/// <summary>
/// Gets the item that is the specified number of elements below the stack top. 0 is the top.
/// </summary>
/// <param name="distanceFromStackTop">How far to look down (0=not)</param>
/// <returns>Stack Item</returns>
public AVM1DataElement this[uint distanceFromStackTop]
{
get
{
int realIndex = ( _InternalStack.Count - 1 ) - (int)distanceFromStackTop;
if ( realIndex >= 0 )
{
return _InternalStack[ realIndex ];
}
else
{
AVM1DataElement e = new AVM1DataElement();
e.Value = null;
e.DataType = AVM1DataTypes.AVM_UNKNOWN;
return e;
}
}
}
/// <summary>
///
/// </summary>
/// <param name="code"></param>
/// <param name="instructionIndex"></param>
/// <param name="stackIn"></param>
/// <param name="argc"></param>
/// <param name="entry"></param>
/// <returns></returns>
public static bool TraceArgument( AVM1Code code, int instructionIndex, AVM1Stack stackIn, uint argc, out AVM1DataElement entry )
{
if ( null == stackIn)
stackIn = new AVM1Stack();
int indexInBlock;
BasicBlock home = code.Flowgraph.BlockOfInstruction( ( uint )instructionIndex, out indexInBlock );
if ( null == home )
{
throw new Exception( "FUCKUP: instuction index " + instructionIndex.ToString( "d" ) + " not found in AVM1Code graph" );
}
for ( int i = 0; i < indexInBlock; i++ )
{
if ( code[ ( int )home.Indices[ i ] ].IsStackPredictable )
{
code[ ( int )home.Indices[ i ] ].PerformStackOperations( stackIn );
}
else
{
entry = default( AVM1DataElement );
return false;
}
}
if ( stackIn.Count > argc )
{
entry = stackIn[ argc ];
return true;
}
else
{
entry = default(AVM1DataElement);
return false;
}
}
/// <summary>
///
/// </summary>
/// <returns></returns>
public AVM1DataElement Pop()
{
_SP--;
if ( _SP > 0 )
{
AVM1DataElement e = _InternalStack[ _InternalStack.Count - 1 ];
_InternalStack.RemoveAt( _InternalStack.Count - 1 );
return e;
}
else
{
AVM1DataElement e = new AVM1DataElement();
e.Value = null;
e.DataType = AVM1DataTypes.AVM_UNKNOWN;
return e;
}
}
/// <summary>
///
/// </summary>
/// <param name="element"></param>
public void Push( AVM1DataElement element )
{
_SP++;
if ( _SP >= 0 )
_InternalStack.Add( element );
}
/// <summary>
///
/// </summary>
/// <param name="elements"></param>
public void Fill( AVM1DataElement[] elements )
{
_InternalStack.Clear();
for ( int i = 0; i < elements.Length; i++ )
{
_InternalStack.Add( elements[ i ] );
}
}
