rustc_attr_parsing/attributes/
debugger.rs

1use rustc_hir::attrs::{DebugVisualizer, DebuggerVisualizerType};
2
3use super::prelude::*;
4
5pub(crate) struct DebuggerViualizerParser;
6
7impl<S: Stage> CombineAttributeParser<S> for DebuggerViualizerParser {
8    const PATH: &[Symbol] = &[sym::debugger_visualizer];
9    const ALLOWED_TARGETS: AllowedTargets =
10        AllowedTargets::AllowList(&[Allow(Target::Mod), Allow(Target::Crate)]);
11    const TEMPLATE: AttributeTemplate = template!(
12        List: &[r#"natvis_file = "...", gdb_script_file = "...""#],
13        "https://doc.rust-lang.org/reference/attributes/debugger.html#the-debugger_visualizer-attribute"
14    );
15
16    type Item = DebugVisualizer;
17    const CONVERT: ConvertFn<Self::Item> = |v, _| AttributeKind::DebuggerVisualizer(v);
18
19    fn extend<'c>(
20        cx: &'c mut AcceptContext<'_, '_, S>,
21        args: &'c ArgParser<'_>,
22    ) -> impl IntoIterator<Item = Self::Item> + 'c {
23        let Some(l) = args.list() else {
24            cx.expected_list(args.span().unwrap_or(cx.attr_span));
25            return None;
26        };
27        let Some(single) = l.single() else {
28            cx.expected_single_argument(l.span);
29            return None;
30        };
31        let Some(mi) = single.meta_item() else {
32            cx.expected_name_value(single.span(), None);
33            return None;
34        };
35        let path = mi.path().word_sym();
36        let visualizer_type = match path {
37            Some(sym::natvis_file) => DebuggerVisualizerType::Natvis,
38            Some(sym::gdb_script_file) => DebuggerVisualizerType::GdbPrettyPrinter,
39            _ => {
40                cx.expected_specific_argument(
41                    mi.path().span(),
42                    &[sym::natvis_file, sym::gdb_script_file],
43                );
44                return None;
45            }
46        };
47
48        let Some(path) = mi.args().name_value() else {
49            cx.expected_name_value(single.span(), path);
50            return None;
51        };
52
53        let Some(path) = path.value_as_str() else {
54            cx.expected_string_literal(path.value_span, Some(path.value_as_lit()));
55            return None;
56        };
57
58        Some(DebugVisualizer { span: mi.span(), visualizer_type, path })
59    }
60}
rustc_attr_parsing/attributes/debugger.rs

rustc_attr_parsing/attributes/
debugger.rs
