.errCode, sqlite.zErrMsg and sqlite.zErrMsg16
445** store the most recent error code and, if applicable, string. The
446** internal function sqlite3Error() is used to set these variables
447** consistently.
448*/
449struct sqlite3 {
450 sqlite3_vfs *pVfs; /* OS Interface */
451 int nDb; /* Number of backends currently in use */
452 Db *aDb; /* All backends */
453 int flags; /* Miscellanous flags. See below */
454 int openFlags; /* Flags passed to sqlite3_vfs.xOpen() */
455 int errCode; /* Most recent error code (SQLITE_*) */
456 int errMask; /* & result codes with this before returning */
457 u8 autoCommit; /* The auto-commit flag. */
458 u8 temp_store; /* 1: file 2: memory 0: default */
459 u8 mallocFailed; /* True if we have seen a malloc failure */
460 int nTable; /* Number of tables in the database */
461 CollSeq *pDfltColl; /* The default collating sequence (BINARY) */
462 i64 lastRowid; /* ROWID of most recent insert (see above) */
463 i64 priorNewRowid; /* Last randomly generated ROWID */
464 int magic; /* Magic number for detect library misuse */
465 int nChange; /* Value returned by sqlite3_changes() */
466 int nTotalChange; /* Value returned by sqlite3_total_changes() */
467 sqlite3_mutex *mutex; /* Connection mutex */
468 struct sqlite3InitInfo { /* Information used during initialization */
469 int iDb; /* When back is being initialized */
470 int newTnum; /* Rootpage of table being initialized */
471 u8 busy; /* TRUE if currently initializing */
472 } init;
473 int nExtension; /* Number of loaded extensions */
474 void **aExtension; /* Array of shared libraray handles */
475 struct Vdbe *pVdbe; /* List of active virtual machines */
476 int activeVdbeCnt; /* Number of vdbes currently executing */
477 void (*xTrace)(void*,const char*); /* Trace function */
478 void *pTraceArg; /* Argument to the trace function */
479 void (*xProfile)(void*,const char*,u64); /* Profiling function */
480 void *pProfileArg; /* Argument to profile function */
481 void *pCommitArg; /* Argument to xCommitCallback() */
482 int (*xCommitCallback)(void*); /* Invoked at every commit. */
483 void *pRollbackArg; /* Argument to xRollbackCallback() */
484 void (*xRollbackCallback)(void*); /* Invoked at every commit. */
485 void *pUpdateArg;
486 void (*xUpdateCallback)(void*,int, const char*,const char*,sqlite_int64);
487 void(*xCollNeeded)(void*,sqlite3*,int eTextRep,const char*);
488 void(*xCollNeeded16)(void*,sqlite3*,int eTextRep,const void*);
489 void *pCollNeededArg;
490 sqlite3_value *pErr; /* Most recent error message */
491 char *zErrMsg; /* Most recent error message (UTF-8 encoded) */
492 char *zErrMsg16; /* Most recent error message (UTF-16 encoded) */
493 union {
494 int isInterrupted; /* True if sqlite3_interrupt has been called */
495 double notUsed1; /* Spacer */
496 } u1;
497#ifndef SQLITE_OMIT_AUTHORIZATION
498 int (*xAuth)(void*,int,const char*,const char*,const char*,const char*);
499 /* Access authorization function */
500 void *pAuthArg; /* 1st argument to the access auth function */
501#endif
502#ifndef SQLITE_OMIT_PROGRESS_CALLBACK
503 int (*xProgress)(void *); /* The progress callback */
504 void *pProgressArg; /* Argument to the progress callback */
505 int nProgressOps; /* Number of opcodes for progress callback */
506#endif
507#ifndef SQLITE_OMIT_VIRTUALTABLE
508 Hash aModule; /* populated by sqlite3_create_module() */
509 Table *pVTab; /* vtab with active Connect/Create method */
510 sqlite3_vtab **aVTrans; /* Virtual tables with open transactions */
511 int nVTrans; /* Allocated size of aVTrans */
512#endif
513 Hash aFunc; /* All functions that can be in SQL exprs */
514 Hash aCollSeq; /* All collating sequences */
515 BusyHandler busyHandler; /* Busy callback */
516 int busyTimeout; /* Busy handler timeout, in msec */
517 Db aDbStatic[2]; /* Static space for the 2 default backends */
518#ifdef SQLITE_SSE
519 sqlite3_stmt *pFetch; /* Used by SSE to fetch stored statements */
520#endif
521 u8 dfltLockMode; /* Default locking-mode for attached dbs */
522};
523
524/*
525** A macro to discover the encoding of a database.
526*/
527#define ENC(db) ((db)->aDb[0].pSchema->enc)
528
529/*
530** Possible values for the sqlite.flags and or Db.flags fields.
531**
532** On sqlite.flags, the SQLITE_InTrans value means that we have
533** executed a BEGIN. On Db.flags, SQLITE_InTrans means a statement
534** transaction is active on that particular database file.
535*/
536#define SQLITE_VdbeTrace 0x00000001 /* True to trace VDBE execution */
537#define SQLITE_InTrans 0x00000008 /* True if in a transaction */
538#define SQLITE_InternChanges 0x00000010 /* Uncommitted Hash table changes */
539#define SQLITE_FullColNames 0x00000020 /* Show full column names on SELECT */
540#define SQLITE_ShortColNames 0x00000040 /* Show short columns names */
541#define SQLITE_CountRows 0x00000080 /* Count rows changed by INSERT, */
542 /* DELETE, or UPDATE and return */
543 /* the count using a callback. */
544#define SQLITE_NullCallback 0x00000100 /* Invoke the callback once if the */
545 /* result set is empty */
546#define SQLITE_SqlTrace 0x00000200 /* Debug print SQL as it executes */
547#define SQLITE_VdbeListing 0x00000400 /* Debug listings of VDBE programs */
548#define SQLITE_WriteSchema 0x00000800 /* OK to update SQLITE_MASTER */
549#define SQLITE_NoReadlock 0x00001000 /* Readlocks are omitted when
550 ** accessing read-only databases */
551#define SQLITE_IgnoreChecks 0x00002000 /* Do not enforce check constraints */
552#define SQLITE_ReadUncommitted 0x00004000 /* For shared-cache mode */
553#define SQLITE_LegacyFileFmt 0x00008000 /* Create new databases in format 1 */
554#define SQLITE_FullFSync 0x00010000 /* Use full fsync on the backend */
555#define SQLITE_LoadExtension 0x00020000 /* Enable load_extension */
556
557#define SQLITE_RecoveryMode 0x00040000 /* Ignore schema errors */
558#define SQLITE_SharedCache 0x00080000 /* Cache sharing is enabled */
559#define SQLITE_Vtab 0x00100000 /* There exists a virtual table */
560
561/*
562** Possible values for the sqlite.magic field.
563** The numbers are obtained at random and have no special meaning, other
564** than being distinct from one another.
565*/
566#define SQLITE_MAGIC_OPEN 0xa029a697 /* Database is open */
567#define SQLITE_MAGIC_CLOSED 0x9f3c2d33 /* Database is closed */
568#define SQLITE_MAGIC_BUSY 0xf03b7906 /* Database currently in use */
569#define SQLITE_MAGIC_ERROR 0xb5357930 /* An SQLITE_MISUSE error occurred */
570
571/*
572** Each SQL function is defined by an instance of the following
573** structure. A pointer to this structure is stored in the sqlite.aFunc
574** hash table. When multiple functions have the same name, the hash table
575** points to a linked list of these structures.
576*/
577struct FuncDef {
578 i16 nArg; /* Number of arguments. -1 means unlimited */
579 u8 iPrefEnc; /* Preferred text encoding (SQLITE_UTF8, 16LE, 16BE) */
580 u8 needCollSeq; /* True if sqlite3GetFuncCollSeq() might be called */
581 u8 flags; /* Some combination of SQLITE_FUNC_* */
582 void *pUserData; /* User data parameter */
583 FuncDef *pNext; /* Next function with same name */
584 void (*xFunc)(sqlite3_context*,int,sqlite3_value**); /* Regular function */
585 void (*xStep)(sqlite3_context*,int,sqlite3_value**); /* Aggregate step */
586 void (*xFinalize)(sqlite3_context*); /* Aggregate finializer */
587 char zName[1]; /* SQL name of the function. MUST BE LAST */
588};
589
590/*
591** Each SQLite module (virtual table definition) is defined by an
592** instance of the following structure, stored in the sqlite3.aModule
593** hash table.
594*/
595struct Module {
596 const sqlite3_module *pModule; /* Callback pointers */
597 const char *zName; /* Name passed to create_module() */
598 void *pAux; /* pAux passed to create_module() */
599 void (*xDestroy)(void *); /* Module destructor function */
600};
601
602/*
603** Possible values for FuncDef.flags
604*/
605#define SQLITE_FUNC_LIKE 0x01 /* Candidate for the LIKE optimization */
606#define SQLITE_FUNC_CASE 0x02 /* Case-sensitive LIKE-type function */
607#define SQLITE_FUNC_EPHEM 0x04 /* Ephermeral. Delete with VDBE */
608
609/*
610** information about each column of an SQL table is held in an instance
611** of this structure.
612*/
613struct Column {
614 char *zName; /* Name of this column */
615 Expr *pDflt; /* Default value of this column */
616 char *zType; /* Data type for this column */
617 char *zColl; /* Collating sequence. If NULL, use the default */
618 u8 notNull; /* True if there is a NOT NULL constraint */
619 u8 isPrimKey; /* True if this column is part of the PRIMARY KEY */
620 char affinity; /* One of the SQLITE_AFF_... values */
621#ifndef SQLITE_OMIT_VIRTUALTABLE
622 u8 isHidden; /* True if this column is 'hidden' */
623#endif
624};
625
626/*
627** A "Collating Sequence" is defined by an instance of the following
628** structure. Conceptually, a collating sequence consists of a name and
629** a comparison routine that defines the order of that sequence.
630**
631** There may two seperate implementations of the collation function, one
632** that processes text in UTF-8 encoding (CollSeq.xCmp) and another that
633** processes text encoded in UTF-16 (CollSeq.xCmp16), using the machine
634** native byte order. When a collation sequence is invoked, SQLite selects
635** the version that will require the least expensive encoding
636** translations, if any.
