public DynamicInvokeMethodThunk(TypeDesc owningType, DynamicInvokeMethodSignature signature)
{
_owningType = owningType;
_targetSignature = signature;
}
public override MethodIL EmitIL()
{
ILEmitter emitter = new ILEmitter();
var codeStream = emitter.NewCodeStream();
ILCodeLabel returnNullLabel = emitter.NewCodeLabel();
bool hasDynamicInvokeThunk = (_delegateInfo.SupportedFeatures & DelegateFeature.DynamicInvoke) != 0 &&
DynamicInvokeMethodThunk.SupportsSignature(_delegateInfo.Signature);
ILCodeLabel[] labels = new ILCodeLabel[(int)DelegateThunkCollection.MaxThunkKind];
for (DelegateThunkKind i = 0; i < DelegateThunkCollection.MaxThunkKind; i++)
{
MethodDesc thunk = _delegateInfo.Thunks[i];
if (thunk != null ||
(i == DelegateThunkKind.DelegateInvokeThunk && hasDynamicInvokeThunk))
{
labels[(int)i] = emitter.NewCodeLabel();
}
else
{
labels[(int)i] = returnNullLabel;
}
}
codeStream.EmitLdArg(1);
codeStream.EmitSwitch(labels);
codeStream.Emit(ILOpcode.br, returnNullLabel);
for (DelegateThunkKind i = 0; i < DelegateThunkCollection.MaxThunkKind; i++)
{
MethodDesc targetMethod = null;
// Dynamic invoke thunk is special since we're calling into a shared helper
if (i == DelegateThunkKind.DelegateInvokeThunk && hasDynamicInvokeThunk)
{
Debug.Assert(_delegateInfo.Thunks[i] == null);
var sig = new DynamicInvokeMethodSignature(_delegateInfo.Signature);
MethodDesc thunk = Context.GetDynamicInvokeThunk(sig);
if (thunk.HasInstantiation)
{
TypeDesc[] inst = DynamicInvokeMethodThunk.GetThunkInstantiationForMethod(_delegateInfo.Type.InstantiateAsOpen().GetMethod("Invoke", null));
targetMethod = Context.GetInstantiatedMethod(thunk, new Instantiation(inst));
}
else
{
targetMethod = thunk;
}
}
else
{
MethodDesc thunk = _delegateInfo.Thunks[i];
if (thunk != null)
{
targetMethod = thunk.InstantiateAsOpen();
}
}
if (targetMethod != null)
{
codeStream.EmitLabel(labels[(int)i]);
codeStream.Emit(ILOpcode.ldftn, emitter.NewToken(targetMethod));
codeStream.Emit(ILOpcode.ret);
}
}
codeStream.EmitLabel(returnNullLabel);
codeStream.EmitLdc(0);
codeStream.Emit(ILOpcode.conv_i);
codeStream.Emit(ILOpcode.ret);
return(emitter.Link(this));
}
