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Rollup merge of #103122 - ouz-a:mir-technical-debt, r=oli-obk

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Remove misc_cast and validate types when casting

Continuing our work in #102675

r? ````@oli-obk````
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Dylan DPC 2022-10-25 14:43:14 +05:30 • committed by GitHub
commit 8ba2a651fb
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3 changed files with 66 additions and 28 deletions
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25
compiler/rustc_const_eval/src/transform/validate.rs
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@ -556,21 +556,36 @@ impl<'a, 'tcx> Visitor<'tcx> for TypeChecker<'a, 'tcx> {
check_kinds!(a, "Cannot shallow init type {:?}", ty::RawPtr(..));
}
Rvalue::Cast(kind, operand, target_type) => {
let op_ty = operand.ty(self.body, self.tcx);
match kind {
CastKind::DynStar => {
// FIXME(dyn-star): make sure nothing needs to be done here.
}
// Nothing to check here
// FIXME: Add Checks for these
CastKind::PointerFromExposedAddress
| CastKind::PointerExposeAddress
| CastKind::Pointer(_) => {}
_ => {
let op_ty = operand.ty(self.body, self.tcx);
if op_ty.is_enum() {
CastKind::IntToInt | CastKind::IntToFloat => {
let input_valid = op_ty.is_integral() || op_ty.is_char() || op_ty.is_bool();
let target_valid = target_type.is_numeric() || target_type.is_char();
if !input_valid || !target_valid {
self.fail(
location,
format!("Wrong cast kind {kind:?} for the type {op_ty}",),
);
}
}
CastKind::FnPtrToPtr | CastKind::PtrToPtr => {
if !(op_ty.is_any_ptr() && target_type.is_unsafe_ptr()) {
self.fail(location, "Can't cast {op_ty} into 'Ptr'");
}
}
CastKind::FloatToFloat | CastKind::FloatToInt => {
if !op_ty.is_floating_point() || !target_type.is_numeric() {
self.fail(
location,
format!(
"enum -> int casts should go through `Rvalue::Discriminant`: {operand:?}:{op_ty} as {target_type}",
"Trying to cast non 'Float' as {kind:?} into {target_type:?}"
),
);
}