637**
638** The CollSeq.pUser member variable is an extra parameter that passed in
639** as the first argument to the UTF-8 comparison function, xCmp.
640** CollSeq.pUser16 is the equivalent for the UTF-16 comparison function,
641** xCmp16.
642**
643** If both CollSeq.xCmp and CollSeq.xCmp16 are NULL, it means that the
644** collating sequence is undefined. Indices built on an undefined
645** collating sequence may not be read or written.
646*/
647struct CollSeq {
648 char *zName; /* Name of the collating sequence, UTF-8 encoded */
649 u8 enc; /* Text encoding handled by xCmp() */
650 u8 type; /* One of the SQLITE_COLL_... values below */
651 void *pUser; /* First argument to xCmp() */
652 int (*xCmp)(void*,int, const void*, int, const void*);
653 void (*xDel)(void*); /* Destructor for pUser */
654};
655
656/*
657** Allowed values of CollSeq flags:
658*/
659#define SQLITE_COLL_BINARY 1 /* The default memcmp() collating sequence */
660#define SQLITE_COLL_NOCASE 2 /* The built-in NOCASE collating sequence */
661#define SQLITE_COLL_REVERSE 3 /* The built-in REVERSE collating sequence */
662#define SQLITE_COLL_USER 0 /* Any other user-defined collating sequence */
663
664/*
665** A sort order can be either ASC or DESC.
666*/
667#define SQLITE_SO_ASC 0 /* Sort in ascending order */
668#define SQLITE_SO_DESC 1 /* Sort in ascending order */
669
670/*
671** Column affinity types.
672**
673** These used to have mnemonic name like 'i' for SQLITE_AFF_INTEGER and
674** 't' for SQLITE_AFF_TEXT. But we can save a little space and improve
675** the speed a little by number the values consecutively.
676**
677** But rather than start with 0 or 1, we begin with 'a'. That way,
678** when multiple affinity types are concatenated into a string and
679** used as the P3 operand, they will be more readable.
680**
681** Note also that the numeric types are grouped together so that testing
682** for a numeric type is a single comparison.
683*/
684#define SQLITE_AFF_TEXT 'a'
685#define SQLITE_AFF_NONE 'b'
686#define SQLITE_AFF_NUMERIC 'c'
687#define SQLITE_AFF_INTEGER 'd'
688#define SQLITE_AFF_REAL 'e'
689
690#define sqlite3IsNumericAffinity(X) ((X)>=SQLITE_AFF_NUMERIC)
691
692/*
693** Each SQL table is represented in memory by an instance of the
694** following structure.
695**
696** Table.zName is the name of the table. The case of the original
697** CREATE TABLE statement is stored, but case is not significant for
698** comparisons.
699**
700** Table.nCol is the number of columns in this table. Table.aCol is a
701** pointer to an array of Column structures, one for each column.
702**
703** If the table has an INTEGER PRIMARY KEY, then Table.iPKey is the index of
704** the column that is that key. Otherwise Table.iPKey is negative. Note
705** that the datatype of the PRIMARY KEY must be INTEGER for this field to
706** be set. An INTEGER PRIMARY KEY is used as the rowid for each row of
707** the table. If a table has no INTEGER PRIMARY KEY, then a random rowid
708** is generated for each row of the table. Table.hasPrimKey is true if
709** the table has any PRIMARY KEY, INTEGER or otherwise.
710**
711** Table.tnum is the page number for the root BTree page of the table in the
712** database file. If Table.iDb is the index of the database table backend
713** in sqlite.aDb[]. 0 is for the main database and 1 is for the file that
714** holds temporary tables and indices. If Table.isEphem
715** is true, then the table is stored in a file that is automatically deleted
716** when the VDBE cursor to the table is closed. In this case Table.tnum
717** refers VDBE cursor number that holds the table open, not to the root
718** page number. Transient tables are used to hold the results of a
719** sub-query that appears instead of a real table name in the FROM clause
720** of a SELECT statement.
721*/
722struct Table {
723 char *zName; /* Name of the table */
724 int nCol; /* Number of columns in this table */
725 Column *aCol; /* Information about each column */
726 int iPKey; /* If not less then 0, use aCol[iPKey] as the primary key */
727 Index *pIndex; /* List of SQL indexes on this table. */
728 int tnum; /* Root BTree node for this table (see note above) */
729 Select *pSelect; /* NULL for tables. Points to definition if a view. */
730 int nRef; /* Number of pointers to this Table */
731 Trigger *pTrigger; /* List of SQL triggers on this table */
732 FKey *pFKey; /* Linked list of all foreign keys in this table */
733 char *zColAff; /* String defining the affinity of each column */
734#ifndef SQLITE_OMIT_CHECK
735 Expr *pCheck; /* The AND of all CHECK constraints */
736#endif
737#ifndef SQLITE_OMIT_ALTERTABLE
738 int addColOffset; /* Offset in CREATE TABLE statement to add a new column */
739#endif
740 u8 readOnly; /* True if this table should not be written by the user */
741 u8 isEphem; /* True if created using OP_OpenEphermeral */
742 u8 hasPrimKey; /* True if there exists a primary key */
743 u8 keyConf; /* What to do in case of uniqueness conflict on iPKey */
744 u8 autoInc; /* True if the integer primary key is autoincrement */
745#ifndef SQLITE_OMIT_VIRTUALTABLE
746 u8 isVirtual; /* True if this is a virtual table */
747 u8 isCommit; /* True once the CREATE TABLE has been committed */
748 Module *pMod; /* Pointer to the implementation of the module */
749 sqlite3_vtab *pVtab; /* Pointer to the module instance */
750 int nModuleArg; /* Number of arguments to the module */
751 char **azModuleArg; /* Text of all module args. [0] is module name */
752#endif
753 Schema *pSchema; /* Schema that contains this table */
754};
755
756/*
757** Test to see whether or not a table is a virtual table. This is
758** done as a macro so that it will be optimized out when virtual
759** table support is omitted from the build.
760*/
761#ifndef SQLITE_OMIT_VIRTUALTABLE
762# define IsVirtual(X) ((X)->isVirtual)
763# define IsHiddenColumn(X) ((X)->isHidden)
764#else
765# define IsVirtual(X) 0
766# define IsHiddenColumn(X) 0
767#endif
768
769/*
770** Each foreign key constraint is an instance of the following structure.
771**
772** A foreign key is associated with two tables. The "from" table is
773** the table that contains the REFERENCES clause that creates the foreign
774** key. The "to" table is the table that is named in the REFERENCES clause.
775** Consider this example:
776**
777** CREATE TABLE ex1(
778** a INTEGER PRIMARY KEY,
779** b INTEGER CONSTRAINT fk1 REFERENCES ex2(x)
780** );
781**
782** For foreign key "fk1", the from-table is "ex1" and the to-table is "ex2".
783**
784** Each REFERENCES clause generates an instance of the following structure
785** which is attached to the from-table. The to-table need not exist when
786** the from-table is created. The existance of the to-table is not checked
787** until an attempt is made to insert data into the from-table.
788**
789** The sqlite.aFKey hash table stores pointers to this structure
790** given the name of a to-table. For each to-table, all foreign keys
791** associated with that table are on a linked list using the FKey.pNextTo
792** field.
793*/
794struct FKey {
795 Table *pFrom; /* The table that constains the REFERENCES clause */
796 FKey *pNextFrom; /* Next foreign key in pFrom */
797 char *zTo; /* Name of table that the key points to */
798 FKey *pNextTo; /* Next foreign key that points to zTo */
799 int nCol; /* Number of columns in this key */
800 struct sColMap { /* Mapping of columns in pFrom to columns in zTo */
801 int iFrom; /* Index of column in pFrom */
802 char *zCol; /* Name of column in zTo. If 0 use PRIMARY KEY */
803 } *aCol; /* One entry for each of nCol column s */
804 u8 isDeferred; /* True if constraint checking is deferred till COMMIT */
805 u8 updateConf; /* How to resolve conflicts that occur on UPDATE */
806 u8 deleteConf; /* How to resolve conflicts that occur on DELETE */
807 u8 insertConf; /* How to resolve conflicts that occur on INSERT */
808};
809
810/*
811** SQLite supports many different ways to resolve a constraint
812** error. ROLLBACK processing means that a constraint violation
813** causes the operation in process to fail and for the current transaction
814** to be rolled back. ABORT processing means the operation in process
815** fails and any prior changes from that one operation are backed out,
816** but the transaction is not rolled back. FAIL processing means that
817** the operation in progress stops and returns an error code. But prior
818** changes due to the same operation are not backed out and no rollback
819** occurs. IGNORE means that the particular row that caused the constraint
820** error is not inserted or updated. Processing continues and no error
821** is returned. REPLACE means that preexisting database rows that caused
822** a UNIQUE constraint violation are removed so that the new insert or
823** update can proceed. Processing continues and no error is reported.
824**
825** RESTRICT, SETNULL, and CASCADE actions apply only to foreign keys.
826** RESTRICT is the same as ABORT for IMMEDIATE foreign keys and the
827** same as ROLLBACK for DEFERRED keys. SETNULL means that the foreign
828** key is set to NULL. CASCADE means that a DELETE or UPDATE of the
829** referenced table row is propagated into the row that holds the
830** foreign key.
831**
832** The following symbolic values are used to record which type
833** of action to take.
834*/
835#define OE_None 0 /* There is no constraint to check */
836#define OE_Rollback 1 /* Fail the operation and rollback the transaction */
837#define OE_Abort 2 /* Back out changes but do no rollback transaction */
838#define OE_Fail 3 /* Stop the operation but leave all prior changes */
839#define OE_Ignore 4 /* Ignore the error. Do not do the INSERT or UPDATE */
840#define OE_Replace 5 /* Delete existing record, then do INSERT or UPDATE */
841
842#define OE_Restrict 6 /* OE_Abort for IMMEDIATE, OE_Rollback for DEFERRED */
843#define OE_SetNull 7 /* Set the foreign key value to NULL */
844#define OE_SetDflt 8 /* Set the foreign key value to its default */
845#define OE_Cascade 9 /* Cascade the changes */
846
847#define OE_Default 99 /* Do whatever the default action is */
848
849
850/*
851** An instance of the following structure is passed as the first
852** argument to sqlite3VdbeKeyCompare and is used to control the
853** comparison of the two index keys.
