bjoernager/rust
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Box the biggest ast::ItemKind variants

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This commit is contained in:
Dániel Buga 2021-01-29 08:31:08 +01:00
parent fee0d31397
commit b87e1ecdf0
34 changed files with 309 additions and 204 deletions
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44
compiler/rustc_ast_lowering/src/item.rs
View file

@ -67,7 +67,7 @@ impl<'a> Visitor<'a> for ItemLowerer<'a, '_, '_> {
if let Some(hir_id) = item_hir_id {
self.lctx.with_parent_item_lifetime_defs(hir_id, |this| {
let this = &mut ItemLowerer { lctx: this };
if let ItemKind::Impl { ref of_trait, .. } = item.kind {
if let ItemKind::Impl(box ImplKind { ref of_trait, .. }) = item.kind {
this.with_trait_impl_ref(of_trait, |this| visit::walk_item(this, item));
} else {
visit::walk_item(this, item);
@ -189,7 +189,9 @@ impl<'hir> LoweringContext<'_, 'hir> {
vec
}
ItemKind::MacroDef(..) => SmallVec::new(),
ItemKind::Fn(..) | ItemKind::Impl { of_trait: None, .. } => smallvec![i.id],
ItemKind::Fn(..) | ItemKind::Impl(box ImplKind { of_trait: None, .. }) => {
smallvec![i.id]
}
_ => smallvec![i.id],
};
@ -276,12 +278,12 @@ impl<'hir> LoweringContext<'_, 'hir> {
let (ty, body_id) = self.lower_const_item(t, span, e.as_deref());
hir::ItemKind::Const(ty, body_id)
}
ItemKind::Fn(
ItemKind::Fn(box FnKind(
_,
FnSig { ref decl, header, span: fn_sig_span },
ref generics,
ref body,
) => {
)) => {
let fn_def_id = self.resolver.local_def_id(id);
self.with_new_scopes(|this| {
this.current_item = Some(ident.span);
@ -329,7 +331,7 @@ impl<'hir> LoweringContext<'_, 'hir> {
}
}
ItemKind::GlobalAsm(ref ga) => hir::ItemKind::GlobalAsm(self.lower_global_asm(ga)),
ItemKind::TyAlias(_, ref gen, _, Some(ref ty)) => {
ItemKind::TyAlias(box TyAliasKind(_, ref gen, _, Some(ref ty))) => {
// We lower
//
// type Foo = impl Trait
@ -348,7 +350,7 @@ impl<'hir> LoweringContext<'_, 'hir> {
let generics = self.lower_generics(gen, ImplTraitContext::disallowed());
hir::ItemKind::TyAlias(ty, generics)
}
ItemKind::TyAlias(_, ref generics, _, None) => {
ItemKind::TyAlias(box TyAliasKind(_, ref generics, _, None)) => {
let ty = self.arena.alloc(self.ty(span, hir::TyKind::Err));
let generics = self.lower_generics(generics, ImplTraitContext::disallowed());
hir::ItemKind::TyAlias(ty, generics)
@ -375,7 +377,7 @@ impl<'hir> LoweringContext<'_, 'hir> {
self.lower_generics(generics, ImplTraitContext::disallowed()),
)
}
ItemKind::Impl {
ItemKind::Impl(box ImplKind {
unsafety,
polarity,
defaultness,
@ -384,7 +386,7 @@ impl<'hir> LoweringContext<'_, 'hir> {
of_trait: ref trait_ref,
self_ty: ref ty,
items: ref impl_items,
} => {
}) => {
let def_id = self.resolver.local_def_id(id);
// Lower the "impl header" first. This ordering is important
@ -448,7 +450,13 @@ impl<'hir> LoweringContext<'_, 'hir> {
items: new_impl_items,
})
}
ItemKind::Trait(is_auto, unsafety, ref generics, ref bounds, ref items) => {
ItemKind::Trait(box TraitKind(
is_auto,
unsafety,
ref generics,
ref bounds,
ref items,
)) => {
let bounds = self.lower_param_bounds(bounds, ImplTraitContext::disallowed());
let items = self
.arena
@ -698,7 +706,7 @@ impl<'hir> LoweringContext<'_, 'hir> {
ident: i.ident,
attrs: self.lower_attrs(&i.attrs),
kind: match i.kind {
ForeignItemKind::Fn(_, ref sig, ref generics, _) => {
ForeignItemKind::Fn(box FnKind(_, ref sig, ref generics, _)) => {
let fdec = &sig.decl;
let (generics, (fn_dec, fn_args)) = self.add_in_band_defs(
generics,
@ -803,19 +811,19 @@ impl<'hir> LoweringContext<'_, 'hir> {
