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use super::{to_ident::ToIdent, type_ref_ext::TypeRefExt, StringExt};
use proc_macro2::TokenStream;
use quote::{quote, ToTokens};
use syn::Index;
use witx::{Document, Id};
pub(crate) fn generate_interfaces(document: &Document, version: &str) -> TokenStream {
let wasi_snapshot_id = Id::new(&version);
let wasi_module = document
.module(&wasi_snapshot_id)
.expect("Could not find the WASI snapshot module.");
let wasi_trait_functions = wasi_module.funcs().map(|func| {
let docs = func.docs.as_docs();
let param_docs = func
.params
.iter()
.map(|p| format!("* {}: {}", p.name.as_str(), p.docs).as_docs());
let result_docs = func
.results
.iter()
.map(|p| format!("* {}", p.docs).as_docs());
let ident = func.name.to_ident_native(None);
let params = func.params.iter().map(|p| {
let ident = p.name.to_ident_native(None);
if p.tref.is_string() {
let len_ident = format!("{}_len", p.name.as_str()).to_ident_native(None);
return quote! { #ident: witx_gen::WasmSlicePtr<u8>, #len_ident: size };
}
if let Some(inner) = p.tref.as_array() {
let inner_type = inner.name.to_ident_native(None);
let len_ident = format!("{}_len", p.name.as_str()).to_ident_native(None);
return quote! { #ident: witx_gen::WasmSlicePtr<#inner_type>, #len_ident: size };
}
let tp = p.tref.to_type();
quote! { #ident: #tp }
});
let results = if func.results.len() == 0 && func.name.as_str() == "proc_exit" {
quote! { std::result::Result<std::convert::Infallible, exitcode> }
} else {
let results = func.results.iter().map(|p| {
let typename = p.tref.to_type();
quote! { #typename }
});
quote! { ( #( #results ),* ) }
};
quote! {
#docs
#[doc = "# Parameters"]
#[doc = "* ctx: The WASM runtime context"]
#( #param_docs )*
#[doc = "# Results"]
#( #result_docs )*
fn #ident(&self, ctx: &mut witx_gen::reexports::Ctx, #( #params ),*) -> #results;
}
});
let wasi_trait_impls_arc = wasi_module.funcs().map(|func| {
let ident = func.name.to_ident_native(None);
let params = func.params.iter().map(|p| {
let ident = p.name.to_ident_native(None);
if p.tref.is_string() {
let len_ident = format!("{}_len", p.name.as_str()).to_ident_native(None);
return quote! { #ident: witx_gen::WasmSlicePtr<u8>, #len_ident: size };
}
if let Some(inner) = p.tref.as_array() {
let inner_type = inner.name.to_ident_native(None);
let len_ident = format!("{}_len", p.name.as_str()).to_ident_native(None);
return quote! { #ident: witx_gen::WasmSlicePtr<#inner_type>, #len_ident: size };
}
let tp = p.tref.to_type();
quote! { #ident: #tp }
});
let param_names = func.params.iter().map(|p| {
let ident = p.name.to_ident_native(None);
if p.tref.is_string() {
let len_ident = format!("{}_len", p.name.as_str()).to_ident_native(None);
return quote! { #ident, #len_ident };
}
if let Some(_) = p.tref.as_array() {
let len_ident = format!("{}_len", p.name.as_str()).to_ident_native(None);
return quote! { #ident, #len_ident };
}
quote! { #ident }
});
let results = if func.results.len() == 0 && func.name.as_str() == "proc_exit" {
quote! { std::result::Result<std::convert::Infallible, exitcode> }
} else {
let results = func.results.iter().map(|p| {
let typename = p.tref.to_type();
quote! { #typename }
});
quote! { ( #( #results ),* ) }
};
quote! {
fn #ident(&self, ctx: &mut witx_gen::reexports::Ctx, #( #params ),*) -> #results {
(**self).#ident(ctx, #( #param_names ),*)
}
}
});
let wasi_trait_impls = wasi_module.funcs().map(|func| {
let name = func.name.as_str();
let ident = func.name.to_ident_native(None);
let param_names = func
.params
.iter()
.map(|p| {
let ident = p.name.to_ident_native(None);
if p.tref.is_string() {
let len_ident = format!("{}_len", p.name.as_str()).to_ident_native(None);
return quote! { #ident, #len_ident };
}
if let Some(_) = p.tref.as_array() {
let len_ident = format!("{}_len", p.name.as_str()).to_ident_native(None);
return quote! { #ident, #len_ident };
}
ident.to_token_stream()
});
let params = func.params.iter().map(|p| {
let ident = p.name.to_ident_native(None);
if let witx::TypeRef::Value(ref tp) = p.tref {
if let witx::Type::Builtin(ref builtin_type) = **tp {
if let witx::BuiltinType::String = builtin_type {
let len_ident = format!("{}_len", p.name.as_str()).to_ident_native(None);
return quote! { #ident: witx_gen::WasmSlicePtr<u8>, #len_ident: size };
}
}
}
if let witx::TypeRef::Name(ref named) = p.tref {
if let witx::TypeRef::Value(ref tp) = named.tref {
if let witx::Type::Array(ref inner) = **tp {
if let witx::TypeRef::Name(ref inner_named) = inner {
let inner_type = inner_named.name.to_ident_native(None);
let len_ident = format!("{}_len", p.name.as_str()).to_ident_native(None);
return quote! { #ident: witx_gen::WasmSlicePtr<#inner_type>, #len_ident: size };
}
}
}
}
let tp = p.tref.to_type();
quote! { #ident: #tp }
});
let extra_params = func.results.iter().enumerate().skip(1).map(|(i, p)| {
let tp = p.tref.to_type();
let ident = format!("ret_{}", i).to_ident_native(None);
quote! { #ident: witx_gen::WasmValuePtr<#tp> }
});
let extra_results = (1..func.results.len()).map(|i| {
let ident = format!("ret_{}", i).to_ident_native(None);
let i = Index::from(i);
quote! {
#ident.write(ctx.memory(0), result.#i);
}
});
let result_return = match func.results.len() {
0 | 1 => quote! { result },
_ => quote! { result.0 },
};
quote! {
#name => witx_gen::reexports::func!({
let this = self.clone();
move |ctx: &mut witx_gen::reexports::Ctx, #( #params, )* #( #extra_params, )*| {
let result = this.#ident(ctx, #( #param_names ),*);
#( #extra_results )*
#result_return
}
})
}
});
quote! {
pub trait NativeWasiImports: Send + Sync + 'static {
#( #wasi_trait_functions )*
}
pub trait NativeWasiImportsExt {
fn into_imports(self) -> witx_gen::reexports::ImportObject;
}
impl<T: NativeWasiImports> NativeWasiImports for std::sync::Arc<T> {
#( #wasi_trait_impls_arc )*
}
impl<T: NativeWasiImports + Clone> NativeWasiImportsExt for T {
fn into_imports(self) -> witx_gen::reexports::ImportObject {
witx_gen::reexports::imports! {
#version => {
#( #wasi_trait_impls, )*
},
}
}
}
}
}