Function wiggle_generate::names::module

source · 
pub fn module(id: &Id) -> Ident
Expand description

Convert a module name from its Id name to its Rust Ident representation.

Examples found in repository?
src/wasmtime.rs (line 14)
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pub fn link_module(
    module: &witx::Module,
    target_path: Option<&syn::Path>,
    settings: &CodegenSettings,
) -> TokenStream {
    let module_ident = names::module(&module.name);

    let send_bound = if settings.async_.contains_async(module) {
        quote! { + Send, T: Send }
    } else {
        quote! {}
    };

    let mut bodies = Vec::new();
    let mut bounds = HashSet::new();
    for f in module.funcs() {
        let asyncness = settings.async_.get(module.name.as_str(), f.name.as_str());
        bodies.push(generate_func(&module, &f, target_path, asyncness));
        let bound = func_bounds(module, &f, settings);
        for b in bound {
            bounds.insert(b);
        }
    }

    let ctx_bound = if let Some(target_path) = target_path {
        let bounds = bounds
            .into_iter()
            .map(|b| quote!(#target_path::#module_ident::#b));
        quote!( #(#bounds)+* #send_bound )
    } else {
        let bounds = bounds.into_iter();
        quote!( #(#bounds)+* #send_bound )
    };

    let func_name = if target_path.is_none() {
        format_ident!("add_to_linker")
    } else {
        format_ident!("add_{}_to_linker", module_ident)
    };

    quote! {
        /// Adds all instance items to the specified `Linker`.
        pub fn #func_name<T, U>(
            linker: &mut wiggle::wasmtime_crate::Linker<T>,
            get_cx: impl Fn(&mut T) -> &mut U + Send + Sync + Copy + 'static,
        ) -> wiggle::anyhow::Result<()>
            where
                U: #ctx_bound #send_bound
        {
            #(#bodies)*
            Ok(())
        }
    }
}

fn generate_func(
    module: &witx::Module,
    func: &witx::InterfaceFunc,
    target_path: Option<&syn::Path>,
    asyncness: Asyncness,
) -> TokenStream {
    let module_str = module.name.as_str();
    let module_ident = names::module(&module.name);

    let field_str = func.name.as_str();
    let field_ident = names::func(&func.name);

    let (params, results) = func.wasm_signature();

    let arg_names = (0..params.len())
        .map(|i| Ident::new(&format!("arg{}", i), Span::call_site()))
        .collect::<Vec<_>>();
    let arg_decls = params
        .iter()
        .enumerate()
        .map(|(i, ty)| {
            let name = &arg_names[i];
            let wasm = names::wasm_type(*ty);
            quote! { #name: #wasm }
        })
        .collect::<Vec<_>>();

    let ret_ty = match results.len() {
        0 => quote!(()),
        1 => names::wasm_type(results[0]),
        _ => unimplemented!(),
    };

    let await_ = if asyncness.is_sync() {
        quote!()
    } else {
        quote!(.await)
    };

    let abi_func = if let Some(target_path) = target_path {
        quote!( #target_path::#module_ident::#field_ident )
    } else {
        quote!( #field_ident )
    };

    let body = quote! {
        let export = caller.get_export("memory");
        let (mem, ctx) = match &export {
            Some(wiggle::wasmtime_crate::Extern::Memory(m)) => {
                let (mem, ctx) = m.data_and_store_mut(&mut caller);
                let ctx = get_cx(ctx);
                (wiggle::wasmtime::WasmtimeGuestMemory::new(mem), ctx)
            }
            Some(wiggle::wasmtime_crate::Extern::SharedMemory(m)) => {
                let ctx = get_cx(caller.data_mut());
                (wiggle::wasmtime::WasmtimeGuestMemory::shared(m.data()), ctx)
            }
            _ => wiggle::anyhow::bail!("missing required memory export"),
        };
        Ok(<#ret_ty>::from(#abi_func(ctx, &mem #(, #arg_names)*) #await_ ?))
    };

    match asyncness {
        Asyncness::Async => {
            let wrapper = format_ident!("func_wrap{}_async", params.len());
            quote! {
                linker.#wrapper(
                    #module_str,
                    #field_str,
                    move |mut caller: wiggle::wasmtime_crate::Caller<'_, T> #(, #arg_decls)*| {
                        Box::new(async move { #body })
                    },
                )?;
            }
        }

        Asyncness::Blocking => {
            quote! {
                linker.func_wrap(
                    #module_str,
                    #field_str,
                    move |mut caller: wiggle::wasmtime_crate::Caller<'_, T> #(, #arg_decls)*| -> wiggle::anyhow::Result<#ret_ty> {
                        let result = async { #body };
                        wiggle::run_in_dummy_executor(result)?
                    },
                )?;
            }
        }

        Asyncness::Sync => {
            quote! {
                linker.func_wrap(
                    #module_str,
                    #field_str,
                    move |mut caller: wiggle::wasmtime_crate::Caller<'_, T> #(, #arg_decls)*| -> wiggle::anyhow::Result<#ret_ty> {
                        #body
                    },
                )?;
            }
        }
    }
}
More examples
Hide additional examples
src/lib.rs (line 57)
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pub fn generate(doc: &witx::Document, settings: &CodegenSettings) -> TokenStream {
    let types = doc
        .typenames()
        .map(|t| define_datatype(&t, settings.errors.for_name(&t)));

    let constants = doc.constants().map(|c| {
        let name = quote::format_ident!(
            "{}_{}",
            c.ty.as_str().to_shouty_snake_case(),
            c.name.as_str().to_shouty_snake_case()
        );
        let ty = names::type_(&c.ty);
        let value = Literal::u64_unsuffixed(c.value);
        quote! {
            pub const #name: #ty = #value;
        }
    });

    let user_error_methods = settings.errors.iter().filter_map(|errtype| match errtype {
        ErrorType::User(errtype) => {
            let abi_typename = names::type_ref(&errtype.abi_type(), anon_lifetime());
            let user_typename = errtype.typename();
            let methodname = names::user_error_conversion_method(&errtype);
            Some(quote! {
                fn #methodname(&mut self, e: super::#user_typename)
                    -> wiggle::anyhow::Result<#abi_typename>;
            })
        }
        ErrorType::Generated(_) => None,
    });
    let user_error_conversion = quote! {
        pub trait UserErrorConversion {
            #(#user_error_methods)*
        }
    };
    let modules = doc.modules().map(|module| {
        let modname = names::module(&module.name);
        let fs = module.funcs().map(|f| define_func(&module, &f, &settings));
        let modtrait = define_module_trait(&module, &settings);
        let wasmtime = if settings.wasmtime {
            crate::wasmtime::link_module(&module, None, &settings)
        } else {
            quote! {}
        };
        quote!(
            pub mod #modname {
                use super::types::*;
                pub use super::types::UserErrorConversion;
                #(#fs)*

                #modtrait

                #wasmtime
            }
        )
    });

    quote!(
        pub mod types {
            use std::convert::TryFrom;

            #(#types)*
            #(#constants)*
            #user_error_conversion
        }
        #(#modules)*
    )
}