Enum rustc_codegen_llvm::abi::PassMode
source · pub(crate) enum PassMode {
Ignore,
Direct(ArgAttributes),
Pair(ArgAttributes, ArgAttributes),
Cast {
pad_i32: bool,
cast: Box<CastTarget>,
},
Indirect {
attrs: ArgAttributes,
meta_attrs: Option<ArgAttributes>,
on_stack: bool,
},
}
Variants§
Ignore
Ignore the argument.
The argument is either uninhabited or a ZST.
Direct(ArgAttributes)
Pass the argument directly.
The argument has a layout abi of Scalar
or Vector
.
Unfortunately due to past mistakes, in rare cases on wasm, it can also be Aggregate
.
This is bad since it leaks LLVM implementation details into the ABI.
(Also see https://github.com/rust-lang/rust/issues/115666.)
Pair(ArgAttributes, ArgAttributes)
Pass a pair’s elements directly in two arguments.
The argument has a layout abi of ScalarPair
.
Cast
Pass the argument after casting it. See the CastTarget
docs for details.
pad_i32
indicates if a Reg::i32()
dummy argument is emitted before the real argument.
Indirect
Pass the argument indirectly via a hidden pointer.
The meta_attrs
value, if any, is for the metadata (vtable or length) of an unsized
argument. (This is the only mode that supports unsized arguments.)
on_stack
defines that the value should be passed at a fixed stack offset in accordance to
the ABI rather than passed using a pointer. This corresponds to the byval
LLVM argument
attribute. The byval
argument will use a byte array with the same size as the Rust type
(which ensures that padding is preserved and that we do not rely on LLVM’s struct layout),
and will use the alignment specified in attrs.pointee_align
(if Some
) or the type’s
alignment (if None
). This means that the alignment will not always
match the Rust type’s alignment; see documentation of make_indirect_byval
for more info.
on_stack
cannot be true for unsized arguments, i.e., when meta_attrs
is Some
.
Implementations§
Trait Implementations§
source§impl<__CTX> HashStable<__CTX> for PassModewhere
__CTX: HashStableContext,
impl<__CTX> HashStable<__CTX> for PassModewhere
__CTX: HashStableContext,
fn hash_stable( &self, __hcx: &mut __CTX, __hasher: &mut StableHasher<SipHasher128>, )
impl Eq for PassMode
impl StructuralPartialEq for PassMode
Auto Trait Implementations§
impl Freeze for PassMode
impl RefUnwindSafe for PassMode
impl Send for PassMode
impl Sync for PassMode
impl Unpin for PassMode
impl UnwindSafe for PassMode
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<T, R> CollectAndApply<T, R> for T
impl<T, R> CollectAndApply<T, R> for T
source§impl<Tcx, T> DepNodeParams<Tcx> for T
impl<Tcx, T> DepNodeParams<Tcx> for T
default fn fingerprint_style() -> FingerprintStyle
source§default fn to_fingerprint(&self, tcx: Tcx) -> Fingerprint
default fn to_fingerprint(&self, tcx: Tcx) -> Fingerprint
default fn to_debug_str(&self, _: Tcx) -> String
source§default fn recover(_: Tcx, _: &DepNode) -> Option<T>
default fn recover(_: Tcx, _: &DepNode) -> Option<T>
DepNode
,
something which is needed when forcing DepNode
s during red-green
evaluation. The query system will only call this method if
fingerprint_style()
is not FingerprintStyle::Opaque
.
It is always valid to return None
here, in which case incremental
compilation will treat the query as having changed instead of forcing it.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> Filterable for T
impl<T> Filterable for T
source§fn filterable(
self,
filter_name: &'static str,
) -> RequestFilterDataProvider<T, fn(_: DataRequest<'_>) -> bool>
fn filterable( self, filter_name: &'static str, ) -> RequestFilterDataProvider<T, fn(_: DataRequest<'_>) -> bool>
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<P> IntoQueryParam<P> for P
impl<P> IntoQueryParam<P> for P
fn into_query_param(self) -> P
source§impl<T> MaybeResult<T> for T
impl<T> MaybeResult<T> for T
source§impl<I, T, U> Upcast<I, U> for Twhere
U: UpcastFrom<I, T>,
impl<I, T, U> Upcast<I, U> for Twhere
U: UpcastFrom<I, T>,
source§impl<I, T> UpcastFrom<I, T> for T
impl<I, T> UpcastFrom<I, T> for T
fn upcast_from(from: T, _tcx: I) -> T
source§impl<Tcx, T> Value<Tcx> for Twhere
Tcx: DepContext,
impl<Tcx, T> Value<Tcx> for Twhere
Tcx: DepContext,
default fn from_cycle_error( tcx: Tcx, cycle_error: &CycleError, _guar: ErrorGuaranteed, ) -> T
source§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,
impl<T> ErasedDestructor for Twhere
T: 'static,
impl<T> MaybeSendSync for T
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: 40 bytes
Size for each variant:
Ignore
: 0 bytesDirect
: 23 bytesPair
: 39 bytesCast
: 15 bytesIndirect
: 39 bytes