SQLite

Check-in [fbb0672718]
Login

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

Overview
Comment:Fix sqlite3VdbeMakeWritable() to always clear the MEM_Ephem flag. Change the OP_Move opcode to always deephemeralize moved content.
Downloads: Tarball | ZIP archive
Timelines: family | ancestors | descendants | both | trunk
Files: files | file ages | folders
SHA1: fbb06727181eac1470b2dd458d2d159146439d21
User & Date: drh 2015-04-28 14:00:02.605
Context
2015-04-28
14:07
Fix an assert() failure that could occur if the internal sqlite3_rename_parent() SQL scalar function was invoked directly. (check-in: 36e5152618 user: dan tags: trunk)
14:00
Fix sqlite3VdbeMakeWritable() to always clear the MEM_Ephem flag. Change the OP_Move opcode to always deephemeralize moved content. (check-in: fbb0672718 user: drh tags: trunk)
12:44
Shift the Mem.pScopyFrom pointer in the correct direction in OP_Move. Fix for a defective check-in [a2135ad13049] and ticket [d6352363751]. Debugging code only - does not affect normal operation. (check-in: add4e043b3 user: drh tags: trunk)
Changes
Unified Diff Ignore Whitespace Patch
Changes to src/vdbe.c.
︙︙
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211

1212
1213
1214
1215
1216
1217
1218

  do{
    assert( pOut<=&aMem[(p->nMem-p->nCursor)] );
    assert( pIn1<=&aMem[(p->nMem-p->nCursor)] );
    assert( memIsValid(pIn1) );
    memAboutToChange(p, pOut);
    sqlite3VdbeMemMove(pOut, pIn1);
#ifdef SQLITE_DEBUG
    if( pOut->pScopyFrom>=&aMem[p1] && pOut->pScopyFrom<&aMem[p1+pOp->p3] ){
      pOut->pScopyFrom += pOp->p2 - p1;
    }
#endif

    REGISTER_TRACE(p2++, pOut);
    pIn1++;
    pOut++;
  }while( --n );
  break;
}









|



>








1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219

  do{
    assert( pOut<=&aMem[(p->nMem-p->nCursor)] );
    assert( pIn1<=&aMem[(p->nMem-p->nCursor)] );
    assert( memIsValid(pIn1) );
    memAboutToChange(p, pOut);
    sqlite3VdbeMemMove(pOut, pIn1);
#ifdef SQLITE_DEBUG
    if( pOut->pScopyFrom>=&aMem[p1] && pOut->pScopyFrom<pOut ){
      pOut->pScopyFrom += pOp->p2 - p1;
    }
#endif
    Deephemeralize(pOut);
    REGISTER_TRACE(p2++, pOut);
    pIn1++;
    pOut++;
  }while( --n );
  break;
}
︙︙
Changes to src/vdbemem.c.
︙︙
196
197
198
199
200
201
202


203
204
205
206
207
208
209
210
211
212
213

  if( (f&(MEM_Str|MEM_Blob)) && (pMem->szMalloc==0 || pMem->z!=pMem->zMalloc) ){
    if( sqlite3VdbeMemGrow(pMem, pMem->n + 2, 1) ){
      return SQLITE_NOMEM;
    }
    pMem->z[pMem->n] = 0;
    pMem->z[pMem->n+1] = 0;
    pMem->flags |= MEM_Term;


#ifdef SQLITE_DEBUG
    pMem->pScopyFrom = 0;
#endif
  }

  return SQLITE_OK;
}

/*
** If the given Mem* has a zero-filled tail, turn it into an ordinary
** blob stored in dynamically allocated space.








>
>

|

<








196
197
198
199
200
201
202
203
204
205
206
207

208
209
210
211
212
213
214

  if( (f&(MEM_Str|MEM_Blob)) && (pMem->szMalloc==0 || pMem->z!=pMem->zMalloc) ){
    if( sqlite3VdbeMemGrow(pMem, pMem->n + 2, 1) ){
      return SQLITE_NOMEM;
    }
    pMem->z[pMem->n] = 0;
    pMem->z[pMem->n+1] = 0;
    pMem->flags |= MEM_Term;
  }
  pMem->flags &= ~MEM_Ephem;
#ifdef SQLITE_DEBUG
  pMem->pScopyFrom = 0;
#endif


  return SQLITE_OK;
}

/*
** If the given Mem* has a zero-filled tail, turn it into an ordinary
** blob stored in dynamically allocated space.
︙︙