ArgIterator.cs

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using System.Runtime.CompilerServices;
 
namespace System;
 
public ref struct ArgIterator
{
    private IntPtr ArgCookie;
 
    private IntPtr sigPtr;
 
    private IntPtr sigPtrLen;
 
    private IntPtr ArgPtr;
 
    private int RemainingArgs;
 
    [MethodImpl(MethodImplOptions.InternalCall)]
    private extern ArgIterator(IntPtr arglist);
 
    public ArgIterator(RuntimeArgumentHandle arglist)
        : this(arglist.Value)
    {
    }
 
    [MethodImpl(MethodImplOptions.InternalCall)]
    private unsafe extern ArgIterator(IntPtr arglist, void* ptr);
 
    [CLSCompliant(false)]
    public unsafe ArgIterator(RuntimeArgumentHandle arglist, void* ptr)
        : this(arglist.Value, ptr)
    {
    }
 
    [CLSCompliant(false)]
    public unsafe TypedReference GetNextArg()
    {
        TypedReference result = default(TypedReference);
        FCallGetNextArg(&result);
        return result;
    }
 
    [MethodImpl(MethodImplOptions.InternalCall)]
    private unsafe extern void FCallGetNextArg(void* result);
 
    [CLSCompliant(false)]
    public unsafe TypedReference GetNextArg(RuntimeTypeHandle rth)
    {
        if (sigPtr != IntPtr.Zero)
        {
            return GetNextArg();
        }
        if (ArgPtr == IntPtr.Zero)
        {
            throw new ArgumentNullException();
        }
        TypedReference result = default(TypedReference);
        InternalGetNextArg(&result, rth.GetRuntimeType());
        return result;
    }
 
    [MethodImpl(MethodImplOptions.InternalCall)]
    private unsafe extern void InternalGetNextArg(void* result, RuntimeType rt);
 
    public void End()
    {
    }
 
    [MethodImpl(MethodImplOptions.InternalCall)]
    public extern int GetRemainingCount();
 
    [MethodImpl(MethodImplOptions.InternalCall)]
    private unsafe extern void* _GetNextArgType();
 
    public unsafe RuntimeTypeHandle GetNextArgType()
    {
        return new RuntimeTypeHandle(Type.GetTypeFromHandleUnsafe((IntPtr)_GetNextArgType()));
    }
 
    public override int GetHashCode()
    {
        return ValueType.GetHashCodeOfPtr(ArgCookie);
    }
 
    public override bool Equals(object? o)
    {
        throw new NotSupportedException(SR.NotSupported_NYI);
    }
}