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reword Miri validity errors: undefined -> uninitialized

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This commit is contained in:
Ralf Jung 2020-04-15 12:18:20 +02:00
parent 351eefe93a
commit 9ee4d1aadc
3 changed files with 14 additions and 9 deletions
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17
src/librustc_mir/interpret/validity.rs
View file

@ -322,7 +322,11 @@ impl<'rt, 'mir, 'tcx, M: Machine<'mir, 'tcx>> ValidityVisitor<'rt, 'mir, 'tcx, M
let value = self.ecx.read_immediate(value)?;
// Handle wide pointers.
// Check metadata early, for better diagnostics
let place = try_validation!(self.ecx.ref_to_mplace(value), "undefined pointer", self.path);
let place = try_validation!(
self.ecx.ref_to_mplace(value),
format_args!("uninitialized {}", kind),
self.path
);
if place.layout.is_unsized() {
self.check_wide_ptr_meta(place.meta, place.layout)?;
}
@ -334,7 +338,7 @@ impl<'rt, 'mir, 'tcx, M: Machine<'mir, 'tcx>> ValidityVisitor<'rt, 'mir, 'tcx, M
format_args!("invalid {} metadata: {}", kind, msg),
self.path
),
_ => bug!("Unexpected error during ptr size_and_align_of: {}", err),
_ => bug!("unexpected error during ptr size_and_align_of: {}", err),
},
};
let (size, align) = size_and_align
@ -477,10 +481,11 @@ impl<'rt, 'mir, 'tcx, M: Machine<'mir, 'tcx>> ValidityVisitor<'rt, 'mir, 'tcx, M
}
ty::RawPtr(..) => {
// We are conservative with undef for integers, but try to
// actually enforce our current rules for raw pointers.
// actually enforce the strict rules for raw pointers (mostly because
// that lets us re-use `ref_to_mplace`).
let place = try_validation!(
self.ecx.ref_to_mplace(self.ecx.read_immediate(value)?),
"undefined pointer",
"uninitialized raw pointer",
self.path
);
if place.layout.is_unsized() {
@ -776,14 +781,14 @@ impl<'rt, 'mir, 'tcx, M: Machine<'mir, 'tcx>> ValueVisitor<'mir, 'tcx, M>
// For some errors we might be able to provide extra information
match err.kind {
err_ub!(InvalidUndefBytes(Some(ptr))) => {
// Some byte was undefined, determine which
// Some byte was uninitialized, determine which
// element that byte belongs to so we can
// provide an index.
let i = usize::try_from(ptr.offset.bytes() / layout.size.bytes())
.unwrap();
self.path.push(PathElem::ArrayElem(i));
throw_validation_failure!("undefined bytes", self.path)
throw_validation_failure!("uninitialized value", self.path)
}
// Other errors shouldn't be possible
_ => return Err(err),

4
src/test/ui/consts/const-eval/ub-wide-ptr.stderr
View file

@ -62,7 +62,7 @@ LL | |
LL | | let uninit_len = MaybeUninit::<usize> { uninit: () };
LL | | mem::transmute((42, uninit_len))
LL | | };
| |__^ type validation failed: encountered undefined pointer
| |__^ type validation failed: encountered uninitialized reference
|
= note: The rules on what exactly is undefined behavior aren't clear, so this check might be overzealous. Please open an issue on the rustc repository if you believe it should not be considered undefined behavior.
@ -130,7 +130,7 @@ LL | |
LL | | let uninit_len = MaybeUninit::<usize> { uninit: () };
LL | | mem::transmute((42, uninit_len))
LL | | };
| |__^ type validation failed: encountered undefined pointer
| |__^ type validation failed: encountered uninitialized raw pointer
|
= note: The rules on what exactly is undefined behavior aren't clear, so this check might be overzealous. Please open an issue on the rustc repository if you believe it should not be considered undefined behavior.

2
src/test/ui/consts/const-eval/union-ice.stderr
View file

@ -27,7 +27,7 @@ LL | | unsafe { UNION.field3 },
... |
LL | | a: 42,
LL | | };
| |__^ type validation failed: encountered undefined bytes at .b[1]
| |__^ type validation failed: encountered uninitialized value at .b[1]
|
= note: The rules on what exactly is undefined behavior aren't clear, so this check might be overzealous. Please open an issue on the rustc repository if you believe it should not be considered undefined behavior.