/ Check-in [6c3839ef]
Login

Many hyperlinks are disabled.
Use anonymous login to enable hyperlinks.

Overview
Comment:Add the "vtshim" extension, implementing a wrapper around the virtual table interface to make it Disposable for the CLR. No changes to the core.
Downloads: Tarball | ZIP archive | SQL archive
Timelines: family | ancestors | descendants | both | trunk
Files: files | file ages | folders
SHA1:6c3839ef311a53076650c6479c932e545a26b96f
User & Date: drh 2013-06-26 18:04:19
Context
2013-06-26
22:46
Update the ".import" command of the command-line shell so that it can accept field values that span multiple lines and so that it issues error messages if the input text does not strictly conform to RFC4180. check-in: 93f63215 user: drh tags: trunk
18:04
Add the "vtshim" extension, implementing a wrapper around the virtual table interface to make it Disposable for the CLR. No changes to the core. check-in: 6c3839ef user: drh tags: trunk
16:30
Update the boundary3.tcl script so that it can be run with tcl 8.5 or 8.6 to regenerate boundary3.test. check-in: ebac5afa user: dan tags: trunk
2013-06-21
19:39
Enhance error message handling for the vtshim module. Closed-Leaf check-in: b4a0d532 user: mistachkin tags: disposable-vtable
Changes
Hide Diffs Unified Diffs Ignore Whitespace Patch

Added ext/misc/vtshim.c.







































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
/*
** 2013-06-12
**
** The author disclaims copyright to this source code.  In place of
** a legal notice, here is a blessing:
**
**    May you do good and not evil.
**    May you find forgiveness for yourself and forgive others.
**    May you share freely, never taking more than you give.
**
*************************************************************************
**
** A shim that sits between the SQLite virtual table interface and
** runtimes with garbage collector based memory management.
*/
#include "sqlite3ext.h"
SQLITE_EXTENSION_INIT1
#include <assert.h>
#include <string.h>

#ifndef SQLITE_OMIT_VIRTUALTABLE

/* Forward references */
typedef struct vtshim_aux vtshim_aux;
typedef struct vtshim_vtab vtshim_vtab;
typedef struct vtshim_cursor vtshim_cursor;


/* The vtshim_aux argument is the auxiliary parameter that is passed
** into sqlite3_create_module_v2().
*/
struct vtshim_aux {
  void *pChildAux;              /* pAux for child virtual tables */
  void (*xChildDestroy)(void*); /* Destructor for pChildAux */
  sqlite3_module *pMod;         /* Methods for child virtual tables */
  sqlite3 *db;                  /* The database to which we are attached */
  char *zName;                  /* Name of the module */
  int bDisposed;                /* True if disposed */
  vtshim_vtab *pAllVtab;        /* List of all vtshim_vtab objects */
  sqlite3_module sSelf;         /* Methods used by this shim */
};

/* A vtshim virtual table object */
struct vtshim_vtab {
  sqlite3_vtab base;       /* Base class - must be first */
  sqlite3_vtab *pChild;    /* Child virtual table */
  vtshim_aux *pAux;        /* Pointer to vtshim_aux object */
  vtshim_cursor *pAllCur;  /* List of all cursors */
  vtshim_vtab **ppPrev;    /* Previous on list */
  vtshim_vtab *pNext;      /* Next on list */
};

/* A vtshim cursor object */
struct vtshim_cursor {
  sqlite3_vtab_cursor base;    /* Base class - must be first */
  sqlite3_vtab_cursor *pChild; /* Cursor generated by the managed subclass */
  vtshim_cursor **ppPrev;      /* Previous on list of all cursors */
  vtshim_cursor *pNext;        /* Next on list of all cursors */
};

/* Macro used to copy the child vtable error message to outer vtable */
#define VTSHIM_COPY_ERRMSG()                                             \
  do {                                                                   \
    sqlite3_free(pVtab->base.zErrMsg);                                   \
    pVtab->base.zErrMsg = sqlite3_mprintf("%s", pVtab->pChild->zErrMsg); \
  } while (0)

