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Overview
Comment:Add the ability to disable future calls to virtual table methods by invoking sqlite3_create_module() with a NULL sqlite3_module pointer.
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Timelines: family | ancestors | descendants | both | disable-vtab
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SHA1: 6b77d61adbc52a9d28ad522aa101c2c193942d18
User & Date: drh 2013-06-11 22:41:12
Context
2013-06-12
02:53
Another attempt at disabling virtual tables. This one leaks memory. Closed-Leaf check-in: 399e2828 user: drh tags: disable-vtab
2013-06-11
22:41
Add the ability to disable future calls to virtual table methods by invoking sqlite3_create_module() with a NULL sqlite3_module pointer. check-in: 6b77d61a user: drh tags: disable-vtab
14:22
Add the SQLITE_FTS3_MAX_EXPR_DEPTH compile time option. check-in: 24fc9d44 user: dan tags: trunk
Changes
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Changes to src/vtab.c.

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** are invoked only from within xCreate and xConnect methods.
*/
struct VtabCtx {
  VTable *pVTable;    /* The virtual table being constructed */
  Table *pTab;        /* The Table object to which the virtual table belongs */
};










































/*
** The actual function that does the work of creating a new module.
** This function implements the sqlite3_create_module() and
** sqlite3_create_module_v2() interfaces.
*/
static int createModule(
  sqlite3 *db,                    /* Database in which module is registered */
................................................................................
  const char *zName,              /* Name assigned to this module */
  const sqlite3_module *pModule,  /* The definition of the module */
  void *pAux,                     /* Context pointer for xCreate/xConnect */
  void (*xDestroy)(void *)        /* Module destructor function */
){
  int rc = SQLITE_OK;
  int nName;


  sqlite3_mutex_enter(db->mutex);
  nName = sqlite3Strlen30(zName);
  if( sqlite3HashFind(&db->aModule, zName, nName) ){

    rc = SQLITE_MISUSE_BKPT;
  }else{
    Module *pMod;



    pMod = (Module *)sqlite3DbMallocRaw(db, sizeof(Module) + nName + 1);
    if( pMod ){
      Module *pDel;
      char *zCopy = (char *)(&pMod[1]);
      memcpy(zCopy, zName, nName+1);
      pMod->zName = zCopy;
      pMod->pModule = pModule;







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** are invoked only from within xCreate and xConnect methods.
*/
struct VtabCtx {
  VTable *pVTable;    /* The virtual table being constructed */
  Table *pTab;        /* The Table object to which the virtual table belongs */
};

/*
** A place-holder virtual table method that always fails.
*/
static int errorMethod(void){ return SQLITE_ERROR; }

/*
** A dummy virtual table implementation in which every method fails.
*/
static const sqlite3_module errorModule = {
  /* iVersion      */ 2,
  /* xCreate       */ (int(*)(sqlite3*,void*,int,const char*const*,
                              sqlite3_vtab**,char**))errorMethod,
  /* xConnect      */ (int(*)(sqlite3*,void*,int,const char*const*,
                              sqlite3_vtab**,char**))errorMethod,
  /* xBestIndex    */ (int(*)(sqlite3_vtab*, sqlite3_index_info*))errorMethod,
  /* xDisconnect   */ (int(*)(sqlite3_vtab*))errorMethod,
  /* xDestroy      */ (int(*)(sqlite3_vtab*))errorMethod,
  /* xOpen         */ (int(*)(sqlite3_vtab*,sqlite3_vtab_cursor**))errorMethod,
  /* xClose        */ (int(*)(sqlite3_vtab_cursor*))errorMethod,
  /* xFilter       */ (int(*)(sqlite3_vtab_cursor*,int,const char*,int,
                              sqlite3_value**))errorMethod,
  /* xNext         */ (int(*)(sqlite3_vtab_cursor*))errorMethod,
  /* xEof          */ (int(*)(sqlite3_vtab_cursor*))errorMethod,
  /* xColumn       */ (int(*)(sqlite3_vtab_cursor*,sqlite3_context*,int))
                                                                   errorMethod,
  /* xRowid        */ (int(*)(sqlite3_vtab_cursor*,sqlite3_int64*))errorMethod,
  /* xUpdate       */ (int(*)(sqlite3_vtab*,int,sqlite3_value**,
                              sqlite3_int64*))errorMethod,
  /* xBegin        */ (int(*)(sqlite3_vtab*))errorMethod,
  /* xSync         */ (int(*)(sqlite3_vtab*))errorMethod,
  /* xCommit       */ (int(*)(sqlite3_vtab*))errorMethod,
  /* xRollback     */ (int(*)(sqlite3_vtab*))errorMethod,
  /* xFindFunction */ (int(*)(sqlite3_vtab*,int,const char*,
                             void(**)(sqlite3_context*,int,sqlite3_value**),
                             void**))errorMethod,
  /* xRename       */ (int(*)(sqlite3_vtab*,const char*))errorMethod,
  /* xSavepoint    */ (int(*)(sqlite3_vtab*,int))errorMethod,
  /* xRelease      */ (int(*)(sqlite3_vtab*,int))errorMethod,
  /* xRollbackTo   */ (int(*)(sqlite3_vtab*,int))errorMethod
};

/*
** The actual function that does the work of creating a new module.
** This function implements the sqlite3_create_module() and
** sqlite3_create_module_v2() interfaces.
*/
static int createModule(
  sqlite3 *db,                    /* Database in which module is registered */
................................................................................
  const char *zName,              /* Name assigned to this module */
  const sqlite3_module *pModule,  /* The definition of the module */
  void *pAux,                     /* Context pointer for xCreate/xConnect */
  void (*xDestroy)(void *)        /* Module destructor function */
){
  int rc = SQLITE_OK;
  int nName;
  Module *pMod;

  sqlite3_mutex_enter(db->mutex);
  nName = sqlite3Strlen30(zName);
  if( (pMod = sqlite3HashFind(&db->aModule, zName, nName))!=0 ){
    if( pModule!=0 ){
      rc = SQLITE_MISUSE_BKPT;
    }else{

      pMod->pModule = &errorModule;
    }
  }else{
    pMod = (Module *)sqlite3DbMallocRaw(db, sizeof(Module) + nName + 1);
    if( pMod ){
      Module *pDel;
      char *zCopy = (char *)(&pMod[1]);
      memcpy(zCopy, zName, nName+1);
      pMod->zName = zCopy;
      pMod->pModule = pModule;