Function wiggle_generate::names::wasm_type

source · 
pub fn wasm_type(ty: WasmType) -> TokenStream
Examples found in repository?
src/types/flags.rs (line 12)
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pub(super) fn define_flags(
    name: &witx::Id,
    repr: witx::IntRepr,
    record: &witx::RecordDatatype,
) -> TokenStream {
    let ident = names::type_(&name);
    let abi_repr = names::wasm_type(repr.into());
    let repr = super::int_repr_tokens(repr);

    let mut names_ = vec![];
    let mut values_ = vec![];
    for (i, member) in record.members.iter().enumerate() {
        let name = names::flag_member(&member.name);
        let value_token = Literal::usize_unsuffixed(1 << i);
        names_.push(name);
        values_.push(value_token);
    }

    quote! {
        wiggle::bitflags::bitflags! {
            pub struct #ident: #repr {
                #(const #names_ = #values_;)*
            }
        }

        impl ::std::fmt::Display for #ident {
            fn fmt(&self, f: &mut ::std::fmt::Formatter<'_>) -> ::std::fmt::Result {
                f.write_str(stringify!(#ident))?;
                f.write_str("(")?;
                ::std::fmt::Debug::fmt(self, f)?;
                f.write_str(" (0x")?;
                ::std::fmt::LowerHex::fmt(&self.bits, f)?;
                f.write_str("))")?;
                Ok(())
            }
        }

        impl TryFrom<#repr> for #ident {
            type Error = wiggle::GuestError;
            fn try_from(value: #repr) -> Result<Self, wiggle::GuestError> {
                if #repr::from(!#ident::all()) & value != 0 {
                    Err(wiggle::GuestError::InvalidFlagValue(stringify!(#ident)))
                } else {
                    Ok(#ident { bits: value })
                }
            }
        }

        impl TryFrom<#abi_repr> for #ident {
            type Error = wiggle::GuestError;
            fn try_from(value: #abi_repr) -> Result<Self, wiggle::GuestError> {
                #ident::try_from(#repr::try_from(value)?)
            }
        }

        impl From<#ident> for #repr {
            fn from(e: #ident) -> #repr {
                e.bits
            }
        }

        impl<'a> wiggle::GuestType<'a> for #ident {
            fn guest_size() -> u32 {
                #repr::guest_size()
            }

            fn guest_align() -> usize {
                #repr::guest_align()
            }

            fn read(location: &wiggle::GuestPtr<#ident>) -> Result<#ident, wiggle::GuestError> {
                use std::convert::TryFrom;
                let reprval = #repr::read(&location.cast())?;
                let value = #ident::try_from(reprval)?;
                Ok(value)
            }

            fn write(location: &wiggle::GuestPtr<'_, #ident>, val: Self) -> Result<(), wiggle::GuestError> {
                let val: #repr = #repr::from(val);
                #repr::write(&location.cast(), val)
            }
        }
    }
}
More examples
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src/wasmtime.rs (line 86)
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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
                    },
                )?;
            }
        }
    }
}
src/funcs.rs (line 41)
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fn _define_func(
    module: &witx::Module,
    func: &witx::InterfaceFunc,
    settings: &CodegenSettings,
) -> (TokenStream, Vec<Ident>) {
    let ident = names::func(&func.name);

    let (wasm_params, wasm_results) = func.wasm_signature();
    let param_names = (0..wasm_params.len())
        .map(|i| Ident::new(&format!("arg{}", i), Span::call_site()))
        .collect::<Vec<_>>();
    let abi_params = wasm_params.iter().zip(&param_names).map(|(arg, name)| {
        let wasm = names::wasm_type(*arg);
        quote!(#name : #wasm)
    });

    let abi_ret = match wasm_results.len() {
        0 => quote!(()),
        1 => {
            let ty = names::wasm_type(wasm_results[0]);
            quote!(#ty)
        }
        _ => unimplemented!(),
    };

    let mut body = TokenStream::new();
    let mut bounds = vec![names::trait_name(&module.name)];
    func.call_interface(
        &module.name,
        &mut Rust {
            src: &mut body,
            params: &param_names,
            block_storage: Vec::new(),
            blocks: Vec::new(),
            module,
            funcname: func.name.as_str(),
            settings,
            bounds: &mut bounds,
        },
    );

    let mod_name = &module.name.as_str();
    let func_name = &func.name.as_str();
    let mk_span = quote!(
        let _span = wiggle::tracing::span!(
            wiggle::tracing::Level::TRACE,
            "wiggle abi",
            module = #mod_name,
            function = #func_name
        );
    );
    if settings.get_async(&module, &func).is_sync() {
        let traced_body = if settings.tracing.enabled_for(&mod_name, &func_name) {
            quote!(
                #mk_span
                _span.in_scope(|| {
                  #body
                })
            )
        } else {
            quote!(#body)
        };
        (
            quote!(
                #[allow(unreachable_code)] // deals with warnings in noreturn functions
                pub fn #ident(
                    ctx: &mut (impl #(#bounds)+*),
                    memory: &dyn wiggle::GuestMemory,
                    #(#abi_params),*
                ) -> wiggle::anyhow::Result<#abi_ret> {
                    use std::convert::TryFrom as _;
                    #traced_body
                }
            ),
            bounds,
        )
    } else {
        let traced_body = if settings.tracing.enabled_for(&mod_name, &func_name) {
            quote!(
                use wiggle::tracing::Instrument as _;
                #mk_span
                async move {
                    #body
                }.instrument(_span)
            )
        } else {
            quote!(
                async move {
                    #body
                }
            )
        };
        (
            quote!(
                #[allow(unreachable_code)] // deals with warnings in noreturn functions
                pub fn #ident<'a>(
                    ctx: &'a mut (impl #(#bounds)+*),
                    memory: &'a dyn wiggle::GuestMemory,
                    #(#abi_params),*
                ) -> impl std::future::Future<Output = wiggle::anyhow::Result<#abi_ret>> + 'a {
                    use std::convert::TryFrom as _;
                    #traced_body
                }
            ),
            bounds,
        )
    }
}
src/types/variant.rs (line 78)
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pub(super) fn define_variant(
    name: &witx::Id,
    v: &witx::Variant,
    derive_std_error: bool,
) -> TokenStream {
    let ident = names::type_(name);
    let size = v.mem_size_align().size as u32;
    let align = v.mem_size_align().align as usize;
    let contents_offset = v.payload_offset() as u32;