/* Methods for the vtshim module */
static int vtshimCreate(
  sqlite3 *db,
  void *ppAux,
  int argc,
  const char *const*argv,
  sqlite3_vtab **ppVtab,
  char **pzErr
){
  vtshim_aux *pAux = (vtshim_aux*)ppAux;
  vtshim_vtab *pNew;
  int rc;

  assert( db==pAux->db );
  if( pAux->bDisposed ){
    if( pzErr ){
      *pzErr = sqlite3_mprintf("virtual table was disposed: \"%s\"",
                               pAux->zName);
    }
    return SQLITE_ERROR;
  }
  pNew = sqlite3_malloc( sizeof(*pNew) );
  *ppVtab = (sqlite3_vtab*)pNew;
  if( pNew==0 ) return SQLITE_NOMEM;
  memset(pNew, 0, sizeof(*pNew));
  rc = pAux->pMod->xCreate(db, pAux->pChildAux, argc, argv,
                           &pNew->pChild, pzErr);
  if( rc ){
    sqlite3_free(pNew);
    *ppVtab = 0;
  }
  pNew->pAux = pAux;
  pNew->ppPrev = &pAux->pAllVtab;
  pNew->pNext = pAux->pAllVtab;
  if( pAux->pAllVtab ) pAux->pAllVtab->ppPrev = &pNew->pNext;
  pAux->pAllVtab = pNew;
  return rc;
}

static int vtshimConnect(
  sqlite3 *db,
  void *ppAux,
  int argc,
  const char *const*argv,
  sqlite3_vtab **ppVtab,
  char **pzErr
){
  vtshim_aux *pAux = (vtshim_aux*)ppAux;
  vtshim_vtab *pNew;
  int rc;

  assert( db==pAux->db );
  if( pAux->bDisposed ){
    if( pzErr ){
      *pzErr = sqlite3_mprintf("virtual table was disposed: \"%s\"",
                               pAux->zName);
    }
    return SQLITE_ERROR;
  }
  pNew = sqlite3_malloc( sizeof(*pNew) );
  *ppVtab = (sqlite3_vtab*)pNew;
  if( pNew==0 ) return SQLITE_NOMEM;
  memset(pNew, 0, sizeof(*pNew));
  rc = pAux->pMod->xConnect(db, pAux->pChildAux, argc, argv,
                            &pNew->pChild, pzErr);
  if( rc ){
    sqlite3_free(pNew);
    *ppVtab = 0;
  }
  pNew->pAux = pAux;
  pNew->ppPrev = &pAux->pAllVtab;
  pNew->pNext = pAux->pAllVtab;
  if( pAux->pAllVtab ) pAux->pAllVtab->ppPrev = &pNew->pNext;
  pAux->pAllVtab = pNew;
  return rc;
}

static int vtshimBestIndex(
  sqlite3_vtab *pBase,
  sqlite3_index_info *pIdxInfo
){
  vtshim_vtab *pVtab = (vtshim_vtab*)pBase;
  vtshim_aux *pAux = pVtab->pAux;
  int rc;
  if( pAux->bDisposed ) return SQLITE_ERROR;
  rc = pAux->pMod->xBestIndex(pVtab->pChild, pIdxInfo);
  if( rc!=SQLITE_OK ){
    VTSHIM_COPY_ERRMSG();
  }
  return rc;
}

static int vtshimDisconnect(sqlite3_vtab *pBase){
  vtshim_vtab *pVtab = (vtshim_vtab*)pBase;
  vtshim_aux *pAux = pVtab->pAux;
  int rc = SQLITE_OK;
  if( !pAux->bDisposed ){
    rc = pAux->pMod->xDisconnect(pVtab->pChild);
  }
  if( pVtab->pNext ) pVtab->pNext->ppPrev = pVtab->ppPrev;
  *pVtab->ppPrev = pVtab->pNext;
  sqlite3_free(pVtab);
  return rc;
}

