Rollup merge of #145155 - scrabsha:push-tkvwkolzooyq, r=jdonszelmann

Port `#[allow_internal_unsafe]` to the new attribute system (attempt 2)

This is a slightly modified version of ae1487aa9922de7642c448cc0908584026699e1c, which caused a performance regression (reverted in https://github.com/rust-lang/rust/pull/145086#issue-3303428759). The diff between this PR and the previous one can be seen in 027a1def.

r? ```````@jdonszelmann``````` :sparkling_heart:

1 files changed, 14 insertions, 6 deletions

diff --git a/compiler/rustc_lint/src/builtin.rs b/compiler/rustc_lint/src/builtin.rs
index 54769f9e097..8006cfcf30f 100644
--- a/compiler/rustc_lint/src/builtin.rs
+++ b/compiler/rustc_lint/src/builtin.rs
@@ -21,6 +21,7 @@ use rustc_ast::tokenstream::{TokenStream, TokenTree};
 use rustc_ast::visit::{FnCtxt, FnKind};
 use rustc_ast::{self as ast, *};
 use rustc_ast_pretty::pprust::expr_to_string;
+use rustc_attr_parsing::AttributeParser;
 use rustc_errors::{Applicability, LintDiagnostic};
 use rustc_feature::GateIssue;
 use rustc_hir as hir;
@@ -248,12 +249,6 @@ impl UnsafeCode {
 }
 
 impl EarlyLintPass for UnsafeCode {
-    fn check_attribute(&mut self, cx: &EarlyContext<'_>, attr: &ast::Attribute) {
-        if attr.has_name(sym::allow_internal_unsafe) {
-            self.report_unsafe(cx, attr.span, BuiltinUnsafe::AllowInternalUnsafe);
-        }
-    }
-
     #[inline]
     fn check_expr(&mut self, cx: &EarlyContext<'_>, e: &ast::Expr) {
         if let ast::ExprKind::Block(ref blk, _) = e.kind {
@@ -315,6 +310,19 @@ impl EarlyLintPass for UnsafeCode {
                 }
             }
 
+            ast::ItemKind::MacroDef(..) => {
+                if let Some(attr) = AttributeParser::parse_limited(
+                    cx.builder.sess(),
+                    &it.attrs,
+                    sym::allow_internal_unsafe,
+                    it.span,
+                    DUMMY_NODE_ID,
+                    Some(cx.builder.features()),
+                ) {
+                    self.report_unsafe(cx, attr.span(), BuiltinUnsafe::AllowInternalUnsafe);
+                }
+            }
+
             _ => {}
         }
     }