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Remove lots of generics from ty::print #116815

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merged 4 commits into from Oct 18, 2023
Merged

Remove lots of generics from ty::print #116815

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3895f0e
Remove "subprinter" types from `Printer`
Nilstrieb Oct 16, 2023
0b5a4c1
Remove `Print::Output`
Nilstrieb Oct 16, 2023
6038888
Remove `Printer::Error`
Nilstrieb Oct 16, 2023
6fc6a6d
Remove `Print::Error`
Nilstrieb Oct 16, 2023
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42 changes: 17 additions & 25 deletions compiler/rustc_const_eval/src/util/type_name.rs
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Expand Up @@ -3,7 +3,7 @@ use rustc_hir::def_id::CrateNum;
use rustc_hir::definitions::DisambiguatedDefPathData;
use rustc_middle::ty::{
self,
print::{PrettyPrinter, Print, Printer},
print::{PrettyPrinter, Print, PrintError, Printer},
GenericArg, GenericArgKind, Ty, TyCtxt,
};
use std::fmt::Write;
Expand All @@ -14,23 +14,15 @@ struct AbsolutePathPrinter<'tcx> {
}

impl<'tcx> Printer<'tcx> for AbsolutePathPrinter<'tcx> {
type Error = std::fmt::Error;

type Path = Self;
type Region = Self;
type Type = Self;
type DynExistential = Self;
type Const = Self;

fn tcx(&self) -> TyCtxt<'tcx> {
self.tcx
}

fn print_region(self, _region: ty::Region<'_>) -> Result<Self::Region, Self::Error> {
fn print_region(self, _region: ty::Region<'_>) -> Result<Self, PrintError> {
Ok(self)
}

fn print_type(mut self, ty: Ty<'tcx>) -> Result<Self::Type, Self::Error> {
fn print_type(mut self, ty: Ty<'tcx>) -> Result<Self, PrintError> {
match *ty.kind() {
// Types without identity.
ty::Bool
Expand Down Expand Up @@ -68,18 +60,18 @@ impl<'tcx> Printer<'tcx> for AbsolutePathPrinter<'tcx> {
}
}

fn print_const(self, ct: ty::Const<'tcx>) -> Result<Self::Const, Self::Error> {
fn print_const(self, ct: ty::Const<'tcx>) -> Result<Self, PrintError> {
self.pretty_print_const(ct, false)
}

fn print_dyn_existential(
self,
predicates: &'tcx ty::List<ty::PolyExistentialPredicate<'tcx>>,
) -> Result<Self::DynExistential, Self::Error> {
) -> Result<Self, PrintError> {
self.pretty_print_dyn_existential(predicates)
}

fn path_crate(mut self, cnum: CrateNum) -> Result<Self::Path, Self::Error> {
fn path_crate(mut self, cnum: CrateNum) -> Result<Self, PrintError> {
self.path.push_str(self.tcx.crate_name(cnum).as_str());
Ok(self)
}
Expand All @@ -88,17 +80,17 @@ impl<'tcx> Printer<'tcx> for AbsolutePathPrinter<'tcx> {
self,
self_ty: Ty<'tcx>,
trait_ref: Option<ty::TraitRef<'tcx>>,
) -> Result<Self::Path, Self::Error> {
) -> Result<Self, PrintError> {
self.pretty_path_qualified(self_ty, trait_ref)
}

fn path_append_impl(
self,
print_prefix: impl FnOnce(Self) -> Result<Self::Path, Self::Error>,
print_prefix: impl FnOnce(Self) -> Result<Self, PrintError>,
_disambiguated_data: &DisambiguatedDefPathData,
self_ty: Ty<'tcx>,
trait_ref: Option<ty::TraitRef<'tcx>>,
) -> Result<Self::Path, Self::Error> {
) -> Result<Self, PrintError> {
self.pretty_path_append_impl(
|mut cx| {
cx = print_prefix(cx)?;
Expand All @@ -114,9 +106,9 @@ impl<'tcx> Printer<'tcx> for AbsolutePathPrinter<'tcx> {

fn path_append(
mut self,
print_prefix: impl FnOnce(Self) -> Result<Self::Path, Self::Error>,
print_prefix: impl FnOnce(Self) -> Result<Self, PrintError>,
disambiguated_data: &DisambiguatedDefPathData,
) -> Result<Self::Path, Self::Error> {
) -> Result<Self, PrintError> {
self = print_prefix(self)?;

