use super::BackendTypes;
use crate::mir::place::PlaceRef;
use rustc_middle::mir::interpret::{Allocation, Scalar};
use rustc_middle::ty::layout::TyAndLayout;
use rustc_span::Symbol;
use rustc_target::abi::{self, Size};

pub trait ConstMethods<'tcx>: BackendTypes {
    // Constant constructors
    fn const_null(&self, t: Self::Type) -> Self::Value;
    fn const_undef(&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_i32(&self, i: i32) -> Self::Value;
    fn const_u32(&self, i: u32) -> Self::Value;
    fn const_u64(&self, i: u64) -> 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: Symbol) -> (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 scalar_to_backend(&self, cv: Scalar, layout: &abi::Scalar, llty: Self::Type) -> Self::Value;
    fn from_const_alloc(
        &self,
        layout: TyAndLayout<'tcx>,
        alloc: &Allocation,
        offset: Size,
    ) -> PlaceRef<'tcx, Self::Value>;

    fn const_ptrcast(&self, val: Self::Value, ty: Self::Type) -> Self::Value;
}
