pub enum UndefinedBehaviorInfo {
Show 28 variants Ub(String), Unreachable, BoundsCheckFailed { len: u64, index: u64, }, DivisionByZero, RemainderByZero, DivisionOverflow, RemainderOverflow, PointerArithOverflow, InvalidMeta(&'static str), UnterminatedCString(Pointer<AllocId>), PointerUseAfterFree(AllocId), PointerOutOfBounds { alloc_id: AllocId, alloc_size: Size, ptr_offset: i64, ptr_size: Size, msg: CheckInAllocMsg, }, DanglingIntPointer(u64, CheckInAllocMsg), AlignmentCheckFailed { required: Align, has: Align, }, WriteToReadOnly(AllocId), DerefFunctionPointer(AllocId), DerefVTablePointer(AllocId), ValidationFailure { path: Option<String>, msg: String, }, InvalidBool(u8), InvalidChar(u32), InvalidTag(Scalar<AllocId>), InvalidFunctionPointer(Pointer<AllocId>), InvalidVTablePointer(Pointer<AllocId>), InvalidStr(Utf8Error), InvalidUninitBytes(Option<(AllocId, UninitBytesAccess)>), DeadLocal, ScalarSizeMismatch(ScalarSizeMismatch), UninhabitedEnumVariantWritten,
}
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!

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Unreachable

Unreachable code was executed.

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BoundsCheckFailed

Fields

§len: u64
§index: u64

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

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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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InvalidMeta(&'static str)

Invalid metadata in a wide pointer (using str to avoid allocations).

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UnterminatedCString(Pointer<AllocId>)

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

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PointerUseAfterFree(AllocId)

Dereferencing a dangling pointer after it got freed.

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PointerOutOfBounds

Fields

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

Used a pointer outside the bounds it is valid for. (If ptr_size > 0, determines the size of the memory range that was expected to be in-bounds.)

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DanglingIntPointer(u64, CheckInAllocMsg)

Using an integer as a pointer in the wrong way.

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AlignmentCheckFailed

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§required: Align
§has: Align

Used a pointer with bad alignment.

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WriteToReadOnly(AllocId)

Writing to read-only memory.

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DerefFunctionPointer(AllocId)

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DerefVTablePointer(AllocId)

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ValidationFailure

Fields

§path: Option<String>

The “path” to the value in question, e.g. .0[5].field for a struct field in the 6th element of an array that is the first element of a tuple.

The value validity check found a problem. Should only be thrown by validity.rs and always point out which part of the value is the problem.

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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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InvalidStr(Utf8Error)

Using a string that is not valid UTF-8,

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InvalidUninitBytes(Option<(AllocId, UninitBytesAccess)>)

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

A discriminant of an uninhabited enum variant is written.

Auto Trait Implementations§

Blanket Implementations§

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impl<T> Any for Twhere 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 Twhere T: ?Sized,

const: unstable · source§

fn borrow(&self) -> &T

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

const: unstable · source§

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

Mutably borrows from an owned value. Read more
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impl<T> From<T> for T

const: unstable · source§

fn from(t: T) -> T

Returns the argument unchanged.

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impl<T, U> Into<U> for Twhere U: From<T>,

const: unstable · source§

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> ToString for Twhere T: Display + ?Sized,

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default fn to_string(&self) -> String

Converts the given value to a String. Read more
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impl<T, U> TryFrom<U> for Twhere U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
const: unstable · source§

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 Twhere U: TryFrom<T>,

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

The type returned in the event of a conversion error.
const: unstable · source§

fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.

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: 56 bytes

Size for each variant:

  • Ub: 31 bytes
  • Unreachable: 0 bytes
  • BoundsCheckFailed: 23 bytes
  • DivisionByZero: 0 bytes
  • RemainderByZero: 0 bytes
  • DivisionOverflow: 0 bytes
  • RemainderOverflow: 0 bytes
  • PointerArithOverflow: 0 bytes
  • InvalidMeta: 23 bytes
  • UnterminatedCString: 23 bytes
  • PointerUseAfterFree: 15 bytes
  • PointerOutOfBounds: 39 bytes
  • DanglingIntPointer: 15 bytes
  • AlignmentCheckFailed: 2 bytes
  • WriteToReadOnly: 15 bytes
  • DerefFunctionPointer: 15 bytes
  • DerefVTablePointer: 15 bytes
  • ValidationFailure: 55 bytes
  • InvalidBool: 1 byte
  • InvalidChar: 7 bytes
  • InvalidTag: 31 bytes
  • InvalidFunctionPointer: 23 bytes
  • InvalidVTablePointer: 23 bytes
  • InvalidStr: 23 bytes
  • InvalidUninitBytes: 47 bytes
  • DeadLocal: 0 bytes
  • ScalarSizeMismatch: 23 bytes
  • UninhabitedEnumVariantWritten: 0 bytes