854**
855** If the KeyInfo.incrKey value is true and the comparison would
856** otherwise be equal, then return a result as if the second key
857** were larger.
858*/
859struct KeyInfo {
860 sqlite3 *db; /* The database connection */
861 u8 enc; /* Text encoding - one of the TEXT_Utf* values */
862 u8 incrKey; /* Increase 2nd key by epsilon before comparison */
863 int nField; /* Number of entries in aColl[] */
864 u8 *aSortOrder; /* If defined an aSortOrder[i] is true, sort DESC */
865 CollSeq *aColl[1]; /* Collating sequence for each term of the key */
866};
867
868/*
869** Each SQL index is represented in memory by an
870** instance of the following structure.
871**
872** The columns of the table that are to be indexed are described
873** by the aiColumn[] field of this structure. For example, suppose
874** we have the following table and index:
875**
876** CREATE TABLE Ex1(c1 int, c2 int, c3 text);
877** CREATE INDEX Ex2 ON Ex1(c3,c1);
878**
879** In the Table structure describing Ex1, nCol==3 because there are
880** three columns in the table. In the Index structure describing
881** Ex2, nColumn==2 since 2 of the 3 columns of Ex1 are indexed.
882** The value of aiColumn is {2, 0}. aiColumn[0]==2 because the
883** first column to be indexed (c3) has an index of 2 in Ex1.aCol[].
884** The second column to be indexed (c1) has an index of 0 in
885** Ex1.aCol[], hence Ex2.aiColumn[1]==0.
886**
887** The Index.onError field determines whether or not the indexed columns
888** must be unique and what to do if they are not. When Index.onError=OE_None,
889** it means this is not a unique index. Otherwise it is a unique index
890** and the value of Index.onError indicate the which conflict resolution
891** algorithm to employ whenever an attempt is made to insert a non-unique
892** element.
893*/
894struct Index {
895 char *zName; /* Name of this index */
896 int nColumn; /* Number of columns in the table used by this index */
897 int *aiColumn; /* Which columns are used by this index. 1st is 0 */
898 unsigned *aiRowEst; /* Result of ANALYZE: Est. rows selected by each column */
899 Table *pTable; /* The SQL table being indexed */
900 int tnum; /* Page containing root of this index in database file */
901 u8 onError; /* OE_Abort, OE_Ignore, OE_Replace, or OE_None */
902 u8 autoIndex; /* True if is automatically created (ex: by UNIQUE) */
903 char *zColAff; /* String defining the affinity of each column */
904 Index *pNext; /* The next index associated with the same table */
905 Schema *pSchema; /* Schema containing this index */
906 u8 *aSortOrder; /* Array of size Index.nColumn. True==DESC, False==ASC */
907 char **azColl; /* Array of collation sequence names for index */
908};
909
910/*
911** Each token coming out of the lexer is an instance of
912** this structure. Tokens are also used as part of an expression.
913**
914** Note if Token.z==0 then Token.dyn and Token.n are undefined and
915** may contain random values. Do not make any assuptions about Token.dyn
916** and Token.n when Token.z==0.
917*/
918struct Token {
919 const unsigned char *z; /* Text of the token. Not NULL-terminated! */
920 unsigned dyn : 1; /* True for malloced memory, false for static */
921 unsigned n : 31; /* Number of characters in this token */
922};
923
924/*
925** An instance of this structure contains information needed to generate
926** code for a SELECT that contains aggregate functions.
927**
928** If Expr.op==TK_AGG_COLUMN or TK_AGG_FUNCTION then Expr.pAggInfo is a
929** pointer to this structure. The Expr.iColumn field is the index in
930** AggInfo.aCol[] or AggInfo.aFunc[] of information needed to generate
931** code for that node.
932**
933** AggInfo.pGroupBy and AggInfo.aFunc.pExpr point to fields within the
934** original Select structure that describes the SELECT statement. These
935** fields do not need to be freed when deallocating the AggInfo structure.
936*/
937struct AggInfo {
938 u8 directMode; /* Direct rendering mode means take data directly
939 ** from source tables rather than from accumulators */
940 u8 useSortingIdx; /* In direct mode, reference the sorting index rather
941 ** than the source table */
942 int sortingIdx; /* Cursor number of the sorting index */
943 ExprList *pGroupBy; /* The group by clause */
944 int nSortingColumn; /* Number of columns in the sorting index */
945 struct AggInfo_col { /* For each column used in source tables */
946 Table *pTab; /* Source table */
947 int iTable; /* Cursor number of the source table */
948 int iColumn; /* Column number within the source table */
949 int iSorterColumn; /* Column number in the sorting index */
950 int iMem; /* Memory location that acts as accumulator */
951 Expr *pExpr; /* The original expression */
952 } *aCol;
953 int nColumn; /* Number of used entries in aCol[] */
954 int nColumnAlloc; /* Number of slots allocated for aCol[] */
955 int nAccumulator; /* Number of columns that show through to the output.
956 ** Additional columns are used only as parameters to
957 ** aggregate functions */
958 struct AggInfo_func { /* For each aggregate function */
959 Expr *pExpr; /* Expression encoding the function */
960 FuncDef *pFunc; /* The aggregate function implementation */
961 int iMem; /* Memory location that acts as accumulator */
962 int iDistinct; /* Ephermeral table used to enforce DISTINCT */
963 } *aFunc;
964 int nFunc; /* Number of entries in aFunc[] */
965 int nFuncAlloc; /* Number of slots allocated for aFunc[] */
966};
967
968/*
969** Each node of an expression in the parse tree is an instance
970** of this structure.
971**
972** Expr.op is the opcode. The integer parser token codes are reused
973** as opcodes here. For example, the parser defines TK_GE to be an integer
974** code representing the ">=" operator. This same integer code is reused
975** to represent the greater-than-or-equal-to operator in the expression
976** tree.
977**
978** Expr.pRight and Expr.pLeft are subexpressions. Expr.pList is a list
979** of argument if the expression is a function.
980**
981** Expr.token is the operator token for this node. For some expressions
982** that have subexpressions, Expr.token can be the complete text that gave
983** rise to the Expr. In the latter case, the token is marked as being
984** a compound token.
985**
986** An expression of the form ID or ID.ID refers to a column in a table.
987** For such expressions, Expr.op is set to TK_COLUMN and Expr.iTable is
988** the integer cursor number of a VDBE cursor pointing to that table and
989** Expr.iColumn is the column number for the specific column. If the
990** expression is used as a result in an aggregate SELECT, then the
991** value is also stored in the Expr.iAgg column in the aggregate so that
992** it can be accessed after all aggregates are computed.
993**
994** If the expression is a function, the Expr.iTable is an integer code
995** representing which function. If the expression is an unbound variable
996** marker (a question mark character '?' in the original SQL) then the
997** Expr.iTable holds the index number for that variable.
998**
999** If the expression is a subquery then Expr.iColumn holds an integer
1000** register number containing the result of the subquery. If the
1001** subquery gives a constant result, then iTable is -1. If the subquery
1002** gives a different answer at different times during statement processing
1003** then iTable is the address of a subroutine that computes the subquery.
1004**
1005** The Expr.pSelect field points to a SELECT statement. The SELECT might
1006** be the right operand of an IN operator. Or, if a scalar SELECT appears
1007** in an expression the opcode is TK_SELECT and Expr.pSelect is the only
1008** operand.
1009**
1010** If the Expr is of type OP_Column, and the table it is selecting from
1011** is a disk table or the "old.*" pseudo-table, then pTab points to the
1012** corresponding table definition.
1013*/
1014struct Expr {
1015 u8 op; /* Operation performed by this node */
1016 char affinity; /* The affinity of the column or 0 if not a column */
1017 u16 flags; /* Various flags. See below */
1018 CollSeq *pColl; /* The collation type of the column or 0 */
1019 Expr *pLeft, *pRight; /* Left and right subnodes */
1020 ExprList *pList; /* A list of expressions used as function arguments
1021 ** or in "<expr> IN (<expr-list)" */
1022 Token token; /* An operand token */
1023 Token span; /* Complete text of the expression */
1024 int iTable, iColumn; /* When op==TK_COLUMN, then this expr node means the
1025 ** iColumn-th field of the iTable-th table. */
1026 AggInfo *pAggInfo; /* Used by TK_AGG_COLUMN and TK_AGG_FUNCTION */
1027 int iAgg; /* Which entry in pAggInfo->aCol[] or ->aFunc[] */
1028 int iRightJoinTable; /* If EP_FromJoin, the right table of the join */
1029 Select *pSelect; /* When the expression is a sub-select. Also the
1030 ** right side of "<expr> IN (<select>)" */
1031 Table *pTab; /* Table for OP_Column expressions. */
1032/* Schema *pSchema; */
1033#if defined(SQLITE_TEST) || SQLITE_MAX_EXPR_DEPTH>0
1034 int nHeight; /* Height of the tree headed by this node */
1035#endif
1036};
1037
1038/*
1039** The following are the meanings of bits in the Expr.flags field.
1040*/
1041#define EP_FromJoin 0x01 /* Originated in ON or USING clause of a join */
1042#define EP_Agg 0x02 /* Contains one or more aggregate functions */
1043#define EP_Resolved 0x04 /* IDs have been resolved to COLUMNs */
1044#define EP_Error 0x08 /* Expression contains one or more errors */
1045#define EP_Distinct 0x10 /* Aggregate function with DISTINCT keyword */
1046#define EP_VarSelect 0x20 /* pSelect is correlated, not constant */
1047#define EP_Dequoted 0x40 /* True if the string has been dequoted */
1048#define EP_InfixFunc 0x80 /* True for an infix function: LIKE, GLOB, etc */
1049#define EP_ExpCollate 0x100 /* Collating sequence specified explicitly */
1050
1051/*
1052** These macros can be used to test, set, or clear bits in the
1053** Expr.flags field.
