Enum cranelift_codegen::ir::ArgumentPurpose
source · [−]pub enum ArgumentPurpose {
Normal,
StructArgument(u32),
StructReturn,
VMContext,
SignatureId,
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.
Variants
Normal
A normal user program value passed to or from a function.
StructArgument(u32)
A C struct passed as argument.
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.
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.
SignatureId
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.
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
sourceimpl Clone for ArgumentPurpose
impl Clone for ArgumentPurpose
sourcefn clone(&self) -> ArgumentPurpose
fn clone(&self) -> ArgumentPurpose
Returns a copy of the value. Read more
1.0.0 · sourcefn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
Performs copy-assignment from source
. Read more
sourceimpl Debug for ArgumentPurpose
impl Debug for ArgumentPurpose
sourceimpl Display for ArgumentPurpose
impl Display for ArgumentPurpose
sourceimpl FromStr for ArgumentPurpose
impl FromStr for ArgumentPurpose
sourceimpl Hash for ArgumentPurpose
impl Hash for ArgumentPurpose
sourceimpl PartialEq<ArgumentPurpose> for ArgumentPurpose
impl PartialEq<ArgumentPurpose> for ArgumentPurpose
sourcefn eq(&self, other: &ArgumentPurpose) -> bool
fn eq(&self, other: &ArgumentPurpose) -> bool
This method tests for self
and other
values to be equal, and is used
by ==
. Read more
sourcefn ne(&self, other: &ArgumentPurpose) -> bool
fn ne(&self, other: &ArgumentPurpose) -> bool
This method tests for !=
.
impl Copy for ArgumentPurpose
impl Eq for ArgumentPurpose
impl StructuralEq for ArgumentPurpose
impl StructuralPartialEq for ArgumentPurpose
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
sourceimpl<T> BorrowMut<T> for T where
T: ?Sized,
impl<T> BorrowMut<T> for T where
T: ?Sized,
const: unstable · sourcefn borrow_mut(&mut self) -> &mut T
fn borrow_mut(&mut self) -> &mut T
Mutably borrows from an owned value. Read more
sourceimpl<Q, K> Equivalent<K> for Q where
Q: Eq + ?Sized,
K: Borrow<Q> + ?Sized,
impl<Q, K> Equivalent<K> for Q where
Q: Eq + ?Sized,
K: Borrow<Q> + ?Sized,
sourcefn equivalent(&self, key: &K) -> bool
fn equivalent(&self, key: &K) -> bool
Compare self to key
and return true
if they are equal.
sourceimpl<T> ToOwned for T where
T: Clone,
impl<T> ToOwned for T where
T: Clone,
type Owned = T
type Owned = T
The resulting type after obtaining ownership.
sourcefn clone_into(&self, target: &mut T)
fn clone_into(&self, target: &mut T)
toowned_clone_into
)Uses borrowed data to replace owned data, usually by cloning. Read more