rustc_middle::mir::interpret::error

Enum UndefinedBehaviorInfo

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pub enum UndefinedBehaviorInfo<'tcx> {
Show 36 variants Ub(String), Custom(CustomSubdiagnostic<'tcx>), ValidationError(ValidationErrorInfo<'tcx>), Unreachable, BoundsCheckFailed { len: u64, index: u64, }, DivisionByZero, RemainderByZero, DivisionOverflow, RemainderOverflow, PointerArithOverflow, ArithOverflow { intrinsic: Symbol, }, ShiftOverflow { intrinsic: Symbol, shift_amount: Either<u128, i128>, }, InvalidMeta(InvalidMetaKind), UnterminatedCString(Pointer<AllocId>), PointerUseAfterFree(AllocId, CheckInAllocMsg), PointerOutOfBounds { alloc_id: AllocId, alloc_size: Size, ptr_offset: i64, inbounds_size: i64, msg: CheckInAllocMsg, }, DanglingIntPointer { addr: u64, inbounds_size: i64, msg: CheckInAllocMsg, }, AlignmentCheckFailed(Misalignment, CheckAlignMsg), WriteToReadOnly(AllocId), DerefFunctionPointer(AllocId), DerefVTablePointer(AllocId), InvalidBool(u8), InvalidChar(u32), InvalidTag(Scalar<AllocId>), InvalidFunctionPointer(Pointer<AllocId>), InvalidVTablePointer(Pointer<AllocId>), InvalidVTableTrait { vtable_dyn_type: &'tcx List<PolyExistentialPredicate<'tcx>>, expected_dyn_type: &'tcx List<PolyExistentialPredicate<'tcx>>, }, InvalidStr(Utf8Error), InvalidUninitBytes(Option<(AllocId, BadBytesAccess)>), DeadLocal, ScalarSizeMismatch(ScalarSizeMismatch), UninhabitedEnumVariantWritten(VariantIdx), UninhabitedEnumVariantRead(VariantIdx), InvalidNichedEnumVariantWritten { enum_ty: Ty<'tcx>, }, AbiMismatchArgument { caller_ty: Ty<'tcx>, callee_ty: Ty<'tcx>, }, AbiMismatchReturn { caller_ty: Ty<'tcx>, callee_ty: Ty<'tcx>, },
}
Expand description

Error information for when the program caused Undefined Behavior.

Variants§

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Ub(String)

Free-form case. Only for errors that are never caught! Used by miri

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Custom(CustomSubdiagnostic<'tcx>)

A custom (free-form) fluent-translated error, created by err_ub_custom!.

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ValidationError(ValidationErrorInfo<'tcx>)

Validation error.

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Unreachable

Unreachable code was executed.

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BoundsCheckFailed

A slice/array index projection went out-of-bounds.

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§len: u64
§index: u64
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DivisionByZero

Something was divided by 0 (x / 0).

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RemainderByZero

Something was “remainded” by 0 (x % 0).

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DivisionOverflow

Signed division overflowed (INT_MIN / -1).

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RemainderOverflow

Signed remainder overflowed (INT_MIN % -1).

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PointerArithOverflow

Overflowing inbounds pointer arithmetic.

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ArithOverflow

Overflow in arithmetic that may not overflow.

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§intrinsic: Symbol
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ShiftOverflow

Shift by too much.

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§intrinsic: Symbol
§shift_amount: Either<u128, i128>
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InvalidMeta(InvalidMetaKind)

Invalid metadata in a wide pointer

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UnterminatedCString(Pointer<AllocId>)

Reading a C string that does not end within its allocation.

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PointerUseAfterFree(AllocId, CheckInAllocMsg)

Using a pointer after it got freed.

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PointerOutOfBounds

Used a pointer outside the bounds it is valid for.

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§alloc_id: AllocId
§alloc_size: Size
§ptr_offset: i64
§inbounds_size: i64

The size of the memory range that was expected to be in-bounds.

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DanglingIntPointer

Using an integer as a pointer in the wrong way.

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§addr: u64
§inbounds_size: i64

The size of the memory range that was expected to be in-bounds (or 0 if we need an allocation but not any actual memory there, e.g. for function pointers).

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AlignmentCheckFailed(Misalignment, CheckAlignMsg)

Used a pointer with bad alignment.