1054*/
1055#define ExprHasProperty(E,P) (((E)->flags&(P))==(P))
1056#define ExprHasAnyProperty(E,P) (((E)->flags&(P))!=0)
1057#define ExprSetProperty(E,P) (E)->flags|=(P)
1058#define ExprClearProperty(E,P) (E)->flags&=~(P)
1059
1060/*
1061** A list of expressions. Each expression may optionally have a
1062** name. An expr/name combination can be used in several ways, such
1063** as the list of "expr AS ID" fields following a "SELECT" or in the
1064** list of "ID = expr" items in an UPDATE. A list of expressions can
1065** also be used as the argument to a function, in which case the a.zName
1066** field is not used.
1067*/
1068struct ExprList {
1069 int nExpr; /* Number of expressions on the list */
1070 int nAlloc; /* Number of entries allocated below */
1071 int iECursor; /* VDBE Cursor associated with this ExprList */
1072 struct ExprList_item {
1073 Expr *pExpr; /* The list of expressions */
1074 char *zName; /* Token associated with this expression */
1075 u8 sortOrder; /* 1 for DESC or 0 for ASC */
1076 u8 isAgg; /* True if this is an aggregate like count(*) */
1077 u8 done; /* A flag to indicate when processing is finished */
1078 } *a; /* One entry for each expression */
1079};
1080
1081/*
1082** An instance of this structure can hold a simple list of identifiers,
1083** such as the list "a,b,c" in the following statements:
1084**
1085** INSERT INTO t(a,b,c) VALUES ...;
1086** CREATE INDEX idx ON t(a,b,c);
1087** CREATE TRIGGER trig BEFORE UPDATE ON t(a,b,c) ...;
1088**
1089** The IdList.a.idx field is used when the IdList represents the list of
1090** column names after a table name in an INSERT statement. In the statement
1091**
1092** INSERT INTO t(a,b,c) ...
1093**
1094** If "a" is the k-th column of table "t", then IdList.a[0].idx==k.
1095*/
1096struct IdList {
1097 struct IdList_item {
1098 char *zName; /* Name of the identifier */
1099 int idx; /* Index in some Table.aCol[] of a column named zName */
1100 } *a;
1101 int nId; /* Number of identifiers on the list */
1102 int nAlloc; /* Number of entries allocated for a[] below */
1103};
1104
1105/*
1106** The bitmask datatype defined below is used for various optimizations.
1107**
1108** Changing this from a 64-bit to a 32-bit type limits the number of
1109** tables in a join to 32 instead of 64. But it also reduces the size
1110** of the library by 738 bytes on ix86.
1111*/
1112typedef u64 Bitmask;
1113
1114/*
1115** The following structure describes the FROM clause of a SELECT statement.
1116** Each table or subquery in the FROM clause is a separate element of
1117** the SrcList.a[] array.
1118**
1119** With the addition of multiple database support, the following structure
1120** can also be used to describe a particular table such as the table that
1121** is modified by an INSERT, DELETE, or UPDATE statement. In standard SQL,
1122** such a table must be a simple name: ID. But in SQLite, the table can
1123** now be identified by a database name, a dot, then the table name: ID.ID.
1124**
1125** The jointype starts out showing the join type between the current table
1126** and the next table on the list. The parser builds the list this way.
1127** But sqlite3SrcListShiftJoinType() later shifts the jointypes so that each
1128** jointype expresses the join between the table and the previous table.
1129*/
1130struct SrcList {
1131 i16 nSrc; /* Number of tables or subqueries in the FROM clause */
1132 i16 nAlloc; /* Number of entries allocated in a[] below */
1133 struct SrcList_item {
1134 char *zDatabase; /* Name of database holding this table */
1135 char *zName; /* Name of the table */
1136 char *zAlias; /* The "B" part of a "A AS B" phrase. zName is the "A" */
1137 Table *pTab; /* An SQL table corresponding to zName */
1138 Select *pSelect; /* A SELECT statement used in place of a table name */
1139 u8 isPopulated; /* Temporary table associated with SELECT is populated */
1140 u8 jointype; /* Type of join between this able and the previous */
1141 int iCursor; /* The VDBE cursor number used to access this table */
1142 Expr *pOn; /* The ON clause of a join */
1143 IdList *pUsing; /* The USING clause of a join */
1144 Bitmask colUsed; /* Bit N (1<<N) set if column N or pTab is used */
1145 } a[1]; /* One entry for each identifier on the list */
1146};
1147
1148/*
1149** Permitted values of the SrcList.a.jointype field
1150*/
1151#define JT_INNER 0x0001 /* Any kind of inner or cross join */
1152#define JT_CROSS 0x0002 /* Explicit use of the CROSS keyword */
1153#define JT_NATURAL 0x0004 /* True for a "natural" join */
1154#define JT_LEFT 0x0008 /* Left outer join */
1155#define JT_RIGHT 0x0010 /* Right outer join */
1156#define JT_OUTER 0x0020 /* The "OUTER" keyword is present */
1157#define JT_ERROR 0x0040 /* unknown or unsupported join type */
1158
1159/*
1160** For each nested loop in a WHERE clause implementation, the WhereInfo
1161** structure contains a single instance of this structure. This structure
1162** is intended to be private the the where.c module and should not be
1163** access or modified by other modules.
1164**
1165** The pIdxInfo and pBestIdx fields are used to help pick the best
1166** index on a virtual table. The pIdxInfo pointer contains indexing
1167** information for the i-th table in the FROM clause before reordering.
1168** All the pIdxInfo pointers are freed by whereInfoFree() in where.c.
1169** The pBestIdx pointer is a copy of pIdxInfo for the i-th table after
1170** FROM clause ordering. This is a little confusing so I will repeat
1171** it in different words. WhereInfo.a[i].pIdxInfo is index information
1172** for WhereInfo.pTabList.a[i]. WhereInfo.a[i].pBestInfo is the
1173** index information for the i-th loop of the join. pBestInfo is always
1174** either NULL or a copy of some pIdxInfo. So for cleanup it is
1175** sufficient to free all of the pIdxInfo pointers.
1176**
1177*/
1178struct WhereLevel {
1179 int iFrom; /* Which entry in the FROM clause */
1180 int flags; /* Flags associated with this level */
1181 int iMem; /* First memory cell used by this level */
1182 int iLeftJoin; /* Memory cell used to implement LEFT OUTER JOIN */
1183 Index *pIdx; /* Index used. NULL if no index */
1184 int iTabCur; /* The VDBE cursor used to access the table */
1185 int iIdxCur; /* The VDBE cursor used to acesss pIdx */
1186 int brk; /* Jump here to break out of the loop */
1187 int nxt; /* Jump here to start the next IN combination */
1188 int cont; /* Jump here to continue with the next loop cycle */
1189 int top; /* First instruction of interior of the loop */
1190 int op, p1, p2; /* Opcode used to terminate the loop */
1191 int nEq; /* Number of == or IN constraints on this loop */
1192 int nIn; /* Number of IN operators constraining this loop */
1193 struct InLoop {
1194 int iCur; /* The VDBE cursor used by this IN operator */
1195 int topAddr; /* Top of the IN loop */
1196 } *aInLoop; /* Information about each nested IN operator */
1197 sqlite3_index_info *pBestIdx; /* Index information for this level */
1198
1199 /* The following field is really not part of the current level. But
1200 ** we need a place to cache index information for each table in the
1201 ** FROM clause and the WhereLevel structure is a convenient place.
1202 */
1203 sqlite3_index_info *pIdxInfo; /* Index info for n-th source table */
1204};
1205
1206/*
1207** The WHERE clause processing routine has two halves. The
1208** first part does the start of the WHERE loop and the second
1209** half does the tail of the WHERE loop. An instance of
1210** this structure is returned by the first half and passed
1211** into the second half to give some continuity.
1212*/
1213struct WhereInfo {
1214 Parse *pParse;
1215 SrcList *pTabList; /* List of tables in the join */
1216 int iTop; /* The very beginning of the WHERE loop */
1217 int iContinue; /* Jump here to continue with next record */
1218 int iBreak; /* Jump here to break out of the loop */
1219 int nLevel; /* Number of nested loop */
1220 sqlite3_index_info **apInfo; /* Array of pointers to index info structures */
1221 WhereLevel a[1]; /* Information about each nest loop in the WHERE */
1222};
1223
1224/*
1225** A NameContext defines a context in which to resolve table and column
1226** names. The context consists of a list of tables (the pSrcList) field and
1227** a list of named expression (pEList). The named expression list may
1228** be NULL. The pSrc corresponds to the FROM clause of a SELECT or
1229** to the table being operated on by INSERT, UPDATE, or DELETE. The
1230** pEList corresponds to the result set of a SELECT and is NULL for
1231** other statements.
1232**
1233** NameContexts can be nested. When resolving names, the inner-most
1234** context is searched first. If no match is found, the next outer
1235** context is checked. If there is still no match, the next context
1236** is checked. This process continues until either a match is found
1237** or all contexts are check. When a match is found, the nRef member of
1238** the context containing the match is incremented.
1239**
1240** Each subquery gets a new NameContext. The pNext field points to the
1241** NameContext in the parent query. Thus the process of scanning the
1242** NameContext list corresponds to searching through successively outer
1243** subqueries looking for a match.
1244*/
1245struct NameContext {
1246 Parse *pParse; /* The parser */
1247 SrcList *pSrcList; /* One or more tables used to resolve names */
1248 ExprList *pEList; /* Optional list of named expressions */
1249 int nRef; /* Number of names resolved by this context */
1250 int nErr; /* Number of errors encountered while resolving names */
1251 u8 allowAgg; /* Aggregate functions allowed here */
1252 u8 hasAgg; /* True if aggregates are seen */
1253 u8 isCheck; /* True if resolving names in a CHECK constraint */
1254 int nDepth; /* Depth of subquery recursion. 1 for no recursion */
1255 AggInfo *pAggInfo; /* Information about aggregates at this level */
1256 NameContext *pNext; /* Next outer name context. NULL for outermost */
1257};
1258
1259/*
1260** An instance of the following structure contains all information
1261** needed to generate code for a single SELECT statement.
1262**
1263** nLimit is set to -1 if there is no LIMIT clause. nOffset is set to 0.