static int vtshimDestroy(sqlite3_vtab *pBase){
  vtshim_vtab *pVtab = (vtshim_vtab*)pBase;
  vtshim_aux *pAux = pVtab->pAux;
  int rc = SQLITE_OK;
  if( !pAux->bDisposed ){
    rc = pAux->pMod->xDestroy(pVtab->pChild);
  }
  if( pVtab->pNext ) pVtab->pNext->ppPrev = pVtab->ppPrev;
  *pVtab->ppPrev = pVtab->pNext;
  sqlite3_free(pVtab);
  return rc;
}

static int vtshimOpen(sqlite3_vtab *pBase, sqlite3_vtab_cursor **ppCursor){
  vtshim_vtab *pVtab = (vtshim_vtab*)pBase;
  vtshim_aux *pAux = pVtab->pAux;
  vtshim_cursor *pCur;
  int rc;
  *ppCursor = 0;
  if( pAux->bDisposed ) return SQLITE_ERROR;
  pCur = sqlite3_malloc( sizeof(*pCur) );
  if( pCur==0 ) return SQLITE_NOMEM;
  memset(pCur, 0, sizeof(*pCur));
  rc = pAux->pMod->xOpen(pVtab->pChild, &pCur->pChild);
  if( rc ){
    sqlite3_free(pCur);
    VTSHIM_COPY_ERRMSG();
    return rc;
  }
  pCur->pChild->pVtab = pVtab->pChild;
  *ppCursor = &pCur->base;
  pCur->ppPrev = &pVtab->pAllCur;
  if( pVtab->pAllCur ) pVtab->pAllCur->ppPrev = &pCur->pNext;
  pCur->pNext = pVtab->pAllCur;
  pVtab->pAllCur = pCur;
  return SQLITE_OK;
}

static int vtshimClose(sqlite3_vtab_cursor *pX){
  vtshim_cursor *pCur = (vtshim_cursor*)pX;
  vtshim_vtab *pVtab = (vtshim_vtab*)pCur->base.pVtab;
  vtshim_aux *pAux = pVtab->pAux;
  int rc = SQLITE_OK;
  if( !pAux->bDisposed ){
    rc = pAux->pMod->xClose(pCur->pChild);
    if( rc!=SQLITE_OK ){
      VTSHIM_COPY_ERRMSG();
    }
  }
  if( pCur->pNext ) pCur->pNext->ppPrev = pCur->ppPrev;
  *pCur->ppPrev = pCur->pNext;
  sqlite3_free(pCur);
  return rc;
}

static int vtshimFilter(
  sqlite3_vtab_cursor *pX,
  int idxNum,
  const char *idxStr,
  int argc,
  sqlite3_value **argv
){
  vtshim_cursor *pCur = (vtshim_cursor*)pX;
  vtshim_vtab *pVtab = (vtshim_vtab*)pCur->base.pVtab;
  vtshim_aux *pAux = pVtab->pAux;
  int rc;
  if( pAux->bDisposed ) return SQLITE_ERROR;
  rc = pAux->pMod->xFilter(pCur->pChild, idxNum, idxStr, argc, argv);
  if( rc!=SQLITE_OK ){
    VTSHIM_COPY_ERRMSG();
  }
  return rc;
}

static int vtshimNext(sqlite3_vtab_cursor *pX){
  vtshim_cursor *pCur = (vtshim_cursor*)pX;
  vtshim_vtab *pVtab = (vtshim_vtab*)pCur->base.pVtab;
  vtshim_aux *pAux = pVtab->pAux;
  int rc;
  if( pAux->bDisposed ) return SQLITE_ERROR;
  rc = pAux->pMod->xNext(pCur->pChild);
  if( rc!=SQLITE_OK ){
    VTSHIM_COPY_ERRMSG();
  }
  return rc;
}

static int vtshimEof(sqlite3_vtab_cursor *pX){
  vtshim_cursor *pCur = (vtshim_cursor*)pX;
  vtshim_vtab *pVtab = (vtshim_vtab*)pCur->base.pVtab;
  vtshim_aux *pAux = pVtab->pAux;
  int rc;
  if( pAux->bDisposed ) return 1;
  rc = pAux->pMod->xEof(pCur->pChild);
  VTSHIM_COPY_ERRMSG();
  return rc;
}

