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Auto merge of #113591 - mdibaiee:genericargs-cleanup, r=oli-obk
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refactor(rustc_middle): Substs -> GenericArg

resolves #110793

- [x] rename `SubstsRef` and `InternalSubsts` to `GenericArgsRef<'tcx>` and `GenericArgs<'tcx>`.
- [x] rename variables and fields currently using `substs` to `args`.
- [x] update the module name of `ty::subst` to `ty::generic_args` or sth. Make that module private and publicly reexport its content in the ty module.
- [x] rename `EarlyBinder::subst(_identity)` to `EarlyBinder::instantiate(_identity)`.
- [x] types called `[a-zA-Z]+Substs` renamed to `XArgs`.
- [x] functions containing `substs` now use `args` or `generic_args` (mostly the former).

However, the verb of "substituting" is still being used here and there, mostly in comments. I think that can be a separate PR as part of #110254 to change the verb to `replace_generics` or something similar.
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@bors
bors committed Jul 14, 2023
2 parents bacf5bc + e55583c commit 5767cad
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10 changes: 5 additions & 5 deletions compiler/rustc_borrowck/src/constraint_generation.rs
View file
Original file line number Diff line number Diff line change
Expand Up @@ -7,8 +7,8 @@ use rustc_middle::mir::{
Body, Local, Location, Place, PlaceRef, ProjectionElem, Rvalue, SourceInfo, Statement,
StatementKind, Terminator, TerminatorKind, UserTypeProjection,
};
use rustc_middle::ty::subst::SubstsRef;
use rustc_middle::ty::visit::TypeVisitable;
use rustc_middle::ty::GenericArgsRef;
use rustc_middle::ty::{self, RegionVid, Ty, TyCtxt};

use crate::{
Expand Down Expand Up @@ -49,11 +49,11 @@ struct ConstraintGeneration<'cg, 'tcx> {
}

impl<'cg, 'tcx> Visitor<'tcx> for ConstraintGeneration<'cg, 'tcx> {
/// We sometimes have `substs` within an rvalue, or within a
/// We sometimes have `args` within an rvalue, or within a
/// call. Make them live at the location where they appear.
fn visit_substs(&mut self, substs: &SubstsRef<'tcx>, location: Location) {
self.add_regular_live_constraint(*substs, location);
self.super_substs(substs);
fn visit_args(&mut self, args: &GenericArgsRef<'tcx>, location: Location) {
self.add_regular_live_constraint(*args, location);
self.super_args(args);
}

/// We sometimes have `region` within an rvalue, or within a
Expand Down
22 changes: 11 additions & 11 deletions compiler/rustc_borrowck/src/diagnostics/conflict_errors.rs
View file
Original file line number Diff line number Diff line change
Expand Up @@ -702,11 +702,11 @@ impl<'cx, 'tcx> MirBorrowckCtxt<'cx, 'tcx> {
.iter()
.copied()
.find_map(find_fn_kind_from_did),
ty::Alias(ty::Opaque, ty::AliasTy { def_id, substs, .. }) => tcx
ty::Alias(ty::Opaque, ty::AliasTy { def_id, args, .. }) => tcx
.explicit_item_bounds(def_id)
.subst_iter_copied(tcx, substs)
.arg_iter_copied(tcx, args)
.find_map(|(clause, span)| find_fn_kind_from_did((clause, span))),
ty::Closure(_, substs) => match substs.as_closure().kind() {
ty::Closure(_, args) => match args.as_closure().kind() {
ty::ClosureKind::Fn => Some(hir::Mutability::Not),
ty::ClosureKind::FnMut => Some(hir::Mutability::Mut),
_ => None,
Expand Down Expand Up @@ -1448,11 +1448,11 @@ impl<'cx, 'tcx> MirBorrowckCtxt<'cx, 'tcx> {
}