let body = default.as_ref().map(|x| self.lower_const_body(i.span, Some(x)));
(hir::Generics::empty(), hir::TraitItemKind::Const(ty, body))
}
AssocItemKind::Fn(_, ref sig, ref generics, None) => {
AssocItemKind::Fn(box FnKind(_, ref sig, ref generics, None)) => {
let names = self.lower_fn_params_to_names(&sig.decl);
let (generics, sig) =
self.lower_method_sig(generics, sig, trait_item_def_id, false, None, i.id);
(generics, hir::TraitItemKind::Fn(sig, hir::TraitFn::Required(names)))
}
AssocItemKind::Fn(_, ref sig, ref generics, Some(ref body)) => {
AssocItemKind::Fn(box FnKind(_, ref sig, ref generics, Some(ref body))) => {
let body_id = self.lower_fn_body_block(i.span, &sig.decl, Some(body));
let (generics, sig) =
self.lower_method_sig(generics, sig, trait_item_def_id, false, None, i.id);
(generics, hir::TraitItemKind::Fn(sig, hir::TraitFn::Provided(body_id)))
}
AssocItemKind::TyAlias(_, ref generics, ref bounds, ref default) => {
AssocItemKind::TyAlias(box TyAliasKind(_, ref generics, ref bounds, ref default)) => {
let ty = default.as_ref().map(|x| self.lower_ty(x, ImplTraitContext::disallowed()));
let generics = self.lower_generics(generics, ImplTraitContext::disallowed());
let kind = hir::TraitItemKind::Type(
@ -841,10 +849,10 @@ impl<'hir> LoweringContext<'_, 'hir> {
fn lower_trait_item_ref(&mut self, i: &AssocItem) -> hir::TraitItemRef {
let (kind, has_default) = match &i.kind {
AssocItemKind::Const(_, _, default) => (hir::AssocItemKind::Const, default.is_some()),
AssocItemKind::TyAlias(_, _, _, default) => {
AssocItemKind::TyAlias(box TyAliasKind(_, _, _, default)) => {
(hir::AssocItemKind::Type, default.is_some())
}
AssocItemKind::Fn(_, sig, _, default) => {
AssocItemKind::Fn(box FnKind(_, sig, _, default)) => {
(hir::AssocItemKind::Fn { has_self: sig.decl.has_self() }, default.is_some())
}
AssocItemKind::MacCall(..) => unimplemented!(),
@ -870,7 +878,7 @@ impl<'hir> LoweringContext<'_, 'hir> {
hir::ImplItemKind::Const(ty, self.lower_const_body(i.span, expr.as_deref())),
)
}
AssocItemKind::Fn(_, sig, generics, body) => {
AssocItemKind::Fn(box FnKind(_, sig, generics, body)) => {
self.current_item = Some(i.span);
let asyncness = sig.header.asyncness;
let body_id =
@ -887,7 +895,7 @@ impl<'hir> LoweringContext<'_, 'hir> {
(generics, hir::ImplItemKind::Fn(sig, body_id))
}
AssocItemKind::TyAlias(_, generics, _, ty) => {
AssocItemKind::TyAlias(box TyAliasKind(_, generics, _, ty)) => {
let generics = self.lower_generics(generics, ImplTraitContext::disallowed());
let kind = match ty {
None => {
@ -938,7 +946,7 @@ impl<'hir> LoweringContext<'_, 'hir> {
kind: match &i.kind {
AssocItemKind::Const(..) => hir::AssocItemKind::Const,
AssocItemKind::TyAlias(..) => hir::AssocItemKind::Type,
AssocItemKind::Fn(_, sig, ..) => {
AssocItemKind::Fn(box FnKind(_, sig, ..)) => {
hir::AssocItemKind::Fn { has_self: sig.decl.has_self() }
}
AssocItemKind::MacCall(..) => unimplemented!(),

5
compiler/rustc_ast_lowering/src/lib.rs
View file

@ -32,6 +32,7 @@
#![feature(crate_visibility_modifier)]
#![feature(or_patterns)]
#![feature(box_patterns)]
#![recursion_limit = "256"]
use rustc_ast::node_id::NodeMap;
@ -500,8 +501,8 @@ impl<'a, 'hir> LoweringContext<'a, 'hir> {
ItemKind::Struct(_, ref generics)
| ItemKind::Union(_, ref generics)
| ItemKind::Enum(_, ref generics)
| ItemKind::TyAlias(_, ref generics, ..)
| ItemKind::Trait(_, _, ref generics, ..) => {
| ItemKind::TyAlias(box TyAliasKind(_, ref generics, ..))
| ItemKind::Trait(box TraitKind(_, _, ref generics, ..)) => {
let def_id = self.lctx.resolver.local_def_id(item.id);
let count = generics
.params