System.Data.SQLite

      </table>
    </div>
    <div id="mainSection">
    <div id="mainBody">
    <h1 class="heading">Version History</h1>
    <p><b>1.0.100.0 - February XX, 2016 <font color="red">(release scheduled)</font></b></p>
    <ul>
      <li>Updated to <a href="https://www.sqlite.org/releaselog/3_11_0.html">SQLite 3.11</a>.</li>
      <li>Properly handle NULL values in the &quot;name&quot; column of the results returned by PRAGMA index_info(). Fix for <a href="https://system.data.sqlite.org/index.html/info/5251bd0878">[5251bd0878]</a>.</li>
      <li>For column types that resolve to boolean, recognize case-insensitive prefixes of &quot;True&quot; and &quot;False&quot;. Fix for <a href="https://system.data.sqlite.org/index.html/info/dbd65441a5">[dbd65441a5]</a>.</li>
      <li>Add NoVerifyTextAffinity connection flag to skip type affinity checking when fetching a column value as a string. Pursuant to <a href="https://system.data.sqlite.org/index.html/info/dbd65441a5">[dbd65441a5]</a>.</li>
    </ul>
    <p><b>1.0.99.0 - December 9, 2015</b></p>
    <ul>
      <li>Updated to <a href="https://www.sqlite.org/releaselog/3_9_2.html">SQLite 3.9.2</a>.</li>

<?xml version="1.0" encoding="utf-8"?>
<!--
 *
 * sqlite3.props -
 *
 * Written by Joe Mistachkin.
 * Released to the public domain, use at your own risk!
 *
-->
<Project DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003" ToolsVersion="4.0">
  <PropertyGroup Label="UserMacros">
    <SQLITE_MANIFEST_VERSION>3.11.0.0</SQLITE_MANIFEST_VERSION>
    <SQLITE_RC_VERSION>3,11,0,0</SQLITE_RC_VERSION>
    <SQLITE_COMMON_DEFINES>_CRT_SECURE_NO_DEPRECATE;_CRT_SECURE_NO_WARNINGS;_CRT_NONSTDC_NO_DEPRECATE;_CRT_NONSTDC_NO_WARNINGS;SQLITE_THREADSAFE=1;SQLITE_USE_URI=1;SQLITE_ENABLE_COLUMN_METADATA=1;SQLITE_ENABLE_STAT4=1;SQLITE_ENABLE_FTS3=1;SQLITE_ENABLE_LOAD_EXTENSION=1;SQLITE_ENABLE_RTREE=1;SQLITE_SOUNDEX=1;SQLITE_ENABLE_MEMORY_MANAGEMENT=1;SQLITE_ENABLE_API_ARMOR=1</SQLITE_COMMON_DEFINES>
    <SQLITE_EXTRA_DEFINES>SQLITE_PLACEHOLDER=1;SQLITE_HAS_CODEC=1</SQLITE_EXTRA_DEFINES>
    <SQLITE_WINCE_200X_DEFINES>SQLITE_OMIT_WAL=1</SQLITE_WINCE_200X_DEFINES>
    <SQLITE_WINCE_2013_DEFINES>HAVE_ERRNO_H=1;SQLITE_MSVC_LOCALTIME_API=1</SQLITE_WINCE_2013_DEFINES>
    <SQLITE_DEBUG_DEFINES>SQLITE_DEBUG=1;SQLITE_MEMDEBUG=1;SQLITE_ENABLE_EXPENSIVE_ASSERT=1</SQLITE_DEBUG_DEFINES>
    <SQLITE_RELEASE_DEFINES>SQLITE_WIN32_MALLOC=1</SQLITE_RELEASE_DEFINES>
    <SQLITE_DISABLE_WARNINGS>4055;4100;4127;4146;4210;4232;4244;4245;4267;4306;4389;4701;4703;4706</SQLITE_DISABLE_WARNINGS>

<VisualStudioPropertySheet
	ProjectType="Visual C++"
	Version="8.00"
	Name="sqlite3"
	>
	<UserMacro
		Name="SQLITE_MANIFEST_VERSION"
		Value="3.11.0.0"
		PerformEnvironmentSet="true"
	/>
	<UserMacro
		Name="SQLITE_RC_VERSION"
		Value="3,11,0,0"
		PerformEnvironmentSet="true"
	/>
	<UserMacro
		Name="SQLITE_COMMON_DEFINES"
		Value="_CRT_SECURE_NO_DEPRECATE;_CRT_SECURE_NO_WARNINGS;_CRT_NONSTDC_NO_DEPRECATE;_CRT_NONSTDC_NO_WARNINGS;SQLITE_THREADSAFE=1;SQLITE_USE_URI=1;SQLITE_ENABLE_COLUMN_METADATA=1;SQLITE_ENABLE_STAT4=1;SQLITE_ENABLE_FTS3=1;SQLITE_ENABLE_LOAD_EXTENSION=1;SQLITE_ENABLE_RTREE=1;SQLITE_SOUNDEX=1;SQLITE_ENABLE_MEMORY_MANAGEMENT=1;SQLITE_ENABLE_API_ARMOR=1"
		PerformEnvironmentSet="true"
	/>

/******************************************************************************
** This file is an amalgamation of many separate C source files from SQLite
** version 3.11.0.  By combining all the individual C code files into this 
** single large file, the entire code can be compiled as a single translation
** unit.  This allows many compilers to do optimizations that would not be
** possible if the files were compiled separately.  Performance improvements
** of 5% or more are commonly seen when SQLite is compiled as a single
** translation unit.
**
** This file is all you need to compile SQLite.  To use SQLite in other

#define SQLITE_HOMEGROWN_RECURSIVE_MUTEX 1
#define SQLITE_OMIT_LOAD_EXTENSION 1
#define SQLITE_ENABLE_LOCKING_STYLE 0
#define HAVE_UTIME 1
#else
/* This is not VxWorks. */
#define OS_VXWORKS 0
#define HAVE_FCHOWN 1
#define HAVE_READLINK 1
#define HAVE_LSTAT 1
#endif /* defined(_WRS_KERNEL) */

/************** End of vxworks.h *********************************************/
/************** Continuing where we left off in sqliteInt.h ******************/

/*
** These #defines should enable >2GB file support on POSIX if the

** string contains the date and time of the check-in (UTC) and an SHA1
** hash of the entire source tree.
**
** See also: [sqlite3_libversion()],
** [sqlite3_libversion_number()], [sqlite3_sourceid()],
** [sqlite_version()] and [sqlite_source_id()].
*/
#define SQLITE_VERSION        "3.11.0"
#define SQLITE_VERSION_NUMBER 3011000
#define SQLITE_SOURCE_ID      "2016-02-12 18:48:09 a049fbbde5da2e43d41aa8c2b41f9eb21507ac76"

/*
** CAPI3REF: Run-Time Library Version Numbers
** KEYWORDS: sqlite3_version, sqlite3_sourceid
**
** These interfaces provide the same information as the [SQLITE_VERSION],
** [SQLITE_VERSION_NUMBER], and [SQLITE_SOURCE_ID] C preprocessor macros

** ^If an error occurs while evaluating the SQL statements passed into
** sqlite3_exec(), then execution of the current statement stops and
** subsequent statements are skipped.  ^If the 5th parameter to sqlite3_exec()
** is not NULL then any error message is written into memory obtained
** from [sqlite3_malloc()] and passed back through the 5th parameter.
** To avoid memory leaks, the application should invoke [sqlite3_free()]
** on error message strings returned through the 5th parameter of
** sqlite3_exec() after the error message string is no longer needed.
** ^If the 5th parameter to sqlite3_exec() is not NULL and no errors
** occur, then sqlite3_exec() sets the pointer in its 5th parameter to
** NULL before returning.
**
** ^If an sqlite3_exec() callback returns non-zero, the sqlite3_exec()
** routine returns SQLITE_ABORT without invoking the callback again and
** without running any subsequent SQL statements.

** sqlite3_libversion_number() returns a value greater than or equal to
** 3009000.
*/
struct sqlite3_index_info {
  /* Inputs */
  int nConstraint;           /* Number of entries in aConstraint */
  struct sqlite3_index_constraint {
     int iColumn;              /* Column constrained.  -1 for ROWID */
     unsigned char op;         /* Constraint operator */
     unsigned char usable;     /* True if this constraint is usable */
     int iTermOffset;          /* Used internally - xBestIndex should ignore */
  } *aConstraint;            /* Table of WHERE clause constraints */
  int nOrderBy;              /* Number of terms in the ORDER BY clause */
  struct sqlite3_index_orderby {
     int iColumn;              /* Column number */

**   *pnToken to the number of tokens in column iCol of the current row.
**
**   If parameter iCol is greater than or equal to the number of columns
**   in the table, SQLITE_RANGE is returned. Or, if an error occurs (e.g.
**   an OOM condition or IO error), an appropriate SQLite error code is 
**   returned.
**
**   This function may be quite inefficient if used with an FTS5 table
**   created with the "columnsize=0" option.
**
** xColumnText:
**   This function attempts to retrieve the text of column iCol of the
**   current document. If successful, (*pz) is set to point to a buffer
**   containing the text in utf-8 encoding, (*pn) is set to the size in bytes
**   (not characters) of the buffer and SQLITE_OK is returned. Otherwise,
**   if an error occurs, an SQLite error code is returned and the final values
**   of (*pz) and (*pn) are undefined.
**
** xPhraseCount:
**   Returns the number of phrases in the current query expression.
**
** xPhraseSize:
**   Returns the number of tokens in phrase iPhrase of the query. Phrases
**   are numbered starting from zero.
**
** xInstCount:
**   Set *pnInst to the total number of occurrences of all phrases within
**   the query within the current row. Return SQLITE_OK if successful, or
**   an error code (i.e. SQLITE_NOMEM) if an error occurs.
**
**   This API can be quite slow if used with an FTS5 table created with the
**   "detail=none" or "detail=column" option. If the FTS5 table is created 
**   with either "detail=none" or "detail=column" and "content=" option 
**   (i.e. if it is a contentless table), then this API always returns 0.
**
** xInst:
**   Query for the details of phrase match iIdx within the current row.
**   Phrase matches are numbered starting from zero, so the iIdx argument
**   should be greater than or equal to zero and smaller than the value
**   output by xInstCount().
**
**   Usually, output parameter *piPhrase is set to the phrase number, *piCol
**   to the column in which it occurs and *piOff the token offset of the
**   first token of the phrase. The exception is if the table was created
**   with the offsets=0 option specified. In this case *piOff is always
**   set to -1.
**
**   Returns SQLITE_OK if successful, or an error code (i.e. SQLITE_NOMEM) 
**   if an error occurs.
**
**   This API can be quite slow if used with an FTS5 table created with the
**   "detail=none" or "detail=column" option. 
**
** xRowid:
**   Returns the rowid of the current row.
**
** xTokenize:
**   Tokenize text using the tokenizer belonging to the FTS5 table.
**

**   xInstCount/xInst APIs. While the xInstCount/xInst APIs are more convenient
**   to use, this API may be faster under some circumstances. To iterate 
**   through instances of phrase iPhrase, use the following code:
**
**       Fts5PhraseIter iter;
**       int iCol, iOff;
**       for(pApi->xPhraseFirst(pFts, iPhrase, &iter, &iCol, &iOff);
**           iCol>=0;
**           pApi->xPhraseNext(pFts, &iter, &iCol, &iOff)
**       ){
**         // An instance of phrase iPhrase at offset iOff of column iCol
**       }
**
**   The Fts5PhraseIter structure is defined above. Applications should not
**   modify this structure directly - it should only be used as shown above
**   with the xPhraseFirst() and xPhraseNext() API methods (and by
**   xPhraseFirstColumn() and xPhraseNextColumn() as illustrated below).
**
**   This API can be quite slow if used with an FTS5 table created with the
**   "detail=none" or "detail=column" option. If the FTS5 table is created 
**   with either "detail=none" or "detail=column" and "content=" option 
**   (i.e. if it is a contentless table), then this API always iterates
**   through an empty set (all calls to xPhraseFirst() set iCol to -1).
**
** xPhraseNext()
**   See xPhraseFirst above.
**
** xPhraseFirstColumn()
**   This function and xPhraseNextColumn() are similar to the xPhraseFirst()
**   and xPhraseNext() APIs described above. The difference is that instead
**   of iterating through all instances of a phrase in the current row, these
**   APIs are used to iterate through the set of columns in the current row
**   that contain one or more instances of a specified phrase. For example:
**
**       Fts5PhraseIter iter;
**       int iCol;
**       for(pApi->xPhraseFirstColumn(pFts, iPhrase, &iter, &iCol);
**           iCol>=0;
**           pApi->xPhraseNextColumn(pFts, &iter, &iCol)
**       ){
**         // Column iCol contains at least one instance of phrase iPhrase
**       }
**
**   This API can be quite slow if used with an FTS5 table created with the
**   "detail=none" option. If the FTS5 table is created with either 
**   "detail=none" "content=" option (i.e. if it is a contentless table), 
**   then this API always iterates through an empty set (all calls to 
**   xPhraseFirstColumn() set iCol to -1).
**
**   The information accessed using this API and its companion
**   xPhraseFirstColumn() may also be obtained using xPhraseFirst/xPhraseNext
**   (or xInst/xInstCount). The chief advantage of this API is that it is
**   significantly more efficient than those alternatives when used with
**   "detail=column" tables.  
**
** xPhraseNextColumn()
**   See xPhraseFirstColumn above.
*/
struct Fts5ExtensionApi {
  int iVersion;                   /* Currently always set to 3 */

  void *(*xUserData)(Fts5Context*);

  int (*xColumnCount)(Fts5Context*);
  int (*xRowCount)(Fts5Context*, sqlite3_int64 *pnRow);
  int (*xColumnTotalSize)(Fts5Context*, int iCol, sqlite3_int64 *pnToken);

  int (*xQueryPhrase)(Fts5Context*, int iPhrase, void *pUserData,
    int(*)(const Fts5ExtensionApi*,Fts5Context*,void*)
  );
  int (*xSetAuxdata)(Fts5Context*, void *pAux, void(*xDelete)(void*));
  void *(*xGetAuxdata)(Fts5Context*, int bClear);

  int (*xPhraseFirst)(Fts5Context*, int iPhrase, Fts5PhraseIter*, int*, int*);
  void (*xPhraseNext)(Fts5Context*, Fts5PhraseIter*, int *piCol, int *piOff);

  int (*xPhraseFirstColumn)(Fts5Context*, int iPhrase, Fts5PhraseIter*, int*);
  void (*xPhraseNextColumn)(Fts5Context*, Fts5PhraseIter*, int *piCol);
};

/* 
** CUSTOM AUXILIARY FUNCTIONS
*************************************************************************/

/*************************************************************************

# define ALWAYS(X)      ((X)?1:(assert(0),0))
# define NEVER(X)       ((X)?(assert(0),1):0)
#else
# define ALWAYS(X)      (X)
# define NEVER(X)       (X)
#endif

/*
** Some malloc failures are only possible if SQLITE_TEST_REALLOC_STRESS is
** defined.  We need to defend against those failures when testing with
** SQLITE_TEST_REALLOC_STRESS, but we don't want the unreachable branches
** during a normal build.  The following macro can be used to disable tests
** that are always false except when SQLITE_TEST_REALLOC_STRESS is set.
*/
#if defined(SQLITE_TEST_REALLOC_STRESS)
# define ONLY_IF_REALLOC_STRESS(X)  (X)
#elif !defined(NDEBUG)
# define ONLY_IF_REALLOC_STRESS(X)  ((X)?(assert(0),1):0)
#else
# define ONLY_IF_REALLOC_STRESS(X)  (0)
#endif

/*
** Declarations used for tracing the operating system interfaces.
*/
#if defined(SQLITE_FORCE_OS_TRACE) || defined(SQLITE_TEST) || \
    (defined(SQLITE_DEBUG) && SQLITE_OS_WIN)
  extern int sqlite3OSTrace;
# define OSTRACE(X)          if( sqlite3OSTrace ) sqlite3DebugPrintf X

#endif

/*
** Default maximum size of memory used by memory-mapped I/O in the VFS
*/
#ifdef __APPLE__
# include <TargetConditionals.h>




#endif
#ifndef SQLITE_MAX_MMAP_SIZE
# if defined(__linux__) \
  || defined(_WIN32) \
  || (defined(__APPLE__) && defined(__MACH__)) \
  || defined(__sun) \
  || defined(__FreeBSD__) \

#define BTREE_BULKLOAD 0x00000001  /* Used to full index in sorted order */
#define BTREE_SEEK_EQ  0x00000002  /* EQ seeks only - no range seeks */

/* 
** Flags passed as the third argument to sqlite3BtreeCursor().
**
** For read-only cursors the wrFlag argument is always zero. For read-write
** cursors it may be set to either (BTREE_WRCSR|BTREE_FORDELETE) or just
** (BTREE_WRCSR). If the BTREE_FORDELETE bit is set, then the cursor will
** only be used by SQLite for the following:
**
**   * to seek to and then delete specific entries, and/or
**
**   * to read values that will be used to create keys that other
**     BTREE_FORDELETE cursors will seek to and delete.
**
** The BTREE_FORDELETE flag is an optimization hint.  It is not used by
** by this, the native b-tree engine of SQLite, but it is available to
** alternative storage engines that might be substituted in place of this
** b-tree system.  For alternative storage engines in which a delete of
** the main table row automatically deletes corresponding index rows,
** the FORDELETE flag hint allows those alternative storage engines to
** skip a lot of work.  Namely:  FORDELETE cursors may treat all SEEK
** and DELETE operations as no-ops, and any READ operation against a
** FORDELETE cursor may return a null row: 0x01 0x00.
*/
#define BTREE_WRCSR     0x00000004     /* read-write cursor */
#define BTREE_FORDELETE 0x00000008     /* Cursor is for seek/delete only */

SQLITE_PRIVATE int sqlite3BtreeCursor(
  Btree*,                              /* BTree containing table to open */
  int iTable,                          /* Index of root page */

  UnpackedRecord *pUnKey,
  i64 intKey,
  int bias,
  int *pRes
);
SQLITE_PRIVATE int sqlite3BtreeCursorHasMoved(BtCursor*);
SQLITE_PRIVATE int sqlite3BtreeCursorRestore(BtCursor*, int*);
SQLITE_PRIVATE int sqlite3BtreeDelete(BtCursor*, u8 flags);

/* Allowed flags for the 2nd argument to sqlite3BtreeDelete() */
#define BTREE_SAVEPOSITION 0x02  /* Leave cursor pointing at NEXT or PREV */
#define BTREE_AUXDELETE    0x04  /* not the primary delete operation */

SQLITE_PRIVATE int sqlite3BtreeInsert(BtCursor*, const void *pKey, i64 nKey,
                                  const void *pData, int nData,
                                  int nZero, int bias, int seekResult);
SQLITE_PRIVATE int sqlite3BtreeFirst(BtCursor*, int *pRes);
SQLITE_PRIVATE int sqlite3BtreeLast(BtCursor*, int *pRes);
SQLITE_PRIVATE int sqlite3BtreeNext(BtCursor*, int *pRes);
SQLITE_PRIVATE int sqlite3BtreeEof(BtCursor*);

** If we are not using shared cache, then there is no need to
** use mutexes to access the BtShared structures.  So make the
** Enter and Leave procedures no-ops.
*/
#ifndef SQLITE_OMIT_SHARED_CACHE
SQLITE_PRIVATE   void sqlite3BtreeEnter(Btree*);
SQLITE_PRIVATE   void sqlite3BtreeEnterAll(sqlite3*);
SQLITE_PRIVATE   int sqlite3BtreeSharable(Btree*);
SQLITE_PRIVATE   void sqlite3BtreeEnterCursor(BtCursor*);
#else
# define sqlite3BtreeEnter(X) 
# define sqlite3BtreeEnterAll(X)
# define sqlite3BtreeSharable(X) 0
# define sqlite3BtreeEnterCursor(X)
#endif

#if !defined(SQLITE_OMIT_SHARED_CACHE) && SQLITE_THREADSAFE

SQLITE_PRIVATE   void sqlite3BtreeLeave(Btree*);

SQLITE_PRIVATE   void sqlite3BtreeLeaveCursor(BtCursor*);
SQLITE_PRIVATE   void sqlite3BtreeLeaveAll(sqlite3*);
#ifndef NDEBUG
  /* These routines are used inside assert() statements only. */
SQLITE_PRIVATE   int sqlite3BtreeHoldsMutex(Btree*);
SQLITE_PRIVATE   int sqlite3BtreeHoldsAllMutexes(sqlite3*);
SQLITE_PRIVATE   int sqlite3SchemaMutexHeld(sqlite3*,int,Schema*);
#endif
#else


# define sqlite3BtreeLeave(X)

# define sqlite3BtreeLeaveCursor(X)
# define sqlite3BtreeLeaveAll(X)

# define sqlite3BtreeHoldsMutex(X) 1
# define sqlite3BtreeHoldsAllMutexes(X) 1
# define sqlite3SchemaMutexHeld(X,Y,Z) 1
#endif

** The makefile scans the vdbe.c source file and creates the "opcodes.h"
** header file that defines a number for each opcode used by the VDBE.
*/
/************** Include opcodes.h in the middle of vdbe.h ********************/
/************** Begin file opcodes.h *****************************************/
/* Automatically generated.  Do not edit */
/* See the tool/mkopcodeh.tcl script for details */
#define OP_Savepoint       0
#define OP_AutoCommit      1
#define OP_Transaction     2
#define OP_SorterNext      3
#define OP_PrevIfOpen      4
#define OP_NextIfOpen      5
#define OP_Prev            6
#define OP_Next            7
#define OP_Checkpoint      8
#define OP_JournalMode     9
#define OP_Vacuum         10
#define OP_VFilter        11 /* synopsis: iplan=r[P3] zplan='P4'           */
#define OP_VUpdate        12 /* synopsis: data=r[P3@P2]                    */
#define OP_Goto           13
#define OP_Gosub          14
#define OP_Return         15
#define OP_InitCoroutine  16
#define OP_EndCoroutine   17
#define OP_Yield          18
#define OP_Not            19 /* same as TK_NOT, synopsis: r[P2]= !r[P1]    */

#define OP_HaltIfNull     20 /* synopsis: if r[P3]=null halt               */
#define OP_Halt           21
#define OP_Integer        22 /* synopsis: r[P2]=P1                         */
#define OP_Int64          23 /* synopsis: r[P2]=P4                         */
#define OP_String         24 /* synopsis: r[P2]='P4' (len=P1)              */
#define OP_Null           25 /* synopsis: r[P2..P3]=NULL                   */
#define OP_SoftNull       26 /* synopsis: r[P1]=NULL                       */
#define OP_Blob           27 /* synopsis: r[P2]=P4 (len=P1)                */
#define OP_Variable       28 /* synopsis: r[P2]=parameter(P1,P4)           */
#define OP_Move           29 /* synopsis: r[P2@P3]=r[P1@P3]                */
#define OP_Copy           30 /* synopsis: r[P2@P3+1]=r[P1@P3+1]            */
#define OP_SCopy          31 /* synopsis: r[P2]=r[P1]                      */
#define OP_IntCopy        32 /* synopsis: r[P2]=r[P1]                      */
#define OP_ResultRow      33 /* synopsis: output=r[P1@P2]                  */
#define OP_CollSeq        34
#define OP_Function0      35 /* synopsis: r[P3]=func(r[P2@P5])             */
#define OP_Function       36 /* synopsis: r[P3]=func(r[P2@P5])             */
#define OP_AddImm         37 /* synopsis: r[P1]=r[P1]+P2                   */
#define OP_MustBeInt      38
#define OP_RealAffinity   39
#define OP_Cast           40 /* synopsis: affinity(r[P1])                  */
#define OP_Permutation    41
#define OP_Compare        42 /* synopsis: r[P1@P3] <-> r[P2@P3]            */
#define OP_Jump           43
#define OP_Once           44
#define OP_If             45
#define OP_IfNot          46
#define OP_Column         47 /* synopsis: r[P3]=PX                         */
#define OP_Affinity       48 /* synopsis: affinity(r[P1@P2])               */
#define OP_MakeRecord     49 /* synopsis: r[P3]=mkrec(r[P1@P2])            */
#define OP_Count          50 /* synopsis: r[P2]=count()                    */
#define OP_ReadCookie     51
#define OP_SetCookie      52
#define OP_ReopenIdx      53 /* synopsis: root=P2 iDb=P3                   */
#define OP_OpenRead       54 /* synopsis: root=P2 iDb=P3                   */
#define OP_OpenWrite      55 /* synopsis: root=P2 iDb=P3                   */
#define OP_OpenAutoindex  56 /* synopsis: nColumn=P2                       */
#define OP_OpenEphemeral  57 /* synopsis: nColumn=P2                       */
#define OP_SorterOpen     58
#define OP_SequenceTest   59 /* synopsis: if( cursor[P1].ctr++ ) pc = P2   */
#define OP_OpenPseudo     60 /* synopsis: P3 columns in r[P2]              */
#define OP_Close          61
#define OP_ColumnsUsed    62
#define OP_SeekLT         63 /* synopsis: key=r[P3@P4]                     */
#define OP_SeekLE         64 /* synopsis: key=r[P3@P4]                     */
#define OP_SeekGE         65 /* synopsis: key=r[P3@P4]                     */
#define OP_SeekGT         66 /* synopsis: key=r[P3@P4]                     */
#define OP_NoConflict     67 /* synopsis: key=r[P3@P4]                     */
#define OP_NotFound       68 /* synopsis: key=r[P3@P4]                     */
#define OP_Found          69 /* synopsis: key=r[P3@P4]                     */
#define OP_NotExists      70 /* synopsis: intkey=r[P3]                     */
#define OP_Or             71 /* same as TK_OR, synopsis: r[P3]=(r[P1] || r[P2]) */
#define OP_And            72 /* same as TK_AND, synopsis: r[P3]=(r[P1] && r[P2]) */


#define OP_Sequence       73 /* synopsis: r[P2]=cursor[P1].ctr++           */
#define OP_NewRowid       74 /* synopsis: r[P2]=rowid                      */
#define OP_Insert         75 /* synopsis: intkey=r[P3] data=r[P2]          */
#define OP_IsNull         76 /* same as TK_ISNULL, synopsis: if r[P1]==NULL goto P2 */
#define OP_NotNull        77 /* same as TK_NOTNULL, synopsis: if r[P1]!=NULL goto P2 */
#define OP_Ne             78 /* same as TK_NE, synopsis: if r[P1]!=r[P3] goto P2 */
#define OP_Eq             79 /* same as TK_EQ, synopsis: if r[P1]==r[P3] goto P2 */
#define OP_Gt             80 /* same as TK_GT, synopsis: if r[P1]>r[P3] goto P2 */
#define OP_Le             81 /* same as TK_LE, synopsis: if r[P1]<=r[P3] goto P2 */
#define OP_Lt             82 /* same as TK_LT, synopsis: if r[P1]<r[P3] goto P2 */
#define OP_Ge             83 /* same as TK_GE, synopsis: if r[P1]>=r[P3] goto P2 */
#define OP_InsertInt      84 /* synopsis: intkey=P3 data=r[P2]             */
#define OP_BitAnd         85 /* same as TK_BITAND, synopsis: r[P3]=r[P1]&r[P2] */
#define OP_BitOr          86 /* same as TK_BITOR, synopsis: r[P3]=r[P1]|r[P2] */
#define OP_ShiftLeft      87 /* same as TK_LSHIFT, synopsis: r[P3]=r[P2]<<r[P1] */
#define OP_ShiftRight     88 /* same as TK_RSHIFT, synopsis: r[P3]=r[P2]>>r[P1] */
#define OP_Add            89 /* same as TK_PLUS, synopsis: r[P3]=r[P1]+r[P2] */
#define OP_Subtract       90 /* same as TK_MINUS, synopsis: r[P3]=r[P2]-r[P1] */
#define OP_Multiply       91 /* same as TK_STAR, synopsis: r[P3]=r[P1]*r[P2] */
#define OP_Divide         92 /* same as TK_SLASH, synopsis: r[P3]=r[P2]/r[P1] */
#define OP_Remainder      93 /* same as TK_REM, synopsis: r[P3]=r[P2]%r[P1] */
#define OP_Concat         94 /* same as TK_CONCAT, synopsis: r[P3]=r[P2]+r[P1] */
#define OP_Delete         95
#define OP_BitNot         96 /* same as TK_BITNOT, synopsis: r[P1]= ~r[P1] */
#define OP_String8        97 /* same as TK_STRING, synopsis: r[P2]='P4'    */


#define OP_ResetCount     98
#define OP_SorterCompare  99 /* synopsis: if key(P1)!=trim(r[P3],P4) goto P2 */
#define OP_SorterData    100 /* synopsis: r[P2]=data                       */
#define OP_RowKey        101 /* synopsis: r[P2]=key                        */
#define OP_RowData       102 /* synopsis: r[P2]=data                       */
#define OP_Rowid         103 /* synopsis: r[P2]=rowid                      */
#define OP_NullRow       104
#define OP_Last          105
#define OP_SorterSort    106
#define OP_Sort          107
#define OP_Rewind        108
#define OP_SorterInsert  109
#define OP_IdxInsert     110 /* synopsis: key=r[P2]                        */
#define OP_IdxDelete     111 /* synopsis: key=r[P2@P3]                     */
#define OP_Seek          112 /* synopsis: Move P3 to P1.rowid              */
#define OP_IdxRowid      113 /* synopsis: r[P2]=rowid                      */
#define OP_IdxLE         114 /* synopsis: key=r[P3@P4]                     */
#define OP_IdxGT         115 /* synopsis: key=r[P3@P4]                     */
#define OP_IdxLT         116 /* synopsis: key=r[P3@P4]                     */
#define OP_IdxGE         117 /* synopsis: key=r[P3@P4]                     */
#define OP_Destroy       118
#define OP_Clear         119
#define OP_ResetSorter   120
#define OP_CreateIndex   121 /* synopsis: r[P2]=root iDb=P1                */
#define OP_CreateTable   122 /* synopsis: r[P2]=root iDb=P1                */
#define OP_ParseSchema   123
#define OP_LoadAnalysis  124
#define OP_DropTable     125
#define OP_DropIndex     126
#define OP_DropTrigger   127
#define OP_IntegrityCk   128
#define OP_RowSetAdd     129 /* synopsis: rowset(P1)=r[P2]                 */
#define OP_RowSetRead    130 /* synopsis: r[P3]=rowset(P1)                 */
#define OP_RowSetTest    131 /* synopsis: if r[P3] in rowset(P1) goto P2   */
#define OP_Program       132
#define OP_Real          133 /* same as TK_FLOAT, synopsis: r[P2]=P4       */

#define OP_Param         134
#define OP_FkCounter     135 /* synopsis: fkctr[P1]+=P2                    */
#define OP_FkIfZero      136 /* synopsis: if fkctr[P1]==0 goto P2          */
#define OP_MemMax        137 /* synopsis: r[P1]=max(r[P1],r[P2])           */
#define OP_IfPos         138 /* synopsis: if r[P1]>0 then r[P1]-=P3, goto P2 */
#define OP_OffsetLimit   139 /* synopsis: if r[P1]>0 then r[P2]=r[P1]+max(0,r[P3]) else r[P2]=(-1) */
#define OP_IfNotZero     140 /* synopsis: if r[P1]!=0 then r[P1]-=P3, goto P2 */
#define OP_DecrJumpZero  141 /* synopsis: if (--r[P1])==0 goto P2          */
#define OP_JumpZeroIncr  142 /* synopsis: if (r[P1]++)==0 ) goto P2        */
#define OP_AggStep0      143 /* synopsis: accum=r[P3] step(r[P2@P5])       */
#define OP_AggStep       144 /* synopsis: accum=r[P3] step(r[P2@P5])       */
#define OP_AggFinal      145 /* synopsis: accum=r[P1] N=P2                 */
#define OP_IncrVacuum    146
#define OP_Expire        147
#define OP_TableLock     148 /* synopsis: iDb=P1 root=P2 write=P3          */
#define OP_VBegin        149
#define OP_VCreate       150
#define OP_VDestroy      151
#define OP_VOpen         152
#define OP_VColumn       153 /* synopsis: r[P3]=vcolumn(P2)                */
#define OP_VNext         154
#define OP_VRename       155
#define OP_Pagecount     156
#define OP_MaxPgcnt      157
#define OP_Init          158 /* synopsis: Start at P2                      */
#define OP_CursorHint    159
#define OP_Noop          160
#define OP_Explain       161