static int vtshimColumn(sqlite3_vtab_cursor *pX, sqlite3_context *ctx, int i){
  vtshim_cursor *pCur = (vtshim_cursor*)pX;
  vtshim_vtab *pVtab = (vtshim_vtab*)pCur->base.pVtab;
  vtshim_aux *pAux = pVtab->pAux;
  int rc;
  if( pAux->bDisposed ) return SQLITE_ERROR;
  rc = pAux->pMod->xColumn(pCur->pChild, ctx, i);
  if( rc!=SQLITE_OK ){
    VTSHIM_COPY_ERRMSG();
  }
  return rc;
}

static int vtshimRowid(sqlite3_vtab_cursor *pX, sqlite3_int64 *pRowid){
  vtshim_cursor *pCur = (vtshim_cursor*)pX;
  vtshim_vtab *pVtab = (vtshim_vtab*)pCur->base.pVtab;
  vtshim_aux *pAux = pVtab->pAux;
  int rc;
  if( pAux->bDisposed ) return SQLITE_ERROR;
  rc = pAux->pMod->xRowid(pCur->pChild, pRowid);
  if( rc!=SQLITE_OK ){
    VTSHIM_COPY_ERRMSG();
  }
  return rc;
}

static int vtshimUpdate(
  sqlite3_vtab *pBase,
  int argc,
  sqlite3_value **argv,
  sqlite3_int64 *pRowid
){
  vtshim_vtab *pVtab = (vtshim_vtab*)pBase;
  vtshim_aux *pAux = pVtab->pAux;
  int rc;
  if( pAux->bDisposed ) return SQLITE_ERROR;
  rc = pAux->pMod->xUpdate(pVtab->pChild, argc, argv, pRowid);
  if( rc!=SQLITE_OK ){
    VTSHIM_COPY_ERRMSG();
  }
  return rc;
}

static int vtshimBegin(sqlite3_vtab *pBase){
  vtshim_vtab *pVtab = (vtshim_vtab*)pBase;
  vtshim_aux *pAux = pVtab->pAux;
  int rc;
  if( pAux->bDisposed ) return SQLITE_ERROR;
  rc = pAux->pMod->xBegin(pVtab->pChild);
  if( rc!=SQLITE_OK ){
    VTSHIM_COPY_ERRMSG();
  }
  return rc;
}

static int vtshimSync(sqlite3_vtab *pBase){
  vtshim_vtab *pVtab = (vtshim_vtab*)pBase;
  vtshim_aux *pAux = pVtab->pAux;
  int rc;
  if( pAux->bDisposed ) return SQLITE_ERROR;
  rc = pAux->pMod->xSync(pVtab->pChild);
  if( rc!=SQLITE_OK ){
    VTSHIM_COPY_ERRMSG();
  }
  return rc;
}

static int vtshimCommit(sqlite3_vtab *pBase){
  vtshim_vtab *pVtab = (vtshim_vtab*)pBase;
  vtshim_aux *pAux = pVtab->pAux;
  int rc;
  if( pAux->bDisposed ) return SQLITE_ERROR;
  rc = pAux->pMod->xCommit(pVtab->pChild);
  if( rc!=SQLITE_OK ){
    VTSHIM_COPY_ERRMSG();
  }
  return rc;
}

static int vtshimRollback(sqlite3_vtab *pBase){
  vtshim_vtab *pVtab = (vtshim_vtab*)pBase;
  vtshim_aux *pAux = pVtab->pAux;
  int rc;
  if( pAux->bDisposed ) return SQLITE_ERROR;
  rc = pAux->pMod->xRollback(pVtab->pChild);
  if( rc!=SQLITE_OK ){
    VTSHIM_COPY_ERRMSG();
  }
  return rc;
}

