Enum rustc_codegen_llvm::abi::PassMode
source · [−]pub enum PassMode {
Ignore,
Direct(ArgAttributes),
Pair(ArgAttributes, ArgAttributes),
Cast(Box<CastTarget, Global>, bool),
Indirect {
attrs: ArgAttributes,
extra_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
, Vector
or in rare cases Aggregate
.
Pair(ArgAttributes, ArgAttributes)
Pass a pair’s elements directly in two arguments.
The argument has a layout abi of ScalarPair
.
Cast(Box<CastTarget, Global>, bool)
Pass the argument after casting it, to either a single uniform or a
pair of registers. The bool indicates if a Reg::i32()
dummy argument
is emitted before the real argument.
Indirect
Pass the argument indirectly via a hidden pointer.
The extra_attrs
value, if any, is for the extra data (vtable or length)
which indicates that it refers to an unsized rvalue.
on_stack
defines that the 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.
Auto Trait Implementations
impl RefUnwindSafe for PassMode
impl Send for PassMode
impl Sync for PassMode
impl Unpin for PassMode
impl UnwindSafe for PassMode
Blanket Implementations
sourceimpl<T> BorrowMut<T> for Twhere
T: ?Sized,
impl<T> BorrowMut<T> for Twhere
T: ?Sized,
const: unstable · sourcefn borrow_mut(&mut self) -> &mut T
fn borrow_mut(&mut self) -> &mut 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