/* Properties such as "out2" or "jump" that are specified in
** comments following the "case" for each opcode in the vdbe.c
** are encoded into bitvectors as follows:
*/
#define OPFLG_JUMP        0x01  /* jump:  P2 holds jmp target */
#define OPFLG_IN1         0x02  /* in1:   P1 is an input */
#define OPFLG_IN2         0x04  /* in2:   P2 is an input */
#define OPFLG_IN3         0x08  /* in3:   P3 is an input */
#define OPFLG_OUT2        0x10  /* out2:  P2 is an output */
#define OPFLG_OUT3        0x20  /* out3:  P3 is an output */
#define OPFLG_INITIALIZER {\
/*   0 */ 0x00, 0x00, 0x00, 0x01, 0x01, 0x01, 0x01, 0x01,\
/*   8 */ 0x00, 0x10, 0x00, 0x01, 0x00, 0x01, 0x01, 0x02,\
/*  16 */ 0x01, 0x02, 0x03, 0x12, 0x08, 0x00, 0x10, 0x10,\
/*  24 */ 0x10, 0x10, 0x00, 0x10, 0x10, 0x00, 0x00, 0x10,\
/*  32 */ 0x10, 0x00, 0x00, 0x00, 0x00, 0x02, 0x03, 0x02,\
/*  40 */ 0x02, 0x00, 0x00, 0x01, 0x01, 0x03, 0x03, 0x00,\
/*  48 */ 0x00, 0x00, 0x10, 0x10, 0x00, 0x00, 0x00, 0x00,\
/*  56 */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x09,\
/*  64 */ 0x09, 0x09, 0x09, 0x09, 0x09, 0x09, 0x09, 0x26,\
/*  72 */ 0x26, 0x10, 0x10, 0x00, 0x03, 0x03, 0x0b, 0x0b,\
/*  80 */ 0x0b, 0x0b, 0x0b, 0x0b, 0x00, 0x26, 0x26, 0x26,\
/*  88 */ 0x26, 0x26, 0x26, 0x26, 0x26, 0x26, 0x26, 0x00,\
/*  96 */ 0x12, 0x10, 0x00, 0x00, 0x00, 0x00, 0x00, 0x10,\
/* 104 */ 0x00, 0x01, 0x01, 0x01, 0x01, 0x04, 0x04, 0x00,\
/* 112 */ 0x00, 0x10, 0x01, 0x01, 0x01, 0x01, 0x10, 0x00,\
/* 120 */ 0x00, 0x10, 0x10, 0x00, 0x00, 0x00, 0x00, 0x00,\
/* 128 */ 0x00, 0x06, 0x23, 0x0b, 0x01, 0x10, 0x10, 0x00,\
/* 136 */ 0x01, 0x04, 0x03, 0x1a, 0x03, 0x03, 0x03, 0x00,\
/* 144 */ 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00,\
/* 152 */ 0x00, 0x00, 0x01, 0x00, 0x10, 0x10, 0x01, 0x00,\
/* 160 */ 0x00, 0x00,}

/************** End of opcodes.h *********************************************/
/************** Continuing where we left off in vdbe.h ***********************/

/*
** Prototypes for the VDBE interface.  See comments on the implementation
** for a description of what each of these routines does.
*/
SQLITE_PRIVATE Vdbe *sqlite3VdbeCreate(Parse*);
SQLITE_PRIVATE int sqlite3VdbeAddOp0(Vdbe*,int);
SQLITE_PRIVATE int sqlite3VdbeAddOp1(Vdbe*,int,int);
SQLITE_PRIVATE int sqlite3VdbeAddOp2(Vdbe*,int,int,int);
SQLITE_PRIVATE int sqlite3VdbeGoto(Vdbe*,int);
SQLITE_PRIVATE int sqlite3VdbeLoadString(Vdbe*,int,const char*);
SQLITE_PRIVATE void sqlite3VdbeMultiLoad(Vdbe*,int,const char*,...);
SQLITE_PRIVATE int sqlite3VdbeAddOp3(Vdbe*,int,int,int,int);
SQLITE_PRIVATE int sqlite3VdbeAddOp4(Vdbe*,int,int,int,int,const char *zP4,int);
SQLITE_PRIVATE int sqlite3VdbeAddOp4Dup8(Vdbe*,int,int,int,int,const u8*,int);
SQLITE_PRIVATE int sqlite3VdbeAddOp4Int(Vdbe*,int,int,int,int,int);
SQLITE_PRIVATE void sqlite3VdbeEndCoroutine(Vdbe*,int);
#if defined(SQLITE_DEBUG) && !defined(SQLITE_TEST_REALLOC_STRESS)
SQLITE_PRIVATE   void sqlite3VdbeVerifyNoMallocRequired(Vdbe *p, int N);
#else
# define sqlite3VdbeVerifyNoMallocRequired(A,B)
#endif
SQLITE_PRIVATE VdbeOp *sqlite3VdbeAddOpList(Vdbe*, int nOp, VdbeOpList const *aOp, int iLineno);
SQLITE_PRIVATE void sqlite3VdbeAddParseSchemaOp(Vdbe*,int,char*);
SQLITE_PRIVATE void sqlite3VdbeChangeOpcode(Vdbe*, u32 addr, u8);
SQLITE_PRIVATE void sqlite3VdbeChangeP1(Vdbe*, u32 addr, int P1);
SQLITE_PRIVATE void sqlite3VdbeChangeP2(Vdbe*, u32 addr, int P2);
SQLITE_PRIVATE void sqlite3VdbeChangeP3(Vdbe*, u32 addr, int P3);
SQLITE_PRIVATE void sqlite3VdbeChangeP5(Vdbe*, u8 P5);
SQLITE_PRIVATE void sqlite3VdbeJumpHere(Vdbe*, int addr);
SQLITE_PRIVATE int sqlite3VdbeChangeToNoop(Vdbe*, int addr);
SQLITE_PRIVATE int sqlite3VdbeDeletePriorOpcode(Vdbe*, u8 op);
SQLITE_PRIVATE void sqlite3VdbeChangeP4(Vdbe*, int addr, const char *zP4, int N);
SQLITE_PRIVATE void sqlite3VdbeSetP4KeyInfo(Parse*, Index*);
SQLITE_PRIVATE void sqlite3VdbeUsesBtree(Vdbe*, int);
SQLITE_PRIVATE VdbeOp *sqlite3VdbeGetOp(Vdbe*, int);
SQLITE_PRIVATE int sqlite3VdbeMakeLabel(Vdbe*);
SQLITE_PRIVATE void sqlite3VdbeRunOnlyOnce(Vdbe*);

/*
** Flags for sqlite3PagerSetFlags()
*/
#define PAGER_SYNCHRONOUS_OFF       0x01  /* PRAGMA synchronous=OFF */
#define PAGER_SYNCHRONOUS_NORMAL    0x02  /* PRAGMA synchronous=NORMAL */
#define PAGER_SYNCHRONOUS_FULL      0x03  /* PRAGMA synchronous=FULL */
#define PAGER_SYNCHRONOUS_EXTRA     0x04  /* PRAGMA synchronous=EXTRA */
#define PAGER_SYNCHRONOUS_MASK      0x07  /* Mask for four values above */
#define PAGER_FULLFSYNC             0x08  /* PRAGMA fullfsync=ON */
#define PAGER_CKPT_FULLFSYNC        0x10  /* PRAGMA checkpoint_fullfsync=ON */
#define PAGER_CACHESPILL            0x20  /* PRAGMA cache_spill=ON */
#define PAGER_FLAGS_MASK            0x38  /* All above except SYNCHRONOUS */

/*
** The remainder of this file contains the declarations of the functions
** that make up the Pager sub-system API. See source code comments for 
** a detailed description of each routine.
*/

#define PGHDR_DIRTY           0x002  /* Page is on the PCache.pDirty list */
#define PGHDR_WRITEABLE       0x004  /* Journaled and ready to modify */
#define PGHDR_NEED_SYNC       0x008  /* Fsync the rollback journal before
                                     ** writing this page to the database */
#define PGHDR_NEED_READ       0x010  /* Content is unread */
#define PGHDR_DONT_WRITE      0x020  /* Do not write content to disk */
#define PGHDR_MMAP            0x040  /* This is an mmap page object */

#define PGHDR_WAL_APPEND      0x080  /* Appended to wal file */

/* Initialize and shutdown the page cache subsystem */
SQLITE_PRIVATE int sqlite3PcacheInitialize(void);
SQLITE_PRIVATE void sqlite3PcacheShutdown(void);

/* Page cache buffer management:
** These routines implement SQLITE_CONFIG_PAGECACHE.

** with a particular database connection.  Hence, schema information cannot
** be stored in lookaside because in shared cache mode the schema information
** is shared by multiple database connections.  Therefore, while parsing
** schema information, the Lookaside.bEnabled flag is cleared so that
** lookaside allocations are not used to construct the schema objects.
*/
struct Lookaside {
  u32 bDisable;           /* Only operate the lookaside when zero */
  u16 sz;                 /* Size of each buffer in bytes */

  u8 bMalloced;           /* True if pStart obtained from sqlite3_malloc() */
  int nOut;               /* Number of buffers currently checked out */
  int mxOut;              /* Highwater mark for nOut */
  int anStat[3];          /* 0: hits.  1: size misses.  2: full misses */
  LookasideSlot *pFree;   /* List of available buffers */
  void *pStart;           /* First byte of available memory space */
  void *pEnd;             /* First byte past end of available space */

  int errCode;                  /* Most recent error code (SQLITE_*) */
  int errMask;                  /* & result codes with this before returning */
  u16 dbOptFlags;               /* Flags to enable/disable optimizations */
  u8 enc;                       /* Text encoding */
  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 bBenignMalloc;             /* Do not require OOMs if true */
  u8 dfltLockMode;              /* Default locking-mode for attached dbs */
  signed char nextAutovac;      /* Autovac setting after VACUUM if >=0 */
  u8 suppressErr;               /* Do not issue error messages if true */
  u8 vtabOnConflict;            /* Value to return for s3_vtab_on_conflict() */
  u8 isTransactionSavepoint;    /* True if the outermost savepoint is a TS */
  int nextPagesize;             /* Pagesize after VACUUM if >0 */
  u32 magic;                    /* Magic number for detect library misuse */

#define ENC(db)        ((db)->enc)

/*
** Possible values for the sqlite3.flags.
*/
#define SQLITE_VdbeTrace      0x00000001  /* True to trace VDBE execution */
#define SQLITE_InternChanges  0x00000002  /* Uncommitted Hash table changes */
#define SQLITE_FullColNames   0x00000004  /* Show full column names on SELECT */
#define SQLITE_FullFSync      0x00000008  /* Use full fsync on the backend */
#define SQLITE_CkptFullFSync  0x00000010  /* Use full fsync for checkpoint */
#define SQLITE_CacheSpill     0x00000020  /* OK to spill pager cache */

#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 */

** points to a linked list of these structures.
*/
struct FuncDef {
  i16 nArg;            /* Number of arguments.  -1 means unlimited */
  u16 funcFlags;       /* Some combination of SQLITE_FUNC_* */
  void *pUserData;     /* User data parameter */
  FuncDef *pNext;      /* Next function with same name */
  void (*xSFunc)(sqlite3_context*,int,sqlite3_value**); /* func or agg-step */

  void (*xFinalize)(sqlite3_context*);                  /* Agg finalizer */
  char *zName;         /* SQL name of the function. */
  FuncDef *pHash;      /* Next with a different name but the same hash */
  FuncDestructor *pDestructor;   /* Reference counted destructor function */
};

/*
** This structure encapsulates a user-function destructor callback (as

**     function likeFunc. Argument pArg is cast to a (void *) and made
**     available as the function user-data (sqlite3_user_data()). The
**     FuncDef.flags variable is set to the value passed as the flags
**     parameter.
*/
#define FUNCTION(zName, nArg, iArg, bNC, xFunc) \
  {nArg, SQLITE_FUNC_CONSTANT|SQLITE_UTF8|(bNC*SQLITE_FUNC_NEEDCOLL), \
   SQLITE_INT_TO_PTR(iArg), 0, xFunc, 0, #zName, 0, 0}
#define VFUNCTION(zName, nArg, iArg, bNC, xFunc) \
  {nArg, SQLITE_UTF8|(bNC*SQLITE_FUNC_NEEDCOLL), \
   SQLITE_INT_TO_PTR(iArg), 0, xFunc, 0, #zName, 0, 0}
#define DFUNCTION(zName, nArg, iArg, bNC, xFunc) \
  {nArg, SQLITE_FUNC_SLOCHNG|SQLITE_UTF8|(bNC*SQLITE_FUNC_NEEDCOLL), \
   SQLITE_INT_TO_PTR(iArg), 0, xFunc, 0, #zName, 0, 0}
#define FUNCTION2(zName, nArg, iArg, bNC, xFunc, extraFlags) \
  {nArg,SQLITE_FUNC_CONSTANT|SQLITE_UTF8|(bNC*SQLITE_FUNC_NEEDCOLL)|extraFlags,\
   SQLITE_INT_TO_PTR(iArg), 0, xFunc, 0, #zName, 0, 0}
#define STR_FUNCTION(zName, nArg, pArg, bNC, xFunc) \
  {nArg, SQLITE_FUNC_SLOCHNG|SQLITE_UTF8|(bNC*SQLITE_FUNC_NEEDCOLL), \
   pArg, 0, xFunc, 0, #zName, 0, 0}
#define LIKEFUNC(zName, nArg, arg, flags) \
  {nArg, SQLITE_FUNC_CONSTANT|SQLITE_UTF8|flags, \
   (void *)arg, 0, likeFunc, 0, #zName, 0, 0}
#define AGGREGATE(zName, nArg, arg, nc, xStep, xFinal) \
  {nArg, SQLITE_UTF8|(nc*SQLITE_FUNC_NEEDCOLL), \
   SQLITE_INT_TO_PTR(arg), 0, xStep,xFinal,#zName,0,0}
#define AGGREGATE2(zName, nArg, arg, nc, xStep, xFinal, extraFlags) \
  {nArg, SQLITE_UTF8|(nc*SQLITE_FUNC_NEEDCOLL)|extraFlags, \
   SQLITE_INT_TO_PTR(arg), 0, xStep,xFinal,#zName,0,0}

/*
** All current savepoints are stored in a linked list starting at
** sqlite3.pSavepoint. The first element in the list is the most recently
** opened savepoint. Savepoints are added to the list by the vdbe
** OP_Savepoint instruction.
*/

};

/*
** During code generation of statements that do inserts into AUTOINCREMENT 
** tables, the following information is attached to the Table.u.autoInc.p
** pointer of each autoincrement table to record some side information that
** the code generator needs.  We have to keep per-table autoincrement
** information in case inserts are done within triggers.  Triggers do not
** normally coordinate their activities, but we do need to coordinate the
** loading and saving of autoincrement information.
*/
struct AutoincInfo {
  AutoincInfo *pNext;   /* Next info block in a list of them all */
  Table *pTab;          /* Table this info block refers to */
  int iDb;              /* Index in sqlite3.aDb[] of database holding pTab */

  u8 checkSchema;      /* Causes schema cookie check after an error */
  u8 nested;           /* Number of nested calls to the parser/code generator */
  u8 nTempReg;         /* Number of temporary registers in aTempReg[] */
  u8 isMultiWrite;     /* True if statement may modify/insert multiple rows */
  u8 mayAbort;         /* True if statement may throw an ABORT exception */
  u8 hasCompound;      /* Need to invoke convertCompoundSelectToSubquery() */
  u8 okConstFactor;    /* OK to factor out constants */
  u8 disableLookaside; /* Number of times lookaside has been disabled */
  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 */

  /************************************************************************
  ** Above is constant between recursions.  Below is reset before and after
  ** each recursion.  The boundary between these two regions is determined
  ** using offsetof(Parse,nVar) so the nVar field must be the first field
  ** in the recursive region.
  ************************************************************************/

  ynVar nVar;               /* Number of '?' variables seen in the SQL so far */
  int nzVar;                /* Number of available slots in azVar[] */
  u8 iPkSortOrder;          /* ASC or DESC for INTEGER PRIMARY KEY */
  u8 explain;               /* True if the EXPLAIN flag is found on the query */
#ifndef SQLITE_OMIT_VIRTUALTABLE
  u8 declareVtab;           /* True if inside sqlite3_declare_vtab() */
  int nVtabLock;            /* Number of virtual tables to lock */
#endif

  const char *zAuthContext;   /* Put saved Parse.zAuthContext here */
  Parse *pParse;              /* The Parse structure */
};

/*
** Bitfield flags for P5 value in various opcodes.
*/
#define OPFLAG_NCHANGE       0x01    /* OP_Insert: Set to update db->nChange */
                                     /* Also used in P2 (not P5) of OP_Delete */
#define OPFLAG_EPHEM         0x01    /* OP_Column: Ephemeral output is ok */
#define OPFLAG_LASTROWID     0x02    /* Set to update db->lastRowid */
#define OPFLAG_ISUPDATE      0x04    /* This OP_Insert is an sql UPDATE */
#define OPFLAG_APPEND        0x08    /* This is likely to be an append */
#define OPFLAG_USESEEKRESULT 0x10    /* Try to avoid a seek in BtreeInsert() */
#define OPFLAG_LENGTHARG     0x40    /* OP_Column only used for length() */
#define OPFLAG_TYPEOFARG     0x80    /* OP_Column only used for typeof() */
#define OPFLAG_BULKCSR       0x01    /* OP_Open** used to open bulk cursor */
#define OPFLAG_SEEKEQ        0x02    /* OP_Open** cursor uses EQ seek only */
#define OPFLAG_FORDELETE     0x08    /* OP_Open should use BTREE_FORDELETE */
#define OPFLAG_P2ISREG       0x10    /* P2 to OP_Open** is a register number */
#define OPFLAG_PERMUTE       0x01    /* OP_Compare: use the permutation */
#define OPFLAG_SAVEPOSITION  0x02    /* OP_Delete: keep cursor position */
#define OPFLAG_AUXDELETE     0x04    /* OP_Delete: index in a DELETE op */

/*
 * 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 

  sqlite3 *db;         /* Optional database for lookaside.  Can be NULL */
  char *zBase;         /* A base allocation.  Not from malloc. */
  char *zText;         /* The string collected so far */
  u32  nChar;          /* Length of the string so far */
  u32  nAlloc;         /* Amount of space allocated in zText */
  u32  mxAlloc;        /* Maximum allowed allocation.  0 for no malloc usage */
  u8   accError;       /* STRACCUM_NOMEM or STRACCUM_TOOBIG */
  u8   printfFlags;    /* SQLITE_PRINTF flags below */
};
#define STRACCUM_NOMEM   1
#define STRACCUM_TOOBIG  2
#define SQLITE_PRINTF_INTERNAL 0x01  /* Internal-use-only converters allowed */
#define SQLITE_PRINTF_SQLFUNC  0x02  /* SQL function arguments to VXPrintf */
#define SQLITE_PRINTF_MALLOCED 0x04  /* True if xText is allocated space */

#define isMalloced(X)  (((X)->printfFlags & SQLITE_PRINTF_MALLOCED)!=0)


/*
** 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 */

*/
#define CORRUPT_DB  (sqlite3Config.neverCorrupt==0)

/*
** Context pointer passed down through the tree-walk.
*/
struct Walker {
  Parse *pParse;                            /* Parser context.  */
  int (*xExprCallback)(Walker*, Expr*);     /* Callback for expressions */
  int (*xSelectCallback)(Walker*,Select*);  /* Callback for SELECTs */
  void (*xSelectCallback2)(Walker*,Select*);/* Second callback for SELECTs */

  int walkerDepth;                          /* Number of subqueries */
  u8 eCode;                                 /* A small processing code */
  union {                                   /* Extra data for callback */
    NameContext *pNC;                          /* Naming context */
    int n;                                     /* A counter */
    int iCur;                                  /* A cursor number */
    SrcList *pSrcList;                         /* FROM clause */
    struct SrcCount *pSrcCount;                /* Counting column references */
    struct CCurHint *pCCurHint;                /* Used by codeCursorHint() */
    int *aiCol;                                /* array of column indexes */
  } u;
};

/* Forward declarations */
SQLITE_PRIVATE int sqlite3WalkExpr(Walker*, Expr*);
SQLITE_PRIVATE int sqlite3WalkExprList(Walker*, ExprList*);
SQLITE_PRIVATE int sqlite3WalkSelect(Walker*, Select*);

SQLITE_PRIVATE int sqlite3CorruptError(int);
SQLITE_PRIVATE int sqlite3MisuseError(int);
SQLITE_PRIVATE int sqlite3CantopenError(int);
#define SQLITE_CORRUPT_BKPT sqlite3CorruptError(__LINE__)
#define SQLITE_MISUSE_BKPT sqlite3MisuseError(__LINE__)
#define SQLITE_CANTOPEN_BKPT sqlite3CantopenError(__LINE__)

/*
** FTS3 and FTS4 both require virtual table support
*/
#if defined(SQLITE_OMIT_VIRTUALTABLE)
# undef SQLITE_ENABLE_FTS3
# undef SQLITE_ENABLE_FTS4
#endif

/*
** FTS4 is really an extension for FTS3.  It is enabled using the
** SQLITE_ENABLE_FTS3 macro.  But to avoid confusion we also call
** the SQLITE_ENABLE_FTS4 macro to serve as an alias for SQLITE_ENABLE_FTS3.
*/
#if defined(SQLITE_ENABLE_FTS4) && !defined(SQLITE_ENABLE_FTS3)

SQLITE_PRIVATE int sqlite3MallocInit(void);
SQLITE_PRIVATE void sqlite3MallocEnd(void);
SQLITE_PRIVATE void *sqlite3Malloc(u64);
SQLITE_PRIVATE void *sqlite3MallocZero(u64);
SQLITE_PRIVATE void *sqlite3DbMallocZero(sqlite3*, u64);
SQLITE_PRIVATE void *sqlite3DbMallocRaw(sqlite3*, u64);
SQLITE_PRIVATE void *sqlite3DbMallocRawNN(sqlite3*, u64);
SQLITE_PRIVATE char *sqlite3DbStrDup(sqlite3*,const char*);
SQLITE_PRIVATE char *sqlite3DbStrNDup(sqlite3*,const char*, u64);
SQLITE_PRIVATE void *sqlite3Realloc(void*, u64);
SQLITE_PRIVATE void *sqlite3DbReallocOrFree(sqlite3 *, void *, u64);
SQLITE_PRIVATE void *sqlite3DbRealloc(sqlite3 *, void *, u64);
SQLITE_PRIVATE void sqlite3DbFree(sqlite3*, void*);
SQLITE_PRIVATE int sqlite3MallocSize(void*);

*/
struct PrintfArguments {
  int nArg;                /* Total number of arguments */
  int nUsed;               /* Number of arguments used so far */
  sqlite3_value **apArg;   /* The argument values */
};



SQLITE_PRIVATE void sqlite3VXPrintf(StrAccum*, const char*, va_list);
SQLITE_PRIVATE void sqlite3XPrintf(StrAccum*, const char*, ...);
SQLITE_PRIVATE char *sqlite3MPrintf(sqlite3*,const char*, ...);
SQLITE_PRIVATE char *sqlite3VMPrintf(sqlite3*,const char*, va_list);
#if defined(SQLITE_DEBUG) || defined(SQLITE_HAVE_OS_TRACE)
SQLITE_PRIVATE   void sqlite3DebugPrintf(const char*, ...);
#endif
#if defined(SQLITE_TEST)
SQLITE_PRIVATE   void *sqlite3TestTextToPtr(const char*);
#endif

#if defined(SQLITE_DEBUG)
SQLITE_PRIVATE   void sqlite3TreeViewExpr(TreeView*, const Expr*, u8);
SQLITE_PRIVATE   void sqlite3TreeViewExprList(TreeView*, const ExprList*, u8, const char*);
SQLITE_PRIVATE   void sqlite3TreeViewSelect(TreeView*, const Select*, u8);
SQLITE_PRIVATE   void sqlite3TreeViewWith(TreeView*, const With*, u8);
#endif


SQLITE_PRIVATE void sqlite3SetString(char **, sqlite3*, const char*);
SQLITE_PRIVATE void sqlite3ErrorMsg(Parse*, const char*, ...);
SQLITE_PRIVATE int sqlite3Dequote(char*);
SQLITE_PRIVATE void sqlite3TokenInit(Token*,char*);
SQLITE_PRIVATE int sqlite3KeywordCode(const unsigned char*, int);
SQLITE_PRIVATE int sqlite3RunParser(Parse*, const char*, char **);
SQLITE_PRIVATE void sqlite3FinishCoding(Parse*);
SQLITE_PRIVATE int sqlite3GetTempReg(Parse*);
SQLITE_PRIVATE void sqlite3ReleaseTempReg(Parse*,int);
SQLITE_PRIVATE int sqlite3GetTempRange(Parse*,int);
SQLITE_PRIVATE void sqlite3ReleaseTempRange(Parse*,int,int);

SQLITE_PRIVATE u32 sqlite3ExprListFlags(const ExprList*);
SQLITE_PRIVATE int sqlite3Init(sqlite3*, char**);
SQLITE_PRIVATE int sqlite3InitCallback(void*, int, char**, char**);
SQLITE_PRIVATE void sqlite3Pragma(Parse*,Token*,Token*,Token*,int);
SQLITE_PRIVATE void sqlite3ResetAllSchemasOfConnection(sqlite3*);
SQLITE_PRIVATE void sqlite3ResetOneSchema(sqlite3*,int);
SQLITE_PRIVATE void sqlite3CollapseDatabaseArray(sqlite3*);

SQLITE_PRIVATE void sqlite3CommitInternalChanges(sqlite3*);
SQLITE_PRIVATE void sqlite3DeleteColumnNames(sqlite3*,Table*);
SQLITE_PRIVATE int sqlite3ColumnsFromExprList(Parse*,ExprList*,i16*,Column**);
SQLITE_PRIVATE Table *sqlite3ResultSetOfSelect(Parse*,Select*);
SQLITE_PRIVATE void sqlite3OpenMasterTable(Parse *, int);
SQLITE_PRIVATE Index *sqlite3PrimaryKeyIndex(Table*);
SQLITE_PRIVATE i16 sqlite3ColumnOfIndex(Index*, i16);

SQLITE_PRIVATE int sqlite3IsRowid(const char*);
SQLITE_PRIVATE void sqlite3GenerateRowDelete(
    Parse*,Table*,Trigger*,int,int,int,i16,u8,u8,u8,int);
SQLITE_PRIVATE void sqlite3GenerateRowIndexDelete(Parse*, Table*, int, int, int*, int);
SQLITE_PRIVATE int sqlite3GenerateIndexKey(Parse*, Index*, int, int, int, int*,Index*,int);
SQLITE_PRIVATE void sqlite3ResolvePartIdxLabel(Parse*,int);
SQLITE_PRIVATE void sqlite3GenerateConstraintChecks(Parse*,Table*,int*,int,int,int,int,
                                     u8,u8,int,int*,int*);
SQLITE_PRIVATE void sqlite3CompleteInsertion(Parse*,Table*,int,int,int,int*,int,int,int);
SQLITE_PRIVATE int sqlite3OpenTableAndIndices(Parse*, Table*, int, u8, int, u8*, int*, int*);
SQLITE_PRIVATE void sqlite3BeginWriteOperation(Parse*, int, int);
SQLITE_PRIVATE void sqlite3MultiWrite(Parse*);
SQLITE_PRIVATE void sqlite3MayAbort(Parse*);
SQLITE_PRIVATE void sqlite3HaltConstraint(Parse*, int, int, char*, i8, u8);
SQLITE_PRIVATE void sqlite3UniqueConstraint(Parse*, int, Index*);

SQLITE_PRIVATE int sqlite3FindDb(sqlite3*, Token*);
SQLITE_PRIVATE int sqlite3FindDbName(sqlite3 *, const char *);
SQLITE_PRIVATE int sqlite3AnalysisLoad(sqlite3*,int iDB);
SQLITE_PRIVATE void sqlite3DeleteIndexSamples(sqlite3*,Index*);
SQLITE_PRIVATE void sqlite3DefaultRowEst(Index*);
SQLITE_PRIVATE void sqlite3RegisterLikeFunctions(sqlite3*, int);
SQLITE_PRIVATE int sqlite3IsLikeFunction(sqlite3*,Expr*,int*,char*);

SQLITE_PRIVATE void sqlite3SchemaClear(void *);
SQLITE_PRIVATE Schema *sqlite3SchemaGet(sqlite3 *, Btree *);
SQLITE_PRIVATE int sqlite3SchemaToIndex(sqlite3 *db, Schema *);
SQLITE_PRIVATE KeyInfo *sqlite3KeyInfoAlloc(sqlite3*,int,int);
SQLITE_PRIVATE void sqlite3KeyInfoUnref(KeyInfo*);
SQLITE_PRIVATE KeyInfo *sqlite3KeyInfoRef(KeyInfo*);
SQLITE_PRIVATE KeyInfo *sqlite3KeyInfoOfIndex(Parse*, Index*);
#ifdef SQLITE_DEBUG
SQLITE_PRIVATE int sqlite3KeyInfoIsWriteable(KeyInfo*);
#endif
SQLITE_PRIVATE int sqlite3CreateFunc(sqlite3 *, const char *, int, int, void *, 
  void (*)(sqlite3_context*,int,sqlite3_value **),
  void (*)(sqlite3_context*,int,sqlite3_value **), void (*)(sqlite3_context*),
  FuncDestructor *pDestructor
);
SQLITE_PRIVATE void sqlite3OomFault(sqlite3*);
SQLITE_PRIVATE void sqlite3OomClear(sqlite3*);
SQLITE_PRIVATE int sqlite3ApiExit(sqlite3 *db, int);
SQLITE_PRIVATE int sqlite3OpenTempDatabase(Parse *);

SQLITE_PRIVATE void sqlite3StrAccumInit(StrAccum*, sqlite3*, char*, int, int);
SQLITE_PRIVATE void sqlite3StrAccumAppend(StrAccum*,const char*,int);
SQLITE_PRIVATE void sqlite3StrAccumAppendAll(StrAccum*,const char*);
SQLITE_PRIVATE void sqlite3AppendChar(StrAccum*,int,char);

