Enum cranelift_codegen::ir::ArgumentPurpose

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pub enum ArgumentPurpose {
    Normal,
    StructArgument(u32),
    StructReturn,
    VMContext,
    StackLimit,
}
Expand description

The special purpose of a function argument.

Function arguments and return values are used to pass user program values between functions, but they are also used to represent special registers with significance to the ABI such as frame pointers and callee-saved registers.

The argument purpose is used to indicate any special meaning of an argument or return value.

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Normal

A normal user program value passed to or from a function.

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StructArgument(u32)

A C struct passed as argument.

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StructReturn

Struct return pointer.

When a function needs to return more data than will fit in registers, the caller passes a pointer to a memory location where the return value can be written. In some ABIs, this struct return pointer is passed in a specific register.

This argument kind can also appear as a return value for ABIs that require a function with a StructReturn pointer argument to also return that pointer in a register.

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VMContext

A VM context pointer.

This is a pointer to a context struct containing details about the current sandbox. It is used as a base pointer for vmctx global values.

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StackLimit

A stack limit pointer.

This is a pointer to a stack limit. It is used to check the current stack pointer against. Can only appear once in a signature.

Trait Implementations§

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impl Clone for ArgumentPurpose

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fn clone(&self) -> ArgumentPurpose

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 ArgumentPurpose

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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 Display for ArgumentPurpose

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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 FromStr for ArgumentPurpose

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type Err = ()

The associated error which can be returned from parsing.
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fn from_str(s: &str) -> Result<Self, ()>

Parses a string s to return a value of this type. Read more
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impl Hash for ArgumentPurpose

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fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher. Read more
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fn hash_slice<H>(data: &[Self], state: &mut H)
where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher. Read more
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impl PartialEq for ArgumentPurpose

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fn eq(&self, other: &ArgumentPurpose) -> 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 ArgumentPurpose

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impl Eq for ArgumentPurpose

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impl StructuralPartialEq for ArgumentPurpose

Auto Trait Implementations§

Blanket Implementations§

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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<Q, K> Equivalent<K> for Q
where Q: Eq + ?Sized, K: Borrow<Q> + ?Sized,

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fn equivalent(&self, key: &K) -> bool

Checks if this value is equivalent to the given key. Read more
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impl<Q, K> Equivalent<K> for Q
where Q: Eq + ?Sized, K: Borrow<Q> + ?Sized,

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fn equivalent(&self, key: &K) -> bool

Compare self to key and return true if they are equal.
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impl<Q, K> Equivalent<K> for Q
where Q: Eq + ?Sized, K: Borrow<Q> + ?Sized,

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fn equivalent(&self, key: &K) -> bool

Checks if this value is equivalent to the given key. 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, 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> ToOwned for T
where 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> ToString for T
where 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 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.