1264** If there is a LIMIT clause, the parser sets nLimit to the value of the
1265** limit and nOffset to the value of the offset (or 0 if there is not
1266** offset). But later on, nLimit and nOffset become the memory locations
1267** in the VDBE that record the limit and offset counters.
1268**
1269** addrOpenEphm[] entries contain the address of OP_OpenEphemeral opcodes.
1270** These addresses must be stored so that we can go back and fill in
1271** the P3_KEYINFO and P2 parameters later. Neither the KeyInfo nor
1272** the number of columns in P2 can be computed at the same time
1273** as the OP_OpenEphm instruction is coded because not
1274** enough information about the compound query is known at that point.
1275** The KeyInfo for addrOpenTran[0] and [1] contains collating sequences
1276** for the result set. The KeyInfo for addrOpenTran[2] contains collating
1277** sequences for the ORDER BY clause.
1278*/
1279struct Select {
1280 ExprList *pEList; /* The fields of the result */
1281 u8 op; /* One of: TK_UNION TK_ALL TK_INTERSECT TK_EXCEPT */
1282 u8 isDistinct; /* True if the DISTINCT keyword is present */
1283 u8 isResolved; /* True once sqlite3SelectResolve() has run. */
1284 u8 isAgg; /* True if this is an aggregate query */
1285 u8 usesEphm; /* True if uses an OpenEphemeral opcode */
1286 u8 disallowOrderBy; /* Do not allow an ORDER BY to be attached if TRUE */
1287 char affinity; /* MakeRecord with this affinity for SRT_Set */
1288 SrcList *pSrc; /* The FROM clause */
1289 Expr *pWhere; /* The WHERE clause */
1290 ExprList *pGroupBy; /* The GROUP BY clause */
1291 Expr *pHaving; /* The HAVING clause */
1292 ExprList *pOrderBy; /* The ORDER BY clause */
1293 Select *pPrior; /* Prior select in a compound select statement */
1294 Select *pRightmost; /* Right-most select in a compound select statement */
1295 Expr *pLimit; /* LIMIT expression. NULL means not used. */
1296 Expr *pOffset; /* OFFSET expression. NULL means not used. */
1297 int iLimit, iOffset; /* Memory registers holding LIMIT & OFFSET counters */
1298 int addrOpenEphm[3]; /* OP_OpenEphem opcodes related to this select */
1299};
1300
1301/*
1302** The results of a select can be distributed in several ways.
1303*/
1304#define SRT_Union 1 /* Store result as keys in an index */
1305#define SRT_Except 2 /* Remove result from a UNION index */
1306#define SRT_Discard 3 /* Do not save the results anywhere */
1307
1308/* The ORDER BY clause is ignored for all of the above */
1309#define IgnorableOrderby(X) (X<=SRT_Discard)
1310
1311#define SRT_Callback 4 /* Invoke a callback with each row of result */
1312#define SRT_Mem 5 /* Store result in a memory cell */
1313#define SRT_Set 6 /* Store non-null results as keys in an index */
1314#define SRT_Table 7 /* Store result as data with an automatic rowid */
1315#define SRT_EphemTab 8 /* Create transient tab and store like SRT_Table */
1316#define SRT_Subroutine 9 /* Call a subroutine to handle results */
1317#define SRT_Exists 10 /* Store 1 if the result is not empty */
1318
1319/*
1320** An SQL parser context. A copy of this structure is passed through
1321** the parser and down into all the parser action routine in order to
1322** carry around information that is global to the entire parse.
1323**
1324** The structure is divided into two parts. When the parser and code
1325** generate call themselves recursively, the first part of the structure
1326** is constant but the second part is reset at the beginning and end of
1327** each recursion.
1328**
1329** The nTableLock and aTableLock variables are only used if the shared-cache
1330** feature is enabled (if sqlite3Tsd()->useSharedData is true). They are
1331** used to store the set of table-locks required by the statement being
1332** compiled. Function sqlite3TableLock() is used to add entries to the
1333** list.
1334*/
1335struct Parse {
1336 sqlite3 *db; /* The main database structure */
1337 int rc; /* Return code from execution */
1338 char *zErrMsg; /* An error message */
1339 Vdbe *pVdbe; /* An engine for executing database bytecode */
1340 u8 colNamesSet; /* TRUE after OP_ColumnName has been issued to pVdbe */
1341 u8 nameClash; /* A permanent table name clashes with temp table name */
1342 u8 checkSchema; /* Causes schema cookie check after an error */
1343 u8 nested; /* Number of nested calls to the parser/code generator */
1344 u8 parseError; /* True after a parsing error. Ticket #1794 */
1345 int nErr; /* Number of errors seen */
1346 int nTab; /* Number of previously allocated VDBE cursors */
1347 int nMem; /* Number of memory cells used so far */
1348 int nSet; /* Number of sets used so far */
1349 int ckOffset; /* Stack offset to data used by CHECK constraints */
1350 u32 writeMask; /* Start a write transaction on these databases */
1351 u32 cookieMask; /* Bitmask of schema verified databases */
1352 int cookieGoto; /* Address of OP_Goto to cookie verifier subroutine */
1353 int cookieValue[SQLITE_MAX_ATTACHED+2]; /* Values of cookies to verify */
1354#ifndef SQLITE_OMIT_SHARED_CACHE
1355 int nTableLock; /* Number of locks in aTableLock */
1356 TableLock *aTableLock; /* Required table locks for shared-cache mode */
1357#endif
1358
1359 /* Above is constant between recursions. Below is reset before and after
1360 ** each recursion */
1361
1362 int nVar; /* Number of '?' variables seen in the SQL so far */
1363 int nVarExpr; /* Number of used slots in apVarExpr[] */
1364 int nVarExprAlloc; /* Number of allocated slots in apVarExpr[] */
1365 Expr **apVarExpr; /* Pointers to :aaa and $aaaa wildcard expressions */
1366 u8 explain; /* True if the EXPLAIN flag is found on the query */
1367 Token sErrToken; /* The token at which the error occurred */
1368 Token sNameToken; /* Token with unqualified schema object name */
1369 Token sLastToken; /* The last token parsed */
1370 const char *zSql; /* All SQL text */
1371 const char *zTail; /* All SQL text past the last semicolon parsed */
1372 Table *pNewTable; /* A table being constructed by CREATE TABLE */
1373 Trigger *pNewTrigger; /* Trigger under construct by a CREATE TRIGGER */
1374 TriggerStack *trigStack; /* Trigger actions being coded */
1375 const char *zAuthContext; /* The 6th parameter to db->xAuth callbacks */
1376#ifndef SQLITE_OMIT_VIRTUALTABLE
1377 Token sArg; /* Complete text of a module argument */
1378 u8 declareVtab; /* True if inside sqlite3_declare_vtab() */
1379 Table *pVirtualLock; /* Require virtual table lock on this table */
1380#endif
1381#if defined(SQLITE_TEST) || SQLITE_MAX_EXPR_DEPTH>0
1382 int nHeight; /* Expression tree height of current sub-select */
1383#endif
1384};
1385
1386#ifdef SQLITE_OMIT_VIRTUALTABLE
1387 #define IN_DECLARE_VTAB 0
1388#else
1389 #define IN_DECLARE_VTAB (pParse->declareVtab)
1390#endif
1391
1392/*
1393** An instance of the following structure can be declared on a stack and used
1394** to save the Parse.zAuthContext value so that it can be restored later.
1395*/
1396struct AuthContext {
1397 const char *zAuthContext; /* Put saved Parse.zAuthContext here */
1398 Parse *pParse; /* The Parse structure */
1399};
1400
1401/*
1402** Bitfield flags for P2 value in OP_Insert and OP_Delete
1403*/
1404#define OPFLAG_NCHANGE 1 /* Set to update db->nChange */
1405#define OPFLAG_LASTROWID 2 /* Set to update db->lastRowid */
1406#define OPFLAG_ISUPDATE 4 /* This OP_Insert is an sql UPDATE */
1407#define OPFLAG_APPEND 8 /* This is likely to be an append */
1408
1409/*
1410 * Each trigger present in the database schema is stored as an instance of
1411 * struct Trigger.
1412 *
1413 * Pointers to instances of struct Trigger are stored in two ways.
1414 * 1. In the "trigHash" hash table (part of the sqlite3* that represents the
1415 * database). This allows Trigger structures to be retrieved by name.
1416 * 2. All triggers associated with a single table form a linked list, using the
1417 * pNext member of struct Trigger. A pointer to the first element of the
1418 * linked list is stored as the "pTrigger" member of the associated
1419 * struct Table.
1420 *
1421 * The "step_list" member points to the first element of a linked list
1422 * containing the SQL statements specified as the trigger program.
1423 */
1424struct Trigger {
1425 char *name; /* The name of the trigger */
1426 char *table; /* The table or view to which the trigger applies */
1427 u8 op; /* One of TK_DELETE, TK_UPDATE, TK_INSERT */
1428 u8 tr_tm; /* One of TRIGGER_BEFORE, TRIGGER_AFTER */
1429 Expr *pWhen; /* The WHEN clause of the expresion (may be NULL) */
1430 IdList *pColumns; /* If this is an UPDATE OF <column-list> trigger,
1431 the <column-list> is stored here */
1432 Token nameToken; /* Token containing zName. Use during parsing only */
1433 Schema *pSchema; /* Schema containing the trigger */
1434 Schema *pTabSchema; /* Schema containing the table */
1435 TriggerStep *step_list; /* Link list of trigger program steps */
1436 Trigger *pNext; /* Next trigger associated with the table */
1437};
1438
1439/*
1440** A trigger is either a BEFORE or an AFTER trigger. The following constants
1441** determine which.
1442**
1443** If there are multiple triggers, you might of some BEFORE and some AFTER.
1444** In that cases, the constants below can be ORed together.
1445*/
1446#define TRIGGER_BEFORE 1
1447#define TRIGGER_AFTER 2
1448
1449/*
1450 * An instance of struct TriggerStep is used to store a single SQL statement
1451 * that is a part of a trigger-program.
1452 *
1453 * Instances of struct TriggerStep are stored in a singly linked list (linked
1454 * using the "pNext" member) referenced by the "step_list" member of the
1455 * associated struct Trigger instance. The first element of the linked list is
1456 * the first step of the trigger-program.
