bjoernager/rust
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Remove Session.used_attrs and move logic to CheckAttrVisitor

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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:
Aaron Hill 2021-07-29 12:00:41 -05:00
parent b6e334d873
commit af46699f81
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GPG key ID: B4087E510E98B164
62 changed files with 535 additions and 739 deletions
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4
compiler/rustc_incremental/src/assert_dep_graph.rs
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@ -123,7 +123,7 @@ impl IfThisChanged<'tcx> {
let def_path_hash = self.tcx.def_path_hash(def_id.to_def_id());
let attrs = self.tcx.hir().attrs(hir_id);
for attr in attrs {
if self.tcx.sess.check_name(attr, sym::rustc_if_this_changed) {
if attr.has_name(sym::rustc_if_this_changed) {
let dep_node_interned = self.argument(attr);
let dep_node = match dep_node_interned {
None => DepNode::from_def_path_hash(def_path_hash, DepKind::hir_owner),
@ -138,7 +138,7 @@ impl IfThisChanged<'tcx> {
},
};
self.if_this_changed.push((attr.span, def_id.to_def_id(), dep_node));
} else if self.tcx.sess.check_name(attr, sym::rustc_then_this_would_need) {
} else if attr.has_name(sym::rustc_then_this_would_need) {
let dep_node_interned = self.argument(attr);
let dep_node = match dep_node_interned {
Some(n) => match DepNode::from_label_string(&n.as_str(), def_path_hash) {