/
structs.rs
306 lines (267 loc) · 8.7 KB
/
structs.rs
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use super::*;
pub fn gen(def: &TypeDef, gen: &Gen) -> TokenStream {
if def.is_api_contract() {
return quote! {};
}
if !gen.sys {
if let Some(replacement) = replacements::gen(def) {
return replacement;
}
}
if def.is_handle() {
return handles::gen(def, gen);
}
gen_struct_with_name(def, def.name(), &Cfg::new(), gen)
}
fn gen_struct_with_name(def: &TypeDef, struct_name: &str, cfg: &Cfg, gen: &Gen) -> TokenStream {
let name = gen_ident(struct_name);
if def.fields().next().is_none() {
if let Some(guid) = GUID::from_attributes(def.attributes()) {
let value = gen_guid(&guid, gen);
let guid = gen_element_name(&ElementType::GUID, gen);
return quote! { pub const #name: #guid = #value; };
} else if name.as_str().ends_with("Vtbl") {
return quote! {};
} else {
return quote! {
#[repr(C)]
pub struct #name(pub u8);
};
}
}
let is_union = def.is_union();
let cfg = cfg.union(gen.type_cfg(def));
let repr = if let Some(layout) = def.class_layout() {
let packing = Literal::u32_unsuffixed(layout.packing_size());
quote! { #[repr(C, packed(#packing))] }
} else {
quote! { #[repr(C)] }
};
let fields = def.fields().map(|f| {
let name = gen_ident(f.name());
let sig = gen_sig(&f.signature(Some(def)), gen);
if f.is_literal() {
quote! {}
} else if !gen.sys && is_union && !f.is_blittable(Some(def)) {
quote! { pub #name: ::core::mem::ManuallyDrop<#sig>, }
} else {
quote! { pub #name: #sig, }
}
});
let struct_or_union = if is_union {
quote! { union }
} else {
quote! { struct }
};
let features = cfg.gen(gen);
let doc = cfg.gen_doc(gen);
let mut tokens = quote! {
#repr
#doc
#features
pub #struct_or_union #name {#(#fields)*}
};
tokens.combine(&gen_struct_constants(def, &name, &cfg, gen));
tokens.combine(&gen_copy_clone(def, &name, &cfg, gen));
tokens.combine(&gen_debug(def, &name, &cfg, gen));
tokens.combine(&gen_windows_traits(def, &name, &cfg, gen));
tokens.combine(&gen_compare_traits(def, &name, &cfg, gen));
if !gen.sys {
tokens.combine("e! {
#features
impl ::core::default::Default for #name {
fn default() -> Self {
unsafe { ::core::mem::zeroed() }
}
}
});
tokens.combine(&extensions::gen(def));
}
if let Some(nested_types) = def.nested_types() {
for (index, (_, nested_type)) in nested_types.iter().enumerate() {
let nested_name = format!("{}_{}", struct_name, index);
tokens.combine(&gen_struct_with_name(nested_type, &nested_name, &cfg, gen));
}
}
tokens
}
fn gen_windows_traits(def: &TypeDef, name: &TokenStream, cfg: &Cfg, gen: &Gen) -> TokenStream {
if gen.sys {
quote! {}
} else {
let abi = if def.is_blittable() {
quote! { Self }
} else {
quote! { ::core::mem::ManuallyDrop<Self> }
};
let cfg = cfg.gen(gen);
let mut tokens = quote! {
#cfg
unsafe impl ::windows::core::Abi for #name {
type Abi = #abi;
}
};
if def.is_winrt() {
let signature = Literal::byte_string(def.type_signature().as_bytes());
tokens.combine("e! {
#cfg
unsafe impl ::windows::core::RuntimeType for #name {
const SIGNATURE: ::windows::core::ConstBuffer = ::windows::core::ConstBuffer::from_slice(#signature);
}
#cfg
impl ::windows::core::DefaultType for #name {
type DefaultType = Self;
}
});
}
tokens
}
}
fn gen_compare_traits(def: &TypeDef, name: &TokenStream, cfg: &Cfg, gen: &Gen) -> TokenStream {
let cfg = cfg.gen(gen);
if gen.sys {
quote! {}
} else if def.is_blittable() || def.is_union() || def.class_layout().is_some() {
quote! {
#cfg
impl ::core::cmp::PartialEq for #name {
fn eq(&self, other: &Self) -> bool {
unsafe {
::windows::core::memcmp(self as *const _ as _, other as *const _ as _, core::mem::size_of::<#name>()) == 0
}
}
}
#cfg
impl ::core::cmp::Eq for #name {}
}
} else {
let fields = def.fields().map(|f| {
let name = gen_ident(f.name());
if f.is_literal() {
quote! {}
} else {
let sig = f.signature(Some(def));
if sig.kind.is_callback() {
quote! {
self.#name.map(|f| f as usize) == other.#name.map(|f| f as usize)
}
} else {
quote! { self.#name == other.#name }
}
}
});
quote! {
#cfg
impl ::core::cmp::PartialEq for #name {
fn eq(&self, other: &Self) -> bool {
#(#fields)&&*
}
}
#cfg
impl ::core::cmp::Eq for #name {}
}
}
}
fn gen_debug(def: &TypeDef, ident: &TokenStream, cfg: &Cfg, gen: &Gen) -> TokenStream {
if gen.sys || def.is_union() || def.has_explicit() || def.is_packed() {
quote! {}
} else {
let name = ident.as_str();
let cfg = cfg.gen(gen);
let fields = def.fields().map(|f| {
if f.is_literal() {
quote! {}
} else {
let name = f.name();
let ident = gen_ident(name);
let signature = f.signature(Some(def));
if signature.is_callback() {
quote! { .field(#name, &self.#ident.map(|f| f as usize)) }
} else if signature.is_callback_array() {
quote! {}
} else {
quote! { .field(#name, &self.#ident) }
}
}
});
quote! {
#cfg
impl ::core::fmt::Debug for #ident {
fn fmt(&self, f: &mut ::core::fmt::Formatter<'_>) -> ::core::fmt::Result {
f.debug_struct(#name) #(#fields)* .finish()
}
}
}
}
}
fn gen_copy_clone(def: &TypeDef, name: &TokenStream, cfg: &Cfg, gen: &Gen) -> TokenStream {
let cfg = cfg.gen(gen);
if gen.sys || def.is_blittable() {
quote! {
#cfg
impl ::core::marker::Copy for #name {}
#cfg
impl ::core::clone::Clone for #name {
fn clone(&self) -> Self {
*self
}
}
}
} else if def.is_union() {
quote! {
#cfg
impl ::core::clone::Clone for #name {
fn clone(&self) -> Self {
unsafe { ::core::mem::transmute_copy(self) }
}
}
}
} else if def.class_layout().is_some() {
// Don't support copy/clone of packed structs: https://github.com/rust-lang/rust/issues/82523
quote! {}
} else {
let fields = def.fields().map(|f| {
let name = gen_ident(f.name());
if f.is_literal() {
quote! {}
} else if f.is_blittable(Some(def)) {
quote! { #name: self.#name }
} else {
quote! { #name: self.#name.clone() }
}
});
quote! {
#cfg
impl ::core::clone::Clone for #name {
fn clone(&self) -> Self {
Self { #(#fields),* }
}
}
}
}
}
fn gen_struct_constants(def: &TypeDef, struct_name: &TokenStream, cfg: &Cfg, gen: &Gen) -> TokenStream {
let cfg = cfg.gen(gen);
let constants = def.fields().filter_map(|f| {
if f.is_literal() {
if let Some(constant) = f.constant() {
let name = gen_ident(f.name());
let value = gen_constant_type_value(&constant.value());
return Some(quote! {
pub const #name: #value;
});
}
}
None
});
let mut tokens = quote! { #(#constants)* };
if !tokens.is_empty() {
tokens = quote! {
#cfg
impl #struct_name {
#tokens
}
};
}
tokens
}