1457 *
1458 * The "op" member indicates whether this is a "DELETE", "INSERT", "UPDATE" or
1459 * "SELECT" statement. The meanings of the other members is determined by the
1460 * value of "op" as follows:
1461 *
1462 * (op == TK_INSERT)
1463 * orconf -> stores the ON CONFLICT algorithm
1464 * pSelect -> If this is an INSERT INTO ... SELECT ... statement, then
1465 * this stores a pointer to the SELECT statement. Otherwise NULL.
1466 * target -> A token holding the name of the table to insert into.
1467 * pExprList -> If this is an INSERT INTO ... VALUES ... statement, then
1468 * this stores values to be inserted. Otherwise NULL.
1469 * pIdList -> If this is an INSERT INTO ... (<column-names>) VALUES ...
1470 * statement, then this stores the column-names to be
1471 * inserted into.
1472 *
1473 * (op == TK_DELETE)
1474 * target -> A token holding the name of the table to delete from.
1475 * pWhere -> The WHERE clause of the DELETE statement if one is specified.
1476 * Otherwise NULL.
1477 *
1478 * (op == TK_UPDATE)
1479 * target -> A token holding the name of the table to update rows of.
1480 * pWhere -> The WHERE clause of the UPDATE statement if one is specified.
1481 * Otherwise NULL.
1482 * pExprList -> A list of the columns to update and the expressions to update
1483 * them to. See sqlite3Update() documentation of "pChanges"
1484 * argument.
1485 *
1486 */
1487struct TriggerStep {
1488 int op; /* One of TK_DELETE, TK_UPDATE, TK_INSERT, TK_SELECT */
1489 int orconf; /* OE_Rollback etc. */
1490 Trigger *pTrig; /* The trigger that this step is a part of */
1491
1492 Select *pSelect; /* Valid for SELECT and sometimes
1493 INSERT steps (when pExprList == 0) */
1494 Token target; /* Valid for DELETE, UPDATE, INSERT steps */
1495 Expr *pWhere; /* Valid for DELETE, UPDATE steps */
1496 ExprList *pExprList; /* Valid for UPDATE statements and sometimes
1497 INSERT steps (when pSelect == 0) */
1498 IdList *pIdList; /* Valid for INSERT statements only */
1499 TriggerStep *pNext; /* Next in the link-list */
1500 TriggerStep *pLast; /* Last element in link-list. Valid for 1st elem only */
1501};
1502
1503/*
1504 * An instance of struct TriggerStack stores information required during code
1505 * generation of a single trigger program. While the trigger program is being
1506 * coded, its associated TriggerStack instance is pointed to by the
1507 * "pTriggerStack" member of the Parse structure.
1508 *
1509 * The pTab member points to the table that triggers are being coded on. The
1510 * newIdx member contains the index of the vdbe cursor that points at the temp
1511 * table that stores the new.* references. If new.* references are not valid
1512 * for the trigger being coded (for example an ON DELETE trigger), then newIdx
1513 * is set to -1. The oldIdx member is analogous to newIdx, for old.* references.
1514 *
1515 * The ON CONFLICT policy to be used for the trigger program steps is stored
1516 * as the orconf member. If this is OE_Default, then the ON CONFLICT clause
1517 * specified for individual triggers steps is used.
1518 *
1519 * struct TriggerStack has a "pNext" member, to allow linked lists to be
1520 * constructed. When coding nested triggers (triggers fired by other triggers)
1521 * each nested trigger stores its parent trigger's TriggerStack as the "pNext"
1522 * pointer. Once the nested trigger has been coded, the pNext value is restored
1523 * to the pTriggerStack member of the Parse stucture and coding of the parent
1524 * trigger continues.
1525 *
1526 * Before a nested trigger is coded, the linked list pointed to by the
1527 * pTriggerStack is scanned to ensure that the trigger is not about to be coded
1528 * recursively. If this condition is detected, the nested trigger is not coded.
1529 */
1530struct TriggerStack {
1531 Table *pTab; /* Table that triggers are currently being coded on */
1532 int newIdx; /* Index of vdbe cursor to "new" temp table */
1533 int oldIdx; /* Index of vdbe cursor to "old" temp table */
1534 int orconf; /* Current orconf policy */
1535 int ignoreJump; /* where to jump to for a RAISE(IGNORE) */
1536 Trigger *pTrigger; /* The trigger currently being coded */
1537 TriggerStack *pNext; /* Next trigger down on the trigger stack */
1538};
1539
1540/*
1541** The following structure contains information used by the sqliteFix...
1542** routines as they walk the parse tree to make database references
1543** explicit.
1544*/
1545typedef struct DbFixer DbFixer;
1546struct DbFixer {
1547 Parse *pParse; /* The parsing context. Error messages written here */
1548 const char *zDb; /* Make sure all objects are contained in this database */
1549 const char *zType; /* Type of the container - used for error messages */
1550 const Token *pName; /* Name of the container - used for error messages */
1551};
1552
1553/*
1554** A pointer to this structure is used to communicate information
1555** from sqlite3Init and OP_ParseSchema into the sqlite3InitCallback.
1556*/
1557typedef struct {
1558 sqlite3 *db; /* The database being initialized */
1559 int iDb; /* 0 for main database. 1 for TEMP, 2.. for ATTACHed */
1560 char **pzErrMsg; /* Error message stored here */
1561 int rc; /* Result code stored here */
1562} InitData;
1563
1564/*
1565** Assuming zIn points to the first byte of a UTF-8 character,
1566** advance zIn to point to the first byte of the next UTF-8 character.
1567*/
1568#define SQLITE_SKIP_UTF8(zIn) { \
1569 if( (*(zIn++))>=0xc0 ){ \
1570 while( (*zIn & 0xc0)==0x80 ){ zIn++; } \
1571 } \
1572}
1573
1574/*
1575** The SQLITE_CORRUPT_BKPT macro can be either a constant (for production
1576** builds) or a function call (for debugging). If it is a function call,
1577** it allows the operator to set a breakpoint at the spot where database
1578** corruption is first detected.
1579*/
1580#ifdef SQLITE_DEBUG
1581 int sqlite3Corrupt(void);
1582# define SQLITE_CORRUPT_BKPT sqlite3Corrupt()
1583#else
1584# define SQLITE_CORRUPT_BKPT SQLITE_CORRUPT
1585#endif
1586
1587/*
1588** Internal function prototypes
1589*/
1590int sqlite3StrICmp(const char *, const char *);
1591int sqlite3StrNICmp(const char *, const char *, int);
1592int sqlite3IsNumber(const char*, int*, u8);
1593
1594void *sqlite3MallocZero(unsigned);
1595void *sqlite3DbMallocZero(sqlite3*, unsigned);
1596void *sqlite3DbMallocRaw(sqlite3*, unsigned);
1597char *sqlite3StrDup(const char*);
1598char *sqlite3StrNDup(const char*, int);
1599char *sqlite3DbStrDup(sqlite3*,const char*);
1600char *sqlite3DbStrNDup(sqlite3*,const char*, int);
1601void *sqlite3DbReallocOrFree(sqlite3 *, void *, int);
1602void *sqlite3DbRealloc(sqlite3 *, void *, int);
1603
1604char *sqlite3MPrintf(sqlite3*,const char*, ...);
1605char *sqlite3VMPrintf(sqlite3*,const char*, va_list);
1606#if defined(SQLITE_TEST) || defined(SQLITE_DEBUG)
1607 void sqlite3DebugPrintf(const char*, ...);
1608 void *sqlite3TextToPtr(const char*);
1609#endif
1610void sqlite3SetString(char **, ...);
1611void sqlite3ErrorMsg(Parse*, const char*, ...);
1612void sqlite3ErrorClear(Parse*);
1613void sqlite3Dequote(char*);
1614void sqlite3DequoteExpr(sqlite3*, Expr*);
1615int sqlite3KeywordCode(const unsigned char*, int);
1616int sqlite3RunParser(Parse*, const char*, char **);
1617void sqlite3FinishCoding(Parse*);
1618Expr *sqlite3Expr(sqlite3*, int, Expr*, Expr*, const Token*);
1619Expr *sqlite3PExpr(Parse*, int, Expr*, Expr*, const Token*);
1620Expr *sqlite3RegisterExpr(Parse*,Token*);
1621Expr *sqlite3ExprAnd(sqlite3*,Expr*, Expr*);
1622void sqlite3ExprSpan(Expr*,Token*,Token*);
1623Expr *sqlite3ExprFunction(Parse*,ExprList*, Token*);
1624void sqlite3ExprAssignVarNumber(Parse*, Expr*);
1625void sqlite3ExprDelete(Expr*);
1626ExprList *sqlite3ExprListAppend(Parse*,ExprList*,Expr*,Token*);