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WriteToReadOnly(AllocId)

Writing to read-only memory.

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DerefFunctionPointer(AllocId)

Trying to access the data behind a function pointer.

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DerefVTablePointer(AllocId)

Trying to access the data behind a vtable pointer.

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InvalidBool(u8)

Using a non-boolean u8 as bool.

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InvalidChar(u32)

Using a non-character u32 as character.

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InvalidTag(Scalar<AllocId>)

The tag of an enum does not encode an actual discriminant.

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InvalidFunctionPointer(Pointer<AllocId>)

Using a pointer-not-to-a-function as function pointer.

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InvalidVTablePointer(Pointer<AllocId>)

Using a pointer-not-to-a-vtable as vtable pointer.

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InvalidVTableTrait

Using a vtable for the wrong trait.

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§vtable_dyn_type: &'tcx List<PolyExistentialPredicate<'tcx>>

The vtable that was actually referenced by the wide pointer metadata.

§expected_dyn_type: &'tcx List<PolyExistentialPredicate<'tcx>>

The vtable that was expected at the point in MIR that it was accessed.

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InvalidStr(Utf8Error)

Using a string that is not valid UTF-8,

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InvalidUninitBytes(Option<(AllocId, BadBytesAccess)>)

Using uninitialized data where it is not allowed.

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DeadLocal

Working with a local that is not currently live.

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ScalarSizeMismatch(ScalarSizeMismatch)

Data size is not equal to target size.

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UninhabitedEnumVariantWritten(VariantIdx)

A discriminant of an uninhabited enum variant is written.

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UninhabitedEnumVariantRead(VariantIdx)

An uninhabited enum variant is projected.

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InvalidNichedEnumVariantWritten

Trying to set discriminant to the niched variant, but the value does not match.

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§enum_ty: Ty<'tcx>
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AbiMismatchArgument

ABI-incompatible argument types.

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§caller_ty: Ty<'tcx>
§callee_ty: Ty<'tcx>
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AbiMismatchReturn

ABI-incompatible return types.

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§caller_ty: Ty<'tcx>
§callee_ty: Ty<'tcx>

Trait Implementations§

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impl<'tcx> Debug for UndefinedBehaviorInfo<'tcx>

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fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more

Auto Trait Implementations§

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impl<'tcx> !DynSend for UndefinedBehaviorInfo<'tcx>

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impl<'tcx> !DynSync for UndefinedBehaviorInfo<'tcx>

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impl<'tcx> Freeze for UndefinedBehaviorInfo<'tcx>

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impl<'tcx> !RefUnwindSafe for UndefinedBehaviorInfo<'tcx>

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impl<'tcx> !Send for UndefinedBehaviorInfo<'tcx>

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impl<'tcx> !Sync for UndefinedBehaviorInfo<'tcx>

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impl<'tcx> Unpin for UndefinedBehaviorInfo<'tcx>

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impl<'tcx> !UnwindSafe for UndefinedBehaviorInfo<'tcx>

Blanket Implementations§

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impl<T> Aligned for T

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const ALIGN: Alignment = _

Alignment of Self.
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impl<T> Any for T
where T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for T
where T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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impl<T, R> CollectAndApply<T, R> for T

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fn collect_and_apply<I, F>(iter: I, f: F) -> R
where I: Iterator<Item = T>, F: FnOnce(&[T]) -> R,

Equivalent to f(&iter.collect::<Vec<_>>()).

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type Output = R

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impl<T> Filterable for T

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fn filterable( self, filter_name: &'static str, ) -> RequestFilterDataProvider<T, fn(_: DataRequest<'_>) -> bool>

Creates a filterable data provider with the given name for debugging. Read more
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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T> Instrument for T

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fn instrument(self, span: Span) -> Instrumented<Self>

Instruments this type with the provided Span, returning an Instrumented wrapper. Read more
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fn in_current_span(self) -> Instrumented<Self>

Instruments this type with the current Span, returning an Instrumented wrapper. Read more
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impl<T, U> Into<U> for T
where U: From<T>,

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<T> IntoEither for T

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fn into_either(self, into_left: bool) -> Either<Self, Self>

Converts self into a Left variant of Either<Self, Self> if into_left is true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more
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fn into_either_with<F>(self, into_left: F) -> Either<Self, Self>
where F: FnOnce(&Self) -> bool,

Converts self into a Left variant of Either<Self, Self> if into_left(&self) returns true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more
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impl<P> IntoQueryParam<P> for P

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impl<T> MaybeResult<T> for T

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type Error = !