**      * A b-tree cursor
**          -  In the main database or in an ephemeral database
**          -  On either an index or a table
**      * A sorter
**      * A virtual table
**      * A one-row "pseudotable" stored in a single register
*/
typedef struct VdbeCursor VdbeCursor;
struct VdbeCursor {
  u8 eCurType;          /* One of the CURTYPE_* values above */
  i8 iDb;               /* Index of cursor database in db->aDb[] (or -1) */
  u8 nullRow;           /* True if pointing to a row with no data */
  u8 deferredMoveto;    /* A call to sqlite3BtreeMoveto() is needed */
  u8 isTable;           /* True for rowid tables.  False for indexes */
#ifdef SQLITE_DEBUG
  u8 seekOp;            /* Most recent seek operation on this cursor */
  u8 wrFlag;            /* The wrFlag argument to sqlite3BtreeCursor() */
#endif
  Bool isEphemeral:1;   /* True for an ephemeral table */
  Bool useRandomRowid:1;/* Generate new record numbers semi-randomly */
  Bool isOrdered:1;     /* True if the underlying table is BTREE_UNORDERED */
  Pgno pgnoRoot;        /* Root page of the open btree cursor */
  i16 nField;           /* Number of fields in the header */
  u16 nHdrParsed;       /* Number of header fields parsed so far */
  union {
    BtCursor *pCursor;          /* CURTYPE_BTREE.  Btree cursor */
    sqlite3_vtab_cursor *pVCur; /* CURTYPE_VTAB.   Vtab cursor */
    int pseudoTableReg;         /* CURTYPE_PSEUDO. Reg holding content. */
    VdbeSorter *pSorter;        /* CURTYPE_SORTER. Sorter object */
  } uc;
  Btree *pBt;           /* Separate file holding temporary table */
  KeyInfo *pKeyInfo;    /* Info about index keys needed by index cursors */
  int seekResult;       /* Result of previous sqlite3BtreeMoveto() */
  i64 seqCount;         /* Sequence counter */
  i64 movetoTarget;     /* Argument to the deferred sqlite3BtreeMoveto() */
  VdbeCursor *pAltCursor; /* Associated index cursor from which to read */
  int *aAltMap;           /* Mapping from table to index column numbers */
#ifdef SQLITE_ENABLE_COLUMN_USED_MASK
  u64 maskUsed;         /* Mask of columns used by this cursor */
#endif

  /* Cached information about the header for the data record that the
  ** cursor is currently pointing to.  Only valid if cacheStatus matches
  ** Vdbe.cacheCtr.  Vdbe.cacheCtr will never take on the value of

  const u8 *aRow;       /* Data for the current row, if all on one page */
  u32 *aOffset;         /* Pointer to aType[nField] */
  u32 aType[1];         /* Type values for all entries in the record */
  /* 2*nField extra array elements allocated for aType[], beyond the one
  ** static element declared in the structure.  nField total array slots for
  ** aType[] and nField+1 array slots for aOffset[] */
};


/*
** When a sub-program is executed (OP_Program), a structure of this type
** is allocated to store the current value of the program counter, as
** well as the current memory cell array and various other frame specific
** values stored in the Vdbe struct. When the sub-program is finished, 
** these values are copied back to the Vdbe from the VdbeFrame structure,

#define MEM_Real      0x0008   /* Value is a real number */
#define MEM_Blob      0x0010   /* Value is a BLOB */
#define MEM_AffMask   0x001f   /* Mask of affinity bits */
#define MEM_RowSet    0x0020   /* Value is a RowSet object */
#define MEM_Frame     0x0040   /* Value is a VdbeFrame object */
#define MEM_Undefined 0x0080   /* Value is undefined */
#define MEM_Cleared   0x0100   /* NULL set by OP_Null, not from data */
#define MEM_TypeMask  0x81ff   /* Mask of type bits */


/* Whenever Mem contains a valid string or blob representation, one of
** the following flags must be set to determine the memory management
** policy for Mem.z.  The MEM_Term flag tells us whether or not the
** string is \000 or \u0000 terminated
*/
#define MEM_Term      0x0200   /* String rep is nul terminated */
#define MEM_Dyn       0x0400   /* Need to call Mem.xDel() on Mem.z */
#define MEM_Static    0x0800   /* Mem.z points to a static string */
#define MEM_Ephem     0x1000   /* Mem.z points to an ephemeral string */
#define MEM_Agg       0x2000   /* Mem.z points to an agg function context */
#define MEM_Zero      0x4000   /* Mem.i contains count of 0s appended to blob */
#define MEM_Subtype   0x8000   /* Mem.eSubtype is valid */
#ifdef SQLITE_OMIT_INCRBLOB
  #undef MEM_Zero
  #define MEM_Zero 0x0000
#endif

/* Return TRUE if Mem X contains dynamically allocated content - anything
** that needs to be deallocated to avoid a leak.
*/
#define VdbeMemDynamic(X)  \
  (((X)->flags&(MEM_Agg|MEM_Dyn|MEM_RowSet|MEM_Frame))!=0)

/*
** Clear any existing type flags from a Mem and replace them with f
*/
#define MemSetTypeFlag(p, f) \
   ((p)->flags = ((p)->flags&~(MEM_TypeMask|MEM_Zero))|f)

/*
** Function prototypes
*/
SQLITE_PRIVATE void sqlite3VdbeError(Vdbe*, const char *, ...);
SQLITE_PRIVATE void sqlite3VdbeFreeCursor(Vdbe *, VdbeCursor*);
void sqliteVdbePopStack(Vdbe*,int);
SQLITE_PRIVATE int sqlite3VdbeCursorMoveto(VdbeCursor**, int*);
SQLITE_PRIVATE int sqlite3VdbeCursorRestore(VdbeCursor*);
#if defined(SQLITE_DEBUG) || defined(VDBE_PROFILE)
SQLITE_PRIVATE void sqlite3VdbePrintOp(FILE*, int, Op*);
#endif
SQLITE_PRIVATE u32 sqlite3VdbeSerialTypeLen(u32);
SQLITE_PRIVATE u8 sqlite3VdbeOneByteSerialTypeLen(u8);
SQLITE_PRIVATE u32 sqlite3VdbeSerialType(Mem*, int, u32*);

SQLITE_PRIVATE double sqlite3VdbeRealValue(Mem*);
SQLITE_PRIVATE void sqlite3VdbeIntegerAffinity(Mem*);
SQLITE_PRIVATE int sqlite3VdbeMemRealify(Mem*);
SQLITE_PRIVATE int sqlite3VdbeMemNumerify(Mem*);
SQLITE_PRIVATE void sqlite3VdbeMemCast(Mem*,u8,u8);
SQLITE_PRIVATE int sqlite3VdbeMemFromBtree(BtCursor*,u32,u32,int,Mem*);
SQLITE_PRIVATE void sqlite3VdbeMemRelease(Mem *p);


SQLITE_PRIVATE int sqlite3VdbeMemFinalize(Mem*, FuncDef*);
SQLITE_PRIVATE const char *sqlite3OpcodeName(int);
SQLITE_PRIVATE int sqlite3VdbeMemGrow(Mem *pMem, int n, int preserve);
SQLITE_PRIVATE int sqlite3VdbeMemClearAndResize(Mem *pMem, int n);
SQLITE_PRIVATE int sqlite3VdbeCloseStatement(Vdbe *, int);
SQLITE_PRIVATE void sqlite3VdbeFrameDelete(VdbeFrame*);
SQLITE_PRIVATE int sqlite3VdbeFrameRestore(VdbeFrame *);
SQLITE_PRIVATE int sqlite3VdbeTransferError(Vdbe *p);

SQLITE_PRIVATE int sqlite3VdbeSorterInit(sqlite3 *, int, VdbeCursor *);
SQLITE_PRIVATE void sqlite3VdbeSorterReset(sqlite3 *, VdbeSorter *);
SQLITE_PRIVATE void sqlite3VdbeSorterClose(sqlite3 *, VdbeCursor *);
SQLITE_PRIVATE int sqlite3VdbeSorterRowkey(const VdbeCursor *, Mem *);
SQLITE_PRIVATE int sqlite3VdbeSorterNext(sqlite3 *, const VdbeCursor *, int *);
SQLITE_PRIVATE int sqlite3VdbeSorterRewind(const VdbeCursor *, int *);
SQLITE_PRIVATE int sqlite3VdbeSorterWrite(const VdbeCursor *, Mem *);
SQLITE_PRIVATE int sqlite3VdbeSorterCompare(const VdbeCursor *, Mem *, int, int *);

#if !defined(SQLITE_OMIT_SHARED_CACHE) 
SQLITE_PRIVATE   void sqlite3VdbeEnter(Vdbe*);

#else
# define sqlite3VdbeEnter(X)
#endif

#if !defined(SQLITE_OMIT_SHARED_CACHE) && SQLITE_THREADSAFE>0
SQLITE_PRIVATE   void sqlite3VdbeLeave(Vdbe*);
#else
# define sqlite3VdbeLeave(X)
#endif

#ifdef SQLITE_DEBUG
SQLITE_PRIVATE void sqlite3VdbeMemAboutToChange(Vdbe*,Mem*);
SQLITE_PRIVATE int sqlite3VdbeCheckMemInvariants(Mem*);
#endif

  char validJD;      /* True (1) if iJD is valid */
  char validTZ;      /* True (1) if tz is valid */
  char tzSet;        /* Timezone was set explicitly */
};


/*
** Convert zDate into one or more integers according to the conversion
** specifier zFormat.
**
** zFormat[] contains 4 characters for each integer converted, except for
** the last integer which is specified by three characters.  The meaning
** of a four-character format specifiers ABCD is:
**
**    A:   number of digits to convert.  Always "2" or "4".
**    B:   minimum value.  Always "0" or "1".
**    C:   maximum value, decoded as:
**           a:  12
**           b:  14
**           c:  24
**           d:  31
**           e:  59
**           f:  9999
**    D:   the separator character, or \000 to indicate this is the
**         last number to convert.
**

** Example:  To translate an ISO-8601 date YYYY-MM-DD, the format would
** be "40f-21a-20c".  The "40f-" indicates the 4-digit year followed by "-".
** The "21a-" indicates the 2-digit month followed by "-".  The "20c" indicates
** the 2-digit day which is the last integer in the set.
**
** The function returns the number of successful conversions.
*/
static int getDigits(const char *zDate, const char *zFormat, ...){
  /* The aMx[] array translates the 3rd character of each format
  ** spec into a max size:    a   b   c   d   e     f */
  static const u16 aMx[] = { 12, 14, 24, 31, 59, 9999 };
  va_list ap;

  int cnt = 0;


  char nextC;


  va_start(ap, zFormat);
  do{
    char N = zFormat[0] - '0';
    char min = zFormat[1] - '0';
    int val = 0;
    u16 max;

    assert( zFormat[2]>='a' && zFormat[2]<='f' );
    max = aMx[zFormat[2] - 'a'];
    nextC = zFormat[3];

    val = 0;
    while( N-- ){
      if( !sqlite3Isdigit(*zDate) ){
        goto end_getDigits;
      }
      val = val*10 + *zDate - '0';
      zDate++;
    }
    if( val<(int)min || val>(int)max || (nextC!=0 && nextC!=*zDate) ){
      goto end_getDigits;
    }
    *va_arg(ap,int*) = val;
    zDate++;
    cnt++;
    zFormat += 4;
  }while( nextC );
end_getDigits:
  va_end(ap);
  return cnt;
}

/*

  }else if( c=='Z' || c=='z' ){
    zDate++;
    goto zulu_time;
  }else{
    return c!=0;
  }
  zDate++;
  if( getDigits(zDate, "20b:20e", &nHr, &nMn)!=2 ){
    return 1;
  }
  zDate += 5;
  p->tz = sgn*(nMn + nHr*60);
zulu_time:
  while( sqlite3Isspace(*zDate) ){ zDate++; }
  p->tzSet = 1;
  return *zDate!=0;
}

/*
** Parse times of the form HH:MM or HH:MM:SS or HH:MM:SS.FFFF.
** The HH, MM, and SS must each be exactly 2 digits.  The
** fractional seconds FFFF can be one or more digits.
**
** Return 1 if there is a parsing error and 0 on success.
*/
static int parseHhMmSs(const char *zDate, DateTime *p){
  int h, m, s;
  double ms = 0.0;
  if( getDigits(zDate, "20c:20e", &h, &m)!=2 ){
    return 1;
  }
  zDate += 5;
  if( *zDate==':' ){
    zDate++;
    if( getDigits(zDate, "20e", &s)!=1 ){
      return 1;
    }
    zDate += 2;
    if( *zDate=='.' && sqlite3Isdigit(zDate[1]) ){
      double rScale = 1.0;
      zDate++;
      while( sqlite3Isdigit(*zDate) ){

  if( zDate[0]=='-' ){
    zDate++;
    neg = 1;
  }else{
    neg = 0;
  }
  if( getDigits(zDate, "40f-21a-21d", &Y, &M, &D)!=3 ){
    return 1;
  }
  zDate += 10;
  while( sqlite3Isspace(*zDate) || 'T'==*(u8*)zDate ){ zDate++; }
  if( parseHhMmSs(zDate, p)==0 ){
    /* We got the time */
  }else if( *zDate==0 ){

  testcase( n==(u64)db->aLimit[SQLITE_LIMIT_LENGTH] );
  if( n<sizeof(zBuf) ){
    z = zBuf;
  }else if( n>(u64)db->aLimit[SQLITE_LIMIT_LENGTH] ){
    sqlite3_result_error_toobig(context);
    return;
  }else{
    z = sqlite3DbMallocRawNN(db, (int)n);
    if( z==0 ){
      sqlite3_result_error_nomem(context);
      return;
    }
  }
  computeJD(&x);
  computeYMD_HMS(&x);

** This file contains OS interface code that is common to all
** architectures.
*/
#define _SQLITE_OS_C_ 1
/* #include "sqliteInt.h" */
#undef _SQLITE_OS_C_

/*
** If we compile with the SQLITE_TEST macro set, then the following block
** of code will give us the ability to simulate a disk I/O error.  This
** is used for testing the I/O recovery logic.
*/
#if defined(SQLITE_TEST)
SQLITE_API int sqlite3_io_error_hit = 0;            /* Total number of I/O Errors */
SQLITE_API int sqlite3_io_error_hardhit = 0;        /* Number of non-benign errors */
SQLITE_API int sqlite3_io_error_pending = 0;        /* Count down to first I/O error */
SQLITE_API int sqlite3_io_error_persist = 0;        /* True if I/O errors persist */
SQLITE_API int sqlite3_io_error_benign = 0;         /* True if errors are benign */
SQLITE_API int sqlite3_diskfull_pending = 0;
SQLITE_API int sqlite3_diskfull = 0;
#endif /* defined(SQLITE_TEST) */

/*
** When testing, also keep a count of the number of open files.
*/
#if defined(SQLITE_TEST)
SQLITE_API int sqlite3_open_file_count = 0;
#endif /* defined(SQLITE_TEST) */

/*
** The default SQLite sqlite3_vfs implementations do not allocate
** memory (actually, os_unix.c allocates a small amount of memory
** from within OsOpen()), but some third-party implementations may.
** So we test the effects of a malloc() failing and the sqlite3OsXXX()
** function returning SQLITE_IOERR_NOMEM using the DO_OS_MALLOC_TEST macro.
**
** The following functions are instrumented for malloc() failure
** testing:
**
**     sqlite3OsRead()
**     sqlite3OsWrite()
**     sqlite3OsSync()
**     sqlite3OsFileSize()
**     sqlite3OsLock()

** is only a hint and can be safely ignored.  The sqlite3OsFileControlHint()
** routine has no return value since the return value would be meaningless.
*/
SQLITE_PRIVATE int sqlite3OsFileControl(sqlite3_file *id, int op, void *pArg){
#ifdef SQLITE_TEST
  if( op!=SQLITE_FCNTL_COMMIT_PHASETWO ){
    /* Faults are not injected into COMMIT_PHASETWO because, assuming SQLite
    ** is using a regular VFS, it is called after the corresponding
    ** transaction has been committed. Injecting a fault at this point
    ** confuses the test scripts - the COMMIT comand returns SQLITE_NOMEM
    ** but the transaction is committed anyway.
    **
    ** The core must call OsFileControl() though, not OsFileControlHint(),
    ** as if a custom VFS (e.g. zipvfs) returns an error here, it probably
    ** means the commit really has failed and an error should be returned
    ** to the user.  */

#endif

/*
** The next group of routines are convenience wrappers around the
** VFS methods.
*/
SQLITE_PRIVATE int sqlite3OsOpen(
  sqlite3_vfs *pVfs,
  const char *zPath,
  sqlite3_file *pFile,
  int flags,
  int *pFlagsOut
){
  int rc;
  DO_OS_MALLOC_TEST(0);
  /* 0x87f7f is a mask of SQLITE_OPEN_ flags that are valid to be passed
  ** down into the VFS layer.  Some SQLITE_OPEN_ flags (for example,
  ** SQLITE_OPEN_FULLMUTEX or SQLITE_OPEN_SHAREDCACHE) are blocked before
  ** reaching the VFS. */
  rc = pVfs->xOpen(pVfs, zPath, pFile, flags & 0x87f7f, pFlagsOut);
  assert( rc==SQLITE_OK || pFile->pMethods==0 );
  return rc;
}
SQLITE_PRIVATE int sqlite3OsDelete(sqlite3_vfs *pVfs, const char *zPath, int dirSync){
  DO_OS_MALLOC_TEST(0);
  assert( dirSync==0 || dirSync==1 );
  return pVfs->xDelete(pVfs, zPath, dirSync);
}
SQLITE_PRIVATE int sqlite3OsAccess(
  sqlite3_vfs *pVfs,
  const char *zPath,
  int flags,
  int *pResOut
){
  DO_OS_MALLOC_TEST(0);
  return pVfs->xAccess(pVfs, zPath, flags, pResOut);
}
SQLITE_PRIVATE int sqlite3OsFullPathname(
  sqlite3_vfs *pVfs,
  const char *zPath,
  int nPathOut,
  char *zPathOut
){
  DO_OS_MALLOC_TEST(0);
  zPathOut[0] = 0;
  return pVfs->xFullPathname(pVfs, zPath, nPathOut, zPathOut);
}
#ifndef SQLITE_OMIT_LOAD_EXTENSION

    rc = pVfs->xCurrentTime(pVfs, &r);
    *pTimeOut = (sqlite3_int64)(r*86400000.0);
  }
  return rc;
}

SQLITE_PRIVATE int sqlite3OsOpenMalloc(
  sqlite3_vfs *pVfs,
  const char *zFile,
  sqlite3_file **ppFile,
  int flags,
  int *pOutFlags
){
  int rc = SQLITE_NOMEM;
  sqlite3_file *pFile;
  pFile = (sqlite3_file *)sqlite3MallocZero(pVfs->szOsFile);
  if( pFile ){

  u8 *zPool;       /* Memory available to be allocated */
  
  /*
  ** Mutex to control access to the memory allocation subsystem.
  */
  sqlite3_mutex *mutex;

#if defined(SQLITE_DEBUG) || defined(SQLITE_TEST)
  /*
  ** Performance statistics
  */
  u64 nAlloc;         /* Total number of calls to malloc */
  u64 totalAlloc;     /* Total of all malloc calls - includes internal frag */
  u64 totalExcess;    /* Total internal fragmentation */
  u32 currentOut;     /* Current checkout, including internal fragmentation */
  u32 currentCount;   /* Current number of distinct checkouts */
  u32 maxOut;         /* Maximum instantaneous currentOut */
  u32 maxCount;       /* Maximum instantaneous currentCount */
  u32 maxRequest;     /* Largest allocation (exclusive of internal frag) */
#endif
  
  /*
  ** Lists of free blocks.  aiFreelist[0] is a list of free blocks of
  ** size mem5.szAtom.  aiFreelist[1] holds blocks of size szAtom*2.
  ** aiFreelist[2] holds free blocks of size szAtom*4.  And so forth.
  */
  int aiFreelist[LOGMAX+1];

  int iBin;        /* Index into mem5.aiFreelist[] */
  int iFullSz;     /* Size of allocation rounded up to power of 2 */
  int iLogsize;    /* Log2 of iFullSz/POW2_MIN */

  /* nByte must be a positive */
  assert( nByte>0 );

  /* No more than 1GiB per allocation */
  if( nByte > 0x40000000 ) return 0;

#if defined(SQLITE_DEBUG) || defined(SQLITE_TEST)
  /* Keep track of the maximum allocation request.  Even unfulfilled
  ** requests are counted */
  if( (u32)nByte>mem5.maxRequest ){



    mem5.maxRequest = nByte;
  }
#endif


  /* Round nByte up to the next valid power of two */
  for(iFullSz=mem5.szAtom,iLogsize=0; iFullSz<nByte; iFullSz*=2,iLogsize++){}

  /* Make sure mem5.aiFreelist[iLogsize] contains at least one free
  ** block.  If not, then split a block of the next larger power of
  ** two in order to create a new free block of size iLogsize.

    iBin--;
    newSize = 1 << iBin;
    mem5.aCtrl[i+newSize] = CTRL_FREE | iBin;
    memsys5Link(i+newSize, iBin);
  }
  mem5.aCtrl[i] = iLogsize;

#if defined(SQLITE_DEBUG) || defined(SQLITE_TEST)
  /* Update allocator performance statistics. */
  mem5.nAlloc++;
  mem5.totalAlloc += iFullSz;
  mem5.totalExcess += iFullSz - nByte;
  mem5.currentCount++;
  mem5.currentOut += iFullSz;
  if( mem5.maxCount<mem5.currentCount ) mem5.maxCount = mem5.currentCount;
  if( mem5.maxOut<mem5.currentOut ) mem5.maxOut = mem5.currentOut;
#endif

#ifdef SQLITE_DEBUG
  /* Make sure the allocated memory does not assume that it is set to zero
  ** or retains a value from a previous allocation */
  memset(&mem5.zPool[i*mem5.szAtom], 0xAA, iFullSz);
#endif

  iLogsize = mem5.aCtrl[iBlock] & CTRL_LOGSIZE;
  size = 1<<iLogsize;
  assert( iBlock+size-1<(u32)mem5.nBlock );

  mem5.aCtrl[iBlock] |= CTRL_FREE;
  mem5.aCtrl[iBlock+size-1] |= CTRL_FREE;

#if defined(SQLITE_DEBUG) || defined(SQLITE_TEST)
  assert( mem5.currentCount>0 );
  assert( mem5.currentOut>=(size*mem5.szAtom) );
  mem5.currentCount--;
  mem5.currentOut -= size*mem5.szAtom;
  assert( mem5.currentOut>0 || mem5.currentCount==0 );
  assert( mem5.currentCount>0 || mem5.currentOut==0 );
#endif

  mem5.aCtrl[iBlock] = CTRL_FREE | iLogsize;
  while( ALWAYS(iLogsize<LOGMAX) ){
    int iBuddy;
    if( (iBlock>>iLogsize) & 1 ){
      iBuddy = iBlock - size;
      assert( iBuddy>=0 );
    }else{
      iBuddy = iBlock + size;
      if( iBuddy>=mem5.nBlock ) break;
    }


    if( mem5.aCtrl[iBuddy]!=(CTRL_FREE | iLogsize) ) break;
    memsys5Unlink(iBuddy, iLogsize);
    iLogsize++;
    if( iBuddy<iBlock ){
      mem5.aCtrl[iBuddy] = CTRL_FREE | iLogsize;
      mem5.aCtrl[iBlock] = 0;
      iBlock = iBuddy;

/*
** Macros for performance tracing.  Normally turned off.  Only works
** on i486 hardware.
*/
#ifdef SQLITE_PERFORMANCE_TRACE

/*
** hwtime.h contains inline assembler code for implementing
** high-performance timing routines.
*/
/************** Include hwtime.h in the middle of os_common.h ****************/
/************** Begin file hwtime.h ******************************************/
/*
** 2008 May 27
**

#endif

/*
** If we compile with the SQLITE_TEST macro set, then the following block
** of code will give us the ability to simulate a disk I/O error.  This
** is used for testing the I/O recovery logic.
*/
#if defined(SQLITE_TEST)
SQLITE_API extern int sqlite3_io_error_hit;
SQLITE_API extern int sqlite3_io_error_hardhit;
SQLITE_API extern int sqlite3_io_error_pending;
SQLITE_API extern int sqlite3_io_error_persist;
SQLITE_API extern int sqlite3_io_error_benign;
SQLITE_API extern int sqlite3_diskfull_pending;
SQLITE_API extern int sqlite3_diskfull;
#define SimulateIOErrorBenign(X) sqlite3_io_error_benign=(X)
#define SimulateIOError(CODE)  \
  if( (sqlite3_io_error_persist && sqlite3_io_error_hit) \
       || sqlite3_io_error_pending-- == 1 )  \
              { local_ioerr(); CODE; }
static void local_ioerr(){
  IOTRACE(("IOERR\n"));

       sqlite3_diskfull_pending--; \
     } \
   }
#else
#define SimulateIOErrorBenign(X)
#define SimulateIOError(A)
#define SimulateDiskfullError(A)
#endif /* defined(SQLITE_TEST) */

/*
** When testing, keep a count of the number of open files.
*/
#if defined(SQLITE_TEST)
SQLITE_API extern int sqlite3_open_file_count;
#define OpenCounter(X)  sqlite3_open_file_count+=(X)
#else
#define OpenCounter(X)
#endif /* defined(SQLITE_TEST) */

#endif /* !defined(_OS_COMMON_H_) */

/************** End of os_common.h *******************************************/
/************** Continuing where we left off in mutex_w32.c ******************/

/*

}

/*
** Allocate and zero memory.  If the allocation fails, make
** the mallocFailed flag in the connection pointer.
*/
SQLITE_PRIVATE void *sqlite3DbMallocZero(sqlite3 *db, u64 n){
  void *p;
  testcase( db==0 );
  p = sqlite3DbMallocRaw(db, n);

  if( p ) memset(p, 0, (size_t)n);
  return p;
}


/* Finish the work of sqlite3DbMallocRawNN for the unusual and
** slower case when the allocation cannot be fulfilled using lookaside.
*/
static SQLITE_NOINLINE void *dbMallocRawFinish(sqlite3 *db, u64 n){
  void *p;
  assert( db!=0 );
  p = sqlite3Malloc(n);
  if( !p ) sqlite3OomFault(db);
  sqlite3MemdebugSetType(p, 
         (db->lookaside.bDisable==0) ? MEMTYPE_LOOKASIDE : MEMTYPE_HEAP);
  return p;
}

/*
** Allocate memory, either lookaside (if possible) or heap.  
** If the allocation fails, set the mallocFailed flag in
** the connection pointer.
**
** If db!=0 and db->mallocFailed is true (indicating a prior malloc
** failure on the same database connection) then always return 0.
** Hence for a particular database connection, once malloc starts
** failing, it fails consistently until mallocFailed is reset.
** This is an important assumption.  There are many places in the
** code that do things like this:
**
**         int *a = (int*)sqlite3DbMallocRaw(db, 100);
**         int *b = (int*)sqlite3DbMallocRaw(db, 200);
**         if( b ) a[10] = 9;
**
** In other words, if a subsequent malloc (ex: "b") worked, it is assumed
** that all prior mallocs (ex: "a") worked too.
**
** The sqlite3MallocRawNN() variant guarantees that the "db" parameter is
** not a NULL pointer.
*/
SQLITE_PRIVATE void *sqlite3DbMallocRaw(sqlite3 *db, u64 n){
  void *p;
  if( db ) return sqlite3DbMallocRawNN(db, n);
  p = sqlite3Malloc(n);

  sqlite3MemdebugSetType(p, MEMTYPE_HEAP);
  return p;
}
SQLITE_PRIVATE void *sqlite3DbMallocRawNN(sqlite3 *db, u64 n){
#ifndef SQLITE_OMIT_LOOKASIDE

  LookasideSlot *pBuf;
  assert( db!=0 );
  assert( sqlite3_mutex_held(db->mutex) );
  assert( db->pnBytesFreed==0 );

  if( db->lookaside.bDisable==0 ){
    assert( db->mallocFailed==0 );
    if( n>db->lookaside.sz ){
      db->lookaside.anStat[1]++;
    }else if( (pBuf = db->lookaside.pFree)==0 ){
      db->lookaside.anStat[2]++;
    }else{
      db->lookaside.pFree = pBuf->pNext;
      db->lookaside.nOut++;
      db->lookaside.anStat[0]++;
      if( db->lookaside.nOut>db->lookaside.mxOut ){
        db->lookaside.mxOut = db->lookaside.nOut;
      }
      return (void*)pBuf;
    }
  }else if( db->mallocFailed ){
    return 0;
  }

#else
  assert( db!=0 );
  assert( sqlite3_mutex_held(db->mutex) );
  assert( db->pnBytesFreed==0 );
  if( db->mallocFailed ){
    return 0;
  }
#endif
  return dbMallocRawFinish(db, n);


}




/* Forward declaration */
static SQLITE_NOINLINE void *dbReallocFinish(sqlite3 *db, void *p, u64 n);

/*
** Resize the block of memory pointed to by p to n bytes. If the
** resize fails, set the mallocFailed flag in the connection object.
*/
SQLITE_PRIVATE void *sqlite3DbRealloc(sqlite3 *db, void *p, u64 n){
  assert( db!=0 );
  if( p==0 ) return sqlite3DbMallocRawNN(db, n);
  assert( sqlite3_mutex_held(db->mutex) );
  if( isLookaside(db,p) && n<=db->lookaside.sz ) return p;
  return dbReallocFinish(db, p, n);
}
static SQLITE_NOINLINE void *dbReallocFinish(sqlite3 *db, void *p, u64 n){
  void *pNew = 0;
  assert( db!=0 );
  assert( p!=0 );
  if( db->mallocFailed==0 ){



    if( isLookaside(db, p) ){



      pNew = sqlite3DbMallocRawNN(db, n);
      if( pNew ){
        memcpy(pNew, p, db->lookaside.sz);
        sqlite3DbFree(db, p);
      }
    }else{
      assert( sqlite3MemdebugHasType(p, (MEMTYPE_LOOKASIDE|MEMTYPE_HEAP)) );
      assert( sqlite3MemdebugNoType(p, (u8)~(MEMTYPE_LOOKASIDE|MEMTYPE_HEAP)) );
      sqlite3MemdebugSetType(p, MEMTYPE_HEAP);
      pNew = sqlite3_realloc64(p, n);
      if( !pNew ){
        sqlite3OomFault(db);
      }
      sqlite3MemdebugSetType(pNew,
            (db->lookaside.bDisable==0 ? MEMTYPE_LOOKASIDE : MEMTYPE_HEAP));
    }
  }
  return pNew;
}

/*
** Attempt to reallocate p.  If the reallocation fails, then free p

  if( zNew ){
    memcpy(zNew, z, n);
  }
  return zNew;
}
SQLITE_PRIVATE char *sqlite3DbStrNDup(sqlite3 *db, const char *z, u64 n){
  char *zNew;
  assert( db!=0 );
  if( z==0 ){
    return 0;
  }
  assert( (n&0x7fffffff)==n );
  zNew = sqlite3DbMallocRawNN(db, n+1);
  if( zNew ){
    memcpy(zNew, z, (size_t)n);
    zNew[n] = 0;
  }
  return zNew;
}

/*
** Free any prior content in *pz and replace it with a copy of zNew.
*/
SQLITE_PRIVATE void sqlite3SetString(char **pz, sqlite3 *db, const char *zNew){
  sqlite3DbFree(db, *pz);
  *pz = sqlite3DbStrDup(db, zNew);
}

/*
** Call this routine to record the fact that an OOM (out-of-memory) error
** has happened.  This routine will set db->mallocFailed, and also
** temporarily disable the lookaside memory allocator and interrupt
** any running VDBEs.
*/
SQLITE_PRIVATE void sqlite3OomFault(sqlite3 *db){
  if( db->mallocFailed==0 && db->bBenignMalloc==0 ){
    db->mallocFailed = 1;
    if( db->nVdbeExec>0 ){
      db->u1.isInterrupted = 1;
    }
    db->lookaside.bDisable++;
  }
}

/*
** This routine reactivates the memory allocator and clears the
** db->mallocFailed flag as necessary.
**
** The memory allocator is not restarted if there are running
** VDBEs.
*/
SQLITE_PRIVATE void sqlite3OomClear(sqlite3 *db){
  if( db->mallocFailed && db->nVdbeExec==0 ){
    db->mallocFailed = 0;
    db->u1.isInterrupted = 0;
    assert( db->lookaside.bDisable>0 );
    db->lookaside.bDisable--;
  }
}

/*
** Take actions at the end of an API call to indicate an OOM error
*/
static SQLITE_NOINLINE int apiOomError(sqlite3 *db){
  sqlite3OomClear(db);
  sqlite3Error(db, SQLITE_NOMEM);
  return SQLITE_NOMEM;
}