write!(self.path, "::{}", disambiguated_data.data).unwrap();
Expand All @@ -126,9 +118,9 @@ impl<'tcx> Printer<'tcx> for AbsolutePathPrinter<'tcx> {

fn path_generic_args(
mut self,
print_prefix: impl FnOnce(Self) -> Result<Self::Path, Self::Error>,
print_prefix: impl FnOnce(Self) -> Result<Self, PrintError>,
args: &[GenericArg<'tcx>],
) -> Result<Self::Path, Self::Error> {
) -> Result<Self, PrintError> {
self = print_prefix(self)?;
let args =
args.iter().cloned().filter(|arg| !matches!(arg.unpack(), GenericArgKind::Lifetime(_)));
Expand All @@ -144,9 +136,9 @@ impl<'tcx> PrettyPrinter<'tcx> for AbsolutePathPrinter<'tcx> {
fn should_print_region(&self, _region: ty::Region<'_>) -> bool {
false
}
fn comma_sep<T>(mut self, mut elems: impl Iterator<Item = T>) -> Result<Self, Self::Error>
fn comma_sep<T>(mut self, mut elems: impl Iterator<Item = T>) -> Result<Self, PrintError>
where
T: Print<'tcx, Self, Output = Self, Error = Self::Error>,
T: Print<'tcx, Self>,
{
if let Some(first) = elems.next() {
self = first.print(self)?;
Expand All @@ -160,8 +152,8 @@ impl<'tcx> PrettyPrinter<'tcx> for AbsolutePathPrinter<'tcx> {

fn generic_delimiters(
mut self,
f: impl FnOnce(Self) -> Result<Self, Self::Error>,
) -> Result<Self, Self::Error> {
f: impl FnOnce(Self) -> Result<Self, PrintError>,
) -> Result<Self, PrintError> {
write!(self, "<")?;

self = f(self)?;
Expand Down
69 changes: 32 additions & 37 deletions compiler/rustc_infer/src/infer/error_reporting/mod.rs
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Expand Up @@ -67,7 +67,7 @@ use rustc_hir::def_id::{DefId, LocalDefId};
use rustc_hir::intravisit::Visitor;
use rustc_hir::lang_items::LangItem;
use rustc_middle::dep_graph::DepContext;
use rustc_middle::ty::print::with_forced_trimmed_paths;
use rustc_middle::ty::print::{with_forced_trimmed_paths, PrintError};
use rustc_middle::ty::relate::{self, RelateResult, TypeRelation};
use rustc_middle::ty::{
self, error::TypeError, IsSuggestable, List, Region, Ty, TyCtxt, TypeFoldable,
Expand Down Expand Up @@ -580,76 +580,68 @@ impl<'tcx> TypeErrCtxt<'_, 'tcx> {

struct AbsolutePathPrinter<'tcx> {
tcx: TyCtxt<'tcx>,
segments: Vec<String>,
}

struct NonTrivialPath;

impl<'tcx> Printer<'tcx> for AbsolutePathPrinter<'tcx> {
type Error = NonTrivialPath;

type Path = Vec<String>;
type Region = !;
type Type = !;
type DynExistential = !;
type Const = !;

fn tcx<'a>(&'a self) -> TyCtxt<'tcx> {
self.tcx
}

fn print_region(self, _region: ty::Region<'_>) -> Result<Self::Region, Self::Error> {
Err(NonTrivialPath)
fn print_region(self, _region: ty::Region<'_>) -> Result<Self, PrintError> {
Err(fmt::Error)
}

fn print_type(self, _ty: Ty<'tcx>) -> Result<Self::Type, Self::Error> {
Err(NonTrivialPath)
fn print_type(self, _ty: Ty<'tcx>) -> Result<Self, PrintError> {
Err(fmt::Error)
}

fn print_dyn_existential(
self,
_predicates: &'tcx ty::List<ty::PolyExistentialPredicate<'tcx>>,
) -> Result<Self::DynExistential, Self::Error> {
Err(NonTrivialPath)
) -> Result<Self, PrintError> {
Err(fmt::Error)
}

fn print_const(self, _ct: ty::Const<'tcx>) -> Result<Self::Const, Self::Error> {
Err(NonTrivialPath)
fn print_const(self, _ct: ty::Const<'tcx>) -> Result<Self, PrintError> {
Err(fmt::Error)
}

