Trait rustc_codegen_ssa::traits::consts::ConstMethods

pub trait ConstMethods<'tcx>: BackendTypes {
    // 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_i8(&self, i: i8) -> 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_ptr_byte_offset(
        &self,
        val: Self::Value,
        offset: Size,
    ) -> Self::Value;
}

Required Methods

fn const_null(&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.

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.

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_i8(&self, i: i8) -> 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_ptr_byte_offset(&self, val: Self::Value, offset: Size) -> Self::Value

Implementors