/*
** This function must be called before exiting any API function (i.e. 
** returning control to the user) that has called sqlite3_malloc or

#define etBUFSIZE SQLITE_PRINT_BUF_SIZE  /* Size of the output buffer */

/*
** Render a string given by "fmt" into the StrAccum object.
*/
SQLITE_PRIVATE void sqlite3VXPrintf(
  StrAccum *pAccum,          /* Accumulate results here */

  const char *fmt,           /* Format string */
  va_list ap                 /* arguments */
){
  int c;                     /* Next character in the format string */
  char *bufpt;               /* Pointer to the conversion buffer */
  int precision;             /* Precision of the current field */
  int length;                /* Length of the field */

  etByte flag_dp;            /* True if decimal point should be shown */
  etByte flag_rtz;           /* True if trailing zeros should be removed */
#endif
  PrintfArguments *pArgList = 0; /* Arguments for SQLITE_PRINTF_SQLFUNC */
  char buf[etBUFSIZE];       /* Conversion buffer */

  bufpt = 0;
  if( pAccum->printfFlags ){
    if( (bArgList = (pAccum->printfFlags & SQLITE_PRINTF_SQLFUNC))!=0 ){
      pArgList = va_arg(ap, PrintfArguments*);
    }
    useIntern = pAccum->printfFlags & SQLITE_PRINTF_INTERNAL;
  }else{
    bArgList = useIntern = 0;
  }
  for(; (c=(*fmt))!=0; ++fmt){
    if( c!='%' ){
      bufpt = (char *)fmt;
#if HAVE_STRCHRNUL

    return 0;
  }
  if( p->mxAlloc==0 ){
    N = p->nAlloc - p->nChar - 1;
    setStrAccumError(p, STRACCUM_TOOBIG);
    return N;
  }else{
    char *zOld = isMalloced(p) ? p->zText : 0;
    i64 szNew = p->nChar;
    assert( (p->zText==0 || p->zText==p->zBase)==!isMalloced(p) );
    szNew += N + 1;
    if( szNew+p->nChar<=p->mxAlloc ){
      /* Force exponential buffer size growth as long as it does not overflow,
      ** to avoid having to call this routine too often */
      szNew += p->nChar;
    }
    if( szNew > p->mxAlloc ){
      sqlite3StrAccumReset(p);
      setStrAccumError(p, STRACCUM_TOOBIG);
      return 0;
    }else{
      p->nAlloc = (int)szNew;
    }
    if( p->db ){
      zNew = sqlite3DbRealloc(p->db, zOld, p->nAlloc);
    }else{
      zNew = sqlite3_realloc64(zOld, p->nAlloc);
    }
    if( zNew ){
      assert( p->zText!=0 || p->nChar==0 );
      if( !isMalloced(p) && p->nChar>0 ) memcpy(zNew, p->zText, p->nChar);
      p->zText = zNew;
      p->nAlloc = sqlite3DbMallocSize(p->db, zNew);
      p->printfFlags |= SQLITE_PRINTF_MALLOCED;
    }else{
      sqlite3StrAccumReset(p);
      setStrAccumError(p, STRACCUM_NOMEM);
      return 0;
    }
  }
  return N;
}

/*
** Append N copies of character c to the given string buffer.
*/
SQLITE_PRIVATE void sqlite3AppendChar(StrAccum *p, int N, char c){
  testcase( p->nChar + (i64)N > 0x7fffffff );
  if( p->nChar+(i64)N >= p->nAlloc && (N = sqlite3StrAccumEnlarge(p, N))<=0 ){
    return;
  }
  assert( (p->zText==p->zBase)==!isMalloced(p) );
  while( (N--)>0 ) p->zText[p->nChar++] = c;
}

/*
** The StrAccum "p" is not large enough to accept N new bytes of z[].
** So enlarge if first, then do the append.
**
** This is a helper routine to sqlite3StrAccumAppend() that does special-case
** work (enlarging the buffer) using tail recursion, so that the
** sqlite3StrAccumAppend() routine can use fast calling semantics.
*/
static void SQLITE_NOINLINE enlargeAndAppend(StrAccum *p, const char *z, int N){
  N = sqlite3StrAccumEnlarge(p, N);
  if( N>0 ){
    memcpy(&p->zText[p->nChar], z, N);
    p->nChar += N;
  }
  assert( (p->zText==0 || p->zText==p->zBase)==!isMalloced(p) );
}

/*
** Append N bytes of text from z to the StrAccum object.  Increase the
** size of the memory allocation for StrAccum if necessary.
*/
SQLITE_PRIVATE void sqlite3StrAccumAppend(StrAccum *p, const char *z, int N){

/*
** Finish off a string by making sure it is zero-terminated.
** Return a pointer to the resulting string.  Return a NULL
** pointer if any kind of error was encountered.
*/
SQLITE_PRIVATE char *sqlite3StrAccumFinish(StrAccum *p){
  if( p->zText ){
    assert( (p->zText==p->zBase)==!isMalloced(p) );
    p->zText[p->nChar] = 0;
    if( p->mxAlloc>0 && !isMalloced(p) ){
      p->zText = sqlite3DbMallocRaw(p->db, p->nChar+1 );
      if( p->zText ){
        memcpy(p->zText, p->zBase, p->nChar+1);
        p->printfFlags |= SQLITE_PRINTF_MALLOCED;
      }else{
        setStrAccumError(p, STRACCUM_NOMEM);
      }
    }
  }
  return p->zText;
}

/*
** Reset an StrAccum string.  Reclaim all malloced memory.
*/
SQLITE_PRIVATE void sqlite3StrAccumReset(StrAccum *p){
  assert( (p->zText==0 || p->zText==p->zBase)==!isMalloced(p) );
  if( isMalloced(p) ){
    sqlite3DbFree(p->db, p->zText);
    p->printfFlags &= ~SQLITE_PRINTF_MALLOCED;
  }
  p->zText = 0;
}

/*
** Initialize a string accumulator.
**

SQLITE_PRIVATE void sqlite3StrAccumInit(StrAccum *p, sqlite3 *db, char *zBase, int n, int mx){
  p->zText = p->zBase = zBase;
  p->db = db;
  p->nChar = 0;
  p->nAlloc = n;
  p->mxAlloc = mx;
  p->accError = 0;
  p->printfFlags = 0;
}

/*
** Print into memory obtained from sqliteMalloc().  Use the internal
** %-conversion extensions.
*/
SQLITE_PRIVATE char *sqlite3VMPrintf(sqlite3 *db, const char *zFormat, va_list ap){
  char *z;
  char zBase[SQLITE_PRINT_BUF_SIZE];
  StrAccum acc;
  assert( db!=0 );
  sqlite3StrAccumInit(&acc, db, zBase, sizeof(zBase),
                      db->aLimit[SQLITE_LIMIT_LENGTH]);
  acc.printfFlags = SQLITE_PRINTF_INTERNAL;
  sqlite3VXPrintf(&acc, zFormat, ap);
  z = sqlite3StrAccumFinish(&acc);
  if( acc.accError==STRACCUM_NOMEM ){
    sqlite3OomFault(db);
  }
  return z;
}

/*
** Print into memory obtained from sqliteMalloc().  Use the internal
** %-conversion extensions.

    return 0;
  }
#endif
#ifndef SQLITE_OMIT_AUTOINIT
  if( sqlite3_initialize() ) return 0;
#endif
  sqlite3StrAccumInit(&acc, 0, zBase, sizeof(zBase), SQLITE_MAX_LENGTH);
  sqlite3VXPrintf(&acc, zFormat, ap);
  z = sqlite3StrAccumFinish(&acc);
  return z;
}

/*
** Print into memory obtained from sqlite3_malloc()().  Omit the internal
** %-conversion extensions.

  if( zBuf==0 || zFormat==0 ) {
    (void)SQLITE_MISUSE_BKPT;
    if( zBuf ) zBuf[0] = 0;
    return zBuf;
  }
#endif
  sqlite3StrAccumInit(&acc, 0, zBuf, n, 0);
  sqlite3VXPrintf(&acc, zFormat, ap);
  return sqlite3StrAccumFinish(&acc);
}
SQLITE_API char *SQLITE_CDECL sqlite3_snprintf(int n, char *zBuf, const char *zFormat, ...){
  char *z;
  va_list ap;
  va_start(ap,zFormat);
  z = sqlite3_vsnprintf(n, zBuf, zFormat, ap);

** memory mutex is held do not use these mechanisms.
*/
static void renderLogMsg(int iErrCode, const char *zFormat, va_list ap){
  StrAccum acc;                          /* String accumulator */
  char zMsg[SQLITE_PRINT_BUF_SIZE*3];    /* Complete log message */

  sqlite3StrAccumInit(&acc, 0, zMsg, sizeof(zMsg), 0);
  sqlite3VXPrintf(&acc, zFormat, ap);
  sqlite3GlobalConfig.xLog(sqlite3GlobalConfig.pLogArg, iErrCode,
                           sqlite3StrAccumFinish(&acc));
}

/*
** Format and write a message to the log if logging is enabled.
*/

*/
SQLITE_PRIVATE void sqlite3DebugPrintf(const char *zFormat, ...){
  va_list ap;
  StrAccum acc;
  char zBuf[500];
  sqlite3StrAccumInit(&acc, 0, zBuf, sizeof(zBuf), 0);
  va_start(ap,zFormat);
  sqlite3VXPrintf(&acc, zFormat, ap);
  va_end(ap);
  sqlite3StrAccumFinish(&acc);
  fprintf(stdout,"%s", zBuf);
  fflush(stdout);
}
#endif


/*
** variable-argument wrapper around sqlite3VXPrintf().  The bFlags argument
** can contain the bit SQLITE_PRINTF_INTERNAL enable internal formats.
*/
SQLITE_PRIVATE void sqlite3XPrintf(StrAccum *p, const char *zFormat, ...){
  va_list ap;
  va_start(ap,zFormat);
  sqlite3VXPrintf(p, zFormat, ap);
  va_end(ap);
}

/************** End of printf.c **********************************************/
/************** Begin file treeview.c ****************************************/
/*
** 2015-06-08

  if( p ){
    for(i=0; i<p->iLevel && i<sizeof(p->bLine)-1; i++){
      sqlite3StrAccumAppend(&acc, p->bLine[i] ? "|   " : "    ", 4);
    }
    sqlite3StrAccumAppend(&acc, p->bLine[i] ? "|-- " : "'-- ", 4);
  }
  va_start(ap, zFormat);
  sqlite3VXPrintf(&acc, zFormat, ap);
  va_end(ap);
  if( zBuf[acc.nChar-1]!='\n' ) sqlite3StrAccumAppend(&acc, "\n", 1);
  sqlite3StrAccumFinish(&acc);
  fprintf(stdout,"%s", zBuf);
  fflush(stdout);
}

  if( pWith->nCte>0 ){
    pView = sqlite3TreeViewPush(pView, 1);
    for(i=0; i<pWith->nCte; i++){
      StrAccum x;
      char zLine[1000];
      const struct Cte *pCte = &pWith->a[i];
      sqlite3StrAccumInit(&x, 0, zLine, sizeof(zLine), 0);
      sqlite3XPrintf(&x, "%s", pCte->zName);
      if( pCte->pCols && pCte->pCols->nExpr>0 ){
        char cSep = '(';
        int j;
        for(j=0; j<pCte->pCols->nExpr; j++){
          sqlite3XPrintf(&x, "%c%s", cSep, pCte->pCols->a[j].zName);
          cSep = ',';
        }
        sqlite3XPrintf(&x, ")");
      }
      sqlite3XPrintf(&x, " AS");
      sqlite3StrAccumFinish(&x);
      sqlite3TreeViewItem(pView, zLine, i<pWith->nCte-1);
      sqlite3TreeViewSelect(pView, pCte->pSelect, 0);
      sqlite3TreeViewPop(pView);
    }
    sqlite3TreeViewPop(pView);
  }

      pView = sqlite3TreeViewPush(pView, (n--)>0);
      sqlite3TreeViewLine(pView, "FROM");
      for(i=0; i<p->pSrc->nSrc; i++){
        struct SrcList_item *pItem = &p->pSrc->a[i];
        StrAccum x;
        char zLine[100];
        sqlite3StrAccumInit(&x, 0, zLine, sizeof(zLine), 0);
        sqlite3XPrintf(&x, "{%d,*}", pItem->iCursor);
        if( pItem->zDatabase ){
          sqlite3XPrintf(&x, " %s.%s", pItem->zDatabase, pItem->zName);
        }else if( pItem->zName ){
          sqlite3XPrintf(&x, " %s", pItem->zName);
        }
        if( pItem->pTab ){
          sqlite3XPrintf(&x, " tabname=%Q", pItem->pTab->zName);
        }
        if( pItem->zAlias ){
          sqlite3XPrintf(&x, " (AS %s)", pItem->zAlias);
        }
        if( pItem->fg.jointype & JT_LEFT ){
          sqlite3XPrintf(&x, " LEFT-JOIN");
        }
        sqlite3StrAccumFinish(&x);
        sqlite3TreeViewItem(pView, zLine, i<p->pSrc->nSrc-1); 
        if( pItem->pSelect ){
          sqlite3TreeViewSelect(pView, pItem->pSelect, 0);
        }
        if( pItem->fg.isTabFunc ){

    pMem->n = (int)(z - zOut);
  }
  *z = 0;
  assert( (pMem->n+(desiredEnc==SQLITE_UTF8?1:2))<=len );

  c = pMem->flags;
  sqlite3VdbeMemRelease(pMem);
  pMem->flags = MEM_Str|MEM_Term|(c&(MEM_AffMask|MEM_Subtype));
  pMem->enc = desiredEnc;
  pMem->z = (char*)zOut;
  pMem->zMalloc = pMem->z;
  pMem->szMalloc = sqlite3DbMallocSize(pMem->db, pMem->z);

translate_out:
#if defined(TRANSLATE_TRACE) && defined(SQLITE_DEBUG)

    }else{
      z[j++] = z[i];
    }
  }
  z[j] = 0;
  return j;
}

/*
** Generate a Token object from a string
*/
SQLITE_PRIVATE void sqlite3TokenInit(Token *p, char *z){
  p->z = z;
  p->n = sqlite3Strlen30(z);
}

/* Convenient short-hand */
#define UpperToLower sqlite3UpperToLower

/*
** Some systems have stricmp().  Others have strcasecmp().  Because
** there is no consistency, we will define our own.

** binary value has been obtained from malloc and must be freed by
** the calling routine.
*/
SQLITE_PRIVATE void *sqlite3HexToBlob(sqlite3 *db, const char *z, int n){
  char *zBlob;
  int i;

  zBlob = (char *)sqlite3DbMallocRawNN(db, n/2 + 1);
  n--;
  if( zBlob ){
    for(i=0; i<n; i+=2){
      zBlob[i/2] = (sqlite3HexToInt(z[i])<<4) | sqlite3HexToInt(z[i+1]);
    }
    zBlob[i/2] = 0;
  }

 || defined(SQLITE_DEBUG)
#if defined(SQLITE_ENABLE_EXPLAIN_COMMENTS) || defined(SQLITE_DEBUG)
# define OpHelp(X) "\0" X
#else
# define OpHelp(X)
#endif
SQLITE_PRIVATE const char *sqlite3OpcodeName(int i){
 static const char *const azName[] = {
    /*   0 */ "Savepoint"        OpHelp(""),
    /*   1 */ "AutoCommit"       OpHelp(""),
    /*   2 */ "Transaction"      OpHelp(""),
    /*   3 */ "SorterNext"       OpHelp(""),
    /*   4 */ "PrevIfOpen"       OpHelp(""),
    /*   5 */ "NextIfOpen"       OpHelp(""),
    /*   6 */ "Prev"             OpHelp(""),
    /*   7 */ "Next"             OpHelp(""),
    /*   8 */ "Checkpoint"       OpHelp(""),
    /*   9 */ "JournalMode"      OpHelp(""),
    /*  10 */ "Vacuum"           OpHelp(""),
    /*  11 */ "VFilter"          OpHelp("iplan=r[P3] zplan='P4'"),
    /*  12 */ "VUpdate"          OpHelp("data=r[P3@P2]"),
    /*  13 */ "Goto"             OpHelp(""),
    /*  14 */ "Gosub"            OpHelp(""),
    /*  15 */ "Return"           OpHelp(""),
    /*  16 */ "InitCoroutine"    OpHelp(""),
    /*  17 */ "EndCoroutine"     OpHelp(""),
    /*  18 */ "Yield"            OpHelp(""),
    /*  19 */ "Not"              OpHelp("r[P2]= !r[P1]"),

    /*  20 */ "HaltIfNull"       OpHelp("if r[P3]=null halt"),
    /*  21 */ "Halt"             OpHelp(""),
    /*  22 */ "Integer"          OpHelp("r[P2]=P1"),
    /*  23 */ "Int64"            OpHelp("r[P2]=P4"),
    /*  24 */ "String"           OpHelp("r[P2]='P4' (len=P1)"),
    /*  25 */ "Null"             OpHelp("r[P2..P3]=NULL"),
    /*  26 */ "SoftNull"         OpHelp("r[P1]=NULL"),
    /*  27 */ "Blob"             OpHelp("r[P2]=P4 (len=P1)"),
    /*  28 */ "Variable"         OpHelp("r[P2]=parameter(P1,P4)"),
    /*  29 */ "Move"             OpHelp("r[P2@P3]=r[P1@P3]"),
    /*  30 */ "Copy"             OpHelp("r[P2@P3+1]=r[P1@P3+1]"),
    /*  31 */ "SCopy"            OpHelp("r[P2]=r[P1]"),
    /*  32 */ "IntCopy"          OpHelp("r[P2]=r[P1]"),
    /*  33 */ "ResultRow"        OpHelp("output=r[P1@P2]"),
    /*  34 */ "CollSeq"          OpHelp(""),
    /*  35 */ "Function0"        OpHelp("r[P3]=func(r[P2@P5])"),
    /*  36 */ "Function"         OpHelp("r[P3]=func(r[P2@P5])"),
    /*  37 */ "AddImm"           OpHelp("r[P1]=r[P1]+P2"),
    /*  38 */ "MustBeInt"        OpHelp(""),
    /*  39 */ "RealAffinity"     OpHelp(""),
    /*  40 */ "Cast"             OpHelp("affinity(r[P1])"),
    /*  41 */ "Permutation"      OpHelp(""),
    /*  42 */ "Compare"          OpHelp("r[P1@P3] <-> r[P2@P3]"),
    /*  43 */ "Jump"             OpHelp(""),
    /*  44 */ "Once"             OpHelp(""),
    /*  45 */ "If"               OpHelp(""),
    /*  46 */ "IfNot"            OpHelp(""),
    /*  47 */ "Column"           OpHelp("r[P3]=PX"),
    /*  48 */ "Affinity"         OpHelp("affinity(r[P1@P2])"),
    /*  49 */ "MakeRecord"       OpHelp("r[P3]=mkrec(r[P1@P2])"),
    /*  50 */ "Count"            OpHelp("r[P2]=count()"),
    /*  51 */ "ReadCookie"       OpHelp(""),
    /*  52 */ "SetCookie"        OpHelp(""),
    /*  53 */ "ReopenIdx"        OpHelp("root=P2 iDb=P3"),
    /*  54 */ "OpenRead"         OpHelp("root=P2 iDb=P3"),
    /*  55 */ "OpenWrite"        OpHelp("root=P2 iDb=P3"),
    /*  56 */ "OpenAutoindex"    OpHelp("nColumn=P2"),
    /*  57 */ "OpenEphemeral"    OpHelp("nColumn=P2"),
    /*  58 */ "SorterOpen"       OpHelp(""),
    /*  59 */ "SequenceTest"     OpHelp("if( cursor[P1].ctr++ ) pc = P2"),
    /*  60 */ "OpenPseudo"       OpHelp("P3 columns in r[P2]"),
    /*  61 */ "Close"            OpHelp(""),
    /*  62 */ "ColumnsUsed"      OpHelp(""),
    /*  63 */ "SeekLT"           OpHelp("key=r[P3@P4]"),
    /*  64 */ "SeekLE"           OpHelp("key=r[P3@P4]"),
    /*  65 */ "SeekGE"           OpHelp("key=r[P3@P4]"),
    /*  66 */ "SeekGT"           OpHelp("key=r[P3@P4]"),

    /*  67 */ "NoConflict"       OpHelp("key=r[P3@P4]"),
    /*  68 */ "NotFound"         OpHelp("key=r[P3@P4]"),
    /*  69 */ "Found"            OpHelp("key=r[P3@P4]"),
    /*  70 */ "NotExists"        OpHelp("intkey=r[P3]"),
    /*  71 */ "Or"               OpHelp("r[P3]=(r[P1] || r[P2])"),
    /*  72 */ "And"              OpHelp("r[P3]=(r[P1] && r[P2])"),


    /*  73 */ "Sequence"         OpHelp("r[P2]=cursor[P1].ctr++"),
    /*  74 */ "NewRowid"         OpHelp("r[P2]=rowid"),
    /*  75 */ "Insert"           OpHelp("intkey=r[P3] data=r[P2]"),
    /*  76 */ "IsNull"           OpHelp("if r[P1]==NULL goto P2"),
    /*  77 */ "NotNull"          OpHelp("if r[P1]!=NULL goto P2"),
    /*  78 */ "Ne"               OpHelp("if r[P1]!=r[P3] goto P2"),
    /*  79 */ "Eq"               OpHelp("if r[P1]==r[P3] goto P2"),
    /*  80 */ "Gt"               OpHelp("if r[P1]>r[P3] goto P2"),
    /*  81 */ "Le"               OpHelp("if r[P1]<=r[P3] goto P2"),
    /*  82 */ "Lt"               OpHelp("if r[P1]<r[P3] goto P2"),
    /*  83 */ "Ge"               OpHelp("if r[P1]>=r[P3] goto P2"),
    /*  84 */ "InsertInt"        OpHelp("intkey=P3 data=r[P2]"),
    /*  85 */ "BitAnd"           OpHelp("r[P3]=r[P1]&r[P2]"),
    /*  86 */ "BitOr"            OpHelp("r[P3]=r[P1]|r[P2]"),
    /*  87 */ "ShiftLeft"        OpHelp("r[P3]=r[P2]<<r[P1]"),
    /*  88 */ "ShiftRight"       OpHelp("r[P3]=r[P2]>>r[P1]"),
    /*  89 */ "Add"              OpHelp("r[P3]=r[P1]+r[P2]"),
    /*  90 */ "Subtract"         OpHelp("r[P3]=r[P2]-r[P1]"),
    /*  91 */ "Multiply"         OpHelp("r[P3]=r[P1]*r[P2]"),
    /*  92 */ "Divide"           OpHelp("r[P3]=r[P2]/r[P1]"),
    /*  93 */ "Remainder"        OpHelp("r[P3]=r[P2]%r[P1]"),
    /*  94 */ "Concat"           OpHelp("r[P3]=r[P2]+r[P1]"),
    /*  95 */ "Delete"           OpHelp(""),
    /*  96 */ "BitNot"           OpHelp("r[P1]= ~r[P1]"),
    /*  97 */ "String8"          OpHelp("r[P2]='P4'"),


    /*  98 */ "ResetCount"       OpHelp(""),
    /*  99 */ "SorterCompare"    OpHelp("if key(P1)!=trim(r[P3],P4) goto P2"),
    /* 100 */ "SorterData"       OpHelp("r[P2]=data"),
    /* 101 */ "RowKey"           OpHelp("r[P2]=key"),
    /* 102 */ "RowData"          OpHelp("r[P2]=data"),
    /* 103 */ "Rowid"            OpHelp("r[P2]=rowid"),
    /* 104 */ "NullRow"          OpHelp(""),
    /* 105 */ "Last"             OpHelp(""),
    /* 106 */ "SorterSort"       OpHelp(""),
    /* 107 */ "Sort"             OpHelp(""),
    /* 108 */ "Rewind"           OpHelp(""),
    /* 109 */ "SorterInsert"     OpHelp(""),
    /* 110 */ "IdxInsert"        OpHelp("key=r[P2]"),
    /* 111 */ "IdxDelete"        OpHelp("key=r[P2@P3]"),
    /* 112 */ "Seek"             OpHelp("Move P3 to P1.rowid"),
    /* 113 */ "IdxRowid"         OpHelp("r[P2]=rowid"),
    /* 114 */ "IdxLE"            OpHelp("key=r[P3@P4]"),
    /* 115 */ "IdxGT"            OpHelp("key=r[P3@P4]"),
    /* 116 */ "IdxLT"            OpHelp("key=r[P3@P4]"),
    /* 117 */ "IdxGE"            OpHelp("key=r[P3@P4]"),
    /* 118 */ "Destroy"          OpHelp(""),
    /* 119 */ "Clear"            OpHelp(""),
    /* 120 */ "ResetSorter"      OpHelp(""),
    /* 121 */ "CreateIndex"      OpHelp("r[P2]=root iDb=P1"),
    /* 122 */ "CreateTable"      OpHelp("r[P2]=root iDb=P1"),
    /* 123 */ "ParseSchema"      OpHelp(""),
    /* 124 */ "LoadAnalysis"     OpHelp(""),
    /* 125 */ "DropTable"        OpHelp(""),
    /* 126 */ "DropIndex"        OpHelp(""),
    /* 127 */ "DropTrigger"      OpHelp(""),
    /* 128 */ "IntegrityCk"      OpHelp(""),
    /* 129 */ "RowSetAdd"        OpHelp("rowset(P1)=r[P2]"),
    /* 130 */ "RowSetRead"       OpHelp("r[P3]=rowset(P1)"),
    /* 131 */ "RowSetTest"       OpHelp("if r[P3] in rowset(P1) goto P2"),
    /* 132 */ "Program"          OpHelp(""),
    /* 133 */ "Real"             OpHelp("r[P2]=P4"),

    /* 134 */ "Param"            OpHelp(""),
    /* 135 */ "FkCounter"        OpHelp("fkctr[P1]+=P2"),
    /* 136 */ "FkIfZero"         OpHelp("if fkctr[P1]==0 goto P2"),
    /* 137 */ "MemMax"           OpHelp("r[P1]=max(r[P1],r[P2])"),
    /* 138 */ "IfPos"            OpHelp("if r[P1]>0 then r[P1]-=P3, goto P2"),
    /* 139 */ "OffsetLimit"      OpHelp("if r[P1]>0 then r[P2]=r[P1]+max(0,r[P3]) else r[P2]=(-1)"),
    /* 140 */ "IfNotZero"        OpHelp("if r[P1]!=0 then r[P1]-=P3, goto P2"),
    /* 141 */ "DecrJumpZero"     OpHelp("if (--r[P1])==0 goto P2"),
    /* 142 */ "JumpZeroIncr"     OpHelp("if (r[P1]++)==0 ) goto P2"),
    /* 143 */ "AggStep0"         OpHelp("accum=r[P3] step(r[P2@P5])"),
    /* 144 */ "AggStep"          OpHelp("accum=r[P3] step(r[P2@P5])"),
    /* 145 */ "AggFinal"         OpHelp("accum=r[P1] N=P2"),
    /* 146 */ "IncrVacuum"       OpHelp(""),
    /* 147 */ "Expire"           OpHelp(""),
    /* 148 */ "TableLock"        OpHelp("iDb=P1 root=P2 write=P3"),
    /* 149 */ "VBegin"           OpHelp(""),
    /* 150 */ "VCreate"          OpHelp(""),
    /* 151 */ "VDestroy"         OpHelp(""),
    /* 152 */ "VOpen"            OpHelp(""),
    /* 153 */ "VColumn"          OpHelp("r[P3]=vcolumn(P2)"),
    /* 154 */ "VNext"            OpHelp(""),
    /* 155 */ "VRename"          OpHelp(""),
    /* 156 */ "Pagecount"        OpHelp(""),
    /* 157 */ "MaxPgcnt"         OpHelp(""),
    /* 158 */ "Init"             OpHelp("Start at P2"),
    /* 159 */ "CursorHint"       OpHelp(""),
    /* 160 */ "Noop"             OpHelp(""),
    /* 161 */ "Explain"          OpHelp(""),
  };
  return azName[i];
}
#endif

/************** End of opcodes.c *********************************************/
/************** Begin file os_unix.c *****************************************/

#endif

/*
** Maximum supported path-length.
*/
#define MAX_PATHNAME 512

/*
** Maximum supported symbolic links
*/
#define SQLITE_MAX_SYMLINKS 100

/* Always cast the getpid() return type for compatibility with
** kernel modules in VxWorks. */
#define osGetpid(X) (pid_t)getpid()

/*
** Only set the lastErrno if the error code is a real error and not 
** a normal expected return code of SQLITE_BUSY or SQLITE_OK

/*
** Macros for performance tracing.  Normally turned off.  Only works
** on i486 hardware.
*/
#ifdef SQLITE_PERFORMANCE_TRACE

/*
** hwtime.h contains inline assembler code for implementing
** high-performance timing routines.
*/
/************** Include hwtime.h in the middle of os_common.h ****************/
/************** Begin file hwtime.h ******************************************/
/*
** 2008 May 27
**

#endif

/*
** If we compile with the SQLITE_TEST macro set, then the following block
** of code will give us the ability to simulate a disk I/O error.  This
** is used for testing the I/O recovery logic.
*/
#if defined(SQLITE_TEST)
SQLITE_API extern int sqlite3_io_error_hit;
SQLITE_API extern int sqlite3_io_error_hardhit;
SQLITE_API extern int sqlite3_io_error_pending;
SQLITE_API extern int sqlite3_io_error_persist;
SQLITE_API extern int sqlite3_io_error_benign;
SQLITE_API extern int sqlite3_diskfull_pending;
SQLITE_API extern int sqlite3_diskfull;
#define SimulateIOErrorBenign(X) sqlite3_io_error_benign=(X)
#define SimulateIOError(CODE)  \
  if( (sqlite3_io_error_persist && sqlite3_io_error_hit) \
       || sqlite3_io_error_pending-- == 1 )  \
              { local_ioerr(); CODE; }
static void local_ioerr(){
  IOTRACE(("IOERR\n"));

       sqlite3_diskfull_pending--; \
     } \
   }
#else
#define SimulateIOErrorBenign(X)
#define SimulateIOError(A)
#define SimulateDiskfullError(A)
#endif /* defined(SQLITE_TEST) */

/*
** When testing, keep a count of the number of open files.
*/
#if defined(SQLITE_TEST)
SQLITE_API extern int sqlite3_open_file_count;
#define OpenCounter(X)  sqlite3_open_file_count+=(X)
#else
#define OpenCounter(X)
#endif /* defined(SQLITE_TEST) */

#endif /* !defined(_OS_COMMON_H_) */

/************** End of os_common.h *******************************************/
/************** Continuing where we left off in os_unix.c ********************/

/*

  { "mkdir",        (sqlite3_syscall_ptr)mkdir,           0 },
#define osMkdir     ((int(*)(const char*,mode_t))aSyscall[18].pCurrent)

  { "rmdir",        (sqlite3_syscall_ptr)rmdir,           0 },
#define osRmdir     ((int(*)(const char*))aSyscall[19].pCurrent)

#if defined(HAVE_FCHOWN)
  { "fchown",       (sqlite3_syscall_ptr)fchown,          0 },
#else
  { "fchown",       (sqlite3_syscall_ptr)0,               0 },
#endif
#define osFchown    ((int(*)(int,uid_t,gid_t))aSyscall[20].pCurrent)

  { "geteuid",      (sqlite3_syscall_ptr)geteuid,         0 },
#define osGeteuid   ((uid_t(*)(void))aSyscall[21].pCurrent)

#if !defined(SQLITE_OMIT_WAL) || SQLITE_MAX_MMAP_SIZE>0
  { "mmap",         (sqlite3_syscall_ptr)mmap,            0 },
#else
  { "mmap",         (sqlite3_syscall_ptr)0,               0 },
#endif
#define osMmap ((void*(*)(void*,size_t,int,int,int,off_t))aSyscall[22].pCurrent)