static int vtshimFindFunction(
  sqlite3_vtab *pBase,
  int nArg,
  const char *zName,
  void (**pxFunc)(sqlite3_context*,int,sqlite3_value**),
  void **ppArg
){
  vtshim_vtab *pVtab = (vtshim_vtab*)pBase;
  vtshim_aux *pAux = pVtab->pAux;
  int rc;
  if( pAux->bDisposed ) return 0;
  rc = pAux->pMod->xFindFunction(pVtab->pChild, nArg, zName, pxFunc, ppArg);
  VTSHIM_COPY_ERRMSG();
  return rc;
}

static int vtshimRename(sqlite3_vtab *pBase, const char *zNewName){
  vtshim_vtab *pVtab = (vtshim_vtab*)pBase;
  vtshim_aux *pAux = pVtab->pAux;
  int rc;
  if( pAux->bDisposed ) return SQLITE_ERROR;
  rc = pAux->pMod->xRename(pVtab->pChild, zNewName);
  if( rc!=SQLITE_OK ){
    VTSHIM_COPY_ERRMSG();
  }
  return rc;
}

static int vtshimSavepoint(sqlite3_vtab *pBase, int n){
  vtshim_vtab *pVtab = (vtshim_vtab*)pBase;
  vtshim_aux *pAux = pVtab->pAux;
  int rc;
  if( pAux->bDisposed ) return SQLITE_ERROR;
  rc = pAux->pMod->xSavepoint(pVtab->pChild, n);
  if( rc!=SQLITE_OK ){
    VTSHIM_COPY_ERRMSG();
  }
  return rc;
}

static int vtshimRelease(sqlite3_vtab *pBase, int n){
  vtshim_vtab *pVtab = (vtshim_vtab*)pBase;
  vtshim_aux *pAux = pVtab->pAux;
  int rc;
  if( pAux->bDisposed ) return SQLITE_ERROR;
  rc = pAux->pMod->xRelease(pVtab->pChild, n);
  if( rc!=SQLITE_OK ){
    VTSHIM_COPY_ERRMSG();
  }
  return rc;
}

static int vtshimRollbackTo(sqlite3_vtab *pBase, int n){
  vtshim_vtab *pVtab = (vtshim_vtab*)pBase;
  vtshim_aux *pAux = pVtab->pAux;
  int rc;
  if( pAux->bDisposed ) return SQLITE_ERROR;
  rc = pAux->pMod->xRollbackTo(pVtab->pChild, n);
  if( rc!=SQLITE_OK ){
    VTSHIM_COPY_ERRMSG();
  }
  return rc;
}

/* The destructor function for a disposible module */
static void vtshimAuxDestructor(void *pXAux){
  vtshim_aux *pAux = (vtshim_aux*)pXAux;
  assert( pAux->pAllVtab==0 );
  if( !pAux->bDisposed && pAux->xChildDestroy ){
    pAux->xChildDestroy(pAux->pChildAux);
  }
  sqlite3_free(pAux->zName);
  sqlite3_free(pAux->pMod);
  sqlite3_free(pAux);
}

static int vtshimCopyModule(
  const sqlite3_module *pMod,   /* Source module to be copied */
  sqlite3_module **ppMod        /* Destination for copied module */
){
  sqlite3_module *p;
  if( !pMod || !ppMod ) return SQLITE_ERROR;
  p = sqlite3_malloc( sizeof(*p) );
  if( p==0 ) return SQLITE_NOMEM;
  memcpy(p, pMod, sizeof(*p));
  *ppMod = p;
  return SQLITE_OK;
}

