1 //! This module implements some validity checks for attributes.
2 //! In particular it verifies that `#[inline]` and `#[repr]` attributes are
3 //! attached to items that actually support them and if there are
4 //! conflicts between multiple such attributes attached to the same
8 use crate::{Item, ItemKind, TraitItem, TraitItemKind};
10 use crate::def::DefKind;
11 use std::fmt::{self, Display};
13 #[derive(Copy, Clone, PartialEq, Debug)]
14 pub enum GenericParamKind {
20 #[derive(Copy, Clone, PartialEq, Debug)]
26 #[derive(Copy, Clone, PartialEq, Debug)]
56 GenericParam(GenericParamKind),
63 impl Display for Target {
64 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
65 write!(f, "{}", Self::name(*self))
70 pub fn from_item(item: &Item<'_>) -> Target {
72 ItemKind::ExternCrate(..) => Target::ExternCrate,
73 ItemKind::Use(..) => Target::Use,
74 ItemKind::Static(..) => Target::Static,
75 ItemKind::Const(..) => Target::Const,
76 ItemKind::Fn(..) => Target::Fn,
77 ItemKind::Macro(..) => Target::MacroDef,
78 ItemKind::Mod(..) => Target::Mod,
79 ItemKind::ForeignMod { .. } => Target::ForeignMod,
80 ItemKind::GlobalAsm(..) => Target::GlobalAsm,
81 ItemKind::TyAlias(..) => Target::TyAlias,
82 ItemKind::OpaqueTy(..) => Target::OpaqueTy,
83 ItemKind::Enum(..) => Target::Enum,
84 ItemKind::Struct(..) => Target::Struct,
85 ItemKind::Union(..) => Target::Union,
86 ItemKind::Trait(..) => Target::Trait,
87 ItemKind::TraitAlias(..) => Target::TraitAlias,
88 ItemKind::Impl { .. } => Target::Impl,
92 // FIXME: For now, should only be used with def_kinds from ItemIds
93 pub fn from_def_kind(def_kind: DefKind) -> Target {
95 DefKind::ExternCrate => Target::ExternCrate,
96 DefKind::Use => Target::Use,
97 DefKind::Static(..) => Target::Static,
98 DefKind::Const => Target::Const,
99 DefKind::Fn => Target::Fn,
100 DefKind::Macro(..) => Target::MacroDef,
101 DefKind::Mod => Target::Mod,
102 DefKind::ForeignMod => Target::ForeignMod,
103 DefKind::GlobalAsm => Target::GlobalAsm,
104 DefKind::TyAlias => Target::TyAlias,
105 DefKind::OpaqueTy => Target::OpaqueTy,
106 DefKind::Enum => Target::Enum,
107 DefKind::Struct => Target::Struct,
108 DefKind::Union => Target::Union,
109 DefKind::Trait => Target::Trait,
110 DefKind::TraitAlias => Target::TraitAlias,
111 DefKind::Impl => Target::Impl,
112 _ => panic!("impossible case reached"),
116 pub fn from_trait_item(trait_item: &TraitItem<'_>) -> Target {
117 match trait_item.kind {
118 TraitItemKind::Const(..) => Target::AssocConst,
119 TraitItemKind::Fn(_, hir::TraitFn::Required(_)) => {
120 Target::Method(MethodKind::Trait { body: false })
122 TraitItemKind::Fn(_, hir::TraitFn::Provided(_)) => {
123 Target::Method(MethodKind::Trait { body: true })
125 TraitItemKind::Type(..) => Target::AssocTy,
129 pub fn from_foreign_item(foreign_item: &hir::ForeignItem<'_>) -> Target {
130 match foreign_item.kind {
131 hir::ForeignItemKind::Fn(..) => Target::ForeignFn,
132 hir::ForeignItemKind::Static(..) => Target::ForeignStatic,
133 hir::ForeignItemKind::Type => Target::ForeignTy,
137 pub fn from_generic_param(generic_param: &hir::GenericParam<'_>) -> Target {
138 match generic_param.kind {
139 hir::GenericParamKind::Type { .. } => Target::GenericParam(GenericParamKind::Type),
140 hir::GenericParamKind::Lifetime { .. } => {
141 Target::GenericParam(GenericParamKind::Lifetime)
143 hir::GenericParamKind::Const { .. } => Target::GenericParam(GenericParamKind::Const),
147 pub fn name(self) -> &'static str {
149 Target::ExternCrate => "extern crate",
150 Target::Use => "use",
151 Target::Static => "static item",
152 Target::Const => "constant item",
153 Target::Fn => "function",
154 Target::Closure => "closure",
155 Target::Mod => "module",
156 Target::ForeignMod => "foreign module",
157 Target::GlobalAsm => "global asm",
158 Target::TyAlias => "type alias",
159 Target::OpaqueTy => "opaque type",
160 Target::Enum => "enum",
161 Target::Variant => "enum variant",
162 Target::Struct => "struct",
163 Target::Field => "struct field",
164 Target::Union => "union",
165 Target::Trait => "trait",
166 Target::TraitAlias => "trait alias",
167 Target::Impl => "implementation block",
168 Target::Expression => "expression",
169 Target::Statement => "statement",
170 Target::Arm => "match arm",
171 Target::AssocConst => "associated const",
172 Target::Method(kind) => match kind {
173 MethodKind::Inherent => "inherent method",
174 MethodKind::Trait { body: false } => "required trait method",
175 MethodKind::Trait { body: true } => "provided trait method",
177 Target::AssocTy => "associated type",
178 Target::ForeignFn => "foreign function",
179 Target::ForeignStatic => "foreign static item",
180 Target::ForeignTy => "foreign type",
181 Target::GenericParam(kind) => match kind {
182 GenericParamKind::Type => "type parameter",
183 GenericParamKind::Lifetime => "lifetime parameter",
184 GenericParamKind::Const => "const parameter",
186 Target::MacroDef => "macro def",
187 Target::Param => "function param",
188 Target::PatField => "pattern field",
189 Target::ExprField => "struct field",