// Get closure's arguments
let ty::Closure(_, substs) = typeck_results.expr_ty(closure_expr).kind() else {
let ty::Closure(_, args) = typeck_results.expr_ty(closure_expr).kind() else {
/* hir::Closure can be a generator too */
return;
};
let sig = substs.as_closure().sig();
let sig = args.as_closure().sig();
let tupled_params =
tcx.erase_late_bound_regions(sig.inputs().iter().next().unwrap().map_bound(|&b| b));
let ty::Tuple(params) = tupled_params.kind() else { return };
Expand Down Expand Up @@ -2676,7 +2676,7 @@ impl<'cx, 'tcx> MirBorrowckCtxt<'cx, 'tcx> {
kind: TerminatorKind::Call { call_source: CallSource::OverloadedOperator, .. },
..
}),
Some((method_did, method_substs)),
Some((method_did, method_args)),
) = (
&self.body[loan.reserve_location.block].terminator,
rustc_middle::util::find_self_call(
Expand All @@ -2689,7 +2689,7 @@ impl<'cx, 'tcx> MirBorrowckCtxt<'cx, 'tcx> {
if tcx.is_diagnostic_item(sym::deref_method, method_did) {
let deref_target =
tcx.get_diagnostic_item(sym::deref_target).and_then(|deref_target| {
Instance::resolve(tcx, self.param_env, deref_target, method_substs)
Instance::resolve(tcx, self.param_env, deref_target, method_args)
.transpose()
});
if let Some(Ok(instance)) = deref_target {
Expand Down Expand Up @@ -2856,11 +2856,11 @@ impl<'cx, 'tcx> MirBorrowckCtxt<'cx, 'tcx> {
if is_closure {
None
} else {
let ty = self.infcx.tcx.type_of(self.mir_def_id()).subst_identity();
let ty = self.infcx.tcx.type_of(self.mir_def_id()).instantiate_identity();
match ty.kind() {
ty::FnDef(_, _) | ty::FnPtr(_) => self.annotate_fn_sig(
self.mir_def_id(),
self.infcx.tcx.fn_sig(self.mir_def_id()).subst_identity(),
self.infcx.tcx.fn_sig(self.mir_def_id()).instantiate_identity(),
),
_ => None,
}
Expand Down Expand Up @@ -2902,7 +2902,7 @@ impl<'cx, 'tcx> MirBorrowckCtxt<'cx, 'tcx> {
);
// Check if our `target` was captured by a closure.
if let Rvalue::Aggregate(
box AggregateKind::Closure(def_id, substs),
box AggregateKind::Closure(def_id, args),
operands,
) = rvalue
{
Expand Down Expand Up @@ -2933,7 +2933,7 @@ impl<'cx, 'tcx> MirBorrowckCtxt<'cx, 'tcx> {
// into a place then we should annotate the closure in
// case it ends up being assigned into the return place.
annotated_closure =
self.annotate_fn_sig(def_id, substs.as_closure().sig());
self.annotate_fn_sig(def_id, args.as_closure().sig());
debug!(
"annotate_argument_and_return_for_borrow: \
annotated_closure={:?} assigned_from_local={:?} \
Expand Down
6 changes: 3 additions & 3 deletions compiler/rustc_borrowck/src/diagnostics/explain_borrow.rs
View file
Original file line number Diff line number Diff line change
Expand Up @@ -168,17 +168,17 @@ impl<'tcx> BorrowExplanation<'tcx> {
let local_decl = &body.local_decls[dropped_local];
let mut ty = local_decl.ty;
if local_decl.source_info.span.desugaring_kind() == Some(DesugaringKind::ForLoop) {
if let ty::Adt(adt, substs) = local_decl.ty.kind() {
if let ty::Adt(adt, args) = local_decl.ty.kind() {
if tcx.is_diagnostic_item(sym::Option, adt.did()) {
// in for loop desugaring, only look at the `Some(..)` inner type
ty = substs.type_at(0);
ty = args.type_at(0);
}
}
}
let (dtor_desc, type_desc) = match ty.kind() {
// If type is an ADT that implements Drop, then
// simplify output by reporting just the ADT name.
ty::Adt(adt, _substs) if adt.has_dtor(tcx) && !adt.is_box() => {
ty::Adt(adt, _args) if adt.has_dtor(tcx) && !adt.is_box() => {
("`Drop` code", format!("type `{}`", tcx.def_path_str(adt.did())))
}

Expand Down
20 changes: 10 additions & 10 deletions compiler/rustc_borrowck/src/diagnostics/mod.rs
View file
Original file line number Diff line number Diff line change
Expand Up @@ -732,18 +732,18 @@ impl<'tcx> BorrowedContentSource<'tcx> {

fn from_call(func: Ty<'tcx>, tcx: TyCtxt<'tcx>) -> Option<Self> {
match *func.kind() {
ty::FnDef(def_id, substs) => {
ty::FnDef(def_id, args) => {
let trait_id = tcx.trait_of_item(def_id)?;

