use std::ops::ControlFlow;
use super::ty::{
Allocation, Binder, ConstDef, ExistentialPredicate, FnSig, GenericArgKind, GenericArgs,
MirConst, Promoted, Region, RigidTy, TermKind, Ty, UnevaluatedConst,
};
use crate::Opaque;
use crate::ty::TyConst;
pub trait Visitor: Sized {
type Break;
fn visit_ty(&mut self, ty: &Ty) -> ControlFlow<Self::Break> {
ty.super_visit(self)
}
fn visit_const(&mut self, c: &TyConst) -> ControlFlow<Self::Break> {
c.super_visit(self)
}
fn visit_reg(&mut self, reg: &Region) -> ControlFlow<Self::Break> {
reg.super_visit(self)
}
}
pub trait Visitable {
fn visit<V: Visitor>(&self, visitor: &mut V) -> ControlFlow<V::Break> {
self.super_visit(visitor)
}
fn super_visit<V: Visitor>(&self, visitor: &mut V) -> ControlFlow<V::Break>;
}
impl Visitable for Ty {
fn visit<V: Visitor>(&self, visitor: &mut V) -> ControlFlow<V::Break> {
visitor.visit_ty(self)
}
fn super_visit<V: Visitor>(&self, visitor: &mut V) -> ControlFlow<V::Break> {
match self.kind() {
super::ty::TyKind::RigidTy(ty) => ty.visit(visitor)?,
super::ty::TyKind::Alias(_, alias) => alias.args.visit(visitor)?,
super::ty::TyKind::Param(_) | super::ty::TyKind::Bound(_, _) => {}
}
ControlFlow::Continue(())
}
}
impl Visitable for TyConst {
fn visit<V: Visitor>(&self, visitor: &mut V) -> ControlFlow<V::Break> {
visitor.visit_const(self)
}
fn super_visit<V: Visitor>(&self, visitor: &mut V) -> ControlFlow<V::Break> {
match &self.kind {
crate::ty::TyConstKind::Param(_) | crate::ty::TyConstKind::Bound(_, _) => {}
crate::ty::TyConstKind::Unevaluated(_, args) => args.visit(visitor)?,
crate::ty::TyConstKind::Value(ty, alloc) => {
alloc.visit(visitor)?;
ty.visit(visitor)?;
}
crate::ty::TyConstKind::ZSTValue(ty) => ty.visit(visitor)?,
}
ControlFlow::Continue(())
}
}
impl Visitable for MirConst {
fn visit<V: Visitor>(&self, visitor: &mut V) -> ControlFlow<V::Break> {
self.super_visit(visitor)
}
fn super_visit<V: Visitor>(&self, visitor: &mut V) -> ControlFlow<V::Break> {
match &self.kind() {
super::ty::ConstantKind::Ty(ct) => ct.visit(visitor)?,
super::ty::ConstantKind::Allocated(alloc) => alloc.visit(visitor)?,
super::ty::ConstantKind::Unevaluated(uv) => uv.visit(visitor)?,
super::ty::ConstantKind::Param(_) | super::ty::ConstantKind::ZeroSized => {}
}
self.ty().visit(visitor)
}
}
impl Visitable for Opaque {
fn super_visit<V: Visitor>(&self, _visitor: &mut V) -> ControlFlow<V::Break> {
ControlFlow::Continue(())
}
}
impl Visitable for Allocation {
fn super_visit<V: Visitor>(&self, _visitor: &mut V) -> ControlFlow<V::Break> {
ControlFlow::Continue(())
}
}
impl Visitable for UnevaluatedConst {
fn super_visit<V: Visitor>(&self, visitor: &mut V) -> ControlFlow<V::Break> {
let UnevaluatedConst { def, args, promoted } = self;
def.visit(visitor)?;
args.visit(visitor)?;
promoted.visit(visitor)
}
}
impl Visitable for ConstDef {
fn super_visit<V: Visitor>(&self, _visitor: &mut V) -> ControlFlow<V::Break> {
ControlFlow::Continue(())
}
}
