e40c039e65
Better to be loud that we don't support attaching arbitrary host info to `externref`s than to limp along and pretend we do support it. Supporting it properly won't reuse any of this code anyways.
115 lines
3.5 KiB
Rust
115 lines
3.5 KiB
Rust
//! A set of convenience macros for our wasmtime-c-api crate.
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//!
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//! These are intended to mirror the macros in the `wasm.h` header file and
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//! largely facilitate the `declare_ref` macro.
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extern crate proc_macro;
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use proc_macro2::{Ident, TokenStream, TokenTree};
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use quote::quote;
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fn extract_ident(input: proc_macro::TokenStream) -> Ident {
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let input = TokenStream::from(input);
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let i = match input.into_iter().next().unwrap() {
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TokenTree::Ident(i) => i,
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_ => panic!("expected an ident"),
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};
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let name = i.to_string();
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assert!(name.ends_with("_t"));
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return i;
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}
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#[proc_macro]
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pub fn declare_own(input: proc_macro::TokenStream) -> proc_macro::TokenStream {
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let ty = extract_ident(input);
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let name = ty.to_string();
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let delete = quote::format_ident!("{}_delete", &name[..name.len() - 2]);
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(quote! {
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#[no_mangle]
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pub extern fn #delete(_: Box<#ty>) {}
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})
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.into()
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}
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#[proc_macro]
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pub fn declare_ty(input: proc_macro::TokenStream) -> proc_macro::TokenStream {
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let ty = extract_ident(input);
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let name = ty.to_string();
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let copy = quote::format_ident!("{}_copy", &name[..name.len() - 2]);
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(quote! {
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wasmtime_c_api_macros::declare_own!(#ty);
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#[no_mangle]
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pub extern fn #copy(src: &#ty) -> Box<#ty> {
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Box::new(src.clone())
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}
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})
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.into()
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}
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#[proc_macro]
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pub fn declare_ref(input: proc_macro::TokenStream) -> proc_macro::TokenStream {
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let ty = extract_ident(input);
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let name = ty.to_string();
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let prefix = &name[..name.len() - 2];
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let copy = quote::format_ident!("{}_copy", prefix);
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let same = quote::format_ident!("{}_same", prefix);
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let get_host_info = quote::format_ident!("{}_get_host_info", prefix);
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let set_host_info = quote::format_ident!("{}_set_host_info", prefix);
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let set_host_info_final = quote::format_ident!("{}_set_host_info_with_finalizer", prefix);
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let as_ref = quote::format_ident!("{}_as_ref", prefix);
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let as_ref_const = quote::format_ident!("{}_as_ref_const", prefix);
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(quote! {
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wasmtime_c_api_macros::declare_own!(#ty);
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#[no_mangle]
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pub extern fn #copy(src: &#ty) -> Box<#ty> {
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Box::new(src.clone())
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}
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#[no_mangle]
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pub extern fn #same(a: &#ty, b: &#ty) -> bool {
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a.externref().ptr_eq(&b.externref())
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}
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#[no_mangle]
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pub extern fn #get_host_info(a: &#ty) -> *mut std::os::raw::c_void {
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std::ptr::null_mut()
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}
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#[no_mangle]
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pub extern fn #set_host_info(a: &#ty, info: *mut std::os::raw::c_void) {
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eprintln!("`{}` is not implemented", stringify!(#set_host_info));
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std::process::abort();
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}
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#[no_mangle]
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pub extern fn #set_host_info_final(
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a: &#ty,
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info: *mut std::os::raw::c_void,
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finalizer: Option<extern "C" fn(*mut std::os::raw::c_void)>,
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) {
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eprintln!("`{}` is not implemented", stringify!(#set_host_info_final));
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std::process::abort();
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}
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#[no_mangle]
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pub extern fn #as_ref(a: &#ty) -> Box<crate::wasm_ref_t> {
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let r = Some(a.externref());
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Box::new(crate::wasm_ref_t { r })
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}
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#[no_mangle]
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pub extern fn #as_ref_const(a: &#ty) -> Box<crate::wasm_ref_t> {
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#as_ref(a)
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}
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// TODO: implement `wasm_ref_as_#name#`
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// TODO: implement `wasm_ref_as_#name#_const`
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})
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.into()
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}
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