Struct rustc_abi::ReprOptions
source · pub struct ReprOptions {
pub int: Option<IntegerType>,
pub align: Option<Align>,
pub pack: Option<Align>,
pub flags: ReprFlags,
pub field_shuffle_seed: u64,
}
Expand description
Represents the repr options provided by the user.
Fields§
§int: Option<IntegerType>
§align: Option<Align>
§pack: Option<Align>
§flags: ReprFlags
§field_shuffle_seed: u64
The seed to be used for randomizing a type’s layout
Note: This could technically be a u128
which would
be the “most accurate” hash as it’d encompass the item and crate
hash without loss, but it does pay the price of being larger.
Everything’s a tradeoff, a 64-bit seed should be sufficient for our
purposes (primarily -Z randomize-layout
)
Implementations§
source§impl ReprOptions
impl ReprOptions
pub fn simd(&self) -> bool
pub fn c(&self) -> bool
pub fn packed(&self) -> bool
pub fn transparent(&self) -> bool
pub fn linear(&self) -> bool
sourcepub fn discr_type(&self) -> IntegerType
pub fn discr_type(&self) -> IntegerType
Returns the discriminant type, given these repr
options.
This must only be called on enums!
sourcepub fn inhibit_enum_layout_opt(&self) -> bool
pub fn inhibit_enum_layout_opt(&self) -> bool
Returns true
if this #[repr()]
should inhabit “smart enum
layout” optimizations, such as representing Foo<&T>
as a
single pointer.
sourcepub fn inhibit_struct_field_reordering(&self) -> bool
pub fn inhibit_struct_field_reordering(&self) -> bool
Returns true
if this #[repr()]
guarantees a fixed field order,
e.g. repr(C)
or repr(<int>)
.
sourcepub fn can_randomize_type_layout(&self) -> bool
pub fn can_randomize_type_layout(&self) -> bool
Returns true
if this type is valid for reordering and -Z randomize-layout
was enabled for its declaration crate.
sourcepub fn inhibits_union_abi_opt(&self) -> bool
pub fn inhibits_union_abi_opt(&self) -> bool
Returns true
if this #[repr()]
should inhibit union ABI optimisations.
Trait Implementations§
source§impl Clone for ReprOptions
impl Clone for ReprOptions
source§fn clone(&self) -> ReprOptions
fn clone(&self) -> ReprOptions
1.0.0 · source§fn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
source
. Read moresource§impl Debug for ReprOptions
impl Debug for ReprOptions
source§impl<__D: Decoder> Decodable<__D> for ReprOptions
impl<__D: Decoder> Decodable<__D> for ReprOptions
source§impl Default for ReprOptions
impl Default for ReprOptions
source§fn default() -> ReprOptions
fn default() -> ReprOptions
source§impl<__E: Encoder> Encodable<__E> for ReprOptions
impl<__E: Encoder> Encodable<__E> for ReprOptions
source§impl<__CTX> HashStable<__CTX> for ReprOptionswhere
__CTX: HashStableContext,
impl<__CTX> HashStable<__CTX> for ReprOptionswhere
__CTX: HashStableContext,
fn hash_stable(&self, __hcx: &mut __CTX, __hasher: &mut StableHasher)
source§impl PartialEq for ReprOptions
impl PartialEq for ReprOptions
impl Copy for ReprOptions
impl Eq for ReprOptions
impl StructuralPartialEq for ReprOptions
Auto Trait Implementations§
impl Freeze for ReprOptions
impl RefUnwindSafe for ReprOptions
impl Send for ReprOptions
impl Sync for ReprOptions
impl Unpin for ReprOptions
impl UnwindSafe for ReprOptions
Blanket Implementations§
source§impl<T> BorrowMut<T> for Twhere
T: ?Sized,
impl<T> BorrowMut<T> for Twhere
T: ?Sized,
source§fn borrow_mut(&mut self) -> &mut T
fn borrow_mut(&mut self) -> &mut T
source§impl<T> CloneToUninit for Twhere
T: Clone,
impl<T> CloneToUninit for Twhere
T: Clone,
source§unsafe fn clone_to_uninit(&self, dst: *mut T)
unsafe fn clone_to_uninit(&self, dst: *mut T)
clone_to_uninit
)source§impl<Q, K> Equivalent<K> for Q
impl<Q, K> Equivalent<K> for Q
source§impl<Q, K> Equivalent<K> for Q
impl<Q, K> Equivalent<K> for Q
source§impl<Q, K> Equivalent<K> for Q
impl<Q, K> Equivalent<K> for Q
source§fn equivalent(&self, key: &K) -> bool
fn equivalent(&self, key: &K) -> bool
key
and return true
if they are equal.source§impl<T> Instrument for T
impl<T> Instrument for T
source§fn instrument(self, span: Span) -> Instrumented<Self>
fn instrument(self, span: Span) -> Instrumented<Self>
source§fn in_current_span(self) -> Instrumented<Self>
fn in_current_span(self) -> Instrumented<Self>
source§impl<T> IntoEither for T
impl<T> IntoEither for T
source§fn into_either(self, into_left: bool) -> Either<Self, Self>
fn into_either(self, into_left: bool) -> Either<Self, Self>
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 moresource§fn into_either_with<F>(self, into_left: F) -> Either<Self, Self>
fn into_either_with<F>(self, into_left: F) -> Either<Self, Self>
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 moresource§impl<T> WithSubscriber for T
impl<T> WithSubscriber for T
source§fn with_subscriber<S>(self, subscriber: S) -> WithDispatch<Self>
fn with_subscriber<S>(self, subscriber: S) -> WithDispatch<Self>
source§fn with_current_subscriber(self) -> WithDispatch<Self>
fn with_current_subscriber(self) -> WithDispatch<Self>
impl<'a, T> Captures<'a> for Twhere
T: ?Sized,
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: 16 bytes