#if !defined(SQLITE_OMIT_WAL) || SQLITE_MAX_MMAP_SIZE>0
  { "munmap",       (sqlite3_syscall_ptr)munmap,          0 },
#else
  { "munmap",       (sqlite3_syscall_ptr)0,               0 },
#endif
#define osMunmap ((void*(*)(void*,size_t))aSyscall[23].pCurrent)

#if HAVE_MREMAP && (!defined(SQLITE_OMIT_WAL) || SQLITE_MAX_MMAP_SIZE>0)
  { "mremap",       (sqlite3_syscall_ptr)mremap,          0 },
#else
  { "mremap",       (sqlite3_syscall_ptr)0,               0 },
#endif
#define osMremap ((void*(*)(void*,size_t,size_t,int,...))aSyscall[24].pCurrent)

#if !defined(SQLITE_OMIT_WAL) || SQLITE_MAX_MMAP_SIZE>0
  { "getpagesize",  (sqlite3_syscall_ptr)unixGetpagesize, 0 },
#else
  { "getpagesize",  (sqlite3_syscall_ptr)0,               0 },
#endif
#define osGetpagesize ((int(*)(void))aSyscall[25].pCurrent)

#if defined(HAVE_READLINK)
  { "readlink",     (sqlite3_syscall_ptr)readlink,        0 },
#else
  { "readlink",     (sqlite3_syscall_ptr)0,               0 },
#endif
#define osReadlink ((ssize_t(*)(const char*,char*,size_t))aSyscall[26].pCurrent)

#if defined(HAVE_LSTAT)
  { "lstat",         (sqlite3_syscall_ptr)lstat,          0 },
#else
  { "lstat",         (sqlite3_syscall_ptr)0,              0 },
#endif
#define osLstat      ((int(*)(const char*,struct stat*))aSyscall[27].pCurrent)

}; /* End of the overrideable system calls */


/*
** On some systems, calls to fchown() will trigger a message in a security
** log if they come from non-root processes.  So avoid calling fchown() if
** we are not running as root.
*/
static int robustFchown(int fd, uid_t uid, gid_t gid){
#if defined(HAVE_FCHOWN)
  return osGeteuid() ? 0 : osFchown(fd,uid,gid);
#else
  return 0;
#endif
}

/*
** This is the xSetSystemCall() method of sqlite3_vfs for all of the
** "unix" VFSes.  Return SQLITE_OK opon successfully updating the
** system call pointer, or SQLITE_NOTFOUND if there is no configurable

    return rc;
  }
#ifndef SQLITE_DISABLE_DIRSYNC
  if( (dirSync & 1)!=0 ){
    int fd;
    rc = osOpenDirectory(zPath, &fd);
    if( rc==SQLITE_OK ){



      if( full_fsync(fd,0,0) ){


        rc = unixLogError(SQLITE_IOERR_DIR_FSYNC, "fsync", zPath);
      }
      robust_close(0, fd, __LINE__);
    }else{
      assert( rc==SQLITE_CANTOPEN );
      rc = SQLITE_OK;
    }

    *pResOut = (0==osStat(zPath, &buf) && buf.st_size>0);
  }else{
    *pResOut = osAccess(zPath, W_OK|R_OK)==0;
  }
  return SQLITE_OK;
}

/*
**
*/
static int mkFullPathname(
  const char *zPath,              /* Input path */
  char *zOut,                     /* Output buffer */
  int nOut                        /* Allocated size of buffer zOut */
){
  int nPath = sqlite3Strlen30(zPath);
  int iOff = 0;
  if( zPath[0]!='/' ){
    if( osGetcwd(zOut, nOut-2)==0 ){
      return unixLogError(SQLITE_CANTOPEN_BKPT, "getcwd", zPath);
    }
    iOff = sqlite3Strlen30(zOut);
    zOut[iOff++] = '/';
  }
  if( (iOff+nPath+1)>nOut ){
    /* SQLite assumes that xFullPathname() nul-terminates the output buffer
    ** even if it returns an error.  */
    zOut[iOff] = '\0';
    return SQLITE_CANTOPEN_BKPT;
  }
  sqlite3_snprintf(nOut-iOff, &zOut[iOff], "%s", zPath);
  return SQLITE_OK;
}

/*
** Turn a relative pathname into a full pathname. The relative path
** is stored as a nul-terminated string in the buffer pointed to by
** zPath. 
**
** zOut points to a buffer of at least sqlite3_vfs.mxPathname bytes 
** (in this case, MAX_PATHNAME bytes). The full-path is written to
** this buffer before returning.
*/
static int unixFullPathname(
  sqlite3_vfs *pVfs,            /* Pointer to vfs object */
  const char *zPath,            /* Possibly relative input path */
  int nOut,                     /* Size of output buffer in bytes */
  char *zOut                    /* Output buffer */
){
#if !defined(HAVE_READLINK) || !defined(HAVE_LSTAT)
  return mkFullPathname(zPath, zOut, nOut);
#else
  int rc = SQLITE_OK;
  int nByte;
  int nLink = 1;                /* Number of symbolic links followed so far */
  const char *zIn = zPath;      /* Input path for each iteration of loop */
  char *zDel = 0;

  assert( pVfs->mxPathname==MAX_PATHNAME );
  UNUSED_PARAMETER(pVfs);

  /* It's odd to simulate an io-error here, but really this is just
  ** using the io-error infrastructure to test that SQLite handles this
  ** function failing. This function could fail if, for example, the
  ** current working directory has been unlinked.
  */
  SimulateIOError( return SQLITE_ERROR );

  do {


    /* Call stat() on path zIn. Set bLink to true if the path is a symbolic
    ** link, or false otherwise.  */



    int bLink = 0;
    struct stat buf;
    if( osLstat(zIn, &buf)!=0 ){
      if( errno!=ENOENT ){
        rc = unixLogError(SQLITE_CANTOPEN_BKPT, "lstat", zIn);
      }


    }else{
      bLink = S_ISLNK(buf.st_mode);
    }





    if( bLink ){




      if( zDel==0 ){
        zDel = sqlite3_malloc(nOut);
        if( zDel==0 ) rc = SQLITE_NOMEM;
      }else if( ++nLink>SQLITE_MAX_SYMLINKS ){
        rc = SQLITE_CANTOPEN_BKPT;
      }





      if( rc==SQLITE_OK ){
        nByte = osReadlink(zIn, zDel, nOut-1);
        if( nByte<0 ){
          rc = unixLogError(SQLITE_CANTOPEN_BKPT, "readlink", zIn);
        }else{
          if( zDel[0]!='/' ){
            int n;
            for(n = sqlite3Strlen30(zIn); n>0 && zIn[n-1]!='/'; n--);
            if( nByte+n+1>nOut ){
              rc = SQLITE_CANTOPEN_BKPT;
            }else{
              memmove(&zDel[n], zDel, nByte+1);
              memcpy(zDel, zIn, n);
              nByte += n;
            }
          }
          zDel[nByte] = '\0';
        }
      }


      zIn = zDel;
    }

    assert( rc!=SQLITE_OK || zIn!=zOut || zIn[0]=='/' );
    if( rc==SQLITE_OK && zIn!=zOut ){

      rc = mkFullPathname(zIn, zOut, nOut);
    }
    if( bLink==0 ) break;
    zIn = zOut;
  }while( rc==SQLITE_OK );

  sqlite3_free(zDel);
  return rc;
#endif   /* HAVE_READLINK && HAVE_LSTAT */
}


#ifndef SQLITE_OMIT_LOAD_EXTENSION
/*
** Interfaces for opening a shared library, finding entry points
** within the shared library, and closing the shared library.

    *piNow = 1000*(sqlite3_int64)sqlite3_current_time + unixEpoch;
  }
#endif
  UNUSED_PARAMETER(NotUsed);
  return rc;
}

#ifndef SQLITE_OMIT_DEPRECATED
/*
** Find the current time (in Universal Coordinated Time).  Write the
** current time and date as a Julian Day number into *prNow and
** return 0.  Return 1 if the time and date cannot be found.
*/
static int unixCurrentTime(sqlite3_vfs *NotUsed, double *prNow){
  sqlite3_int64 i = 0;
  int rc;
  UNUSED_PARAMETER(NotUsed);
  rc = unixCurrentTimeInt64(0, &i);
  *prNow = i/86400000.0;
  return rc;
}
#else
# define unixCurrentTime 0
#endif

#ifndef SQLITE_OMIT_DEPRECATED
/*
** We added the xGetLastError() method with the intention of providing
** better low-level error messages when operating-system problems come up
** during SQLite operation.  But so far, none of that has been implemented
** in the core.  So this routine is never called.  For now, it is merely
** a place-holder.
*/

                  MAXPATHLEN);
        }else{
          strlcpy(&writeBuffer[PROXY_PATHINDEX], tempLockPath, MAXPATHLEN);
        }
        writeSize = PROXY_PATHINDEX + strlen(&writeBuffer[PROXY_PATHINDEX]);
        robust_ftruncate(conchFile->h, writeSize);
        rc = unixWrite((sqlite3_file *)conchFile, writeBuffer, writeSize, 0);
        full_fsync(conchFile->h,0,0);
        /* If we created a new conch file (not just updated the contents of a 
         ** valid conch file), try to match the permissions of the database 
         */
        if( rc==SQLITE_OK && createConch ){
          struct stat buf;
          int err = osFstat(pFile->h, &buf);
          if( err==0 ){

    UNIXVFS("unix-proxy",    proxyIoFinder ),
#endif
  };
  unsigned int i;          /* Loop counter */

  /* Double-check that the aSyscall[] array has been constructed
  ** correctly.  See ticket [bb3a86e890c8e96ab] */
  assert( ArraySize(aSyscall)==28 );

  /* Register all VFSes defined in the aVfs[] array */
  for(i=0; i<(sizeof(aVfs)/sizeof(sqlite3_vfs)); i++){
    sqlite3_vfs_register(&aVfs[i], i==0);
  }
  return SQLITE_OK; 
}

/*
** Macros for performance tracing.  Normally turned off.  Only works
** on i486 hardware.
*/
#ifdef SQLITE_PERFORMANCE_TRACE

/*
** hwtime.h contains inline assembler code for implementing
** high-performance timing routines.
*/
/************** Include hwtime.h in the middle of os_common.h ****************/
/************** Begin file hwtime.h ******************************************/
/*
** 2008 May 27
**

#endif

/*
** If we compile with the SQLITE_TEST macro set, then the following block
** of code will give us the ability to simulate a disk I/O error.  This
** is used for testing the I/O recovery logic.
*/
#if defined(SQLITE_TEST)
SQLITE_API extern int sqlite3_io_error_hit;
SQLITE_API extern int sqlite3_io_error_hardhit;
SQLITE_API extern int sqlite3_io_error_pending;
SQLITE_API extern int sqlite3_io_error_persist;
SQLITE_API extern int sqlite3_io_error_benign;
SQLITE_API extern int sqlite3_diskfull_pending;
SQLITE_API extern int sqlite3_diskfull;
#define SimulateIOErrorBenign(X) sqlite3_io_error_benign=(X)
#define SimulateIOError(CODE)  \
  if( (sqlite3_io_error_persist && sqlite3_io_error_hit) \
       || sqlite3_io_error_pending-- == 1 )  \
              { local_ioerr(); CODE; }
static void local_ioerr(){
  IOTRACE(("IOERR\n"));

       sqlite3_diskfull_pending--; \
     } \
   }
#else
#define SimulateIOErrorBenign(X)
#define SimulateIOError(A)
#define SimulateDiskfullError(A)
#endif /* defined(SQLITE_TEST) */

/*
** When testing, keep a count of the number of open files.
*/
#if defined(SQLITE_TEST)
SQLITE_API extern int sqlite3_open_file_count;
#define OpenCounter(X)  sqlite3_open_file_count+=(X)
#else
#define OpenCounter(X)
#endif /* defined(SQLITE_TEST) */

#endif /* !defined(_OS_COMMON_H_) */

/************** End of os_common.h *******************************************/
/************** Continuing where we left off in os_win.c *********************/

/*

#  define NTDDI_WIN8                        0x06020000
#endif

#ifndef NTDDI_WINBLUE
#  define NTDDI_WINBLUE                     0x06030000
#endif

#ifndef NTDDI_WINTHRESHOLD
#  define NTDDI_WINTHRESHOLD                0x06040000
#endif

/*
** Check to see if the GetVersionEx[AW] functions are deprecated on the
** target system.  GetVersionEx was first deprecated in Win8.1.
*/
#ifndef SQLITE_WIN32_GETVERSIONEX
#  if defined(NTDDI_VERSION) && NTDDI_VERSION >= NTDDI_WINBLUE
#    define SQLITE_WIN32_GETVERSIONEX   0   /* GetVersionEx() is deprecated */
#  else
#    define SQLITE_WIN32_GETVERSIONEX   1   /* GetVersionEx() is current */
#  endif
#endif

/*
** Check to see if the CreateFileMappingA function is supported on the
** target system.  It is unavailable when using "mincore.lib" on Win10.
** When compiling for Windows 10, always assume "mincore.lib" is in use.
*/
#ifndef SQLITE_WIN32_CREATEFILEMAPPINGA
#  if defined(NTDDI_VERSION) && NTDDI_VERSION >= NTDDI_WINTHRESHOLD
#    define SQLITE_WIN32_CREATEFILEMAPPINGA   0
#  else
#    define SQLITE_WIN32_CREATEFILEMAPPINGA   1
#  endif
#endif

/*
** This constant should already be defined (in the "WinDef.h" SDK file).
*/
#ifndef MAX_PATH
#  define MAX_PATH                      (260)
#endif

#else
  { "CreateFileW",             (SYSCALL)0,                       0 },
#endif

#define osCreateFileW ((HANDLE(WINAPI*)(LPCWSTR,DWORD,DWORD, \
        LPSECURITY_ATTRIBUTES,DWORD,DWORD,HANDLE))aSyscall[5].pCurrent)

#if !SQLITE_OS_WINRT && defined(SQLITE_WIN32_HAS_ANSI) && \
        (!defined(SQLITE_OMIT_WAL) || SQLITE_MAX_MMAP_SIZE>0) && \
        SQLITE_WIN32_CREATEFILEMAPPINGA
  { "CreateFileMappingA",      (SYSCALL)CreateFileMappingA,      0 },
#else
  { "CreateFileMappingA",      (SYSCALL)0,                       0 },
#endif

#define osCreateFileMappingA ((HANDLE(WINAPI*)(HANDLE,LPSECURITY_ATTRIBUTES, \
        DWORD,DWORD,DWORD,LPCSTR))aSyscall[6].pCurrent)

  { "GetTickCount",            (SYSCALL)GetTickCount,            0 },
#else
  { "GetTickCount",            (SYSCALL)0,                       0 },
#endif

#define osGetTickCount ((DWORD(WINAPI*)(VOID))aSyscall[33].pCurrent)

#if defined(SQLITE_WIN32_HAS_ANSI) && SQLITE_WIN32_GETVERSIONEX

  { "GetVersionExA",           (SYSCALL)GetVersionExA,           0 },
#else
  { "GetVersionExA",           (SYSCALL)0,                       0 },
#endif

#define osGetVersionExA ((BOOL(WINAPI*)( \
        LPOSVERSIONINFOA))aSyscall[34].pCurrent)

#if !SQLITE_OS_WINRT && defined(SQLITE_WIN32_HAS_WIDE) && \
        SQLITE_WIN32_GETVERSIONEX
  { "GetVersionExW",           (SYSCALL)GetVersionExW,           0 },
#else
  { "GetVersionExW",           (SYSCALL)0,                       0 },
#endif

#define osGetVersionExW ((BOOL(WINAPI*)( \
        LPOSVERSIONINFOW))aSyscall[35].pCurrent)

** the LockFileEx() API.  But we can still statically link against that
** API as long as we don't call it when running Win95/98/ME.  A call to
** this routine is used to determine if the host is Win95/98/ME or
** WinNT/2K/XP so that we will know whether or not we can safely call
** the LockFileEx() API.
*/

#if !SQLITE_WIN32_GETVERSIONEX
# define osIsNT()  (1)
#elif SQLITE_OS_WINCE || SQLITE_OS_WINRT || !defined(SQLITE_WIN32_HAS_ANSI)
# define osIsNT()  (1)
#elif !defined(SQLITE_WIN32_HAS_WIDE)
# define osIsNT()  (0)
#else
# define osIsNT()  ((sqlite3_os_type==2) || sqlite3_win32_is_nt())
#endif

/*
** This function determines if the machine is running a version of Windows
** based on the NT kernel.
*/
SQLITE_API int SQLITE_STDCALL sqlite3_win32_is_nt(void){
#if SQLITE_OS_WINRT
  /*
  ** NOTE: The WinRT sub-platform is always assumed to be based on the NT
  **       kernel.
  */
  return 1;
#elif SQLITE_WIN32_GETVERSIONEX
  if( osInterlockedCompareExchange(&sqlite3_os_type, 0, 0)==0 ){
#if defined(SQLITE_WIN32_HAS_ANSI)
    OSVERSIONINFOA sInfo;
    sInfo.dwOSVersionInfoSize = sizeof(sInfo);
    osGetVersionExA(&sInfo);
    osInterlockedCompareExchange(&sqlite3_os_type,
        (sInfo.dwPlatformId == VER_PLATFORM_WIN32_NT) ? 2 : 1, 0);

      hMap = osCreateFileMappingFromApp(pShmNode->hFile.h,
          NULL, PAGE_READWRITE, nByte, NULL
      );
#elif defined(SQLITE_WIN32_HAS_WIDE)
      hMap = osCreateFileMappingW(pShmNode->hFile.h,
          NULL, PAGE_READWRITE, 0, nByte, NULL
      );
#elif defined(SQLITE_WIN32_HAS_ANSI) && SQLITE_WIN32_CREATEFILEMAPPINGA
      hMap = osCreateFileMappingA(pShmNode->hFile.h,
          NULL, PAGE_READWRITE, 0, nByte, NULL
      );
#endif
      OSTRACE(("SHM-MAP-CREATE pid=%lu, region=%d, size=%d, rc=%s\n",
               osGetCurrentProcessId(), pShmNode->nRegion, nByte,
               hMap ? "ok" : "failed"));

#endif
#if SQLITE_OS_WINRT
    pFd->hMap = osCreateFileMappingFromApp(pFd->h, NULL, protect, nMap, NULL);
#elif defined(SQLITE_WIN32_HAS_WIDE)
    pFd->hMap = osCreateFileMappingW(pFd->h, NULL, protect,
                                (DWORD)((nMap>>32) & 0xffffffff),
                                (DWORD)(nMap & 0xffffffff), NULL);
#elif defined(SQLITE_WIN32_HAS_ANSI) && SQLITE_WIN32_CREATEFILEMAPPINGA
    pFd->hMap = osCreateFileMappingA(pFd->h, NULL, protect,
                                (DWORD)((nMap>>32) & 0xffffffff),
                                (DWORD)(nMap & 0xffffffff), NULL);
#endif
    if( pFd->hMap==NULL ){
      pFd->lastErrno = osGetLastError();
      rc = winLogError(SQLITE_IOERR_MMAP, pFd->lastErrno,

** In an OOM situation, the RowSet.db->mallocFailed flag is set and this
** routine returns NULL.
*/
static struct RowSetEntry *rowSetEntryAlloc(RowSet *p){
  assert( p!=0 );
  if( p->nFresh==0 ){
    struct RowSetChunk *pNew;
    pNew = sqlite3DbMallocRawNN(p->db, sizeof(*pNew));
    if( pNew==0 ){
      return 0;
    }
    pNew->pNextChunk = p->pChunk;
    p->pChunk = pNew;
    p->pFresh = pNew->aEntry;
    p->nFresh = ROWSET_ENTRY_PER_CHUNK;

/*
** The maximum allowed sector size. 64KiB. If the xSectorsize() method 
** returns a value larger than this, then MAX_SECTOR_SIZE is used instead.
** This could conceivably cause corruption following a power failure on
** such a system. This is currently an undocumented limit.
*/
#define MAX_SECTOR_SIZE 0x10000

/*
** If the option SQLITE_EXTRA_DURABLE option is set at compile-time, then
** SQLite will do extra fsync() operations when synchronous==FULL to help
** ensure that transactions are durable across a power failure.  Most
** applications are happy as long as transactions are consistent across
** a power failure, and are perfectly willing to lose the last transaction
** in exchange for the extra performance of avoiding directory syncs.
** And so the default SQLITE_EXTRA_DURABLE setting is off.
*/
#ifndef SQLITE_EXTRA_DURABLE
# define SQLITE_EXTRA_DURABLE 0
#endif


/*
** An instance of the following structure is allocated for each active
** savepoint and statement transaction in the system. All such structures
** are stored in the Pager.aSavepoint[] array, which is allocated and
** resized using sqlite3Realloc().
**

struct Pager {
  sqlite3_vfs *pVfs;          /* OS functions to use for IO */
  u8 exclusiveMode;           /* Boolean. True if locking_mode==EXCLUSIVE */
  u8 journalMode;             /* One of the PAGER_JOURNALMODE_* values */
  u8 useJournal;              /* Use a rollback journal on this file */
  u8 noSync;                  /* Do not sync the journal if true */
  u8 fullSync;                /* Do extra syncs of the journal for robustness */
  u8 extraSync;               /* sync directory after journal delete */
  u8 ckptSyncFlags;           /* SYNC_NORMAL or SYNC_FULL for checkpoint */
  u8 walSyncFlags;            /* SYNC_NORMAL or SYNC_FULL for wal writes */
  u8 syncFlags;               /* SYNC_NORMAL or SYNC_FULL otherwise */
  u8 tempFile;                /* zFilename is a temporary or immutable file */
  u8 noLock;                  /* Do not lock (except in WAL mode) */
  u8 readOnly;                /* True for a read-only database */
  u8 memDb;                   /* True to inhibit all file I/O */

      int bDelete = (!pPager->tempFile && sqlite3JournalExists(pPager->jfd));
      assert( pPager->journalMode==PAGER_JOURNALMODE_DELETE 
           || pPager->journalMode==PAGER_JOURNALMODE_MEMORY 
           || pPager->journalMode==PAGER_JOURNALMODE_WAL 
      );
      sqlite3OsClose(pPager->jfd);
      if( bDelete ){
        rc = sqlite3OsDelete(pPager->pVfs, pPager->zJournal, pPager->extraSync);
      }
    }
  }

#ifdef SQLITE_CHECK_PAGES
  sqlite3PcacheIterateDirty(pPager->pPCache, pager_set_pagehash);
  if( pPager->dbSize==0 && sqlite3PcacheRefCount(pPager->pPCache)>0 ){

*/
#ifndef SQLITE_OMIT_PAGER_PRAGMAS
SQLITE_PRIVATE void sqlite3PagerSetFlags(
  Pager *pPager,        /* The pager to set safety level for */
  unsigned pgFlags      /* Various flags */
){
  unsigned level = pgFlags & PAGER_SYNCHRONOUS_MASK;
  if( pPager->tempFile ){
    pPager->noSync = 1;
    pPager->fullSync = 0;
    pPager->extraSync = 0;
  }else{
    pPager->noSync =  level==PAGER_SYNCHRONOUS_OFF ?1:0;
    pPager->fullSync = level>=PAGER_SYNCHRONOUS_FULL ?1:0;
    pPager->extraSync = level==PAGER_SYNCHRONOUS_EXTRA ?1:0;
  }
  if( pPager->noSync ){
    pPager->syncFlags = 0;
    pPager->ckptSyncFlags = 0;
  }else if( pgFlags & PAGER_FULLFSYNC ){
    pPager->syncFlags = SQLITE_SYNC_FULL;
    pPager->ckptSyncFlags = SQLITE_SYNC_FULL;
  }else if( pgFlags & PAGER_CKPT_FULLFSYNC ){

  pPager->changeCountDone = pPager->tempFile;
  pPager->memDb = (u8)memDb;
  pPager->readOnly = (u8)readOnly;
  assert( useJournal || pPager->tempFile );
  pPager->noSync = pPager->tempFile;
  if( pPager->noSync ){
    assert( pPager->fullSync==0 );
    assert( pPager->extraSync==0 );
    assert( pPager->syncFlags==0 );
    assert( pPager->walSyncFlags==0 );
    assert( pPager->ckptSyncFlags==0 );
  }else{
    pPager->fullSync = 1;
#if SQLITE_EXTRA_DURABLE
    pPager->extraSync = 1;
#else
    pPager->extraSync = 0;
#endif
    pPager->syncFlags = SQLITE_SYNC_NORMAL;
    pPager->walSyncFlags = SQLITE_SYNC_NORMAL | WAL_SYNC_TRANSACTIONS;
    pPager->ckptSyncFlags = SQLITE_SYNC_NORMAL;
  }
  /* pPager->pFirst = 0; */
  /* pPager->pFirstSynced = 0; */
  /* pPager->pLast = 0; */

  u8 ckptLock;               /* True if holding a checkpoint lock */
  u8 readOnly;               /* WAL_RDWR, WAL_RDONLY, or WAL_SHM_RDONLY */
  u8 truncateOnCommit;       /* True to truncate WAL file on commit */
  u8 syncHeader;             /* Fsync the WAL header if true */
  u8 padToSectorBoundary;    /* Pad transactions out to the next sector */
  WalIndexHdr hdr;           /* Wal-index header for current transaction */
  u32 minFrame;              /* Ignore wal frames before this one */
  u32 iReCksum;              /* On commit, recalculate checksums from here */
  const char *zWalName;      /* Name of WAL file */
  u32 nCkpt;                 /* Checkpoint sequence counter in the wal-header */
#ifdef SQLITE_DEBUG
  u8 lockError;              /* True if a locking error has occurred */
#endif
#ifdef SQLITE_ENABLE_SNAPSHOT
  WalIndexHdr *pSnapshot;    /* Start transaction here if not NULL */

  u8 *aFrame                      /* OUT: Write encoded frame here */
){
  int nativeCksum;                /* True for native byte-order checksums */
  u32 *aCksum = pWal->hdr.aFrameCksum;
  assert( WAL_FRAME_HDRSIZE==24 );
  sqlite3Put4byte(&aFrame[0], iPage);
  sqlite3Put4byte(&aFrame[4], nTruncate);
  if( pWal->iReCksum==0 ){
    memcpy(&aFrame[8], pWal->hdr.aSalt, 8);

    nativeCksum = (pWal->hdr.bigEndCksum==SQLITE_BIGENDIAN);
    walChecksumBytes(nativeCksum, aFrame, 8, aCksum, aCksum);
    walChecksumBytes(nativeCksum, aData, pWal->szPage, aCksum, aCksum);

    sqlite3Put4byte(&aFrame[16], aCksum[0]);
    sqlite3Put4byte(&aFrame[20], aCksum[1]);
  }else{
    memset(&aFrame[8], 0, 16);
  }
}

/*
** Check to see if the frame with header in aFrame[] and content
** in aData[] is valid.  If it is a valid frame, fill *piPage and
** *pnTruncate and return true.  Return if the frame is not valid.
*/

*/
SQLITE_PRIVATE int sqlite3WalBeginWriteTransaction(Wal *pWal){
  int rc;

  /* Cannot start a write transaction without first holding a read
  ** transaction. */
  assert( pWal->readLock>=0 );
  assert( pWal->writeLock==0 && pWal->iReCksum==0 );

  if( pWal->readOnly ){
    return SQLITE_READONLY;
  }

  /* Only one writer allowed at a time.  Get the write lock.  Return
  ** SQLITE_BUSY if unable.

