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Sep 2, 2023
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18 changes: 15 additions & 3 deletions compiler/rustc_smir/src/rustc_internal/mod.rs
Original file line number Diff line number Diff line change
Expand Up @@ -5,7 +5,6 @@

use std::fmt::Debug;
use std::ops::Index;
use std::string::ToString;

use crate::rustc_internal;
use crate::{
Expand Down Expand Up @@ -156,10 +155,23 @@ pub fn run(tcx: TyCtxt<'_>, f: impl FnOnce()) {
}

/// A type that provides internal information but that can still be used for debug purpose.
pub type Opaque = impl Debug + ToString + Clone;
#[derive(Clone)]
pub struct Opaque(String);

impl std::fmt::Display for Opaque {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
write!(f, "{}", self.0)
}
}

impl std::fmt::Debug for Opaque {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
write!(f, "{:?}", self.0)
}
}

pub(crate) fn opaque<T: Debug>(value: &T) -> Opaque {
format!("{value:?}")
Opaque(format!("{value:?}"))
}

pub struct StableMir {
Expand Down
1 change: 1 addition & 0 deletions compiler/rustc_smir/src/stable_mir/mod.rs
Original file line number Diff line number Diff line change
Expand Up @@ -20,6 +20,7 @@ use crate::rustc_smir::Tables;

pub mod mir;
pub mod ty;
pub mod visitor;

/// Use String for now but we should replace it.
pub type Symbol = String;
Expand Down
186 changes: 186 additions & 0 deletions compiler/rustc_smir/src/stable_mir/visitor.rs
Original file line number Diff line number Diff line change
@@ -0,0 +1,186 @@
use std::ops::ControlFlow;

use crate::rustc_internal::Opaque;

use super::ty::{
Allocation, Binder, Const, ConstDef, ExistentialPredicate, FnSig, GenericArgKind, GenericArgs,
Promoted, RigidTy, TermKind, Ty, UnevaluatedConst,
};

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: &Const) -> ControlFlow<Self::Break> {
c.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(_) => todo!(),
super::ty::TyKind::Bound(_, _) => todo!(),
}
}
}

impl Visitable for Const {
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.literal {
super::ty::ConstantKind::Allocated(alloc) => alloc.visit(visitor),
super::ty::ConstantKind::Unevaluated(uv) => uv.visit(visitor),
super::ty::ConstantKind::ParamCt(param) => param.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 { ty, def, args, promoted } = self;
ty.visit(visitor)?;
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 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::Slice(inner) => inner.visit(visitor),
RigidTy::RawPtr(ty, _) => ty.visit(visitor),
RigidTy::Ref(_, ty, _) => ty.visit(visitor),
RigidTy::FnDef(_, args) => args.visit(visitor),
RigidTy::FnPtr(sig) => sig.visit(visitor),
RigidTy::Closure(_, args) => args.visit(visitor),
RigidTy::Generator(_, args, _) => args.visit(visitor),
RigidTy::Dynamic(pred, r, _) => {
pred.visit(visitor)?;
r.visit(visitor)
}
RigidTy::Tuple(fields) => fields.visit(visitor),
RigidTy::Adt(_, args) => args.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)
}
}