jroesch commented on a change in pull request #5527: URL: https://github.com/apache/incubator-tvm/pull/5527#discussion_r437799906
########## File path: rust/macros/src/object.rs ########## @@ -0,0 +1,171 @@ +/* + * Licensed to the Apache Software Foundation (ASF) under one + * or more contributor license agreements. See the NOTICE file + * distributed with this work for additional information + * regarding copyright ownership. The ASF licenses this file + * to you under the Apache License, Version 2.0 (the + * "License"); you may not use this file except in compliance + * with the License. You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, + * software distributed under the License is distributed on an + * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY + * KIND, either express or implied. See the License for the + * specific language governing permissions and limitations + * under the License. + */ + +use proc_macro::TokenStream; +use proc_macro2::Span; +use quote::quote; +use syn::DeriveInput; +use syn::Ident; + +pub fn macro_impl(input: proc_macro::TokenStream) -> TokenStream { + let derive_input = syn::parse_macro_input!(input as DeriveInput); + let payload_id = derive_input.ident; + + let mut type_key = None; + let mut ref_name = None; + let base = Some(Ident::new("base", Span::call_site())); + + for attr in derive_input.attrs { + if attr.path.is_ident("type_key") { + type_key = Some(attr.parse_meta().expect("foo")) + } + + if attr.path.is_ident("ref_name") { + ref_name = Some(attr.parse_meta().expect("foo")) + } + } + + let type_key = if let Some(syn::Meta::NameValue(name_value)) = type_key { + match name_value.lit { + syn::Lit::Str(type_key) => type_key, + _ => panic!("foo"), + } + } else { + panic!("bar"); + }; + + let ref_name = if let Some(syn::Meta::NameValue(name_value)) = ref_name { + match name_value.lit { + syn::Lit::Str(ref_name) => ref_name, + _ => panic!("foo"), + } + } else { + panic!("bar"); + }; + + let ref_id = Ident::new(&ref_name.value(), Span::call_site()); + let base = base.expect("should be present"); + + let expanded = quote! { + unsafe impl tvm_rt::object::IsObject for #payload_id { + const TYPE_KEY: &'static str = #type_key; + + fn as_object<'s>(&'s self) -> &'s Object { + &self.#base.as_object() + } + } + + #[derive(Clone)] + pub struct #ref_id(Option<tvm_rt::object::ObjectPtr<#payload_id>>); + + impl tvm_rt::object::ToObjectRef for #ref_id { + fn to_object_ref(&self) -> ObjectRef { + ObjectRef(self.0.as_ref().map(|o| o.upcast())) + } + } + + impl std::ops::Deref for #ref_id { + type Target = #payload_id; + + fn deref(&self) -> &Self::Target { + self.0.as_ref().unwrap() + } + } + + impl std::convert::TryFrom<tvm_rt::RetValue> for #ref_id { + type Error = ::anyhow::Error; + + fn try_from(ret_val: tvm_rt::RetValue) -> Result<#ref_id, Self::Error> { + use std::convert::TryInto; + let oref: ObjectRef = ret_val.try_into()?; + let ptr = oref.0.ok_or(anyhow::anyhow!("null ptr"))?; Review comment: I am trying to remove my over zealous use of anyhow after Jason complained. ---------------------------------------------------------------- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: [email protected]
