Auto merge of #138165 - jdonszelmann:inline, r=oli-obk

Rewrite `inline` attribute parser to use new infrastructure and improve diagnostics for all parsed attributes

r? `@oli-obk`

This PR:
- creates a new parser for inline attributes
- creates consistent error messages and error codes between attribute parsers; inline and others
- as such changes a few error messages for other attributes to be (in my eyes) much more consistent
- tests ast-lowering lints introduced by rust-lang/rust#138164 since this is now useful for the first time
- Coalesce some useless error codes

Builds on top of rust-lang/rust#138164

Closes rust-lang/rust#137950

clippy_lints/src/attrs/inline_always.rs

@@ -1,29 +1,22 @@
 use super::INLINE_ALWAYS;
-use super::utils::is_word;
 use clippy_utils::diagnostics::span_lint;
+use rustc_attr_data_structures::{find_attr, AttributeKind, InlineAttr};
 use rustc_hir::Attribute;
 use rustc_lint::LateContext;
 use rustc_span::symbol::Symbol;
-use rustc_span::{Span, sym};
+use rustc_span::Span;
 
 pub(super) fn check(cx: &LateContext<'_>, span: Span, name: Symbol, attrs: &[Attribute]) {
     if span.from_expansion() {
         return;
     }
 
-    for attr in attrs {
-        if let Some(values) = attr.meta_item_list() {
-            if values.len() != 1 || !attr.has_name(sym::inline) {
-                continue;
-            }
-            if is_word(&values[0], sym::always) {
-                span_lint(
-                    cx,
-                    INLINE_ALWAYS,
-                    attr.span(),
-                    format!("you have declared `#[inline(always)]` on `{name}`. This is usually a bad idea"),
-                );
-            }
-        }
+    if let Some(span) = find_attr!(attrs, AttributeKind::Inline(InlineAttr::Always, span) => *span) {
+        span_lint(
+            cx,
+            INLINE_ALWAYS,
+            span,
+            format!("you have declared `#[inline(always)]` on `{name}`. This is usually a bad idea"),
+        );
     }
 }

clippy_lints/src/inline_fn_without_body.rs

@@ -1,10 +1,10 @@
 use clippy_utils::diagnostics::span_lint_and_then;
 use clippy_utils::sugg::DiagExt;
+use rustc_attr_data_structures::{find_attr, AttributeKind};
 use rustc_errors::Applicability;
 use rustc_hir::{TraitFn, TraitItem, TraitItemKind};
 use rustc_lint::{LateContext, LateLintPass};
 use rustc_session::declare_lint_pass;
-use rustc_span::sym;
 
 declare_clippy_lint! {
     /// ### What it does
@@ -32,15 +32,19 @@ declare_lint_pass!(InlineFnWithoutBody => [INLINE_FN_WITHOUT_BODY]);
 impl<'tcx> LateLintPass<'tcx> for InlineFnWithoutBody {
     fn check_trait_item(&mut self, cx: &LateContext<'tcx>, item: &'tcx TraitItem<'_>) {
         if let TraitItemKind::Fn(_, TraitFn::Required(_)) = item.kind
-            && let Some(attr) = cx.tcx.hir_attrs(item.hir_id()).iter().find(|a| a.has_name(sym::inline))
+            && let Some(attr_span) = find_attr!(cx
+                .tcx
+                .hir_attrs(item.hir_id()),
+                AttributeKind::Inline(_, span) => *span
+        )
         {
             span_lint_and_then(
                 cx,
                 INLINE_FN_WITHOUT_BODY,
-                attr.span(),
+                attr_span,
                 format!("use of `#[inline]` on trait method `{}` which has no body", item.ident),
                 |diag| {
-                    diag.suggest_remove_item(cx, attr.span(), "remove", Applicability::MachineApplicable);
+                    diag.suggest_remove_item(cx, attr_span, "remove", Applicability::MachineApplicable);
                 },
             );
         }

clippy_lints/src/missing_inline.rs

@@ -1,10 +1,11 @@
 use clippy_utils::diagnostics::span_lint;
+use rustc_attr_data_structures::{find_attr, AttributeKind};
 use rustc_hir as hir;
 use rustc_hir::Attribute;
 use rustc_lint::{LateContext, LateLintPass, LintContext};
 use rustc_middle::ty::AssocItemContainer;
 use rustc_session::declare_lint_pass;
-use rustc_span::{Span, sym};
+use rustc_span::Span;
 
 declare_clippy_lint! {
     /// ### What it does
@@ -64,8 +65,7 @@ declare_clippy_lint! {
 }
 
 fn check_missing_inline_attrs(cx: &LateContext<'_>, attrs: &[Attribute], sp: Span, desc: &'static str) {
-    let has_inline = attrs.iter().any(|a| a.has_name(sym::inline));
-    if !has_inline {
+    if !find_attr!(attrs, AttributeKind::Inline(..)) {
         span_lint(
             cx,
             MISSING_INLINE_IN_PUBLIC_ITEMS,

clippy_lints/src/pass_by_ref_or_value.rs

@@ -3,10 +3,10 @@ use clippy_utils::diagnostics::span_lint_and_sugg;
 use clippy_utils::source::snippet;
 use clippy_utils::ty::{for_each_top_level_late_bound_region, is_copy};
 use clippy_utils::{is_self, is_self_ty};
+use rustc_attr_data_structures::{find_attr, AttributeKind, InlineAttr};
+use rustc_data_structures::fx::FxHashSet;
 use core::ops::ControlFlow;
 use rustc_abi::ExternAbi;
-use rustc_ast::attr;
-use rustc_data_structures::fx::FxHashSet;
 use rustc_errors::Applicability;
 use rustc_hir as hir;
 use rustc_hir::intravisit::FnKind;
@@ -270,11 +270,13 @@ impl<'tcx> LateLintPass<'tcx> for PassByRefOrValue {
                     return;
                 }
                 let attrs = cx.tcx.hir_attrs(hir_id);
+                if find_attr!(attrs, AttributeKind::Inline(InlineAttr::Always, _)) {
+                    return;
+                }
+
                 for a in attrs {
-                    if let Some(meta_items) = a.meta_item_list()
-                        && (a.has_name(sym::proc_macro_derive)
-                            || (a.has_name(sym::inline) && attr::list_contains_name(&meta_items, sym::always)))
-                    {
+                    // FIXME(jdonszelmann): make part of the find_attr above
+                    if a.has_name(sym::proc_macro_derive) {
                         return;
                     }
                 }