public static IntPtr AllocateArray(RuntimeTypeHandle handle, uint elementSize, uint elements)
{
// An array has the following memory layout:
// - IntPtr TypeDef
// - IntPtr SyncBlock
// - int length
// - ElementType[length] elements
// - Padding
uint allocationSize = ((uint)(IntPtr.Size) * 3) + (elements * elementSize);
allocationSize = (allocationSize + 3) & ~3u; // Align to 4-bytes boundary
var memory = GC.AllocateObject(allocationSize);
Intrinsic.Store(memory, 0, handle.Value);
if (IntPtr.Size == 4)
{
Intrinsic.Store32(memory, IntPtr.Size, 0);
Intrinsic.Store32(memory, IntPtr.Size * 2, elements);
}
else
{
Intrinsic.Store64(memory, IntPtr.Size, 0);
Intrinsic.Store64(memory, IntPtr.Size * 2, elements);
}
return(memory);
}
public static IntPtr Box16(RuntimeTypeHandle handle, ushort value)
{
var memory = AllocateObject(handle, IntPtr.Size);
Intrinsic.Store(memory, 0, handle.Value);
Intrinsic.Store16(memory, IntPtr.Size * 2, value);
return(memory);
}
public static IntPtr BoxR8(RuntimeTypeHandle handle, double value)
{
var memory = AllocateObject(handle, IntPtr.Size * 2);
Intrinsic.Store(memory, 0, handle.Value);
Intrinsic.StoreR8(memory, IntPtr.Size * 2, value);
return(memory);
}
public static IntPtr AllocateObject(RuntimeTypeHandle handle, uint classSize)
{
// An object has the following memory layout:
// - IntPtr TypeDef
// - IntPtr SyncBlock
// - 0 .. n object data fields
var memory = GC.AllocateObject((2 * (uint)(IntPtr.Size)) + classSize);
Intrinsic.Store(memory, 0, handle.Value);
if (IntPtr.Size == 4)
{
Intrinsic.Store32(memory, IntPtr.Size, 0);
}
else
{
Intrinsic.Store64(memory, IntPtr.Size, 0);
}
return(memory);
}