let lang_items = tcx.lang_items();
if Some(trait_id) == lang_items.deref_trait()
|| Some(trait_id) == lang_items.deref_mut_trait()
{
Some(BorrowedContentSource::OverloadedDeref(substs.type_at(0)))
Some(BorrowedContentSource::OverloadedDeref(args.type_at(0)))
} else if Some(trait_id) == lang_items.index_trait()
|| Some(trait_id) == lang_items.index_mut_trait()
{
Some(BorrowedContentSource::OverloadedIndex(substs.type_at(0)))
Some(BorrowedContentSource::OverloadedIndex(args.type_at(0)))
} else {
None
}
Expand Down Expand Up @@ -847,7 +847,7 @@ impl<'cx, 'tcx> MirBorrowckCtxt<'cx, 'tcx> {
kind: TerminatorKind::Call { fn_span, call_source, .. }, ..
}) = &self.body[location.block].terminator
{
let Some((method_did, method_substs)) = rustc_middle::util::find_self_call(
let Some((method_did, method_args)) = rustc_middle::util::find_self_call(
self.infcx.tcx,
&self.body,
target_temp,
Expand All @@ -860,7 +860,7 @@ impl<'cx, 'tcx> MirBorrowckCtxt<'cx, 'tcx> {
self.infcx.tcx,
self.param_env,
method_did,
method_substs,
method_args,
*fn_span,
call_source.from_hir_call(),
Some(self.infcx.tcx.fn_arg_names(method_did)[0]),
Expand Down Expand Up @@ -1039,7 +1039,7 @@ impl<'cx, 'tcx> MirBorrowckCtxt<'cx, 'tcx> {
});
}
}
CallKind::Normal { self_arg, desugaring, method_did, method_substs } => {
CallKind::Normal { self_arg, desugaring, method_did, method_args } => {
let self_arg = self_arg.unwrap();
let tcx = self.infcx.tcx;
if let Some((CallDesugaringKind::ForLoopIntoIter, _)) = desugaring {
Expand Down Expand Up @@ -1106,13 +1106,13 @@ impl<'cx, 'tcx> MirBorrowckCtxt<'cx, 'tcx> {
// Erase and shadow everything that could be passed to the new infcx.
let ty = moved_place.ty(self.body, tcx).ty;

if let ty::Adt(def, substs) = ty.kind()
if let ty::Adt(def, args) = ty.kind()
&& Some(def.did()) == tcx.lang_items().pin_type()
&& let ty::Ref(_, _, hir::Mutability::Mut) = substs.type_at(0).kind()
&& let ty::Ref(_, _, hir::Mutability::Mut) = args.type_at(0).kind()
&& let self_ty = self.infcx.instantiate_binder_with_fresh_vars(
fn_call_span,
LateBoundRegionConversionTime::FnCall,
tcx.fn_sig(method_did).subst(tcx, method_substs).input(0),
tcx.fn_sig(method_did).instantiate(tcx, method_args).input(0),
)
&& self.infcx.can_eq(self.param_env, ty, self_ty)
{
Expand Down Expand Up @@ -1161,7 +1161,7 @@ impl<'cx, 'tcx> MirBorrowckCtxt<'cx, 'tcx> {
let parent_self_ty =
matches!(tcx.def_kind(parent_did), rustc_hir::def::DefKind::Impl { .. })
.then_some(parent_did)
.and_then(|did| match tcx.type_of(did).subst_identity().kind() {
.and_then(|did| match tcx.type_of(did).instantiate_identity().kind() {
ty::Adt(def, ..) => Some(def.did()),
_ => None,
});
Expand Down
4 changes: 2 additions & 2 deletions compiler/rustc_borrowck/src/diagnostics/move_errors.rs
View file
Original file line number Diff line number Diff line change
Expand Up @@ -324,10 +324,10 @@ impl<'a, 'tcx> MirBorrowckCtxt<'a, 'tcx> {
ty::Array(..) | ty::Slice(..) => {
self.cannot_move_out_of_interior_noncopy(span, ty, None)
}
ty::Closure(def_id, closure_substs)
ty::Closure(def_id, closure_args)
if def_id.as_local() == Some(self.mir_def_id()) && upvar_field.is_some() =>
{
let closure_kind_ty = closure_substs.as_closure().kind_ty();
let closure_kind_ty = closure_args.as_closure().kind_ty();
let closure_kind = match closure_kind_ty.to_opt_closure_kind() {
Some(kind @ (ty::ClosureKind::Fn | ty::ClosureKind::FnMut)) => kind,
Some(ty::ClosureKind::FnOnce) => {
Expand Down
35 changes: 17 additions & 18 deletions compiler/rustc_borrowck/src/diagnostics/region_errors.rs
View file
Original file line number Diff line number Diff line change
Expand Up @@ -22,7 +22,7 @@ use rustc_infer::infer::{
};
use rustc_middle::hir::place::PlaceBase;
use rustc_middle::mir::{ConstraintCategory, ReturnConstraint};
use rustc_middle::ty::subst::InternalSubsts;
use rustc_middle::ty::GenericArgs;
use rustc_middle::ty::TypeVisitor;
use rustc_middle::ty::{self, RegionVid, Ty};
use rustc_middle::ty::{Region, TyCtxt};
Expand Down Expand Up @@ -183,9 +183,9 @@ impl<'a, 'tcx> MirBorrowckCtxt<'a, 'tcx> {
fn is_closure_fn_mut(&self, fr: RegionVid) -> bool {
if let Some(ty::ReFree(free_region)) = self.to_error_region(fr).as_deref()
&& let ty::BoundRegionKind::BrEnv = free_region.bound_region
&& let DefiningTy::Closure(_, substs) = self.regioncx.universal_regions().defining_ty
&& let DefiningTy::Closure(_, args) = self.regioncx.universal_regions().defining_ty
{
return substs.as_closure().kind() == ty::ClosureKind::FnMut;
return args.as_closure().kind() == ty::ClosureKind::FnMut;
}

