/// <summary>
/// Performs a stack layout of all local variables in the list.
/// </summary>
/// <param name="locals">The enumerable holding all locals.</param>
/// <param name="callingConvention">The cc.</param>
/// <param name="offsetOfFirst">Specifies the offset of the first stack operand in the list.</param>
/// <param name="direction">The direction.</param>
/// <returns></returns>
private int LayoutVariables(IList<Operand> locals, BaseCallingConvention callingConvention, int offsetOfFirst, int direction)
{
int offset = offsetOfFirst;
foreach (var operand in locals)
{
if (!operand.IsParameter && operand.IsStackLocal && operand.Uses.Count == 0 && operand.Definitions.Count == 0)
{
operand.Displacement = 0;
}
else
{
// Does the offset fit the alignment requirement?
int alignment = 0;
int size = 0;
int padding = 0;
int thisOffset = 0;
callingConvention.GetStackRequirements(TypeLayout, operand, out size, out alignment);
if (direction == 1)
{
padding = (offset % alignment);
offset -= (padding + size);
thisOffset = offset;
}
else
{
padding = (offset % alignment);
if (padding != 0)
padding = alignment - padding;
thisOffset = offset;
offset += (padding + size);
}
long existing = operand.Displacement;
operand.Displacement = thisOffset;
// adjust split children
if (operand.Low != null)
{
operand.Low.Displacement = thisOffset + (operand.Low.Displacement - existing);
}
if (operand.High != null)
{
operand.High.Displacement = thisOffset + (operand.High.Displacement - existing);
}
}
}
return offset;
}
