Auto merge of #142921 - JonathanBrouwer:rustc_attributes_parser, r=oli-obk

Port `#[rustc_layout_scalar_valid_range_start/end]` to the new attrib…

Ports `rustc_layout_scalar_valid_range_start` and `rustc_layout_scalar_valid_range_end` to the new attribute parsing infrastructure for https://github.com/rust-lang/rust/issues/131229#issuecomment-2971353197

r? `@jdonszelmann`

1 files changed, 4 insertions, 26 deletions

diff --git a/compiler/rustc_middle/src/ty/context.rs b/compiler/rustc_middle/src/ty/context.rs
index 457a4f4d502..72810491214 100644
--- a/compiler/rustc_middle/src/ty/context.rs
+++ b/compiler/rustc_middle/src/ty/context.rs
@@ -17,6 +17,7 @@ use std::{fmt, iter, mem};
 
 use rustc_abi::{ExternAbi, FieldIdx, Layout, LayoutData, TargetDataLayout, VariantIdx};
 use rustc_ast as ast;
+use rustc_attr_data_structures::{AttributeKind, find_attr};
 use rustc_data_structures::defer;
 use rustc_data_structures::fingerprint::Fingerprint;
 use rustc_data_structures::fx::FxHashMap;
@@ -1648,32 +1649,9 @@ impl<'tcx> TyCtxt<'tcx> {
     /// `rustc_layout_scalar_valid_range` attribute.
     // FIXME(eddyb) this is an awkward spot for this method, maybe move it?
     pub fn layout_scalar_valid_range(self, def_id: DefId) -> (Bound<u128>, Bound<u128>) {
-        let get = |name| {
-            let Some(attr) = self.get_attr(def_id, name) else {
-                return Bound::Unbounded;
-            };
-            debug!("layout_scalar_valid_range: attr={:?}", attr);
-            if let Some(
-                &[
-                    ast::MetaItemInner::Lit(ast::MetaItemLit {
-                        kind: ast::LitKind::Int(a, _), ..
-                    }),
-                ],
-            ) = attr.meta_item_list().as_deref()
-            {
-                Bound::Included(a.get())
-            } else {
-                self.dcx().span_delayed_bug(
-                    attr.span(),
-                    "invalid rustc_layout_scalar_valid_range attribute",
-                );
-                Bound::Unbounded
-            }
-        };
-        (
-            get(sym::rustc_layout_scalar_valid_range_start),
-            get(sym::rustc_layout_scalar_valid_range_end),
-        )
+        let start = find_attr!(self.get_all_attrs(def_id), AttributeKind::RustcLayoutScalarValidRangeStart(n, _) => Bound::Included(**n)).unwrap_or(Bound::Unbounded);
+        let end = find_attr!(self.get_all_attrs(def_id), AttributeKind::RustcLayoutScalarValidRangeEnd(n, _) => Bound::Included(**n)).unwrap_or(Bound::Unbounded);
+        (start, end)
     }
 
     pub fn lift<T: Lift<TyCtxt<'tcx>>>(self, value: T) -> Option<T::Lifted> {