bjoernager/rust
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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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16
compiler/rustc_lint/src/builtin.rs
View file

@ -357,17 +357,15 @@ impl EarlyLintPass for UnsafeCode {
fn check_item(&mut self, cx: &EarlyContext<'_>, it: &ast::Item) {
match it.kind {
ast::ItemKind::Trait(_, ast::Unsafe::Yes(_), ..) => {
self.report_unsafe(cx, it.span, |lint| {
ast::ItemKind::Trait(box ast::TraitKind(_, ast::Unsafe::Yes(_), ..)) => self
.report_unsafe(cx, it.span, |lint| {
lint.build("declaration of an `unsafe` trait").emit()
})
}
}),
ast::ItemKind::Impl { unsafety: ast::Unsafe::Yes(_), .. } => {
self.report_unsafe(cx, it.span, |lint| {
ast::ItemKind::Impl(box ast::ImplKind { unsafety: ast::Unsafe::Yes(_), .. }) => self
.report_unsafe(cx, it.span, |lint| {
lint.build("implementation of an `unsafe` trait").emit()
})
}
}),
_ => {}
}
@ -872,7 +870,7 @@ declare_lint_pass!(
impl EarlyLintPass for AnonymousParameters {
fn check_trait_item(&mut self, cx: &EarlyContext<'_>, it: &ast::AssocItem) {
if let ast::AssocItemKind::Fn(_, ref sig, _, _) = it.kind {
if let ast::AssocItemKind::Fn(box FnKind(_, ref sig, _, _)) = it.kind {
for arg in sig.decl.inputs.iter() {
if let ast::PatKind::Ident(_, ident, None) = arg.pat.kind {
if ident.name == kw::Empty {

4
compiler/rustc_lint/src/internal.rs
View file

@ -2,7 +2,7 @@
//! Clippy.
use crate::{EarlyContext, EarlyLintPass, LateContext, LateLintPass, LintContext};
use rustc_ast::{Item, ItemKind};
use rustc_ast::{ImplKind, Item, ItemKind};
use rustc_data_structures::fx::FxHashMap;
use rustc_errors::Applicability;
use rustc_hir::def::Res;
@ -243,7 +243,7 @@ declare_lint_pass!(LintPassImpl => [LINT_PASS_IMPL_WITHOUT_MACRO]);
impl EarlyLintPass for LintPassImpl {
fn check_item(&mut self, cx: &EarlyContext<'_>, item: &Item) {
if let ItemKind::Impl { of_trait: Some(lint_pass), .. } = &item.kind {
if let ItemKind::Impl(box ImplKind { of_trait: Some(lint_pass), .. }) = &item.kind {
if let Some(last) = lint_pass.path.segments.last() {
if last.ident.name == sym::LintPass {
let expn_data = lint_pass.path.span.ctxt().outer_expn_data();

1
compiler/rustc_lint/src/lib.rs
View file

@ -30,6 +30,7 @@
#![feature(array_windows)]
#![feature(bool_to_option)]
#![feature(box_syntax)]
#![feature(box_patterns)]
#![feature(crate_visibility_modifier)]
#![feature(iter_order_by)]
#![feature(never_type)]