fn path_crate(self, cnum: CrateNum) -> Result<Self::Path, Self::Error> {
Ok(vec![self.tcx.crate_name(cnum).to_string()])
fn path_crate(mut self, cnum: CrateNum) -> Result<Self, PrintError> {
self.segments = vec![self.tcx.crate_name(cnum).to_string()];
Ok(self)
}
fn path_qualified(
self,
_self_ty: Ty<'tcx>,
_trait_ref: Option<ty::TraitRef<'tcx>>,
) -> Result<Self::Path, Self::Error> {
Err(NonTrivialPath)
) -> Result<Self, PrintError> {
Err(fmt::Error)
}

fn path_append_impl(
self,
_print_prefix: impl FnOnce(Self) -> Result<Self::Path, Self::Error>,
_print_prefix: impl FnOnce(Self) -> Result<Self, PrintError>,
_disambiguated_data: &DisambiguatedDefPathData,
_self_ty: Ty<'tcx>,
_trait_ref: Option<ty::TraitRef<'tcx>>,
) -> Result<Self::Path, Self::Error> {
Err(NonTrivialPath)
) -> Result<Self, PrintError> {
Err(fmt::Error)
}
fn path_append(
self,
print_prefix: impl FnOnce(Self) -> Result<Self::Path, Self::Error>,
mut self,
print_prefix: impl FnOnce(Self) -> Result<Self, PrintError>,
disambiguated_data: &DisambiguatedDefPathData,
) -> Result<Self::Path, Self::Error> {
let mut path = print_prefix(self)?;
path.push(disambiguated_data.to_string());
Ok(path)
) -> Result<Self, PrintError> {
self = print_prefix(self)?;
self.segments.push(disambiguated_data.to_string());
Ok(self)
}
fn path_generic_args(
self,
print_prefix: impl FnOnce(Self) -> Result<Self::Path, Self::Error>,
print_prefix: impl FnOnce(Self) -> Result<Self, PrintError>,
_args: &[GenericArg<'tcx>],
) -> Result<Self::Path, Self::Error> {
) -> Result<Self, PrintError> {
print_prefix(self)
}
}
Expand All @@ -659,12 +651,15 @@ impl<'tcx> TypeErrCtxt<'_, 'tcx> {
// are from a local module we could have false positives, e.g.
// let _ = [{struct Foo; Foo}, {struct Foo; Foo}];
if did1.krate != did2.krate {
let abs_path =
|def_id| AbsolutePathPrinter { tcx: self.tcx }.print_def_path(def_id, &[]);
let abs_path = |def_id| {
AbsolutePathPrinter { tcx: self.tcx, segments: vec![] }
.print_def_path(def_id, &[])
.map(|p| p.segments)
};

// We compare strings because DefPath can be different
// for imported and non-imported crates
let same_path = || -> Result<_, NonTrivialPath> {
let same_path = || -> Result<_, PrintError> {
Ok(self.tcx.def_path_str(did1) == self.tcx.def_path_str(did2)
|| abs_path(did1)? == abs_path(did2)?)
};
Expand Down
4 changes: 2 additions & 2 deletions compiler/rustc_infer/src/infer/error_reporting/nice_region_error/placeholder_error.rs
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Expand Up @@ -28,7 +28,7 @@ pub struct Highlighted<'tcx, T> {

impl<'tcx, T> IntoDiagnosticArg for Highlighted<'tcx, T>
where
T: for<'a> Print<'tcx, FmtPrinter<'a, 'tcx>, Error = fmt::Error, Output = FmtPrinter<'a, 'tcx>>,
T: for<'a> Print<'tcx, FmtPrinter<'a, 'tcx>>,
{
fn into_diagnostic_arg(self) -> rustc_errors::DiagnosticArgValue<'static> {
rustc_errors::DiagnosticArgValue::Str(self.to_string().into())
Expand All @@ -43,7 +43,7 @@ impl<'tcx, T> Highlighted<'tcx, T> {

impl<'tcx, T> fmt::Display for Highlighted<'tcx, T>
where
T: for<'a> Print<'tcx, FmtPrinter<'a, 'tcx>, Error = fmt::Error, Output = FmtPrinter<'a, 'tcx>>,
T: for<'a> Print<'tcx, FmtPrinter<'a, 'tcx>>,
{
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
let mut printer = ty::print::FmtPrinter::new(self.tcx, Namespace::TypeNS);
Expand Down