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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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5
compiler/rustc_ast_lowering/src/lib.rs
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@ -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