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Outline SubstFolder bug reporting code paths

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Bug reporting macro `span_bug!` generates quite a bit of code,
we don't expect to execute. Outline it into a separate function.
This commit is contained in:
Tomasz Miąsko 2022-07-15 00:00:00 +00:00
parent 880bde0ced
commit e497fb19b0
1 changed files with 70 additions and 55 deletions
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125
compiler/rustc_middle/src/ty/subst.rs
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@ -11,7 +11,6 @@ use rustc_data_structures::intern::{Interned, WithStableHash};
use rustc_hir::def_id::DefId;
use rustc_macros::HashStable;
use rustc_serialize::{self, Decodable, Encodable};
use rustc_span::DUMMY_SP;
use smallvec::SmallVec;
use core::intrinsics;
@ -541,6 +540,16 @@ impl<'a, 'tcx> TypeFolder<'tcx> for SubstFolder<'a, 'tcx> {
}
fn fold_region(&mut self, r: ty::Region<'tcx>) -> ty::Region<'tcx> {
#[cold]
#[inline(never)]
fn region_param_out_of_range(data: ty::EarlyBoundRegion) -> ! {
bug!(
"Region parameter out of range when substituting in region {} (index={})",
data.name,
data.index
)
}
// Note: This routine only handles regions that are bound on
// type declarations and other outer declarations, not those
// bound in *fn types*. Region substitution of the bound
@ -551,14 +560,7 @@ impl<'a, 'tcx> TypeFolder<'tcx> for SubstFolder<'a, 'tcx> {
let rk = self.substs.get(data.index as usize).map(|k| k.unpack());
match rk {
Some(GenericArgKind::Lifetime(lt)) => self.shift_region_through_binders(lt),
_ => {
let msg = format!(
"Region parameter out of range \
when substituting in region {} (index={})",
data.name, data.index
);
span_bug!(DUMMY_SP, "{}", msg);
}
_ => region_param_out_of_range(data),
}
}
_ => r,
@ -596,67 +598,80 @@ impl<'a, 'tcx> SubstFolder<'a, 'tcx> {
let opt_ty = self.substs.get(p.index as usize).map(|k| k.unpack());
let ty = match opt_ty {
Some(GenericArgKind::Type(ty)) => ty,
Some(kind) => {
span_bug!(
DUMMY_SP,
"expected type for `{:?}` ({:?}/{}) but found {:?} \
when substituting, substs={:?}",
p,
source_ty,
p.index,
kind,
self.substs,
);
}
None => {
span_bug!(
DUMMY_SP,
"type parameter `{:?}` ({:?}/{}) out of range \
when substituting, substs={:?}",
p,
source_ty,
p.index,
self.substs,
);
}
Some(kind) => self.type_param_expected(p, source_ty, kind),
None => self.type_param_out_of_range(p, source_ty),
};
self.shift_vars_through_binders(ty)
}
#[cold]
#[inline(never)]
fn type_param_expected(&self, p: ty::ParamTy, ty: Ty<'tcx>, kind: GenericArgKind<'tcx>) -> ! {
bug!(
"expected type for `{:?}` ({:?}/{}) but found {:?} when substituting, substs={:?}",
p,
ty,
p.index,
kind,
self.substs,
)
}
#[cold]
#[inline(never)]
fn type_param_out_of_range(&self, p: ty::ParamTy, ty: Ty<'tcx>) -> ! {
bug!(
"type parameter `{:?}` ({:?}/{}) out of range when substituting, substs={:?}",
p,
ty,
p.index,
self.substs,
)
}
fn const_for_param(&self, p: ParamConst, source_ct: ty::Const<'tcx>) -> ty::Const<'tcx> {
// Look up the const in the substitutions. It really should be in there.
let opt_ct = self.substs.get(p.index as usize).map(|k| k.unpack());
let ct = match opt_ct {
Some(GenericArgKind::Const(ct)) => ct,
Some(kind) => {
span_bug!(
DUMMY_SP,
"expected const for `{:?}` ({:?}/{}) but found {:?} \
when substituting substs={:?}",
p,
source_ct,
p.index,
kind,
self.substs,
);
}
None => {
span_bug!(
DUMMY_SP,
"const parameter `{:?}` ({:?}/{}) out of range \
when substituting substs={:?}",
p,
source_ct,
p.index,
self.substs,
);
}
Some(kind) => self.const_param_expected(p, source_ct, kind),
None => self.const_param_out_of_range(p, source_ct),
};
self.shift_vars_through_binders(ct)
}
#[cold]
#[inline(never)]
fn const_param_expected(
&self,
p: ty::ParamConst,
ct: ty::Const<'tcx>,
kind: GenericArgKind<'tcx>,
) -> ! {
bug!(
"expected const for `{:?}` ({:?}/{}) but found {:?} when substituting substs={:?}",
p,
ct,
p.index,
kind,
self.substs,
)
}
#[cold]
#[inline(never)]
fn const_param_out_of_range(&self, p: ty::ParamConst, ct: ty::Const<'tcx>) -> ! {
bug!(
"const parameter `{:?}` ({:?}/{}) out of range when substituting substs={:?}",
p,
ct,
p.index,
self.substs,
)
}
/// It is sometimes necessary to adjust the De Bruijn indices during substitution. This occurs
/// when we are substituting a type with escaping bound vars into a context where we have
/// passed through binders. That's quite a mouthful. Let's see an example: