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Auto merge of #81405 - bugadani:ast, r=cjgillot

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Box the biggest ast::ItemKind variants

This PR is a different approach on https://github.com/rust-lang/rust/pull/81400, aiming to save memory in humongous ASTs.

The three affected item kind enums are:
 - `ast::ItemKind` (208 -> 112 bytes)
 - `ast::AssocItemKind` (176 -> 72 bytes)
 - `ast::ForeignItemKind` (176 -> 72 bytes)
This commit is contained in:
bors 2021-02-02 17:34:08 +00:00
commit 3182375e06
34 changed files with 319 additions and 204 deletions
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10
compiler/rustc_builtin_macros/src/deriving/generic/mod.rs
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@ -527,12 +527,12 @@ impl<'a> TraitDef<'a> {
tokens: None,
},
attrs: Vec::new(),
kind: ast::AssocItemKind::TyAlias(
kind: ast::AssocItemKind::TyAlias(box ast::TyAliasKind(
ast::Defaultness::Final,
Generics::default(),
Vec::new(),
Some(type_def.to_ty(cx, self.span, type_ident, generics)),
),
)),
tokens: None,
})
});
@ -687,7 +687,7 @@ impl<'a> TraitDef<'a> {
self.span,
Ident::invalid(),
a,
ast::ItemKind::Impl {
ast::ItemKind::Impl(box ast::ImplKind {
unsafety,
polarity: ast::ImplPolarity::Positive,
defaultness: ast::Defaultness::Final,
@ -696,7 +696,7 @@ impl<'a> TraitDef<'a> {
of_trait: opt_trait_ref,
self_ty: self_type,
items: methods.into_iter().chain(associated_types).collect(),
},
}),
)
}
@ -929,7 +929,7 @@ impl<'a> MethodDef<'a> {
tokens: None,
},
ident: method_ident,
kind: ast::AssocItemKind::Fn(def, sig, fn_generics, Some(body_block)),
kind: ast::AssocItemKind::Fn(box ast::FnKind(def, sig, fn_generics, Some(body_block))),
tokens: None,
})
}