1627void sqlite3ExprListDelete(ExprList*);
1628int sqlite3Init(sqlite3*, char**);
1629int sqlite3InitCallback(void*, int, char**, char**);
1630void sqlite3Pragma(Parse*,Token*,Token*,Token*,int);
1631void sqlite3ResetInternalSchema(sqlite3*, int);
1632void sqlite3BeginParse(Parse*,int);
1633void sqlite3CommitInternalChanges(sqlite3*);
1634Table *sqlite3ResultSetOfSelect(Parse*,char*,Select*);
1635void sqlite3OpenMasterTable(Parse *, int);
1636void sqlite3StartTable(Parse*,Token*,Token*,int,int,int,int);
1637void sqlite3AddColumn(Parse*,Token*);
1638void sqlite3AddNotNull(Parse*, int);
1639void sqlite3AddPrimaryKey(Parse*, ExprList*, int, int, int);
1640void sqlite3AddCheckConstraint(Parse*, Expr*);
1641void sqlite3AddColumnType(Parse*,Token*);
1642void sqlite3AddDefaultValue(Parse*,Expr*);
1643void sqlite3AddCollateType(Parse*, const char*, int);
1644void sqlite3EndTable(Parse*,Token*,Token*,Select*);
1645
1646void sqlite3CreateView(Parse*,Token*,Token*,Token*,Select*,int,int);
1647
1648#if !defined(SQLITE_OMIT_VIEW) || !defined(SQLITE_OMIT_VIRTUALTABLE)
1649 int sqlite3ViewGetColumnNames(Parse*,Table*);
1650#else
1651# define sqlite3ViewGetColumnNames(A,B) 0
1652#endif
1653
1654void sqlite3DropTable(Parse*, SrcList*, int, int);
1655void sqlite3DeleteTable(Table*);
1656void sqlite3Insert(Parse*, SrcList*, ExprList*, Select*, IdList*, int);
1657void *sqlite3ArrayAllocate(sqlite3*,void*,int,int,int*,int*,int*);
1658IdList *sqlite3IdListAppend(sqlite3*, IdList*, Token*);
1659int sqlite3IdListIndex(IdList*,const char*);
1660SrcList *sqlite3SrcListAppend(sqlite3*, SrcList*, Token*, Token*);
1661SrcList *sqlite3SrcListAppendFromTerm(Parse*, SrcList*, Token*, Token*, Token*,
1662 Select*, Expr*, IdList*);
1663void sqlite3SrcListShiftJoinType(SrcList*);
1664void sqlite3SrcListAssignCursors(Parse*, SrcList*);
1665void sqlite3IdListDelete(IdList*);
1666void sqlite3SrcListDelete(SrcList*);
1667void sqlite3CreateIndex(Parse*,Token*,Token*,SrcList*,ExprList*,int,Token*,
1668 Token*, int, int);
1669void sqlite3DropIndex(Parse*, SrcList*, int);
1670int sqlite3Select(Parse*, Select*, int, int, Select*, int, int*, char *aff);
1671Select *sqlite3SelectNew(Parse*,ExprList*,SrcList*,Expr*,ExprList*,
1672 Expr*,ExprList*,int,Expr*,Expr*);
1673void sqlite3SelectDelete(Select*);
1674Table *sqlite3SrcListLookup(Parse*, SrcList*);
1675int sqlite3IsReadOnly(Parse*, Table*, int);
1676void sqlite3OpenTable(Parse*, int iCur, int iDb, Table*, int);
1677void sqlite3DeleteFrom(Parse*, SrcList*, Expr*);
1678void sqlite3Update(Parse*, SrcList*, ExprList*, Expr*, int);
1679WhereInfo *sqlite3WhereBegin(Parse*, SrcList*, Expr*, ExprList**);
1680void sqlite3WhereEnd(WhereInfo*);
1681void sqlite3ExprCodeGetColumn(Vdbe*, Table*, int, int);
1682void sqlite3ExprCode(Parse*, Expr*);
1683void sqlite3ExprCodeAndCache(Parse*, Expr*);
1684int sqlite3ExprCodeExprList(Parse*, ExprList*);
1685void sqlite3ExprIfTrue(Parse*, Expr*, int, int);
1686void sqlite3ExprIfFalse(Parse*, Expr*, int, int);
1687Table *sqlite3FindTable(sqlite3*,const char*, const char*);
1688Table *sqlite3LocateTable(Parse*,const char*, const char*);
1689Index *sqlite3FindIndex(sqlite3*,const char*, const char*);
1690void sqlite3UnlinkAndDeleteTable(sqlite3*,int,const char*);
1691void sqlite3UnlinkAndDeleteIndex(sqlite3*,int,const char*);
1692void sqlite3Vacuum(Parse*);
1693int sqlite3RunVacuum(char**, sqlite3*);
1694char *sqlite3NameFromToken(sqlite3*, Token*);
1695int sqlite3ExprCompare(Expr*, Expr*);
1696int sqlite3ExprResolveNames(NameContext *, Expr *);
1697int sqlite3ExprAnalyzeAggregates(NameContext*, Expr*);
1698int sqlite3ExprAnalyzeAggList(NameContext*,ExprList*);
1699Vdbe *sqlite3GetVdbe(Parse*);
1700Expr *sqlite3CreateIdExpr(Parse *, const char*);
1701void sqlite3Randomness(int, void*);
1702void sqlite3RollbackAll(sqlite3*);
1703void sqlite3CodeVerifySchema(Parse*, int);
1704void sqlite3BeginTransaction(Parse*, int);
1705void sqlite3CommitTransaction(Parse*);
1706void sqlite3RollbackTransaction(Parse*);
1707int sqlite3ExprIsConstant(Expr*);
1708int sqlite3ExprIsConstantNotJoin(Expr*);
1709int sqlite3ExprIsConstantOrFunction(Expr*);
1710int sqlite3ExprIsInteger(Expr*, int*);
1711int sqlite3IsRowid(const char*);
1712void sqlite3GenerateRowDelete(sqlite3*, Vdbe*, Table*, int, int);
1713void sqlite3GenerateRowIndexDelete(Vdbe*, Table*, int, char*);
1714void sqlite3GenerateIndexKey(Vdbe*, Index*, int);
1715void sqlite3GenerateConstraintChecks(Parse*,Table*,int,char*,int,int,int,int);
1716void sqlite3CompleteInsertion(Parse*, Table*, int, char*, int, int, int, int);
1717void sqlite3OpenTableAndIndices(Parse*, Table*, int, int);
1718void sqlite3BeginWriteOperation(Parse*, int, int);
1719Expr *sqlite3ExprDup(sqlite3*,Expr*);
1720void sqlite3TokenCopy(sqlite3*,Token*, Token*);
1721ExprList *sqlite3ExprListDup(sqlite3*,ExprList*);
1722SrcList *sqlite3SrcListDup(sqlite3*,SrcList*);
1723IdList *sqlite3IdListDup(sqlite3*,IdList*);
1724Select *sqlite3SelectDup(sqlite3*,Select*);
1725FuncDef *sqlite3FindFunction(sqlite3*,const char*,int,int,u8,int);
1726void sqlite3RegisterBuiltinFunctions(sqlite3*);
1727void sqlite3RegisterDateTimeFunctions(sqlite3*);
1728int sqlite3SafetyOn(sqlite3*);
1729int sqlite3SafetyOff(sqlite3*);
1730int sqlite3SafetyCheck(sqlite3*);
1731void sqlite3ChangeCookie(sqlite3*, Vdbe*, int);
1732
1733#ifndef SQLITE_OMIT_TRIGGER
1734 void sqlite3BeginTrigger(Parse*, Token*,Token*,int,int,IdList*,SrcList*,
1735 Expr*,int, int);
1736 void sqlite3FinishTrigger(Parse*, TriggerStep*, Token*);
1737 void sqlite3DropTrigger(Parse*, SrcList*, int);
1738 void sqlite3DropTriggerPtr(Parse*, Trigger*);
1739 int sqlite3TriggersExist(Parse*, Table*, int, ExprList*);
1740 int sqlite3CodeRowTrigger(Parse*, int, ExprList*, int, Table *, int, int,
1741 int, int);
1742 void sqliteViewTriggers(Parse*, Table*, Expr*, int, ExprList*);
1743 void sqlite3DeleteTriggerStep(TriggerStep*);
1744 TriggerStep *sqlite3TriggerSelectStep(sqlite3*,Select*);
1745 TriggerStep *sqlite3TriggerInsertStep(sqlite3*,Token*, IdList*,
1746 ExprList*,Select*,int);
1747 TriggerStep *sqlite3TriggerUpdateStep(sqlite3*,Token*,ExprList*, Expr*, int);
1748 TriggerStep *sqlite3TriggerDeleteStep(sqlite3*,Token*, Expr*);
1749 void sqlite3DeleteTrigger(Trigger*);
1750 void sqlite3UnlinkAndDeleteTrigger(sqlite3*,int,const char*);
1751#else
1752# define sqlite3TriggersExist(A,B,C,D,E,F) 0
1753# define sqlite3DeleteTrigger(A)
1754# define sqlite3DropTriggerPtr(A,B)
1755# define sqlite3UnlinkAndDeleteTrigger(A,B,C)
1756# define sqlite3CodeRowTrigger(A,B,C,D,E,F,G,H,I) 0
1757#endif
1758
1759int sqlite3JoinType(Parse*, Token*, Token*, Token*);
1760void sqlite3CreateForeignKey(Parse*, ExprList*, Token*, ExprList*, int);
1761void sqlite3DeferForeignKey(Parse*, int);
1762#ifndef SQLITE_OMIT_AUTHORIZATION
1763 void sqlite3AuthRead(Parse*,Expr*,Schema*,SrcList*);
1764 int sqlite3AuthCheck(Parse*,int, const char*, const char*, const char*);
1765 void sqlite3AuthContextPush(Parse*, AuthContext*, const char*);
1766 void sqlite3AuthContextPop(AuthContext*);
1767#else
1768# define sqlite3AuthRead(a,b,c)
1769# define sqlite3AuthCheck(a,b,c,d,e) SQLITE_OK
1770# define sqlite3AuthContextPush(a,b,c)
1771# define sqlite3AuthContextPop(a) ((void)(a))
1772#endif
1773void sqlite3Attach(Parse*, Expr*, Expr*, Expr*);
1774void sqlite3Detach(Parse*, Expr*);
1775int sqlite3BtreeFactory(const sqlite3 *db, const char *zFilename,
1776 int omitJournal, int nCache, int flags, Btree **ppBtree);
1777int sqlite3FixInit(DbFixer*, Parse*, int, const char*, const Token*);
1778int sqlite3FixSrcList(DbFixer*, SrcList*);
1779int sqlite3FixSelect(DbFixer*, Select*);
1780int sqlite3FixExpr(DbFixer*, Expr*);
1781int sqlite3FixExprList(DbFixer*, ExprList*);