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fn from(_: Result<T, <T as MaybeResult<T>>::Error>) -> T

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fn to_result(self) -> Result<T, <T as MaybeResult<T>>::Error>

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impl<T> Pointable for T

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const ALIGN: usize = _

The alignment of pointer.
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type Init = T

The type for initializers.
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unsafe fn init(init: <T as Pointable>::Init) -> usize

Initializes a with the given initializer. Read more
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unsafe fn deref<'a>(ptr: usize) -> &'a T

Dereferences the given pointer. Read more
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unsafe fn deref_mut<'a>(ptr: usize) -> &'a mut T

Mutably dereferences the given pointer. Read more
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unsafe fn drop(ptr: usize)

Drops the object pointed to by the given pointer. Read more
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impl<T> Same for T

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type Output = T

Should always be Self
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impl<T, U> TryFrom<U> for T
where U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.
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impl<I, T, U> Upcast<I, U> for T
where U: UpcastFrom<I, T>,

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fn upcast(self, interner: I) -> U

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impl<I, T> UpcastFrom<I, T> for T

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fn upcast_from(from: T, _tcx: I) -> T

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impl<V, T> VZip<V> for T
where V: MultiLane<T>,

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fn vzip(self) -> V

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impl<Tcx, T> Value<Tcx> for T
where Tcx: DepContext,

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default fn from_cycle_error( tcx: Tcx, cycle_error: &CycleError, _guar: ErrorGuaranteed, ) -> T

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impl<T> WithSubscriber for T

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fn with_subscriber<S>(self, subscriber: S) -> WithDispatch<Self>
where S: Into<Dispatch>,

Attaches the provided Subscriber to this type, returning a WithDispatch wrapper. Read more
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fn with_current_subscriber(self) -> WithDispatch<Self>

Attaches the current default Subscriber to this type, returning a WithDispatch wrapper. Read more
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impl<'a, T> Captures<'a> for T
where T: ?Sized,

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impl<T> ErasedDestructor for T
where T: 'static,

Layout§

Note: Most layout information is completely unstable and may even differ between compilations. The only exception is types with certain repr(...) attributes. Please see the Rust Reference's “Type Layout” chapter for details on type layout guarantees.

Size: 112 bytes

Size for each variant:

  • Ub: 24 bytes
  • Custom: 24 bytes
  • ValidationError: 112 bytes
  • Unreachable: 0 bytes
  • BoundsCheckFailed: 16 bytes
  • DivisionByZero: 0 bytes
  • RemainderByZero: 0 bytes
  • DivisionOverflow: 0 bytes
  • RemainderOverflow: 0 bytes
  • PointerArithOverflow: 0 bytes
  • ArithOverflow: 4 bytes
  • ShiftOverflow: 48 bytes
  • InvalidMeta: 1 byte
  • UnterminatedCString: 16 bytes
  • PointerUseAfterFree: 16 bytes
  • PointerOutOfBounds: 40 bytes
  • DanglingIntPointer: 24 bytes
  • AlignmentCheckFailed: 3 bytes
  • WriteToReadOnly: 8 bytes
  • DerefFunctionPointer: 8 bytes
  • DerefVTablePointer: 8 bytes
  • InvalidBool: 1 byte
  • InvalidChar: 4 bytes
  • InvalidTag: 24 bytes
  • InvalidFunctionPointer: 16 bytes
  • InvalidVTablePointer: 16 bytes
  • InvalidVTableTrait: 16 bytes
  • InvalidStr: 16 bytes
  • InvalidUninitBytes: 40 bytes
  • DeadLocal: 0 bytes
  • ScalarSizeMismatch: 16 bytes
  • UninhabitedEnumVariantWritten: 4 bytes
  • UninhabitedEnumVariantRead: 4 bytes
  • InvalidNichedEnumVariantWritten: 8 bytes
  • AbiMismatchArgument: 16 bytes
  • AbiMismatchReturn: 16 bytes