Use a hash instead of an array for indexing loggables.

Timeline/Loggable.C

@@ -48,8 +48,7 @@ int Loggable::_level = 0;
 
 off_t Loggable::_undo_offset = 0;
 
-size_t Loggable::_loggables_size = 0;
-Loggable ** Loggable::_loggables;
+std::map <unsigned int, Loggable *> Loggable::_loggables;
 std::map <unsigned int, Log_Entry *> Loggable::_loggables_unjournaled;
 
 std::map <std::string, create_func*> Loggable::_class_map;
@@ -65,31 +64,12 @@ void *Loggable::_snapshot_callback_arg = NULL;
 
 Loggable::~Loggable ( )
 {
-    _loggables[ _id - 1 ] = NULL;
+    _loggables[ _id ] = NULL;
 }
 
 
 
 
-/** ensure that _loggables array is big enough for /n/ elements */
-void
-Loggable::ensure_size ( size_t n )
-{
-    if ( n > _loggables_size )
-    {
-        size_t p = 0;
-        while ( ( (unsigned)1 << p ) < n ) ++p;
-
-        size_t os = _loggables_size;
-        _loggables_size = 1 << p ;
-
-        _loggables = (Loggable**) realloc( _loggables, sizeof( Loggable ** ) * _loggables_size );
-
-        for ( unsigned int i = os; i < _loggables_size; ++i )
-            _loggables[ i ] = 0;
-    }
-}
-
 void
 Loggable::block_start ( void )
 {
@@ -110,10 +90,7 @@ Loggable::block_end ( void )
 Loggable *
 Loggable::find ( unsigned int id )
 {
-    if ( id > _log_id )
-        return NULL;
-
-    return _loggables[ id - 1 ];
+    return _loggables[ id ];
 }
 
 
@@ -175,7 +152,7 @@ Loggable::load_unjournaled_state ( void )
     {
         Log_Entry *e = new Log_Entry( buf );
 
-        _loggables_unjournaled[ id - 1 ] = e;
+        _loggables_unjournaled[ id ] = e;
 
         Loggable *l = Loggable::find( id );
     }
@@ -242,21 +219,18 @@ Loggable::close ( void )
     if ( ! snapshot( "snapshot" ) )
         WARNING( "Failed to create snapshot" );
 
-    for ( unsigned int i = 0; i < _log_id - 1; ++i )
-    {
-        Loggable ** l = &_loggables[ i ];
 
-        if ( *l )
+    for ( std::map <unsigned int, Loggable *>::iterator i = _loggables.begin();
+          i != _loggables.end(); ++i )
+    {
+        if ( i->second )
         {
-            delete *l;
-            *l = NULL;
+            delete i->second;
         }
     }
 
     save_unjournaled_state();
 
-    _log_id = 0;
-
     return true;
 }
 
@@ -271,15 +245,14 @@ Loggable::save_unjournaled_state ( void )
 
     /* write out the unjournaled state of all currently active
      * loggables */
-    for ( int i = 0; i < _log_id - 1; ++i )
+    for ( std::map <unsigned int, Log_Entry *>::iterator i = _loggables_unjournaled.begin();
+          i != _loggables_unjournaled.end(); ++i )
     {
-        Log_Entry *e = _loggables_unjournaled[ i ];
-
-        if ( e )
+        if ( i->second )
         {
-            char *s = e->print();
+            char *s = i->second->print();
 
-            fprintf( fp, "0x%X set %s\n", i + 1, s );
+            fprintf( fp, "0x%X set %s\n", i->first, s );
 
             free( s );
         }
@@ -298,9 +271,9 @@ Loggable::update_id ( unsigned int id )
 {
     /* make sure we're the last one */
     assert( _id == _log_id );
-    assert( _loggables[ _id - 1 ] == this );
+    assert( _loggables[ _id ] == this );
 
-    _loggables[ _id - 1 ] = NULL;
+    _loggables[ _id ] = NULL;
 
     _log_id = max( _log_id, id );
 
@@ -309,13 +282,10 @@ Loggable::update_id ( unsigned int id )
 
     _id = id;
 
-    /* make sure it'll fit */
-    ensure_size( _id );
+    if ( _loggables[ _id ] )
+        FATAL( "Attempt to create object with an ID (0x%X) that already exists. The existing object is of type \"%s\", the new one is \"%s\". Corrupt journal?", _id, _loggables[ _id ]->class_name(), class_name() );
 
-    if ( _loggables[ _id - 1 ] )
-        FATAL( "Attempt to create object with an ID (0x%X) that already exists. The existing object is of type \"%s\", the new one is \"%s\". Corrupt journal?", _id, _loggables[ _id - 1 ]->class_name(), class_name() );
-
-    _loggables[ _id - 1 ] = this;
+    _loggables[ _id ] = this;
 }
 
 /** return a pointer to a static copy of /s/ with all special characters escaped */
@@ -415,8 +385,10 @@ Loggable::do_this ( const char *s, bool reverse )
             /* we're now creating a loggable. Apply any unjournaled
              * state it may have had in the past under this log ID */
 
-            if ( _loggables_unjournaled[ id - 1 ] )
-                l->set( *_loggables_unjournaled[ id - 1 ] );
+            Log_Entry *e = _loggables_unjournaled[ id ];
+
+            if ( e )
+                l->set( *e );
         }
 
     }
@@ -717,19 +689,19 @@ Loggable::record_unjournaled ( void ) const
 
     get_unjournaled( *e );
 
-    Log_Entry **le = &_loggables_unjournaled[ _id - 1 ];
+    Log_Entry *le = _loggables_unjournaled[ _id ];
 
-    if ( *le )
-        delete *le;
+    if ( le )
+        delete le;
 
     if ( e->size() )
     {
-        *le = e;
-        DMESSAGE( "logging %s", (*le)->print() );
+        _loggables_unjournaled[ _id ] = e;
+        DMESSAGE( "logging %s", e->print() );
     }
     else
         /* don't waste space on loggables with no unjournaled properties */
-        *le = NULL;
+        _loggables_unjournaled[ _id ] = NULL;
 }
 
 /** Log object destruction. *Must* be called at the beginning of the

Timeline/Loggable.H

@@ -71,8 +71,7 @@ class Loggable
 
     static off_t _undo_offset;
 
-    static size_t _loggables_size;
-    static Loggable ** _loggables;
+    static std::map <unsigned int, Loggable *> _loggables;
     static std::map <unsigned int, Log_Entry *> _loggables_unjournaled;
 
     static std::map <std::string, create_func*> _class_map;
@@ -115,9 +114,7 @@ private:
             {
                 _id = ++_log_id;
 
-                ensure_size( _id );
-
-                _loggables[ _id - 1 ] = this;
+                _loggables[ _id ] = this;
             }
             else
                 _id = 0;