rustc_attr_parsing/attributes/diagnostic/
on_move.rs

1use rustc_errors::Diagnostic;
2use rustc_feature::template;
3use rustc_hir::attrs::AttributeKind;
4use rustc_session::lint::builtin::MISPLACED_DIAGNOSTIC_ATTRIBUTES;
5use rustc_span::sym;
6
7use crate::attributes::diagnostic::*;
8use crate::attributes::prelude::*;
9use crate::context::AcceptContext;
10use crate::errors::DiagnosticOnMoveOnlyForAdt;
11use crate::parser::ArgParser;
12use crate::target_checking::{ALL_TARGETS, AllowedTargets};
13
14#[derive(#[automatically_derived]
impl ::core::default::Default for OnMoveParser {
    #[inline]
    fn default() -> OnMoveParser {
        OnMoveParser {
            span: ::core::default::Default::default(),
            directive: ::core::default::Default::default(),
        }
    }
}Default)]
15pub(crate) struct OnMoveParser {
16    span: Option<Span>,
17    directive: Option<(Span, Directive)>,
18}
19
20impl OnMoveParser {
21    fn parse<'sess>(&mut self, cx: &mut AcceptContext<'_, 'sess>, args: &ArgParser, mode: Mode) {
22        if !cx.features().diagnostic_on_move() {
23            // `UnknownDiagnosticAttribute` is emitted in rustc_resolve/macros.rs
24            return;
25        }
26
27        let span = cx.attr_span;
28        self.span = Some(span);
29
30        if !#[allow(non_exhaustive_omitted_patterns)] match cx.target {
    Target::Enum | Target::Struct | Target::Union => true,
    _ => false,
}matches!(cx.target, Target::Enum | Target::Struct | Target::Union) {
31            cx.emit_lint(
32                MISPLACED_DIAGNOSTIC_ATTRIBUTES,
33                move |dcx, level| DiagnosticOnMoveOnlyForAdt.into_diag(dcx, level),
34                span,
35            );
36            return;
37        }
38
39        let Some(items) = parse_list(cx, args, mode) else { return };
40
41        if let Some(directive) = parse_directive_items(cx, mode, items.mixed(), true) {
42            merge_directives(cx, &mut self.directive, (span, directive));
43        }
44    }
45}
46impl AttributeParser for OnMoveParser {
47    const ATTRIBUTES: AcceptMapping<Self> = &[(
48        &[sym::diagnostic, sym::on_move],
49        ::rustc_feature::AttributeTemplate {
    word: false,
    list: Some(&[r#"/*opt*/ message = "...", /*opt*/ label = "...", /*opt*/ note = "...""#]),
    one_of: &[],
    name_value_str: None,
    docs: None,
}template!(List: &[r#"/*opt*/ message = "...", /*opt*/ label = "...", /*opt*/ note = "...""#]),
50        |this, cx, args| {
51            this.parse(cx, args, Mode::DiagnosticOnMove);
52        },
53    )];
54
55    // "Allowed" for all targets but noop if used on not-adt.
56    const ALLOWED_TARGETS: AllowedTargets = AllowedTargets::AllowList(ALL_TARGETS);
57
58    fn finalize(self, _cx: &FinalizeContext<'_, '_>) -> Option<AttributeKind> {
59        if let Some(span) = self.span {
60            Some(AttributeKind::OnMove { span, directive: self.directive.map(|d| Box::new(d.1)) })
61        } else {
62            None
63        }
64    }
65}
rustc_attr_parsing/attributes/diagnostic/on_move.rs

rustc_attr_parsing/attributes/diagnostic/
on_move.rs