impl<T: Visitable> Visitable for Option<T> {
fn super_visit<V: Visitor>(&self, visitor: &mut V) -> ControlFlow<V::Break> {
match self {
Some(val) => val.visit(visitor),
None => ControlFlow::Continue(()),
}
}
}
impl Visitable for Promoted {
fn super_visit<V: Visitor>(&self, _visitor: &mut V) -> ControlFlow<V::Break> {
ControlFlow::Continue(())
}
}
impl Visitable for GenericArgs {
fn super_visit<V: Visitor>(&self, visitor: &mut V) -> ControlFlow<V::Break> {
self.0.visit(visitor)
}
}
impl Visitable for Region {
fn visit<V: Visitor>(&self, visitor: &mut V) -> ControlFlow<V::Break> {
visitor.visit_reg(self)
}
fn super_visit<V: Visitor>(&self, _: &mut V) -> ControlFlow<V::Break> {
ControlFlow::Continue(())
}
}
impl Visitable for GenericArgKind {
fn super_visit<V: Visitor>(&self, visitor: &mut V) -> ControlFlow<V::Break> {
match self {
GenericArgKind::Lifetime(lt) => lt.visit(visitor),
GenericArgKind::Type(t) => t.visit(visitor),
GenericArgKind::Const(c) => c.visit(visitor),
}
}
}
impl Visitable for RigidTy {
fn super_visit<V: Visitor>(&self, visitor: &mut V) -> ControlFlow<V::Break> {
match self {
RigidTy::Bool
| RigidTy::Char
| RigidTy::Int(_)
| RigidTy::Uint(_)
| RigidTy::Float(_)
| RigidTy::Never
| RigidTy::Foreign(_)
| RigidTy::Str => ControlFlow::Continue(()),
RigidTy::Array(t, c) => {
t.visit(visitor)?;
c.visit(visitor)
}
RigidTy::Pat(t, _p) => t.visit(visitor),
RigidTy::Slice(inner) => inner.visit(visitor),
RigidTy::RawPtr(ty, _) => ty.visit(visitor),
RigidTy::Ref(reg, ty, _) => {
reg.visit(visitor);
ty.visit(visitor)
}
RigidTy::Adt(_, args)
| RigidTy::Closure(_, args)
| RigidTy::Coroutine(_, args, _)
| RigidTy::CoroutineWitness(_, args)
| RigidTy::FnDef(_, args) => args.visit(visitor),
RigidTy::FnPtr(sig) => sig.visit(visitor),
RigidTy::Dynamic(pred, r, _) => {
pred.visit(visitor)?;
r.visit(visitor)
}
RigidTy::Tuple(fields) => fields.visit(visitor),
}
}
}
impl<T: Visitable> Visitable for Vec<T> {
fn super_visit<V: Visitor>(&self, visitor: &mut V) -> ControlFlow<V::Break> {
for arg in self {
arg.visit(visitor)?;
}
ControlFlow::Continue(())
}
}
impl<T: Visitable> Visitable for Binder<T> {
fn super_visit<V: Visitor>(&self, visitor: &mut V) -> ControlFlow<V::Break> {
self.value.visit(visitor)
}
}
impl Visitable for ExistentialPredicate {
fn super_visit<V: Visitor>(&self, visitor: &mut V) -> ControlFlow<V::Break> {
match self {
ExistentialPredicate::Trait(tr) => tr.generic_args.visit(visitor),
ExistentialPredicate::Projection(p) => {
p.term.visit(visitor)?;
p.generic_args.visit(visitor)
}
ExistentialPredicate::AutoTrait(_) => ControlFlow::Continue(()),
}
}
}
impl Visitable for TermKind {
fn super_visit<V: Visitor>(&self, visitor: &mut V) -> ControlFlow<V::Break> {
match self {
TermKind::Type(t) => t.visit(visitor),
TermKind::Const(c) => c.visit(visitor),
}
}
}
impl Visitable for FnSig {
fn super_visit<V: Visitor>(&self, visitor: &mut V) -> ControlFlow<V::Break> {
self.inputs_and_output.visit(visitor)
}
}