private BlobHandle GetMethodSignatureBlobHandle(MethodSignature sig)
{
EmbeddedSignatureDataEmitter signatureDataEmitter;
if (sig.HasEmbeddedSignatureData)
{
signatureDataEmitter = new EmbeddedSignatureDataEmitter(sig.GetEmbeddedSignatureData(), this);
}
else
{
signatureDataEmitter = EmbeddedSignatureDataEmitter.EmptySingleton;
}
BlobBuilder memberRefSig = new BlobBuilder();
EncodeMethodSignature(memberRefSig, sig, signatureDataEmitter);
if (!signatureDataEmitter.Complete)
{
throw new ArgumentException();
}
var sigBlob = _metadataBuilder.GetOrAddBlob(memberRefSig);
return(sigBlob);
}
/// <summary>
/// Gets calling conventions for a standalone ('calli') method signature.
/// </summary>
public static UnmanagedCallingConventions GetStandaloneMethodSignatureCallingConventions(this MethodSignature signature)
{
// If calling convention is anything but 'unmanaged', or there's no modifiers, we can bitcast to our enum and we're done.
MethodSignatureFlags unmanagedCallconv = signature.Flags & MethodSignatureFlags.UnmanagedCallingConventionMask;
if (unmanagedCallconv != MethodSignatureFlags.UnmanagedCallingConvention)
{
Debug.Assert((int)MethodSignatureFlags.UnmanagedCallingConventionCdecl == (int)UnmanagedCallingConventions.Cdecl &&
(int)MethodSignatureFlags.UnmanagedCallingConventionStdCall == (int)UnmanagedCallingConventions.Stdcall &&
(int)MethodSignatureFlags.UnmanagedCallingConventionThisCall == (int)UnmanagedCallingConventions.Thiscall);
Debug.Assert(unmanagedCallconv != 0);
return((UnmanagedCallingConventions)unmanagedCallconv);
}
// If calling convention is 'unmanaged', there might be more metadata in the custom modifiers.
UnmanagedCallingConventions result = 0;
if (signature.HasEmbeddedSignatureData)
{
foreach (EmbeddedSignatureData data in signature.GetEmbeddedSignatureData())
{
if (data.kind != EmbeddedSignatureDataKind.OptionalCustomModifier)
{
continue;
}
// We only care about the modifiers for the return type. These will be at the start of
// the signature, so will be first in the array of embedded signature data.
if (data.index != MethodSignature.IndexOfCustomModifiersOnReturnType)
{
break;
}
if (data.type is not MetadataType mdType)
{
continue;
}
result = AccumulateCallingConventions(result, mdType);
}
}
// If we haven't found a calling convention in the modifiers, the calling convention is 'unmanaged'.
if ((result & UnmanagedCallingConventions.CallingConventionMask) == 0)
{
result |= GetPlatformDefaultUnmanagedCallingConvention(signature.Context);
}
return(result);
}
