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SQLite training in Houston TX on 2019-11-05 (details)
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Overview
Comment:Small size reduction and performance increase for releaseMemArray().
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SHA1: 24cd32d681df58f687b2afbe4b13d579e3efdd4b
User & Date: drh 2014-09-19 16:13:12
Context
2014-09-19
16:56
Remove a local variable from the OP_Column implementation, resulting in a modest size reduction and a performance increase. check-in: 6199760d user: drh tags: trunk
16:13
Small size reduction and performance increase for releaseMemArray(). check-in: 24cd32d6 user: drh tags: trunk
16:02
Updates to comments. No code changes. check-in: 9b42c3da user: drh tags: trunk
Changes
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Changes to src/vdbeaux.c.

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#endif

/*
** Release an array of N Mem elements
*/
static void releaseMemArray(Mem *p, int N){
  if( p && N ){
    Mem *pEnd;
    sqlite3 *db = p->db;
    u8 malloc_failed = db->mallocFailed;
    if( db->pnBytesFreed ){
      for(pEnd=&p[N]; p<pEnd; p++){
        if( p->szMalloc ) sqlite3DbFree(db, p->zMalloc);
      }
      return;
    }
    for(pEnd=&p[N]; p<pEnd; p++){
      assert( (&p[1])==pEnd || p[0].db==p[1].db );
      assert( sqlite3VdbeCheckMemInvariants(p) );

      /* This block is really an inlined version of sqlite3VdbeMemRelease()
      ** that takes advantage of the fact that the memory cell value is 
      ** being set to NULL after releasing any dynamic resources.
      **
................................................................................
        sqlite3VdbeMemRelease(p);
      }else if( p->szMalloc ){
        sqlite3DbFree(db, p->zMalloc);
        p->szMalloc = 0;
      }

      p->flags = MEM_Undefined;
    }
    db->mallocFailed = malloc_failed;
  }
}

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







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#endif

/*
** 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;
    u8 malloc_failed = db->mallocFailed;
    if( db->pnBytesFreed ){
      do{
        if( p->szMalloc ) sqlite3DbFree(db, p->zMalloc);
      }while( (++p)<pEnd );
      return;
    }
    do{
      assert( (&p[1])==pEnd || p[0].db==p[1].db );
      assert( sqlite3VdbeCheckMemInvariants(p) );

      /* This block is really an inlined version of sqlite3VdbeMemRelease()
      ** that takes advantage of the fact that the memory cell value is 
      ** being set to NULL after releasing any dynamic resources.
      **
................................................................................
        sqlite3VdbeMemRelease(p);
      }else if( p->szMalloc ){
        sqlite3DbFree(db, p->zMalloc);
        p->szMalloc = 0;
      }

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

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