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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
using Internal.TypeSystem;
namespace Internal.IL.Stubs
{
/// <summary>
/// Thunk to marshal calli PInvoke parameters and invoke the appropriate function pointer
/// </summary>
public partial class CalliMarshallingMethodThunk : ILStubMethod
{
private readonly MethodSignature _targetSignature;
private readonly InteropStateManager _interopStateManager;
private readonly TypeDesc _owningType;
private MethodSignature _signature;
public CalliMarshallingMethodThunk(MethodSignature targetSignature, TypeDesc owningType,
InteropStateManager interopStateManager,
bool runtimeMarshallingEnabled)
{
_targetSignature = targetSignature;
_owningType = owningType;
_interopStateManager = interopStateManager;
RuntimeMarshallingEnabled = runtimeMarshallingEnabled;
}
public MethodSignature TargetSignature
{
get
{
return _targetSignature;
}
}
public override TypeSystemContext Context
{
get
{
return _owningType.Context;
}
}
public override TypeDesc OwningType
{
get
{
return _owningType;
}
}
public override MethodSignature Signature
{
get
{
if (_signature == null)
{
// Prepend fnptr argument to the signature
TypeDesc[] parameterTypes = new TypeDesc[_targetSignature.Length + 1];
for (int i = 0; i < _targetSignature.Length; i++)
parameterTypes[i] = _targetSignature[i];
parameterTypes[parameterTypes.Length - 1] = Context.GetWellKnownType(WellKnownType.IntPtr);
_signature = new MethodSignature(MethodSignatureFlags.Static, 0, _targetSignature.ReturnType, parameterTypes);
}
return _signature;
}
}
public override string Name
{
get
{
return "CalliMarshallingMethodThunk";
}
}
public override string DiagnosticName
{
get
{
return "CalliMarshallingMethodThunk";
}
}
public bool RuntimeMarshallingEnabled { get; }
public override PInvokeMetadata GetPInvokeMethodMetadata()
{
// Return PInvokeAttributes.PreserveSig to circumvent marshalling required checks
return new PInvokeMetadata(null, null, PInvokeAttributes.PreserveSig);
}
public override MethodIL EmitIL()
{
return PInvokeILEmitter.EmitIL(this, default(PInvokeILEmitterConfiguration), _interopStateManager);
}
}
}
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