#[repr(i32)]
pub enum AllocationSemantics { Default, Immortal, Los, Code, ReadOnly, LargeCode, NonMoving, }
Expand description

Allocation semantics that MMTk provides. Each allocation request requires a desired semantic for the object to allocate.

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Default

The default semantic. This means there is no specific requirement for the allocation. The actual semantic of the default will depend on the GC plan in use.

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Immortal

Immortal objects will not be reclaimed. MMTk still traces immortal objects, but will not reclaim the objects even if they are dead.

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Los

Large objects. It is usually desirable to allocate large objects specially. Large objects are allocated with page granularity and will not be moved. Each plan provides max_non_los_default_alloc_bytes (see crate::plan::PlanConstraints), which defines a threshold for objects that can be allocated with the default semantic. Any object that is larger than the threshold must be allocated with the Los semantic. This semantic may get removed and MMTk will transparently allocate into large object space for large objects.

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Code

Code objects have execution permission. Note that this is a place holder for now. Currently all the memory MMTk allocates has execution permission.

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ReadOnly

Read-only objects cannot be mutated once it is initialized. Note that this is a place holder for now. It does not provide read only semantic.

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LargeCode

Los + Code.

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NonMoving

Non moving objects will not be moved by GC.

Trait Implementations§

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impl Clone for AllocationSemantics

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fn clone(&self) -> AllocationSemantics

Returns a copy of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl Debug for AllocationSemantics

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

Formats the value using the given formatter. Read more
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impl Enum for AllocationSemantics

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const LENGTH: usize = 7usize

Length of the enum.
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fn from_usize(value: usize) -> Self

Takes an usize, and returns an element matching into_usize function.
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fn into_usize(self) -> usize

Returns an unique identifier for a value within range of 0..Array::LENGTH.
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impl<V> EnumArray<V> for AllocationSemantics

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type Array = [V; 7]

Representation of an enum map for type V.
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impl PartialEq<AllocationSemantics> for AllocationSemantics

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fn eq(&self, other: &AllocationSemantics) -> bool

This method tests for self and other values to be equal, and is used by ==.
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fn ne(&self, other: &Rhs) -> bool

This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.
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impl Copy for AllocationSemantics

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impl Eq for AllocationSemantics

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impl StructuralEq for AllocationSemantics

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impl StructuralPartialEq for AllocationSemantics

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,

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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 Twhere 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> Downcast for Twhere T: Any,

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fn into_any(self: Box<T, Global>) -> Box<dyn Any + 'static, Global>

Convert Box<dyn Trait> (where Trait: Downcast) to Box<dyn Any>. Box<dyn Any> can then be further downcast into Box<ConcreteType> where ConcreteType implements Trait.
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fn into_any_rc(self: Rc<T>) -> Rc<dyn Any + 'static>

Convert Rc<Trait> (where Trait: Downcast) to Rc<Any>. Rc<Any> can then be further downcast into Rc<ConcreteType> where ConcreteType implements Trait.
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fn as_any(&self) -> &(dyn Any + 'static)

Convert &Trait (where Trait: Downcast) to &Any. This is needed since Rust cannot generate &Any’s vtable from &Trait’s.
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fn as_any_mut(&mut self) -> &mut (dyn Any + 'static)

Convert &mut Trait (where Trait: Downcast) to &Any. This is needed since Rust cannot generate &mut Any’s vtable from &mut Trait’s.
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impl<T> DowncastSync for Twhere T: Any + Send + Sync,

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fn into_any_arc(self: Arc<T>) -> Arc<dyn Any + Sync + Send + 'static>

Convert Arc<Trait> (where Trait: Downcast) to Arc<Any>. Arc<Any> can then be further downcast into Arc<ConcreteType> where ConcreteType implements Trait.
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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, U> Into<U> for Twhere 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> Pointable for T

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const ALIGN: usize = mem::align_of::<T>()

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> ToOwned for Twhere T: Clone,

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type Owned = T

The resulting type after obtaining ownership.
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fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
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fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. 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.
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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 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.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.