rustc_attr_parsing/attributes/
traits.rs

1use std::mem;
2
3use super::prelude::*;
4use crate::attributes::{NoArgsAttributeParser, SingleAttributeParser};
5use crate::context::AcceptContext;
6use crate::parser::ArgParser;
7use crate::target_checking::AllowedTargets;
8use crate::target_checking::Policy::{Allow, Warn};
9
10pub(crate) struct RustcSkipDuringMethodDispatchParser;
11impl SingleAttributeParser for RustcSkipDuringMethodDispatchParser {
12    const PATH: &[Symbol] = &[sym::rustc_skip_during_method_dispatch];
13    const ALLOWED_TARGETS: AllowedTargets = AllowedTargets::AllowList(&[Allow(Target::Trait)]);
14
15    const TEMPLATE: AttributeTemplate = ::rustc_feature::AttributeTemplate {
    word: false,
    list: Some(&["array, boxed_slice"]),
    one_of: &[],
    name_value_str: None,
    docs: None,
}template!(List: &["array, boxed_slice"]);
16
17    fn convert(cx: &mut AcceptContext<'_, '_>, args: &ArgParser) -> Option<AttributeKind> {
18        let mut array = false;
19        let mut boxed_slice = false;
20        let args = cx.expect_list(args, cx.attr_span)?;
21        if args.is_empty() {
22            cx.adcx().expected_at_least_one_argument(args.span);
23            return None;
24        }
25        for arg in args.mixed() {
26            let Some(arg) = arg.meta_item() else {
27                cx.adcx().expected_not_literal(arg.span());
28                continue;
29            };
30            let _ = cx.expect_no_args(arg.args());
31            let path = arg.path();
32            let (key, skip): (Symbol, &mut bool) = match path.word_sym() {
33                Some(key @ sym::array) => (key, &mut array),
34                Some(key @ sym::boxed_slice) => (key, &mut boxed_slice),
35                _ => {
36                    cx.adcx()
37                        .expected_specific_argument(path.span(), &[sym::array, sym::boxed_slice]);
38                    continue;
39                }
40            };
41            if mem::replace(skip, true) {
42                cx.adcx().duplicate_key(arg.span(), key);
43            }
44        }
45        Some(AttributeKind::RustcSkipDuringMethodDispatch { array, boxed_slice })
46    }
47}
48
49pub(crate) struct RustcParenSugarParser;
50impl NoArgsAttributeParser for RustcParenSugarParser {
51    const PATH: &[Symbol] = &[sym::rustc_paren_sugar];
52    const ALLOWED_TARGETS: AllowedTargets = AllowedTargets::AllowList(&[Allow(Target::Trait)]);
53    const CREATE: fn(Span) -> AttributeKind = |_| AttributeKind::RustcParenSugar;
54}
55
56// Markers
57
58pub(crate) struct MarkerParser;
59impl NoArgsAttributeParser for MarkerParser {
60    const PATH: &[Symbol] = &[sym::marker];
61    const ALLOWED_TARGETS: AllowedTargets = AllowedTargets::AllowList(&[
62        Allow(Target::Trait),
63        Warn(Target::Field),
64        Warn(Target::Arm),
65        Warn(Target::MacroDef),
66    ]);
67    const CREATE: fn(Span) -> AttributeKind = |_| AttributeKind::Marker;
68}
69
70pub(crate) struct RustcDenyExplicitImplParser;
71impl NoArgsAttributeParser for RustcDenyExplicitImplParser {
72    const PATH: &[Symbol] = &[sym::rustc_deny_explicit_impl];
73    const ALLOWED_TARGETS: AllowedTargets = AllowedTargets::AllowList(&[Allow(Target::Trait)]);
74    const CREATE: fn(Span) -> AttributeKind = |_| AttributeKind::RustcDenyExplicitImpl;
75}
76
77pub(crate) struct RustcDynIncompatibleTraitParser;
78impl NoArgsAttributeParser for RustcDynIncompatibleTraitParser {
79    const PATH: &[Symbol] = &[sym::rustc_dyn_incompatible_trait];
80    const ALLOWED_TARGETS: AllowedTargets = AllowedTargets::AllowList(&[Allow(Target::Trait)]);
81    const CREATE: fn(Span) -> AttributeKind = AttributeKind::RustcDynIncompatibleTrait;
82}
83
84// Specialization
85
86pub(crate) struct RustcSpecializationTraitParser;
87impl NoArgsAttributeParser for RustcSpecializationTraitParser {
88    const PATH: &[Symbol] = &[sym::rustc_specialization_trait];
89    const ALLOWED_TARGETS: AllowedTargets = AllowedTargets::AllowList(&[Allow(Target::Trait)]);
90    const CREATE: fn(Span) -> AttributeKind = |_| AttributeKind::RustcSpecializationTrait;
91}
92
93pub(crate) struct RustcUnsafeSpecializationMarkerParser;
94impl NoArgsAttributeParser for RustcUnsafeSpecializationMarkerParser {
95    const PATH: &[Symbol] = &[sym::rustc_unsafe_specialization_marker];
96    const ALLOWED_TARGETS: AllowedTargets = AllowedTargets::AllowList(&[Allow(Target::Trait)]);
97    const CREATE: fn(Span) -> AttributeKind = |_| AttributeKind::RustcUnsafeSpecializationMarker;
98}
99
100// Coherence
101
102pub(crate) struct RustcCoinductiveParser;
103impl NoArgsAttributeParser for RustcCoinductiveParser {
104    const PATH: &[Symbol] = &[sym::rustc_coinductive];
105    const ALLOWED_TARGETS: AllowedTargets = AllowedTargets::AllowList(&[Allow(Target::Trait)]);
106    const CREATE: fn(Span) -> AttributeKind = |_| AttributeKind::RustcCoinductive;
107}
108
109pub(crate) struct RustcAllowIncoherentImplParser;
110impl NoArgsAttributeParser for RustcAllowIncoherentImplParser {
111    const PATH: &[Symbol] = &[sym::rustc_allow_incoherent_impl];
112    const ALLOWED_TARGETS: AllowedTargets =
113        AllowedTargets::AllowList(&[Allow(Target::Method(MethodKind::Inherent))]);
114    const CREATE: fn(Span) -> AttributeKind = AttributeKind::RustcAllowIncoherentImpl;
115}
116
117pub(crate) struct FundamentalParser;
118impl NoArgsAttributeParser for FundamentalParser {
119    const PATH: &[Symbol] = &[sym::fundamental];
120    const ALLOWED_TARGETS: AllowedTargets =
121        AllowedTargets::AllowList(&[Allow(Target::Struct), Allow(Target::Trait)]);
122    const CREATE: fn(Span) -> AttributeKind = |_| AttributeKind::Fundamental;
123}
rustc_attr_parsing/attributes/traits.rs

rustc_attr_parsing/attributes/
traits.rs