false
Expand Down Expand Up @@ -502,12 +502,12 @@ impl<'a, 'tcx> MirBorrowckCtxt<'a, 'tcx> {
.to_string(),
)
}
ty::Adt(adt, substs) => {
let generic_arg = substs[param_index as usize];
let identity_substs =
InternalSubsts::identity_for_item(self.infcx.tcx, adt.did());
let base_ty = Ty::new_adt(self.infcx.tcx, *adt, identity_substs);
let base_generic_arg = identity_substs[param_index as usize];
ty::Adt(adt, args) => {
let generic_arg = args[param_index as usize];
let identity_args =
GenericArgs::identity_for_item(self.infcx.tcx, adt.did());
let base_ty = Ty::new_adt(self.infcx.tcx, *adt, identity_args);
let base_generic_arg = identity_args[param_index as usize];
let adt_desc = adt.descr();

let desc = format!(
Expand All @@ -520,12 +520,11 @@ impl<'a, 'tcx> MirBorrowckCtxt<'a, 'tcx> {
}
ty::FnDef(def_id, _) => {
let name = self.infcx.tcx.item_name(*def_id);
let identity_substs =
InternalSubsts::identity_for_item(self.infcx.tcx, *def_id);
let identity_args = GenericArgs::identity_for_item(self.infcx.tcx, *def_id);
let desc = format!("a function pointer to `{name}`");
let note = format!(
"the function `{name}` is invariant over the parameter `{}`",
identity_substs[param_index as usize]
identity_args[param_index as usize]
);
(desc, note)
}
Expand Down Expand Up @@ -573,7 +572,7 @@ impl<'a, 'tcx> MirBorrowckCtxt<'a, 'tcx> {

let mut output_ty = self.regioncx.universal_regions().unnormalized_output_ty;
if let ty::Alias(ty::Opaque, ty::AliasTy { def_id, .. }) = *output_ty.kind() {
output_ty = self.infcx.tcx.type_of(def_id).subst_identity()
output_ty = self.infcx.tcx.type_of(def_id).instantiate_identity()
};

debug!("report_fnmut_error: output_ty={:?}", output_ty);
Expand Down Expand Up @@ -899,14 +898,14 @@ impl<'a, 'tcx> MirBorrowckCtxt<'a, 'tcx> {
let tcx = self.infcx.tcx;

let instance = if let ConstraintCategory::CallArgument(Some(func_ty)) = category {
let (fn_did, substs) = match func_ty.kind() {
ty::FnDef(fn_did, substs) => (fn_did, substs),
let (fn_did, args) = match func_ty.kind() {
ty::FnDef(fn_did, args) => (fn_did, args),
_ => return,
};
debug!(?fn_did, ?substs);
debug!(?fn_did, ?args);

// Only suggest this on function calls, not closures
let ty = tcx.type_of(fn_did).subst_identity();
let ty = tcx.type_of(fn_did).instantiate_identity();
debug!("ty: {:?}, ty.kind: {:?}", ty, ty.kind());
if let ty::Closure(_, _) = ty.kind() {
return;
Expand All @@ -916,7 +915,7 @@ impl<'a, 'tcx> MirBorrowckCtxt<'a, 'tcx> {
tcx,
self.param_env,
*fn_did,
self.infcx.resolve_vars_if_possible(substs),
self.infcx.resolve_vars_if_possible(args),
) {
instance
} else {
Expand Down
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