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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3
compiler/rustc_metadata/src/native_libs.rs
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@ -44,8 +44,7 @@ impl ItemLikeVisitor<'tcx> for Collector<'tcx> {
// Process all of the #[link(..)]-style arguments
let sess = &self.tcx.sess;
for m in self.tcx.hir().attrs(it.hir_id()).iter().filter(|a| sess.check_name(a, sym::link))
{
for m in self.tcx.hir().attrs(it.hir_id()).iter().filter(|a| a.has_name(sym::link)) {
let items = match m.meta_item_list() {
Some(item) => item,
None => continue,