** End a write transaction.  The commit has already been done.  This
** routine merely releases the lock.
*/
SQLITE_PRIVATE int sqlite3WalEndWriteTransaction(Wal *pWal){
  if( pWal->writeLock ){
    walUnlockExclusive(pWal, WAL_WRITE_LOCK, 1);
    pWal->writeLock = 0;
    pWal->iReCksum = 0;
    pWal->truncateOnCommit = 0;
  }
  return SQLITE_OK;
}

/*
** If any data has been written (but not committed) to the log file, this

  walEncodeFrame(p->pWal, pPage->pgno, nTruncate, pData, aFrame);
  rc = walWriteToLog(p, aFrame, sizeof(aFrame), iOffset);
  if( rc ) return rc;
  /* Write the page data */
  rc = walWriteToLog(p, pData, p->szPage, iOffset+sizeof(aFrame));
  return rc;
}

/*
** This function is called as part of committing a transaction within which
** one or more frames have been overwritten. It updates the checksums for
** all frames written to the wal file by the current transaction starting
** with the earliest to have been overwritten.
**
** SQLITE_OK is returned if successful, or an SQLite error code otherwise.
*/
static int walRewriteChecksums(Wal *pWal, u32 iLast){
  const int szPage = pWal->szPage;/* Database page size */
  int rc = SQLITE_OK;             /* Return code */
  u8 *aBuf;                       /* Buffer to load data from wal file into */
  u8 aFrame[WAL_FRAME_HDRSIZE];   /* Buffer to assemble frame-headers in */
  u32 iRead;                      /* Next frame to read from wal file */
  i64 iCksumOff;

  aBuf = sqlite3_malloc(szPage + WAL_FRAME_HDRSIZE);
  if( aBuf==0 ) return SQLITE_NOMEM;

  /* Find the checksum values to use as input for the recalculating the
  ** first checksum. If the first frame is frame 1 (implying that the current
  ** transaction restarted the wal file), these values must be read from the
  ** wal-file header. Otherwise, read them from the frame header of the
  ** previous frame.  */
  assert( pWal->iReCksum>0 );
  if( pWal->iReCksum==1 ){
    iCksumOff = 24;
  }else{
    iCksumOff = walFrameOffset(pWal->iReCksum-1, szPage) + 16;
  }
  rc = sqlite3OsRead(pWal->pWalFd, aBuf, sizeof(u32)*2, iCksumOff);
  pWal->hdr.aFrameCksum[0] = sqlite3Get4byte(aBuf);
  pWal->hdr.aFrameCksum[1] = sqlite3Get4byte(&aBuf[sizeof(u32)]);

  iRead = pWal->iReCksum;
  pWal->iReCksum = 0;
  for(; rc==SQLITE_OK && iRead<=iLast; iRead++){
    i64 iOff = walFrameOffset(iRead, szPage);
    rc = sqlite3OsRead(pWal->pWalFd, aBuf, szPage+WAL_FRAME_HDRSIZE, iOff);
    if( rc==SQLITE_OK ){
      u32 iPgno, nDbSize;
      iPgno = sqlite3Get4byte(aBuf);
      nDbSize = sqlite3Get4byte(&aBuf[4]);

      walEncodeFrame(pWal, iPgno, nDbSize, &aBuf[WAL_FRAME_HDRSIZE], aFrame);
      rc = sqlite3OsWrite(pWal->pWalFd, aFrame, sizeof(aFrame), iOff);
    }
  }

  sqlite3_free(aBuf);
  return rc;
}

/* 
** Write a set of frames to the log. The caller must hold the write-lock
** on the log file (obtained using sqlite3WalBeginWriteTransaction()).
*/
SQLITE_PRIVATE int sqlite3WalFrames(
  Wal *pWal,                      /* Wal handle to write to */

  u32 iFrame;                     /* Next frame address */
  PgHdr *p;                       /* Iterator to run through pList with. */
  PgHdr *pLast = 0;               /* Last frame in list */
  int nExtra = 0;                 /* Number of extra copies of last page */
  int szFrame;                    /* The size of a single frame */
  i64 iOffset;                    /* Next byte to write in WAL file */
  WalWriter w;                    /* The writer */
  u32 iFirst = 0;                 /* First frame that may be overwritten */
  WalIndexHdr *pLive;             /* Pointer to shared header */

  assert( pList );
  assert( pWal->writeLock );

  /* If this frame set completes a transaction, then nTruncate>0.  If
  ** nTruncate==0 then this frame set does not complete the transaction. */
  assert( (isCommit!=0)==(nTruncate!=0) );

#if defined(SQLITE_TEST) && defined(SQLITE_DEBUG)
  { int cnt; for(cnt=0, p=pList; p; p=p->pDirty, cnt++){}
    WALTRACE(("WAL%p: frame write begin. %d frames. mxFrame=%d. %s\n",
              pWal, cnt, pWal->hdr.mxFrame, isCommit ? "Commit" : "Spill"));
  }
#endif

  pLive = (WalIndexHdr*)walIndexHdr(pWal);
  if( memcmp(&pWal->hdr, (void *)pLive, sizeof(WalIndexHdr))!=0 ){
    iFirst = pLive->mxFrame+1;
  }

  /* See if it is possible to write these frames into the start of the
  ** log file, instead of appending to it at pWal->hdr.mxFrame.
  */
  if( SQLITE_OK!=(rc = walRestartLog(pWal)) ){
    return rc;
  }

  w.szPage = szPage;
  iOffset = walFrameOffset(iFrame+1, szPage);
  szFrame = szPage + WAL_FRAME_HDRSIZE;

  /* Write all frames into the log file exactly once */
  for(p=pList; p; p=p->pDirty){
    int nDbSize;   /* 0 normally.  Positive == commit flag */

    /* Check if this page has already been written into the wal file by
    ** the current transaction. If so, overwrite the existing frame and
    ** set Wal.writeLock to WAL_WRITELOCK_RECKSUM - indicating that 
    ** checksums must be recomputed when the transaction is committed.  */
    if( iFirst && (p->pDirty || isCommit==0) ){
      u32 iWrite = 0;
      VVA_ONLY(rc =) sqlite3WalFindFrame(pWal, p->pgno, &iWrite);
      assert( rc==SQLITE_OK || iWrite==0 );
      if( iWrite>=iFirst ){
        i64 iOff = walFrameOffset(iWrite, szPage) + WAL_FRAME_HDRSIZE;
        if( pWal->iReCksum==0 || iWrite<pWal->iReCksum ){
          pWal->iReCksum = iWrite;
        }
        rc = sqlite3OsWrite(pWal->pWalFd, p->pData, szPage, iOff);
        if( rc ) return rc;
        p->flags &= ~PGHDR_WAL_APPEND;
        continue;
      }
    }

    iFrame++;
    assert( iOffset==walFrameOffset(iFrame, szPage) );
    nDbSize = (isCommit && p->pDirty==0) ? nTruncate : 0;
    rc = walWriteOneFrame(&w, p, nDbSize, iOffset);
    if( rc ) return rc;
    pLast = p;
    iOffset += szFrame;
    p->flags |= PGHDR_WAL_APPEND;
  }

  /* Recalculate checksums within the wal file if required. */
  if( isCommit && pWal->iReCksum ){
    rc = walRewriteChecksums(pWal, iFrame);
    if( rc ) return rc;
  }

  /* If this is the end of a transaction, then we might need to pad
  ** the transaction and/or sync the WAL file.
  **
  ** Padding and syncing only occur if this set of frames complete a
  ** transaction and if PRAGMA synchronous=FULL.  If synchronous==NORMAL

  /* Append data to the wal-index. It is not necessary to lock the 
  ** wal-index to do this as the SQLITE_SHM_WRITE lock held on the wal-index
  ** guarantees that there are no other writers, and no data that may
  ** be in use by existing readers is being overwritten.
  */
  iFrame = pWal->hdr.mxFrame;
  for(p=pList; p && rc==SQLITE_OK; p=p->pDirty){
    if( (p->flags & PGHDR_WAL_APPEND)==0 ) continue;
    iFrame++;
    rc = walIndexAppend(pWal, iFrame, p->pgno);
  }
  while( rc==SQLITE_OK && nExtra>0 ){
    iFrame++;
    nExtra--;
    rc = walIndexAppend(pWal, iFrame, pLast->pgno);

    if( isChanged && pWal->pDbFd->pMethods->iVersion>=3 ){
      sqlite3OsUnfetch(pWal->pDbFd, 0, 0);
    }
  }

  /* Copy data from the log to the database file. */
  if( rc==SQLITE_OK ){

    if( pWal->hdr.mxFrame && walPagesize(pWal)!=nBuf ){
      rc = SQLITE_CORRUPT_BKPT;
    }else{
      rc = walCheckpoint(pWal, eMode2, xBusy2, pBusyArg, sync_flags, zBuf);
    }

    /* If no error occurred, set the output variables. */

** stored in MemPage.pBt->mutex.
*/
struct MemPage {
  u8 isInit;           /* True if previously initialized. MUST BE FIRST! */
  u8 nOverflow;        /* Number of overflow cell bodies in aCell[] */
  u8 intKey;           /* True if table b-trees.  False for index b-trees */
  u8 intKeyLeaf;       /* True if the leaf of an intKey table */

  u8 leaf;             /* True if a leaf page */
  u8 hdrOffset;        /* 100 for page 1.  0 otherwise */
  u8 childPtrSize;     /* 0 if leaf==1.  4 if leaf==0 */
  u8 max1bytePayload;  /* min(maxLocal,127) */
  u8 bBusy;            /* Prevent endless loops on corrupt database files */
  u16 maxLocal;        /* Copy of BtShared.maxLocal or BtShared.maxLeaf */
  u16 minLocal;        /* Copy of BtShared.minLocal or BtShared.minLeaf */

  assert( p->sharable==0 || p->locked==0 || sqlite3_mutex_held(p->pBt->mutex) );
  assert( p->sharable==0 || p->locked==0 || sqlite3_mutex_held(p->db->mutex) );

  return (p->sharable==0 || p->locked);
}
#endif

















/*
** Enter the mutex on every Btree associated with a database
** connection.  This is needed (for example) prior to parsing
** a statement since we will be comparing table and column names
** against all schemas and we do not want those schemas being
** reset out from under us.

  assert( sqlite3_mutex_held(db->mutex) );
  for(i=0; i<db->nDb; i++){
    p = db->aDb[i].pBt;
    if( p ) sqlite3BtreeLeave(p);
  }
}









#ifndef NDEBUG
/*
** Return true if the current thread holds the database connection
** mutex and all required BtShared mutexes.
**
** This routine is used inside assert() statements only.
*/

    Btree *p = db->aDb[i].pBt;
    if( p ){
      p->pBt->db = p->db;
    }
  }
}
#endif /* if SQLITE_THREADSAFE */

#ifndef SQLITE_OMIT_INCRBLOB
/*
** Enter a mutex on a Btree given a cursor owned by that Btree. 
**
** These entry points are used by incremental I/O only. Enter() is required 
** any time OMIT_SHARED_CACHE is not defined, regardless of whether or not 
** the build is threadsafe. Leave() is only required by threadsafe builds.
*/
SQLITE_PRIVATE void sqlite3BtreeEnterCursor(BtCursor *pCur){
  sqlite3BtreeEnter(pCur->pBtree);
}
# if SQLITE_THREADSAFE
SQLITE_PRIVATE void sqlite3BtreeLeaveCursor(BtCursor *pCur){
  sqlite3BtreeLeave(pCur->pBtree);
}
# endif
#endif /* ifndef SQLITE_OMIT_INCRBLOB */

#endif /* ifndef SQLITE_OMIT_SHARED_CACHE */

/************** End of btmutex.c *********************************************/
/************** Begin file btree.c *******************************************/
/*
** 2004 April 6
**

**
** Verify that the cursor holds the mutex on its BtShared
*/
#ifdef SQLITE_DEBUG
static int cursorHoldsMutex(BtCursor *p){
  return sqlite3_mutex_held(p->pBt->mutex);
}
static int cursorOwnsBtShared(BtCursor *p){
  assert( cursorHoldsMutex(p) );
  return (p->pBtree->db==p->pBt->db);
}
#endif

/*
** Invalidate the overflow cache of the cursor passed as the first argument.
** on the shared btree structure pBt.
*/
#define invalidateOverflowCache(pCur) (pCur->curFlags &= ~BTCF_ValidOvfl)

** saved position info stored by saveCursorPosition(), so there can be
** at most one effective restoreCursorPosition() call after each 
** saveCursorPosition().
*/
static int btreeRestoreCursorPosition(BtCursor *pCur){
  int rc;
  int skipNext;
  assert( cursorOwnsBtShared(pCur) );
  assert( pCur->eState>=CURSOR_REQUIRESEEK );
  if( pCur->eState==CURSOR_FAULT ){
    return pCur->skipNext;
  }
  pCur->eState = CURSOR_INVALID;
  rc = btreeMoveto(pCur, pCur->pKey, pCur->nKey, 0, &skipNext);
  if( rc==SQLITE_OK ){

static void btreeParseCellPtrNoPayload(
  MemPage *pPage,         /* Page containing the cell */
  u8 *pCell,              /* Pointer to the cell text. */
  CellInfo *pInfo         /* Fill in this structure */
){
  assert( sqlite3_mutex_held(pPage->pBt->mutex) );
  assert( pPage->leaf==0 );

  assert( pPage->childPtrSize==4 );
#ifndef SQLITE_DEBUG
  UNUSED_PARAMETER(pPage);
#endif
  pInfo->nSize = 4 + getVarint(&pCell[4], (u64*)&pInfo->nKey);
  pInfo->nPayload = 0;
  pInfo->nLocal = 0;

){
  u8 *pIter;              /* For scanning through pCell */
  u32 nPayload;           /* Number of bytes of cell payload */
  u64 iKey;               /* Extracted Key value */

  assert( sqlite3_mutex_held(pPage->pBt->mutex) );
  assert( pPage->leaf==0 || pPage->leaf==1 );


  assert( pPage->intKeyLeaf );
  assert( pPage->childPtrSize==0 );
  pIter = pCell;

  /* The next block of code is equivalent to:
  **
  **     pIter += getVarint32(pIter, nPayload);

){
  u8 *pIter;              /* For scanning through pCell */
  u32 nPayload;           /* Number of bytes of cell payload */

  assert( sqlite3_mutex_held(pPage->pBt->mutex) );
  assert( pPage->leaf==0 || pPage->leaf==1 );
  assert( pPage->intKeyLeaf==0 );

  pIter = pCell + pPage->childPtrSize;
  nPayload = *pIter;
  if( nPayload>=0x80 ){
    u8 *pEnd = &pIter[8];
    nPayload &= 0x7f;
    do{
      nPayload = (nPayload<<7) | (*++pIter & 0x7f);

  ** the (CellInfo.nSize) value found by doing a full parse of the
  ** cell. If SQLITE_DEBUG is defined, an assert() at the bottom of
  ** this function verifies that this invariant is not violated. */
  CellInfo debuginfo;
  pPage->xParseCell(pPage, pCell, &debuginfo);
#endif


  nSize = *pIter;
  if( nSize>=0x80 ){
    pEnd = &pIter[8];
    nSize &= 0x7f;
    do{
      nSize = (nSize<<7) | (*++pIter & 0x7f);
    }while( *(pIter)>=0x80 && pIter<pEnd );

    assert( (PTF_LEAFDATA|PTF_INTKEY)==5 );
    /* EVIDENCE-OF: R-20501-61796 A value of 13 means the page is a leaf
    ** table b-tree page. */
    assert( (PTF_LEAFDATA|PTF_INTKEY|PTF_LEAF)==13 );
    pPage->intKey = 1;
    if( pPage->leaf ){
      pPage->intKeyLeaf = 1;

      pPage->xParseCell = btreeParseCellPtr;
    }else{
      pPage->intKeyLeaf = 0;

      pPage->xCellSize = cellSizePtrNoPayload;
      pPage->xParseCell = btreeParseCellPtrNoPayload;
    }
    pPage->maxLocal = pBt->maxLeaf;
    pPage->minLocal = pBt->minLeaf;
  }else if( flagByte==PTF_ZERODATA ){
    /* EVIDENCE-OF: R-27225-53936 A value of 2 means the page is an interior
    ** index b-tree page. */
    assert( (PTF_ZERODATA)==2 );
    /* EVIDENCE-OF: R-16571-11615 A value of 10 means the page is a leaf
    ** index b-tree page. */
    assert( (PTF_ZERODATA|PTF_LEAF)==10 );
    pPage->intKey = 0;
    pPage->intKeyLeaf = 0;

    pPage->xParseCell = btreeParseCellPtrIndex;
    pPage->maxLocal = pBt->maxLocal;
    pPage->minLocal = pBt->minLocal;
  }else{
    /* EVIDENCE-OF: R-47608-56469 Any other value for the b-tree page type is
    ** an error. */
    return SQLITE_CORRUPT_BKPT;

      MUTEX_LOGIC( sqlite3_mutex *mutexShared; )
      pBt->nRef = 1;
      MUTEX_LOGIC( mutexShared = sqlite3MutexAlloc(SQLITE_MUTEX_STATIC_MASTER);)
      if( SQLITE_THREADSAFE && sqlite3GlobalConfig.bCoreMutex ){
        pBt->mutex = sqlite3MutexAlloc(SQLITE_MUTEX_FAST);
        if( pBt->mutex==0 ){
          rc = SQLITE_NOMEM;

          goto btree_open_out;
        }
      }
      sqlite3_mutex_enter(mutexShared);
      pBt->pNext = GLOBAL(BtShared*,sqlite3SharedCacheList);
      GLOBAL(BtShared*,sqlite3SharedCacheList) = pBt;
      sqlite3_mutex_leave(mutexShared);

** of A's read lock.  A tries to promote to reserved but is blocked by B.
** One or the other of the two processes must give way or there can be
** no progress.  By returning SQLITE_BUSY and not invoking the busy callback
** when A already has a read lock, we encourage A to give up and let B
** proceed.
*/
SQLITE_PRIVATE int sqlite3BtreeBeginTrans(Btree *p, int wrflag){

  BtShared *pBt = p->pBt;
  int rc = SQLITE_OK;

  sqlite3BtreeEnter(p);
  btreeIntegrity(p);

  /* If the btree is already in a write-transaction, or it

  /* Write transactions are not possible on a read-only database */
  if( (pBt->btsFlags & BTS_READ_ONLY)!=0 && wrflag ){
    rc = SQLITE_READONLY;
    goto trans_begun;
  }

#ifndef SQLITE_OMIT_SHARED_CACHE
  {
    sqlite3 *pBlock = 0;
    /* If another database handle has already opened a write transaction 
    ** on this shared-btree structure and a second write transaction is
    ** requested, return SQLITE_LOCKED.
    */
    if( (wrflag && pBt->inTransaction==TRANS_WRITE)
     || (pBt->btsFlags & BTS_PENDING)!=0
    ){
      pBlock = pBt->pWriter->db;
    }else if( wrflag>1 ){
      BtLock *pIter;
      for(pIter=pBt->pLock; pIter; pIter=pIter->pNext){
        if( pIter->pBtree!=p ){
          pBlock = pIter->pBtree->db;
          break;
        }
      }
    }
    if( pBlock ){
      sqlite3ConnectionBlocked(p->db, pBlock);
      rc = SQLITE_LOCKED_SHAREDCACHE;
      goto trans_begun;
    }
  }
#endif

  /* Any read-only or read-write transaction implies a read-lock on 
  ** page 1. So if some other shared-cache client already has a write-lock 
  ** on page 1, the transaction cannot be opened. */
  rc = querySharedCacheTableLock(p, MASTER_ROOT, READ_LOCK);

/*
** Create a new cursor for the BTree whose root is on the page
** iTable. If a read-only cursor is requested, it is assumed that
** the caller already has at least a read-only transaction open
** on the database already. If a write-cursor is requested, then
** the caller is assumed to have an open write transaction.
**
** If the BTREE_WRCSR bit of wrFlag is clear, then the cursor can only
** be used for reading.  If the BTREE_WRCSR bit is set, then the cursor
** can be used for reading or for writing if other conditions for writing
** are also met.  These are the conditions that must be met in order
** for writing to be allowed:
**
** 1:  The cursor must have been opened with wrFlag containing BTREE_WRCSR
**
** 2:  Other database connections that share the same pager cache
**     but which are not in the READ_UNCOMMITTED state may not have
**     cursors open with wrFlag==0 on the same table.  Otherwise
**     the changes made by this write cursor would be visible to
**     the read cursors in the other database connection.
**
** 3:  The database must be writable (not on read-only media)
**
** 4:  There must be an active transaction.
**
** The BTREE_FORDELETE bit of wrFlag may optionally be set if BTREE_WRCSR
** is set.  If FORDELETE is set, that is a hint to the implementation that
** this cursor will only be used to seek to and delete entries of an index
** as part of a larger DELETE statement.  The FORDELETE hint is not used by
** this implementation.  But in a hypothetical alternative storage engine 
** in which index entries are automatically deleted when corresponding table
** rows are deleted, the FORDELETE flag is a hint that all SEEK and DELETE
** operations on this cursor can be no-ops and all READ operations can 
** return a null row (2-bytes: 0x01 0x00).
**
** No checking is done to make sure that page iTable really is the
** root page of a b-tree.  If it is not, then the cursor acquired
** will not work correctly.
**
** It is assumed that the sqlite3BtreeCursorZero() has been called
** on pCur to initialize the memory space prior to invoking this routine.

** that the cursor has Cursor.eState==CURSOR_VALID.
**
** Failure is not possible.  This function always returns SQLITE_OK.
** It might just as well be a procedure (returning void) but we continue
** to return an integer result code for historical reasons.
*/
SQLITE_PRIVATE int sqlite3BtreeDataSize(BtCursor *pCur, u32 *pSize){
  assert( cursorOwnsBtShared(pCur) );
  assert( pCur->eState==CURSOR_VALID );
  assert( pCur->iPage>=0 );
  assert( pCur->iPage<BTCURSOR_MAX_DEPTH );
  assert( pCur->apPage[pCur->iPage]->intKeyLeaf==1 );
  getCellInfo(pCur);
  *pSize = pCur->info.nPayload;
  return SQLITE_OK;

#ifndef SQLITE_OMIT_INCRBLOB
  if ( pCur->eState==CURSOR_INVALID ){
    return SQLITE_ABORT;
  }
#endif

  assert( cursorOwnsBtShared(pCur) );
  rc = restoreCursorPosition(pCur);
  if( rc==SQLITE_OK ){
    assert( pCur->eState==CURSOR_VALID );
    assert( pCur->iPage>=0 && pCur->apPage[pCur->iPage] );
    assert( pCur->aiIdx[pCur->iPage]<pCur->apPage[pCur->iPage]->nCell );
    rc = accessPayload(pCur, offset, amt, pBuf, 0);
  }

  BtCursor *pCur,      /* Cursor pointing to entry to read from */
  u32 *pAmt            /* Write the number of available bytes here */
){
  u32 amt;
  assert( pCur!=0 && pCur->iPage>=0 && pCur->apPage[pCur->iPage]);
  assert( pCur->eState==CURSOR_VALID );
  assert( sqlite3_mutex_held(pCur->pBtree->db->mutex) );
  assert( cursorOwnsBtShared(pCur) );
  assert( pCur->aiIdx[pCur->iPage]<pCur->apPage[pCur->iPage]->nCell );
  assert( pCur->info.nSize>0 );
  assert( pCur->info.pPayload>pCur->apPage[pCur->iPage]->aData || CORRUPT_DB );
  assert( pCur->info.pPayload<pCur->apPage[pCur->iPage]->aDataEnd ||CORRUPT_DB);
  amt = (int)(pCur->apPage[pCur->iPage]->aDataEnd - pCur->info.pPayload);
  if( pCur->info.nLocal<amt ) amt = pCur->info.nLocal;
  *pAmt = amt;

** the new child page does not match the flags field of the parent (i.e.
** if an intkey page appears to be the parent of a non-intkey page, or
** vice-versa).
*/
static int moveToChild(BtCursor *pCur, u32 newPgno){
  BtShared *pBt = pCur->pBt;

  assert( cursorOwnsBtShared(pCur) );
  assert( pCur->eState==CURSOR_VALID );
  assert( pCur->iPage<BTCURSOR_MAX_DEPTH );
  assert( pCur->iPage>=0 );
  if( pCur->iPage>=(BTCURSOR_MAX_DEPTH-1) ){
    return SQLITE_CORRUPT_BKPT;
  }
  pCur->info.nSize = 0;

**
** pCur->idx is set to the cell index that contains the pointer
** to the page we are coming from.  If we are coming from the
** right-most child page then pCur->idx is set to one more than
** the largest cell index.
*/
static void moveToParent(BtCursor *pCur){
  assert( cursorOwnsBtShared(pCur) );
  assert( pCur->eState==CURSOR_VALID );
  assert( pCur->iPage>0 );
  assert( pCur->apPage[pCur->iPage] );
  assertParentIndex(
    pCur->apPage[pCur->iPage-1], 
    pCur->aiIdx[pCur->iPage-1], 
    pCur->apPage[pCur->iPage]->pgno

** structure the flags byte is set to 0x02 or 0x0A, indicating an index
** b-tree).
*/
static int moveToRoot(BtCursor *pCur){
  MemPage *pRoot;
  int rc = SQLITE_OK;

  assert( cursorOwnsBtShared(pCur) );
  assert( CURSOR_INVALID < CURSOR_REQUIRESEEK );
  assert( CURSOR_VALID   < CURSOR_REQUIRESEEK );
  assert( CURSOR_FAULT   > CURSOR_REQUIRESEEK );
  if( pCur->eState>=CURSOR_REQUIRESEEK ){
    if( pCur->eState==CURSOR_FAULT ){
      assert( pCur->skipNext!=SQLITE_OK );
      return pCur->skipNext;

** in ascending order.
*/
static int moveToLeftmost(BtCursor *pCur){
  Pgno pgno;
  int rc = SQLITE_OK;
  MemPage *pPage;

  assert( cursorOwnsBtShared(pCur) );
  assert( pCur->eState==CURSOR_VALID );
  while( rc==SQLITE_OK && !(pPage = pCur->apPage[pCur->iPage])->leaf ){
    assert( pCur->aiIdx[pCur->iPage]<pPage->nCell );
    pgno = get4byte(findCell(pPage, pCur->aiIdx[pCur->iPage]));
    rc = moveToChild(pCur, pgno);
  }
  return rc;

** key in ascending order.
*/
static int moveToRightmost(BtCursor *pCur){
  Pgno pgno;
  int rc = SQLITE_OK;
  MemPage *pPage = 0;

  assert( cursorOwnsBtShared(pCur) );
  assert( pCur->eState==CURSOR_VALID );
  while( !(pPage = pCur->apPage[pCur->iPage])->leaf ){
    pgno = get4byte(&pPage->aData[pPage->hdrOffset+8]);
    pCur->aiIdx[pCur->iPage] = pPage->nCell;
    rc = moveToChild(pCur, pgno);
    if( rc ) return rc;
  }
  pCur->aiIdx[pCur->iPage] = pPage->nCell-1;
  assert( pCur->info.nSize==0 );
  assert( (pCur->curFlags & BTCF_ValidNKey)==0 );
  return SQLITE_OK;
}

/* Move the cursor to the first entry in the table.  Return SQLITE_OK
** on success.  Set *pRes to 0 if the cursor actually points to something
** or set *pRes to 1 if the table is empty.
*/
SQLITE_PRIVATE int sqlite3BtreeFirst(BtCursor *pCur, int *pRes){
  int rc;

  assert( cursorOwnsBtShared(pCur) );
  assert( sqlite3_mutex_held(pCur->pBtree->db->mutex) );
  rc = moveToRoot(pCur);
  if( rc==SQLITE_OK ){
    if( pCur->eState==CURSOR_INVALID ){
      assert( pCur->pgnoRoot==0 || pCur->apPage[pCur->iPage]->nCell==0 );
      *pRes = 1;
    }else{

/* Move the cursor to the last entry in the table.  Return SQLITE_OK
** on success.  Set *pRes to 0 if the cursor actually points to something
** or set *pRes to 1 if the table is empty.
*/
SQLITE_PRIVATE int sqlite3BtreeLast(BtCursor *pCur, int *pRes){
  int rc;
 
  assert( cursorOwnsBtShared(pCur) );
  assert( sqlite3_mutex_held(pCur->pBtree->db->mutex) );

  /* If the cursor already points to the last entry, this is a no-op. */
  if( CURSOR_VALID==pCur->eState && (pCur->curFlags & BTCF_AtLast)!=0 ){
#ifdef SQLITE_DEBUG
    /* This block serves to assert() that the cursor really does point 
    ** to the last entry in the b-tree. */

  i64 intKey,              /* The table key */
  int biasRight,           /* If true, bias the search to the high end */
  int *pRes                /* Write search results here */
){
  int rc;
  RecordCompare xRecordCompare;

  assert( cursorOwnsBtShared(pCur) );
  assert( sqlite3_mutex_held(pCur->pBtree->db->mutex) );
  assert( pRes );
  assert( (pIdxKey==0)==(pCur->pKeyInfo==0) );

  /* If the cursor is already positioned at the point we are trying
  ** to move to, then just return without doing any work */
  if( pCur->eState==CURSOR_VALID && (pCur->curFlags & BTCF_ValidNKey)!=0

** implementation does use this hint, however.)
*/
static SQLITE_NOINLINE int btreeNext(BtCursor *pCur, int *pRes){
  int rc;
  int idx;
  MemPage *pPage;

  assert( cursorOwnsBtShared(pCur) );
  assert( pCur->skipNext==0 || pCur->eState!=CURSOR_VALID );
  assert( *pRes==0 );
  if( pCur->eState!=CURSOR_VALID ){
    assert( (pCur->curFlags & BTCF_ValidOvfl)==0 );
    rc = restoreCursorPosition(pCur);
    if( rc!=SQLITE_OK ){
      return rc;

    return SQLITE_OK;
  }else{
    return moveToLeftmost(pCur);
  }
}
SQLITE_PRIVATE int sqlite3BtreeNext(BtCursor *pCur, int *pRes){
  MemPage *pPage;
  assert( cursorOwnsBtShared(pCur) );
  assert( pRes!=0 );
  assert( *pRes==0 || *pRes==1 );
  assert( pCur->skipNext==0 || pCur->eState!=CURSOR_VALID );
  pCur->info.nSize = 0;
  pCur->curFlags &= ~(BTCF_ValidNKey|BTCF_ValidOvfl);
  *pRes = 0;
  if( pCur->eState!=CURSOR_VALID ) return btreeNext(pCur, pRes);

** SQLite btree implementation does not. (Note that the comdb2 btree
** implementation does use this hint, however.)
*/
static SQLITE_NOINLINE int btreePrevious(BtCursor *pCur, int *pRes){
  int rc;
  MemPage *pPage;

  assert( cursorOwnsBtShared(pCur) );
  assert( pRes!=0 );
  assert( *pRes==0 );
  assert( pCur->skipNext==0 || pCur->eState!=CURSOR_VALID );
  assert( (pCur->curFlags & (BTCF_AtLast|BTCF_ValidOvfl|BTCF_ValidNKey))==0 );
  assert( pCur->info.nSize==0 );
  if( pCur->eState!=CURSOR_VALID ){
    rc = restoreCursorPosition(pCur);

    }else{
      rc = SQLITE_OK;
    }
  }
  return rc;
}
SQLITE_PRIVATE int sqlite3BtreePrevious(BtCursor *pCur, int *pRes){
  assert( cursorOwnsBtShared(pCur) );
  assert( pRes!=0 );
  assert( *pRes==0 || *pRes==1 );
  assert( pCur->skipNext==0 || pCur->eState!=CURSOR_VALID );
  *pRes = 0;
  pCur->curFlags &= ~(BTCF_AtLast|BTCF_ValidOvfl|BTCF_ValidNKey);
  pCur->info.nSize = 0;
  if( pCur->eState!=CURSOR_VALID

  ** Use a call to btreeParseCellPtr() to verify that the values above
  ** were computed correctly.
  */
#if SQLITE_DEBUG
  {
    CellInfo info;
    pPage->xParseCell(pPage, pCell, &info);
    assert( nHeader==(int)(info.pPayload - pCell) );
    assert( info.nKey==nKey );
    assert( *pnSize == info.nSize );
    assert( spaceLeft == info.nLocal );
  }
#endif

  /* Write the payload into the local Cell and any extra into overflow pages */

    ** invariant.
    **
    ** This must be done in advance.  Once the balance starts, the cell
    ** offset section of the btree page will be overwritten and we will no
    ** long be able to find the cells if a pointer to each cell is not saved
    ** first.
    */
    memset(&b.szCell[b.nCell], 0, sizeof(b.szCell[0])*(limit+pOld->nOverflow));
    if( pOld->nOverflow>0 ){

      limit = pOld->aiOvfl[0];
      for(j=0; j<limit; j++){
        b.apCell[b.nCell] = aData + (maskPage & get2byteAligned(piCell));
        piCell += 2;
        b.nCell++;
      }
      for(k=0; k<pOld->nOverflow; k++){

*/
static int balance(BtCursor *pCur){
  int rc = SQLITE_OK;
  const int nMin = pCur->pBt->usableSize * 2 / 3;
  u8 aBalanceQuickSpace[13];
  u8 *pFree = 0;

  VVA_ONLY( int balance_quick_called = 0 );
  VVA_ONLY( int balance_deeper_called = 0 );

  do {
    int iPage = pCur->iPage;
    MemPage *pPage = pCur->apPage[iPage];

    if( iPage==0 ){
      if( pPage->nOverflow ){
        /* The root page of the b-tree is overfull. In this case call the
        ** balance_deeper() function to create a new child for the root-page
        ** and copy the current contents of the root-page to it. The
        ** next iteration of the do-loop will balance the child page.
        */ 
        assert( balance_deeper_called==0 );
        VVA_ONLY( balance_deeper_called++ );
        rc = balance_deeper(pPage, &pCur->apPage[1]);
        if( rc==SQLITE_OK ){
          pCur->iPage = 1;
          pCur->aiIdx[0] = 0;
          pCur->aiIdx[1] = 0;
          assert( pCur->apPage[1]->nOverflow );
        }

          ** buffer. 
          **
          ** The purpose of the following assert() is to check that only a
          ** single call to balance_quick() is made for each call to this
          ** function. If this were not verified, a subtle bug involving reuse
          ** of the aBalanceQuickSpace[] might sneak in.
          */
          assert( balance_quick_called==0 ); 
          VVA_ONLY( balance_quick_called++ );
          rc = balance_quick(pParent, pPage, aBalanceQuickSpace);
        }else
#endif
        {
          /* In this case, call balance_nonroot() to redistribute cells
          ** between pPage and up to 2 of its sibling pages. This involves
          ** modifying the contents of pParent, which may cause pParent to

  unsigned char *newCell = 0;

  if( pCur->eState==CURSOR_FAULT ){
    assert( pCur->skipNext!=SQLITE_OK );
    return pCur->skipNext;
  }

  assert( cursorOwnsBtShared(pCur) );
  assert( (pCur->curFlags & BTCF_WriteFlag)!=0
              && pBt->inTransaction==TRANS_WRITE
              && (pBt->btsFlags & BTS_READ_ONLY)==0 );
  assert( hasSharedCacheTableLock(p, pCur->pgnoRoot, pCur->pKeyInfo!=0, 2) );