    let lifetime = quote!('a);
    let tag_ty = super::int_repr_tokens(v.tag_repr);

    let variants = v.cases.iter().map(|c| {
        let var_name = names::enum_variant(&c.name);
        if let Some(tref) = &c.tref {
            let var_type = names::type_ref(&tref, lifetime.clone());
            quote!(#var_name(#var_type))
        } else {
            quote!(#var_name)
        }
    });

    let read_variant = v.cases.iter().enumerate().map(|(i, c)| {
        let i = Literal::usize_unsuffixed(i);
        let variantname = names::enum_variant(&c.name);
        if let Some(tref) = &c.tref {
            let varianttype = names::type_ref(tref, lifetime.clone());
            quote! {
                #i => {
                    let variant_ptr = location.cast::<u8>().add(#contents_offset)?;
                    let variant_val = <#varianttype as wiggle::GuestType>::read(&variant_ptr.cast())?;
                    Ok(#ident::#variantname(variant_val))
                }
            }
        } else {
            quote! { #i => Ok(#ident::#variantname), }
        }
    });

    let write_variant = v.cases.iter().enumerate().map(|(i, c)| {
        let variantname = names::enum_variant(&c.name);
        let write_tag = quote! {
            location.cast().write(#i as #tag_ty)?;
        };
        if let Some(tref) = &c.tref {
            let varianttype = names::type_ref(tref, lifetime.clone());
            quote! {
                #ident::#variantname(contents) => {
                    #write_tag
                    let variant_ptr = location.cast::<u8>().add(#contents_offset)?;
                    <#varianttype as wiggle::GuestType>::write(&variant_ptr.cast(), contents)?;
                }
            }
        } else {
            quote! {
                #ident::#variantname => {
                    #write_tag
                }
            }
        }
    });

    let mut extra_derive = quote!();
    let enum_try_from = if v.cases.iter().all(|c| c.tref.is_none()) {
        let tryfrom_repr_cases = v.cases.iter().enumerate().map(|(i, c)| {
            let variant_name = names::enum_variant(&c.name);
            let n = Literal::usize_unsuffixed(i);
            quote!(#n => Ok(#ident::#variant_name))
        });
        let abi_ty = names::wasm_type(v.tag_repr.into());
        extra_derive = quote!(, Copy);
        quote! {
            impl TryFrom<#tag_ty> for #ident {
                type Error = wiggle::GuestError;
                fn try_from(value: #tag_ty) -> Result<#ident, wiggle::GuestError> {
                    match value {
                        #(#tryfrom_repr_cases),*,
                        _ => Err(wiggle::GuestError::InvalidEnumValue(stringify!(#ident))),
                    }
                }
            }

            impl TryFrom<#abi_ty> for #ident {
                type Error = wiggle::GuestError;
                fn try_from(value: #abi_ty) -> Result<#ident, wiggle::GuestError> {
                    #ident::try_from(#tag_ty::try_from(value)?)
                }
            }
        }
    } else {
        quote!()
    };

    let enum_from = if v.cases.iter().all(|c| c.tref.is_none()) {
        let from_repr_cases = v.cases.iter().enumerate().map(|(i, c)| {
            let variant_name = names::enum_variant(&c.name);
            let n = Literal::usize_unsuffixed(i);
            quote!(#ident::#variant_name => #n)
        });
        quote! {
            impl From<#ident> for #tag_ty {
                fn from(v: #ident) -> #tag_ty {
                    match v {
                        #(#from_repr_cases),*,
                    }
                }
            }
        }
    } else {
        quote!()
    };

    let (enum_lifetime, extra_derive) = if v.needs_lifetime() {
        (quote!(<'a>), quote!())
    } else {
        (quote!(), quote!(, PartialEq #extra_derive))
    };

    let error_impls = if derive_std_error {
        quote! {
            impl std::fmt::Display for #ident {
                fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
                    write!(f, "{:?}", self)
                }
            }
            impl std::error::Error for #ident {}
        }
    } else {
        quote!()
    };

    quote! {
        #[derive(Clone, Debug #extra_derive)]
        pub enum #ident #enum_lifetime {
            #(#variants),*
        }
        #error_impls

        #enum_try_from
        #enum_from

        impl<'a> wiggle::GuestType<'a> for #ident #enum_lifetime {
            fn guest_size() -> u32 {
                #size
            }

            fn guest_align() -> usize {
                #align
            }

            fn read(location: &wiggle::GuestPtr<'a, Self>)
                -> Result<Self, wiggle::GuestError>
            {
                let tag = location.cast::<#tag_ty>().read()?;
                match tag {
                    #(#read_variant)*
                    _ => Err(wiggle::GuestError::InvalidEnumValue(stringify!(#ident))),
                }

            }

            fn write(location: &wiggle::GuestPtr<'_, Self>, val: Self)
                -> Result<(), wiggle::GuestError>
            {
                match val {
                    #(#write_variant)*
                }
                Ok(())
            }
        }
    }
}