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add cast kind of from_exposed_addr (int-to-ptr casts)

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This commit is contained in:
Ralf Jung
2022-06-02 09:05:37 -04:00
parent 5e6bb83268
commit fafccdced3
10 changed files with 93 additions and 39 deletions
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18
compiler/rustc_const_eval/src/transform/check_consts/check.rs
View File

@@ -519,32 +519,30 @@ impl<'tcx> Visitor<'tcx> for Checker<'_, 'tcx> {
}
}
Rvalue::Cast(
CastKind::Pointer(PointerCast::MutToConstPointer | PointerCast::ArrayToPointer),
_,
_,
) => {}
Rvalue::Cast(
CastKind::Pointer(
PointerCast::UnsafeFnPointer
PointerCast::MutToConstPointer
| PointerCast::ArrayToPointer
| PointerCast::UnsafeFnPointer
| PointerCast::ClosureFnPointer(_)
| PointerCast::ReifyFnPointer,
),
_,
_,
) => {
// Nothing to do here. Function pointer casts are allowed now.
// These are all okay; they only change the type, not the data.
}
Rvalue::Cast(CastKind::Pointer(PointerCast::Unsize), _, _) => {
// Nothing to check here (`check_local_or_return_ty` ensures no trait objects occur
// in the type of any local, which also excludes casts).
// Unsizing is implemented for CTFE.
}
Rvalue::Cast(CastKind::PointerExposeAddress, _, _) => {
self.check_op(ops::RawPtrToIntCast);
}
Rvalue::Cast(CastKind::PointerFromExposedAddress, _, _) => {
// Since no pointer can ever get exposed (rejected above), this is easy to support.
}
Rvalue::Cast(CastKind::Misc, _, _) => {}

3
compiler/rustc_const_eval/src/transform/promote_consts.rs
View File

@@ -504,7 +504,8 @@ impl<'tcx> Validator<'_, 'tcx> {
// ptr-to-int casts are not possible in consts and thus not promotable
Rvalue::Cast(CastKind::PointerExposeAddress, _, _) => return Err(Unpromotable),
// int-to-ptr casts are fine, they just use the integer value at pointer type.
// all ohter casts including int-to-ptr casts are fine, they just use the integer value
// at pointer type.
Rvalue::Cast(_, operand, _) => {
self.validate_operand(operand)?;
}