  /* Assert that the caller has been consistent. If this cursor was opened
  ** expecting an index b-tree, then the caller should be inserting blob

end_insert:
  return rc;
}

/*
** Delete the entry that the cursor is pointing to. 
**
** If the BTREE_SAVEPOSITION bit of the flags parameter is zero, then
** the cursor is left pointing at an arbitrary location after the delete.
** But if that bit is set, then the cursor is left in a state such that
** the next call to BtreeNext() or BtreePrev() moves it to the same row
** as it would have been on if the call to BtreeDelete() had been omitted.
**
** The BTREE_AUXDELETE bit of flags indicates that is one of several deletes
** associated with a single table entry and its indexes.  Only one of those
** deletes is considered the "primary" delete.  The primary delete occurs
** on a cursor that is not a BTREE_FORDELETE cursor.  All but one delete
** operation on non-FORDELETE cursors is tagged with the AUXDELETE flag.
** The BTREE_AUXDELETE bit is a hint that is not used by this implementation,
** but which might be used by alternative storage engines.
*/
SQLITE_PRIVATE int sqlite3BtreeDelete(BtCursor *pCur, u8 flags){
  Btree *p = pCur->pBtree;
  BtShared *pBt = p->pBt;              
  int rc;                              /* Return code */
  MemPage *pPage;                      /* Page to delete cell from */
  unsigned char *pCell;                /* Pointer to cell to delete */
  int iCellIdx;                        /* Index of cell to delete */
  int iCellDepth;                      /* Depth of node containing pCell */ 
  u16 szCell;                          /* Size of the cell being deleted */
  int bSkipnext = 0;                   /* Leaf cursor in SKIPNEXT state */
  u8 bPreserve = flags & BTREE_SAVEPOSITION;  /* Keep cursor valid */

  assert( cursorOwnsBtShared(pCur) );
  assert( pBt->inTransaction==TRANS_WRITE );
  assert( (pBt->btsFlags & BTS_READ_ONLY)==0 );
  assert( pCur->curFlags & BTCF_WriteFlag );
  assert( hasSharedCacheTableLock(p, pCur->pgnoRoot, pCur->pKeyInfo!=0, 2) );
  assert( !hasReadConflicts(p, pCur->pgnoRoot) );
  assert( pCur->aiIdx[pCur->iPage]<pCur->apPage[pCur->iPage]->nCell );
  assert( pCur->eState==CURSOR_VALID );
  assert( (flags & ~(BTREE_SAVEPOSITION | BTREE_AUXDELETE))==0 );

  iCellDepth = pCur->iPage;
  iCellIdx = pCur->aiIdx[iCellDepth];
  pPage = pCur->apPage[iCellDepth];
  pCell = findCell(pPage, iCellIdx);

  /* If the page containing the entry to delete is not a leaf page, move

    }
    rc = balance(pCur);
  }

  if( rc==SQLITE_OK ){
    if( bSkipnext ){
      assert( bPreserve && (pCur->iPage==iCellDepth || CORRUPT_DB) );
      assert( pPage==pCur->apPage[pCur->iPage] || CORRUPT_DB );
      assert( (pPage->nCell>0 || CORRUPT_DB) && iCellIdx<=pPage->nCell );
      pCur->eState = CURSOR_SKIPNEXT;
      if( iCellIdx>=pPage->nCell ){
        pCur->skipNext = -1;
        pCur->aiIdx[iCellDepth] = pPage->nCell-1;
      }else{
        pCur->skipNext = 1;

  **
  ** This error is caught long before control reaches this point.
  */
  if( NEVER(pBt->pCursor) ){
    sqlite3ConnectionBlocked(p->db, pBt->pCursor->pBtree->db);
    return SQLITE_LOCKED_SHAREDCACHE;
  }

  /*
  ** It is illegal to drop the sqlite_master table on page 1.  But again,
  ** this error is caught long before reaching this point.
  */
  if( NEVER(iTable<2) ){
    return SQLITE_CORRUPT_BKPT;
  }

  rc = btreeGetPage(pBt, (Pgno)iTable, &pPage, 0);
  if( rc ) return rc;
  rc = sqlite3BtreeClearTable(p, iTable, 0);
  if( rc ){
    releasePage(pPage);
    return rc;
  }

  *piMoved = 0;


#ifdef SQLITE_OMIT_AUTOVACUUM
  freePage(pPage, &rc);
  releasePage(pPage);
#else
  if( pBt->autoVacuum ){
    Pgno maxRootPgno;
    sqlite3BtreeGetMeta(p, BTREE_LARGEST_ROOT_PAGE, &maxRootPgno);

    if( iTable==maxRootPgno ){
      /* If the table being dropped is the table with the largest root-page
      ** number in the database, put the root page on the free list. 
      */
      freePage(pPage, &rc);
      releasePage(pPage);
      if( rc!=SQLITE_OK ){
        return rc;
      }
    }else{
      /* The table being dropped does not have the largest root-page
      ** number in the database. So move the page that does into the 
      ** gap left by the deleted root-page.
      */
      MemPage *pMove;
      releasePage(pPage);
      rc = btreeGetPage(pBt, maxRootPgno, &pMove, 0);
      if( rc!=SQLITE_OK ){
        return rc;
      }
      rc = relocatePage(pBt, pMove, PTRMAP_ROOTPAGE, 0, iTable, 0);
      releasePage(pMove);
      if( rc!=SQLITE_OK ){
        return rc;
      }
      pMove = 0;
      rc = btreeGetPage(pBt, maxRootPgno, &pMove, 0);
      freePage(pMove, &rc);
      releasePage(pMove);
      if( rc!=SQLITE_OK ){
        return rc;
      }
      *piMoved = maxRootPgno;
    }

    /* Set the new 'max-root-page' value in the database header. This
    ** is the old value less one, less one more if that happens to
    ** be a root-page number, less one again if that is the
    ** PENDING_BYTE_PAGE.
    */
    maxRootPgno--;
    while( maxRootPgno==PENDING_BYTE_PAGE(pBt)
           || PTRMAP_ISPAGE(pBt, maxRootPgno) ){
      maxRootPgno--;
    }
    assert( maxRootPgno!=PENDING_BYTE_PAGE(pBt) );

    rc = sqlite3BtreeUpdateMeta(p, 4, maxRootPgno);
  }else{
    freePage(pPage, &rc);
    releasePage(pPage);
  }
#endif








  return rc;  
}
SQLITE_PRIVATE int sqlite3BtreeDropTable(Btree *p, int iTable, int *piMoved){
  int rc;
  sqlite3BtreeEnter(p);
  rc = btreeDropTable(p, iTable, piMoved);
  sqlite3BtreeLeave(p);

  pCheck->mxErr--;
  pCheck->nErr++;
  va_start(ap, zFormat);
  if( pCheck->errMsg.nChar ){
    sqlite3StrAccumAppend(&pCheck->errMsg, "\n", 1);
  }
  if( pCheck->zPfx ){
    sqlite3XPrintf(&pCheck->errMsg, pCheck->zPfx, pCheck->v1, pCheck->v2);
  }
  sqlite3VXPrintf(&pCheck->errMsg, zFormat, ap);
  va_end(ap);
  if( pCheck->errMsg.accError==STRACCUM_NOMEM ){
    pCheck->mallocFailed = 1;
  }
}
#endif /* SQLITE_OMIT_INTEGRITY_CHECK */

  BtShared *pBt = p->pBt;
  int savedDbFlags = pBt->db->flags;
  char zErr[100];
  VVA_ONLY( int nRef );

  sqlite3BtreeEnter(p);
  assert( p->inTrans>TRANS_NONE && pBt->inTransaction>TRANS_NONE );
  VVA_ONLY( nRef = sqlite3PagerRefcount(pBt->pPager) );
  assert( nRef>=0 );
  sCheck.pBt = pBt;
  sCheck.pPager = pBt->pPager;
  sCheck.nPage = btreePagecount(sCheck.pBt);
  sCheck.mxErr = mxErr;
  sCheck.nErr = 0;
  sCheck.mallocFailed = 0;
  sCheck.zPfx = 0;
  sCheck.v1 = 0;
  sCheck.v2 = 0;
  sCheck.aPgRef = 0;
  sCheck.heap = 0;
  sqlite3StrAccumInit(&sCheck.errMsg, 0, zErr, sizeof(zErr), SQLITE_MAX_LENGTH);
  sCheck.errMsg.printfFlags = SQLITE_PRINTF_INTERNAL;
  if( sCheck.nPage==0 ){
    goto integrity_ck_cleanup;
  }

  sCheck.aPgRef = sqlite3MallocZero((sCheck.nPage / 8)+ 1);
  if( !sCheck.aPgRef ){
    sCheck.mallocFailed = 1;

** Only the data content may only be modified, it is not possible to 
** change the length of the data stored. If this function is called with
** parameters that attempt to write past the end of the existing data,
** no modifications are made and SQLITE_CORRUPT is returned.
*/
SQLITE_PRIVATE int sqlite3BtreePutData(BtCursor *pCsr, u32 offset, u32 amt, void *z){
  int rc;
  assert( cursorOwnsBtShared(pCsr) );
  assert( sqlite3_mutex_held(pCsr->pBtree->db->mutex) );
  assert( pCsr->curFlags & BTCF_Incrblob );

  rc = restoreCursorPosition(pCsr);
  if( rc!=SQLITE_OK ){
    return rc;
  }

  return (p->pBt->btsFlags & BTS_READ_ONLY)!=0;
}

/*
** Return the size of the header added to each page by this module.
*/
SQLITE_PRIVATE int sqlite3HeaderSizeBtree(void){ return ROUND8(sizeof(MemPage)); }

#if !defined(SQLITE_OMIT_SHARED_CACHE)
/*
** Return true if the Btree passed as the only argument is sharable.
*/
SQLITE_PRIVATE int sqlite3BtreeSharable(Btree *p){
  return p->sharable;
}
#endif

/************** End of btree.c ***********************************************/
/************** Begin file backup.c ******************************************/
/*
** 2009 January 28
**
** The author disclaims copyright to this source code.  In place of

** pMem->z into the new allocation.  pMem must be either a string or
** blob if bPreserve is true.  If bPreserve is false, any prior content
** in pMem->z is discarded.
*/
SQLITE_PRIVATE SQLITE_NOINLINE int sqlite3VdbeMemGrow(Mem *pMem, int n, int bPreserve){
  assert( sqlite3VdbeCheckMemInvariants(pMem) );
  assert( (pMem->flags&MEM_RowSet)==0 );
  testcase( pMem->db==0 );

  /* If the bPreserve flag is set to true, then the memory cell must already
  ** contain a valid string or blob value.  */
  assert( bPreserve==0 || pMem->flags&(MEM_Blob|MEM_Str) );
  testcase( bPreserve && pMem->z==0 );

  assert( pMem->szMalloc==0

** empty boolean index.
*/
SQLITE_PRIVATE void sqlite3VdbeMemSetRowSet(Mem *pMem){
  sqlite3 *db = pMem->db;
  assert( db!=0 );
  assert( (pMem->flags & MEM_RowSet)==0 );
  sqlite3VdbeMemRelease(pMem);
  pMem->zMalloc = sqlite3DbMallocRawNN(db, 64);
  if( db->mallocFailed ){
    pMem->flags = MEM_Null;
    pMem->szMalloc = 0;
  }else{
    assert( pMem->zMalloc );
    pMem->szMalloc = sqlite3DbMallocSize(db, pMem->zMalloc);
    pMem->u.pRowSet = sqlite3RowSetInit(db, pMem->zMalloc, pMem->szMalloc);

    goto value_from_function_out;
  }

  assert( pCtx->pParse->rc==SQLITE_OK );
  memset(&ctx, 0, sizeof(ctx));
  ctx.pOut = pVal;
  ctx.pFunc = pFunc;
  pFunc->xSFunc(&ctx, nVal, apVal);
  if( ctx.isError ){
    rc = ctx.isError;
    sqlite3ErrorMsg(pCtx->pParse, "%s", sqlite3_value_text(pVal));
  }else{
    sqlite3ValueApplyAffinity(pVal, aff, SQLITE_UTF8);
    assert( rc==SQLITE_OK );
    rc = sqlite3VdbeChangeEncoding(pVal, enc);

  }
#endif

  *ppVal = pVal;
  return rc;

no_mem:
  sqlite3OomFault(db);
  sqlite3DbFree(db, zVal);
  assert( *ppVal==0 );
#ifdef SQLITE_ENABLE_STAT3_OR_STAT4
  if( pCtx==0 ) sqlite3ValueFree(pVal);
#else
  assert( pCtx==0 ); sqlite3ValueFree(pVal);
#endif

  UNUSED_PARAMETER( argc );
  iSerial = sqlite3VdbeSerialType(argv[0], file_format, &nVal);
  nSerial = sqlite3VarintLen(iSerial);
  db = sqlite3_context_db_handle(context);

  nRet = 1 + nSerial + nVal;
  aRet = sqlite3DbMallocRawNN(db, nRet);
  if( aRet==0 ){
    sqlite3_result_error_nomem(context);
  }else{
    aRet[0] = nSerial+1;
    putVarint32(&aRet[1], iSerial);
    sqlite3VdbeSerialPut(&aRet[1+nSerial], argv[0], iSerial);
    sqlite3_result_blob(context, aRet, nRet, SQLITE_TRANSIENT);

}
SQLITE_PRIVATE int sqlite3VdbeAddOp3(Vdbe *p, int op, int p1, int p2, int p3){
  int i;
  VdbeOp *pOp;

  i = p->nOp;
  assert( p->magic==VDBE_MAGIC_INIT );
  assert( op>=0 && op<0xff );
  if( p->pParse->nOpAlloc<=i ){
    return growOp3(p, op, p1, p2, p3);
  }
  p->nOp++;
  pOp = &p->aOp[i];
  pOp->opcode = (u8)op;
  pOp->p5 = 0;

  va_list ap;
  int i;
  char c;
  va_start(ap, zTypes);
  for(i=0; (c = zTypes[i])!=0; i++){
    if( c=='s' ){
      const char *z = va_arg(ap, const char*);
      sqlite3VdbeAddOp4(p, z==0 ? OP_Null : OP_String8, 0, iDest++, 0, z, 0);

    }else{
      assert( c=='i' );
      sqlite3VdbeAddOp2(p, OP_Integer, va_arg(ap, int), iDest++);
    }
  }
  va_end(ap);
}

  int op,             /* The new opcode */
  int p1,             /* The P1 operand */
  int p2,             /* The P2 operand */
  int p3,             /* The P3 operand */
  const u8 *zP4,      /* The P4 operand */
  int p4type          /* P4 operand type */
){
  char *p4copy = sqlite3DbMallocRawNN(sqlite3VdbeDb(p), 8);
  if( p4copy ) memcpy(p4copy, zP4, 8);
  return sqlite3VdbeAddOp4(p, op, p1, p2, p3, p4copy, p4type);
}

/*
** Add an OP_ParseSchema opcode.  This routine is broken out from
** sqlite3VdbeAddOp4() since it needs to also needs to mark all btrees
** as having been used.
**
** The zWhere string must have been obtained from sqlite3_malloc().
** This routine will take ownership of the allocated memory.
*/
SQLITE_PRIVATE void sqlite3VdbeAddParseSchemaOp(Vdbe *p, int iDb, char *zWhere){
  int j;
  sqlite3VdbeAddOp4(p, OP_ParseSchema, iDb, 0, 0, zWhere, P4_DYNAMIC);

  for(j=0; j<p->db->nDb; j++) sqlite3VdbeUsesBtree(p, j);
}

/*
** Add an opcode that includes the p4 value as an integer.
*/
SQLITE_PRIVATE int sqlite3VdbeAddOp4Int(
  Vdbe *p,            /* Add the opcode to this VM */
  int op,             /* The new opcode */
  int p1,             /* The P1 operand */
  int p2,             /* The P2 operand */
  int p3,             /* The P3 operand */
  int p4              /* The P4 operand as an integer */
){
  int addr = sqlite3VdbeAddOp3(p, op, p1, p2, p3);
  sqlite3VdbeChangeP4(p, addr, SQLITE_INT_TO_PTR(p4), P4_INT32);
  return addr;
}

/* Insert the end of a co-routine
*/
SQLITE_PRIVATE void sqlite3VdbeEndCoroutine(Vdbe *v, int regYield){
  sqlite3VdbeAddOp1(v, OP_EndCoroutine, regYield);

  /* Clear the temporary register cache, thereby ensuring that each
  ** co-routine has its own independent set of registers, because co-routines
  ** might expect their registers to be preserved across an OP_Yield, and
  ** that could cause problems if two or more co-routines are using the same
  ** temporary register.
  */
  v->pParse->nTempReg = 0;
  v->pParse->nRangeReg = 0;
}

/*
** Create a new symbolic label for an instruction that has yet to be
** coded.  The symbolic label is really just a negative number.  The
** label can be used as the P2 value of an operation.  Later, when
** the label is resolved to a specific address, the VDBE will scan
** through its operation list and change all values of P2 which match

  Parse *pParse = p->pParse;
  int *aLabel = pParse->aLabel;
  p->readOnly = 1;
  p->bIsReader = 0;
  for(pOp=p->aOp, i=p->nOp-1; i>=0; i--, pOp++){
    u8 opcode = pOp->opcode;

    /* NOTE: Be sure to update mkopcodeh.tcl when adding or removing
    ** cases from this switch! */
    switch( opcode ){
      case OP_Transaction: {
        if( pOp->p2!=0 ) p->readOnly = 0;
        /* fall thru */
      }
      case OP_AutoCommit:

** Return the address of the next instruction to be inserted.
*/
SQLITE_PRIVATE int sqlite3VdbeCurrentAddr(Vdbe *p){
  assert( p->magic==VDBE_MAGIC_INIT );
  return p->nOp;
}

/*
** Verify that at least N opcode slots are available in p without
** having to malloc for more space (except when compiled using
** SQLITE_TEST_REALLOC_STRESS).  This interface is used during testing
** to verify that certain calls to sqlite3VdbeAddOpList() can never
** fail due to a OOM fault and hence that the return value from
** sqlite3VdbeAddOpList() will always be non-NULL.
*/
#if defined(SQLITE_DEBUG) && !defined(SQLITE_TEST_REALLOC_STRESS)
SQLITE_PRIVATE void sqlite3VdbeVerifyNoMallocRequired(Vdbe *p, int N){
  assert( p->nOp + N <= p->pParse->nOpAlloc );
}
#endif

/*
** This function returns a pointer to the array of opcodes associated with
** the Vdbe passed as the first argument. It is the callers responsibility
** to arrange for the returned array to be eventually freed using the 
** vdbeFreeOpArray() function.
**
** Before returning, *pnOp is set to the number of entries in the returned

  resolveP2Values(p, pnMaxArg);
  *pnOp = p->nOp;
  p->aOp = 0;
  return aOp;
}

/*
** Add a whole list of operations to the operation stack.  Return a
** pointer to the first operation inserted.
**
** Non-zero P2 arguments to jump instructions are automatically adjusted
** so that the jump target is relative to the first operation inserted.
*/
SQLITE_PRIVATE VdbeOp *sqlite3VdbeAddOpList(
  Vdbe *p,                     /* Add opcodes to the prepared statement */
  int nOp,                     /* Number of opcodes to add */
  VdbeOpList const *aOp,       /* The opcodes to be added */
  int iLineno                  /* Source-file line number of first opcode */
){
  int i;
  VdbeOp *pOut, *pFirst;
  assert( nOp>0 );
  assert( p->magic==VDBE_MAGIC_INIT );
  if( p->nOp + nOp > p->pParse->nOpAlloc && growOpArray(p, nOp) ){
    return 0;
  }

  pFirst = pOut = &p->aOp[p->nOp];
  for(i=0; i<nOp; i++, aOp++, pOut++){
    pOut->opcode = aOp->opcode;
    pOut->p1 = aOp->p1;
    pOut->p2 = aOp->p2;
    assert( aOp->p2>=0 );
    if( (sqlite3OpcodeProperty[aOp->opcode] & OPFLG_JUMP)!=0 && aOp->p2>0 ){
      pOut->p2 += p->nOp;
    }
    pOut->p3 = aOp->p3;
    pOut->p4type = P4_NOTUSED;
    pOut->p4.p = 0;
    pOut->p5 = 0;
#ifdef SQLITE_ENABLE_EXPLAIN_COMMENTS
    pOut->zComment = 0;
#endif
#ifdef SQLITE_VDBE_COVERAGE
    pOut->iSrcLine = iLineno+i;
#else
    (void)iLineno;
#endif
#ifdef SQLITE_DEBUG
    if( p->db->flags & SQLITE_VdbeAddopTrace ){
      sqlite3VdbePrintOp(0, i+p->nOp, &p->aOp[i+p->nOp]);
    }
#endif
  }
  p->nOp += nOp;
  return pFirst;
}

#if defined(SQLITE_ENABLE_STMT_SCANSTATUS)
/*
** Add an entry to the array of counters managed by sqlite3_stmt_scanstatus().
*/
SQLITE_PRIVATE void sqlite3VdbeScanStatus(

SQLITE_PRIVATE void sqlite3VdbeChangeP2(Vdbe *p, u32 addr, int val){
  sqlite3VdbeGetOp(p,addr)->p2 = val;
}
SQLITE_PRIVATE void sqlite3VdbeChangeP3(Vdbe *p, u32 addr, int val){
  sqlite3VdbeGetOp(p,addr)->p3 = val;
}
SQLITE_PRIVATE void sqlite3VdbeChangeP5(Vdbe *p, u8 p5){
  if( !p->db->mallocFailed ) p->aOp[p->nOp-1].p5 = p5;
}

/*
** Change the P2 operand of instruction addr so that it points to
** the address of the next instruction to be coded.
*/
SQLITE_PRIVATE void sqlite3VdbeJumpHere(Vdbe *p, int addr){

** opcodes contained within. If aOp is not NULL it is assumed to contain 
** nOp entries. 
*/
static void vdbeFreeOpArray(sqlite3 *db, Op *aOp, int nOp){
  if( aOp ){
    Op *pOp;
    for(pOp=aOp; pOp<&aOp[nOp]; pOp++){
      if( pOp->p4type ) freeP4(db, pOp->p4type, pOp->p4.p);
#ifdef SQLITE_ENABLE_EXPLAIN_COMMENTS
      sqlite3DbFree(db, pOp->zComment);
#endif     
    }
  }
  sqlite3DbFree(db, aOp);
}

  p->pNext = pVdbe->pProgram;
  pVdbe->pProgram = p;
}

/*
** Change the opcode at addr into OP_Noop
*/
SQLITE_PRIVATE int sqlite3VdbeChangeToNoop(Vdbe *p, int addr){
  VdbeOp *pOp;
  if( p->db->mallocFailed ) return 0;
  assert( addr>=0 && addr<p->nOp );
  pOp = &p->aOp[addr];

  freeP4(p->db, pOp->p4type, pOp->p4.p);
  pOp->p4type = P4_NOTUSED;
  pOp->p4.z = 0;
  pOp->opcode = OP_Noop;

  return 1;
}

/*
** If the last opcode is "op" and it is not a jump destination,
** then remove it.  Return true if and only if an opcode was removed.
*/
SQLITE_PRIVATE int sqlite3VdbeDeletePriorOpcode(Vdbe *p, u8 op){
  if( (p->nOp-1)>(p->pParse->iFixedOp) && p->aOp[p->nOp-1].opcode==op ){
    return sqlite3VdbeChangeToNoop(p, p->nOp-1);

  }else{
    return 0;
  }
}

/*
** Change the value of the P4 operand for a specific instruction.

** 
** Other values of n (P4_STATIC, P4_COLLSEQ etc.) indicate that zP4 points
** to a string or structure that is guaranteed to exist for the lifetime of
** the Vdbe. In these cases we can just copy the pointer.
**
** If addr<0 then change P4 on the most recently inserted instruction.
*/
static void SQLITE_NOINLINE vdbeChangeP4Full(
  Vdbe *p,
  Op *pOp,
  const char *zP4,
  int n
){
  if( pOp->p4type ){
    freeP4(p->db, pOp->p4type, pOp->p4.p);
    pOp->p4type = 0;
    pOp->p4.p = 0;
  }
  if( n<0 ){
    sqlite3VdbeChangeP4(p, (int)(pOp - p->aOp), zP4, n);
  }else{
    if( n==0 ) n = sqlite3Strlen30(zP4);
    pOp->p4.z = sqlite3DbStrNDup(p->db, zP4, n);
    pOp->p4type = P4_DYNAMIC;
  }
}
SQLITE_PRIVATE void sqlite3VdbeChangeP4(Vdbe *p, int addr, const char *zP4, int n){
  Op *pOp;
  sqlite3 *db;
  assert( p!=0 );
  db = p->db;
  assert( p->magic==VDBE_MAGIC_INIT );
  assert( p->aOp!=0 || db->mallocFailed );
  if( db->mallocFailed ){
    if( n!=P4_VTAB ) freeP4(db, n, (void*)*(char**)&zP4);

    return;
  }
  assert( p->nOp>0 );
  assert( addr<p->nOp );
  if( addr<0 ){
    addr = p->nOp - 1;
  }
  pOp = &p->aOp[addr];

  if( n>=0 || pOp->p4type ){
    vdbeChangeP4Full(p, pOp, zP4, n);
    return;

  }
  if( n==P4_INT32 ){
    /* Note: this cast is safe, because the origin data point was an int
    ** that was cast to a (const char *). */
    pOp->p4.i = SQLITE_PTR_TO_INT(zP4);
    pOp->p4type = P4_INT32;
  }else if( zP4!=0 ){


















    assert( n<0 );

    pOp->p4.p = (void*)zP4;
    pOp->p4type = (signed char)n;

    if( n==P4_VTAB ) sqlite3VtabLock((VTable*)zP4);


  }
}

/*
** Set the P4 on the most recently added opcode to the KeyInfo for the
** index given.
*/

#endif /* SQLITE_DEBUG */

#if VDBE_DISPLAY_P4 && defined(SQLITE_ENABLE_CURSOR_HINTS)
/*
** Translate the P4.pExpr value for an OP_CursorHint opcode into text
** that can be displayed in the P4 column of EXPLAIN output.
*/
static void displayP4Expr(StrAccum *p, Expr *pExpr){
  const char *zOp = 0;

  switch( pExpr->op ){
    case TK_STRING:
      sqlite3XPrintf(p, "%Q", pExpr->u.zToken);
      break;
    case TK_INTEGER:
      sqlite3XPrintf(p, "%d", pExpr->u.iValue);
      break;
    case TK_NULL:
      sqlite3XPrintf(p, "NULL");
      break;
    case TK_REGISTER: {
      sqlite3XPrintf(p, "r[%d]", pExpr->iTable);
      break;
    }
    case TK_COLUMN: {
      if( pExpr->iColumn<0 ){
        sqlite3XPrintf(p, "rowid");
      }else{
        sqlite3XPrintf(p, "c%d", (int)pExpr->iColumn);
      }
      break;
    }
    case TK_LT:      zOp = "LT";      break;
    case TK_LE:      zOp = "LE";      break;
    case TK_GT:      zOp = "GT";      break;
    case TK_GE:      zOp = "GE";      break;

    case TK_UPLUS:   zOp = "PLUS";    break;
    case TK_BITNOT:  zOp = "BITNOT";  break;
    case TK_NOT:     zOp = "NOT";     break;
    case TK_ISNULL:  zOp = "ISNULL";  break;
    case TK_NOTNULL: zOp = "NOTNULL"; break;

    default:
      sqlite3XPrintf(p, "%s", "expr");
      break;
  }

  if( zOp ){
    sqlite3XPrintf(p, "%s(", zOp);

    displayP4Expr(p, pExpr->pLeft);
    if( pExpr->pRight ){

      sqlite3StrAccumAppend(p, ",", 1);
      displayP4Expr(p, pExpr->pRight);
    }
    sqlite3StrAccumAppend(p, ")", 1);
  }

}
#endif /* VDBE_DISPLAY_P4 && defined(SQLITE_ENABLE_CURSOR_HINTS) */


#if VDBE_DISPLAY_P4
/*
** Compute a string that describes the P4 parameter for an opcode.
** Use zTemp for any required temporary buffer space.
*/
static char *displayP4(Op *pOp, char *zTemp, int nTemp){
  char *zP4 = zTemp;
  StrAccum x;
  assert( nTemp>=20 );
  sqlite3StrAccumInit(&x, 0, zTemp, nTemp, 0);
  switch( pOp->p4type ){
    case P4_KEYINFO: {
      int j;
      KeyInfo *pKeyInfo = pOp->p4.pKeyInfo;
      assert( pKeyInfo->aSortOrder!=0 );
      sqlite3XPrintf(&x, "k(%d", pKeyInfo->nField);

      for(j=0; j<pKeyInfo->nField; j++){
        CollSeq *pColl = pKeyInfo->aColl[j];
        const char *zColl = pColl ? pColl->zName : "";


        if( strcmp(zColl, "BINARY")==0 ) zColl = "B";








        sqlite3XPrintf(&x, ",%s%s", pKeyInfo->aSortOrder[j] ? "-" : "", zColl);

      }






      sqlite3StrAccumAppend(&x, ")", 1);
      break;
    }
#ifdef SQLITE_ENABLE_CURSOR_HINTS
    case P4_EXPR: {
      displayP4Expr(&x, pOp->p4.pExpr);
      break;
    }
#endif
    case P4_COLLSEQ: {
      CollSeq *pColl = pOp->p4.pColl;
      sqlite3XPrintf(&x, "(%.20s)", pColl->zName);
      break;
    }
    case P4_FUNCDEF: {
      FuncDef *pDef = pOp->p4.pFunc;
      sqlite3XPrintf(&x, "%s(%d)", pDef->zName, pDef->nArg);
      break;
    }
#ifdef SQLITE_DEBUG
    case P4_FUNCCTX: {
      FuncDef *pDef = pOp->p4.pCtx->pFunc;
      sqlite3XPrintf(&x, "%s(%d)", pDef->zName, pDef->nArg);
      break;
    }
#endif
    case P4_INT64: {
      sqlite3XPrintf(&x, "%lld", *pOp->p4.pI64);
      break;
    }
    case P4_INT32: {
      sqlite3XPrintf(&x, "%d", pOp->p4.i);
      break;
    }
    case P4_REAL: {
      sqlite3XPrintf(&x, "%.16g", *pOp->p4.pReal);
      break;
    }
    case P4_MEM: {
      Mem *pMem = pOp->p4.pMem;
      if( pMem->flags & MEM_Str ){
        zP4 = pMem->z;
      }else if( pMem->flags & MEM_Int ){
        sqlite3XPrintf(&x, "%lld", pMem->u.i);
      }else if( pMem->flags & MEM_Real ){
        sqlite3XPrintf(&x, "%.16g", pMem->u.r);
      }else if( pMem->flags & MEM_Null ){
        zP4 = "NULL";
      }else{
        assert( pMem->flags & MEM_Blob );
        zP4 = "(blob)";
      }
      break;
    }
#ifndef SQLITE_OMIT_VIRTUALTABLE
    case P4_VTAB: {
      sqlite3_vtab *pVtab = pOp->p4.pVtab->pVtab;
      sqlite3XPrintf(&x, "vtab:%p", pVtab);
      break;
    }
#endif
    case P4_INTARRAY: {
      int i;
      int *ai = pOp->p4.ai;
      int n = ai[0];   /* The first element of an INTARRAY is always the
                       ** count of the number of elements to follow */
      for(i=1; i<n; i++){
        sqlite3XPrintf(&x, ",%d", ai[i]);
      }
      zTemp[0] = '[';
      sqlite3StrAccumAppend(&x, "]", 1);
      break;
    }
    case P4_SUBPROGRAM: {
      sqlite3XPrintf(&x, "program");
      break;
    }
    case P4_ADVANCE: {
      zTemp[0] = 0;
      break;
    }
    default: {
      zP4 = pOp->p4.z;
      if( zP4==0 ){
        zP4 = zTemp;
        zTemp[0] = 0;
      }
    }
  }
  sqlite3StrAccumFinish(&x);
  assert( zP4!=0 );
  return zP4;
}
#endif /* VDBE_DISPLAY_P4 */

/*
** Declare to the Vdbe that the BTree object at db->aDb[i] is used.

  assert( i<(int)sizeof(p->btreeMask)*8 );
  DbMaskSet(p->btreeMask, i);
  if( i!=1 && sqlite3BtreeSharable(p->db->aDb[i].pBt) ){
    DbMaskSet(p->lockMask, i);
  }
}

