func (tm *TypeMap) interfaceFuncWrapper(f llvm.Value) llvm.Value {
ftyp := f.Type().ElementType()
paramTypes := ftyp.ParamTypes()
recvType := paramTypes[0]
paramTypes[0] = llvm.PointerType(llvm.Int8Type(), 0)
newf := llvm.AddFunction(f.GlobalParent(), f.Name()+".ifn", llvm.FunctionType(
ftyp.ReturnType(),
paramTypes,
ftyp.IsFunctionVarArg(),
))
b := llvm.GlobalContext().NewBuilder()
defer b.Dispose()
entry := llvm.AddBasicBlock(newf, "entry")
b.SetInsertPointAtEnd(entry)
args := make([]llvm.Value, len(paramTypes))
for i := range paramTypes {
args[i] = newf.Param(i)
}
recvBits := int(tm.target.TypeSizeInBits(recvType))
if recvBits > 0 {
args[0] = b.CreatePtrToInt(args[0], tm.target.IntPtrType(), "")
if args[0].Type().IntTypeWidth() > recvBits {
args[0] = b.CreateTrunc(args[0], llvm.IntType(recvBits), "")
}
args[0] = coerce(b, args[0], recvType)
} else {
args[0] = llvm.ConstNull(recvType)
}
result := b.CreateCall(f, args, "")
if result.Type().TypeKind() == llvm.VoidTypeKind {
b.CreateRetVoid()
} else {
b.CreateRet(result)
}
return newf
}