Enum cranelift_codegen::ir::ArgumentPurpose [−][src]
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.
Variants
A normal user program value passed to or from a function.
StructArgument(u32)
A C struct passed as argument.
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.
The link register.
Most RISC architectures implement calls by saving the return address in a designated
register rather than pushing it on the stack. This is represented with a Link
argument.
Similarly, some return instructions expect the return address in a register represented as
a Link
return value.
The frame pointer.
This indicates the frame pointer register which has a special meaning in some ABIs.
The frame pointer appears as an argument and as a return value since it is a callee-saved register.
A callee-saved register.
Some calling conventions have registers that must be saved by the callee. These registers
are represented as CalleeSaved
arguments and return values.
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.
A signature identifier.
This is a special-purpose argument used to identify the calling convention expected by the caller in an indirect call. The callee can verify that the expected signature ID matches.
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.
A callee TLS value.
In the Baldrdash-2020 calling convention, the stack upon entry to the callee contains the TLS-register values for the caller and the callee. This argument is used to provide the value for the callee.
A caller TLS value.
In the Baldrdash-2020 calling convention, the stack upon entry to the callee contains the TLS-register values for the caller and the callee. This argument is used to provide the value for the caller.
Trait Implementations
impl Clone for ArgumentPurpose
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fn clone(&self) -> ArgumentPurpose
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pub fn clone_from(&mut self, source: &Self)
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impl Copy for ArgumentPurpose
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impl Debug for ArgumentPurpose
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impl<'de> Deserialize<'de> for ArgumentPurpose
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fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error> where
__D: Deserializer<'de>,
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__D: Deserializer<'de>,
impl Display for ArgumentPurpose
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impl Eq for ArgumentPurpose
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impl FromStr for ArgumentPurpose
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type Err = ()
The associated error which can be returned from parsing.
fn from_str(s: &str) -> Result<Self, ()>
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impl Hash for ArgumentPurpose
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fn hash<__H: Hasher>(&self, state: &mut __H)
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pub fn hash_slice<H>(data: &[Self], state: &mut H) where
H: Hasher,
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H: Hasher,
impl PartialEq<ArgumentPurpose> for ArgumentPurpose
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fn eq(&self, other: &ArgumentPurpose) -> bool
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fn ne(&self, other: &ArgumentPurpose) -> bool
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impl Serialize for ArgumentPurpose
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fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error> where
__S: Serializer,
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__S: Serializer,
impl StructuralEq for ArgumentPurpose
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impl StructuralPartialEq for ArgumentPurpose
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Auto Trait Implementations
impl RefUnwindSafe for ArgumentPurpose
impl Send for ArgumentPurpose
impl Sync for ArgumentPurpose
impl Unpin for ArgumentPurpose
impl UnwindSafe for ArgumentPurpose
Blanket Implementations
impl<T> Any for T where
T: 'static + ?Sized,
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T: 'static + ?Sized,
impl<T> Borrow<T> for T where
T: ?Sized,
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T: ?Sized,
impl<T> BorrowMut<T> for T where
T: ?Sized,
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T: ?Sized,
pub fn borrow_mut(&mut self) -> &mut T
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impl<T> CallHasher for T where
T: Hash,
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T: Hash,
impl<T> DeserializeOwned for T where
T: for<'de> Deserialize<'de>,
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T: for<'de> Deserialize<'de>,
impl<Q, K> Equivalent<K> for Q where
K: Borrow<Q> + ?Sized,
Q: Eq + ?Sized,
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K: Borrow<Q> + ?Sized,
Q: Eq + ?Sized,
pub fn equivalent(&self, key: &K) -> bool
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impl<T> From<T> for T
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impl<T, U> Into<U> for T where
U: From<T>,
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U: From<T>,
impl<T> ToOwned for T where
T: Clone,
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T: Clone,
type Owned = T
The resulting type after obtaining ownership.
pub fn to_owned(&self) -> T
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pub fn clone_into(&self, target: &mut T)
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impl<T> ToString for T where
T: Display + ?Sized,
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T: Display + ?Sized,
impl<T, U> TryFrom<U> for T where
U: Into<T>,
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U: Into<T>,
type Error = Infallible
The type returned in the event of a conversion error.
pub fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>
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impl<T, U> TryInto<U> for T where
U: TryFrom<T>,
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U: TryFrom<T>,