#if !defined(SQLITE_OMIT_SHARED_CACHE)
/*
** If SQLite is compiled to support shared-cache mode and to be threadsafe,
** this routine obtains the mutex associated with each BtShared structure
** that may be accessed by the VM passed as an argument. In doing so it also
** sets the BtShared.db member of each of the BtShared structures, ensuring
** that the correct busy-handler callback is invoked if required.
**

/*
** Release an array of N Mem elements
*/
static void releaseMemArray(Mem *p, int N){
  if( p && N ){
    Mem *pEnd = &p[N];
    sqlite3 *db = p->db;

    if( db->pnBytesFreed ){
      do{
        if( p->szMalloc ) sqlite3DbFree(db, p->zMalloc);
      }while( (++p)<pEnd );
      return;
    }
    do{

      }else if( p->szMalloc ){
        sqlite3DbFree(db, p->zMalloc);
        p->szMalloc = 0;
      }

      p->flags = MEM_Undefined;
    }while( (++p)<pEnd );

  }
}

/*
** Delete a VdbeFrame object and its contents. VdbeFrame objects are
** allocated by the OP_Program opcode in sqlite3VdbeExec().
*/

  */
  releaseMemArray(pMem, 8);
  p->pResultSet = 0;

  if( p->rc==SQLITE_NOMEM ){
    /* This happens if a malloc() inside a call to sqlite3_column_text() or
    ** sqlite3_column_text16() failed.  */
    sqlite3OomFault(db);
    return SQLITE_ERROR;
  }

  /* When the number of output rows reaches nRow, that means the
  ** listing has finished and sqlite3_step() should return SQLITE_DONE.
  ** nRow is the sum of the number of rows in the main program, plus
  ** the sum of the number of rows in all trigger subprograms encountered

    }
    z[j] = 0;
    sqlite3IoTrace("SQL %s\n", z);
  }
}
#endif /* !SQLITE_OMIT_TRACE && SQLITE_ENABLE_IOTRACE */

/* An instance of this object describes bulk memory available for use
** by subcomponents of a prepared statement.  Space is allocated out
** of a ReusableSpace object by the allocSpace() routine below.
*/
struct ReusableSpace {
  u8 *pSpace;          /* Available memory */
  int nFree;           /* Bytes of available memory */
  int nNeeded;         /* Total bytes that could not be allocated */
};

/* Try to allocate nByte bytes of 8-byte aligned bulk memory for pBuf
** from the ReusableSpace object.  Return a pointer to the allocated
** memory on success.  If insufficient memory is available in the
** ReusableSpace object, increase the ReusableSpace.nNeeded
** value by the amount needed and return NULL.
**

** If pBuf is not initially NULL, that means that the memory has already
** been allocated by a prior call to this routine, so just return a copy


** of pBuf and leave ReusableSpace unchanged.
**


** This allocator is employed to repurpose unused slots at the end of the

** opcode array of prepared state for other memory needs of the prepared
** statement.



*/
static void *allocSpace(


  struct ReusableSpace *p,  /* Bulk memory available for allocation */
  void *pBuf,               /* Pointer to a prior allocation */

  int nByte                 /* Bytes of memory needed */
){
  assert( EIGHT_BYTE_ALIGNMENT(p->pSpace) );
  if( pBuf==0 ){
    nByte = ROUND8(nByte);
    if( nByte <= p->nFree ){
      p->nFree -= nByte;
      pBuf = &p->pSpace[p->nFree];
    }else{
      p->nNeeded += nByte;
    }
  }
  assert( EIGHT_BYTE_ALIGNMENT(pBuf) );
  return pBuf;
}

/*

  for(i=1; i<p->nMem; i++){
    assert( p->aMem[i].db==p->db );
  }
#endif
  p->pc = -1;
  p->rc = SQLITE_OK;
  p->errorAction = OE_Abort;

  p->nChange = 0;
  p->cacheCtr = 1;
  p->minWriteFileFormat = 255;
  p->iStatement = 0;
  p->nFkConstraint = 0;
#ifdef VDBE_PROFILE
  for(i=0; i<p->nOp; i++){

  sqlite3 *db;                   /* The database connection */
  int nVar;                      /* Number of parameters */
  int nMem;                      /* Number of VM memory registers */
  int nCursor;                   /* Number of cursors required */
  int nArg;                      /* Number of arguments in subprograms */
  int nOnce;                     /* Number of OP_Once instructions */
  int n;                         /* Loop counter */
  struct ReusableSpace x;        /* Reusable bulk memory */



  assert( p!=0 );
  assert( p->nOp>0 );
  assert( pParse!=0 );
  assert( p->magic==VDBE_MAGIC_INIT );
  assert( pParse==p->pParse );
  db = p->db;
  assert( db->mallocFailed==0 );
  nVar = pParse->nVar;
  nMem = pParse->nMem;
  nCursor = pParse->nTab;
  nArg = pParse->nMaxArg;
  nOnce = pParse->nOnce;
  if( nOnce==0 ) nOnce = 1; /* Ensure at least one byte in p->aOnceFlag[] */
  
  /* For each cursor required, also allocate a memory cell. Memory
  ** cells (nMem+1-nCursor)..nMem, inclusive, will never be used by
  ** the vdbe program. Instead they are used to allocate memory for
  ** VdbeCursor/BtCursor structures. The blob of memory associated with 
  ** cursor 0 is stored in memory cell nMem. Memory cell (nMem-1)
  ** stores the blob of memory associated with cursor 1, etc.
  **
  ** See also: allocateCursor().
  */
  nMem += nCursor;

  /* Figure out how much reusable memory is available at the end of the
  ** opcode array.  This extra memory will be reallocated for other elements


  ** of the prepared statement.
  */
  n = ROUND8(sizeof(Op)*p->nOp);              /* Bytes of opcode memory used */
  x.pSpace = &((u8*)p->aOp)[n];               /* Unused opcode memory */
  assert( EIGHT_BYTE_ALIGNMENT(x.pSpace) );
  x.nFree = ROUNDDOWN8(pParse->szOpAlloc - n);  /* Bytes of unused memory */
  assert( x.nFree>=0 );
  if( x.nFree>0 ){
    memset(x.pSpace, 0, x.nFree);
    assert( EIGHT_BYTE_ALIGNMENT(&x.pSpace[x.nFree]) );
  }

  resolveP2Values(p, &nArg);
  p->usesStmtJournal = (u8)(pParse->isMultiWrite && pParse->mayAbort);
  if( pParse->explain && nMem<10 ){
    nMem = 10;
  }
  p->expired = 0;

  /* Memory for registers, parameters, cursor, etc, is allocated in one or two
  ** passes.  On the first pass, we try to reuse unused memory at the 
  ** end of the opcode array.  If we are unable to satisfy all memory
  ** requirements by reusing the opcode array tail, then the second
  ** pass will fill in the remainder using a fresh memory allocation.  
  **
  ** This two-pass approach that reuses as much memory as possible from
  ** the leftover memory at the end of the opcode array.  This can significantly
  ** reduce the amount of memory held by a prepared statement.
  */
  do {
    x.nNeeded = 0;
    p->aMem = allocSpace(&x, p->aMem, nMem*sizeof(Mem));
    p->aVar = allocSpace(&x, p->aVar, nVar*sizeof(Mem));
    p->apArg = allocSpace(&x, p->apArg, nArg*sizeof(Mem*));

    p->apCsr = allocSpace(&x, p->apCsr, nCursor*sizeof(VdbeCursor*));

    p->aOnceFlag = allocSpace(&x, p->aOnceFlag, nOnce);
#ifdef SQLITE_ENABLE_STMT_SCANSTATUS
    p->anExec = allocSpace(&x, p->anExec, p->nOp*sizeof(i64));
#endif
    if( x.nNeeded==0 ) break;
    x.pSpace = p->pFree = sqlite3DbMallocZero(db, x.nNeeded);


    x.nFree = x.nNeeded;
  }while( !db->mallocFailed );

  p->nCursor = nCursor;
  p->nOnceFlag = nOnce;
  if( p->aVar ){
    p->nVar = (ynVar)nVar;
    for(n=0; n<nVar; n++){
      p->aVar[n].flags = MEM_Null;
      p->aVar[n].db = db;
    }
  }

  p->nzVar = pParse->nzVar;
  p->azVar = pParse->azVar;
  pParse->nzVar =  0;
  pParse->azVar = 0;

  if( p->aMem ){
    p->aMem--;                      /* aMem[] goes from 1..nMem */
    p->nMem = nMem;                 /*       not from 0..nMem-1 */
    for(n=1; n<=nMem; n++){
      p->aMem[n].flags = MEM_Undefined;
      p->aMem[n].db = db;
    }

  **     SQLITE_INTERRUPT
  **
  ** Then the internal cache might have been left in an inconsistent
  ** state.  We need to rollback the statement transaction, if there is
  ** one, or the complete transaction if there is no statement transaction.
  */

  if( db->mallocFailed ){
    p->rc = SQLITE_NOMEM;
  }
  if( p->aOnceFlag ) memset(p->aOnceFlag, 0, p->nOnceFlag);
  closeAllCursors(p);
  if( p->magic!=VDBE_MAGIC_RUN ){
    return SQLITE_OK;
  }

    if( p->bIsReader ) db->nVdbeRead--;
    assert( db->nVdbeActive>=db->nVdbeRead );
    assert( db->nVdbeRead>=db->nVdbeWrite );
    assert( db->nVdbeWrite>=0 );
  }
  p->magic = VDBE_MAGIC_HALT;
  checkActiveVdbeCnt(db);
  if( db->mallocFailed ){
    p->rc = SQLITE_NOMEM;
  }

  /* If the auto-commit flag is set to true, then any locks that were held
  ** by connection db have now been released. Call sqlite3ConnectionUnlocked() 
  ** to invoke any required unlock-notify callbacks.
  */

** This function does not clear the VDBE error code or message, just
** copies them to the database handle.
*/
SQLITE_PRIVATE int sqlite3VdbeTransferError(Vdbe *p){
  sqlite3 *db = p->db;
  int rc = p->rc;
  if( p->zErrMsg ){
    db->bBenignMalloc++;
    sqlite3BeginBenignMalloc();
    if( db->pErr==0 ) db->pErr = sqlite3ValueNew(db);
    sqlite3ValueSetStr(db->pErr, -1, p->zErrMsg, SQLITE_UTF8, SQLITE_TRANSIENT);
    sqlite3EndBenignMalloc();
    db->bBenignMalloc--;
    db->errCode = rc;
  }else{
    sqlite3Error(db, rc);
  }
  return rc;
}

  releaseMemArray(p->aColName, p->nResColumn*COLNAME_N);
  for(pSub=p->pProgram; pSub; pSub=pNext){
    pNext = pSub->pNext;
    vdbeFreeOpArray(db, pSub->aOp, pSub->nOp);
    sqlite3DbFree(db, pSub);
  }
  for(i=p->nzVar-1; i>=0; i--) sqlite3DbFree(db, p->azVar[i]);
  sqlite3DbFree(db, p->azVar);
  vdbeFreeOpArray(db, p->aOp, p->nOp);
  sqlite3DbFree(db, p->aColName);
  sqlite3DbFree(db, p->zSql);
  sqlite3DbFree(db, p->pFree);
#ifdef SQLITE_ENABLE_STMT_SCANSTATUS
  for(i=0; i<p->nScan; i++){
    sqlite3DbFree(db, p->aScan[i].zName);

** MoveTo now.  If no move is pending, check to see if the row has been
** deleted out from under the cursor and if it has, mark the row as
** a NULL row.
**
** If the cursor is already pointing to the correct row and that row has
** not been deleted out from under the cursor, then this routine is a no-op.
*/
SQLITE_PRIVATE int sqlite3VdbeCursorMoveto(VdbeCursor **pp, int *piCol){
  VdbeCursor *p = *pp;
  if( p->eCurType==CURTYPE_BTREE ){
    if( p->deferredMoveto ){
      int iMap;
      if( p->aAltMap && (iMap = p->aAltMap[1+*piCol])>0 ){
        *pp = p->pAltCursor;
        *piCol = iMap - 1;
        return SQLITE_OK;
      }
      return handleDeferredMoveto(p);
    }
    if( sqlite3BtreeCursorHasMoved(p->uc.pCursor) ){
      return handleMovedCursor(p);
    }
  }
  return SQLITE_OK;

    sqlite3VdbeMemShallowCopy(&c1, pMem1, MEM_Ephem);
    sqlite3VdbeMemShallowCopy(&c2, pMem2, MEM_Ephem);
    v1 = sqlite3ValueText((sqlite3_value*)&c1, pColl->enc);
    n1 = v1==0 ? 0 : c1.n;
    v2 = sqlite3ValueText((sqlite3_value*)&c2, pColl->enc);
    n2 = v2==0 ? 0 : c2.n;
    rc = pColl->xCmp(pColl->pUser, n1, v1, n2, v2);
    if( (v1==0 || v2==0) && prcErr ) *prcErr = SQLITE_NOMEM;
    sqlite3VdbeMemRelease(&c1);
    sqlite3VdbeMemRelease(&c2);

    return rc;
  }
}

/*
** Compare two blobs.  Return negative, zero, or positive if the first
** is less than, equal to, or greater than the second, respectively.

#ifndef SQLITE_OMIT_VIRTUALTABLE
/*
** Transfer error message text from an sqlite3_vtab.zErrMsg (text stored
** in memory obtained from sqlite3_malloc) into a Vdbe.zErrMsg (text stored
** in memory obtained from sqlite3DbMalloc).
*/
SQLITE_PRIVATE void sqlite3VtabImportErrmsg(Vdbe *p, sqlite3_vtab *pVtab){
  if( pVtab->zErrMsg ){
    sqlite3 *db = p->db;
    sqlite3DbFree(db, p->zErrMsg);
    p->zErrMsg = sqlite3DbStrDup(db, pVtab->zErrMsg);
    sqlite3_free(pVtab->zErrMsg);
    pVtab->zErrMsg = 0;
  }
}
#endif /* SQLITE_OMIT_VIRTUALTABLE */

/************** End of vdbeaux.c *********************************************/
/************** Begin file vdbeapi.c *****************************************/
/*
** 2004 May 26

SQLITE_API int SQLITE_STDCALL sqlite3_value_int(sqlite3_value *pVal){
  return (int)sqlite3VdbeIntValue((Mem*)pVal);
}
SQLITE_API sqlite_int64 SQLITE_STDCALL sqlite3_value_int64(sqlite3_value *pVal){
  return sqlite3VdbeIntValue((Mem*)pVal);
}
SQLITE_API unsigned int SQLITE_STDCALL sqlite3_value_subtype(sqlite3_value *pVal){
  Mem *pMem = (Mem*)pVal;
  return ((pMem->flags & MEM_Subtype) ? pMem->eSubtype : 0);
}
SQLITE_API const unsigned char *SQLITE_STDCALL sqlite3_value_text(sqlite3_value *pVal){
  return (const unsigned char *)sqlite3ValueText(pVal, SQLITE_UTF8);
}
#ifndef SQLITE_OMIT_UTF16
SQLITE_API const void *SQLITE_STDCALL sqlite3_value_text16(sqlite3_value* pVal){
  return sqlite3ValueText(pVal, SQLITE_UTF16NATIVE);

  sqlite3VdbeMemSetInt64(pCtx->pOut, iVal);
}
SQLITE_API void SQLITE_STDCALL sqlite3_result_null(sqlite3_context *pCtx){
  assert( sqlite3_mutex_held(pCtx->pOut->db->mutex) );
  sqlite3VdbeMemSetNull(pCtx->pOut);
}
SQLITE_API void SQLITE_STDCALL sqlite3_result_subtype(sqlite3_context *pCtx, unsigned int eSubtype){
  Mem *pOut = pCtx->pOut;
  assert( sqlite3_mutex_held(pOut->db->mutex) );
  pOut->eSubtype = eSubtype & 0xff;
  pOut->flags |= MEM_Subtype;
}
SQLITE_API void SQLITE_STDCALL sqlite3_result_text(
  sqlite3_context *pCtx, 
  const char *z, 
  int n,
  void (*xDel)(void *)
){

/* An SQLITE_NOMEM error. */
SQLITE_API void SQLITE_STDCALL sqlite3_result_error_nomem(sqlite3_context *pCtx){
  assert( sqlite3_mutex_held(pCtx->pOut->db->mutex) );
  sqlite3VdbeMemSetNull(pCtx->pOut);
  pCtx->isError = SQLITE_NOMEM;
  pCtx->fErrorOrAux = 1;
  sqlite3OomFault(pCtx->pOut->db);
}

/*
** This function is called after a transaction has been committed. It 
** invokes callbacks registered with sqlite3_wal_hook() as required.
*/
static int doWalCallbacks(sqlite3 *db){

/*
** Allocate or return the aggregate context for a user function.  A new
** context is allocated on the first call.  Subsequent calls return the
** same context that was returned on prior calls.
*/
SQLITE_API void *SQLITE_STDCALL sqlite3_aggregate_context(sqlite3_context *p, int nByte){
  assert( p && p->pFunc && p->pFunc->xFinalize );
  assert( sqlite3_mutex_held(p->pOut->db->mutex) );
  testcase( nByte<0 );
  if( (p->pMem->flags & MEM_Agg)==0 ){
    return createAggContext(p, nByte);
  }else{
    return (void*)p->pMem->z;
  }

**
** This function is deprecated.  Do not use it for new code.  It is
** provide only to avoid breaking legacy code.  New aggregate function
** implementations should keep their own counts within their aggregate
** context.
*/
SQLITE_API int SQLITE_STDCALL sqlite3_aggregate_count(sqlite3_context *p){
  assert( p && p->pMem && p->pFunc && p->pFunc->xFinalize );
  return p->pMem->n;
}
#endif

/*
** Return the number of columns in the result set for the statement pStmt.
*/

    sqlite3_mutex_enter(db->mutex);
    assert( db->mallocFailed==0 );
    ret = xFunc(&p->aColName[N]);
     /* A malloc may have failed inside of the xFunc() call. If this
    ** is the case, clear the mallocFailed flag and return NULL.
    */
    if( db->mallocFailed ){
      sqlite3OomClear(db);
      ret = 0;
    }
    sqlite3_mutex_leave(db->mutex);
  }
  return ret;
}

      zRawSql += nToken;
      nextIndex = idx + 1;
      assert( idx>0 && idx<=p->nVar );
      pVar = &p->aVar[idx-1];
      if( pVar->flags & MEM_Null ){
        sqlite3StrAccumAppend(&out, "NULL", 4);
      }else if( pVar->flags & MEM_Int ){
        sqlite3XPrintf(&out, "%lld", pVar->u.i);
      }else if( pVar->flags & MEM_Real ){
        sqlite3XPrintf(&out, "%!.15g", pVar->u.r);
      }else if( pVar->flags & MEM_Str ){
        int nOut;  /* Number of bytes of the string text to include in output */
#ifndef SQLITE_OMIT_UTF16
        u8 enc = ENC(db);
        Mem utf8;
        if( enc!=SQLITE_UTF8 ){
          memset(&utf8, 0, sizeof(utf8));
          utf8.db = db;
          sqlite3VdbeMemSetStr(&utf8, pVar->z, pVar->n, enc, SQLITE_STATIC);
          sqlite3VdbeChangeEncoding(&utf8, SQLITE_UTF8);
          pVar = &utf8;
        }
#endif
        nOut = pVar->n;
#ifdef SQLITE_TRACE_SIZE_LIMIT
        if( nOut>SQLITE_TRACE_SIZE_LIMIT ){
          nOut = SQLITE_TRACE_SIZE_LIMIT;
          while( nOut<pVar->n && (pVar->z[nOut]&0xc0)==0x80 ){ nOut++; }
        }
#endif    
        sqlite3XPrintf(&out, "'%.*q'", nOut, pVar->z);
#ifdef SQLITE_TRACE_SIZE_LIMIT
        if( nOut<pVar->n ){
          sqlite3XPrintf(&out, "/*+%d bytes*/", pVar->n-nOut);
        }
#endif
#ifndef SQLITE_OMIT_UTF16
        if( enc!=SQLITE_UTF8 ) sqlite3VdbeMemRelease(&utf8);
#endif
      }else if( pVar->flags & MEM_Zero ){
        sqlite3XPrintf(&out, "zeroblob(%d)", pVar->u.nZero);
      }else{
        int nOut;  /* Number of bytes of the blob to include in output */
        assert( pVar->flags & MEM_Blob );
        sqlite3StrAccumAppend(&out, "x'", 2);
        nOut = pVar->n;
#ifdef SQLITE_TRACE_SIZE_LIMIT
        if( nOut>SQLITE_TRACE_SIZE_LIMIT ) nOut = SQLITE_TRACE_SIZE_LIMIT;
#endif
        for(i=0; i<nOut; i++){
          sqlite3XPrintf(&out, "%02x", pVar->z[i]&0xff);
        }
        sqlite3StrAccumAppend(&out, "'", 1);
#ifdef SQLITE_TRACE_SIZE_LIMIT
        if( nOut<pVar->n ){
          sqlite3XPrintf(&out, "/*+%d bytes*/", pVar->n-nOut);
        }
#endif
      }
    }
  }
  return sqlite3StrAccumFinish(&out);
}

  }else if( p->flags & MEM_RowSet ){
    printf(" (rowset)");
  }else{
    char zBuf[200];
    sqlite3VdbeMemPrettyPrint(p, zBuf);
    printf(" %s", zBuf);
  }
  if( p->flags & MEM_Subtype ) printf(" subtype=0x%02x", p->eSubtype);
}
static void registerTrace(int iReg, Mem *p){
  printf("REG[%d] = ", iReg);
  memTracePrint(p);
  printf("\n");
}
#endif

  Vdbe *p                    /* The VDBE */
){
  Op *aOp = p->aOp;          /* Copy of p->aOp */
  Op *pOp = aOp;             /* Current operation */
#if defined(SQLITE_DEBUG) || defined(VDBE_PROFILE)
  Op *pOrigOp;               /* Value of pOp at the top of the loop */
#endif
#ifdef SQLITE_DEBUG
  int nExtraDelete = 0;      /* Verifies FORDELETE and AUXDELETE flags */
#endif
  int rc = SQLITE_OK;        /* Value to return */
  sqlite3 *db = p->db;       /* The database */
  u8 resetSchemaOnFault = 0; /* Reset schema after an error if positive */
  u8 encoding = ENC(db);     /* The database encoding */
  int iCompare = 0;          /* Result of last OP_Compare operation */
  unsigned nVmStep = 0;      /* Number of virtual machine steps */
#ifndef SQLITE_OMIT_PROGRESS_CALLBACK

    }
    if( p->db->flags & SQLITE_VdbeTrace )  printf("VDBE Trace:\n");
  }
  sqlite3EndBenignMalloc();
#endif
  for(pOp=&aOp[p->pc]; rc==SQLITE_OK; pOp++){
    assert( pOp>=aOp && pOp<&aOp[p->nOp]);

#ifdef VDBE_PROFILE
    start = sqlite3Hwtime();
#endif
    nVmStep++;
#ifdef SQLITE_ENABLE_STMT_SCANSTATUS
    if( p->anExec ) p->anExec[(int)(pOp-aOp)]++;
#endif

  sqlite3_context *pCtx;

  assert( pOp->p4type==P4_FUNCDEF );
  n = pOp->p5;
  assert( pOp->p3>0 && pOp->p3<=(p->nMem-p->nCursor) );
  assert( n==0 || (pOp->p2>0 && pOp->p2+n<=(p->nMem-p->nCursor)+1) );
  assert( pOp->p3<pOp->p2 || pOp->p3>=pOp->p2+n );
  pCtx = sqlite3DbMallocRawNN(db, sizeof(*pCtx) + (n-1)*sizeof(sqlite3_value*));
  if( pCtx==0 ) goto no_mem;
  pCtx->pOut = 0;
  pCtx->pFunc = pOp->p4.pFunc;
  pCtx->iOp = (int)(pOp - aOp);
  pCtx->pVdbe = p;
  pCtx->argc = n;
  pOp->p4type = P4_FUNCCTX;

    assert( memIsValid(pCtx->argv[i]) );
    REGISTER_TRACE(pOp->p2+i, pCtx->argv[i]);
  }
#endif
  MemSetTypeFlag(pCtx->pOut, MEM_Null);
  pCtx->fErrorOrAux = 0;
  db->lastRowid = lastRowid;
  (*pCtx->pFunc->xSFunc)(pCtx, pCtx->argc, pCtx->argv);/* IMP: R-24505-23230 */
  lastRowid = db->lastRowid;  /* Remember rowid changes made by xSFunc */

  /* If the function returned an error, throw an exception */
  if( pCtx->fErrorOrAux ){
    if( pCtx->isError ){
      sqlite3VdbeError(p, "%s", sqlite3_value_text(pCtx->pOut));
      rc = pCtx->isError;
    }

**
** Set the permutation used by the OP_Compare operator to be the array
** of integers in P4.
**
** The permutation is only valid until the next OP_Compare that has
** the OPFLAG_PERMUTE bit set in P5. Typically the OP_Permutation should 
** occur immediately prior to the OP_Compare.
**
** The first integer in the P4 integer array is the length of the array
** and does not become part of the permutation.
*/
case OP_Permutation: {
  assert( pOp->p4type==P4_INTARRAY );
  assert( pOp->p4.ai );
  aPermute = pOp->p4.ai + 1;
  break;
}

/* Opcode: Compare P1 P2 P3 P4 P5
** Synopsis: r[P1@P3] <-> r[P2@P3]
**
** Compare two vectors of registers in reg(P1)..reg(P1+P3-1) (call this

  const u8 *zData;   /* Part of the record being decoded */
  const u8 *zHdr;    /* Next unparsed byte of the header */
  const u8 *zEndHdr; /* Pointer to first byte after the header */
  u32 offset;        /* Offset into the data */
  u64 offset64;      /* 64-bit offset */
  u32 avail;         /* Number of bytes of available data */
  u32 t;             /* A type code from the record header */

  Mem *pReg;         /* PseudoTable input register */

  pC = p->apCsr[pOp->p1];
  p2 = pOp->p2;

  /* If the cursor cache is stale, bring it up-to-date */
  rc = sqlite3VdbeCursorMoveto(&pC, &p2);

  assert( pOp->p3>0 && pOp->p3<=(p->nMem-p->nCursor) );
  pDest = &aMem[pOp->p3];
  memAboutToChange(p, pDest);
  assert( pOp->p1>=0 && pOp->p1<p->nCursor );

  assert( pC!=0 );
  assert( p2<pC->nField );
  aOffset = pC->aOffset;
  assert( pC->eCurType!=CURTYPE_VTAB );
  assert( pC->eCurType!=CURTYPE_PSEUDO || pC->nullRow );
  assert( pC->eCurType!=CURTYPE_SORTER );
  pCrsr = pC->uc.pCursor;



  if( rc ) goto abort_due_to_error;
  if( pC->cacheStatus!=p->cacheCtr ){
    if( pC->nullRow ){
      if( pC->eCurType==CURTYPE_PSEUDO ){
        assert( pC->uc.pseudoTableReg>0 );
        pReg = &aMem[pC->uc.pseudoTableReg];
        assert( pReg->flags & MEM_Blob );

  ** all valid.
  */
  assert( p2<pC->nHdrParsed );
  assert( rc==SQLITE_OK );
  assert( sqlite3VdbeCheckMemInvariants(pDest) );
  if( VdbeMemDynamic(pDest) ) sqlite3VdbeMemSetNull(pDest);
  assert( t==pC->aType[p2] );
  pDest->enc = encoding;
  if( pC->szRow>=aOffset[p2+1] ){
    /* This is the common case where the desired content fits on the original
    ** page - where the content is not on an overflow page */
    zData = pC->aRow + aOffset[p2];
    if( t<12 ){
      sqlite3VdbeSerialGet(zData, t, pDest);
    }else{
      /* If the column value is a string, we need a persistent value, not
      ** a MEM_Ephem value.  This branch is a fast short-cut that is equivalent
      ** to calling sqlite3VdbeSerialGet() and sqlite3VdbeDeephemeralize().
      */
      static const u16 aFlag[] = { MEM_Blob, MEM_Str|MEM_Term };
      pDest->n = len = (t-12)/2;
      if( pDest->szMalloc < len+2 ){
        pDest->flags = MEM_Null;
        if( sqlite3VdbeMemGrow(pDest, len+2, 0) ) goto no_mem;
      }else{
        pDest->z = pDest->zMalloc;
      }
      memcpy(pDest->z, zData, len);
      pDest->z[len] = 0;
      pDest->z[len+1] = 0;
      pDest->flags = aFlag[t&1];
    }
  }else{
    /* This branch happens only when content is on overflow pages */
    if( ((pOp->p5 & (OPFLAG_LENGTHARG|OPFLAG_TYPEOFARG))!=0
          && ((t>=12 && (t&1)==0) || (pOp->p5 & OPFLAG_TYPEOFARG)!=0))
     || (len = sqlite3VdbeSerialTypeLen(t))==0
    ){
      /* Content is irrelevant for
      **    1. the typeof() function,
      **    2. the length(X) function if X is a blob, and
      **    3. if the content length is zero.
      ** So we might as well use bogus content rather than reading
      ** content from disk. */
      static u8 aZero[8];  /* This is the bogus content */

      sqlite3VdbeSerialGet(aZero, t, pDest);
    }else{
      rc = sqlite3VdbeMemFromBtree(pCrsr, aOffset[p2], len, !pC->isTable,
                                   pDest);
      if( rc==SQLITE_OK ){


        sqlite3VdbeSerialGet((const u8*)pDest->z, t, pDest);
        pDest->flags &= ~MEM_Ephem;
      }
    }

  }
















op_column_out:
op_column_error:
  UPDATE_MAX_BLOBSIZE(pDest);
  REGISTER_TRACE(pOp->p3, pDest);
  break;
}

/* Opcode: Affinity P1 P2 * P4 *

      assert( db->autoCommit==0 || db->nVTrans==0 );
      rc = sqlite3VtabSavepoint(db, SAVEPOINT_BEGIN,
                                db->nStatement+db->nSavepoint);
      if( rc!=SQLITE_OK ) goto abort_due_to_error;
#endif

      /* Create a new savepoint structure. */
      pNew = sqlite3DbMallocRawNN(db, sizeof(Savepoint)+nName+1);
      if( pNew ){
        pNew->zName = (char *)&pNew[1];
        memcpy(pNew->zName, zName, nName+1);
    
        /* If there is no open transaction, then mark this as a special
        ** "transaction savepoint". */
        if( db->autoCommit ){

** there are active writing VMs or active VMs that use shared cache.
**
** This instruction causes the VM to halt.
*/
case OP_AutoCommit: {
  int desiredAutoCommit;
  int iRollback;


  desiredAutoCommit = pOp->p1;
  iRollback = pOp->p2;

  assert( desiredAutoCommit==1 || desiredAutoCommit==0 );
  assert( desiredAutoCommit==1 || iRollback==0 );
  assert( db->nVdbeActive>0 );  /* At least this one VM is active */
  assert( p->bIsReader );








  if( desiredAutoCommit!=db->autoCommit ){
    if( iRollback ){
      assert( desiredAutoCommit==1 );
      sqlite3RollbackAll(db, SQLITE_ABORT_ROLLBACK);
      db->autoCommit = 1;
    }else if( desiredAutoCommit && db->nVdbeWrite>0 ){
      /* If this instruction implements a COMMIT and other VMs are writing
      ** return an error indicating that the other VMs must complete first. 
      */
      sqlite3VdbeError(p, "cannot commit transaction - "
                          "SQL statements in progress");
      rc = SQLITE_BUSY;
      break;
    }else if( (rc = sqlite3VdbeCheckFk(p, 1))!=SQLITE_OK ){
      goto vdbe_return;
    }else{
      db->autoCommit = (u8)desiredAutoCommit;
    }
    if( sqlite3VdbeHalt(p)==SQLITE_BUSY ){
      p->pc = (int)(pOp - aOp);