rust-lang/rust
1
0
Fork 0
Code Issues Pull Requests Actions 1 Packages Projects Releases Wiki Activity

Auto merge of #87739 - Aaron1011:remove-used-attrs, r=wesleywiser

Browse Source 
Remove `Session.used_attrs` and move logic to `CheckAttrVisitor`

Instead of updating global state to mark attributes as used,
we now explicitly emit a warning when an attribute is used in
an unsupported position. As a side effect, we are to emit more
detailed warning messages (instead of just a generic "unused" message).

`Session.check_name` is removed, since its only purpose was to mark
the attribute as used. All of the callers are modified to use
`Attribute.has_name`

Additionally, `AttributeType::AssumedUsed` is removed - an 'assumed
used' attribute is implemented by simply not performing any checks
in `CheckAttrVisitor` for a particular attribute.

We no longer emit unused attribute warnings for the `#[rustc_dummy]`
attribute - it's an internal attribute used for tests, so it doesn't
mark sense to treat it as 'unused'.

With this commit, a large source of global untracked state is removed.
This commit is contained in:
bors
2021-08-24 03:58:22 +00:00
parent 5ca596f486 62aea8c913
commit f66e825f73
64 changed files with 1109 additions and 1598 deletions
Download Patch File Download Diff File Expand all files Collapse all files

17
compiler/rustc_resolve/src/lib.rs
View File

@@ -968,7 +968,7 @@ pub struct Resolver<'a> {
macro_map: FxHashMap<DefId, Lrc<SyntaxExtension>>,
dummy_ext_bang: Lrc<SyntaxExtension>,
dummy_ext_derive: Lrc<SyntaxExtension>,
non_macro_attrs: [Lrc<SyntaxExtension>; 2],
non_macro_attr: Lrc<SyntaxExtension>,
local_macro_def_scopes: FxHashMap<LocalDefId, Module<'a>>,
ast_transform_scopes: FxHashMap<LocalExpnId, Module<'a>>,
unused_macros: FxHashMap<LocalDefId, (NodeId, Span)>,
@@ -1293,8 +1293,6 @@ impl<'a> Resolver<'a> {
macros::registered_attrs_and_tools(session, &krate.attrs);
let features = session.features_untracked();
let non_macro_attr =
|mark_used| Lrc::new(SyntaxExtension::non_macro_attr(mark_used, session.edition()));
let mut resolver = Resolver {
session,
@@ -1361,7 +1359,7 @@ impl<'a> Resolver<'a> {
macro_map: FxHashMap::default(),
dummy_ext_bang: Lrc::new(SyntaxExtension::dummy_bang(session.edition())),
dummy_ext_derive: Lrc::new(SyntaxExtension::dummy_derive(session.edition())),
non_macro_attrs: [non_macro_attr(false), non_macro_attr(true)],
non_macro_attr: Lrc::new(SyntaxExtension::non_macro_attr(session.edition())),
invocation_parent_scopes: Default::default(),
output_macro_rules_scopes: Default::default(),
helper_attrs: Default::default(),
@@ -1476,15 +1474,11 @@ impl<'a> Resolver<'a> {
self.crate_loader.cstore()
}
fn non_macro_attr(&self, mark_used: bool) -> Lrc<SyntaxExtension> {
self.non_macro_attrs[mark_used as usize].clone()
}
fn dummy_ext(&self, macro_kind: MacroKind) -> Lrc<SyntaxExtension> {
match macro_kind {
MacroKind::Bang => self.dummy_ext_bang.clone(),
MacroKind::Derive => self.dummy_ext_derive.clone(),
MacroKind::Attr => self.non_macro_attr(true),
MacroKind::Attr => self.non_macro_attr.clone(),
}
}
@@ -3381,9 +3375,8 @@ impl<'a> Resolver<'a> {
let parse_attrs = || {
let attrs = self.cstore().item_attrs(def_id, self.session);
let attr = attrs
.iter()
.find(|a| self.session.check_name(a, sym::rustc_legacy_const_generics))?;
let attr =
attrs.iter().find(|a| a.has_name(sym::rustc_legacy_const_generics))?;
let mut ret = vec![];
for meta in attr.meta_item_list()? {
match meta.literal()?.kind {