1782int sqlite3FixTriggerStep(DbFixer*, TriggerStep*);
1783int sqlite3AtoF(const char *z, double*);
1784char *sqlite3_snprintf(int,char*,const char*,...);
1785int sqlite3GetInt32(const char *, int*);
1786int sqlite3FitsIn64Bits(const char *);
1787int sqlite3Utf16ByteLen(const void *pData, int nChar);
1788int sqlite3Utf8CharLen(const char *pData, int nByte);
1789int sqlite3Utf8Read(const u8*, const u8*, const u8**);
1790int sqlite3PutVarint(unsigned char *, u64);
1791int sqlite3GetVarint(const unsigned char *, u64 *);
1792int sqlite3GetVarint32(const unsigned char *, u32 *);
1793int sqlite3VarintLen(u64 v);
1794void sqlite3IndexAffinityStr(Vdbe *, Index *);
1795void sqlite3TableAffinityStr(Vdbe *, Table *);
1796char sqlite3CompareAffinity(Expr *pExpr, char aff2);
1797int sqlite3IndexAffinityOk(Expr *pExpr, char idx_affinity);
1798char sqlite3ExprAffinity(Expr *pExpr);
1799int sqlite3Atoi64(const char*, i64*);
1800void sqlite3Error(sqlite3*, int, const char*,...);
1801void *sqlite3HexToBlob(sqlite3*, const char *z);
1802int sqlite3TwoPartName(Parse *, Token *, Token *, Token **);
1803const char *sqlite3ErrStr(int);
1804int sqlite3ReadSchema(Parse *pParse);
1805CollSeq *sqlite3FindCollSeq(sqlite3*,u8 enc, const char *,int,int);
1806CollSeq *sqlite3LocateCollSeq(Parse *pParse, const char *zName, int nName);
1807CollSeq *sqlite3ExprCollSeq(Parse *pParse, Expr *pExpr);
1808Expr *sqlite3ExprSetColl(Parse *pParse, Expr *, Token *);
1809int sqlite3CheckCollSeq(Parse *, CollSeq *);
1810int sqlite3CheckObjectName(Parse *, const char *);
1811void sqlite3VdbeSetChanges(sqlite3 *, int);
1812
1813const void *sqlite3ValueText(sqlite3_value*, u8);
1814int sqlite3ValueBytes(sqlite3_value*, u8);
1815void sqlite3ValueSetStr(sqlite3_value*, int, const void *,u8,
1816 void(*)(void*));
1817void sqlite3ValueFree(sqlite3_value*);
1818sqlite3_value *sqlite3ValueNew(sqlite3 *);
1819char *sqlite3Utf16to8(sqlite3 *, const void*, int);
1820int sqlite3ValueFromExpr(sqlite3 *, Expr *, u8, u8, sqlite3_value **);
1821void sqlite3ValueApplyAffinity(sqlite3_value *, u8, u8);
1822#ifndef SQLITE_AMALGAMATION
1823extern const unsigned char sqlite3UpperToLower[];
1824#endif
1825void sqlite3RootPageMoved(Db*, int, int);
1826void sqlite3Reindex(Parse*, Token*, Token*);
1827void sqlite3AlterFunctions(sqlite3*);
1828void sqlite3AlterRenameTable(Parse*, SrcList*, Token*);
1829int sqlite3GetToken(const unsigned char *, int *);
1830void sqlite3NestedParse(Parse*, const char*, ...);
1831void sqlite3ExpirePreparedStatements(sqlite3*);
1832void sqlite3CodeSubselect(Parse *, Expr *);
1833int sqlite3SelectResolve(Parse *, Select *, NameContext *);
1834void sqlite3ColumnDefault(Vdbe *, Table *, int);
1835void sqlite3AlterFinishAddColumn(Parse *, Token *);
1836void sqlite3AlterBeginAddColumn(Parse *, SrcList *);
1837CollSeq *sqlite3GetCollSeq(sqlite3*, CollSeq *, const char *, int);
1838char sqlite3AffinityType(const Token*);
1839void sqlite3Analyze(Parse*, Token*, Token*);
1840int sqlite3InvokeBusyHandler(BusyHandler*);
1841int sqlite3FindDb(sqlite3*, Token*);
1842int sqlite3AnalysisLoad(sqlite3*,int iDB);
1843void sqlite3DefaultRowEst(Index*);
1844void sqlite3RegisterLikeFunctions(sqlite3*, int);
1845int sqlite3IsLikeFunction(sqlite3*,Expr*,int*,char*);
1846void sqlite3AttachFunctions(sqlite3 *);
1847void sqlite3MinimumFileFormat(Parse*, int, int);
1848void sqlite3SchemaFree(void *);
1849Schema *sqlite3SchemaGet(sqlite3 *, Btree *);
1850int sqlite3SchemaToIndex(sqlite3 *db, Schema *);
1851KeyInfo *sqlite3IndexKeyinfo(Parse *, Index *);
1852int sqlite3CreateFunc(sqlite3 *, const char *, int, int, void *,
1853 void (*)(sqlite3_context*,int,sqlite3_value **),
1854 void (*)(sqlite3_context*,int,sqlite3_value **), void (*)(sqlite3_context*));
1855int sqlite3ApiExit(sqlite3 *db, int);
1856void sqlite3AbortOtherActiveVdbes(sqlite3 *, Vdbe *);
1857int sqlite3OpenTempDatabase(Parse *);
1858
1859
1860/*
1861** The interface to the LEMON-generated parser
1862*/
1863void *sqlite3ParserAlloc(void*(*)(size_t));
1864void sqlite3ParserFree(void*, void(*)(void*));
1865void sqlite3Parser(void*, int, Token, Parse*);
1866
1867#ifndef SQLITE_OMIT_LOAD_EXTENSION
1868 void sqlite3CloseExtensions(sqlite3*);
1869 int sqlite3AutoLoadExtensions(sqlite3*);
1870#else
1871# define sqlite3CloseExtensions(X)
1872# define sqlite3AutoLoadExtensions(X) SQLITE_OK
1873#endif
1874
1875#ifndef SQLITE_OMIT_SHARED_CACHE
1876 void sqlite3TableLock(Parse *, int, int, u8, const char *);
1877#else
1878 #define sqlite3TableLock(v,w,x,y,z)
1879#endif
1880
1881#ifdef SQLITE_TEST
1882 int sqlite3Utf8To8(unsigned char*);
1883#endif
1884
1885/*
1886** The MallocDisallow() and MallocAllow() routines are like asserts.
1887** Call them around a section of code that you do not expect to do
1888** any memory allocation.
1889*/
1890#ifdef SQLITE_MEMDEBUG
1891 void sqlite3MallocDisallow(void);
1892 void sqlite3MallocAllow(void);
1893 void sqlite3MallocBenignFailure(int);
1894 void sqlite3MallocEnterBenignBlock(int isBenign);
1895 void sqlite3MallocLeaveBenignBlock();
1896#else
1897# define sqlite3MallocDisallow()
1898# define sqlite3MallocAllow()
1899# define sqlite3MallocBenignFailure(x)
1900# define sqlite3MallocEnterBenignBlock(x);
1901# define sqlite3MallocLeaveBenignBlock();
1902#endif
1903
1904
1905#ifdef SQLITE_OMIT_VIRTUALTABLE
1906# define sqlite3VtabClear(X)
1907# define sqlite3VtabSync(X,Y) (Y)
1908# define sqlite3VtabRollback(X)
1909# define sqlite3VtabCommit(X)
1910#else
1911 void sqlite3VtabClear(Table*);
1912 int sqlite3VtabSync(sqlite3 *db, int rc);
1913 int sqlite3VtabRollback(sqlite3 *db);
1914 int sqlite3VtabCommit(sqlite3 *db);
1915#endif
1916void sqlite3VtabLock(sqlite3_vtab*);
1917void sqlite3VtabUnlock(sqlite3*, sqlite3_vtab*);
1918void sqlite3VtabBeginParse(Parse*, Token*, Token*, Token*);
1919void sqlite3VtabFinishParse(Parse*, Token*);
1920void sqlite3VtabArgInit(Parse*);
1921void sqlite3VtabArgExtend(Parse*, Token*);
1922int sqlite3VtabCallCreate(sqlite3*, int, const char *, char **);
1923int sqlite3VtabCallConnect(Parse*, Table*);
1924int sqlite3VtabCallDestroy(sqlite3*, int, const char *);
1925int sqlite3VtabBegin(sqlite3 *, sqlite3_vtab *);
1926FuncDef *sqlite3VtabOverloadFunction(sqlite3 *,FuncDef*, int nArg, Expr*);
1927void sqlite3InvalidFunction(sqlite3_context*,int,sqlite3_value**);
1928int sqlite3Reprepare(Vdbe*);
1929void sqlite3ExprListCheckLength(Parse*, ExprList*, int, const char*);
1930CollSeq *sqlite3BinaryCompareCollSeq(Parse *, Expr *, Expr *);
1931
1932#ifdef SQLITE_ENABLE_ATOMIC_WRITE
1933 int sqlite3JournalOpen(sqlite3_vfs *, const char *, sqlite3_file *, int, int);
1934 int sqlite3JournalSize(sqlite3_vfs *);
1935 int sqlite3JournalCreate(sqlite3_file *);
1936#else
1937 #define sqlite3JournalSize(pVfs) ((pVfs)->szOsFile)
1938#endif
1939
1940#if defined(SQLITE_TEST) || SQLITE_MAX_EXPR_DEPTH>0
1941 void sqlite3ExprSetHeight(Expr *);
1942 int sqlite3SelectExprHeight(Select *);
1943#else
1944 #define sqlite3ExprSetHeight(x)
1945#endif
1946
1947u32 sqlite3Get4byte(const u8*);
1948void sqlite3Put4byte(u8*, u32);
1949
1950#ifdef SQLITE_SSE
1951#include "sseInt.h"
1952#endif
1953
1954#ifdef SQLITE_DEBUG
1955 void sqlite3ParserTrace(FILE*, char *);
1956#endif
1957
1958/*
1959** If the SQLITE_ENABLE IOTRACE exists then the global variable
1960** sqlite3_io_trace is a pointer to a printf-like routine used to
1961** print I/O tracing messages.
1962*/
1963#ifdef SQLITE_ENABLE_IOTRACE
1964# define IOTRACE(A) if( sqlite3_io_trace ){ sqlite3_io_trace A; }
1965 void sqlite3VdbeIOTraceSql(Vdbe*);
1966#else
1967# define IOTRACE(A)
1968# define sqlite3VdbeIOTraceSql(X)
1969#endif
1970SQLITE_EXTERN void (*sqlite3_io_trace)(const char*,...);
1971
1972#endif
generated by cgit v1.1 at 2024-12-27 10:07:49 +0000