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|
use super::*;
pub fn writer(writer: &Writer, def: TypeDef) -> TokenStream {
if def.kind() != TypeKind::Interface || (!writer.implement && def.has_attribute("ExclusiveToAttribute")) {
return quote! {};
}
let generics = &type_def_generics(def);
let type_ident = to_ident(def.name());
let impl_ident = type_ident.join("_Impl");
let vtbl_ident = type_ident.join("_Vtbl");
let implvtbl_ident = impl_ident.join("Vtbl");
let constraints = writer.generic_constraints(generics);
let generic_names = writer.generic_names(generics);
let named_phantoms = writer.generic_named_phantoms(generics);
let cfg = type_def_cfg_impl(def, generics);
let doc = writer.cfg_doc(&cfg);
let features = writer.cfg_features(&cfg);
let mut requires = quote! {};
let type_ident = quote! { #type_ident<#generic_names> };
let vtables = type_def_vtables(def);
let has_unknown_base = matches!(vtables.first(), Some(Type::IUnknown));
fn gen_required_trait(writer: &Writer, def: TypeDef, generics: &[Type]) -> TokenStream {
let name = writer.type_def_name_imp(def, generics, "_Impl");
quote! {
+ #name
}
}
let mut matches = quote! { *iid == <#type_ident as ::windows_core::ComInterface>::IID };
if let Some(Type::TypeDef(def, _)) = vtables.last() {
requires.combine(&gen_required_trait(writer, *def, &[]))
}
for def in &vtables {
if let Type::TypeDef(def, generics) = def {
let name = writer.type_def_name(*def, generics);
matches.combine("e! {
|| *iid == <#name as ::windows_core::ComInterface>::IID
})
}
}
if def.flags().contains(TypeAttributes::WindowsRuntime) {
// TODO: this awkward wrapping of TypeDefs needs fixing
for interface in type_interfaces(&Type::TypeDef(def, generics.to_vec())) {
if let Type::TypeDef(def, generics) = interface.ty {
requires.combine(&gen_required_trait(writer, def, &generics));
}
}
}
let runtime_name = writer.runtime_name_trait(def, generics, &type_ident, &constraints, &features);
let mut method_names = MethodNames::new();
method_names.add_vtable_types(def);
let method_traits = def.methods().map(|method| {
let name = method_names.add(method);
let signature = method_def_signature(def.namespace(), method, generics);
let signature_tokens = writer.impl_signature(def, &signature);
quote! { fn #name #signature_tokens; }
});
let mut method_names = MethodNames::new();
method_names.add_vtable_types(def);
let method_impls = def.methods().map(|method| {
let name = method_names.add(method);
let signature = method_def_signature(def.namespace(), method, generics);
let vtbl_signature = writer.vtbl_signature(def, generics, &signature);
let invoke_upcall = if def.flags().contains(TypeAttributes::WindowsRuntime) { winrt_methods::gen_upcall(writer, &signature, quote! { this.#name }) } else { com_methods::gen_upcall(writer, &signature, quote! { this.#name }) };
if has_unknown_base {
quote! {
unsafe extern "system" fn #name<#constraints Identity: ::windows_core::IUnknownImpl<Impl = Impl>, Impl: #impl_ident<#generic_names>, const OFFSET: isize> #vtbl_signature {
// offset the `this` pointer by `OFFSET` times the size of a pointer and cast it as an IUnknown implementation
let this = (this as *const *const ()).offset(OFFSET) as *const Identity;
let this = (*this).get_impl();
#invoke_upcall
}
}
} else {
quote! {
unsafe extern "system" fn #name<Impl: #impl_ident> #vtbl_signature {
let this = (this as *mut *mut ::core::ffi::c_void) as *const ::windows_core::ScopedHeap;
let this = &*((*this).this as *const Impl);
#invoke_upcall
}
}
}
});
let mut methods = quote! {};
match vtables.last() {
Some(Type::IUnknown) => methods.combine("e! { base__: ::windows_core::IUnknown_Vtbl::new::<Identity, OFFSET>(), }),
Some(Type::IInspectable) => methods.combine("e! { base__: ::windows_core::IInspectable_Vtbl::new::<Identity, #type_ident, OFFSET>(), }),
Some(Type::TypeDef(def, generics)) => {
let name = writer.type_def_name_imp(*def, generics, "_Vtbl");
if has_unknown_base {
methods.combine("e! { base__: #name::new::<Identity, Impl, OFFSET>(), });
} else {
methods.combine("e! { base__: #name::new::<Impl>(), });
}
}
_ => {}
}
let mut method_names = MethodNames::new();
method_names.add_vtable_types(def);
for method in def.methods() {
let name = method_names.add(method);
if has_unknown_base {
methods.combine("e! { #name: #name::<#generic_names Identity, Impl, OFFSET>, });
} else {
methods.combine("e! { #name: #name::<Impl>, });
}
}
if has_unknown_base {
quote! {
#doc
#features
pub trait #impl_ident<#generic_names> : Sized #requires where #constraints {
#(#method_traits)*
}
#runtime_name
#features
impl<#constraints> #vtbl_ident<#generic_names> {
pub const fn new<Identity: ::windows_core::IUnknownImpl<Impl = Impl>, Impl: #impl_ident<#generic_names>, const OFFSET: isize>() -> #vtbl_ident<#generic_names> {
#(#method_impls)*
Self{
#methods
#(#named_phantoms)*
}
}
pub unsafe fn matches(iid: *const ::windows_core::GUID) -> bool {
#matches
}
}
}
} else {
quote! {
#doc
#features
pub trait #impl_ident : Sized #requires {
#(#method_traits)*
}
#features
impl #vtbl_ident {
pub const fn new<Impl: #impl_ident>() -> #vtbl_ident {
#(#method_impls)*
Self{
#methods
#(#named_phantoms)*
}
}
}
#[doc(hidden)]
#features
struct #implvtbl_ident<T: #impl_ident> (::std::marker::PhantomData<T>);
#features
impl<T: #impl_ident> #implvtbl_ident<T> {
const VTABLE: #vtbl_ident = #vtbl_ident::new::<T>();
}
#features
impl #type_ident {
pub fn new<'a, T: #impl_ident>(this: &'a T) -> ::windows_core::ScopedInterface<'a, Self> {
let this = ::windows_core::ScopedHeap { vtable: &#implvtbl_ident::<T>::VTABLE as *const _ as *const _, this: this as *const _ as *const _ };
let this = ::std::mem::ManuallyDrop::new(::std::boxed::Box::new(this));
unsafe { ::windows_core::ScopedInterface::new(::std::mem::transmute(&this.vtable)) }
}
}
}
}
}
|
