Trait rustc_codegen_ssa::traits::consts::ConstMethods
source · pub trait ConstMethods<'tcx>: BackendTypes {
Show 23 methods
// Required methods
fn const_null(&self, t: Self::Type) -> Self::Value;
fn const_undef(&self, t: Self::Type) -> Self::Value;
fn const_poison(&self, t: Self::Type) -> Self::Value;
fn const_int(&self, t: Self::Type, i: i64) -> Self::Value;
fn const_uint(&self, t: Self::Type, i: u64) -> Self::Value;
fn const_uint_big(&self, t: Self::Type, u: u128) -> Self::Value;
fn const_bool(&self, val: bool) -> Self::Value;
fn const_i16(&self, i: i16) -> Self::Value;
fn const_i32(&self, i: i32) -> Self::Value;
fn const_u32(&self, i: u32) -> Self::Value;
fn const_u64(&self, i: u64) -> Self::Value;
fn const_u128(&self, i: u128) -> Self::Value;
fn const_usize(&self, i: u64) -> Self::Value;
fn const_u8(&self, i: u8) -> Self::Value;
fn const_real(&self, t: Self::Type, val: f64) -> Self::Value;
fn const_str(&self, s: &str) -> (Self::Value, Self::Value);
fn const_struct(&self, elts: &[Self::Value], packed: bool) -> Self::Value;
fn const_to_opt_uint(&self, v: Self::Value) -> Option<u64>;
fn const_to_opt_u128(&self, v: Self::Value, sign_ext: bool) -> Option<u128>;
fn const_data_from_alloc(&self, alloc: ConstAllocation<'tcx>) -> Self::Value;
fn scalar_to_backend(
&self,
cv: Scalar,
layout: Scalar,
llty: Self::Type
) -> Self::Value;
fn const_bitcast(&self, val: Self::Value, ty: Self::Type) -> Self::Value;
fn const_ptr_byte_offset(
&self,
val: Self::Value,
offset: Size
) -> Self::Value;
}
Required Methods§
fn const_null(&self, t: Self::Type) -> Self::Value
sourcefn const_undef(&self, t: Self::Type) -> Self::Value
fn const_undef(&self, t: Self::Type) -> Self::Value
Generate an uninitialized value (matching uninitialized memory in MIR). Whether memory is initialized or not is tracked byte-for-byte.
sourcefn const_poison(&self, t: Self::Type) -> Self::Value
fn const_poison(&self, t: Self::Type) -> Self::Value
Generate a fake value. Poison always affects the entire value, even if just a single byte is
poison. This can only be used in codepaths that are already UB, i.e., UB-free Rust code
(including code that e.g. copies uninit memory with MaybeUninit
) can never encounter a
poison value.