#ifdef _WIN32
__declspec(dllexport)
#endif
void *sqlite3_create_disposable_module(
  sqlite3 *db,               /* SQLite connection to register module with */
  const char *zName,         /* Name of the module */
  const sqlite3_module *p,   /* Methods for the module */
  void *pClientData,         /* Client data for xCreate/xConnect */
  void(*xDestroy)(void*)     /* Module destructor function */
){
  vtshim_aux *pAux;
  sqlite3_module *pMod;
  int rc;
  pAux = sqlite3_malloc( sizeof(*pAux) );
  if( pAux==0 ){
    if( xDestroy ) xDestroy(pClientData);
    return 0;
  }
  rc = vtshimCopyModule(p, &pMod);
  if( rc!=SQLITE_OK ){
    sqlite3_free(pAux);
    return 0;
  }
  pAux->pChildAux = pClientData;
  pAux->xChildDestroy = xDestroy;
  pAux->pMod = pMod;
  pAux->db = db;
  pAux->zName = sqlite3_mprintf("%s", zName);
  pAux->bDisposed = 0;
  pAux->pAllVtab = 0;
  pAux->sSelf.iVersion = p->iVersion<=2 ? p->iVersion : 2;
  pAux->sSelf.xCreate = p->xCreate ? vtshimCreate : 0;
  pAux->sSelf.xConnect = p->xConnect ? vtshimConnect : 0;
  pAux->sSelf.xBestIndex = p->xBestIndex ? vtshimBestIndex : 0;
  pAux->sSelf.xDisconnect = p->xDisconnect ? vtshimDisconnect : 0;
  pAux->sSelf.xDestroy = p->xDestroy ? vtshimDestroy : 0;
  pAux->sSelf.xOpen = p->xOpen ? vtshimOpen : 0;
  pAux->sSelf.xClose = p->xClose ? vtshimClose : 0;
  pAux->sSelf.xFilter = p->xFilter ? vtshimFilter : 0;
  pAux->sSelf.xNext = p->xNext ? vtshimNext : 0;
  pAux->sSelf.xEof = p->xEof ? vtshimEof : 0;
  pAux->sSelf.xColumn = p->xColumn ? vtshimColumn : 0;
  pAux->sSelf.xRowid = p->xRowid ? vtshimRowid : 0;
  pAux->sSelf.xUpdate = p->xUpdate ? vtshimUpdate : 0;
  pAux->sSelf.xBegin = p->xBegin ? vtshimBegin : 0;
  pAux->sSelf.xSync = p->xSync ? vtshimSync : 0;
  pAux->sSelf.xCommit = p->xCommit ? vtshimCommit : 0;
  pAux->sSelf.xRollback = p->xRollback ? vtshimRollback : 0;
  pAux->sSelf.xFindFunction = p->xFindFunction ? vtshimFindFunction : 0;
  pAux->sSelf.xRename = p->xRename ? vtshimRename : 0;
  if( p->iVersion>=2 ){
    pAux->sSelf.xSavepoint = p->xSavepoint ? vtshimSavepoint : 0;
    pAux->sSelf.xRelease = p->xRelease ? vtshimRelease : 0;
    pAux->sSelf.xRollbackTo = p->xRollbackTo ? vtshimRollbackTo : 0;
  }else{
    pAux->sSelf.xSavepoint = 0;
    pAux->sSelf.xRelease = 0;
    pAux->sSelf.xRollbackTo = 0;
  }
  rc = sqlite3_create_module_v2(db, zName, &pAux->sSelf,
                                pAux, vtshimAuxDestructor);
  return rc==SQLITE_OK ? (void*)pAux : 0;
}

#ifdef _WIN32
__declspec(dllexport)
#endif
void sqlite3_dispose_module(void *pX){
  vtshim_aux *pAux = (vtshim_aux*)pX;
  if( !pAux->bDisposed ){
    vtshim_vtab *pVtab;
    vtshim_cursor *pCur;
    for(pVtab=pAux->pAllVtab; pVtab; pVtab=pVtab->pNext){
      for(pCur=pVtab->pAllCur; pCur; pCur=pCur->pNext){
        pAux->pMod->xClose(pCur->pChild);
      }
      pAux->pMod->xDisconnect(pVtab->pChild);
    }
    pAux->bDisposed = 1;
    if( pAux->xChildDestroy ) pAux->xChildDestroy(pAux->pChildAux);
  }
}


#endif /* SQLITE_OMIT_VIRTUALTABLE */

#ifdef _WIN32
__declspec(dllexport)
#endif
int sqlite3_vtshim_init(
  sqlite3 *db,
  char **pzErrMsg,
  const sqlite3_api_routines *pApi
){
  SQLITE_EXTENSION_INIT2(pApi);
  return SQLITE_OK;
}