1 files changed, 35 insertions, 0 deletions
diff --git a/compiler/rustc_builtin_macros/src/cmdline_attrs.rs b/compiler/rustc_builtin_macros/src/cmdline_attrs.rs
new file mode 100644
index 00000000000..34e2accc615
--- /dev/null
+++ b/compiler/rustc_builtin_macros/src/cmdline_attrs.rs
@@ -0,0 +1,35 @@
+//! Attributes injected into the crate root from command line using `-Z crate-attr`.
+
+use rustc_ast::attr::mk_attr;
+use rustc_ast::token;
+use rustc_ast::{self as ast, AttrItem, AttrStyle};
+use rustc_session::parse::ParseSess;
+use rustc_span::FileName;
+
+pub fn inject(mut krate: ast::Crate, parse_sess: &ParseSess, attrs: &[String]) -> ast::Crate {
+    for raw_attr in attrs {
+        let mut parser = rustc_parse::new_parser_from_source_str(
+            parse_sess,
+            FileName::cli_crate_attr_source_code(&raw_attr),
+            raw_attr.clone(),
+        );
+
+        let start_span = parser.token.span;
+        let AttrItem { path, args } = match parser.parse_attr_item() {
+            Ok(ai) => ai,
+            Err(mut err) => {
+                err.emit();
+                continue;
+            }
+        };
+        let end_span = parser.token.span;
+        if parser.token != token::Eof {
+            parse_sess.span_diagnostic.span_err(start_span.to(end_span), "invalid crate attribute");
+            continue;
+        }
+
+        krate.attrs.push(mk_attr(AttrStyle::Inner, path, args, start_span.to(end_span)));
+    }
+
+    krate
+}