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|
//! This module implements some validity checks for attributes.
//! In particular it verifies that `#[inline]` and `#[repr]` attributes are
//! attached to items that actually support them and if there are
//! conflicts between multiple such attributes attached to the same
//! item.
use crate::hir;
use crate::{Item, ItemKind, TraitItem, TraitItemKind};
use crate::def::DefKind;
use std::fmt::{self, Display};
#[derive(Copy, Clone, PartialEq, Debug)]
pub enum GenericParamKind {
Type,
Lifetime,
Const,
}
#[derive(Copy, Clone, PartialEq, Debug)]
pub enum MethodKind {
Trait { body: bool },
Inherent,
}
#[derive(Copy, Clone, PartialEq, Debug)]
pub enum Target {
ExternCrate,
Use,
Static,
Const,
Fn,
Closure,
Mod,
ForeignMod,
GlobalAsm,
TyAlias,
OpaqueTy,
ImplTraitPlaceholder,
Enum,
Variant,
Struct,
Field,
Union,
Trait,
TraitAlias,
Impl,
Expression,
Statement,
Arm,
AssocConst,
Method(MethodKind),
AssocTy,
ForeignFn,
ForeignStatic,
ForeignTy,
GenericParam(GenericParamKind),
MacroDef,
Param,
PatField,
ExprField,
}
impl Display for Target {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
write!(f, "{}", Self::name(*self))
}
}
impl Target {
pub fn from_item(item: &Item<'_>) -> Target {
match item.kind {
ItemKind::ExternCrate(..) => Target::ExternCrate,
ItemKind::Use(..) => Target::Use,
ItemKind::Static(..) => Target::Static,
ItemKind::Const(..) => Target::Const,
ItemKind::Fn(..) => Target::Fn,
ItemKind::Macro(..) => Target::MacroDef,
ItemKind::Mod(..) => Target::Mod,
ItemKind::ForeignMod { .. } => Target::ForeignMod,
ItemKind::GlobalAsm(..) => Target::GlobalAsm,
ItemKind::TyAlias(..) => Target::TyAlias,
ItemKind::OpaqueTy(ref opaque) => {
if opaque.in_trait {
Target::ImplTraitPlaceholder
} else {
Target::OpaqueTy
}
}
ItemKind::Enum(..) => Target::Enum,
ItemKind::Struct(..) => Target::Struct,
ItemKind::Union(..) => Target::Union,
ItemKind::Trait(..) => Target::Trait,
ItemKind::TraitAlias(..) => Target::TraitAlias,
ItemKind::Impl { .. } => Target::Impl,
}
}
// FIXME: For now, should only be used with def_kinds from ItemIds
pub fn from_def_kind(def_kind: DefKind) -> Target {
match def_kind {
DefKind::ExternCrate => Target::ExternCrate,
DefKind::Use => Target::Use,
DefKind::Static(..) => Target::Static,
DefKind::Const => Target::Const,
DefKind::Fn => Target::Fn,
DefKind::Macro(..) => Target::MacroDef,
DefKind::Mod => Target::Mod,
DefKind::ForeignMod => Target::ForeignMod,
DefKind::GlobalAsm => Target::GlobalAsm,
DefKind::TyAlias => Target::TyAlias,
DefKind::OpaqueTy => Target::OpaqueTy,
DefKind::ImplTraitPlaceholder => Target::ImplTraitPlaceholder,
DefKind::Enum => Target::Enum,
DefKind::Struct => Target::Struct,
DefKind::Union => Target::Union,
DefKind::Trait => Target::Trait,
DefKind::TraitAlias => Target::TraitAlias,
DefKind::Impl => Target::Impl,
_ => panic!("impossible case reached"),
}
}
pub fn from_trait_item(trait_item: &TraitItem<'_>) -> Target {
match trait_item.kind {
TraitItemKind::Const(..) => Target::AssocConst,
TraitItemKind::Fn(_, hir::TraitFn::Required(_)) => {
Target::Method(MethodKind::Trait { body: false })
}
TraitItemKind::Fn(_, hir::TraitFn::Provided(_)) => {
Target::Method(MethodKind::Trait { body: true })
}
TraitItemKind::Type(..) => Target::AssocTy,
}
}
pub fn from_foreign_item(foreign_item: &hir::ForeignItem<'_>) -> Target {
match foreign_item.kind {
hir::ForeignItemKind::Fn(..) => Target::ForeignFn,
hir::ForeignItemKind::Static(..) => Target::ForeignStatic,
hir::ForeignItemKind::Type => Target::ForeignTy,
}
}
pub fn from_generic_param(generic_param: &hir::GenericParam<'_>) -> Target {
match generic_param.kind {
hir::GenericParamKind::Type { .. } => Target::GenericParam(GenericParamKind::Type),
hir::GenericParamKind::Lifetime { .. } => {
Target::GenericParam(GenericParamKind::Lifetime)
}
hir::GenericParamKind::Const { .. } => Target::GenericParam(GenericParamKind::Const),
}
}
pub fn name(self) -> &'static str {
match self {
Target::ExternCrate => "extern crate",
Target::Use => "use",
Target::Static => "static item",
Target::Const => "constant item",
Target::Fn => "function",
Target::Closure => "closure",
Target::Mod => "module",
Target::ForeignMod => "foreign module",
Target::GlobalAsm => "global asm",
Target::TyAlias => "type alias",
Target::OpaqueTy => "opaque type",
Target::ImplTraitPlaceholder => "opaque type in trait",
Target::Enum => "enum",
Target::Variant => "enum variant",
Target::Struct => "struct",
Target::Field => "struct field",
Target::Union => "union",
Target::Trait => "trait",
Target::TraitAlias => "trait alias",
Target::Impl => "implementation block",
Target::Expression => "expression",
Target::Statement => "statement",
Target::Arm => "match arm",
Target::AssocConst => "associated const",
Target::Method(kind) => match kind {
MethodKind::Inherent => "inherent method",
MethodKind::Trait { body: false } => "required trait method",
MethodKind::Trait { body: true } => "provided trait method",
},
Target::AssocTy => "associated type",
Target::ForeignFn => "foreign function",
Target::ForeignStatic => "foreign static item",
Target::ForeignTy => "foreign type",
Target::GenericParam(kind) => match kind {
GenericParamKind::Type => "type parameter",
GenericParamKind::Lifetime => "lifetime parameter",
GenericParamKind::Const => "const parameter",
},
Target::MacroDef => "macro def",
Target::Param => "function param",
Target::PatField => "pattern field",
Target::ExprField => "struct field",
}
}
}
|
